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<!--
Copyright 2020 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<!--
This file is used to generate a comprehensive list of Media histograms
along with a detailed description for each histogram.
For best practices on writing histogram descriptions, see
https://chromium.googlesource.com/chromium/src.git/+/HEAD/tools/metrics/histograms/README.md
Please follow the instructions in the OWNERS file in this directory to find a
reviewer. If no OWNERS file exists, please consider signing up at
go/reviewing-metrics (Googlers only), as all subdirectories are expected to
have an OWNERS file. As a last resort you can send the CL to
chromium-metrics-reviews@google.com.
-->
<histogram-configuration>
<histograms>
<variants name="AudioAggregationDuration">
<variant name=".Intervals" summary="Whole intervals of 1000 callbacks"/>
<variant name=".Short" summary="Streams shorter than 1000 callbacks"/>
</variants>
<variants name="AudioLatencyTag">
<variant name="" summary="All latencies combined"/>
<variant name=".LatencyExactMs"/>
<variant name=".LatencyInteractive"/>
<variant name=".LatencyPlayback"/>
<variant name=".LatencyRtc"/>
<variant name=".LatencyUnknown"/>
</variants>
<variants name="CastStreamingSender">
<variant name="Audio"/>
<variant name="Remoting.Audio"/>
<variant name="Remoting.Video"/>
<variant name="Video"/>
</variants>
<variants name="DbOperation">
<variant name="Clear" summary="Remove all keys from the DB"/>
<variant name="Initialize" summary="Initialize the DB."/>
<variant name="Read" summary="Read an entry from the DB"/>
<variant name="Validate" summary="Check for DB entry corruption"/>
<variant name="Write" summary="Write an entry to the DB"/>
</variants>
<variants name="EmeApi">
<variant name="CloseSession"/>
<variant name="GenerateRequest"/>
<variant name="GetStatusForPolicy"/>
<variant name="LoadSession"/>
<variant name="RemoveSession"/>
<variant name="SetServerCertificate"/>
<variant name="UpdateSession"/>
</variants>
<variants name="FileOperation">
<variant name="DeleteFile"/>
<variant name="ReadFile"/>
<variant name="WriteFile"/>
</variants>
<variants name="IncognitoOrNormal">
<variant name="" summary="Normal or Incognito"/>
<variant name=".Incognito" summary="Incognito"/>
<variant name=".Normal" summary="Normal"/>
</variants>
<variants name="KeySystem">
<variant name="ClearKey" summary="Clear Key key system"/>
<variant name="Widevine" summary="Widevine key system"/>
</variants>
<variants name="KeySystemWithRobustness">
<variant name="ClearKey" summary="Clear Key key system"/>
<variant name="Widevine.HardwareSecure"
summary="Hardware secure Widevine key system"/>
<variant name="Widevine.SoftwareSecure"
summary="Software secure Widevine key system"/>
</variants>
<variants name="RendererType">
<variant name="MediaFoundationRenderer"/>
<variant name="RendererImpl"/>
</variants>
<variants name="ResolveOrReject">
<variant name="" summary="resolve"/>
<variant name=".Reject" summary="reject"/>
</variants>
<!-- The names should match media::GetCodecNameForUMA(). -->
<variants name="VideoCodec">
<variant name="AV1"/>
<variant name="DolbyVision"/>
<variant name="H264"/>
<variant name="HEVC"/>
<variant name="MPEG2"/>
<variant name="MPEG4"/>
<variant name="Theora"/>
<variant name="VC1"/>
<variant name="VP8"/>
<variant name="VP9"/>
</variants>
<histogram name="CastStreaming.Sender.Audio.NegotiatedCodec" enum="AudioCodec"
expires_after="2024-04-07">
<owner>jophba@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<summary>
Records which audio codec was negotiated during a mirroring session.
</summary>
</histogram>
<histogram name="CastStreaming.Sender.Video.Bitrate" units="kbps"
expires_after="2024-02-06">
<owner>jophba@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<summary>
Records the currently set video bit rate during a Cast Streaming mirroring
session. This metric is subsampled every 500 frames.
</summary>
</histogram>
<histogram name="CastStreaming.Sender.Video.NegotiatedCodec" enum="VideoCodec"
expires_after="2024-04-07">
<owner>jophba@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<summary>
Records which video codec was negotiated during a mirroring session.
</summary>
</histogram>
<histogram name="CastStreaming.Sender.{CastStreamingSender}.FrameDropped"
enum="CastStreamingFrameDropReason" expires_after="2024-02-06">
<owner>jophba@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<summary>
Records the reason when an frame is dropped during a Cast Streaming session.
</summary>
<token key="CastStreamingSender" variants="CastStreamingSender"/>
</histogram>
<histogram
name="CastStreaming.Sender.{CastStreamingSender}.PercentDroppedFrames"
units="%" expires_after="2024-02-06">
<owner>jophba@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<summary>
Records the total percentage of frames dropped for a given Cast Streaming
session.
</summary>
<token key="CastStreamingSender" variants="CastStreamingSender"/>
</histogram>
<histogram name="Media.AImageReaderGLOwner.AcquireImageResult"
enum="MediaStatus" expires_after="2023-11-12">
<owner>vikassoni@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Error codes to handle AImage and AImageReader api calls. This is recorded
when AImageReader acquireNextImage or acquireLatestImage is called and the
returned code is other than AMEDIA_OK. This histogram was enabled in the
past and became absolete on 2018-11-25.
</summary>
</histogram>
<histogram name="Media.AImageReaderGLOwner.HasFence" enum="Boolean"
expires_after="2023-10-22">
<owner>vasilyt@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Logs whether AImageReader provided an acquire fence in acquireNextImage or
acquireLatestImage. Logged once for each successfuly acquired frame.
</summary>
</histogram>
<histogram name="Media.Android.BecomingNoisy" enum="Boolean"
expires_after="2023-01-15">
<owner>liberato@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Android-specific metric. Occasionally, we cannot start a foreground service
when headphones are unplugged. This tracks how often that occurs, which is
one recorded boolean per &quot;user unplugs headphones while media is
playing&quot;. See https://crbug.com/1245017 for more details.
</summary>
</histogram>
<histogram name="Media.Android.GetColorSpaceError" enum="BooleanError"
expires_after="2023-06-25">
<owner>vasilyt@chromium.org</owner>
<owner>liberato@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Android: Whether we successfuly got ColorSpace from MediaCodec or not.
Recorded each time output format changes from MediaCodec.
</summary>
</histogram>
<histogram name="Media.Android.MediaPlayerSuccess" enum="MediaPlayerExitStatus"
expires_after="2023-11-12">
<owner>tguilbert@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>Android: Whether MediaPlayer exited without errors.</summary>
</histogram>
<histogram name="Media.Android.MediaPlayerWatchTime"
enum="MediaPlayerWatchTimeType" expires_after="2024-04-25">
<owner>sandersd@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Wall time of MediaPlayer playbacks. Each count represents one second of
media playback. Multiple MediaPlayer instances can together accumulate watch
time faster than real time.
</summary>
</histogram>
<histogram name="Media.Audible.CloseNewestToExitConcurrentPlayback"
enum="ExitConcurrentPlaybackContents" expires_after="2023-09-15">
<owner>evliu@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records when an audible tab is closed and we now only have one audible tab
open. Warning: this histogram was expired from 2019-05-30 to 4-18-22; data
may be missing.
</summary>
</histogram>
<histogram name="Media.Audible.ConcurrentTabsTime" units="ms"
expires_after="2023-09-15">
<owner>evliu@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records how long more than one tab is audible at the same time. The
concurrent tabs might change during this period. The time recorded starts
when the browser goes from one to two audbile tabs and stops when it is back
below two. Warning: this histogram was expired from 2020-09-05 to 4-18-22;
data may be missing.
</summary>
</histogram>
<histogram name="Media.Audible.ConcurrentTabsWhenStarting" units="units"
expires_after="2023-09-15">
<owner>evliu@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records how many tabs were audible when a new tab started to be audible.
Warning: this histogram was expired from 2020-09-05 to 4-18-22; data may be
missing.
</summary>
</histogram>
<histogram name="Media.Audible.MaxConcurrentTabsInSession" units="units"
expires_after="2023-09-15">
<owner>evliu@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records how many tabs are audible at the same time during the session. It is
recording the maximum audible tab count everytime it increases. In other
words, a session with N concurrent audible tabs will record entries from 1
through N exactly once. Warning: this histogram was expired from 2020-09-05
to 4-18-22; data may be missing.
</summary>
</histogram>
<histogram name="Media.Audio.Autoplay" enum="AutoplaySource"
expires_after="2023-09-15">
<owner>dalecurtis@chromium.org</owner>
<owner>evliu@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>Records the autoplay source of audios.</summary>
</histogram>
<histogram name="Media.Audio.Capture.DetectedMissingCallbacks"
enum="BooleanMissingCallbacks" expires_after="2023-11-12">
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Whether missing callbacks where detected during audio capture. Logged when
AudioInputDevice is stopped.
</summary>
</histogram>
<histogram name="Media.Audio.Capture.FramesProvided" units="frames"
expires_after="2023-10-08">
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The number of captured audio frames that is provided by the operating system
in each callback. Typically, Chrome will want to use a 10 ms buffer (e.g.
480 frames for a sample rate of 48 kHz), but the OS may decide to capture
e.g. 256 frames of audio at a time. If the desired frame size is used, the
emitted value is special-cased to be 0. This histogram then shows how
frequent it is that the desired number of frames is used and if not, the
number of frames used in practice. The number of frames per callback is
normally constant or very rarely changed throughout the lifetime of the
audio stream. The first value that differs from the desired value is stored
and logged when an audio input stream is closed. Any further differences
during the lifetime will be ignored.
</summary>
</histogram>
<histogram name="Media.Audio.Capture.InputStreamDuration" units="ms"
expires_after="2024-05-03">
<owner>olka@chromium.org</owner>
<owner>saza@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
This histogram measures the duration of every input stream, as seen from the
renderer. It counts from when it has been successfully started, until it is
stopped. Streams that fail to start are not logged.
</summary>
</histogram>
<histogram name="Media.Audio.Capture.LowLatencyCallbackError"
enum="BooleanError" expires_after="2023-11-05">
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
A boolean that reflects whether or not an error was reported during audio
capture for a low latency stream.
</summary>
</histogram>
<histogram
name="Media.Audio.Capture.Mac.MicSystemPermission.FixedTime.SinceFirstFailure"
units="ms" expires_after="2023-11-12">
<owner>toprice@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The time from the first microphone access failure due to blocked system
permission before the last browser restart to startup after browser restart.
Logged once at browser startup if the system permission then is allowed.
Warning: this histogram was expired from 2020-03-01 to 2022-03-09; data may
be missing.
</summary>
</histogram>
<histogram
name="Media.Audio.Capture.Mac.MicSystemPermission.FixedTime.SinceLastFailure"
units="ms" expires_after="2023-11-12">
<owner>toprice@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The time from the last microphone access failure due to blocked system
permission before the last browser restart to startup after browser restart.
Logged once at browser startup if the system permission then is allowed.
Warning: this histogram was expired from 2020-03-01 to 2022-03-09; data may
be missing.
</summary>
</histogram>
<histogram name="Media.Audio.Capture.Mac.MicSystemPermission.Startup"
enum="SystemMediaCapturePermission" expires_after="2023-11-12">
<owner>toprice@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The Mac system permission state for microphone. Logged once at browser
startup. For more information on the values, see
https://developer.apple.com/documentation/avfoundation/avauthorizationstatus.
Warning: this histogram was expired from 2020-03-01 to 2022-03-09; data may
be missing.
</summary>
</histogram>
<histogram
name="Media.Audio.Capture.Mac.MicSystemPermission.StartupAfterFailure"
enum="SystemMediaCapturePermission" expires_after="2023-11-12">
<owner>toprice@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The Mac system permission state for microphone. Logged once at browser
startup if there was a failure accessing the microphone due to blocked
system permission before the last browser restart. For more information on
the values, see
https://developer.apple.com/documentation/avfoundation/avauthorizationstatus.
Warning: this histogram was expired from 2020-03-01 to 2022-03-09; data may
be missing.
</summary>
</histogram>
<histogram name="Media.Audio.Capture.Mac.MicSystemPermission.UserMedia"
enum="SystemMediaCapturePermission" expires_after="2023-11-12">
<owner>toprice@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The Mac system permission state for microphone at the time of a user media
request. Logged when the system permission is checked. If the permission is
&quot;not determined&quot; this is logged, permission is requested, and the
resulting permission (from the user response) is also logged. For more
information on the values, see
https://developer.apple.com/documentation/avfoundation/avauthorizationstatus.
Warning: this histogram was expired from 2020-03-01 to 2022-03-09; data may
be missing.
</summary>
</histogram>
<histogram name="Media.Audio.Capture.ProcessingAudioFifo.MaxUsage"
units="buffers" expires_after="2023-10-08">
<owner>tguilbert@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Maximum size (in buffers) of the unprocessed data queue, reached over a
sampling interval (1000 callbacks). Not logged for streams received less
than 1000 callbacks.
</summary>
</histogram>
<histogram name="Media.Audio.Capture.ProcessingAudioFifo.Overruns"
units="count" expires_after="2023-08-08">
<owner>tguilbert@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Number of times over a sampling interval (1000 callbacks) a
ProcessingAudioFifo has overflowed and dropped buffers. Capped at 100 (1/10
of all callbacks). Not logged for streams received less than 1000 callbacks.
</summary>
</histogram>
<histogram name="Media.Audio.Capture.StreamCallbackError2"
enum="AudioCaptureDeviceError" expires_after="never">
<!-- expires-never: Audio pipeline health metric. -->
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
When AudioInputDevice is stopped, this stat is recorded with whether an
error callback was ever received over IPC, and in that case whether the
error occurred during or after stream creation.
</summary>
</histogram>
<histogram name="Media.Audio.Capture.Win.AbsTimestampDiffMs" units="ms"
expires_after="2024-05-25">
<owner>henrika@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The absolute time difference in milliseconds between a default QPC-based
timstamp and a timestamp from TimeTicks::Now(). By default, the difference
will be small and correspond to the size of the audio capture buffer which
is about 10 milliseconds. It can however be very large on some devices, e.g.
when using RDP. If the diffeence is larger than 500 milliseconds, so-called
fake audio capture timestamps (based on TimeTicks::Now()) will be utilized.
This value is logged once per audio input stream session at the first audio
callback.
</summary>
</histogram>
<histogram name="Media.Audio.Capture.Win.FakeTimestamps" enum="Boolean"
expires_after="2024-05-25">
<owner>henrika@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Logs whether audio capture timestamps on Windows are fake or not. By default
QPC-based timestamps provided by native audio APIs are utilized. In some
cases the QPC-based timestamps differ a lot compared with TimeTicks::Now()
timestamps and this can lead to issues (see http://crbug.com/1439283). If an
absolute difference larger than 500 msec between these two types of
timestamps is detected, we fall back to using TimeTicks::Now() and these
timestams are called fake timestamps. We expect that usage of fake
timestamps will be low. This value is logged once per audio input stream
session at the first audio callback.
</summary>
</histogram>
<histogram name="Media.Audio.Capture.Win.Glitches2" units="glitches"
expires_after="2023-11-05">
<owner>olka@chromium.org</owner>
<owner>henrika@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The number of glitches that were detected at the OS level while an audio
input stream was active. A glitch in this case corresponds to a certain
error code from the IAudioCaptureClient::GetBuffer() API:
AUDCLNT_BUFFERFLAGS_DATA_DISCONTINUITY. This value is logged every 1000 OS
callbacks on Windows.
</summary>
</histogram>
<histogram name="Media.Audio.Capture.Win.InitError" enum="Hresult"
expires_after="2023-11-12">
<owner>olka@chromium.org</owner>
<owner>tommi@chromium.org</owner>
<owner>guidou@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Error codes from IAudioClient::Initialize() in
WASAPIAudioInputStream::InitializeAudioEngine on Windows.
</summary>
</histogram>
<histogram name="Media.Audio.Capture.Win.InitError.FormatRelated"
enum="AudioStreamFormatRelatedInitError" expires_after="2023-10-14">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Errors from IAudioClient::Initialize() in
WASAPIAudioInputStream::InitializeAudioEngine on Windows that are related to
the audio format. Each error is split by whether format conversion was used
or not. Warning: this histogram was expired from 2022-10-17 to 2022-10-18;
data may be missing.
</summary>
</histogram>
<histogram name="Media.Audio.Capture.Win.Open" enum="AudioStreamOpenResult"
expires_after="2023-11-05">
<owner>gudiou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Success/error cases for opening an audio input stream on Windows.
</summary>
</histogram>
<histogram name="Media.Audio.CoreAudioDispatchOverrideInitResult"
enum="CoreAudioDispatchOverrideInitResult" expires_after="2023-10-01">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Tracks support and initialization success/failure of the CoreAudio dispatch
override hotfix. Logged during initialization of AudioManagerMac. The fix is
not supported on macOS earlier than version 10.10. Warning: this histogram
was expired from 2022-10-01 to 2022-12-08; data may be missing.
</summary>
</histogram>
<histogram name="Media.Audio.CoreAudioDispatchOverrideLookupEvent"
enum="CoreAudioDispatchOverrideLookupEvent" expires_after="2023-10-14">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Logged whenever the CoreAudio dispatch override hotfix needs to look up the
calling function using dladdr(). Once ResumeIO and PauseIO have been
identified, no more lookups should be performed during the session. Warning:
this histogram was expired from 2022-10-09 to 2022-10-18; data may be
missing.
</summary>
</histogram>
<histogram name="Media.Audio.CrasInputStreamNotifyStreamError"
units="errorcode" expires_after="2023-10-08">
<owner>peah@chromium.org</owner>
<owner>hychao@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Error codes reported by the NotifyStreamError function in CrasInputStream.
</summary>
</histogram>
<histogram name="Media.Audio.CrasInputStreamOpenSuccess"
enum="CrasInputStreamOpenSuccess" expires_after="2023-10-08">
<owner>peah@chromium.org</owner>
<owner>hychao@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Logged at each call to CrasInputStream::Open to indicate any errors.
</summary>
</histogram>
<histogram name="Media.Audio.CrasInputStreamStartSuccess"
enum="CrasInputStreamStartSuccess" expires_after="2023-10-08">
<owner>peah@chromium.org</owner>
<owner>hychao@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Logged at each call to CrasInputStream::Start to indicate any errors.
</summary>
</histogram>
<histogram name="Media.Audio.CrasUnifiedStreamNotifyStreamError"
units="errorcode" expires_after="2023-10-01">
<owner>peah@chromium.org</owner>
<owner>hychao@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Error codes reported by the NotifyStreamError function in CrasUnifiedStream.
</summary>
</histogram>
<histogram name="Media.Audio.CrasUnifiedStreamOpenSuccess"
enum="CrasUnifiedStreamOpenSuccess" expires_after="2023-10-01">
<owner>peah@chromium.org</owner>
<owner>hychao@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Logged at each call to CrasUnifiedStream::Open to indicate any errors.
</summary>
</histogram>
<histogram name="Media.Audio.CrasUnifiedStreamStartSuccess"
enum="CrasUnifiedStreamStartSuccess" expires_after="2023-10-01">
<owner>peah@chromium.org</owner>
<owner>hychao@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Logged at each call to CrasUnifiedStream::Start to indicate any errors.
</summary>
</histogram>
<histogram name="Media.Audio.InputStartupSuccessMac" enum="BooleanSuccess"
expires_after="2023-10-01">
<owner>henrika@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Indicates if audio capturing did start after stream startup was requested.
Sampled once, a few seconds after a stream has been asked to start.
</summary>
</histogram>
<histogram name="Media.Audio.InputVolumeStartsAtZeroWin"
enum="BooleanVolumeZero" expires_after="2023-10-15">
<owner>henrika@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Indicates if the volume level of the audio session is set to zero when the
input audio session starts. Sampled once when the stream starts but only on
Windows platforms. See http://crbug.com/1014443. Warning: this histogram was
expired from 2022-10-09 to 2022-12-07; data may be missing.
</summary>
</histogram>
<histogram name="Media.Audio.Mac.AggregateDeviceCompositionPropertyIsNull"
enum="Boolean" expires_after="2024-03-31">
<owner>agpalak@chromium.org</owner>
<owner>dalecurtis@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Reports the number of occurences of null output dictionary when
AudioObjectGetPropertyData for kAudioAggregateDevicePropertyComposition is
called. This is equivalent to the number of crashes that were reported in
crbug.com/1428619.
</summary>
</histogram>
<histogram name="Media.Audio.Output.Win.{AudioOutputMethod}Error"
enum="Hresult" expires_after="M117">
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Errors from various methods on WASAPIAudioOutputStream. Recorded upon a
failure being returned from a call into WASAPI.
</summary>
<token key="AudioOutputMethod">
<variant name="Open"/>
<variant name="Render"/>
<variant name="Run"/>
<variant name="Start"/>
<variant name="Stop"/>
</token>
</histogram>
<histogram name="Media.Audio.OutputDeviceAuthorizationTime" units="ms"
expires_after="2023-11-12">
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Time delta between the moment output device authorization request is
received by the browser and the moment its processessing is finished (and
reply is to be sent back to the renderer if IPC is not closed yet).
</summary>
</histogram>
<histogram name="Media.Audio.OutputDeviceListener.Duration{Device}" units="ms"
expires_after="2023-10-05">
<owner>olka@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Duration of the interval when a listener listens to a specific output
device. Recorded when a listener chooses to listen to another output device,
or stops listening altogether.
</summary>
<token key="Device">
<variant name=".Default" summary="Default device"/>
<variant name=".NonDefault" summary="Non-default device"/>
</token>
</histogram>
<histogram name="Media.Audio.OutputDeviceMixer.MaxListenerCount{Device}"
units="listeners" expires_after="2023-10-05">
<owner>olka@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Maximum number of listeners receiving the reference output signal during
mixed playback. Recoreded when mixing stops (i.e. when all reference signal
listeners are gone.)
</summary>
<token key="Device">
<variant name="" summary="All"/>
<variant name=".Default" summary="Default device mixer"/>
<variant name=".NonDefault" summary="Non-default device mixer"/>
</token>
</histogram>
<histogram name="Media.Audio.OutputDeviceMixer.MaxMixedStreamCount{Device}"
units="streams" expires_after="2023-10-05">
<owner>olka@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Maximum number of output streams mixed simlutaniously by OutputDeviceMixer.
Recoreded when mixing stops (when all reference signal listeners are gone).
</summary>
<token key="Device">
<variant name="" summary="All"/>
<variant name=".Default" summary="Default device mixer"/>
<variant name=".NonDefault" summary="Non-default device mixer"/>
</token>
</histogram>
<histogram name="Media.Audio.OutputDeviceMixer.MixedPlaybackStatus"
enum="AudioOutputDeviceMixerMixedPlaybackStatus" expires_after="2023-10-22">
<owner>olka@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Health status of the mixed playback. Recorded when mixed playback stopped or
failed to start.
</summary>
</histogram>
<histogram name="Media.Audio.OutputDeviceMixer.MixingDuration{Device}"
units="ms" expires_after="2023-10-05">
<owner>olka@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Duration of the interval between the moment OutputDeviceMixer started mixed
playback (referece playback signal is requested by at least one listener and
there is at least one stream managed by the mixer playing) and the moment
OutputDeviceMixer stopped mixed playback (there are no more listeners). It
may include intervals recorded by
Media.Audio.OutputDeviceMixer.NoopMixingDuration histogram.
</summary>
<token key="Device">
<variant name="" summary="All"/>
<variant name=".Default" summary="Default device mixer"/>
<variant name=".NonDefault" summary="Non-default device mixer"/>
</token>
</histogram>
<histogram name="Media.Audio.OutputDeviceMixer.NoopMixingDuration" units="ms"
expires_after="2023-10-05">
<owner>olka@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Duration of the interval when there are no output streams to mix but there
are reference signal listeners present, so OutputDeviceMixer renders silence
and feeds it to the listeners as well. Recorded when an output stream starts
playing (and thus playback is not empty any more) or when all listeners are
gone (and thus mixing stops). There may be multiple such intervals during an
interval recorded by Media.Audio.OutputDeviceMixer.MixingDuration.
</summary>
</histogram>
<histogram name="Media.Audio.OutputDeviceMixer.OvertimeCount" units="count"
expires_after="2024-05-03">
<owner>olka@chromium.org</owner>
<owner>saza@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Number of times over a sampling interval (1000 callbacks) when the mixing
callback took longer than the playback buffer duration to finish. Capped at
100 (1/10 of all callbacks). Not logged if the mixer was called less than
1000 times.
</summary>
</histogram>
<histogram
name="Media.Audio.OutputDeviceMixer.StreamDuration.{MixingStatus}.{LatencyTag}"
units="ms" expires_after="2023-10-05">
<owner>olka@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Duration of the interval when an output stream managed by OutputDeviceMixer
is playing independently (Unmixed) or as a part of the mix (Mixed). Measured
between the moment the stream starts playing or its playback mode
(Mixed/Unmixed) changes, and the moment the stream stops playing or its
playback mode changes.
</summary>
<token key="MixingStatus">
<variant name="Mixed" summary="Stream is played as a part of the mix"/>
<variant name="Unmixed" summary="Stream is played independently"/>
</token>
<token key="LatencyTag">
<variant name="LatencyExactMs"/>
<variant name="LatencyInteractive"/>
<variant name="LatencyPlayback"/>
<variant name="LatencyRtc"/>
<variant name="LatencyUnknown"/>
</token>
</histogram>
<histogram name="Media.Audio.OutputDeviceMixer.StreamStatus"
enum="AudioOutputDeviceMixerStreamStatus" expires_after="2023-10-05">
<owner>olka@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Health status of each output stream managed by mixer. Recorded when the
stream is closed.
</summary>
</histogram>
<histogram name="Media.Audio.OutputDeviceMixerManager.StreamCreation"
enum="AudioOutputDeviceMixerManagerStreamCreation"
expires_after="2023-10-05">
<owner>olka@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
A path OutputDeviceMixerManager uses to create an output stream.
</summary>
</histogram>
<histogram name="Media.Audio.Processing.CaptureDelayMs" units="ms"
expires_after="2024-05-03">
<owner>saza@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The time, in milliseconds, between when a block of audio is read from the
soundcard and when it's presented to the audio processor. Used in
calculating the total system delay for the audio processor.
</summary>
</histogram>
<histogram name="Media.Audio.Processing.CaptureDelayVarianceMs"
units="ms squared" expires_after="2024-05-03">
<owner>saza@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The variance of the capture delay in milliseconds (see
Media.Audio.Processing.CaptureDelayMs). Logged once every second and
calculated over the past second of data.
</summary>
</histogram>
<histogram name="Media.Audio.Processing.RenderDelayMs" units="ms"
expires_after="2024-05-03">
<owner>saza@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The time, in milliseconds, between when a block of audio is presented to the
audio processor and the time it's played out on the soundcard. Used in
calculating the total system delay for the audio processor.
</summary>
</histogram>
<histogram name="Media.Audio.Processing.RenderDelayVarianceMs"
units="ms squared" expires_after="2024-05-03">
<owner>saza@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The variance of the render delay in milliseconds (see
Media.Audio.Processing.RenderDelayMs). Logged once every second and
calculated over the past second of data.
</summary>
</histogram>
<histogram name="Media.Audio.Processing.TotalDelayMs" units="ms"
expires_after="2024-05-03">
<owner>saza@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The estimated total audio system delay presented to the audio processor. The
sum of the individual capture and render delays at similar points in time.
</summary>
</histogram>
<histogram name="Media.Audio.Processing.TotalDelayVarianceMs"
units="ms squared" expires_after="2024-05-03">
<owner>saza@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The variance of the total delay in milliseconds (see
Media.Audio.Processing.TotalDelayMs). Logged once every second and
calculated over the past second of data.
</summary>
</histogram>
<histogram name="Media.Audio.RawProcessingSupportedWin" enum="BooleanSupported"
expires_after="2024-02-12">
<owner>henrika@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Whether the capture device supports raw audio capture or not. Emitted when
the audio input stream is closed but only on Windows platforms. Only
uploaded for the case when analog AGC is enabled, i.e., for WebRTC-based
audio input streams.
</summary>
</histogram>
<histogram name="Media.Audio.Render.FramesRequested" units="frames"
expires_after="2023-10-01">
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The number of frames audio is actually rendered at if the number is
different from the desired number of frames. If the desired frame size is
used, this value will be 0. Typically, Chrome will want to use a 10ms buffer
(e.g. 480 frames for a sample rate of 48kHz), but we might have to render
audio 256 frames at a time. This histogram gives us an indication as to how
frequent that is and what buffer sizes are used in practice. This value is
logged when an audio output stream is stopped.
</summary>
</histogram>
<histogram name="Media.Audio.Render.GetSourceDataTime.WebRTC"
units="microseconds" expires_after="2023-10-01">
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The time spent to get audio data from the source. For WebRTC, it's the time
spent in WebRtcAudioRenderer::SourceCallback. Logged every function call,
which is every 10 ms.
Warning: This metric may include reports from clients with low-resolution
clocks (i.e. on Windows, ref. |TimeTicks::IsHighResolution()|). Such reports
will cause this metric to have an abnormal distribution. When considering
revising this histogram, see UMA_HISTOGRAM_CUSTOM_MICROSECONDS_TIMES for the
solution.
</summary>
</histogram>
<histogram name="Media.Audio.Render.GetSourceDataTimeMax.WebRTC"
units="microseconds" expires_after="2023-11-12">
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The maximum time spent to get audio data from the source during a session.
For WebRTC, it's the time spent in WebRtcAudioRenderer::SourceCallback. A
session is between Start() and Stop() of WebRtcAudioRenderer.
Warning: This metric may include reports from clients with low-resolution
clocks (i.e. on Windows, ref. |TimeTicks::IsHighResolution()|). Such reports
will cause this metric to have an abnormal distribution. When considering
revising this histogram, see UMA_HISTOGRAM_CUSTOM_MICROSECONDS_TIMES for the
solution.
</summary>
</histogram>
<histogram name="Media.Audio.Render.OutputDeviceAuthorizationTime" units="ms"
expires_after="2023-08-08">
<owner>olka@chromium.org</owner>
<owner>henrika@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Similar to Media.Audio.OutputDeviceAuthorizationTime, this histogram
measures the time required for device authorization, but it is measured on
the renderer side when AudioOutputDevice calls RequestDeviceAuthorization on
the IO thread until it receives OnDeviceAuthorized, also on the IO thread.
Note that an authorization timeout will cause OnDeviceAuthorized to be
called, so for platforms that use a timeout, very few times will be above
the timeout value. Warning: this histogram was expired from 2020-04-05 to
2021-06-04; data may be missing.
</summary>
</histogram>
<histogram name="Media.Audio.Render.OutputDeviceAuthorizationTimedOut"
enum="BooleanTimedOut" expires_after="2023-10-22">
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Whether audio output device timed out waiting for authorization reply from
the browser side.
</summary>
</histogram>
<histogram name="Media.Audio.Render.OutputDeviceStartTime2" units="ms"
expires_after="2023-10-22">
<owner>dalecurtis@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The time delta from an AudioOutputDevice sending its first PlayStream
message to it getting its first data callback.
</summary>
</histogram>
<histogram name="Media.Audio.Render.OutputDeviceStatus"
enum="OutputDeviceStatus" expires_after="2023-11-05">
<owner>dalecurtis@chromium.org</owner>
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Device status received in response to device authorization request.
</summary>
</histogram>
<histogram name="Media.Audio.Render.OutputStreamDuration2" units="ms"
expires_after="2023-10-08">
<owner>olka@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
This histogram measures the duration of every output stream, as seen from
the renderer. It counts from when it has been successfully started, until it
is stopped. Streams that fail to start are not logged.
</summary>
</histogram>
<histogram
name="Media.Audio.Render.SinkCache.GetOutputDeviceInfoCacheUtilization"
enum="GetOutputDeviceInfoCacheHit" expires_after="2023-10-01">
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<summary>
Whether a cached sink was used to get audio output device information, or a
new sink was created for that.
</summary>
</histogram>
<histogram name="Media.Audio.Render.StreamCallbackError2"
enum="AudioRenderDeviceError" expires_after="never">
<!-- expires-never: Audio pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
When AudioOutputDevice is stopped, this stat is recorded with whether an
error callback was ever received over IPC, and in that case whether the
error occurred during or after stream creation. Expired in Apr 2020 and
re-enabled in May 2021.
</summary>
</histogram>
<histogram name="Media.Audio.TabAudioMuted" enum="Boolean"
expires_after="2023-11-12">
<owner>evliu@google.com</owner>
<owner>chrome-media-ux@google.com</owner>
<summary>
Logged when a user clicks on the audio indicator button in the tab strip.
Logs true if the click mutes the tab and false if the click unmutes the tab.
</summary>
</histogram>
<histogram name="Media.Audio.TrackAudioRenderer.DeviceStatus"
enum="OutputDeviceStatus" expires_after="never">
<!-- expires-never: used for audio output devices monitoring. -->
<!-- https://crbug.com/986492 -->
<owner>olka@chromium.org</owner>
<owner>fhernqvist@google.com</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Device status received during TrackAudioRenderer initialization. This is a
specific case of Media.Audio.Render.OutputDeviceStatus histogram.
</summary>
</histogram>
<histogram name="Media.Audio.TrackAudioRenderer.SwitchDeviceStatus"
enum="OutputDeviceStatus" expires_after="never">
<!-- expires-never: used for audio output devices monitoring. -->
<!-- https://crbug.com/986492 -->
<owner>olka@chromium.org</owner>
<owner>fhernqvist@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Device status received by TrackAudioRenderer when switching the output
device. This is a specific case of Media.Audio.Render.OutputDeviceStatus
histogram.
</summary>
</histogram>
<histogram name="Media.Audio.WebRTCAudioRenderer.DeviceStatus"
enum="OutputDeviceStatus" expires_after="never">
<!-- expires-never: used for WebRTC audio output devices monitoring. -->
<!-- https://crbug.com/986501 -->
<owner>olka@chromium.org</owner>
<owner>fhrenqvist@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Device status received during WebRTCAudioRenderer initialization. This is a
specific case of Media.Audio.Render.OutputDeviceStatus histogram.
</summary>
</histogram>
<histogram name="Media.Audio.WebRTCAudioRenderer.SwitchDeviceStatus"
enum="OutputDeviceStatus" expires_after="never">
<!-- expires-never: used for WebRTC audio output devices monitoring. -->
<!-- https://crbug.com/986501 -->
<owner>olka@chromium.org</owner>
<owner>fhernqvist@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Device status received by WebRTCAudioRenderer when switching the output
device. This is a specific case of Media.Audio.Render.OutputDeviceStatus
histogram.
</summary>
</histogram>
<histogram name="Media.Audio.{Type}.EarlyGlitchDetected" enum="BooleanDetected"
expires_after="2024-05-03">
<owner>olka@chromium.org</owner>
<owner>saza@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Whether a glitch in the capture/render audio at the OS level was detected
during the first 1000 OS callbacks of an active input/output stream. A
glitch is detected if the OS skips providing/requesting any frames of audio,
and is recorded when the stream ends, as long as the stream saw at least one
OS callback. Reported on Windows and Mac.
</summary>
<token key="Type">
<variant name="Capture"/>
<variant name="Render"/>
</token>
</histogram>
<histogram name="Media.Audio.{Type}.Glitches2" units="glitches"
expires_after="2024-05-03">
<owner>olka@chromium.org</owner>
<owner>saza@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The number of glitches that were detected at the OS level while an audio
input (Capture) or output (Render) stream was active. A glitch is detected
if the OS skips providing/requesting any frames of audio. This value is
aggregated over a period of 1000 OS callbacks (every 10 seconds for buffer
size 10 ms) and is logged at the end of each collection interval. Not
recorded for streams shorter than 1000 callbacks. Reported on Windows and
Mac.
</summary>
<token key="Type">
<variant name="Capture"/>
<variant name="Render"/>
</token>
</histogram>
<histogram name="Media.Audio.{Type}.LargestGlitchMs2" units="ms"
expires_after="2024-05-03">
<owner>olka@chromium.org</owner>
<owner>saza@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The length in milliseconds of the largest glitch that was detected at the OS
level by an audio input (Capture) or output (Render) stream. This value is
aggregated over a period of 1000 OS callbacks (every 10 seconds for buffer
size 10 ms) and is logged at the end of each collection interval if any
glitches were detected. Not recorded for streams shorter than 1000
callbacks. Reported on Windows and Mac.
</summary>
<token key="Type">
<variant name="Capture"/>
<variant name="Render"/>
</token>
</histogram>
<histogram name="Media.Audio.{Type}.LostFramesInMs2" units="ms"
expires_after="2024-05-03">
<owner>olka@chromium.org</owner>
<owner>saza@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The combined length in milliseconds of input (Capture) or output (Render)
audio glitches detected at the OS level. This is useful to know in
particular for audio processing such as echo cancellation. This value is
aggregated over a period of 1000 OS callbacks (every 10 seconds for buffer
size 10 ms) and is logged at the end of each collection interval if any
glitches were detected. Not recorded for streams shorter than 1000
callbacks. Reported on Windows and Mac.
</summary>
<token key="Type">
<variant name="Capture"/>
<variant name="Render"/>
</token>
</histogram>
<histogram name="Media.AudioBitsPerChannel" units="units" expires_after="M85">
<owner>dalecurtis@chromium.org</owner>
<summary>Bits per channel of HTML5 audio sample data.</summary>
</histogram>
<histogram name="Media.AudioCapturerAudioGlitches" enum="AudioGlitchResult"
expires_after="2023-10-15">
<owner>olka@chromium.org</owner>
<owner>gustaf@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Whether there is input audio glitches due to dropped input audio data or
not. Sampled when a low-latency input audio stream is destructed.
</summary>
</histogram>
<histogram name="Media.AudioCapturerDroppedData10sIntervals" units="drops"
expires_after="2023-10-05">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The number of input audio data blocks that were dropped at the
browser/renderer boundary due to for example buffer overflow in the writer
side buffer or in the socket. This value is aggregated over a period of 1000
input data pushes (every 10 seconds for buffer size 10 ms) and is logged at
the end of each collection interval. Not recorded for streams with less than
1000 input data pushes.
</summary>
</histogram>
<histogram name="Media.AudioCapturerDroppedData2.{Duration}" units="permille"
expires_after="2023-10-05">
<obsolete>
Deprecated in favor of Media.AudioCapturerDroppedData10sIntervals and
Media.AudioCapturerDroppedDataBelow10s. Data is no longer collected.
</obsolete>
<owner>olka@chromium.org</owner>
<owner>gustaf@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The proportion of input audio data that was dropped at the browser/renderer
boundary due to for example buffer overflow in the writer side buffer or in
the socket. Reported at the destruction of low-latency audio input stream.
Rounded up, cropped to 1/10 of all callbacks.
</summary>
<token key="Duration">
<variant name="Long" summary="Streams equal or longer than 3000 callbacks"/>
<variant name="Short" summary="Streams shorter than 3000 callbacks"/>
</token>
</histogram>
<histogram name="Media.AudioCapturerDroppedDataBelow10s" units="drops"
expires_after="2023-10-05">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The number of input audio data blocks that were dropped at the
browser/renderer boundary due to for example buffer overflow in the writer
side buffer or in the socket. This value is only logged for streams with
less than 1000 input data pushes (10 seconds for buffer size 10 ms).
</summary>
</histogram>
<histogram name="Media.AudioCapturerMissedReadDeadline10sIntervals"
units="misses" expires_after="2023-10-05">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The number of times input audio data blocks that had to be buffered because
there was not room in the shared memory ring buffer on the browser/renderer
boundary. This happens if the reading side hasn't read data in time. This
value is aggregated over a period of 1000 input data pushes (every 10
seconds for buffer size 10 ms) and is logged at the end of each collection
interval. Not recorded for streams with less than 1000 input data pushes.
</summary>
</histogram>
<histogram name="Media.AudioCapturerMissedReadDeadline2.{Duration}"
units="permille" expires_after="2023-10-05">
<obsolete>
Deprecated in favor of Media.AudioCapturerMissedReadDeadline10sIntervals and
Media.AudioCapturerMissedReadDeadlineBelow10s. Data is no longer collected.
</obsolete>
<owner>olka@chromium.org</owner>
<owner>gustaf@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The proportion of input audio data blocks that had to be buffered because
there was not room in the shared memory ring buffer on the browser/renderer
boundary. This happens if the reading side hasn't read data in time.
Reported at the destruction of low-latency audio input stream. Rounded up,
cropped to 1/10 of all callbacks.
</summary>
<token key="Duration">
<variant name="Long" summary="Streams equal or longer than 3000 callbacks"/>
<variant name="Short" summary="Streams shorter than 3000 callbacks"/>
</token>
</histogram>
<histogram name="Media.AudioCapturerMissedReadDeadlineBelow10s" units="misses"
expires_after="2023-10-05">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The number of times input audio data blocks that had to be buffered because
there was not room in the shared memory ring buffer on the browser/renderer
boundary. This happens if the reading side hasn't read data in time. This
value is only logged for streams with less than 1000 input data pushes (10
seconds for buffer size 10 ms).
</summary>
</histogram>
<histogram name="Media.AudioCodec" enum="AudioCodec" expires_after="never">
<!-- expires-never: Codec support planning metric. -->
<owner>dalecurtis@chromium.org</owner>
<summary>Audio codec used in HTML5 media.</summary>
</histogram>
<histogram name="Media.AudioCodecProfile.AAC" enum="AudioCodecProfile"
expires_after="2023-09-24">
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>Audio codec profile used in HTML5 media for AAC playback.</summary>
</histogram>
<histogram name="Media.AudioInputController" units="ms" expires_after="never">
<!-- expires-never: Audio pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>Measures the time taken for AudioInputController::</summary>
</histogram>
<histogram name="Media.AudioInputDevice.AudioServiceDelay" units="ms"
expires_after="2023-11-19">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The audio capture delay in the Audio Service, including the IPC and the OS.
Logged at every CaptureCallback::Capture() call at AudioInputDevice level.
</summary>
</histogram>
<histogram name="Media.AudioInputDevice.AudioServiceDelayDifference{Duration}"
units="ms" expires_after="2023-08-01">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The difference between the largest and the lowest audio capture delay
observed during the sample interval. This stat considers the audio capture
delay in the Audio Service, including the IPC and the OS. Logged at the end
of each 1000-callback interval for Intervals. Logged at the end of the
stream for Short.
</summary>
<token key="Duration" variants="AudioAggregationDuration"/>
</histogram>
<histogram name="Media.AudioInputDevice.AudioServiceGlitchCount{Duration}"
units="glitches" expires_after="2024-02-01">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The number of events causing audio capture glitches in the Audio Service,
including the IPC and the OS. A glitch is when capture data is dropped due
to a buffer overflow. Logged at the end of each 1000-callback interval for
Intervals. Logged at the end of the stream for Short.
</summary>
<token key="Duration" variants="AudioAggregationDuration"/>
</histogram>
<histogram name="Media.AudioInputDevice.AudioServiceGlitchDuration{Duration}"
units="permille" expires_after="2024-02-01">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The proportion of the audio capture interval that was dropped due to buffer
overflows in the Audio Service, including the IPC and the OS. Logged at the
end of each 1000-callback interval for Intervals. Logged at the end of the
stream for Short.
</summary>
<token key="Duration" variants="AudioAggregationDuration"/>
</histogram>
<histogram name="Media.AudioOutputController.CallbackError" enum="BooleanError"
expires_after="2023-10-22">
<owner>olka@chromium.org</owner>
<owner>guidou@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
A boolean that reflects whether or not an error was reported during audio
rendering, reported after a stream has stopped, if it was started.
</summary>
</histogram>
<histogram name="Media.AudioOutputController.LifeTime" units="ms"
expires_after="never">
<!-- expires-never: used for audio output controller monitoring. -->
<!-- https://crbug.com/1036864 -->
<owner>olka@chromium.org</owner>
<owner>guidou@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Time interval from the output stream controller construction to its
destruction.
</summary>
</histogram>
<histogram name="Media.AudioOutputController.ProxyStreamCreationResult"
enum="AudioOutputStreamCreationResult" expires_after="2023-10-22">
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Whether an AudioOutputController succeeded in creating and opening an output
stream proxy after receiving a default device change event. Note: in
September 2021 this histogram unintentionally swapped its meaning with
Media.AudioOutputController.ProxyStreamCreationResultForDeviceChange.
</summary>
</histogram>
<histogram
name="Media.AudioOutputController.ProxyStreamCreationResultForDeviceChange"
enum="AudioOutputStreamCreationResult" expires_after="2023-10-22">
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Whether an AudioOutputController succeeded in creating and opening an output
stream proxy. Only logged for the initial creation, subsequent re-creations
due to device change events are logged in the
Media.AudioOutputController.ProxyStreamCreationResult histogram. Note: in
September 2021 this histogram unintentionally swapped its meaning with
Media.AudioOutputController.ProxyStreamCreationResult.
</summary>
</histogram>
<histogram name="Media.AudioOutputControllerDataNotReady" units="ms"
expires_after="never">
<!-- expires-never: Audio pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Time spent waiting in AudioOutputController::WaitTillDataReady() if the data
was not initially available.
</summary>
</histogram>
<histogram name="Media.AudioOutputControllerPlaybackStartupSuccess"
enum="BooleanSuccess" expires_after="never">
<!-- expires-never: Audio pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Whether playback started successfully after stream startup was requested.
</summary>
</histogram>
<histogram
name="Media.AudioOutputDevice.AudioServiceDelayDifference{Duration}{LatencyTag}"
units="ms" expires_after="2023-08-01">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>dalecurtis@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The difference between the largest and the lowest audio playout delay
observed during the sample interval. This stat considers the audio playout
delay in the Audio Service, including the IPC and the OS. Logged at the end
of each 1000-callback interval for Intervals. Logged at the end of the
stream for Short.
</summary>
<token key="Duration" variants="AudioAggregationDuration"/>
<token key="LatencyTag" variants="AudioLatencyTag"/>
</histogram>
<histogram name="Media.AudioOutputDevice.AudioServiceDelay{LatencyTag}"
units="ms" expires_after="2024-02-01">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>dalecurtis@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The audio playout delay in the Audio Service, including the IPC and the OS.
Logged at every RenderCallback::Render() call at AudioPlayoutDevice level.
</summary>
<token key="LatencyTag" variants="AudioLatencyTag"/>
</histogram>
<histogram
name="Media.AudioOutputDevice.AudioServiceGlitchCount{Duration}{LatencyTag}"
units="glitches" expires_after="2024-02-01">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>dalecurtis@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The number of events causing audio playout glitches in the Audio Service,
including the IPC and the OS. A glitch is an inserted silence due to an
underrun. Logged at the end of each 1000-callback interval for Intervals.
Logged at the end of the stream for Short.
</summary>
<token key="Duration" variants="AudioAggregationDuration"/>
<token key="LatencyTag" variants="AudioLatencyTag"/>
</histogram>
<histogram
name="Media.AudioOutputDevice.AudioServiceGlitchDuration{Duration}{LatencyTag}"
units="permille" expires_after="2024-02-01">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>dalecurtis@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The proportion of the audio playout interval that was silent due to
underruns in the Audio Service, including the IPC and the OS. Logged at the
end of each 1000-callback interval for Intervals. Logged at the end of the
stream for Short.
</summary>
<token key="Duration" variants="AudioAggregationDuration"/>
<token key="LatencyTag" variants="AudioLatencyTag"/>
</histogram>
<histogram name="Media.AudioOutputResampler.OpenLowLatencyStream"
enum="AudioOutputResamplerLowLatencyOpenStreamResult"
expires_after="2023-10-22">
<owner>olka@chromium.org</owner>
<owner>armax@chromium.org</owner>
<owner>guidou@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Whether a low latency stream to be rendered through the resampler was opened
successfully or which type of fallback stream was used instead. In case a
fake fallback stream is used it means audio rendered through the resampler
will be muted. In case fallback fails entirely, renderer callback error will
be signalled.
</summary>
</histogram>
<histogram name="Media.AudioOutputStreamProxy.StreamFormat"
enum="AudioOutputProxyStreamFormat" expires_after="2023-10-01">
<owner>olka@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Records format used by AudioManager to create audio output stream proxy. If
a fake stream is created it results in muted audio playback. Warning: this
histogram was expired from 2021-01-01 to 2022-01-21; data may be missing.
</summary>
</histogram>
<histogram name="Media.AudioRendererAudioGlitches" enum="AudioGlitchResult"
expires_after="2023-04-16">
<obsolete>
Deprecated in favor of Media.AudioRendererAudioGlitches2. Data is no longer
collected.
</obsolete>
<owner>henrika@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Captures if render-side audio glitches are detected or not. Sampled when a
low-latency output audio stream is destructed.
</summary>
</histogram>
<histogram name="Media.AudioRendererAudioGlitches2.{LatencyTag}"
enum="AudioGlitchResult" expires_after="2024-02-05">
<owner>dalecurtis@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>fhernqvist@google.com</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Captures if render-side audio glitches are detected or not. Sampled when a
low-latency output audio stream is destructed.
</summary>
<token key="LatencyTag">
<variant name="" summary="All latencies combined"/>
<variant name="LatencyExactMs"/>
<variant name="LatencyInteractive"/>
<variant name="LatencyPlayback"/>
<variant name="LatencyRtc"/>
<variant name="LatencyUnknown"/>
</token>
</histogram>
<histogram name="Media.AudioRendererImpl.SinkStatus" enum="OutputDeviceStatus"
expires_after="2023-11-02">
<owner>olka@chromium.org</owner>
<owner>fhernqvist@google.com</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Status of audio sink used by AudioRendererImpl. If not OK, a NullAudioSink
will be used for audio output instead. This is logged for every call to
AudioRendererImpl::Initialize, which generally occurs once per active audio
session (i.e., between a play and pause). If audio track changes are ever
enabled, it may additionally be called for every audio track change.
</summary>
</histogram>
<histogram
name="Media.AudioRendererMissedDeadline2{Mixing}{Duration}{LatencyTag}"
units="permille" expires_after="2023-02-05">
<obsolete>
Deprecated in favor of Media.AudioRendererMissedDeadline3. Data is no longer
collected.
</obsolete>
<owner>dalecurtis@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Proportion of SyncReader::Read() calls where the renderer missed its
realtime deadline. Rounded up, clipped to 1/10 of the stream callbacks.
Sampled when a low-latency output audio stream is destructed.
</summary>
<token key="Mixing">
<variant name="" summary="Whole stream lifetime"/>
<variant name=".Mixing" summary="During mixing"/>
</token>
<token key="Duration">
<variant name=".Long"
summary="Streams equal or longer than 3000 callbacks"/>
<variant name=".Short" summary="Streams shorter than 3000 callbacks"/>
</token>
<token key="LatencyTag">
<variant name="" summary="All latencies combined"/>
<variant name=".LatencyExactMs"/>
<variant name=".LatencyInteractive"/>
<variant name=".LatencyPlayback"/>
<variant name=".LatencyRtc"/>
<variant name=".LatencyUnknown"/>
</token>
</histogram>
<histogram
name="Media.AudioRendererMissedDeadline3{Mixing}{Duration}{LatencyTag}"
units="misses" expires_after="2023-10-13">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>dalecurtis@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
The number of SyncReader::Read() calls where the renderer missed its
realtime deadline. Logged at the end of each 1000-read interval for
Intervals. Logged at the end of the stream for Short.
</summary>
<token key="Mixing">
<variant name="" summary="Whole stream lifetime"/>
<variant name=".Mixing" summary="During mixing"/>
</token>
<token key="Duration">
<variant name=".Intervals" summary="Whole intervals of 1000 reads"/>
<variant name=".Short" summary="Streams shorter than 1000 reads"/>
</token>
<token key="LatencyTag">
<variant name="" summary="All latencies combined"/>
<variant name=".LatencyExactMs"/>
<variant name=".LatencyInteractive"/>
<variant name=".LatencyPlayback"/>
<variant name=".LatencyRtc"/>
<variant name=".LatencyUnknown"/>
</token>
</histogram>
<histogram name="Media.AudioService.AudioManagerStartupTime" units="ms"
expires_after="2023-10-05">
<owner>fhernqvist@google.com</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
How long it take for the audio manager instance to be created by the audio
service, in case the audio service owns the audio manager.
</summary>
</histogram>
<histogram name="Media.AudioSystem.GetDeviceDescription.Result"
enum="BooleanSuccess" expires_after="2023-11-19">
<owner>toprice@chromium.org</owner>
<owner>olka@chromium.org</owner>
<summary>
Records whether AudioSystemToServiceAdapter::GetDeviceDescriptions calls to
the audio service returned successfully, or failed and retured an default
empty list due to an audio service crash.
</summary>
</histogram>
<histogram name="Media.AudioThreadStatus" enum="AudioThreadStatus"
expires_after="never">
<!-- expires-never: Audio pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
State of the audio thread. A value of &quot;started&quot; is emitted once
the hang monitor has been initialized. If the thread is detected as hung
later, a value of &quot;hung&quot; is emitted. If the hung thread later
recovers a value of &quot;recovered&quot; is emitted.
</summary>
</histogram>
<histogram name="Media.AVDA.FrameInformation" enum="AVDAFrameInformation"
expires_after="2020-09-05">
<owner>liberato@chromium.org</owner>
<owner>videostack-eng@chromium.org</owner>
<summary>
Record a count for each frame sent to the client by AVDA, separated by what
type of frame it is: Non Overlay, secure overlay, etc.
</summary>
</histogram>
<histogram name="Media.AVDA.FrameSentAsOverlay" enum="BooleanFrameAsOverlay"
expires_after="M86">
<owner>liberato@chromium.org</owner>
<owner>videostack-eng@chromium.org</owner>
<summary>
Record a count for each frame sent to the client by AVDA. True counts
indicate that the frame was an overlay (SurfaceView). False counts are for
Non Overlay frames. This will be deprecated in favor of
Media.AVDA.FrameInformation in M63.
</summary>
</histogram>
<histogram name="Media.BreakoutBox.Usage" enum="BreakoutBoxUsage"
expires_after="2023-10-22">
<owner>guidou@chromium.org</owner>
<owner>hta@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<summary>
Usage of various BreakoutBox features. Recorded when a stream is created or
transferred in MediaStreamTrackProcessor or MediaStreamTrackGenerator.
</summary>
</histogram>
<histogram name="Media.Capabilities.DecodingInfo.Time.Video" units="ms"
expires_after="never">
<!-- expires-never: performance monitoring. -->
<owner>chcunningham@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Time spent between receiving a decodingInfo() call and resolving it. It only
record successful calls and ignores audio-only.
</summary>
</histogram>
<histogram name="Media.Capabilities.DecodingInfo.Time.Video.Clear" units="ms"
expires_after="never">
<!-- expires-never: performance monitoring. -->
<owner>chcunningham@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Time spent between receiving a decodingInfo() call and resolving it. It only
record successful calls and ignores audio-only. This is a subset of
Media.Capabilities.DecodingInfo.RequestTime.Video that only takes into
account clear content.
</summary>
</histogram>
<histogram name="Media.Capabilities.DecodingInfo.Time.Video.Encrypted"
units="ms" expires_after="never">
<!-- expires-never: performance monitoring. -->
<owner>chcunningham@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Time spent between receiving a decodingInfo() call and resolving it. It only
record successful calls and ignores audio-only. This is a subset of
Media.Capabilities.DecodingInfo.RequestTime.Video that only takes into
account encrypted content.
</summary>
</histogram>
<histogram name="Media.ConditionalFocus.Decision"
enum="ConditionalFocusDecision" expires_after="2023-09-17">
<owner>eladalon@chromium.org</owner>
<owner>toprice@chromium.org</owner>
<summary>
Records (1) explicit conditional-focus API invocations, (2) microtask-borne
decisions and (3) timer-triggered decisions.
</summary>
</histogram>
<histogram name="Media.ConditionalFocus.ExplicitLateCall" units="ms"
expires_after="2023-07-18">
<owner>eladalon@chromium.org</owner>
<owner>toprice@chromium.org</owner>
<summary>
Records the delay experienced by late explicit invocations of the focus()
API. By &quot;late&quot; we mean those calls which had no effect, on account
of arriving after the browser-side timer forced an implicit decision. (Note
that post-microtask explicit invocations are not recorded. They're simply an
application error.)
</summary>
</histogram>
<histogram name="Media.ConditionalFocus.ExplicitOnTimeCall" units="ms"
expires_after="2023-07-18">
<owner>eladalon@chromium.org</owner>
<owner>toprice@chromium.org</owner>
<summary>
Records the delay experienced by on-time explicit invocations of the focus()
API. By &quot;on-time&quot; we mean those calls which had an effect, on
account of arriving before either the microtask or the browser-side timer
forced an implicit decision.
</summary>
</histogram>
<histogram name="Media.ConditionalFocus.MicrotaskDelay" units="ms"
expires_after="2023-07-18">
<owner>eladalon@chromium.org</owner>
<owner>toprice@chromium.org</owner>
<summary>
Track the delay distribution of invocations of the microtask. Measure this
independently of whether an explicit API call was made, and independently of
whether the browser-side timer expired.
</summary>
</histogram>
<histogram base="true" name="Media.ConfigChangeDecoderSelectionTime" units="ms"
expires_after="2023-01-01">
<obsolete>
Removed 02/2023 due to lack of further need for this data.
</obsolete>
<owner>cassew@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Duration of decoder selection during config changes, measured from first
call to 'DecoderSelector::SelectDecoder' to
'DecoderSelector::FinalizeSelection'. The HW/SW suffix indicates the type of
the decoder that was ultimately selected.
</summary>
</histogram>
<histogram name="Media.Controls.CTR" enum="MediaControlsCTREvent"
expires_after="2023-10-08">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records events related to click through rate (CTR) calculation.
The CTR can be calculated by computing &quot;Interacted&quot; /
&quot;Displayed&quot;. &quot;Interacted&quot;, for buttons, means that they
were clicked. For sliders, it will reflect any change in the internal state
and includes other events in addition to clicks. &quot;Displayed&quot; means
that the control element was meant to be displayed in the controls. It does
not mean that the user have seen the element so is not to be confused with
visibility. Furthermore, because the controls UI changes while loading,
&quot;Displayed&quot; is only computed when metadata are available unless
preloading was disabled on the element or the browser.
Data is missing from 2020-04-05 to 2021-05-18.
</summary>
</histogram>
<histogram name="Media.Controls.PlaybackSpeed"
enum="MediaControlsPlaybackSpeed" expires_after="2023-11-12">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Record the playback speed selected by the user in the list of playback
speeds on the media controls.
</summary>
</histogram>
<histogram name="Media.Controls.Show.Audio" enum="MediaControlsShowReason"
expires_after="2023-10-22">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Record whether the default media controls of an audio element were shown and
why every time they could be shown. Note that audio elements that were not
insterted to the DOM and do not have a controls attribute are not taken into
account.
</summary>
</histogram>
<histogram name="Media.Controls.Show.Video" enum="MediaControlsShowReason"
expires_after="2022-10-30">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Record whether the default media controls of a video element were shown and
why every time they could be shown.
</summary>
</histogram>
<histogram name="Media.CrosBeamformingDeviceState"
enum="CrosBeamformingDeviceState" expires_after="M85">
<owner>dalecurtis@chromium.org</owner>
<summary>
The state of the user selected virtual beamforming audio device on CrOS.
It's logged whenever the format of the audio input stream is queried, which
at least happens on stream startup, but could happen at other times as well.
</summary>
</histogram>
<histogram name="Media.CrosGlobalMediaControls.PinAction" enum="BooleanPinned"
expires_after="2022-04-24">
<owner>jazzhsue@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Record each time user pins/unpins CrOS global media controls.
</summary>
</histogram>
<histogram name="Media.CrosGlobalMediaControls.QuickSettingUserAction"
enum="MediaSessionAction" expires_after="2022-04-24">
<owner>jazzhsue@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The action user clicked on the media controls in quick settings.
</summary>
</histogram>
<histogram name="Media.CrosGlobalMediaControls.RepeatUsageInQuickSetting"
enum="BooleanIsRepeat" expires_after="2022-05-01">
<owner>jazzhsue@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Record each time media controls' sub-menu in quick settings is opened. True
if it is a repeat usage.
</summary>
</histogram>
<histogram name="Media.CrosGlobalMediaControls.RepeatUsageOnShelf"
enum="BooleanIsRepeat" expires_after="2022-04-24">
<owner>jazzhsue@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Record each time global media controls on the shelf is opened. True if it is
a repeat usage.
</summary>
</histogram>
<histogram name="Media.D3D11.DecoderLifetimeProgression"
enum="D3D11LifetimeProgression" expires_after="2022-09-11">
<owner>liberato@chromium.org</owner>
<owner>tmathmeyer@chromium.org</owner>
<summary>
This enum allows us to count D3D11VideoDecoder specific crashes and
initialization failures. This is recorded whenever the decoder is
initialized or destroyed.
</summary>
</histogram>
<histogram name="Media.D3D11.NotifyErrorStatus" enum="MediaStatusCode"
expires_after="2022-08-28">
<owner>liberato@chromium.org</owner>
<owner>tmathmeyer@chromium.org</owner>
<summary>
This records the media::StatusCode that was sent to NotifyError. kOk is not
recorded here. It is recorded when D3D11VideoDecoder reports an error to the
client. For decoder failures, an additional status code may be logged by the
accelerator -- see Media.D3D11{H264,VP9}Status for that.
</summary>
</histogram>
<histogram name="Media.D3D11.UnusedPictureBufferCount.MultiTexture"
units="instances" expires_after="2022-11-01">
<owner>liberato@chromium.org</owner>
<owner>tmathmeyer@chromium.org</owner>
<summary>
This histogram lets us count how many PictureBuffers we've overallocated
when we're allocating each texture separately. This case is relatively
simple to optimize compared to SingleTexture.
</summary>
</histogram>
<histogram name="Media.D3D11.UnusedPictureBufferCount.SingleTexture"
units="instances" expires_after="2022-11-01">
<owner>liberato@chromium.org</owner>
<owner>tmathmeyer@chromium.org</owner>
<summary>
This histogram lets us count how many PictureBuffers we've overallocated
when we're allocating in contiguous blocks. This case is harder to optimize
than the MultiTexture variant, but it is good to know the proportion of the
two of them to determine usage.
</summary>
</histogram>
<histogram name="Media.DetectedAudioCodecHash" enum="FFmpegCodecHashes"
expires_after="never">
<!-- expires-never: Codec support planning metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Audio codec used in HTML5 media. Reporting corrected in M51 to include all
detected audio codecs, not just those up to and including the first one
supported.
</summary>
</histogram>
<histogram name="Media.DetectedAudioCodecHash.Local" enum="FFmpegCodecHashes"
expires_after="never">
<!-- expires-never: Codec support planning metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>Audio codec used in HTML5 media for a local file playback.</summary>
</histogram>
<histogram name="Media.DetectedContainer" enum="MediaContainers"
expires_after="never">
<!-- expires-never: Codec support planning metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Container used for HTML5 media. Views that include pre-M34 data will
categorize dash (38) and smooth streaming (39) in the &quot;Other&quot;
bucket.
</summary>
</histogram>
<histogram name="Media.DetectedContainer.Local" enum="MediaContainers"
expires_after="never">
<!-- expires-never: Codec support planning metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>Container used for HTML5 media for a local file playback.</summary>
</histogram>
<histogram name="Media.DetectedVideoCodecHash" enum="FFmpegCodecHashes"
expires_after="never">
<!-- expires-never: Codec support planning metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Video codec used in HTML5 media. Reporting corrected in M51 to include all
detected video codecs, not just those up to and including the first one
supported.
</summary>
</histogram>
<histogram name="Media.DetectedVideoCodecHash.Local" enum="FFmpegCodecHashes"
expires_after="never">
<!-- expires-never: Codec support planning metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>Video codec used in HTML5 media for a local file playback.</summary>
</histogram>
<histogram name="Media.DocumentPictureInPicture.CloseReason"
enum="DocumentPictureInPictureCloseReason" expires_after="2024-02-01">
<owner>steimel@chromium.org</owner>
<owner>liberato@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records the reason why a document picture-in-picture window is closed (e.g.
the user clicking on the Back to Tab button). Recorded on destruction of the
picture-in-picture window.
</summary>
</histogram>
<histogram name="Media.DroppedFrameCount" units="units" expires_after="never">
<!-- expires-never: Media pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Count of dropped frames between pipeline start and stop. Media pipeline
starts/stops when an HTML5 video is loaded/unloaded respectively in the
browser.
</summary>
</histogram>
<histogram name="Media.DroppedFrameCount2.{RendererType}.{ClearOrEncrypted}"
units="units" expires_after="2023-09-08">
<owner>dalecurtis@chromium.org</owner>
<owner>frankli@microsoft.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Monitors the DroppedFrameCount that is originated from a {RendererType} and
the video playback is {ClearOrEncrypted}. It is the count of dropped video
frames when an HTML5 video is unloaded.
</summary>
<token key="RendererType" variants="RendererType"/>
<token key="ClearOrEncrypted">
<variant name="Clear"/>
<variant name="Encrypted"/>
</token>
</histogram>
<histogram name="Media.DXVAVDA.DecoderLifetimeProgression"
enum="DXVALifetimeProgression" expires_after="2022-04-24">
<obsolete>
Removed 05/2022 due to lack of further need for this data.
</obsolete>
<owner>liberato@chromium.org</owner>
<owner>tmathmeyer@chromium.org</owner>
<summary>
This enum allows us to count DXVAVideoDecoderWin specific crashes and
initialization failures. This is recorded whenever the decoder is
initialized or destroyed, or encounters an error.
</summary>
</histogram>
<histogram name="Media.DXVAVDA.PictureBufferMechanism"
enum="PictureBufferMechanism" expires_after="2020-10-11">
<owner>liberato@chromium.org</owner>
<owner>sandersd@chromium.org</owner>
<summary>
This enum measures how often each of the various DXVAVDA PictureBuffer
display mechanisms are used. Each count represents the mechanism selected at
the end of DXVA::Initialize; i.e., there is one count per decoder.
</summary>
</histogram>
<histogram name="Media.DXVAVDA.UseD3D11" enum="DXVADXVersion"
expires_after="2022-07-03">
<owner>liberato@chromium.org</owner>
<owner>tmathmeyer@chromium.org</owner>
<owner>sandersd@chromium.org</owner>
<summary>
Records how many times the DXVA VDA successfully initializes a D3D11 device
vs. D3D9 device.
</summary>
</histogram>
<histogram name="Media.EME.CdmFileIO.FileSizeKBOnError" units="KB"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Size in KB of the last file successfully read by the CDM through CDM FileIO
before a specific error happens. This is reported only when the error
happens, which should be rare.
</summary>
</histogram>
<histogram name="Media.EME.CdmFileIO.FileSizeKBOnFirstRead" units="KB"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Size in KB of the first file successfully read by the CDM through CDM
FileIO. This is recorded once per CDM instance.
</summary>
</histogram>
<histogram name="Media.EME.CdmFileIO.TimeTo.{FileOperation}{IncognitoOrNormal}"
units="ms" expires_after="2024-04-11">
<owner>jrummell@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The actual time spent by the CDM FileIO {FileOperation} operation under
{IncognitoOrNormal} mode. Only recorded for successful operations.
</summary>
<token key="FileOperation" variants="FileOperation"/>
<token key="IncognitoOrNormal" variants="IncognitoOrNormal"/>
</histogram>
<histogram name="Media.EME.CdmFileIO.{FileOperation}{IncognitoOrNormal}"
enum="BooleanSuccess" expires_after="2024-04-11">
<owner>jrummell@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether a CDM FileIO {FileOperation} operation succeded or not under
{IncognitoOrNormal} mode.
</summary>
<token key="FileOperation" variants="FileOperation"/>
<token key="IncognitoOrNormal" variants="IncognitoOrNormal"/>
</histogram>
<histogram name="Media.EME.CdmFileIO::OpenFile" enum="CdmStorageStatus"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The status of file open received by MojoCdmFileIO. This is reported every
time the CDM tries to open a file for read or write.
</summary>
</histogram>
<histogram name="Media.EME.CdmHostVerificationStatus"
enum="CdmHostVerificationStatus" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The status of CDM host verification. This is reported per CDM load.
</summary>
</histogram>
<histogram name="Media.EME.CdmInterfaceVersion" enum="GenericEnum"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Chromium could support multiple versions of CDM interface. This metric
records the CDM interface version that the CDM created by Chromium uses.
This is recorded once per CDM instance.
</summary>
</histogram>
<histogram name="Media.EME.CdmLoadErrorCode" enum="WinGetLastError"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The error code of a library CDM load failure. Only reported on Windows.
</summary>
</histogram>
<histogram name="Media.EME.CdmLoadResult" enum="CdmLoadResult"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>The result from an attempt to load a library CDM.</summary>
</histogram>
<histogram name="Media.EME.CdmLoadTime" units="ms" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>The time spent to load a library CDM.</summary>
</histogram>
<histogram name="Media.EME.CrosCdmType" enum="CrosCdmType"
expires_after="2022-01-15">
<owner>jkardatzke@chromium.org</owner>
<owner>cros-gfx-video@google.com</owner>
<summary>
Whether we used the platform CDM on Chrome OS that includes HW secure
Widevine support, or fell back to the Chrome SW CDM.
</summary>
</histogram>
<histogram name="Media.EME.CrosPlatformCdm.SystemCode" enum="CdmSystemCode"
expires_after="2022-01-15">
<owner>jkardatzke@chromium.org</owner>
<owner>cros-gfx-video@google.com</owner>
<summary>System code in promise rejection for ChromeOS platform CDM.</summary>
</histogram>
<histogram name="Media.EME.EncryptedEvent" enum="BooleanEncryptedEvent"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether EME encrypted event has been fired. Every time a WebMediaPlayerImpl
object is created a &quot;false&quot; value is reported to provide a
baseline. Every time an encrypted event is fired, a &quot;true&quot; value
will be reported. Note that it is possible to have multiple encrypted events
during the lifetime of a WebMediaPlayerImpl object.
</summary>
</histogram>
<histogram name="Media.EME.EncryptedMediaEnabled" enum="BooleanEnabled"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether encrypted media is enabled when requestMediaKeySystemAccess() is
called. User can enable and disable encrypted media in content settings.
Recorded when requestMediaKeySystemAccess() is called but will be reported
at most once per renderer process.
</summary>
</histogram>
<histogram name="Media.EME.EncryptionScheme.Initial.Audio"
enum="MediaEncryptionScheme" expires_after="2024-04-11">
<owner>jrummell@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The encryption scheme used by the audio stream in an HTML5 video. Reported
when metadata is available if the initial config is encrypted.
</summary>
</histogram>
<histogram name="Media.EME.EncryptionScheme.Initial.Video"
enum="MediaEncryptionScheme" expires_after="2024-04-11">
<owner>jrummell@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The encryption scheme used by the video stream in an HTML5 video. Reported
when metadata is available if the initial config is encrypted.
</summary>
</histogram>
<histogram name="Media.EME.IsIncognito" enum="BooleanIncognito"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether a given WebMediaPlayer instance, with a CDM attached, is played in
an incognito window or in Chrome OS guest mode. Players that never started
playback are excluded. Recorded once at time of player destruction.
</summary>
</histogram>
<histogram name="Media.EME.MediaCryptoAvailable" enum="BooleanAvailable"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether MediaCrypto is available on a MediaDrm-based CDM. Reported once per
MediaDrmBridge creation. In normal cases it should always be available.
</summary>
</histogram>
<histogram name="Media.EME.MediaDrm.GetOriginIdResult" enum="GetOriginIdResult"
expires_after="2024-04-11">
<owner>jrummell@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The status of every attempt to obtain a pre-provisioned origin ID to be used
by MediaDrm. This will only be reported for applications that use
MediaDrmOriginIdManager.
</summary>
</histogram>
<histogram
name="Media.EME.MediaDrm.PreprovisionedOriginId.NonPerAppProvisioningDevice"
units="units" expires_after="2024-04-11">
<owner>jrummell@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The number of pre-provisioned origin IDs available shortly after startup on
devices that do not support per-application provisioning.
</summary>
</histogram>
<histogram
name="Media.EME.MediaDrm.PreprovisionedOriginId.PerAppProvisioningDevice"
units="units" expires_after="2024-04-11">
<owner>jrummell@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The number of pre-provisioned origin IDs available shortly after startup on
devices that support per-application provisioning.
</summary>
</histogram>
<histogram name="Media.EME.MediaDrmBridge.KeySystemSupport"
enum="BooleanSupported" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether MediaDrmBridge supports the key system. Reported once per
MediaDrmBridge creation. In normal cases it should always be supported.
</summary>
</histogram>
<histogram name="Media.EME.MediaFoundationCdm.ActivateCdmFactory"
enum="Hresult" expires_after="2024-04-11">
<owner>sangbaekpark@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
HRESULT of MediaFoundationCdmModule::ActivateCdmFactory(). This is only
reported when ActivateCdmFactory() fails.
</summary>
</histogram>
<histogram name="Media.EME.MediaFoundationCdm.LoadErrorCode"
enum="WinGetLastError" expires_after="2024-04-11">
<owner>sangbaekpark@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The error code of a library CDM load failure. Only reported on Windows.
</summary>
</histogram>
<histogram name="Media.EME.MediaFoundationCdm.LoadResult" enum="CdmLoadResult"
expires_after="2024-04-11">
<owner>sangbaekpark@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The result from an attempt to load a library MediaFoundation CDM.
</summary>
</histogram>
<histogram name="Media.EME.MediaFoundationCdm.LoadTime" units="ms"
expires_after="2024-04-11">
<owner>sangbaekpark@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>The time spent to load a library MediaFoundation CDM.</summary>
</histogram>
<histogram
name="Media.EME.MediaFoundationCdm.Widevine.HardwareSecure.FirstInitialize"
enum="Hresult" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
HRESULT of the first (and only the first) MediaFoundationCdm initialization
in a MeidaFoundationService process when using Widevine in hardware secure
mode. Reported on both successes and failures.
</summary>
</histogram>
<histogram
name="Media.EME.MediaFoundationCdm.Widevine.HardwareSecure.Initialize"
enum="Hresult" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
HRESULT of MediaFoundationCdm initialization when using Widevine in hardware
secure mode. Only reported on failures.
</summary>
</histogram>
<histogram name="Media.EME.MediaFoundationCdm.Widevine.HardwareSecure.{EmeApi}"
enum="Hresult" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
HRESULT of MediaFoundationCdm and MediaFoundationCdmSession operations when
using Widevine in hardware secure mode.
</summary>
<token key="EmeApi" variants="EmeApi"/>
</histogram>
<histogram name="Media.EME.MediaFoundationService.Crash2"
enum="BooleanAfterPowerOrDisplayChange" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether a MediaFoundationService process crash is within 5 seconds after
power or display change. Reported when the MediaFoundationService process
crashes.
</summary>
</histogram>
<histogram
name="Media.EME.MediaFoundationService.ErrorAfterPowerOrDisplayChange2"
enum="Hresult" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
HRESULTs associated with errors happened in the MediaFoundationService
process within 5 seconds after power or display change.
</summary>
</histogram>
<histogram
name="Media.EME.MediaFoundationService.ErrorNotAfterPowerOrDisplayChange2"
enum="Hresult" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
HRESULTs associated with errors happened in the MediaFoundationService
process NOT within 2 seconds after power or display change.
</summary>
</histogram>
<histogram name="Media.EME.MediaFoundationService.HardwareContextReset"
enum="BooleanAfterPowerOrDisplayChange" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether a HardwareContextReset event happened in the MediaFoundationService
process within 5 seconds after power or display change. Reported whenever
such an event happens.
</summary>
</histogram>
<histogram name="Media.EME.MediaFoundationService.IsKeySystemSupported"
units="ms" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Time for MediaFoundationService.IsKeySystemSupported() to finish. Reported
once per browser session lifetime.
</summary>
</histogram>
<histogram
name="Media.EME.MediaFoundationService.Widevine.HardwareSecure.IsTypeSupported"
units="ms" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Time for IMFContentDecryptionModuleFactory::IsTypeSupported() to finish in
MediaFoundationService when using Widevine in hardware secure mode, which
are called by MediaFoundationService.IsKeySystemSupported() (called once per
browser session lifetime). IsKeySystemSupported() calls IsTypeSupported()
multiple times, for different audio/video codecs and encryption schemes.
</summary>
</histogram>
<histogram name="Media.EME.MediaLicenseDatabaseCreateDirectoryError"
enum="PlatformFileError" expires_after="2024-04-11">
<owner>vpasupathy@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Platform File specific errors reported while attempting to open the Media
License Database.
</summary>
</histogram>
<histogram name="Media.EME.MediaLicenseDatabaseOpenQuotaError"
enum="QuotaError" expires_after="2024-04-11">
<owner>vpasupathy@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Quota errors reported while attempting to unsuccessfully open the Media
License Database.
</summary>
</histogram>
<histogram name="Media.EME.MediaLicenseDatabaseOpenSQLiteError"
enum="SqliteLoggedResultCode" expires_after="2024-04-11">
<owner>vpasupathy@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
SQLite specific errors reported while attempting to unsuccessfully open the
Media License Database.
</summary>
</histogram>
<histogram name="Media.EME.MediaLicenseDatabaseSQLiteError"
enum="SqliteLoggedResultCode" expires_after="2024-04-11">
<owner>vpasupathy@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
SQLite specific errors reported while opening and using the Media License
Database.
</summary>
</histogram>
<histogram name="Media.EME.MediaLicenseStorageHostOpenError"
enum="MediaLicenseStorageHostOpenError" expires_after="2024-04-11">
<obsolete>
Deprecated in favor for Media.EME.MediaLicenseStorageHostOpenError.Incognito
and Media.EME.MediaLicenseStorageHostOpenError.NotIncognito in 2/2023.
</obsolete>
<owner>vpasupathy@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
General errors reported while attempting to open the MediaLicenseDatabase.
</summary>
</histogram>
<histogram name="Media.EME.MediaLicenseStorageHostOpenError.Incognito"
enum="MediaLicenseStorageHostOpenError" expires_after="2024-04-11">
<owner>vpasupathy@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
General errors reported while attempting to open the MediaLicenseDatabase.
This UMA further breaks down the UMA above by only reporting errors if the
media license storage host error occurs during an incognito process.
</summary>
</histogram>
<histogram name="Media.EME.MediaLicenseStorageHostOpenError.NotIncognito"
enum="MediaLicenseStorageHostOpenError" expires_after="2024-04-11">
<owner>vpasupathy@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
General errors reported while attempting to open the MediaLicenseDatabase.
This UMA further breaks down the UMA above by only reporting errors if the
media license storage host error occurs during a non incognito process.
</summary>
</histogram>
<histogram name="Media.EME.MojoCdm.ConnectionError"
enum="BooleanConnectionError" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether connection error has happened for MojoCdm. Every time a MojoCdm
object is created a &quot;false&quot; value is reported to provide a
baseline. Every time a mojo connection error happened, a &quot;true&quot;
value will be reported, which typically means a remote CDM process crash.
</summary>
</histogram>
<histogram name="Media.EME.OutputProtection" enum="MediaOutputProtectionStatus"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Output protection query status and result. One query and one positive (no
unprotected external links) result (if any) are reported per CDM instance.
</summary>
</histogram>
<histogram name="Media.EME.OutputProtection.PlatformCdm"
enum="MediaOutputProtectionStatus" expires_after="2022-01-15">
<owner>jkardatzke@chromium.org</owner>
<owner>cros-gfx-video@google.com</owner>
<summary>
Output protection query status and result. One query and one positive (no
unprotected external links) result (if any) are reported per CDM instance.
</summary>
</histogram>
<histogram name="Media.EME.RequestMediaKeySystemAccess.{KeySystem}"
enum="RequestMediaKeySystemAccessStatus" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
{KeySystem} support query status and result, as reported by
RequestMediaKeySystemAccess. Each value will be reported at most once per
renderer process.
</summary>
<token key="KeySystem" variants="KeySystem"/>
</histogram>
<histogram name="Media.EME.UrlProvisionFetcher.ResponseCode"
enum="CombinedHttpResponseAndNetErrorCode" expires_after="2024-04-11">
<owner>jrummell@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The net error or HTTP response code of provisioning requests made by
UrlProvisionFetcher on Android and Cast devices.
</summary>
</histogram>
<histogram name="Media.EME.Widevine.HardwareSecure.CdmInfoStatus"
enum="CdmInfoStatus" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The CdmInfo::Status of Widevine hardware secure CDM capability. Reported at
most once per browser session when EME query is triggered by a website.
</summary>
</histogram>
<histogram
name="Media.EME.Widevine.HardwareSecure.ClearLeadSupport.{VideoCodec}"
enum="BooleanSupported" expires_after="2024-04-11">
<owner>vpasupathy@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Record for whether clear lead content is supported by the platform for
hardware security. This is reported only on Windows devices, only when codec
is supported for hardware security, per codec, and once per browser session
lifetime.
</summary>
<token key="VideoCodec" variants="VideoCodec"/>
</histogram>
<histogram name="Media.EME.Widevine.HardwareSecure.Pref" enum="BooleanEnabled"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether Media Foundation Widevine CDM is enabled or disabled based on
previous disabled timestamps in &quot;Local State&quot; pref. This is
reported once per browsing session around browser startup time if Media
Foundation Widevine CDM is enabled and available.
</summary>
</histogram>
<histogram name="Media.EME.Widevine.HardwareSecure.Support"
enum="BooleanSupported" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
When hardware secure decryption is enabled, whether Widevine hardware secure
decryption is actually supported by the platform (device). Reported at most
once per browser session when EME query is triggered by a website, and when
Widevine hardware secure CDM was registered.
</summary>
</histogram>
<histogram name="Media.EME.Widevine.HardwareSecure.Support.{VideoCodec}"
enum="BooleanSupported" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
When hardware secure decryption is enabled and supported by Widevine,
whether {VideoCodec} video codec is supported by the platform (device).
Reported at most once per browser session when EME query is triggered by a
website, and when Widevine hardware secure CDM was registered.
</summary>
<token key="VideoCodec" variants="VideoCodec"/>
</histogram>
<histogram name="Media.EME.Widevine.SoftwareSecure.SystemCode"
enum="CdmSystemCode" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
System code in promise rejection when using Widevine key system in software
secure mode.
</summary>
</histogram>
<histogram name="Media.EME.Widevine.VideoCapability.HasEmptyRobustness"
enum="BooleanEmpty" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether the robustness level of any video capability in the supported
configuration passed into requestMediaKeySystemAccess() is empty. This is
specific to the Widevine key system.
</summary>
</histogram>
<histogram name="Media.EME.{KeySystem}.CreateCdm" enum="BooleanSuccess"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether the CDM instance is created successfully for {KeySystem}. Reported
each time a CDM instance creation is attempted, usually as a result of
Javascript call of createMediaKeys().
</summary>
<token key="KeySystem" variants="KeySystemWithRobustness"/>
</histogram>
<histogram name="Media.EME.{KeySystem}.CreateCdmTime" units="ms"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>Time took to create the CDM instance for {KeySystem}.</summary>
<token key="KeySystem" variants="KeySystemWithRobustness"/>
</histogram>
<histogram name="Media.EME.{KeySystem}.CreateSession.SessionType"
enum="EmeSessionType" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>EME session type passed into CreateSession.</summary>
<token key="KeySystem" variants="KeySystemWithRobustness"/>
</histogram>
<histogram name="Media.EME.{KeySystem}.GenerateRequest.MojoCdmTimeout"
enum="CallbackTimeoutStatus" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The timeout status of MojoCdm::CreateSessionAndGenerateRequest() call.
</summary>
<token key="KeySystem" variants="KeySystemWithRobustness"/>
</histogram>
<histogram name="Media.EME.{KeySystem}.InitialKeyStatusMix"
enum="CdmKeyStatusMix" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Reports a summary of key statuses associated with an EME CDM session.
Reported once per EME CDM session on the first key statuses update.
</summary>
<token key="KeySystem" variants="KeySystemWithRobustness"/>
</histogram>
<histogram name="Media.EME.{KeySystem}.KeyStatusSystemCode"
enum="CdmSystemCode" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>System code associated with key status for {KeySystem}.</summary>
<token key="KeySystem" variants="KeySystemWithRobustness"/>
</histogram>
<histogram name="Media.EME.{KeySystem}.LibraryCdmAvailable"
enum="BooleanAvailable" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether the CDM is available for {KeySystem} or not. In normal cases, this
is reported once per render process if the EME API is used. In rare cases it
could be reported more than once if the CDM is not available and then is
component updated.
</summary>
<token key="KeySystem" variants="KeySystem"/>
</histogram>
<histogram name="Media.EME.{KeySystem}.TimeTo{ResolveOrReject}.{EmeApi}"
units="ms" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>The time it takes to {ResolveOrReject} a EME promise.</summary>
<token key="KeySystem" variants="KeySystemWithRobustness"/>
<token key="ResolveOrReject" variants="ResolveOrReject"/>
<token key="EmeApi" variants="EmeApi"/>
</histogram>
<histogram name="Media.EME.{KeySystem}.{EmeApi}" enum="CdmPromiseResult"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>Result of EME promises that were handled by Chromium code.</summary>
<token key="KeySystem" variants="KeySystemWithRobustness"/>
<token key="EmeApi" variants="EmeApi"/>
</histogram>
<histogram name="Media.EME.{KeySystem}.{EmeApi}.SystemCode"
enum="CdmSystemCode" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>System code in promise rejection.</summary>
<token key="KeySystem" variants="KeySystemWithRobustness"/>
<token key="EmeApi" variants="EmeApi"/>
</histogram>
<histogram name="Media.Engagement.ScoreAtPlayback" units="%"
expires_after="M82">
<owner>beccahughes@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The media engagement score recorded at the time of playback. It is converted
to a percentage so should be divided by 100 to get the actual score. It is
only recorded for playback that is either lacking an audio track or not
muted.
</summary>
</histogram>
<histogram
name="Media.Engagement.SignificantPlayers.PlayerNotAdded.AfterFirstTime"
enum="InsignificantPlaybackReason" expires_after="M82">
<owner>beccahughes@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Recorded when the Media Engagement service doesn't determine a player to be
significant. If a player is not significant the reasons why will be
individually recorded to this histogram each time except for the first time
which is recorded to a different histogram.
The significant state of a player is reevaluated any time the state of the
player changes (e.g. muted, playing/paused). If the player was not
considered signficiant and still is not then we will record the reasons why
in this histogram.
</summary>
</histogram>
<histogram name="Media.Engagement.SignificantPlayers.PlayerNotAdded.FirstTime"
enum="InsignificantPlaybackReason" expires_after="M82">
<owner>beccahughes@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Recorded when the Media Engagement service doesn't determine a player to be
significant. If a player is not significant the reasons why will be
individually recorded to this histogram the first time only.
The significant state of a player is reevaluated any time the state of the
player changes (e.g. muted, playing/paused). If the player was not
considered signficiant and still is not then we will record the reasons why
in this histogram.
</summary>
</histogram>
<histogram name="Media.Engagement.SignificantPlayers.PlayerRemoved"
enum="InsignificantPlaybackReason" expires_after="M77">
<owner>beccahughes@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Recorded when the Media Engagement service no longer determines a player to
be significant. If a player is no longer significant, the reasons why will
be individually recorded to this histogram.
The significant state of a player is re-evaluted any time the state of the
player changes (e.g. muted, playing/paused). If the player was previously
considered significant and is no longer considered that we will record the
reasons why in this histogram.
</summary>
</histogram>
<histogram name="Media.FallbackToHighLatencyAudioPath"
enum="BooleanDidFallBack" expires_after="never">
<!-- expires-never: Media pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Whether Chrome had to fallback to the high latency audio path or not.
</summary>
</histogram>
<histogram name="Media.FrameReadBackCount.{RendererType}" units="frames"
expires_after="2023-09-08">
<owner>dalecurtis@chromium.org</owner>
<owner>frankli@microsoft.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Monitors the number of video frames being read back from a {RendererType}.
It is the count of video frames being read back from an HTML5 video when it
is unloaded.
</summary>
<token key="RendererType" variants="RendererType"/>
</histogram>
<histogram name="Media.GetDisplayMedia.Constraints.DisplaySurface"
enum="GetDisplayMediaConstraintsDisplaySurface" expires_after="2023-11-12">
<owner>eladalon@chromium.org</owner>
<owner>fbeaufort@chromium.org</owner>
<summary>
Records whether getDisplayMedia was called with the displaySurface
constraint.
</summary>
</histogram>
<histogram name="Media.GetDisplayMedia.Constraints.SelfBrowserSurface"
enum="GetDisplayMediaIncludeExcludeConstraint" expires_after="2023-05-07">
<owner>eladalon@chromium.org</owner>
<owner>fbeaufort@chromium.org</owner>
<summary>
Records whether getDisplayMedia was called with the selfBrowserSurface
constraint.
</summary>
</histogram>
<histogram name="Media.GetDisplayMedia.Constraints.SuppressLocalAudioPlayback"
enum="GetDisplayMediaBooleanConstraint" expires_after="2023-05-07">
<owner>eladalon@chromium.org</owner>
<owner>fbeaufort@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Records whether getDisplayMedia was called with the
suppressLocalAudioPlayback constraint.
</summary>
</histogram>
<histogram name="Media.GetDisplayMedia.Constraints.SurfaceSwitching"
enum="GetDisplayMediaIncludeExcludeConstraint" expires_after="2023-05-07">
<owner>eladalon@chromium.org</owner>
<owner>fbeaufort@chromium.org</owner>
<summary>
Records whether getDisplayMedia was called with the surfaceSwitching
constraint.
</summary>
</histogram>
<histogram name="Media.GetDisplayMedia.Constraints.SystemAudio"
enum="GetDisplayMediaIncludeExcludeConstraint" expires_after="2023-10-15">
<owner>eladalon@chromium.org</owner>
<owner>fbeaufort@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Records whether getDisplayMedia was called with the systemAudio constraint.
</summary>
</histogram>
<histogram name="Media.GetDisplayMedia.RequiresUserActivationResult"
enum="GetDisplayMediaTransientActivation" expires_after="2024-03-14">
<owner>eladalon@chromium.org</owner>
<owner>fbeaufort@chromium.org</owner>
<owner>hendrich@chromium.org</owner>
<summary>
Records whether getDisplayMedia was called with a user gesture (transient
activation) or whether it wasn't required. The requirement is only enforced
once `blink::features::kGetDisplayMediaRequiresUserActivation` is enabled
and can be bypassed with the `ScreenCaptureWithoutGestureAllowedForOrigins`
policy.
</summary>
</histogram>
<histogram name="Media.GlobalMediaControls.DeviceSelectorAvailable"
enum="Boolean" expires_after="2023-02-12">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records if the Global Media Controls device selector was available. Recorded
once per notification either when the device selector was shown or when the
notification disappears.
</summary>
</histogram>
<histogram name="Media.GlobalMediaControls.DeviceSelectorOpened" enum="Boolean"
expires_after="2023-10-22">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records if the Global Media Controls device selector was opened. Recorded
once per notification either when the device selector was opened or when the
notification disappears. This histogram is only recorded if the device
selector was available.
</summary>
</histogram>
<histogram name="Media.GlobalMediaControls.DismissReason"
enum="GlobalMediaControlsDismissReason" expires_after="2023-01-01">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Recorded each time a media session is dismissed or removed from the Global
Media Controls. Records the reason why it happened (e.g. user clicked the
dismiss button or playback stopped).
</summary>
</histogram>
<histogram name="Media.GlobalMediaControls.EntryPoint"
enum="GlobalMediaControlsEntryPoint" expires_after="2023-10-22">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records the entry point whenever the user opens the Global Media Controls
UI.
</summary>
</histogram>
<histogram name="Media.GlobalMediaControls.HasDefaultPresentationRequest"
enum="Boolean" expires_after="2022-11-27">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records whether a media session is from a WebContents with a default
PresentationReuqest. Recorded whenever a session is instantiated in the
global media controls, even if the user doesn't open the UI to view it.
</summary>
</histogram>
<histogram name="Media.GlobalMediaControls.InteractionDelayAfterPause"
units="ms" expires_after="2022-07-03">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Recorded each time a paused media session is interacted with (e.g. playing
the media or clicking on the notification to go back to the tab). Records
the time passed since it was last interacted with (or since when it was
paused if this is the first post-pause interaction).
</summary>
</histogram>
<histogram name="Media.GlobalMediaControls.MediaCastMode.{Action}"
enum="GlobalMediaControlsCastMode" expires_after="2023-09-20">
<owner>muyaoxu@google.com</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Records the type of Media Route that users {Action} from the Global Media
Controls dialog. Recorded when users click on a button and this histogram
doesn't represent the actual number of sessions {Action}ed from the GMC
dialog.
</summary>
<token key="Action">
<variant name="Start" summary="start"/>
<variant name="Stop" summary="stop"/>
</token>
</histogram>
<histogram name="Media.GlobalMediaControls.NumberOfAvailableAudioDevices"
units="devices" expires_after="2022-12-04">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Recorded each time the Global Media Controls Device picker dialog is opened
and is populated with devices. Records the number of device options
displayed, possibly including the default fallback device.
</summary>
</histogram>
<histogram name="Media.GlobalMediaControls.RepeatUsage" enum="BooleanIsRepeat"
expires_after="2023-09-24">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Recorded each time the Global Media Controls dialog is opened. True if this
was repeat usage of the dialog (e.g. if it's not the first time the dialog
has been opened this session).
</summary>
</histogram>
<histogram name="Media.GlobalMediaControls.UserActionFocus"
enum="BooleanFocused" expires_after="2023-10-01">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The focused state of the WebContents associated with the MediaSession that
the user is interacting with via the Global Media Controls. Recorded when
the user presses an action on the Global Media Controls dialog (e.g. play).
</summary>
</histogram>
<histogram name="Media.GPU.HasEverLostContext" enum="ContextProviderPhase"
expires_after="M77">
<owner>dcastagna@chromium.org</owner>
<summary>
Records when a context provider is acquired in media, and when it's released
because a context loss has been detected.
</summary>
</histogram>
<histogram name="Media.GPU.OutputFormat" enum="OutputFormat"
expires_after="2023-12-01">
<owner>hitawala@chromium.org</owner>
<owner>vasilyt@chromium.org</owner>
<owner>shared-image-team@google.com</owner>
<summary>
Records the format used for creating video frames with GpuMemoryBuffers.
Result is an enum that represents OutputFormat in
GpuVideoAcceleratorFactoriesImpl. Recorded once per VideoFrame creation.
</summary>
</histogram>
<histogram name="Media.GPU.VideoDecoderType" enum="VideoDecoderType"
expires_after="2023-10-01">
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records the VideoDecoderType used for GPU based video decoding. Recorded
once per GPU mojo media client creation (~once per GPU process).
</summary>
</histogram>
<histogram name="Media.GpuArcVideoDecodeAccelerator.InitializeResult"
enum="ArcVideoDecodeAcceleratorResult" expires_after="2021-02-18">
<owner>andrescj@chromium.org</owner>
<owner>chromeos-gfx-video@google.com</owner>
<summary>
Counts of status values returned from calls to
GpuArcVideoDecodeAccelerator::Initialize().
</summary>
</histogram>
<histogram name="Media.GpuArcVideoDecodeAccelerator.InstanceCount.All"
units="instances" expires_after="2023-01-22">
<owner>andrescj@chromium.org</owner>
<owner>chromeos-gfx-video@google.com</owner>
<summary>
Counts how many GpuArcVideoDecodeAccelerator instances are alive at the time
a new GpuArcVideoDecodeAccelerator is created.
</summary>
</histogram>
<histogram name="Media.GpuArcVideoDecodeAccelerator.InstanceCount.Initialized"
units="instances" expires_after="2023-01-22">
<owner>andrescj@chromium.org</owner>
<owner>chromeos-gfx-video@google.com</owner>
<summary>
Counts how many GpuArcVideoDecodeAccelerator instances that have gone
through initialization (i.e., have an underlying
media::VideoDecodeAccelerator) are alive at the time a
GpuArcVideoDecodeAccelerator goes through initialization and successfully
creates its underlying media::VideoDecodeAccelerator.
</summary>
</histogram>
<histogram name="Media.GpuMemoryBufferVideoFramePool.UnsupportedFormat"
enum="VideoPixelFormatUnion" expires_after="2023-10-08">
<owner>magchen@chromium.org</owner>
<owner>mcasas@chromium.org</owner>
<summary>
GpuMemoryBufferVideoFramePool is called with an unsupported VideoFrame pixel
format. Emitted on VideoFrame arrival.
</summary>
</histogram>
<histogram name="Media.GpuVideoFrameFactory.SharedContextStateResult"
enum="ContextResult" expires_after="2019-06-01">
<owner>vikassoni@chromium.org</owner>
<owner>liberato@chromium.org</owner>
<summary>
The error code returned when GetSharedContextState() fails or MakeCurrent()
on the SharedContextState fails.
</summary>
</histogram>
<histogram name="Media.HardwareAudioChannelCount" units="units"
expires_after="never">
<!-- expires-never: Media platform support planning metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>Channel count of the hardware audio device.</summary>
</histogram>
<histogram name="Media.HardwareAudioChannelLayout" enum="ChannelLayout"
expires_after="never">
<!-- expires-never: Media platform support planning metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>Channel layout of the hardware audio device.</summary>
</histogram>
<histogram name="Media.HardwareAudioSamplesPerSecond" enum="AudioSampleRate"
expires_after="never">
<!-- expires-never: Media platform support planning metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>Samples per second of the hardware audio device.</summary>
</histogram>
<histogram name="Media.HardwareKeyPressed" enum="MediaHardwareKeyAction"
expires_after="2021-08-29">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records media key presses that are handled by the
HardwareKeyMediaController.
</summary>
</histogram>
<histogram name="Media.HasAcceleratedVideoDecode.{CodecType}"
enum="BooleanSupported" expires_after="2023-12-01">
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Tracks accelerated video decoding support for a given codec. Recorded once
per GPU process after an attempt to use accelerated video decoding.
</summary>
<token key="CodecType">
<variant name="AV1"/>
<variant name="H264"/>
<variant name="H265"/>
<variant name="VP9"/>
</token>
</histogram>
<histogram name="Media.HasEverPlayed" enum="BooleanHasPlayed"
expires_after="never">
<!-- expires-never: Media pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether a given WebMediaPlayer instance, after preload, started playback;
recorded once at time of player destruction.
</summary>
</histogram>
<histogram base="true" name="Media.InitialDecoderSelectionTime" units="ms"
expires_after="2023-03-25">
<obsolete>
Removed 02/2023 due to lack of further need for this data.
</obsolete>
<owner>cassew@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Duration of initial decoder selection. Measured from first call to
'DecoderSelector::SelectDecoder' to 'DecoderSelector::FinalizeSelection'.
The HW/SW suffix indicates the type of the decoder that was ultimately
selected.
</summary>
</histogram>
<histogram name="Media.InputErrorMac" enum="OSStatus_Audio"
expires_after="never">
<!-- expires-never: essential indicator for audio input stability in Chrome -->
<owner>olka@chromium.org</owner>
<owner>fhernqvist@google.com</owner>
<owner>henrika@hromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Error codes that we encounter while setting up an AUAudioInputStream on Mac.
</summary>
</histogram>
<histogram name="Media.InputStreamDuration" units="ms" expires_after="never">
<!-- expires-never: essential indicator for audio input stability in Chrome -->
<owner>henrika@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Duration in milliseconds of low-latency audio input streams. Sampled when
the stream is closed by the AudioInputController.
</summary>
</histogram>
<histogram name="Media.InputStreamDurationWithoutCallback" units="ms"
expires_after="2023-10-22">
<owner>olka@chromium.org</owner>
<owner>henrika@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Duration in milliseconds of low-latency audio input streams which never got
any callbacks. Warning: this histogram was expired from 2020-10-11 to
2021-06-04; data may be missing.
</summary>
</histogram>
<histogram base="true" name="Media.Learning.BinaryThreshold.Aggregate"
enum="ConfusionMatrix" expires_after="2019-10-30">
<!-- Name completed by histogram_suffixes
name="Media.Learning.BinaryThreshold" -->
<owner>liberato@chromium.org</owner>
<owner>chcunningham@chromium.org</owner>
<summary>
Confusion matrix for UMA-reported regresssion tasks for media local learning
experiments. Each bucket is interpreted as follows:
TrueNegative - prediction was negative, observation was negative.
FalseNegative - prediction was negative, observation was positive.
FalsePositive - prediction was positive, observation was negative.
TruePositive - prediction was positive, observation was positive.
For those observations for which we could not make a prediction due to data
sparsity, the &quot;no-prediction&quot; buckets indicate whether the
observation was positive or negative.
</summary>
</histogram>
<histogram base="true" name="Media.Learning.BinaryThreshold.ByFeature"
enum="MegaConfusionMatrix" expires_after="2019-10-30">
<!-- Name completed by histogram_suffixes
name="Media.Learning.BinaryThreshold" -->
<owner>liberato@chromium.org</owner>
<owner>chcunningham@chromium.org</owner>
<summary>
Confusion matrices, split out by the feature index used to train the model.
Each confusion matrix has 6 entries:
TrueNegative - prediction was negative, observation was negative.
FalseNegative - prediction was negative, observation was positive.
FalsePositive - prediction was positive, observation was negative.
TruePositive - prediction was positive, observation was positive.
No-prediction Negative - no prediction made, observation was negative.
No-prediction Positive - no prediction made, observation was positive.
The confusion matrix entry will also be labelled with a bucket number, which
for this histogram represents the index of the feature that was used. The
feature index matches |LearningTask::feature_descriptions| for the
appropriate task.
</summary>
</histogram>
<histogram base="true" name="Media.Learning.BinaryThreshold.ByTrainingWeight"
enum="MegaConfusionMatrix" expires_after="2020-02-02">
<!-- Name completed by histogram_suffixes
name="Media.Learning.BinaryThreshold" -->
<owner>liberato@chromium.org</owner>
<owner>chcunningham@chromium.org</owner>
<summary>
Confusion matrices, split out by the total amount of training data used to
train the model. Each confusion matrix has 6 entries:
TrueNegative - prediction was negative, observation was negative.
FalseNegative - prediction was negative, observation was positive.
FalsePositive - prediction was positive, observation was negative.
TruePositive - prediction was positive, observation was positive.
No-prediction Negative - no prediction made, observation was negative.
No-prediction Positive - no prediction made, observation was positive.
The bucket number mentioned in the enum label indicates how much weight the
training set had. To convert from bucket number to an actual weight range,
one must know the particular settings in the corresponding LearningTask.
Please see |LearningTask::max_reporting_weight| and
|LearningTask::num_reporting_weight_buckets| for the the appropriate task.
</summary>
</histogram>
<histogram name="Media.LoadType" enum="MediaLoadType"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Load type of HTML5 media, such as URL, MediaSource and MediaStream.
</summary>
</histogram>
<histogram name="Media.LocalRendererSinkStates" enum="LocalRendererSinkStates"
expires_after="2018-08-30">
<owner>Please list the metric's owners. Add more owner tags as needed.</owner>
<summary>
State of the WebRtc local renderer, sampled once during the lifetime of a
local renderer.
</summary>
</histogram>
<histogram name="Media.LockScreenControls.Hidden"
enum="LockScreenMediaControlsHideReason" expires_after="2022-05-01">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The reason why the lock screen media controls were hidden if they were
previously shown. Recorded when the controls are destroyed by the lock
screen (e.g. unlock, switch user, shutdown). Warning: this histogram was
expired from 2020-01-31 to 2021-11-30; data may be missing.
</summary>
</histogram>
<histogram name="Media.LockScreenControls.Shown"
enum="LockScreenMediaControlsShown" expires_after="2022-05-01">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether the lock screen media controls were shown and if they will not be
shown the reason why. Warning: this histogram was expired from 2020-01-31 to
2021-11-30; data may be missing.
</summary>
</histogram>
<histogram name="Media.LockScreenControls.UserAction" enum="MediaSessionAction"
expires_after="2022-05-01">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The action (e.g. pause) that a user clicked on the lock screen media
controls. Warning: this histogram was expired from 2020-01-31 to 2021-11-30;
data may be missing.
</summary>
</histogram>
<histogram name="Media.LowLatencyAudioCaptureStartupSuccess"
enum="AudioCaptureStartupResult" expires_after="2023-11-05">
<owner>armax@chromium.org</owner>
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<summary>
Whether capture started successfully after a low-latency input stream
startup was requested.
</summary>
</histogram>
<histogram name="Media.MCVD.ForwardVideoFrameTiming" units="ms"
expires_after="2020-10-11">
<owner>liberato@chromium.org</owner>
<owner>sandersd@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<summary>
The time between MediaCodec::dequeueOutputBuffer() and the dispatch of the
corresponding VideoFrame from MediaCodecVideoDecoder.
</summary>
</histogram>
<histogram name="Media.MeanTimeBetweenRebuffers" units="ms"
expires_after="2023-10-01">
<owner>dalecurtis@chromium.org</owner>
<summary>
The total watch time (see Media.WatchTime) of a given playback divided by
the number of rebuffering events that occured during that playback. Only
reported when rebuffering happened. Therefore, alway refer to other UMAs
like `Media.RebuffersCount` when checking this UMA.
</summary>
</histogram>
<histogram name="Media.MediaDevices.EnumerateDevices.Latency" units="ms"
expires_after="2023-11-12">
<owner>toprice@chromium.org</owner>
<owner>agpalak@chromium.org</owner>
<summary>
The latency of calls to the navigator.mediaDevices.enumerateDevices() API
which resolve, including both successes and failures. Note very long calls
which record a EnumerateDevices.Result of kTimedOut but do eventually
resolve will have their latency recorded.
</summary>
</histogram>
<histogram name="Media.MediaDevices.EnumerateDevices.Result"
enum="EnumerateDevicesResult" expires_after="2023-11-12">
<owner>toprice@chromium.org</owner>
<owner>agpalak@chromium.org</owner>
<summary>
The results of all calls to the navigator.mediaDevices.enumerateDevices()
API, including successful promise resolutions, error codes, or kTimedOut, if
the promise was still pending after 4 seconds.
</summary>
</histogram>
<histogram name="Media.MediaDevices.GetDisplayMedia.Latency" units="ms"
expires_after="2023-11-19">
<owner>toprice@chromium.org</owner>
<owner>agpalak@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<summary>
The latency of calls to the navigator.mediaDevices.GetDisplayMedia() API
which resolve, including both successes and failures. Note very long calls
which record a GetDisplayMedia.Result of kTimedOut but do eventually resolve
will have their latency recorded.
</summary>
</histogram>
<histogram name="Media.MediaDevices.GetDisplayMedia.Result"
enum="UserMediaRequestResult" expires_after="2023-11-19">
<owner>toprice@chromium.org</owner>
<owner>agpalak@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<summary>
The results of all calls to the navigator.mediaDevices.GetDisplayMedia()
API, including successful promise resolutions, error codes, or kTimedOut, if
the promise was still pending after 6 seconds.
</summary>
</histogram>
<histogram name="Media.MediaDevices.GetDisplayMediaSet.Latency" units="ms"
expires_after="2023-05-01">
<owner>simonha@google.com</owner>
<owner>video-cmi-apis@google.com</owner>
<summary>
The latency of calls to the navigator.mediaDevices.GetDisplayMediaSet() API
which resolve, including both successes and failures. Note very long calls
which record a GetDisplayMediaSet.Result of kTimedOut but do eventually
resolve will have their latency recorded.
</summary>
</histogram>
<histogram name="Media.MediaDevices.GetDisplayMediaSet.Result"
enum="UserMediaRequestResult" expires_after="2023-05-01">
<owner>simonha@google.com</owner>
<owner>video-cmi-apis@google.com</owner>
<summary>
The results of all calls to the navigator.mediaDevices.GetDisplayMediaSet()
API, including successful promise resolutions, error codes, or kTimedOut, if
the promise was still pending after 6 seconds.
</summary>
</histogram>
<histogram name="Media.MediaDevices.GetUserMedia.Latency" units="ms"
expires_after="2023-11-12">
<owner>toprice@chromium.org</owner>
<owner>agpalak@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<summary>
The latency of calls to the navigator.mediaDevices.GetUserMedia() API which
resolve, including both successes and failures. Note very long calls which
record a GetUserMedia.Result of kTimedOut but do eventually resolve will
have their latency recorded.
</summary>
</histogram>
<histogram name="Media.MediaDevices.GetUserMedia.Result"
enum="UserMediaRequestResult" expires_after="2023-11-12">
<owner>toprice@chromium.org</owner>
<owner>agpalak@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<summary>
The results of all calls to the navigator.mediaDevices.GetUserMedia() API,
including successful promise resolutions, error codes, or kTimedOut, if the
promise was still pending after 8 seconds.
</summary>
</histogram>
<histogram name="Media.MediaDevicesManager.VideoDeviceEnumeration.Result"
enum="DeviceEnumerationResult" expires_after="2023-11-12">
<owner>toprice@chromium.org</owner>
<owner>agpalak@chromium.org</owner>
<summary>
The success or failure code of MediaDevicesManager requests to enumerate
video devices (ie cameras) with the camera capture service.
</summary>
</histogram>
<histogram name="Media.MediaDevicesManager.VideoDeviceEnumeration.Start"
enum="Boolean" expires_after="2024-05-01">
<owner>toprice@chromium.org</owner>
<owner>agpalak@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<summary>
Count of MediaDevicesManager starting enumerating video devices (ie cameras)
with the camera capture service, including enumerations which never
finished.
</summary>
</histogram>
<histogram name="Media.MediaElement.ContentTypeParseable"
enum="ContentTypeParseableResult" expires_after="2022-07-03">
<obsolete>
Removed 07/2022 due to lack of further need for this data.
</obsolete>
<owner>jrummell@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether the content type provided to HTMLMediaElement would parse with
ParsedContentType or not.
</summary>
</histogram>
<histogram name="Media.MediaFoundation.VideoColorSpace.PrimaryID"
enum="VideoColorSpace.PrimaryID" expires_after="2023-08-27">
<owner>dalecurtis@chromium.org</owner>
<owner>macrabil@microsoft.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Recorded when the VideoColorSpace VideoPrimaries value is passed to
MediaFoundation for HDR content.
</summary>
</histogram>
<histogram name="Media.MediaFoundation.VideoColorSpace.TransferID"
enum="VideoColorSpace.TransferID" expires_after="2023-08-02">
<owner>dalecurtis@chromium.org</owner>
<owner>wicarr@microsoft.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Recorded when the VideoColorSpace TransferFunction value is passed to
MediaFoundation for HDR content.
</summary>
</histogram>
<histogram name="Media.MediaFoundationRenderer.CreateMediaEngineError"
enum="Hresult" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Recorded when the MediaFoundationRenderer::CreateMediaEngine() fails.
</summary>
</histogram>
<histogram name="Media.MediaFoundationRenderer.ErrorReason"
enum="MediaFoundationRendererErrorReason" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Recorded when the MediaFoundationRenderer or MediaFoundationRendererClient
hits an error.
</summary>
</histogram>
<histogram name="Media.MediaFoundationRenderer.FailedToSetDCompMode"
enum="Hresult" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Recorded when the MediaFoundationRenderer hits an error when trying to set
direct composition mode.
</summary>
</histogram>
<histogram
name="Media.MediaFoundationRenderer.InvalidHwdrmState.HasReportedPlaying"
enum="Boolean" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether or not playback has started when DRM_E_TEE_INVALID_HWDRM_STATE
happens in MediaFoundationRenderer.
</summary>
</histogram>
<histogram
name="Media.MediaFoundationRenderer.InvalidHwdrmState.VideoFrameDecoded"
units="frames" expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The number of video frames decoded when DRM_E_TEE_INVALID_HWDRM_STATE
happens in MediaFoundationRenderer.
</summary>
</histogram>
<histogram name="Media.MediaFoundationRenderer.PlaybackError" enum="Hresult"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Recorded when the MediaFoundationRenderer hits a playback error. Some errors
are part of the normal user flow (e.g. sleep/resume) and are not a bug.
</summary>
</histogram>
<histogram name="Media.MediaKeysListener.RegisterHotKeyResult"
enum="BooleanSuccess" expires_after="M82">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether or not the MediaKeysListener was able to successfully register a hot
key. Failure typically indicates that the hotkey was already registered by a
different application.
</summary>
</histogram>
<histogram name="Media.MediaRecorder.Codec" enum="MediaRecorderCodec"
expires_after="2023-10-08">
<owner>clarissagarvey@chromium.org</owner>
<owner>mcasas@chromium.org</owner>
<summary>
The codec and hardware/software variant used by MediaRecorder, recorded once
when the VideoTrackRecorder initializes the encoder.
</summary>
</histogram>
<histogram name="Media.MediaRecorder.VEAUsed" enum="MediaRecorderVEAUsed"
expires_after="M95">
<owner>mcasas@chromium.org</owner>
<owner>wtlee@chromium.org</owner>
<summary>Whether HW video encode is used in MediaRecorder.</summary>
</histogram>
<histogram name="Media.MediaStreamManager.DesktopVideoDeviceUpdate"
enum="MediaStreamRequestResult2" expires_after="2023-07-16">
<owner>eladalon@chromium.org</owner>
<owner>tovep@chromium.org</owner>
<summary>
Records media stream request responses for desktop-video capture
media-device-update requests.
</summary>
</histogram>
<histogram name="Media.MediaStreamManager.DisplayVideoDeviceUpdate"
enum="MediaStreamRequestResult2" expires_after="2023-09-17">
<owner>eladalon@chromium.org</owner>
<owner>tovep@chromium.org</owner>
<summary>
Records media stream request responses for display-video capture
media-device-update requests.
</summary>
</histogram>
<histogram name="Media.MicrophoneMuted" enum="MicrophoneMuteResult"
expires_after="2023-11-12">
<owner>henrika@chromium.org</owner>
<owner>webrtc-audio@google.com</owner>
<summary>
Heuristically detects if the user has muted the microphone or not. Measured
approximately four times per minute while an audio input stream is active.
</summary>
</histogram>
<histogram name="Media.Midi.SendReceiveUsage" enum="MidiSendReceiveUsage"
expires_after="2023-12-01">
<owner>hongchan@chromium.org</owner>
<owner>mjwilson@chromium.org</owner>
<owner>src/third_party/blink/renderer/modules/webaudio/OWNERS</owner>
<summary>
Reports whether any data was sent or received by a MidiManager. Recorded
once per MidiManager instantiation, upon destruction. MidiManager is
instantiated when the first Web MIDI client starts a session, and destroyed
when the last client ends the session.
Warning: this histogram was expired from M86 to M91; data may be missing.
</summary>
</histogram>
<histogram name="Media.Midi.SysExMessageSizeUpTo1MB" units="bytes"
expires_after="2023-12-01">
<owner>hongchan@chromium.org</owner>
<owner>mjwilson@chromium.org</owner>
<owner>src/third_party/blink/renderer/modules/webaudio/OWNERS</owner>
<summary>
Reports sysex message size.
Warning: this histogram was expired from M86 to M91; data may be missing.
</summary>
</histogram>
<histogram name="Media.Midi.Usage" enum="MidiUsage" expires_after="2023-12-01">
<owner>hongchan@chromium.org</owner>
<owner>mjwilson@chromium.org</owner>
<owner>src/third_party/blink/renderer/modules/webaudio/OWNERS</owner>
<summary>
The MidiManager instance use count, but this is not intended to understand
the real API usage because this can be counted by feature scanning scripts
that are often used for footprinting. You may want to track SendReceiveUsage
to monitor only instances that actually send or receive MIDI messages.
Warning: this histogram was expired from M86 to M91; data may be missing.
</summary>
</histogram>
<histogram name="Media.MojoVideoDecoder.ActiveInstances" units="units"
expires_after="2023-11-12">
<owner>sandersd@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records the number of active MojoVideoDecoderService instances that are
alive each time an instance becomes active. An instance is active if
Decode() has been called at least once. This provides an estimate of the
concurrent hardware resource requirements.
</summary>
</histogram>
<histogram name="Media.MojoVideoDecoder.Decode" units="ms"
expires_after="never">
<!-- expires-never: used by ChromeOS test infrastructure -->
<owner>mcasas@chromium.org</owner>
<owner>chromeos-gfx@chromium.org</owner>
<summary>
Delay between a DecodeBuffer (and encoded chunk) input and a decoded
VideoFrame being produced by the remote MojoVideoDecoder. Output once per
successful decode.
</summary>
</histogram>
<histogram name="Media.MojoVideoDecoder.InitialPlaybackErrorCodecCounter"
units="instances" expires_after="2021-10-25">
<owner>eugene@chromium.org</owner>
<owner>liberato@chromium.org</owner>
<summary>
Total number of instances of MojoVideoDecoder used by a page (i.e. render
frame) when an instance of MojoVideoDecoder encountered a decoding error or
a crash during the first 150 frames of a video stream.
</summary>
</histogram>
<histogram name="Media.MojoVideoDecoder.InitialPlaybackSuccessCodecCounter"
units="instances" expires_after="2021-10-25">
<owner>eugene@chromium.org</owner>
<owner>liberato@chromium.org</owner>
<summary>
Total number of instances of MojoVideoDecoder used by a page (i.e. render
frame) when an instance of MojoVideoDecoder successfuly decode the first 150
frames of a video stream.
</summary>
</histogram>
<histogram name="Media.MojoVideoEncodeAccelerator.InputStorageType"
enum="VideoFrameStorageType" expires_after="2023-08-30">
<owner>hiroh@chromium.org</owner>
<owner>mcasas@chromium.org</owner>
<summary>
The storage type of media::VideoFrame passed to MojoVideoEncodeAccelerator
for encoding. The histogram is recorded every frame encode request.
</summary>
</histogram>
<histogram name="Media.MSE.AudioCodec" enum="MSECodec" expires_after="never">
<!-- expires-never: Codec support planning metric. -->
<owner>wolenetz@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Audio codec used in Media Source Extensions playback. Set when MediaSource
addSourceBuffer() is successfully called during playback. Also set twice
during a successful SourceBuffer changeType() operation. See issue 535738
for reworking MSE codec histograms to record on each successfully parsed
initialization segment (possibly filtered to record only when actual new
codec configurations are parsed).
</summary>
</histogram>
<histogram base="true" name="Media.MSE.CodecChangeTime" units="ms"
expires_after="2023-07-02">
<obsolete>
Removed 02/2023 due to lack of further need for this data.
</obsolete>
<owner>wolenetz@chromium.org</owner>
<owner>sandersd@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Duration of config changes that include codec changes, measured from before
decoder flush until after the first output frame is returned. The HW/SW
suffix indicates the type of the decoder that was ultimately selected.
</summary>
</histogram>
<histogram name="Media.MSE.DemuxerDestructionTime" units="ms"
expires_after="2020-10-11">
<owner>wolenetz@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Amount of time taken to destroy one ChunkDemuxer object, not including
initial background task scheduling delay.
</summary>
</histogram>
<histogram name="Media.MSE.DetectedShakaPackagerInMp4" enum="BooleanDetected"
expires_after="2022-06-19">
<obsolete>
Removed 02/2022 due to lack of further need for this data.
</obsolete>
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Tracks if ShakaPackager metadata was detected in the MP4 'moov' atom during
MSE based media playback. Recorded for every 'moov' atom, which is expected
once per asset. Multiple assets may be played within the same MSE session.
</summary>
</histogram>
<histogram name="Media.MSE.ExecutionContext" enum="MediaSourceExecutionContext"
expires_after="2020-10-11">
<owner>wolenetz@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
For each MediaSource instance, records the type of thread that created the
instance.
</summary>
</histogram>
<histogram name="Media.MSE.Mp4ConsecutiveEmptySamples" units="samples"
expires_after="2023-07-02">
<obsolete>
Removed Jan 2023, no further data needed.
</obsolete>
<owner>wolenetz@chromium.org</owner>
<owner>sandersd@chromium.org</owner>
<summary>
Reports the number of consecutive empty samples in a sequence within a track
run. There can be zero or more such sequences in a track run, and each
sequence is reported separately. This metric is expected to inform a
heuristic to realistically bound the parsing complexity of track runs that
may contain empty samples. See https://crbug.com/907268.
</summary>
</histogram>
<histogram name="Media.MSE.Mp4EmptySamplesInTRun" units="samples"
expires_after="2022-04-17">
<obsolete>
Removed Jan 2023, no further data needed.
</obsolete>
<owner>wolenetz@chromium.org</owner>
<owner>sandersd@chromium.org</owner>
<summary>
Reports the number of empty samples within a track run. This metric is
expected to inform a heuristic to realistically bound the parsing complexity
of track runs that may contain empty samples. See https://crbug.com/907268.
</summary>
</histogram>
<histogram name="Media.MSE.Mp4SampleSize" units="bytes"
expires_after="2023-07-02">
<obsolete>
Removed Jan 2023, no further data needed.
</obsolete>
<owner>wolenetz@chromium.org</owner>
<owner>sandersd@chromium.org</owner>
<summary>
Reports the size of each sample parsed. This metric is expected to inform a
heuristic to realistically bound the parsing complexity of track runs that
may contain empty or huge samples. See https://crbug.com/907268.
</summary>
</histogram>
<histogram name="Media.MSE.Mp4TrunSampleCount" units="samples"
expires_after="2023-07-02">
<obsolete>
Removed Jan 2023, no further data needed.
</obsolete>
<owner>wolenetz@chromium.org</owner>
<owner>sandersd@chromium.org</owner>
<summary>
Reports the number of samples in each track run. This metric is expected to
inform a heuristic to realistically bound the parsing complexity of track
runs that may contain huge numbers of samples. See https://crbug.com/907268.
</summary>
</histogram>
<histogram name="Media.MSE.VideoCodec" enum="MSECodec" expires_after="never">
<!-- expires-never: Codec support planning metric. -->
<owner>wolenetz@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Video codec used in Media Source Extensions playback. Set when MediaSource
addSourceBuffer() is successfully called during playback. Also set twice
during a successful SourceBuffer changeType() operation. See issue 535738
for reworking MSE codec histograms to record on each successfully parsed
initialization segment (possibly filtered to record only when actual new
codec configurations are parsed).
</summary>
</histogram>
<histogram name="Media.MSE.VideoCodec.MP4" enum="MSECodec"
expires_after="never">
<!-- expires-never: Codec and container support planning metric. -->
<owner>wolenetz@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Video codec used in Media Source Extensions playback if the media container
is MP4. Set when MediaSource addSourceBuffer() is successfully called during
playback. Also set twice during a successful SourceBuffer changeType()
operation. See issue 535738 for reworking MSE codec histograms to record on
each successfully parsed initialization segment (possibly filtered to record
only when actual new codec configurations are parsed).
</summary>
</histogram>
<histogram name="Media.MSE.VideoCodec.WebM" enum="MSECodec"
expires_after="never">
<!-- expires-never: Codec and container support planning metric. -->
<owner>wolenetz@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Video codec used in Media Source Extensions playback if the media container
is WebM. Set when MediaSource addSourceBuffer() is successfully called
during playback. Also set twice during a successful SourceBuffer
changeType() operation. See issue 535738 for reworking MSE codec histograms
to record on each successfully parsed initialization segment (possibly
filtered to record only when actual new codec configurations are parsed).
</summary>
</histogram>
<histogram name="Media.Notification.ArtworkPresent" enum="Boolean"
expires_after="2021-10-25">
<owner>beccahughes@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether the media notification (including ones for Cast sessions) is
displaying artwork. This is recorded when the artwork is updated by the
underlying media session.
</summary>
</histogram>
<histogram name="Media.Notification.Cast.ArtworkPresent" enum="Boolean"
expires_after="2023-07-09">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether the Cast media notification is displaying artwork. This is recorded
a few seconds after a notification is shown for the first time, which is
different from when Media.Notification.ArtworkPresent is recorded.
</summary>
</histogram>
<histogram name="Media.Notification.Cast.Count" units="count"
expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The number of Cast media notifications that are currently being displayed.
This is recorded when a media notification starts being displayed.
</summary>
</histogram>
<histogram name="Media.Notification.Cast.MetadataPresent"
enum="MediaNotificationMetadata" expires_after="2023-07-09">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether the Cast media notification is displaying certain types of metadata.
This is recorded a few seconds after a notification is shown for the first
time, which is different from when Media.Notification.MetadataPresent is
recorded.
</summary>
</histogram>
<histogram name="Media.Notification.Cast.StartStop"
enum="GlobalMediaControlsCastActionAndEntryPoint"
expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Recorded when the user starts or stops a Cast session. Records the action
and how the Global Media Controls UI was opened.
</summary>
</histogram>
<histogram name="Media.Notification.Cast.UserAction" enum="MediaSessionAction"
expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records the type of the action (e.g. pause) whenever the user makes an
action on a Cast media notification. Starting and stopping casting is
recorded in Media.Notification.Cast.StartStop.
</summary>
</histogram>
<histogram name="Media.Notification.Click" enum="MediaNotificationClickSource"
expires_after="2020-06-07">
<owner>mlamouri@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The type of media notification the user clicked to go back to Chrome.
</summary>
</histogram>
<histogram name="Media.Notification.Count" units="count"
expires_after="2023-11-12">
<owner>beccahughes@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The number of media notifications that are currently being displayed
(including ones for Cast sessions). This is recorded when a media
notification starts being displayed.
</summary>
</histogram>
<histogram name="Media.Notification.MetadataPresent"
enum="MediaNotificationMetadata" expires_after="2021-10-25">
<owner>beccahughes@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether the media notification (including ones for Cast sessions) is
displaying certain types of metadata. This is recorded when the metadata is
updated by the underlying media session.
</summary>
</histogram>
<histogram name="Media.Notification.Source" enum="MediaNotificationSource"
expires_after="2023-09-10">
<owner>beccahughes@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The source of the underlying media session (e.g. ARC, web, Cast) that
displayed the media notification. This is recorded when a notification is
available to be shown.
</summary>
</histogram>
<histogram name="Media.Notification.UserAction" enum="MediaSessionAction"
expires_after="2023-11-12">
<owner>beccahughes@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The action (e.g. pause) that a user clicked on a media notification
(including ones for Cast sessions).
</summary>
</histogram>
<histogram name="Media.OutputStreamDuration" units="ms"
expires_after="2023-11-12">
<owner>guidou@chromium.org</owner>
<owner>olka@chromium.org</owner>
<owner>webrtc-audio-uma@google.com</owner>
<summary>
Duration of an audio output stream. Measured in AudioOutputController from
when a stream is started until it is stopped. A stream is stopped when it is
paused, closed (i.e. destructed), or when a device change event causes it to
be restarted.
</summary>
</histogram>
<histogram name="Media.PeakWebMediaPlayerCount" units="players"
expires_after="M100">
<obsolete>
Removed 04/2022 due to lack of further need for this data.
</obsolete>
<owner>dalecurtis@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records the peak number of WebMediaPlayer objects per RenderFrame upon
RenderFrame destruction (both cleanly and via render process termination).
</summary>
</histogram>
<histogram name="Media.PepperVideoDecoder.HardwareAccelerationBehavior"
enum="PepperVideoDecoderHardwareAccelerationBehavior" expires_after="never">
<!-- expires-never: used by ChromeOS test infrastructure -->
<owner>pmolinalopez@chromium.org</owner>
<owner>chromeos-gfx-video@google.com</owner>
<summary>
The hardware/software decoding behavior used for a PPB_VideoDecoder API
instance. This UMA is recorded when the PepperVideoDecoderHost is destroyed.
</summary>
</histogram>
<histogram base="true" name="Media.PepperVideoDecoderOutputPictureCount"
enum="MediaVideoHeight" expires_after="2020-12-31">
<owner>sandersd@chromium.org</owner>
<owner>dalecurtis@chromium.org</owner>
<summary>
Counts every output picture emitted to a PPAPI client, categorized by size
and decoder type. Flash will only use platform decoders, but NaCl clients
can use either decoder type.
</summary>
</histogram>
<histogram name="Media.PipelineStatus.AudioVideo.{VideoCodec}.{Pipeline}"
enum="PipelineStatus" expires_after="never">
<!-- expires-never: Media pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Status of the media pipeline at the end of its lifecycle for audio-video
streams with {VideoCodec} video codec using {Pipeline}.
</summary>
<token key="VideoCodec" variants="VideoCodec"/>
<token key="Pipeline">
<variant name="DDS.HW"
summary="RendererImpl with hardware decoder and
DecryptingDemuxerStream"/>
<variant name="DDS.SW"
summary="RendererImpl with software decoder and
DecryptingDemuxerStream"/>
<variant name="DVD" summary="RendererImpl with DecryptingVideoDecoder"/>
<variant name="HW" summary="RendererImpl with hardware decoder"/>
<variant name="MediaFoundationRenderer"/>
<variant name="SW" summary="RendererImpl with software decoder"/>
<variant name="UnknownRenderer" summary="an unknown Renderer"/>
</token>
</histogram>
<histogram name="Media.PipelineStatus.Start" enum="PipelineStatus"
expires_after="2023-10-09">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Status of the media pipeline starting process (including demuxer and
renderer initialization). If the media pipeline is destroyed during the
starting process nothing will be reported, but this should relatively rare.
</summary>
</histogram>
<histogram name="Media.PipelineStatus.{StreamType}" enum="PipelineStatus"
expires_after="never">
<!-- expires-never: Media pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Status of the media pipeline at the end of its lifecycle for {StreamType}
streams.
</summary>
<token key="StreamType">
<variant name="AudioOnly" summary="audio-only"/>
<variant name="Unsupported" summary="unsupported"/>
<variant name="VideoOnly" summary="video-only"/>
</token>
</histogram>
<histogram name="Media.PlatformVideoDecoding.ChromaSampling"
enum="VideoChromaSampling" expires_after="2023-02-08">
<owner>tmathmeyer@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Video chroma sub-sampling format requested for decoding through platform
decoders. This collection happens regardless of whether the platform decoder
supports non-420 video format decoding or not.
</summary>
</histogram>
<histogram name="Media.PlatformVideoDecoding.Decode" units="ms"
expires_after="never">
<!-- expires-never: used by ChromeOS test infrastructure -->
<owner>mcasas@chromium.org</owner>
<owner>chromeos-gfx@chromium.org</owner>
<summary>
Time for the platform-specific (set of) video decode acceleration command(s)
to be executed. Output once per decode request submit.
</summary>
</histogram>
<histogram name="Media.PlaybackPower.BatteryDelta"
enum="MediaPlaybackPowerTypes" expires_after="2020-07-31">
<owner>liberato@chromium.org</owner>
<owner>videostack-eng@chromium.org</owner>
<summary>
Total battery (0-100 percent) consumed by playback. When divided by
Media.PlaybackPower.ElapsedTime, this provides the average rate of battery
drain for that category of playback. Units are (total) percent. This is
recorded when an entire percent (or more) is consumed during playback. Since
devices have different battery sizes, methods of measuring battery, and
different power consumption rates, it's a good idea to filter by a specific
device type and OS version before trying to interpret these results. The
magnitude of these numbers, alone, is also likely hard to use, for this
reason. Instead, consider comparing A/B experiments to see if they get
larger or smaller. Playbacks under one msec are ignored.
</summary>
</histogram>
<histogram name="Media.PlaybackPower.ElapsedTime"
enum="MediaPlaybackPowerTypes" expires_after="2020-07-31">
<owner>liberato@chromium.org</owner>
<owner>videostack-eng@chromium.org</owner>
<summary>
Total time, in msec, elapsed while consuming the battery described by
Media.PlaybackPower.BatteryDelta. See that histogram for details. Recorded
when one or more percent of battery is consumed during playback.
</summary>
</histogram>
<histogram name="Media.ProgressEventTimerState"
enum="HTMLMediaElement_ProgressEventTimerState" expires_after="2021-08-01">
<owner>fdoray@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records the state of an HTMLMediaElement when its &quot;progress event&quot;
timer fires. Used to determine how often the timer causes unnecessary wake
ups, to prioritize crbug.com/1143317 and measure the impact of eventual
fixes.
</summary>
</histogram>
<histogram name="Media.RebuffersCount" units="rebuffers" expires_after="never">
<!-- expires-never: Media pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Indicates the number of rebuffers a given watch time session had.
</summary>
</histogram>
<histogram name="Media.RegionCapture.CropTo.Latency" units="ms"
expires_after="2024-01-15">
<owner>eladalon@chromium.org</owner>
<owner>jophba@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<summary>
Duration in milliseconds of the time it takes for a
BrowserCaptureMediaStreamTrack.cropTo() call to resolve(either successfully
or with an error). Note a call which never resolves won't be counted in this
metric.
</summary>
</histogram>
<histogram name="Media.RegionCapture.CropTo.Result" enum="CropToResult"
expires_after="2024-01-15">
<owner>eladalon@chromium.org</owner>
<owner>jophba@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<summary>
Tracks the result of calls to BrowserCaptureMediaStreamTrack.cropTo().
</summary>
</histogram>
<histogram name="Media.RegionCapture.ProduceCropTarget.Function.Result"
enum="ProduceCropTargetFunctionResult" expires_after="2024-01-15">
<owner>eladalon@chromium.org</owner>
<owner>jophba@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<summary>
Tracks the result of calls to MediaDevices.produceCropTarget().
Specifically, this histogram tracks whether a new Promise was produced, and
if not, why not. Another histogram tracks the result of new Promises, i.e.
whether they were resolved or rejected.
</summary>
</histogram>
<histogram name="Media.RegionCapture.ProduceCropTarget.Promise.Result"
enum="ProduceCropTargetPromiseResult" expires_after="2024-01-15">
<owner>eladalon@chromium.org</owner>
<owner>jophba@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<summary>
When ProduceCropTarget() is called for the first time on a given
HTMLElement, a new Promise is produced. This histogram tracks the result of
this Promise - whether it was resolved or rejected.
</summary>
</histogram>
<histogram name="Media.Remoting.AudioBitrate" units="kbps"
expires_after="2023-11-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Measured audio content transfer bitrate while remoting content.
</summary>
</histogram>
<histogram name="Media.Remoting.AudioChannelLayout" enum="ChannelLayout"
expires_after="2023-09-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Audio channel layout used while remoting content.</summary>
</histogram>
<histogram name="Media.Remoting.AudioCodec" enum="AudioCodec"
expires_after="2023-11-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Audio codec used while remoting content.</summary>
</histogram>
<histogram name="Media.Remoting.AudioSamplesPerSecond" enum="AudioSampleRate"
expires_after="2023-09-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Audio sampling rate while remoting audio content.</summary>
</histogram>
<histogram name="Media.Remoting.AudioSamplesPerSecondUnexpected" units="Hz"
expires_after="2023-09-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Audio sampling rate while remoting audio content (atypical values, in Hz).
</summary>
</histogram>
<histogram name="Media.Remoting.Compatibility" enum="RemotingCompatibility"
expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Whether the given media is compatible with media remoting. Recorded whenever
the conditions are met to start remoting (e.g. the media element is the
dominant page content and is not paused).
</summary>
</histogram>
<histogram name="Media.Remoting.RemotePlaybackEnabledByPage"
enum="BooleanEnabled" expires_after="2023-11-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Tracks whether a web page allows content to be remoted. Recorded when the
media player finishes loading and when the site changes this attribute
afterwards.
</summary>
</histogram>
<histogram name="Media.Remoting.SessionDuration" units="ms"
expires_after="2023-11-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Measures the duration of each remoting session.</summary>
</histogram>
<histogram name="Media.Remoting.SessionStartFailedReason"
enum="RemotingStartFailReason" expires_after="2023-12-01">
<owner>muyaoxu@google.com</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Tracks the reason that a session failed to start.</summary>
</histogram>
<histogram name="Media.Remoting.SessionStartTrigger"
enum="RemotingStartTrigger" expires_after="2023-11-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Tracks the trigger for starting a remoting session.</summary>
</histogram>
<histogram name="Media.Remoting.SessionStopTrigger" enum="RemotingStopTrigger"
expires_after="2023-11-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Tracks the trigger for stopping a remoting session.</summary>
</histogram>
<histogram name="Media.Remoting.ShortSessionDuration" units="ms"
expires_after="2023-11-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Measures the duration of each remoting session shorter than 15 seconds.
</summary>
</histogram>
<histogram name="Media.Remoting.TimeUntilFirstPlayout" units="ms"
expires_after="2023-11-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Measures how long, from the start of a remoting session, until content began
playing out on the remote device.
</summary>
</histogram>
<histogram name="Media.Remoting.TimeUntilRemoteInitialized" units="ms"
expires_after="2023-11-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Measures how long, from the start of a remoting session, until a message was
received from the remote device indicating initialization succeeded.
</summary>
</histogram>
<histogram name="Media.Remoting.TrackConfiguration"
enum="RemotingTrackConfiguration" expires_after="2023-09-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Tracks whether audio or video or both are remoted.</summary>
</histogram>
<histogram name="Media.Remoting.VideoAspectRatio" units="%"
expires_after="2023-09-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Aspect ratio of video while remoting content.</summary>
</histogram>
<histogram name="Media.Remoting.VideoBitrate" units="kbps"
expires_after="2023-11-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Measured video content transfer bitrate while remoting content.
</summary>
</histogram>
<histogram name="Media.Remoting.VideoCodec" enum="VideoCodec"
expires_after="2023-09-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Video codec used while remoting content.</summary>
</histogram>
<histogram name="Media.Remoting.VideoCodecProfile" enum="VideoCodecProfile"
expires_after="2023-11-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Video codec profile used while remoting content.</summary>
</histogram>
<histogram name="Media.Remoting.VideoNaturalWidth" units="pixels"
expires_after="2023-09-12">
<owner>jophba@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Video width while remoting content.</summary>
</histogram>
<histogram name="Media.Remoting.VideoPixelRateSupport"
enum="RemotingVideoPixelRateSupport" expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Pixels-per-second in a video and whether the receiver supports its playback.
Recorded whenever we are about to start media remoting a video.
</summary>
</histogram>
<histogram name="Media.RtcLowLatencyVideoRenderer.AverageQueueLengthX10"
units="frames" expires_after="2023-10-22">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
10 times the average queue length when Render() is called in the RTC
low-latency video renderer. Repeatedly measured with a period of 100 s for
as long as the stream is active.
</summary>
</histogram>
<histogram name="Media.RtcLowLatencyVideoRenderer.DrainedFramesPermille"
units="permille" expires_after="2023-10-22">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Per mille of frames drained in the RTC low-latency video renderer.
Repeatedly measured with a period of 100 s for as long as the stream is
active.
</summary>
</histogram>
<histogram name="Media.RtcLowLatencyVideoRenderer.DroppedFramesPermille"
units="permille" expires_after="2023-10-22">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Per mille of frames dropped in the RTC low-latency video renderer.
Repeatedly measured with a period of 100 s for as long as the stream is
active.
</summary>
</histogram>
<histogram name="Media.RtcLowLatencyVideoRenderer.EnterDrainModeCount"
units="count" expires_after="2023-10-22">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Number of times drain mode is entered. Repeatedly measured with a period of
100 s for as long as the stream is active.
</summary>
</histogram>
<histogram name="Media.RtcLowLatencyVideoRenderer.MaxQueueLength"
units="frames" expires_after="2023-05-27">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
The maximum queue length that is observed when Render() is called in the RTC
low-latency video renderer. Repeatedly measured with a period of 100 s for
as long as the stream is active.
</summary>
</histogram>
<histogram name="Media.RtcLowLatencyVideoRenderer.MaxSizeDropQueueCount"
units="count" expires_after="2023-10-01">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Number of times the maximum queue size is exceeded and the entire queue is
dropped. Repeatedly measured with a period of 100 s for as long as the
stream is active.
</summary>
</histogram>
<histogram name="Media.RtcLowLatencyVideoRenderer.NoNewFrameToRenderPermille"
units="permille" expires_after="2023-10-22">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Per mille of render times where the queue is empty and there is no new frame
to render. Repeatedly measured with a period of 100 s for as long as the
stream is active.
</summary>
</histogram>
<histogram name="Media.RtcLowLatencyVideoRenderer.ReduceSteadyStateCount"
units="count" expires_after="2023-10-22">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Number of times the reduce steady state queue feature is activated.
Repeatedly measured with a period of 100 s for as long as the stream is
active.
</summary>
</histogram>
<histogram name="Media.RtcLowLatencyVideoRenderer.TotalFrames" units="frames"
expires_after="2023-10-22">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Total number of frames enqueued to the RTC low-latency video renderer.
Repeatedly measured with a period of 100 s for as long as the stream is
active.
</summary>
</histogram>
<histogram name="Media.RtcLowLatencyVideoRenderer.TryToRenderFrameCount"
units="count" expires_after="2023-10-22">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Number of times we try to render a new frame. Repeatedly measured with a
period of 100 s for as long as the stream is active.
</summary>
</histogram>
<histogram name="Media.RTCVideoDecoderError" enum="MediaStatusCode"
expires_after="2024-04-20">
<owner>posciak@chromium.org</owner>
<owner>liberato@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Counts of video decode errors reported to RTCVideoDecoder, recorded when an
error is reportd to RTCVideoDecoder. Also used for DecoderStream. Expired in
M83 and re-added in M92. Warning: this histogram was expired between
2023-04-16 to 2023-04-20; data may be missing.
</summary>
</histogram>
<histogram name="Media.RTCVideoDecoderFallbackReason.{Codecs}"
enum="RTCVideoDecoderFallbackReason" expires_after="2023-10-10">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
The reason for fallback to software decoding for the codec {Codecs}.
Reported when a fallback to software decoding occurs.
</summary>
<token key="Codecs">
<variant name="H264" summary=""/>
<variant name="Other" summary=""/>
<variant name="Vp8" summary=""/>
<variant name="Vp9" summary=""/>
</token>
</histogram>
<histogram name="Media.RTCVideoDecoderFirstFrameLatencyMs" units="ms"
expires_after="2022-06-05">
<owner>liberato@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Time from decoder creation until the first frame is decoded.
</summary>
</histogram>
<histogram name="Media.RTCVideoDecoderInitDecodeSuccess" enum="BooleanSuccess"
expires_after="never">
<!-- expires-never: WebRTC health metric. -->
<owner>mcasas@chromium.org</owner>
<owner>sprang@chromium.org</owner>
<owner>chromeos-gfx@chromium.org</owner>
<summary>
Indicates whether we were successful in initializing hardware video decoder
for use in the RTC pipeline.
</summary>
</histogram>
<histogram name="Media.RTCVideoDecoderInitializationLatencyMs" units="ms"
expires_after="2023-10-10">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Initialization latency of the hardware video decoder that is used in the RTC
pipeline.
</summary>
</histogram>
<histogram name="Media.RTCVideoDecoderMaxInFlightDecodes" units="frames"
expires_after="2024-04-20">
<owner>liberato@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Max number of frames sent for video decode via the DecoderStream adapter,
that have not also returned a decoded video frame. The metric is emitted
once per RTCVideoDecoderStreamAdapter instance, as the max observed value
over that instance's lifetime. Warning: this histogram was expired between
2022-08-14 to 2023-04-20; data may be missing.
</summary>
</histogram>
<histogram name="Media.RTCVideoDecoderProfile" enum="VideoCodecProfile"
expires_after="never">
<!-- expires-never: Codec and container support planning metric. -->
<owner>mcasas@chromium.org</owner>
<owner>sprang@chromium.org</owner>
<owner>chromeos-gfx@chromium.org</owner>
<summary>Video codec profile used in RTC video decoder.</summary>
</histogram>
<histogram name="Media.RTCVideoDecoderReinitializationLatencyMs" units="ms"
expires_after="2023-10-10">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Reinitialization latency of the hardware video decoder that is used in the
RTC pipeline.
</summary>
</histogram>
<histogram name="Media.RTCVideoDecoderStream.Error.OnFrameReady"
enum="MediaStatusCode" expires_after="2021-08-15">
<owner>liberato@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
This records the media::StatusCode from the RTCVideoDecoderStreamAdapter. It
is emitted when the adapter encounters an error during decoding.
</summary>
</histogram>
<histogram name="Media.RTCVideoEncoderInitEncodeSuccess" enum="BooleanSuccess"
expires_after="never">
<!-- expires-never: WebRTC health metric. -->
<owner>mcasas@chromium.org</owner>
<owner>sprang@chromium.org</owner>
<owner>chromeos-gfx@chromium.org</owner>
<summary>
Indicates whether we were successful in initializing hardware video encoder
for use in the RTC pipeline.
</summary>
</histogram>
<histogram name="Media.RTCVideoEncoderProfile" enum="VideoCodecProfile"
expires_after="never">
<!-- expires-never: Codec and container support planning metric. -->
<owner>mcasas@chromium.org</owner>
<owner>sprang@chromium.org</owner>
<owner>chromeos-gfx@chromium.org</owner>
<summary>Video codec profile used in RTC video encoder.</summary>
</histogram>
<histogram name="Media.RTCVideoEncoderStatus.{Codecs}" enum="EncoderStatus"
expires_after="never">
<!-- expires-never: Codec and container support planning metric. -->
<owner>hiroh@chromium.org</owner>
<owner>mcasas@chromium.org</owner>
<owner>sprang@chromium.org</owner>
<owner>chromeos-gfx@chromium.org</owner>
<summary>
Records if the {Codecs} encoder was torn down because the stream ended, or
if it was due to an encoder error. Recorded once when shutting down an
accelerated (or out of process) video encoder.
</summary>
<token key="Codecs">
<variant name="AV1" summary=""/>
<variant name="H264" summary=""/>
<variant name="Other" summary=""/>
<variant name="VP8" summary=""/>
<variant name="VP9" summary=""/>
</token>
</histogram>
<histogram name="Media.RTCVideoEncoderTimestampMatchSuccess"
enum="BooleanSuccess" expires_after="M77">
<owner>emircan@chromium.org</owner>
<summary>
Indicates whether we were successful in preserving timestamps in hardware
video encoder session. It is tracked during the session and logged after it
ends.
</summary>
</histogram>
<histogram name="Media.Session.ActiveTime" units="ms"
expires_after="2023-01-22">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Time during which a media session has been active, in other words, the time
between an activation and deactivation, without counting time while it was
suspended. If a session is activated after being deactivated, there will be
two entries. For example, if a user plays a song but is interrupted by a
phone call, it will only account for the song playing time.
</summary>
</histogram>
<histogram name="Media.Session.Pause" enum="MediaSessionActionSource"
expires_after="2021-12-05">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The number of times the user paused playback of a media session using other
means than the pause button on the page.
</summary>
</histogram>
<histogram name="Media.Session.Play" enum="MediaSessionActionSource"
expires_after="2023-10-22">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The number of times the user started playback of a media session using other
means than the play button on the page.
</summary>
</histogram>
<histogram name="Media.Session.Stop" enum="MediaSessionActionSource"
expires_after="2022-02-06">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The number of times the user stopped a media session using other means than
the pause button on the page.
</summary>
</histogram>
<histogram name="Media.Session.Suspended" enum="MediaSessionSuspendedSource"
expires_after="2022-02-06">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The number of times a media session is suspended and why it has been
suspended.
</summary>
</histogram>
<histogram name="Media.SRC.VideoCodec.MP4" enum="VideoCodec"
expires_after="never">
<!-- expires-never: Codec and container support planning metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Video codec used in plain src= (not MSE) HTML5 media if the media container
is MP4.
</summary>
</histogram>
<histogram name="Media.SRC.VideoCodec.WebM" enum="VideoCodec"
expires_after="never">
<!-- expires-never: Codec and container support planning metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Video codec used in plain src= (not MSE) HTML5 media if the media container
is WebM.
</summary>
</histogram>
<histogram base="true" name="Media.TimeToFirstFrame" units="ms"
expires_after="never">
<!-- expires-never: Media pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Time in milliseconds from when WebMediaPlayerImpl starts loading until the
first video frame has been shown.
</summary>
</histogram>
<histogram base="true" name="Media.TimeToMetadata" units="ms"
expires_after="never">
<!-- expires-never: Media pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Time in milliseconds from when WebMediaPlayerImpl starts loading until
metadata is known.
</summary>
</histogram>
<histogram base="true" name="Media.TimeToPlayReady" units="ms"
expires_after="never">
<!-- expires-never: Media pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Time in milliseconds from when WebMediaPlayer starts loading until it has
buffered enough to start playback.
</summary>
</histogram>
<histogram name="Media.TotalMBytes" units="MB" expires_after="M85">
<owner>hajimehoshi@chromium.org</owner>
<owner>kouhei@chromium.org</owner>
<owner>scherkus@chromium.org</owner>
<summary>Size of HTML5 media (when known), in MB.</summary>
</histogram>
<histogram name="Media.Ui.GetDisplayMedia.BasicFlow.UserInteraction"
enum="MediaUiGetDisplayMediaBasicFlowUserInteraction"
expires_after="2023-11-12">
<owner>eladalon@chromium.org</owner>
<owner>fbeaufort@chromium.org</owner>
<summary>
Records the result of the user's interaction with the media picker dialog
which is displayed following a call to getDisplayMedia that results in the
basic flow (preferCurrentTab either unspecified or is false).
</summary>
</histogram>
<histogram name="Media.Ui.GetDisplayMedia.DisplayCapturePolicyResult"
enum="DisplayCapturePolicyResult" expires_after="2023-11-12">
<owner>eladalon@chromium.org</owner>
<owner>guidou@chromium.org</owner>
<summary>
Records whether the display-capture permission policy allows/disallows this
call to getDisplayMedia.
</summary>
</histogram>
<histogram name="Media.Ui.GetDisplayMedia.PreferCurrentTabFlow.UserInteraction"
enum="MediaUiGetDisplayMediaPreferCurrentTabFlowUserInteraction"
expires_after="2023-11-12">
<owner>eladalon@chromium.org</owner>
<owner>fbeaufort@chromium.org</owner>
<summary>
Records the result of the user's interaction with the media picker dialog
which is displayed following a call to getDisplayMedia where
preferCurrentTab was specified.
</summary>
</histogram>
<histogram name="Media.Ui.GetDisplayMedia.{Flow}.DialogDuration" units="ms"
expires_after="2024-05-29">
<owner>tovep@chromium.org</owner>
<owner>eladalon@chromium.org</owner>
<summary>
The time-duration the DesktopMediaPickerDialog is opened when
getDisplayMedia is called with the preferCurrentTab constraint either set to
true (PreferCurrentTabFlow) or unspecified/false (BasicFlow). The duration
is recorded each time the dialog is closed.
</summary>
<token key="Flow">
<variant name="BasicFlow"/>
<variant name="PreferCurrentTabFlow"/>
</token>
</histogram>
<histogram base="true" name="Media.UnderflowDuration2" units="ms"
expires_after="never">
<!-- expires-never: Media pipeline health metric. -->
<!-- Name completed by histogram_suffixes name="WebMediaPlayerImplTypes" -->
<owner>dalecurtis@chromium.org</owner>
<summary>
The amount of time taken to leave the underflow state (i.e. resume playback)
for playbacks. This doesn't report initial zero samples, which was
previously used to compensate for playbacks that don't rebuffer.
</summary>
</histogram>
<histogram name="Media.URLScheme2" enum="URLSchemeForHistogram"
expires_after="never">
<!-- expires-never: Codec support planning metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
URL scheme used with HTML5 media; only recorded for src=URL playbacks and
not for Media Source Extensions playbacks. Each URL provides one sample.
</summary>
</histogram>
<histogram name="Media.VaapiLinux.SupportedVideoDecoder"
enum="VideoDecoderType" expires_after="2022-02-28">
<owner>tmathmeyer@chromium.org</owner>
<owner>videostack-eng@google.com</owner>
<summary>
Records the usage of VaapiVideoDecoder VaapiVideoDecodeAccelerator based on
vulkan support and Vaapi driver version on linux. This is recorded on GPU
process startup when hardware accelerated video decoding support is checked.
</summary>
</histogram>
<histogram name="Media.VaapiVideoDecoder.DecodeError" enum="BooleanError"
expires_after="2023-10-22">
<owner>mcasas@chromium.org</owner>
<owner>chromeos-gfx@chromium.org</owner>
<summary>
The codec-specific delegate in VaapiVideoDecoder has returned an error from
Decode(). This could be a parse error, or a VA error itself.
</summary>
</histogram>
<histogram name="Media.VaapiVideoDecoder.VaapiWrapperCreationSuccess"
enum="BooleanSuccess" expires_after="2023-10-08">
<owner>mcasas@chromium.org</owner>
<owner>chromeos-gfx-video@google.com</owner>
<summary>
Whether the creation of VaapiWrapper succeeded or not inside
VaapiVideoDecoder.
</summary>
</histogram>
<histogram name="Media.VaapiWrapper.VADisplayStateInitializeSuccess"
enum="BooleanSuccess" expires_after="2024-04-20">
<owner>mcasas@chromium.org</owner>
<owner>chromeos-gfx-video@google.com</owner>
<summary>
Whether the call to VaapiWrapper's VADisplayState::Initialize() succeeded or
not. Warning: this histogram was expired between 2023-02-12 to 2023-04-20;
data may be missing.
</summary>
</histogram>
<histogram name="Media.VAJDA.ResponseToClient"
enum="MjpegDecodeAcceleratorErrorCode" expires_after="2022-01-07">
<owner>andrescj@chromium.org</owner>
<owner>chromeos-gfx@chromium.org</owner>
<summary>
The response given to the client by VaapiJpegDecodeAccelerator for a decode
request. This is recorded when the decode succeeds or fails. The recorded
value corresponds to a MjpegDecodeAccelerator::Error.
</summary>
</histogram>
<histogram name="Media.VAJEA.EncoderResult" enum="VAJEAEncoderResult"
expires_after="M95">
<owner>wtlee@chromium.org</owner>
<owner>chromeos-gfx@chromium.org</owner>
<summary>
Result codes reported by jpeg encode using VA-API hardware jpeg encoder.
</summary>
</histogram>
<histogram name="Media.VAVDA.VaapiWrapperCreationSuccess" enum="BooleanSuccess"
expires_after="2023-02-12">
<owner>mcasas@chromium.org</owner>
<owner>chromeos-gfx-video@google.com</owner>
<summary>
Whether the creation of VaapiWrapper succeeded or not inside VaVDA.
</summary>
</histogram>
<histogram name="Media.Video.Autoplay" enum="AutoplaySource"
expires_after="2023-11-12">
<owner>dalecurtis@chromium.org</owner>
<owner>evliu@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records the autoplay source of videos. This includes
Media.Video.Autoplay.Muted.
</summary>
</histogram>
<histogram name="Media.Video.Autoplay.Muted.PlayMethod.BecomesVisible"
enum="Boolean" expires_after="2024-01-30">
<owner>dalecurtis@chromium.org</owner>
<owner>evliu@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records muted video started playing with play() become visible at some
point. The UMA for false is not complete since it is recorded in a
destructor which is garbage-collected. Please subtract
Media.Video.Autoplay.Muted &quot;play() method&quot; count with the true
count of this histogram to obtain the real false count.
</summary>
</histogram>
<histogram name="Media.Video.Autoplay.Muted.PlayMethod.OffscreenDuration"
units="ms" expires_after="2024-01-30">
<owner>dalecurtis@chromium.org</owner>
<owner>evliu@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records the offscreen playing duration of a muted video autoplaying from
play() method.
</summary>
</histogram>
<histogram name="Media.Video.Autoplay.Muted.UnmuteAction" enum="BooleanSuccess"
expires_after="2023-09-03">
<owner>dalecurtis@chromium.org</owner>
<owner>evliu@google.com</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Status of the unmute action on a video that autoplayed because it was muted.
</summary>
</histogram>
<histogram
name="Media.Video.Capture.Mac.CameraSystemPermission.FixedTime.SinceFirstFailure"
units="ms" expires_after="2023-07-01">
<owner>toprice@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<summary>
The time from the first camera access failure due to blocked system
permission before the last browser restart to startup after browser restart.
Logged once at browser startup if the system permission then is allowed.
Warning: this histogram was expired from 2020-03-01 to 2022-03-09; data may
be missing.
</summary>
</histogram>
<histogram
name="Media.Video.Capture.Mac.CameraSystemPermission.FixedTime.SinceLastFailure"
units="ms" expires_after="2023-07-01">
<owner>toprice@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<summary>
The time from the last camera access failure due to blocked system
permission before the last browser restart to startup after browser restart.
Logged once at browser startup if the system permission then is allowed.
Warning: this histogram was expired from 2020-03-01 to 2022-03-09; data may
be missing.
</summary>
</histogram>
<histogram name="Media.Video.Capture.Mac.CameraSystemPermission.Startup"
enum="SystemMediaCapturePermission" expires_after="2023-09-24">
<owner>toprice@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<summary>
The Mac system permission state for camera. Logged once at browser startup.
For more information on the values, see
https://developer.apple.com/documentation/avfoundation/avauthorizationstatus.
Warning: this histogram was expired from 2020-03-01 to 2022-03-09; data may
be missing.
</summary>
</histogram>
<histogram
name="Media.Video.Capture.Mac.CameraSystemPermission.StartupAfterFailure"
enum="SystemMediaCapturePermission" expires_after="2023-07-01">
<owner>toprice@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<summary>
The Mac system permission state for camera. Logged once at browser startup
if there was a failure accessing the camera due to blocked system permission
before the last browser restart. For more information on the values, see
https://developer.apple.com/documentation/avfoundation/avauthorizationstatus.
Warning: this histogram was expired from 2020-03-01 to 2022-03-09; data may
be missing.
</summary>
</histogram>
<histogram name="Media.Video.Capture.Mac.CameraSystemPermission.UserMedia"
enum="SystemMediaCapturePermission" expires_after="2023-11-12">
<owner>toprice@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<summary>
The Mac system permission state for camera at the time of a user media
request. Logged when the system permission is checked. If the permission is
&quot;not determined&quot; this is logged, permission is requested, and the
resulting permission (from the user response) is also logged. For more
information on the values, see
https://developer.apple.com/documentation/avfoundation/avauthorizationstatus.
Warning: this histogram was expired from 2020-03-01 to 2022-03-09; data may
be missing.
</summary>
</histogram>
<histogram name="Media.Video.Capture.Mac.ScreenCaptureSystemPermission"
enum="BooleanAllowed" expires_after="2023-10-08">
<owner>bur@chromium.org</owner>
<owner>mark@chromium.org</owner>
<summary>
The Mac system permission state for screen capture. Logged once at browser
startup and when attempting to screen capture. Requires macOS 10.15+.
Samples will not be collected on earlier macOS versions.
</summary>
</histogram>
<histogram name="Media.Video.Roughness" units="ms" expires_after="2023-11-12">
<owner>eugene@chromium.org</owner>
<owner>videostack-eng@chromium.org</owner>
<summary>
Video playback roughness for a 100s interval. Suffixed by the framerate.
</summary>
</histogram>
<histogram name="Media.VideoCapture.AspectRatio" units="%" expires_after="M120">
<owner>mcasas@chromium.org</owner>
<owner>jophba@chromium.org</owner>
<summary>
Video Capture Device captured aspect ratio, as a rounded integer multiplied
by 100. The collection is made in the VideoCaptureController upon reception
of the first frame.
</summary>
</histogram>
<histogram name="Media.VideoCapture.BlacklistedDevice"
enum="BlacklistedVideoCaptureDeviceNames" expires_after="M82">
<owner>mcasas@chromium.org</owner>
<summary>
Counts appearances of Blacklisted Video Capture devices during enumeration.
This collection happens during first enumeration in the appropriate
platforms' VideoCaptureDeviceFactory.
</summary>
</histogram>
<histogram name="Media.VideoCapture.DelayUntilFirstFrame" units="ms"
expires_after="2023-11-05">
<owner>armax@chromium.org</owner>
<owner>video-cmi-mpp@google.com</owner>
<summary>
Time it takes from the moment that a VideoCaptureController is requested to
start to the moment the first video frame arrives at
VideoCaptureController::OnFrameReadyInBuffer().
</summary>
</histogram>
<histogram name="Media.VideoCapture.Device.Opened.ByModelId" units="usb_id"
expires_after="2024-05-23">
<owner>atadres@chromium.org</owner>
<summary>
This metric records an unsigned interger value that corresponds to the USB
ID (vendor + device ID) of the webcam that is currently in use by the user.
The USB ID is originally a 32-bit hexadecimal number (formatted as
XXXX:XXXX) that then is converted to an unsigned integer for metrics
purposes. In case of a unknown/invalid USB ID, 0 is logged. This is done
when the CreateDevice method is called on the corresponding
VideoCaptureDeviceFactory class based on the operating system. For example,
on MacOS, this happens when VideoCaptureDeviceFactoryMac::CreateDevice is
called.
</summary>
</histogram>
<histogram name="Media.VideoCapture.Device.SupportedPixelFormat"
enum="VideoPixelFormatUnion" expires_after="2023-03-19">
<owner>eshr@google.com</owner>
<owner>handellm@google.com</owner>
<summary>
Counts each pixel format an enumerated video capture device supports. This
is recorded during the first device enumeration per Capture process launch.
(This is usually once per launch of Chrome unless the Capture process
crashes.)
</summary>
</histogram>
<histogram name="Media.VideoCapture.Device.SupportedResolution"
enum="VideoResolutionDesignation" expires_after="M120">
<owner>eshr@google.com</owner>
<owner>handellm@google.com</owner>
<owner>jophba@chromium.org</owner>
<summary>
Counts each resolution supported by an enumerated video capture device.
These are categorized by designation (eg. QVGA, HD, 4KUHD, etc) instead of
pixel count. This is recorded during the first device enumeration per
Capture process launch. (This is usually once per launch of Chrome unless
the Capture process crashes.)
</summary>
</histogram>
<histogram name="Media.VideoCapture.Error" enum="VideoCaptureError"
expires_after="2023-11-05">
<owner>mcasas@chromium.org</owner>
<owner>guidou@chromium.org</owner>
<owner>armax@chromium.org</owner>
<summary>
Breaks down the events counted in Media.VideoCaptureManager.Event bucket
&quot;Stopping video capture due to error&quot; by the origin of the error.
This allows narrowing down what is causing errors. An event for this
histogram is emitted once for each time a client disconnects from a video
capture session because the session has reported an error.
</summary>
</histogram>
<histogram name="Media.VideoCapture.FrameDrop"
enum="VideoCaptureFrameDropReason" expires_after="M120">
<owner>mcasas@chromium.org</owner>
<owner>guidou@chromium.org</owner>
<owner>armax@chromium.org</owner>
<owner>jophba@chromium.org</owner>
<summary>
An event for this histogram is emitted once for each time a video frame is
dropped on the way from a capture source, e.g. a webcam, to a corresponding
media::VideoCaptureController instance running in the Browser process. If
more than
|VideoCaptureController::max_consecutive_frame_drop_for_same_reason_count()|
frames are dropped consecutively for the same reason, no more events for the
same reason will be counted for that session until either a frame is
delivered successfully or the reason for the frame dropping changes.
</summary>
</histogram>
<histogram name="Media.VideoCapture.FrameRate" units="fps" expires_after="M120">
<owner>mcasas@chromium.org</owner>
<owner>guidou@chromium.org</owner>
<owner>armax@chromium.org</owner>
<owner>handellm@chromium.org</owner>
<owner>jophba@chromium.org</owner>
<summary>
Video Capture Device frame rate requested by VideoCaptureManager on
AllocateAndStart(). The collection is made in the VideoCaptureController
upon reception of the first frame.
</summary>
</histogram>
<histogram name="Media.VideoCapture.GetDeviceInfosResult"
enum="GetDeviceInfosResult" expires_after="M118">
<owner>orphis@chromium.org</owner>
<owner>toprice@chromium.org</owner>
<summary>
Used to track the resolution of
ServiceVideoCaptureProvider::GetDeviceInfosAsync() and if a retry has been
used to get to the current result. See http://crbug.com/1379392.
</summary>
</histogram>
<histogram name="Media.VideoCapture.Height" units="pixels" expires_after="M120">
<owner>mcasas@chromium.org</owner>
<owner>handellm@chromium.org</owner>
<owner>jophba@chromium.org</owner>
<summary>
Video Capture Device captured frame height in pixels. The collection is made
in the VideoCaptureController upon reception of the first frame.
</summary>
</histogram>
<histogram name="Media.VideoCapture.Mac.Device.CapturedIOSurface"
enum="Boolean" expires_after="2023-03-19">
<owner>eshr@google.com</owner>
<owner>handellm@google.com</owner>
<summary>
A count of how often the capture device delivers an IOSurface to the capture
pipeline. This is recorded once per opening of the camera, when the first
video frame is captured.
</summary>
</histogram>
<histogram
name="Media.VideoCapture.Mac.Device.CapturedWithRequestedPixelFormat"
enum="Boolean" expires_after="2023-03-19">
<owner>eshr@google.com</owner>
<owner>handellm@google.com</owner>
<summary>
A boolean count of how often the requested pixel format is the one that was
actually captured. This is recorded once per opening of the camera, when the
first video frame is captured.
</summary>
</histogram>
<histogram name="Media.VideoCapture.Mac.Device.CapturedWithRequestedResolution"
enum="ResolutionComparison" expires_after="2023-04-23">
<owner>eshr@google.com</owner>
<owner>handellm@google.com</owner>
<summary>
An enumeration count of whether or not the requested resolution equals the
captured resolution, detailing which dimensions differ in the enum. This is
recorded once per opening of the camera, when the first video frame is
captured.
</summary>
</histogram>
<histogram name="Media.VideoCapture.Mac.Device.RequestedPixelFormat"
enum="VideoPixelFormatUnion" expires_after="2023-03-05">
<owner>eshr@google.com</owner>
<owner>handellm@google.com</owner>
<summary>
Counts the pixel formats requested by the VideoCaptureDevice on Mac. This is
recorded when the first video frame is captured.
</summary>
</histogram>
<histogram name="Media.VideoCapture.MacBook.AttemptCountWhenNoCamera"
units="attempts" expires_after="2020-03-15">
<owner>chfremer@chromium.org</owner>
<summary>
Indicates how many times Chrome has asked AVFoundation to enumerate devices
since the process start when zero devices are returned. This event is only
emitted for the first time that zero devices are returned since the process
start. This is used in the context of investigating http://crbug.com/582931.
</summary>
</histogram>
<histogram name="Media.VideoCapture.MacBook.HardwareVersionWhenNoCamera"
enum="MacBookVersions" expires_after="M82">
<owner>perkj@chromium.org</owner>
<summary>
MacBook hardware version used when Chrome cannot enumerate a video device.
This is used for tracking http://crbug.com/582931.
</summary>
</histogram>
<histogram name="Media.VideoCapture.MacBook.NumberOfDevices" units="devices"
expires_after="M82">
<owner>perkj@chromium.org</owner>
<summary>
Number of video capture devices detected by Chrome during device
enumeration. Zero devices indicate a problem since all MacBooks should have
a built-in camera. This is used for tracking http://crbug.com/582931.
</summary>
</histogram>
<histogram name="Media.VideoCapture.MaxFrameDropExceeded"
enum="VideoCaptureFrameDropReason" expires_after="M77">
<owner>chfremer@chromium.org</owner>
<summary>
An event for this histogram is emitted when a video capture session drops
more than
|VideoCaptureController::max_consecutive_frame_drop_for_same_reason_count()|
consecutive video frames for the same reason. After this event is emitted
once, no additional events are emitted for consecutively dropped frames for
the same reason until the count is reset by either a frame being delivered
successfully or a frame being dropped for a different reason. See also
Media.VideoCapture.FrameDrop.
</summary>
</histogram>
<histogram name="Media.VideoCapture.NumberOfClients" units="units"
expires_after="2021-12-12">
<owner>fbeaufort@chromium.org</owner>
<owner>guidou@chromium.org</owner>
<summary>
Number of times a video capture device is accessed simultaneously. Recorded
when video capturing starts.
</summary>
</histogram>
<histogram name="Media.VideoCapture.ScaleOverride" units="units"
expires_after="M120">
<owner>jophba@chromium.org</owner>
<owner>klausw@chromium.org</owner>
<summary>
The scalar multiplier used for adjusting the content size during tab capture
to align with the requested capture size, multiplied by 100. Recorded when
capture of a web contents is started, the content size of the capture
changes, and when capture stops.
</summary>
</histogram>
<histogram name="Media.VideoCapture.ScaleOverrideChangeCount" units="units"
expires_after="M120">
<owner>jophba@chromium.org</owner>
<owner>klausw@chromium.org</owner>
<summary>
The number of times the scale override changed in a single capture session.
Recorded when capture of a web contents is stopped.
</summary>
</histogram>
<histogram name="Media.VideoCapture.Start" enum="Boolean"
expires_after="2023-11-05">
<owner>toprice@chromium.org</owner>
<owner>guidou@chromium.org</owner>
<summary>
Counts the start attempts for video capture, to be compared with the
StartOutcome enum histogram.
</summary>
</histogram>
<histogram name="Media.VideoCapture.StartErrorCode" enum="VideoCaptureError"
expires_after="2023-11-19">
<owner>toprice@chromium.org</owner>
<owner>video-cmi-apis@google.com</owner>
<summary>
Counts detailed outcomes of first starting video capture, as a breakdown of
Media.VideoCapture.StartOutcome based on the error codes which caused
failures, or kNone if we started successfully. Can also be viewed as the
subset of reports to Media.VideoCapture.Error which occur before
VideoCaptureImpl first transitions to STARTED.
</summary>
</histogram>
<histogram name="Media.VideoCapture.StartOutcome"
enum="VideoCaptureStartOutcome" expires_after="2023-11-05">
<owner>toprice@chromium.org</owner>
<owner>guidou@chromium.org</owner>
<summary>
Counts the times Starting video capture results in success or failure (due
to eg timeouts etc).
</summary>
</histogram>
<histogram name="Media.VideoCapture.Width" units="pixels" expires_after="M120">
<owner>mcasas@chromium.org</owner>
<owner>handellm@chromium.org</owner>
<owner>jophba@chromium.org</owner>
<summary>
Video Capture Device captured frame width in pixels. The collection is made
in the VideoCaptureController upon reception of the first frame.
</summary>
</histogram>
<histogram name="Media.VideoCapture.Win.D3DDeviceRemovedReason" enum="Hresult"
expires_after="2024-05-10">
<owner>ilnik@chromium.org</owner>
<owner>video-cmi-mpp@chromium.org</owner>
<summary>
Error codes received by VideoCaptureDeviceMFWin when checking for D3D11
device removal reason.
</summary>
</histogram>
<histogram name="Media.VideoCapture.Win.Device.CapturePixelFormat"
enum="VideoPixelFormatUnion" expires_after="2024-03-19">
<owner>ilnik@google.com</owner>
<owner>video-cmi-mpp@google.com</owner>
<summary>
Counts the pixel formats produced by the VideoCaptureDevice on Windows. This
is recorded when the camera is opened.
</summary>
</histogram>
<histogram name="Media.VideoCapture.Win.Device.InternalPixelFormat"
enum="VideoPixelFormatUnion" expires_after="2024-06-04">
<owner>ilnik@google.com</owner>
<owner>video-cmi-mpp@google.com</owner>
<summary>
Counts the pixel formats used internaly by Windows VideoCaptureEngine. This
is recorded when the camera is opened.
</summary>
</histogram>
<histogram name="Media.VideoCapture.Win.Device.IsSharedTexture" enum="Boolean"
expires_after="2023-10-01">
<owner>ilnik@google.com</owner>
<owner>video-cmi-mpp@google.com</owner>
<summary>
Determine what proportion of frames might actually benefit from zero-copy on
Windows. This is recorded when the camera is opened and we get the texture
from IMFCaptureEngine.
</summary>
</histogram>
<histogram name="Media.VideoCapture.Win.Device.RequestedPixelFormat"
enum="VideoPixelFormatUnion" expires_after="2024-03-19">
<owner>ilnik@google.com</owner>
<owner>video-cmi-mpp@google.com</owner>
<summary>
Counts the pixel formats requested by the consumer on Windows. This is
recorded when the camera is opened.
</summary>
</histogram>
<histogram name="Media.VideoCapture.Win.DeviceFactory.CaptureApi"
enum="VideoCaptureApi" expires_after="2023-10-08">
<owner>ilnik@google.com</owner>
<owner>handellm@google.com</owner>
<owner>video-performance-team@google.com</owner>
<summary>
The Capture API that is used on Windows. This is recorded when the camera is
opened.
</summary>
</histogram>
<histogram name="Media.VideoCapture.Win.ErrorEvent" enum="Hresult"
expires_after="2023-11-05">
<owner>toprice@chromium.org</owner>
<owner>hta@chromium.org</owner>
<summary>
Error codes received by VideoCaptureDeviceMFWin on Windows which caused a
kWinMediaFoundationGetMediaEventStatusFailed error, ending video capture.
</summary>
</histogram>
<histogram name="Media.VideoCapture.Windows.BackendUsed"
enum="VideoCaptureWinBackendUsed" expires_after="M77">
<owner>chfremer@chromium.org</owner>
<summary>
Indicates which video capture backend is used on Windows. A count is
recorded each time a new VideoCaptureDeviceFactoryWin instance is created.
</summary>
</histogram>
<histogram base="true" name="Media.VideoCapture.Windows.ImageCaptureOutcome"
enum="ImageCaptureOutcome" expires_after="M85">
<owner>chfremer@chromium.org</owner>
<summary>
Counts number of times taking a still image on Windows fails/succeeds.
</summary>
</histogram>
<histogram
name="Media.VideoCapture.Windows.NumberOfRetriesNeededForMFGetAvailableDeviceMediaType"
units="retries" expires_after="M85">
<owner>chfremer@chromium.org</owner>
<summary>
Counts how many retries are needed for calls to MediaFoundation function
GetAvailableDeviceMediaType before getting a result different from
MF_E_INVALIDREQUEST or giving up.
</summary>
</histogram>
<histogram
name="Media.VideoCapture.Windows.NumberOfRetriesNeededForMFGetDeviceStreamCategory"
units="retries" expires_after="2023-03-26">
<owner>guidou@chromium.org</owner>
<owner>webrtc-dev@chromium.org</owner>
<summary>
Counts how many retries are needed for calls to MediaFoundation function
GetDeviceStreamCategory before getting a result different from
MF_E_INVALIDREQUEST or giving up.
</summary>
</histogram>
<histogram
name="Media.VideoCapture.Windows.NumberOfRetriesNeededForMFGetDeviceStreamCount"
units="retries" expires_after="2022-02-01">
<owner>guidou@chromium.org</owner>
<owner>webrtc-dev@chromium.org</owner>
<summary>
Counts how many retries are needed for calls to MediaFoundation function
GetDeviceStreamCount before getting a result different from
MF_E_INVALIDREQUEST or giving up.
</summary>
</histogram>
<histogram name="Media.VideoCaptureGpuJpegDecoder.InitDecodeSuccess"
enum="BooleanSuccess" expires_after="M77">
<owner>henryhsu@chromium.org</owner>
<summary>
Indicates whether we were successful in initializing hardware jpeg decoder
for attempts to VideoCaptureGpuJpegDecoder::Initialize().
</summary>
</histogram>
<histogram name="Media.VideoCaptureManager" units="ms" expires_after="M85">
<owner>mcasas@chromium.org</owner>
<summary>Measures the time taken for VideoCaptureManager::</summary>
</histogram>
<histogram name="Media.VideoCaptureManager.DesktopCaptureImplementationAndType"
enum="DesktopCaptureImplementationAndType" expires_after="2024-01-23">
<owner>handellm@chromium.org</owner>
<owner>ccameron@chromium.org</owner>
<summary>
Indicates which desktop capture implementation and DesktopID::Type was used
for a desktop capture session. Recorded on instantiation of the desktop
capturer.
</summary>
</histogram>
<histogram name="Media.VideoCaptureManager.DeviceSessionLockDuration"
units="ms" expires_after="2023-04-23">
<obsolete>
Removed 04/2023. No longer needed.
</obsolete>
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records the length of time the screen was locked while a device capture
session is active. An entry is recorded upon screen unlock or upon closure
of all active device capture sessions.
</summary>
</histogram>
<histogram name="Media.VideoCaptureManager.DeviceSessionWasLocked"
enum="Boolean" expires_after="2023-04-23">
<obsolete>
Removed 04/2023. No longer needed.
</obsolete>
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Indicates if a device capture session encountered a screen lock during its
lifetime. An entry is recorded once upon session closure.
</summary>
</histogram>
<histogram
name="Media.VideoCaptureService.DurationFromLastConnectToClosingConnectionAfterCapture"
units="ms" expires_after="M78">
<owner>chfremer@chromium.org</owner>
<summary>
Measures the duration from the time the Browser connected to the video
capture service to the time it closed the connection. Entries are only
logged if the service was used for creating an actual capture session as
opposed to enumerating devices only.
</summary>
</histogram>
<histogram
name="Media.VideoCaptureService.DurationFromLastConnectToClosingConnectionAfterEnumerationOnly"
units="ms" expires_after="M78">
<owner>chfremer@chromium.org</owner>
<summary>
Measures the duration from the time the Browser connected to the video
capture service to the time it closed the connection. Entries are only
logged if the service was used for enumerating devices only, but not for
creating an actual capture session.
</summary>
</histogram>
<histogram
name="Media.VideoCaptureService.DurationFromLastConnectToConnectionLost"
units="ms" expires_after="M78">
<owner>chfremer@chromium.org</owner>
<summary>
Measures the duration from the time the Browser connected to the video
capture service to the time the connection was lost.
</summary>
</histogram>
<histogram name="Media.VideoCaptureService.DurationUntilReconnectAfterCapture"
units="ms" expires_after="M77">
<owner>chfremer@chromium.org</owner>
<summary>
Measures the duration from the time the Browser last closed or lost
connection to the video capture service to the time it reconnects. This
duration only gets logged for reconnects after usage of the service for
capture (as opposed to enumeration-only usage).
</summary>
</histogram>
<histogram
name="Media.VideoCaptureService.DurationUntilReconnectAfterEnumerationOnly"
units="ms" expires_after="M78">
<owner>chfremer@chromium.org</owner>
<summary>
Measures the duration from the time the Browser last closed or lost
connection to the video capture service to the time it reconnects. This
duration only gets logged for reconnects after enumeration-only usage of the
service.
</summary>
</histogram>
<histogram name="Media.VideoCaptureService.Event"
enum="VideoCaptureServiceEvent" expires_after="M82">
<owner>chfremer@chromium.org</owner>
<summary>
Counts video capture service events, such as startup, shutdown, and
connection lost.
</summary>
</histogram>
<histogram name="Media.VideoCodec" enum="VideoCodec" expires_after="never">
<!-- expires-never: Codec support planning metric. -->
<owner>dalecurtis@chromium.org</owner>
<summary>Video codec used in HTML5 media.</summary>
</histogram>
<histogram name="Media.VideoDecoderFallback.{VideoCodec}"
enum="BooleanDidFallBack" expires_after="never">
<!-- expires-never: Media pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether Chrome had to fall back to a secondary video decoder with
{VideoCodec} video codec after the primary decoder failed reinitialization.
</summary>
<token key="VideoCodec" variants="VideoCodec"/>
</histogram>
<histogram name="Media.VideoDecodeStatsDB.OpSuccess.{DbOperation}"
enum="BooleanSuccess" expires_after="never">
<!-- expires-never: MediaCapabilities DB health metric. -->
<owner>chcunningham@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Indicates whether we were successful performing the operation to
{DbOperation}. Recorded once the operation completes.
</summary>
<token key="DbOperation" variants="DbOperation"/>
</histogram>
<histogram name="Media.VideoDecodeStatsDB.OpTiming.{DbOperation}"
units="microseconds" expires_after="never">
<!-- expires-never: MediaCapabilities DB health metric. -->
<owner>chcunningham@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Indicates duration of time performing the operation to {DbOperation}.
Recorded once the operation completes or times out. Reported for all users
regardless of clock resolution.
</summary>
<token key="DbOperation" variants="DbOperation"/>
</histogram>
<histogram name="Media.VideoFrameSubmitter" units="ms" expires_after="never">
<!-- expires-never: used by ChromeOS test infrastructure -->
<owner>mcasas@chromium.org</owner>
<owner>chromeos-gfx@chromium.org</owner>
<summary>
Delay between a VideoFrame being decoded and it being consumed by the OS
presentation API (on ChromeOS, this includes the display controller too).
</summary>
</histogram>
<histogram name="Media.VideoFrameSubmitter.PreSubmitBuffering" units="ms"
expires_after="never">
<!-- expires-never: used by ChromeOS test infrastructure -->
<owner>mcasas@chromium.org</owner>
<owner>chromeos-gfx@chromium.org</owner>
<summary>
Delay between a VideoFrame being decoded and it being handed over to the
CompositorFrameSink, essentially capturing the buffering in the Renderer.
This value is strictly included in Media.VideoFrameSubmitter
</summary>
</histogram>
<histogram name="Media.VideoHeight.Initial.{PlaybackType}" units="pixels"
expires_after="2024-04-11">
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The height of the first video frame in an HTML5 video for {PlaybackType}
playbacks. Reported when the first video frame is available.
</summary>
<token key="PlaybackType">
<variant name="All" summary="all"/>
<variant name="EME"/>
<variant name="MSE"/>
<variant name="SRC"/>
</token>
</histogram>
<histogram name="Media.VideoPersistence.AttemptResult"
enum="VideoPersistenceAttemptResult" expires_after="2021-09-19">
<owner>peconn@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Every time a video persistence session could be triggered, it records the
result of the attempt.
</summary>
</histogram>
<histogram name="Media.VideoPersistence.ControlsType"
enum="VideoPersistenceControlsType" expires_after="2021-09-19">
<owner>peconn@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Record the type of controls a persisted video is using. This is recorded
every time a video enters persistence mode
</summary>
</histogram>
<histogram name="Media.VideoPersistence.Duration" units="ms"
expires_after="M93">
<owner>peconn@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records the length during which a video was in a persistent state. It is
recorded once per video persistence session.
</summary>
</histogram>
<histogram name="Media.VideoPersistence.EndReason"
enum="VideoPersistenceEndReason" expires_after="2021-09-19">
<owner>peconn@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Records the reason why a video persistence session has ended.
</summary>
</histogram>
<histogram name="Media.VideoRenderer.CadenceChanges" units="changes"
expires_after="never">
<!-- expires-never: Media pipeline health metric. -->
<owner>dalecurtis@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Indicates how many cadence changes have occurred during playback, a zero
value is emitted at the beginning of playback. Subsequent values are emitted
during video rendering for each cadence change (up to a maximum of 10).
</summary>
</histogram>
<histogram name="Media.VideoRenderer.LowDelay" enum="Boolean"
expires_after="2022-09-11">
<obsolete>
Removed 09/2022. No longer needed.
</obsolete>
<owner>xhwang@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Indicates whether video is rendering in low delay mode. It's recorded when a
video starts playing.
</summary>
</histogram>
<histogram name="Media.VTVDA.HardwareAccelerated"
enum="BooleanHardwareAccelerated" expires_after="2023-10-01">
<owner>sandersd@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Whether a VTDecompressionSession is internally using hardware accelerated
decoding.
</summary>
</histogram>
<histogram name="Media.VTVDA.SessionFailureReason"
enum="VTVDASessionFailureType" expires_after="2023-10-15">
<owner>sandersd@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Count of VTVDA session failure reasons. Successful initializations are
counted as a special failure type. Since only successfully initialized
session can fail, failures rates are computed as a simple ratio.
</summary>
</histogram>
<histogram name="Media.WatchTime" units="ms" expires_after="2023-10-08">
<owner>dalecurtis@chromium.org</owner>
<summary>
Watch time is defined as the amount of elapsed media time for audio+video
media aggregated per player instance. A minimum of 7 seconds of unmuted,
foreground media must be watched to start watch time monitoring. Watch time
is checked on a regular basis and reported to UMA upon one of the stop
events mentioned below or at player destruction if none occur prior.
Any one of paused, hidden, or muted is sufficient to stop watch time metric
reports. Each of these has a hysteresis where if the state change is undone
within some time, the watch time will be counted as uninterrupted.
Power events (on/off battery power) have a similar hysteresis, but unlike
the aforementioned properties, will not stop metric collection.
Each seek event will result in a new watch time metric being started and the
old metric finalized as accurately as possible.
</summary>
</histogram>
<histogram name="Media.WebMediaPlayerImpl.HLS.HasAccessControl" enum="Boolean"
expires_after="2023-08-08">
<owner>cassew@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
When an HLS manifest is found during loading (on Android only), and the
response is CORS cross-origin, this histogram records whether the response
included an Access-Control-Allow-Origin header. Such requests are likely to
be supported by fetch() if the mode is correctly configured.
</summary>
</histogram>
<histogram name="Media.WebMediaPlayerImpl.HLS.IsCorsCrossOrigin" enum="Boolean"
expires_after="2023-08-08">
<owner>cassew@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
When an HLS manifest is found during loading (on Android only), records
whether the request was CORS cross-origin. These are cases that could not be
implemented using fetch(). Note: subresources referenced by the manifest are
not considered; they may have different origins or CORS configurations.
</summary>
</histogram>
<histogram name="Media.WebMediaPlayerImpl.HLS.IsMixedContent" enum="Boolean"
expires_after="2023-10-08">
<owner>cassew@chromium.org</owner>
<owner>tguilbert@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
When an HLS manifest is found during loading (on Android only), records
whether the request would be mixed content. These are cases that could not
be implemented using fetch(). Note: subresources referenced by the manifest
are not considered; they may have different origins.
</summary>
</histogram>
<histogram name="Media.WebMediaPlayerImpl.HLS{Variant}.MimeType"
enum="MimeTypeOfHlsManifest" expires_after="2023-08-08">
<owner>cassew@chromium.org</owner>
<owner>lukasza@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
When an HLS manifest is found during loading (on Android only), {Variant}
then this histogram records the MIME type of the response.
This metric should help assess the web compatibility risk of strict MIME
type enforcement, as discussed in
https://github.com/annevk/orb/issues/29#issuecomment-967432934
</summary>
<token key="Variant">
<variant name="" summary=""/>
<variant name=".CorsCrossOrigin"
summary="and the response is cross-origin/opaque,"/>
</token>
</histogram>
<histogram name="Media.WebMediaPlayerImpl.WatchTime"
enum="WebMediaPlayerWatchTimeType" expires_after="2021-08-01">
<obsolete>
Removed 09/2022.
</obsolete>
<owner>sandersd@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
Wall time of WebMediaPlayer playbacks. Each count represents one second of
media playback. Multiple WebMediaPlayer instances can together accumulate
watch time faster than real time.
</summary>
</histogram>
<histogram
name="Media.WebmMuxer.DidAdjustTimestamp.{StreamTypesRecorded}.{Domain}"
enum="Boolean" expires_after="2023-06-26">
<owner>handellm@google.com</owner>
<owner>video-performance-team@google.com</owner>
<summary>
Boolean indicating if {Domain} stream timestamps had to be corrected during
a muxing session with {StreamTypesRecorded} present. Reported on muxer
destructor.
</summary>
<token key="StreamTypesRecorded">
<variant name="AudioOnly"/>
<variant name="AudioVideo"/>
<variant name="VideoOnly"/>
</token>
<token key="Domain">
<variant name="Audio"/>
<variant name="Muxer"/>
<variant name="Video"/>
</token>
</histogram>
<histogram name="Media.WebrtcVideoPerfHistory.GetPerfInfoCodecProfile"
enum="VideoCodecProfile" expires_after="2024-02-01">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
The video codec profile that was used when calling GetPerfInfo. Recorded for
each call to GetPerfInfo if certain sanity checks pass.
</summary>
</histogram>
<histogram name="Media.WebrtcVideoPerfHistory.SavePerfRecordCodecProfile"
enum="VideoCodecProfile" expires_after="2024-02-01">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
The video codec profile that was provided to SavePerfRecord. Recorded for
each call to SavePerfRecord if certain sanity checks pass.
</summary>
</histogram>
<histogram name="Media.WebrtcVideoPerfHistory.SmoothPrediction.{Operation}"
units="custom" expires_after="2024-02-01">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Tracks how the smoothness prediction value was determined (smooth by
default, smooth from data, not smooth from data, implicitly smooth, smooth
override, or implicitly not smooth) multiplexed with the configuration
(codec, pixels, hardware_accelerated). See the code for details. This gives
a sparse histogram that is best interpreted using a script for
demultiplexing. The value is reported each time either encodingInfo() or
decodingInfo() are called and requests a smoothness prediction from
WebrtcVideoPerfHistory.
</summary>
<token key="Operation">
<variant name="Decode"/>
<variant name="Encode"/>
</token>
</histogram>
<histogram
name="Media.WebrtcVideoPerfHistory.SmoothVolatility.{Operation}.{Framerate}"
enum="SmoothVolatility" expires_after="2024-02-01">
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Tracks the volatilty of the smoothness predictions after updates to the
database, that is, if the smoothness prediction changes or stays at the same
value. Recorded after each update to the WebRTC MediaCapabilities database
if there was an existing record for the corresponding configuration.
</summary>
<token key="Operation">
<variant name="Decode"/>
<variant name="Encode"/>
</token>
<token key="Framerate">
<variant name="30fps"/>
<variant name="60fps"/>
</token>
</histogram>
<histogram name="Media.WebrtcVideoStatsDB.OpSuccess.{DbOperation}"
enum="BooleanSuccess" expires_after="never">
<!-- expires-never: WebRTC MediaCapabilities DB health metric. -->
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Indicates whether we were successful performing the operation to
{DbOperation}. Recorded once the operation completes.
</summary>
<token key="DbOperation" variants="DbOperation"/>
</histogram>
<histogram name="Media.WebrtcVideoStatsDB.OpTiming.{DbOperation}"
units="microseconds" expires_after="never">
<!-- expires-never: WebRTC MediaCapabilities DB health metric. -->
<owner>kron@chromium.org</owner>
<owner>webrtc-video@google.com</owner>
<summary>
Indicates duration of time performing the operation to {DbOperation}.
Recorded once the operation completes or times out. Reported for all users
regardless of clock resolution.
</summary>
<token key="DbOperation" variants="DbOperation"/>
</histogram>
<histogram name="Media.YouTube.TimeToBufferAv" units="ms" expires_after="M85">
<owner>Please list the metric's owners. Add more owner tags as needed.</owner>
<summary>
Time needed to pre-buffer A/V data before the actual playback for the
YouTube application.
</summary>
</histogram>
<histogram name="Media.YouTube.TimeToBufferAvAfterUnderrun" units="ms"
expires_after="M85">
<owner>Please list the metric's owners. Add more owner tags as needed.</owner>
<summary>
Time needed to buffer A/V data after an underrun for the YouTube
application.
</summary>
</histogram>
<histogram name="Media.{VaapiClientName}.VAAPIError" enum="VaapiFunctions"
expires_after="2024-05-16">
<owner>mcasas@chromium.org</owner>
<owner>chromeos-gfx-video@chromium.org</owner>
<summary>
Error codes reported by libva (via VaapiWrapper) while being used from the
specified client name. {VaapiClientName}
</summary>
<token key="VaapiClientName">
<variant name="VaapiImageDecodeAcceleratorWorker" summary=""/>
<variant name="VaapiImageProcessorBackend" summary=""/>
<variant name="VaapiJpegEncodeAccelerator" summary=""/>
<variant name="VaapiJpegEncodeAccelerator.Vpp" summary=""/>
<variant name="VaapiMjpegDecodeAccelerator" summary=""/>
<variant name="VaapiMjpegDecodeAccelerator.Vpp" summary=""/>
<variant name="VaapiVideoDecodeAccelerator" summary=""/>
<variant name="VaapiVideoDecodeAccelerator.Vpp" summary=""/>
<variant name="VaapiVideoDecoder" summary=""/>
<variant name="VaapiVideoEncodeAccelerator" summary=""/>
<variant name="VaapiVideoEncodeAccelerator.Vpp" summary=""/>
</token>
</histogram>
<histogram name="MediaGalleries.ScanCancelTime" units="ms" expires_after="M85">
<owner>vandebo@chromium.org</owner>
<summary>If a media scan was cancelled, the duration (in ms) it ran.</summary>
</histogram>
<histogram name="MediaGalleries.ScanDirectoriesFound" units="units"
expires_after="M85">
<owner>vandebo@chromium.org</owner>
<summary>
The number of directories with media files found during a scan.
</summary>
</histogram>
<histogram name="MediaGalleries.ScanFinishedTime" units="ms"
expires_after="M85">
<owner>vandebo@chromium.org</owner>
<summary>
Duration in milliseconds taken to do a media scan that ran to completion.
</summary>
</histogram>
<histogram name="MediaGalleries.ScanGalleriesGranted" units="%"
expires_after="M85">
<owner>vandebo@chromium.org</owner>
<summary>
The percentage of galleries accepted (not deselected) from the scan result
dialog.
</summary>
</histogram>
<histogram name="MediaGalleries.ScanGalleriesPopulated" units="units"
expires_after="M85">
<owner>vandebo@chromium.org</owner>
<summary>
The number of galleries added or updated in preferences after a scan.
</summary>
</histogram>
<histogram name="MediaGalleries.Usage" enum="MediaGalleriesUsageType"
expires_after="M77">
<owner>vandebo@chromium.org</owner>
<summary>Various usage counts for media galleries.</summary>
</histogram>
<histogram name="MediaLauncherActivity.LaunchResult" enum="BooleanSuccess"
expires_after="2021-06-19">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
True if the MediaLauncherActivity was successfully able to open the file.
Recorded when the MediaLauncherActivity starts the CustomTabActivity.
</summary>
</histogram>
<histogram name="MediaLauncherActivity.MediaType"
enum="MediaLauncherActivityMediaType" expires_after="2021-03-28">
<owner>steimel@chromium.org</owner>
<owner>media-dev@chromium.org</owner>
<summary>
The type of media that a user is opening via the MediaLauncherActivity.
</summary>
</histogram>
<histogram base="true" name="MediaRouter.Cast.App.Availability" units="ms"
expires_after="2024-05-01">
<!-- Name completed by histogram_suffixes name="MediaRouterSuccess" -->
<owner>takumif@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Round trip time for a Cast app availability request. Can be suffixed with
Success or Failure.
</summary>
</histogram>
<histogram name="MediaRouter.Cast.Channel.ConnectResult" enum="BooleanSuccess"
expires_after="2023-11-12">
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Whether opening Cast channel succeeds or not. Recorded when all opening
channel attempts (including retry attempts) finish.
</summary>
</histogram>
<histogram name="MediaRouter.Cast.Channel.Error"
enum="MediaRouterCastChannelError" expires_after="2023-11-12">
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Errors encountered on a Cast channel. Recorded when a Cast channel fails to
open, or when an opened channel fails to respond to keepalive ping request
and times out.
</summary>
</histogram>
<histogram name="MediaRouter.Cast.DeviceNameLength" units="characters"
expires_after="2022-05-01">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Records the length of the friendly name of a Cast device when we succeed to
open a Cast channel to it.
</summary>
</histogram>
<histogram name="MediaRouter.Cast.Discovery.ConnectedDevicesCount"
units="devices" expires_after="2023-08-27">
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
The number of connected Cast devices. Recorded when browser finishes
discovering Cast devices. Recording happens roughly once per hour.
</summary>
</histogram>
<histogram name="MediaRouter.Cast.Discovery.KnownDevicesCount" units="devices"
expires_after="2023-08-08">
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
The number of known Cast devices. Recorded when browser finishes discovering
Cast devices. Recording happens roughly once per hour.
</summary>
</histogram>
<histogram name="MediaRouter.Cast.Discovery.SinkSource"
enum="MediaRouterCastSinkSource" expires_after="2023-08-13">
<owner>btolsch@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>The source of discovery for a newly-created Cast sink.</summary>
</histogram>
<histogram name="MediaRouter.Cast.Feedback.Event"
enum="MediaRouterCastFeedbackEvent" expires_after="2022-05-01">
<owner>jrw@google.com</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Events related to the WebUI Cast feedback dialog.</summary>
</histogram>
<histogram name="MediaRouter.Cast.LaunchSessionRequest.SupportedAppTypes"
enum="ReceiverAppTypeSet" expires_after="2023-09-03">
<owner>muyaoxu@google.com</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
The types of apps supported by the sender page. Recorded when requesting the
receiver to launch a new session.
</summary>
</histogram>
<histogram name="MediaRouter.Cast.LaunchSessionResponse.AppType"
enum="MediaRouterResponseReceiverAppType" expires_after="2023-10-01">
<owner>muyaoxu@google.com</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
The type of app that the receiver device choose to launch. Recorded when
receiving a receiver status response to the launch request.
</summary>
</histogram>
<histogram name="MediaRouter.Cast.Mdns.Channel.Open_Failure" units="ms"
expires_after="2023-09-03">
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Duration in milliseconds taken to fail to open a cast channel. Recorded when
one opening channel attempt fails.
</summary>
</histogram>
<histogram name="MediaRouter.Cast.Mdns.Channel.Open_Success" units="ms"
expires_after="2023-09-03">
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Duration in milliseconds taken to successfully open a cast channel. Recorded
when one opening channel attempt succeeds.
</summary>
</histogram>
<histogram name="MediaRouter.Cast.PendingUserAuthLatency" units="s"
expires_after="2023-08-20">
<owner>ahmedmoussa@google.com</owner>
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
In some scenarios casting doesn't start until the user approves it on the
receiver side. This histogram records the time it takes between requesting
to start casting and receiving a response from the receiver that it is now
waiting for user approval.
</summary>
</histogram>
<histogram name="MediaRouter.Cast.UserPromptWhenLaunchingCast"
enum="MediaRouterUserPromptWhenLaunchingCast" expires_after="2023-08-20">
<owner>ahmedmoussa@google.com</owner>
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
This histogram is recorded whenever the user attempts to start casting and a
receiver-side prompt is shown, and when the user disapproves it. The other
two cases, when the user approves it or when it times out, are not recorded.
As both these cases can be received without a prompt before it and this
should not be recorded.
</summary>
</histogram>
<histogram name="MediaRouter.CastStreaming.Audio.PlaybackOnReceiver"
enum="Boolean" expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>muyaoxu@google.com</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Records whether audio is played on the receiver device. If not, then on the
sender side. Recorded when a new site-initiated mirroring session is
started.
</summary>
</histogram>
<histogram name="MediaRouter.CastStreaming.Session.Launch" units="ms"
expires_after="2023-10-08">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Total time to launch a Cast Streaming mirror session.</summary>
</histogram>
<histogram name="MediaRouter.CastStreaming.Session.Length" units="ms"
expires_after="2023-10-08">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Total length of a Cast Streaming mirror session of any type, including the
time spent in media remoting.
</summary>
</histogram>
<histogram name="MediaRouter.CastStreaming.Session.Length.AccessCode"
units="ms" expires_after="2023-11-12">
<owner>bzielinski@google.com</owner>
<owner>cros-edu-eng@google.com</owner>
<summary>
Total length of a Cast Streaming mirror session of any type, when the cast
sink was discovered via access code.
</summary>
</histogram>
<histogram name="MediaRouter.CastStreaming.Session.Length.File" units="ms"
expires_after="2022-07-01">
<obsolete>
Removed 04/2022 as local file casting is no longer done via the Cast UI.
</obsolete>
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Total length of a Cast Streaming File mirror session.</summary>
</histogram>
<histogram name="MediaRouter.CastStreaming.Session.Length.OffscreenTab"
units="ms" expires_after="2024-05-01">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Total length of a Cast Streaming Offscreen Tab mirror session.
</summary>
</histogram>
<histogram name="MediaRouter.CastStreaming.Session.Length.Screen" units="ms"
expires_after="2024-05-01">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Total length of a Cast Streaming Screen mirror session.</summary>
</histogram>
<histogram name="MediaRouter.CastStreaming.Session.Length.Tab" units="ms"
expires_after="2024-05-01">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Total length of a Cast Streaming mirror session of type Tab and NOT of types
offscreen tab or local file. This includes the time spent in media remoting.
</summary>
</histogram>
<histogram name="MediaRouter.CastStreaming.Start.Failure.AccessCodeManualEntry"
enum="MirroringServiceErrorType" expires_after="2023-07-01">
<owner>bzielinski@google.com</owner>
<owner>cros-edu-eng@google.com</owner>
<summary>
Whenever a Cast Streaming session to a device discovered by access code
manual entry fails to start, record the error associated with the event.
</summary>
</histogram>
<histogram
name="MediaRouter.CastStreaming.Start.Failure.AccessCodeRememberedDevice"
enum="MirroringServiceErrorType" expires_after="2023-07-01">
<owner>bzielinski@google.com</owner>
<owner>cros-edu-eng@google.com</owner>
<summary>
Whenever a Cast Streaming session to a device discovered by access code and
remembered via caching fails to start, record the error associated with the
event.
</summary>
</histogram>
<histogram name="MediaRouter.CastStreaming.Start.Failure.Native"
enum="MirroringServiceErrorType" expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Whenever a Cast Streaming session fails to start, record the error
associated with the event. This is recorded only for the native Cast MRP.
See MediaRouter.CastStreaming.Start.Failure for the extension MRP.
</summary>
</histogram>
<histogram name="MediaRouter.CastStreaming.Start.Success" enum="MirrorType"
expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Whenever a Cast Streaming session is successfully started, record if it was
for a Tab or Desktop mirroring session.
</summary>
</histogram>
<histogram name="MediaRouter.CastStreaming.Start.Success.AccessCodeManualEntry"
enum="MirrorType" expires_after="2023-11-12">
<owner>bzielinski@google.com</owner>
<owner>cros-edu-eng@google.com</owner>
<summary>
Whenever a Cast Streaming session is successfully started, when the device
was discovered by access code maual entry, record if it was for a Tab or
Desktop mirroring session.
</summary>
</histogram>
<histogram
name="MediaRouter.CastStreaming.Start.Success.AccessCodeRememberedDevice"
enum="MirrorType" expires_after="2023-08-20">
<owner>bzielinski@google.com</owner>
<owner>cros-edu-eng@google.com</owner>
<summary>
Whenever a Cast Streaming session is successfully started, when the device
was discovered by access code remembered device caching, record if it was
for a Tab or Desktop mirroring session.
</summary>
</histogram>
<histogram name="MediaRouter.Dial.AvailableDevicesCount" units="devices"
expires_after="2023-09-03">
<owner>mfoltz@chromium.org</owner>
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
The number of available DIAL devices. Recorded when browser finishes
discovering DIAL devices. Recording happens roughly once per hour.
</summary>
</histogram>
<histogram name="MediaRouter.Dial.CreateRoute"
enum="MediaRouterDialCreateRouteResult" expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
The result of a DIAL CreateRoute request. Recorded when the user requests to
create a media route to a DIAL device.
</summary>
</histogram>
<histogram name="MediaRouter.Dial.DeviceDescriptionParsingResult"
enum="MediaRouterDeviceDescriptionParsingResult" expires_after="2024-04-16">
<owner>takumif@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Result from parsing DIAL device description XML text. Recorded when utility
process returns a DIAL device description object to the DIAL Media Route
Provider.
</summary>
</histogram>
<histogram name="MediaRouter.Dial.FetchAppInfo"
enum="MediaRouterDialFetchAppInfoResult" expires_after="2023-10-22">
<owner>takumif@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
The result of a DIAL app info request. Recorded when an app info request is
issued to a DIAL device.
</summary>
</histogram>
<histogram name="MediaRouter.Dial.KnownDevicesCount" units="devices"
expires_after="2023-09-10">
<owner>takumif@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
The number of known DIAL devices. Recorded when browser finishes discovering
DIAL devices. Recording happens roughly once per hour.
</summary>
</histogram>
<histogram name="MediaRouter.Dial.ParsingError"
enum="MediaRouterDialParsingError" expires_after="2023-04-05">
<obsolete>
Replaced by MediaRouter.Dial.DeviceDescriptionParsingResult.
</obsolete>
<owner>takumif@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Error encountered while parsing DIAL device description XML text. Recorded
when utility process returns an invalid DIAL device description object to
browser.
</summary>
</histogram>
<histogram name="MediaRouter.Icon.Click.Location"
enum="MediaRouterDialogActivationLocation" expires_after="2024-04-30">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>Location the user clicked to open the Media Router dialog.</summary>
</histogram>
<histogram name="MediaRouter.MirroringService.SessionError"
enum="MirroringServiceErrorType" expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Records errors encountered by the Mirroring Service. If an error occurs
while media remoting, the service attempts to revert to mirroring. Otherwise
mirroring is terminated.
</summary>
</histogram>
<histogram name="MediaRouter.PresentationRequest.AvailabilityUrlType"
enum="PresentationUrlType" expires_after="2023-11-19">
<owner>takumif@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
The type of Presentation URL used in a PresentationRequest by a web page.
</summary>
</histogram>
<histogram name="MediaRouter.PresentationRequest.UrlBySink"
enum="PresentationUrlBySink" expires_after="2023-07-18">
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Logged when the Media Router starts a presentation according to the type of
presentation URL and the type of media sink.
</summary>
</histogram>
<histogram name="MediaRouter.Provider.CreateRoute.Result"
enum="MediaRouteProviderResult" expires_after="2023-10-22">
<!-- Name completed by histogram_suffixes name="MediaRouteProvider" -->
<owner>takumif@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Result of a request to a MediaRouteProvider to create a route.
CreateRoute.Result (without a suffix) is recorded for the extension or an
unknown MRP.
</summary>
</histogram>
<histogram name="MediaRouter.Provider.JoinRoute.Result"
enum="MediaRouteProviderResult" expires_after="2024-06-04">
<!-- Name completed by histogram_suffixes name="MediaRouteProvider" -->
<owner>takumif@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Result of a request to a MediaRouteProvider to join a route.
JoinRoute.Result (without a suffix) is recorded for the extension or an
unknown MRP.
</summary>
</histogram>
<histogram name="MediaRouter.Provider.TerminateRoute.Result"
enum="MediaRouteProviderResult" expires_after="2024-05-01">
<!-- Name completed by histogram_suffixes name="MediaRouteProvider" -->
<owner>takumif@chromium.org</owner>
<owner>mfoltz@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Result of a request to a MediaRouteProvider to terminate a route.
TerminateRoute.Result (without a suffix) is recorded for the extension or an
unknown MRP.
</summary>
</histogram>
<histogram name="MediaRouter.RemotePlayback.SessionLoadTime" units="ms"
expires_after="2023-12-01">
<owner>muyaoxu@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Measures how long, from the start of a streaming session, until it switches
to Remoting for Remote Playback sessions. The start time is measured when
the streaming session has started and the end time is measured when the
remoting starts. The metric is recorded when both the start time and end
time are measured and duration time is calculated.
</summary>
</histogram>
<histogram name="MediaRouter.RemotePlayback.SessionStartsBeforeTimeout"
enum="Boolean" expires_after="2023-12-01">
<owner>muyaoxu@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Whether Remoting starts before it timeouts for Remote Playback sessions.
Recorded when the timeout callback is fired and when Remoting starts.
</summary>
</histogram>
<histogram name="MediaRouter.RemotePlayback.SinkCapability.SupportedAudioCodec"
enum="AudioCodec" expires_after="2023-12-01">
<owner>muyaoxu@google.com</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Recorded when a Cast sink is discovered for a Remote Playback MediaSource
and this sink supports the MediaSource's AudioCodec. It is not recorded if
the model is not known to support Remoting, in which case the sink's audio
capability is unknown.
</summary>
</histogram>
<histogram name="MediaRouter.RemotePlayback.SinkCapability.SupportedVideoCodec"
enum="VideoCodec" expires_after="2023-12-01">
<owner>muyaoxu@google.com</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Recorded when a Cast sink is discovered for a Remote Playback MediaSource
and this sink supports the MediaSource's VideoCodec. It is not recorded if
the model is not known to support Remoting, in which case the sink's video
capability is unknown.
</summary>
</histogram>
<histogram
name="MediaRouter.RemotePlayback.SinkCapability.UnsupportedAudioCodec"
enum="AudioCodec" expires_after="2023-12-01">
<owner>muyaoxu@google.com</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Recorded when a Cast sink is discovered for a Remote Playback MediaSource
and this sink does not support the MediaSource's AudioCodec. It is not
recorded if the model is not known to support Remoting, in which case the
sink's audio capability is unknown.
</summary>
</histogram>
<histogram
name="MediaRouter.RemotePlayback.SinkCapability.UnsupportedVideoCodec"
enum="VideoCodec" expires_after="2023-12-01">
<owner>muyaoxu@google.com</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Recorded when a Cast sink is discovered for a Remote Playback MediaSource
and this sink does not support the MediaSource's VideoCodec. It is not
recorded if the model is not known to support Remoting, in which case the
sink's video capability is unknown.
</summary>
</histogram>
<histogram name="MediaRouter.RemotePlayback.SinkModelCompatibility"
enum="Boolean" expires_after="2023-12-01">
<owner>muyaoxu@google.com</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Records whether the discovered sink is known to support Media Remoting. It
is recorded when media sink query results are sent to the
CastMediaRouteProvider.
</summary>
</histogram>
<histogram name="MediaRouter.Sink.SelectedType" enum="MediaSinkType"
expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
The type of the Media Sink that media is being cast to. Recorded each time
the user selects a Media Sink to start casting. Recorded for all the UI
entry points.
</summary>
</histogram>
<histogram name="MediaRouter.Sink.SelectedType.{Ui}" enum="MediaSinkType"
expires_after="2024-05-03">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
The type of the Media Sink that media is being cast to. Recorded each time
the user selects a Media Sink to start casting from {Ui}.
</summary>
<token key="Ui">
<variant name="CastHarmony"/>
<variant name="GlobalMediaControls"/>
</token>
</histogram>
<histogram name="MediaRouter.Source.CastingSource"
enum="MediaRouterSourceTypes" expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
The source of a Media Router session. This is recorded to keep track of what
kind of media is being streamed.
</summary>
</histogram>
<histogram name="MediaRouter.Ui.Action.CloseLatency" units="ms"
expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Duration in milliseconds taken from the user opening the Media Router dialog
to the user closing the dialog. This is only recorded if closing the dialog
is the first action the user takes.
</summary>
</histogram>
<histogram name="MediaRouter.Ui.Action.StartLocal.Latency" units="ms"
expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Duration in milliseconds taken from the Media Router dialog showing the sink
list and being populated with at least one device to the user selecting a
device immediately after to create a new route.
</summary>
</histogram>
<histogram name="MediaRouter.Ui.Action.StartLocalPosition"
enum="MediaRouterSinkPositionLabel" expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>The index of the sink that was selected in the sink list.</summary>
</histogram>
<histogram name="MediaRouter.Ui.Action.StopRoute" enum="MediaRouteType"
expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>The number of times a user stops different types of routes.</summary>
</histogram>
<histogram name="MediaRouter.Ui.Android.DialogAction"
enum="MediaRouterAndroidDialogAction" expires_after="2024-05-01">
<owner>muyaoxu@google.com</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
A Mediarouter dialog can be two types: (1) A route controller dialog where
users can stop casting. (2) A device picker where users can select a device
and cast to it. This histogram records when users interact with the dialog
(start or stop casting).
</summary>
</histogram>
<histogram name="MediaRouter.Ui.Android.DialogType"
enum="MediaRouterAndroidDialogType" expires_after="2024-05-01">
<owner>muyaoxu@google.com</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
A MediaRouter dialog is opened when users click on the Cast buttons supplied
by the Cast SDK or the default HTML media player. This histogram records the
type of the dialog when the dialog is created.
</summary>
</histogram>
<histogram name="MediaRouter.Ui.Device.Count" units="units"
expires_after="2023-10-22">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Counts the number of devices known and populated to the Media Router dialog
(or the Global Media Controls' device picker) three seconds after the dialog
loads. Always expected to be non-negative. This includes data recorded from
Clank, which uses Android's MediaRouter framework.
</summary>
</histogram>
<histogram name="MediaRouter.Ui.Dialog.ActivationLocationAndCastMode"
enum="MediaRouterDialogActivationLocationAndCastMode"
expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
This records how the Cast dialog was opened and what Cast mode was used
whenever a Cast session starts.
</summary>
</histogram>
<histogram name="MediaRouter.Ui.Dialog.IconStateAtOpen"
enum="MediaRouterIconState" expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Whether the Cast toolbar icon is in its ephemeral state (shown only when the
feature is active), or is pinned to the toolbar by user pref / admin policy.
</summary>
</histogram>
<histogram name="MediaRouter.Ui.Dialog.LoadedWithData" units="ms"
expires_after="2024-05-03">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Duration in milliseconds taken from the user click to open the Media Router
dialog to initializing the dialog with data.
</summary>
</histogram>
<histogram name="MediaRouter.Ui.Dialog.Paint" units="ms"
expires_after="2023-11-12">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Duration in milliseconds taken from a user click to open the Media Router
dialog to the initial paint.
</summary>
</histogram>
<histogram name="MediaRouter.Ui.FirstAction" enum="MediaRouterUserAction"
expires_after="2023-07-09">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
The first action taken by the user after opening the Media Router dialog.
</summary>
</histogram>
<histogram name="MediaRouter.Ui.IconStateAtInit" enum="MediaRouterIconState"
expires_after="2023-07-09">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
Whether the Cast toolbar icon is in its ephemeral state (shown only when the
feature is active), or is pinned to the toolbar by user pref / admin policy.
Recorded whenever the browser is initialized for a regular (not incognito or
guest) profile.
</summary>
</histogram>
<histogram name="MediaRouter.WiredDisplay.AvailableDevicesCount" units="units"
expires_after="2023-08-20">
<owner>takumif@chromium.org</owner>
<owner>openscreen-eng@google.com</owner>
<summary>
The number of Media Sinks available for Casting a Presentation API URL to
local screens. Recorded at most once an hour, when the Wired Display Media
Route Provider reports an update on the sink count.
</summary>
</histogram>
</histograms>
</histogram-configuration>