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chromium / chromium / src / 0a75b84f23057006f59e05c83b47a258bc9a1769 / . / media / filters / source_buffer_stream.cc
blob: 5f81e53ffdc80baa064aaeea945b845afdcd3bca [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/filters/source_buffer_stream.h"
#include <algorithm>
#include <map>
#include <memory>
#include <sstream>
#include <string>
#include "base/bind.h"
#include "base/logging.h"
#include "base/metrics/histogram_macros.h"
#include "base/trace_event/trace_event.h"
#include "media/base/demuxer_memory_limit.h"
#include "media/base/media_switches.h"
#include "media/base/timestamp_constants.h"
namespace media {
namespace {
// The minimum interbuffer decode timestamp delta (or buffer duration) for use
// in fudge room for range membership, adjacency and coalescing.
const int kMinimumInterbufferDistanceInMs = 1;
// Limit the number of MEDIA_LOG() logs for track buffer time gaps.
const int kMaxTrackBufferGapWarningLogs = 20;
// Limit the number of MEDIA_LOG() logs for MSE GC algorithm warnings.
const int kMaxGarbageCollectAlgorithmWarningLogs = 20;
// Limit the number of MEDIA_LOG() logs for splice overlap trimming.
const int kMaxAudioSpliceLogs = 20;
// Helper method that returns true if |ranges| is sorted in increasing order,
// false otherwise.
bool IsRangeListSorted(const SourceBufferStream::RangeList& ranges) {
base::TimeDelta prev = kNoTimestamp;
for (const auto& range_ptr : ranges) {
if (prev != kNoTimestamp && prev >= range_ptr->GetStartTimestamp())
return false;
prev = range_ptr->GetBufferedEndTimestamp();
}
return true;
}
// Returns an estimate of how far from the beginning or end of a range a buffer
// can be to still be considered in the range, given the |approximate_duration|
// of a buffer in the stream.
// TODO(wolenetz): Once all stream parsers emit accurate frame durations, use
// logic like FrameProcessor (2*last_frame_duration + last_decode_timestamp)
// instead of an overall maximum interbuffer delta for range discontinuity
// detection.
// See http://crbug.com/351489 and http://crbug.com/351166.
base::TimeDelta ComputeFudgeRoom(base::TimeDelta approximate_duration) {
// Because we do not know exactly when is the next timestamp, any buffer
// that starts within 2x the approximate duration of a buffer is considered
// within this range.
return 2 * approximate_duration;
}
// The amount of time the beginning of the buffered data can differ from the
// start time in order to still be considered the start of stream.
base::TimeDelta kSeekToStartFudgeRoom() {
return base::TimeDelta::FromMilliseconds(1000);
}
// Helper method for logging.
std::string StatusToString(const SourceBufferStreamStatus& status) {
switch (status) {
case SourceBufferStreamStatus::kSuccess:
return "kSuccess";
case SourceBufferStreamStatus::kNeedBuffer:
return "kNeedBuffer";
case SourceBufferStreamStatus::kConfigChange:
return "kConfigChange";
case SourceBufferStreamStatus::kEndOfStream:
return "kEndOfStream";
}
NOTREACHED();
return "";
}
// Helper method for logging, converts a range into a readable string.
std::string RangeToString(const SourceBufferRange& range) {
if (range.size_in_bytes() == 0) {
return "[]";
}
std::stringstream ss;
ss << "[" << range.GetStartTimestamp().InMicroseconds() << "us;"
<< range.GetEndTimestamp().InMicroseconds() << "us("
<< range.GetBufferedEndTimestamp().InMicroseconds() << "us)]";
return ss.str();
}
// Helper method for logging, converts a set of ranges into a readable string.
std::string RangesToString(const SourceBufferStream::RangeList& ranges) {
if (ranges.empty())
return "<EMPTY>";
std::stringstream ss;
for (const auto& range_ptr : ranges) {
if (range_ptr != ranges.front())
ss << " ";
ss << RangeToString(*range_ptr);
}
return ss.str();
}
std::string BufferQueueBuffersToLogString(
const SourceBufferStream::BufferQueue& buffers) {
std::stringstream result;
result << "Buffers:\n";
for (const auto& buf : buffers) {
result << "\tdts=" << buf->GetDecodeTimestamp().InMicroseconds() << " "
<< buf->AsHumanReadableString()
<< ", is_duration_estimated=" << buf->is_duration_estimated()
<< "\n";
}
return result.str();
}
std::string BufferQueueMetadataToLogString(
const SourceBufferStream::BufferQueue& buffers) {
std::stringstream result;
base::TimeDelta pts_interval_start;
base::TimeDelta pts_interval_end;
SourceBufferStream::GetTimestampInterval(buffers, &pts_interval_start,
&pts_interval_end);
result << "dts=[" << buffers.front()->GetDecodeTimestamp().InMicroseconds()
<< "us;" << buffers.back()->GetDecodeTimestamp().InMicroseconds()
<< "us(last frame dur=" << buffers.back()->duration().InMicroseconds()
<< "us)], pts interval=[" << pts_interval_start.InMicroseconds()
<< "us," << pts_interval_end.InMicroseconds() << "us)";
return result.str();
}
SourceBufferRange::GapPolicy TypeToGapPolicy(SourceBufferStreamType type) {
switch (type) {
case SourceBufferStreamType::kAudio:
case SourceBufferStreamType::kVideo:
return SourceBufferRange::NO_GAPS_ALLOWED;
case SourceBufferStreamType::kText:
return SourceBufferRange::ALLOW_GAPS;
}
NOTREACHED();
return SourceBufferRange::NO_GAPS_ALLOWED;
}
} // namespace
SourceBufferStream::SourceBufferStream(const AudioDecoderConfig& audio_config,
MediaLog* media_log)
: media_log_(media_log),
seek_buffer_timestamp_(kNoTimestamp),
coded_frame_group_start_pts_(kNoTimestamp),
range_for_next_append_(ranges_.end()),
highest_output_buffer_timestamp_(kNoTimestamp),
max_interbuffer_distance_(
base::TimeDelta::FromMilliseconds(kMinimumInterbufferDistanceInMs)),
memory_limit_(GetDemuxerStreamAudioMemoryLimit()) {
DCHECK(audio_config.IsValidConfig());
audio_configs_.push_back(audio_config);
}
SourceBufferStream::SourceBufferStream(const VideoDecoderConfig& video_config,
MediaLog* media_log)
: media_log_(media_log),
seek_buffer_timestamp_(kNoTimestamp),
coded_frame_group_start_pts_(kNoTimestamp),
range_for_next_append_(ranges_.end()),
highest_output_buffer_timestamp_(kNoTimestamp),
max_interbuffer_distance_(
base::TimeDelta::FromMilliseconds(kMinimumInterbufferDistanceInMs)),
memory_limit_(GetDemuxerStreamVideoMemoryLimit()) {
DCHECK(video_config.IsValidConfig());
video_configs_.push_back(video_config);
}
SourceBufferStream::SourceBufferStream(const TextTrackConfig& text_config,
MediaLog* media_log)
: media_log_(media_log),
text_track_config_(text_config),
seek_buffer_timestamp_(kNoTimestamp),
coded_frame_group_start_pts_(kNoTimestamp),
range_for_next_append_(ranges_.end()),
highest_output_buffer_timestamp_(kNoTimestamp),
max_interbuffer_distance_(
base::TimeDelta::FromMilliseconds(kMinimumInterbufferDistanceInMs)),
memory_limit_(GetDemuxerStreamAudioMemoryLimit()) {}
SourceBufferStream::~SourceBufferStream() = default;
void SourceBufferStream::OnStartOfCodedFrameGroup(
base::TimeDelta coded_frame_group_start_pts) {
DVLOG(1) << __func__ << " " << GetStreamTypeName() << " (pts "
<< coded_frame_group_start_pts.InMicroseconds() << "us)";
DCHECK(!end_of_stream_);
coded_frame_group_start_pts_ = coded_frame_group_start_pts;
new_coded_frame_group_ = true;
auto last_range = range_for_next_append_;
range_for_next_append_ = FindExistingRangeFor(coded_frame_group_start_pts_);
// Only reset |last_appended_buffer_timestamp_| if this new coded frame group
// is not adjacent to the previous coded frame group appended to the stream.
if (range_for_next_append_ == ranges_.end() ||
!IsNextGopAdjacentToEndOfCurrentAppendSequence(
coded_frame_group_start_pts_)) {
ResetLastAppendedState();
DVLOG(3) << __func__ << " next appended buffers will "
<< (range_for_next_append_ == ranges_.end()
? "be in a new range"
: "overlap an existing range");
if (range_for_next_append_ != ranges_.end()) {
// If this new coded frame group overlaps an existing range, preserve
// continuity from that range to the new group by moving the start time
// earlier (but not at or beyond the most recent buffered frame's time
// before |coded_frame_group_start_pts_| in the range, and not beyond the
// range's start time. This update helps prevent discontinuity from being
// introduced by the ::RemoveInternal processing during the next ::Append
// call.
base::TimeDelta adjusted_start_time =
(*range_for_next_append_)
->FindHighestBufferedTimestampAtOrBefore(
coded_frame_group_start_pts_);
if (adjusted_start_time < coded_frame_group_start_pts_) {
// Exclude removal of that earlier frame during later Append
// processing by adjusting the removal range slightly forward.
coded_frame_group_start_pts_ =
adjusted_start_time + base::TimeDelta::FromMicroseconds(1);
}
}
} else if (last_range != ranges_.end()) {
DCHECK(last_range == range_for_next_append_);
DVLOG(3) << __func__ << " next appended buffers will continue range unless "
<< "intervening remove makes discontinuity";
}
}
void SourceBufferStream::Append(const BufferQueue& buffers) {
TRACE_EVENT2("media", "SourceBufferStream::Append",
"stream type", GetStreamTypeName(),
"buffers to append", buffers.size());
DCHECK(!buffers.empty());
DCHECK(coded_frame_group_start_pts_ != kNoTimestamp);
DCHECK(!end_of_stream_);
DVLOG(1) << __func__ << " " << GetStreamTypeName() << ": buffers "
<< BufferQueueMetadataToLogString(buffers);
DVLOG(4) << BufferQueueBuffersToLogString(buffers);
DCHECK(!buffers.front()->is_key_frame() ||
coded_frame_group_start_pts_ <= buffers.front()->timestamp());
DVLOG_IF(2, coded_frame_group_start_pts_ > buffers.front()->timestamp())
<< __func__
<< " Suspected SAP-Type-2 occurrence: coded_frame_group_start_pts_="
<< coded_frame_group_start_pts_.InMicroseconds()
<< "us, first new buffer has timestamp="
<< buffers.front()->timestamp().InMicroseconds() << "us";
// New coded frame groups emitted by the coded frame processor must begin with
// a keyframe. Avoid propagating with escalating impact if this assumption is
// broken.
CHECK(!new_coded_frame_group_ || buffers.front()->is_key_frame());
// Buffers within each GOP in a coded frame group must be monotonically
// increasing in DTS order.
DCHECK(IsDtsMonotonicallyIncreasing(buffers));
// Both of these checks enforce what should be guaranteed by how
// FrameProcessor signals OnStartOfCodedFrameGroup and the buffers it tells us
// to Append.
DCHECK(coded_frame_group_start_pts_ >= base::TimeDelta());
DCHECK(buffers.front()->timestamp() >= base::TimeDelta());
if (UpdateMaxInterbufferDtsDistance(buffers)) {
// Coalesce |ranges_| using the new fudge room. This helps keep |ranges_|
// sorted in complex scenarios. See https://crbug.com/793247.
MergeAllAdjacentRanges();
}
SetConfigIds(buffers);
// Save a snapshot of stream state before range modifications are made.
base::TimeDelta next_buffer_timestamp = GetNextBufferTimestamp();
BufferQueue deleted_buffers;
PrepareRangesForNextAppend(buffers, &deleted_buffers);
// If there's a range for |buffers|, insert |buffers| accordingly. Otherwise,
// create a new range with |buffers|.
if (range_for_next_append_ != ranges_.end()) {
if (new_coded_frame_group_) {
// If the first append to this stream in a new coded frame group continues
// a previous range, use the new group's start time instead of the first
// new buffer's timestamp as the proof of adjacency to the existing range.
// A large gap (larger than our normal buffer adjacency test) can occur in
// a muxed set of streams (which share a common coded frame group start
// time) with a significantly jagged start across the streams.
(*range_for_next_append_)
->AppendBuffersToEnd(buffers, coded_frame_group_start_pts_);
} else {
// Otherwise, use the first new buffer as proof of adjacency.
(*range_for_next_append_)->AppendBuffersToEnd(buffers, kNoTimestamp);
}
last_appended_buffer_timestamp_ = buffers.back()->timestamp();
last_appended_buffer_duration_ = buffers.back()->duration();
last_appended_buffer_is_keyframe_ = buffers.back()->is_key_frame();
last_appended_buffer_decode_timestamp_ =
buffers.back()->GetDecodeTimestamp();
highest_timestamp_in_append_sequence_ =
(*range_for_next_append_)->GetEndTimestamp();
highest_buffered_end_time_in_append_sequence_ =
(*range_for_next_append_)->GetBufferedEndTimestamp();
} else {
base::TimeDelta new_range_start_time =
std::min(coded_frame_group_start_pts_, buffers.front()->timestamp());
const BufferQueue* buffers_for_new_range = &buffers;
BufferQueue trimmed_buffers;
// If the new range is not being created because of a new coded frame group,
// then we must make sure that we start with a key frame. This can happen
// if the GOP in the previous append gets destroyed by a Remove() call.
if (!new_coded_frame_group_) {
BufferQueue::const_iterator itr = buffers.begin();
// Scan past all the non-key-frames.
while (itr != buffers.end() && !(*itr)->is_key_frame()) {
++itr;
}
// If we didn't find a key frame, then update the last appended
// buffer state and return.
if (itr == buffers.end()) {
last_appended_buffer_timestamp_ = buffers.back()->timestamp();
last_appended_buffer_duration_ = buffers.back()->duration();
last_appended_buffer_is_keyframe_ = buffers.back()->is_key_frame();
last_appended_buffer_decode_timestamp_ =
buffers.back()->GetDecodeTimestamp();
// Since we didn't buffer anything, don't update
// |highest_timestamp_in_append_sequence_|.
DVLOG(1) << __func__ << " " << GetStreamTypeName()
<< ": new buffers in the middle of coded frame group depend on"
" keyframe that has been removed, and contain no keyframes."
" Skipping further processing.";
DVLOG(1) << __func__ << " " << GetStreamTypeName()
<< ": done. ranges_=" << RangesToString(ranges_);
return;
} else if (itr != buffers.begin()) {
// Copy the first key frame and everything after it into
// |trimmed_buffers|.
trimmed_buffers.assign(itr, buffers.end());
buffers_for_new_range = &trimmed_buffers;
}
new_range_start_time = buffers_for_new_range->front()->timestamp();
}
range_for_next_append_ = AddToRanges(std::make_unique<SourceBufferRange>(
TypeToGapPolicy(GetType()), *buffers_for_new_range,
new_range_start_time,
base::BindRepeating(&SourceBufferStream::GetMaxInterbufferDistance,
base::Unretained(this))));
last_appended_buffer_timestamp_ =
buffers_for_new_range->back()->timestamp();
last_appended_buffer_duration_ = buffers_for_new_range->back()->duration();
last_appended_buffer_is_keyframe_ =
buffers_for_new_range->back()->is_key_frame();
last_appended_buffer_decode_timestamp_ =
buffers_for_new_range->back()->GetDecodeTimestamp();
highest_timestamp_in_append_sequence_ =
(*range_for_next_append_)->GetEndTimestamp();
highest_buffered_end_time_in_append_sequence_ =
(*range_for_next_append_)->GetBufferedEndTimestamp();
}
new_coded_frame_group_ = false;
MergeWithNextRangeIfNecessary(range_for_next_append_);
// Some SAP-Type-2 append sequences require that we coalesce
// |range_for_next_append_| with the range that is *before* it.
if (range_for_next_append_ != ranges_.begin()) {
auto prior_range = range_for_next_append_;
prior_range--;
MergeWithNextRangeIfNecessary(prior_range);
}
// Seek to try to fulfill a previous call to Seek().
if (seek_pending_) {
DCHECK(!selected_range_);
DCHECK(deleted_buffers.empty());
Seek(seek_buffer_timestamp_);
}
if (!deleted_buffers.empty()) {
track_buffer_.insert(track_buffer_.end(), deleted_buffers.begin(),
deleted_buffers.end());
DVLOG(3) << __func__ << " " << GetStreamTypeName() << " Added "
<< deleted_buffers.size()
<< " buffers to track buffer. TB size is now "
<< track_buffer_.size();
} else {
DVLOG(3) << __func__ << " " << GetStreamTypeName()
<< " No deleted buffers for track buffer";
}
// Prune any extra buffers in |track_buffer_| if new keyframes
// are appended to the range covered by |track_buffer_|.
if (!track_buffer_.empty()) {
base::TimeDelta keyframe_timestamp =
FindKeyframeAfterTimestamp(track_buffer_.front()->timestamp());
if (keyframe_timestamp != kNoTimestamp)
PruneTrackBuffer(keyframe_timestamp);
}
SetSelectedRangeIfNeeded(next_buffer_timestamp);
DVLOG(1) << __func__ << " " << GetStreamTypeName()
<< ": done. ranges_=" << RangesToString(ranges_);
DCHECK(IsRangeListSorted(ranges_));
DCHECK(OnlySelectedRangeIsSeeked());
}
void SourceBufferStream::Remove(base::TimeDelta start,
base::TimeDelta end,
base::TimeDelta duration) {
DVLOG(1) << __func__ << " " << GetStreamTypeName() << " ("
<< start.InMicroseconds() << "us, " << end.InMicroseconds() << "us, "
<< duration.InMicroseconds() << "us)";
DCHECK(start >= base::TimeDelta()) << start.InMicroseconds() << "us";
DCHECK(start < end) << "start " << start.InMicroseconds() << "us, end "
<< end.InMicroseconds() << "us";
DCHECK(duration != kNoTimestamp);
base::TimeDelta remove_end_timestamp = duration;
base::TimeDelta keyframe_timestamp = FindKeyframeAfterTimestamp(end);
if (keyframe_timestamp != kNoTimestamp) {
remove_end_timestamp = keyframe_timestamp;
} else if (end < remove_end_timestamp) {
remove_end_timestamp = end;
}
BufferQueue deleted_buffers;
RemoveInternal(start, remove_end_timestamp, false, &deleted_buffers);
if (!deleted_buffers.empty()) {
// Buffers for the current position have been removed.
SetSelectedRangeIfNeeded(deleted_buffers.front()->timestamp());
if (highest_output_buffer_timestamp_ == kNoTimestamp) {
// We just removed buffers for the current playback position for this
// stream, yet we also had output no buffer since the last Seek.
// Re-seek to prevent stall.
DVLOG(1) << __func__ << " " << GetStreamTypeName() << ": re-seeking to "
<< seek_buffer_timestamp_
<< " to prevent stall if this time becomes buffered again";
Seek(seek_buffer_timestamp_);
}
}
DCHECK(OnlySelectedRangeIsSeeked());
DCHECK(IsRangeListSorted(ranges_));
}
base::TimeDelta SourceBufferStream::PotentialNextAppendTimestamp() const {
// The next potential append will either be in a GOP adjacent to
// |highest_timestamp_in_append_sequence_| (if known), or if unknown and we
// are still at the beginning of a new coded frame group, then will be into
// the range (if any) to which |coded_frame_group_start_pts_| belongs.
if (highest_timestamp_in_append_sequence_ != kNoTimestamp)
return highest_timestamp_in_append_sequence_;
if (new_coded_frame_group_)
return coded_frame_group_start_pts_;
// If we still don't know a potential next append timestamp, then we have
// removed the range to which it previously belonged and have not completed a
// subsequent append or received a subsequent OnStartOfCodedFrameGroup()
// signal.
return kNoTimestamp;
}
void SourceBufferStream::UpdateLastAppendStateForRemove(
base::TimeDelta remove_start,
base::TimeDelta remove_end,
bool exclude_start) {
// TODO(chcunningham): change exclude_start to include_start in this class and
// SourceBufferRange. Negatives are hard to reason about.
bool include_start = !exclude_start;
// No need to check previous append's GOP if starting a new CFG. New CFG is
// already required to begin with a key frame.
if (new_coded_frame_group_)
return;
if (range_for_next_append_ != ranges_.end()) {
if (last_appended_buffer_timestamp_ != kNoTimestamp) {
// Note start and end of last appended GOP.
base::TimeDelta gop_end = highest_timestamp_in_append_sequence_;
base::TimeDelta gop_start =
(*range_for_next_append_)->KeyframeBeforeTimestamp(gop_end);
// If last append is about to be disrupted, reset associated state so we
// know to create a new range for future appends and require an initial
// key frame.
if (((include_start && remove_start == gop_end) ||
remove_start < gop_end) &&
remove_end > gop_start) {
DVLOG(2) << __func__ << " " << GetStreamTypeName()
<< " Resetting next append state for remove ("
<< remove_start.InMicroseconds() << "us, "
<< remove_end.InMicroseconds() << "us, " << exclude_start
<< ")";
range_for_next_append_ = ranges_.end();
ResetLastAppendedState();
}
} else {
NOTREACHED() << __func__ << " " << GetStreamTypeName()
<< " range_for_next_append_ set, but not tracking last"
<< " append nor new coded frame group.";
}
}
}
void SourceBufferStream::RemoveInternal(base::TimeDelta start,
base::TimeDelta end,
bool exclude_start,
BufferQueue* deleted_buffers) {
DVLOG(2) << __func__ << " " << GetStreamTypeName() << " ("
<< start.InMicroseconds() << "us, " << end.InMicroseconds() << "us, "
<< exclude_start << ")";
DVLOG(3) << __func__ << " " << GetStreamTypeName()
<< ": before remove ranges_=" << RangesToString(ranges_);
DCHECK(start >= base::TimeDelta());
DCHECK(start < end) << "start " << start.InMicroseconds() << "us, end "
<< end.InMicroseconds() << "us";
DCHECK(deleted_buffers);
// Doing this up-front simplifies decisions about |range_for_next_append_|
// below.
UpdateLastAppendStateForRemove(start, end, exclude_start);
auto itr = ranges_.begin();
while (itr != ranges_.end()) {
SourceBufferRange* range = itr->get();
if (range->GetStartTimestamp() >= end)
break;
// Split off any remaining GOPs starting at or after |end| and add it to
// |ranges_|.
std::unique_ptr<SourceBufferRange> new_range = range->SplitRange(end);
if (new_range) {
itr = ranges_.insert(++itr, std::move(new_range));
// Update |range_for_next_append_| if it was previously |range| and should
// be the new range (that |itr| is at) now.
if (range_for_next_append_ != ranges_.end() &&
range_for_next_append_->get() == range) {
base::TimeDelta potential_next_append_timestamp =
PotentialNextAppendTimestamp();
if (potential_next_append_timestamp != kNoTimestamp &&
(*itr)->BelongsToRange(potential_next_append_timestamp)) {
range_for_next_append_ = itr;
}
}
// Update the selected range if the next buffer position was transferred
// to the newly inserted range (that |itr| is at now).
if ((*itr)->HasNextBufferPosition())
SetSelectedRange(itr->get());
--itr;
}
// Truncate the current range so that it only contains data before
// the removal range.
BufferQueue saved_buffers;
bool delete_range = range->TruncateAt(start, &saved_buffers, exclude_start);
// Check to see if the current playback position was removed and update the
// selected range appropriately.
if (!saved_buffers.empty()) {
DCHECK(!range->HasNextBufferPosition());
DCHECK(deleted_buffers->empty());
*deleted_buffers = saved_buffers;
}
if (range == selected_range_ && !range->HasNextBufferPosition())
SetSelectedRange(NULL);
// If the current range now is completely covered by the removal
// range then delete it and move on.
if (delete_range) {
DeleteAndRemoveRange(&itr);
continue;
}
// Clear |range_for_next_append_| if we determine that the removal
// operation makes it impossible for the next append to be added
// to the current range.
if (range_for_next_append_ != ranges_.end() &&
range_for_next_append_->get() == range) {
base::TimeDelta potential_next_append_timestamp =
PotentialNextAppendTimestamp();
if (!range->BelongsToRange(potential_next_append_timestamp)) {
DVLOG(1) << "Resetting range_for_next_append_ since the next append"
<< " can't add to the current range.";
range_for_next_append_ =
FindExistingRangeFor(potential_next_append_timestamp);
}
}
// Move on to the next range.
++itr;
}
DVLOG(3) << __func__ << " " << GetStreamTypeName()
<< ": after remove ranges_=" << RangesToString(ranges_);
DCHECK(OnlySelectedRangeIsSeeked());
}
void SourceBufferStream::ResetSeekState() {
SetSelectedRange(NULL);
track_buffer_.clear();
config_change_pending_ = false;
highest_output_buffer_timestamp_ = kNoTimestamp;
just_exhausted_track_buffer_ = false;
pending_buffer_.reset();
pending_buffers_complete_ = false;
}
void SourceBufferStream::ResetLastAppendedState() {
last_appended_buffer_timestamp_ = kNoTimestamp;
last_appended_buffer_duration_ = kNoTimestamp;
last_appended_buffer_is_keyframe_ = false;
last_appended_buffer_decode_timestamp_ = kNoDecodeTimestamp();
highest_timestamp_in_append_sequence_ = kNoTimestamp;
highest_buffered_end_time_in_append_sequence_ = kNoTimestamp;
}
bool SourceBufferStream::ShouldSeekToStartOfBuffered(
base::TimeDelta seek_timestamp) const {
if (ranges_.empty())
return false;
base::TimeDelta beginning_of_buffered = ranges_.front()->GetStartTimestamp();
return (seek_timestamp <= beginning_of_buffered &&
beginning_of_buffered < kSeekToStartFudgeRoom());
}
bool SourceBufferStream::IsDtsMonotonicallyIncreasing(
const BufferQueue& buffers) {
DCHECK(!buffers.empty());
DecodeTimestamp prev_dts = last_appended_buffer_decode_timestamp_;
bool prev_is_keyframe = last_appended_buffer_is_keyframe_;
for (BufferQueue::const_iterator itr = buffers.begin();
itr != buffers.end(); ++itr) {
DecodeTimestamp current_dts = (*itr)->GetDecodeTimestamp();
bool current_is_keyframe = (*itr)->is_key_frame();
DCHECK(current_dts != kNoDecodeTimestamp());
DCHECK((*itr)->duration() >= base::TimeDelta())
<< "Packet with invalid duration."
<< " pts " << (*itr)->timestamp().InMicroseconds() << "us dts "
<< (*itr)->GetDecodeTimestamp().InMicroseconds() << "us dur "
<< (*itr)->duration().InMicroseconds() << "us";
// FrameProcessor should have enforced that all audio frames are keyframes
// already.
DCHECK(current_is_keyframe || GetType() != SourceBufferStreamType::kAudio);
// Only verify DTS monotonicity within the current GOP.
if (current_is_keyframe) {
// Reset prev_dts tracking since a new GOP is starting.
prev_dts = kNoDecodeTimestamp();
}
if (prev_dts != kNoDecodeTimestamp()) {
if (current_dts < prev_dts) {
MEDIA_LOG(ERROR, media_log_)
<< "Buffers did not monotonically increase.";
return false;
}
}
prev_dts = current_dts;
prev_is_keyframe = current_is_keyframe;
}
return true;
}
bool SourceBufferStream::OnlySelectedRangeIsSeeked() const {
for (auto itr = ranges_.begin(); itr != ranges_.end(); ++itr) {
if ((*itr)->HasNextBufferPosition() && itr->get() != selected_range_)
return false;
}
return !selected_range_ || selected_range_->HasNextBufferPosition();
}
bool SourceBufferStream::UpdateMaxInterbufferDtsDistance(
const BufferQueue& buffers) {
DCHECK(!buffers.empty());
base::TimeDelta old_distance = max_interbuffer_distance_;
DecodeTimestamp prev_dts = last_appended_buffer_decode_timestamp_;
for (BufferQueue::const_iterator itr = buffers.begin();
itr != buffers.end(); ++itr) {
DecodeTimestamp current_dts = (*itr)->GetDecodeTimestamp();
DCHECK(current_dts != kNoDecodeTimestamp());
base::TimeDelta interbuffer_distance = (*itr)->duration();
DCHECK(interbuffer_distance >= base::TimeDelta());
if (prev_dts != kNoDecodeTimestamp()) {
interbuffer_distance =
std::max(current_dts - prev_dts, interbuffer_distance);
}
DCHECK(max_interbuffer_distance_ >=
base::TimeDelta::FromMilliseconds(kMinimumInterbufferDistanceInMs));
max_interbuffer_distance_ =
std::max(max_interbuffer_distance_, interbuffer_distance);
prev_dts = current_dts;
}
bool changed_max = max_interbuffer_distance_ != old_distance;
DVLOG_IF(2, changed_max) << __func__ << " " << GetStreamTypeName()
<< " Changed max interbuffer DTS distance from "
<< old_distance.InMicroseconds() << "us to "
<< max_interbuffer_distance_.InMicroseconds()
<< "us";
return changed_max;
}
void SourceBufferStream::SetConfigIds(const BufferQueue& buffers) {
for (BufferQueue::const_iterator itr = buffers.begin();
itr != buffers.end(); ++itr) {
(*itr)->SetConfigId(append_config_index_);
}
}
void SourceBufferStream::OnMemoryPressure(
base::TimeDelta media_time,
base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level,
bool force_instant_gc) {
DVLOG(4) << __func__ << " level=" << memory_pressure_level;
memory_pressure_level_ = memory_pressure_level;
if (force_instant_gc)
GarbageCollectIfNeeded(media_time, 0);
}
bool SourceBufferStream::GarbageCollectIfNeeded(base::TimeDelta media_time,
size_t newDataSize) {
DCHECK(media_time != kNoTimestamp);
// Garbage collection should only happen before/during appending new data,
// which should not happen in end-of-stream state. Unless we also allow GC to
// happen on memory pressure notifications, which might happen even in EOS
// state.
if (!base::FeatureList::IsEnabled(kMemoryPressureBasedSourceBufferGC))
DCHECK(!end_of_stream_);
// Compute size of |ranges_|.
size_t ranges_size = GetBufferedSize();
// Sanity and overflow checks
if ((newDataSize > memory_limit_) ||
(ranges_size + newDataSize < ranges_size)) {
LIMITED_MEDIA_LOG(DEBUG, media_log_, num_garbage_collect_algorithm_logs_,
kMaxGarbageCollectAlgorithmWarningLogs)
<< GetStreamTypeName() << " stream: "
<< "new append of newDataSize=" << newDataSize
<< " bytes exceeds memory_limit_=" << memory_limit_
<< ", currently buffered ranges_size=" << ranges_size;
return false;
}
size_t effective_memory_limit = memory_limit_;
if (base::FeatureList::IsEnabled(kMemoryPressureBasedSourceBufferGC)) {
switch (memory_pressure_level_) {
case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE:
effective_memory_limit = memory_limit_ / 2;
break;
case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL:
effective_memory_limit = 0;
break;
case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE:
break;
}
}
// Return if we're under or at the memory limit.
if (ranges_size + newDataSize <= effective_memory_limit)
return true;
size_t bytes_over_hard_memory_limit = 0;
if (ranges_size + newDataSize > memory_limit_)
bytes_over_hard_memory_limit = ranges_size + newDataSize - memory_limit_;
size_t bytes_to_free = ranges_size + newDataSize - effective_memory_limit;
DVLOG(2) << __func__ << " " << GetStreamTypeName()
<< ": Before GC media_time=" << media_time.InMicroseconds()
<< "us ranges_=" << RangesToString(ranges_)
<< " seek_pending_=" << seek_pending_
<< " ranges_size=" << ranges_size << " newDataSize=" << newDataSize
<< " memory_limit_=" << memory_limit_
<< " effective_memory_limit=" << effective_memory_limit
<< " last_appended_buffer_timestamp_="
<< last_appended_buffer_timestamp_.InMicroseconds()
<< "us highest_timestamp_in_append_sequence_="
<< highest_timestamp_in_append_sequence_.InMicroseconds()
<< "us highest_buffered_end_time_in_append_sequence_="
<< highest_buffered_end_time_in_append_sequence_.InMicroseconds()
<< "us";
if (selected_range_ && !seek_pending_ &&
media_time > selected_range_->GetBufferedEndTimestamp()) {
// Strictly speaking |media_time| (taken from HTMLMediaElement::currentTime)
// should always be in the buffered ranges, but media::Pipeline uses audio
// stream as the main time source, when audio is present.
// In cases when audio and video streams have different buffered ranges, the
// |media_time| value might be slightly outside of the video stream buffered
// range. In those cases we need to clamp |media_time| value to the current
// stream buffered ranges, to ensure the MSE garbage collection algorithm
// works correctly (see crbug.com/563292 for details).
base::TimeDelta selected_buffered_end =
selected_range_->GetBufferedEndTimestamp();
DVLOG(2) << __func__ << " media_time " << media_time.InMicroseconds()
<< "us is outside of selected_range_=["
<< selected_range_->GetStartTimestamp().InMicroseconds() << "us;"
<< selected_buffered_end.InMicroseconds()
<< "us] clamping media_time to be "
<< selected_buffered_end.InMicroseconds() << "us";
media_time = selected_buffered_end;
}
size_t bytes_freed = 0;
// If last appended buffer position was earlier than the current playback time
// then try deleting data between last append and current media_time.
if (last_appended_buffer_timestamp_ != kNoTimestamp &&
last_appended_buffer_duration_ != kNoTimestamp &&
highest_buffered_end_time_in_append_sequence_ != kNoTimestamp &&
media_time > highest_buffered_end_time_in_append_sequence_) {
size_t between = FreeBuffersAfterLastAppended(bytes_to_free, media_time);
DVLOG(3) << __func__ << " FreeBuffersAfterLastAppended "
<< " released " << between << " bytes"
<< " ranges_=" << RangesToString(ranges_);
bytes_freed += between;
// Some players start appending data at the new seek target position before
// actually initiating the seek operation (i.e. they try to improve seek
// performance by prebuffering some data at the seek target position and
// initiating seek once enough data is pre-buffered. In those cases we'll
// see that data is being appended at some new position, but there is no
// pending seek reported yet. In this situation we need to try preserving
// the most recently appended data, i.e. data belonging to the same buffered
// range as the most recent append.
if (range_for_next_append_ != ranges_.end()) {
DCHECK((*range_for_next_append_)->GetStartTimestamp() <= media_time);
media_time = (*range_for_next_append_)->GetStartTimestamp();
DVLOG(3) << __func__ << " media_time adjusted to "
<< media_time.InMicroseconds() << "us";
}
}
// If there is an unsatisfied pending seek, we can safely remove all data that
// is earlier than seek target, then remove from the back until we reach the
// most recently appended GOP and then remove from the front if we still don't
// have enough space for the upcoming append.
if (bytes_freed < bytes_to_free && seek_pending_) {
DCHECK(!ranges_.empty());
// All data earlier than the seek target |media_time| can be removed safely
size_t front = FreeBuffers(bytes_to_free - bytes_freed, media_time, false);
DVLOG(3) << __func__ << " Removed " << front
<< " bytes from the front. ranges_=" << RangesToString(ranges_);
bytes_freed += front;
// If removing data earlier than |media_time| didn't free up enough space,
// then try deleting from the back until we reach most recently appended GOP
if (bytes_freed < bytes_to_free) {
size_t back = FreeBuffers(bytes_to_free - bytes_freed, media_time, true);
DVLOG(3) << __func__ << " Removed " << back
<< " bytes from the back. ranges_=" << RangesToString(ranges_);
bytes_freed += back;
}
// If even that wasn't enough, then try greedily deleting from the front,
// that should allow us to remove as much data as necessary to succeed.
if (bytes_freed < bytes_to_free) {
size_t front2 = FreeBuffers(bytes_to_free - bytes_freed,
ranges_.back()->GetEndTimestamp(), false);
DVLOG(3) << __func__ << " Removed " << front2
<< " bytes from the front. ranges_=" << RangesToString(ranges_);
bytes_freed += front2;
}
DCHECK(bytes_freed >= bytes_to_free);
}
// Try removing data from the front of the SourceBuffer up to |media_time|
// position.
if (bytes_freed < bytes_to_free) {
size_t front = FreeBuffers(bytes_to_free - bytes_freed, media_time, false);
DVLOG(3) << __func__ << " Removed " << front
<< " bytes from the front. ranges_=" << RangesToString(ranges_);
bytes_freed += front;
}
// Try removing data from the back of the SourceBuffer, until we reach the
// most recent append position.
if (bytes_freed < bytes_to_free) {
size_t back = FreeBuffers(bytes_to_free - bytes_freed, media_time, true);
DVLOG(3) << __func__ << " Removed " << back
<< " bytes from the back. ranges_=" << RangesToString(ranges_);
bytes_freed += back;
}
DVLOG(2) << __func__ << " " << GetStreamTypeName()
<< ": After GC bytes_to_free=" << bytes_to_free
<< " bytes_freed=" << bytes_freed
<< " bytes_over_hard_memory_limit=" << bytes_over_hard_memory_limit
<< " ranges_=" << RangesToString(ranges_);
return bytes_freed >= bytes_over_hard_memory_limit;
}
size_t SourceBufferStream::FreeBuffersAfterLastAppended(
size_t total_bytes_to_free,
base::TimeDelta media_time) {
DVLOG(4) << __func__ << " highest_buffered_end_time_in_append_sequence_="
<< highest_buffered_end_time_in_append_sequence_.InMicroseconds()
<< "us media_time=" << media_time.InMicroseconds() << "us";
base::TimeDelta remove_range_start =
highest_buffered_end_time_in_append_sequence_;
if (last_appended_buffer_is_keyframe_)
remove_range_start += GetMaxInterbufferDistance();
base::TimeDelta remove_range_start_keyframe =
FindKeyframeAfterTimestamp(remove_range_start);
if (remove_range_start_keyframe != kNoTimestamp)
remove_range_start = remove_range_start_keyframe;
if (remove_range_start >= media_time)
return 0;
base::TimeDelta remove_range_end;
size_t bytes_freed = GetRemovalRange(remove_range_start,
media_time,
total_bytes_to_free,
&remove_range_end);
if (bytes_freed > 0) {
DVLOG(4) << __func__ << " removing [" << remove_range_start.InMicroseconds()
<< "us;" << remove_range_end.InMicroseconds() << "us]";
Remove(remove_range_start, remove_range_end, media_time);
}
return bytes_freed;
}
size_t SourceBufferStream::GetRemovalRange(
base::TimeDelta start_timestamp,
base::TimeDelta end_timestamp,
size_t total_bytes_to_free,
base::TimeDelta* removal_end_timestamp) {
DCHECK(start_timestamp >= base::TimeDelta())
<< start_timestamp.InMicroseconds() << "us";
DCHECK(start_timestamp < end_timestamp)
<< "start " << start_timestamp.InMicroseconds() << "us, end "
<< end_timestamp.InMicroseconds() << "us";
size_t bytes_freed = 0;
for (auto itr = ranges_.begin();
itr != ranges_.end() && bytes_freed < total_bytes_to_free; ++itr) {
SourceBufferRange* range = itr->get();
if (range->GetStartTimestamp() >= end_timestamp)
break;
if (range->GetEndTimestamp() < start_timestamp)
continue;
size_t bytes_to_free = total_bytes_to_free - bytes_freed;
size_t bytes_removed = range->GetRemovalGOP(
start_timestamp, end_timestamp, bytes_to_free, removal_end_timestamp);
bytes_freed += bytes_removed;
}
return bytes_freed;
}
size_t SourceBufferStream::FreeBuffers(size_t total_bytes_to_free,
base::TimeDelta media_time,
bool reverse_direction) {
TRACE_EVENT2("media", "SourceBufferStream::FreeBuffers",
"total bytes to free", total_bytes_to_free,
"reverse direction", reverse_direction);
DCHECK_GT(total_bytes_to_free, 0u);
size_t bytes_freed = 0;
// This range will save the last GOP appended to |range_for_next_append_|
// if the buffers surrounding it get deleted during garbage collection.
std::unique_ptr<SourceBufferRange> new_range_for_append;
while (!ranges_.empty() && bytes_freed < total_bytes_to_free) {
SourceBufferRange* current_range = NULL;
BufferQueue buffers;
size_t bytes_deleted = 0;
if (reverse_direction) {
current_range = ranges_.back().get();
DVLOG(5) << "current_range=" << RangeToString(*current_range);
if (current_range->LastGOPContainsNextBufferPosition()) {
DCHECK_EQ(current_range, selected_range_);
DVLOG(5) << "current_range contains next read position, stopping GC";
break;
}
DVLOG(5) << "Deleting GOP from back: " << RangeToString(*current_range);
bytes_deleted = current_range->DeleteGOPFromBack(&buffers);
} else {
current_range = ranges_.front().get();
DVLOG(5) << "current_range=" << RangeToString(*current_range);
// FirstGOPEarlierThanMediaTime() is useful here especially if
// |seek_pending_| (such that no range contains next buffer
// position).
// FirstGOPContainsNextBufferPosition() is useful here especially if
// |!seek_pending_| to protect against DeleteGOPFromFront() if
// FirstGOPEarlierThanMediaTime() was insufficient alone.
if (!current_range->FirstGOPEarlierThanMediaTime(media_time) ||
current_range->FirstGOPContainsNextBufferPosition()) {
// We have removed all data up to the GOP that contains current playback
// position, we can't delete any further.
DVLOG(5) << "current_range contains playback position, stopping GC";
break;
}
DVLOG(4) << "Deleting GOP from front: " << RangeToString(*current_range)
<< ", media_time: " << media_time.InMicroseconds()
<< ", current_range->HasNextBufferPosition(): "
<< current_range->HasNextBufferPosition();
bytes_deleted = current_range->DeleteGOPFromFront(&buffers);
}
// Check to see if we've just deleted the GOP that was last appended.
base::TimeDelta end_timestamp = buffers.back()->timestamp();
if (end_timestamp == last_appended_buffer_timestamp_) {
DCHECK(last_appended_buffer_timestamp_ != kNoTimestamp);
DCHECK(!new_range_for_append);
// Create a new range containing these buffers.
new_range_for_append = std::make_unique<SourceBufferRange>(
TypeToGapPolicy(GetType()), buffers, kNoTimestamp,
base::BindRepeating(&SourceBufferStream::GetMaxInterbufferDistance,
base::Unretained(this)));
range_for_next_append_ = ranges_.end();
} else {
bytes_freed += bytes_deleted;
}
if (current_range->size_in_bytes() == 0) {
DCHECK_NE(current_range, selected_range_);
DCHECK(range_for_next_append_ == ranges_.end() ||
range_for_next_append_->get() != current_range);
// Delete |current_range| by popping it out of |ranges_|.
reverse_direction ? ranges_.pop_back() : ranges_.pop_front();
}
if (reverse_direction && new_range_for_append) {
// We don't want to delete any further, or we'll be creating gaps
break;
}
}
// Insert |new_range_for_append| into |ranges_|, if applicable.
if (new_range_for_append) {
range_for_next_append_ = AddToRanges(std::move(new_range_for_append));
DCHECK(range_for_next_append_ != ranges_.end());
// Check to see if we need to merge the just added range that was in
// |new_range_for_append| with the range before or after it. That added
// range is created whenever the last GOP appended is encountered,
// regardless of whether any buffers after it are ultimately deleted.
// Merging is necessary if there were no buffers (or very few buffers)
// deleted after creating that added range.
if (range_for_next_append_ != ranges_.begin()) {
auto range_before_next = range_for_next_append_;
--range_before_next;
MergeWithNextRangeIfNecessary(range_before_next);
}
MergeWithNextRangeIfNecessary(range_for_next_append_);
}
return bytes_freed;
}
void SourceBufferStream::TrimSpliceOverlap(const BufferQueue& new_buffers) {
DCHECK(!new_buffers.empty());
DCHECK_EQ(SourceBufferStreamType::kAudio, GetType());
// Find the overlapped range (if any).
const base::TimeDelta splice_timestamp = new_buffers.front()->timestamp();
auto range_itr = FindExistingRangeFor(splice_timestamp);
if (range_itr == ranges_.end()) {
DVLOG(3) << __func__ << " No splice trimming. No range overlap at time "
<< splice_timestamp.InMicroseconds();
return;
}
// Search for overlapped buffer needs exclusive end value. Choosing smallest
// possible value.
const base::TimeDelta end_pts =
splice_timestamp + base::TimeDelta::FromMicroseconds(1);
// Find if new buffer's start would overlap an existing buffer.
BufferQueue overlapped_buffers;
if (!(*range_itr)
->GetBuffersInRange(splice_timestamp, end_pts,
&overlapped_buffers)) {
// Bail if no overlapped buffers found.
DVLOG(3) << __func__ << " No splice trimming. No buffer overlap at time "
<< splice_timestamp.InMicroseconds();
return;
}
// At most one buffer should exist containing the time of the newly appended
// buffer's start. It may happen that bad content appends buffers with
// durations that cause nonsensical overlap. Trimming should not be performed
// in these cases, as the content is already in a bad state.
if (overlapped_buffers.size() != 1U) {
DVLOG(3) << __func__
<< " No splice trimming. Found more than one overlapped buffer"
" (bad content) at time "
<< splice_timestamp.InMicroseconds();
MEDIA_LOG(WARNING, media_log_)
<< "Media is badly muxed. Detected " << overlapped_buffers.size()
<< " overlapping audio buffers at time "
<< splice_timestamp.InMicroseconds();
return;
}
StreamParserBuffer* overlapped_buffer = overlapped_buffers.front().get();
if (overlapped_buffer->timestamp() == splice_timestamp) {
// Ignore buffers with the same start time. They will be completely removed
// in PrepareRangesForNextAppend().
DVLOG(3) << __func__ << " No splice trimming at time "
<< splice_timestamp.InMicroseconds()
<< ". Overlapped buffer will be completely removed.";
return;
}
// Trimming a buffer with estimated duration is too risky. Estimates are rough
// and what appears to be overlap may really just be a bad estimate. Imprecise
// trimming may lead to loss of AV sync.
if (overlapped_buffer->is_duration_estimated()) {
DVLOG(3) << __func__ << " Skipping audio splice trimming at PTS="
<< splice_timestamp.InMicroseconds() << ". Overlapped buffer has "
<< "estimated duration.";
return;
}
// Determine the duration of overlap.
base::TimeDelta overlapped_end_time =
overlapped_buffer->timestamp() + overlapped_buffer->duration();
base::TimeDelta overlap_duration = overlapped_end_time - splice_timestamp;
// At this point overlap should be non-empty (ruled out same-timestamp above).
DCHECK_GT(overlap_duration, base::TimeDelta());
// Don't trim for overlaps of less than one millisecond (which is frequently
// the extent of timestamp resolution for poorly encoded media).
if (overlap_duration < base::TimeDelta::FromMilliseconds(1)) {
std::stringstream log_string;
log_string << "Skipping audio splice trimming at PTS="
<< splice_timestamp.InMicroseconds() << "us. Found only "
<< overlap_duration.InMicroseconds()
<< "us of overlap, need at least 1000us. Multiple occurrences "
<< "may result in loss of A/V sync.";
LIMITED_MEDIA_LOG(DEBUG, media_log_, num_splice_logs_, kMaxAudioSpliceLogs)
<< log_string.str();
DVLOG(1) << __func__ << log_string.str();
return;
}
// Trim overlap from the existing buffer.
DecoderBuffer::DiscardPadding discard_padding =
overlapped_buffer->discard_padding();
discard_padding.second += overlap_duration;
overlapped_buffer->set_discard_padding(discard_padding);
overlapped_buffer->set_duration(overlapped_buffer->duration() -
overlap_duration);
// Note that the range's end time tracking shouldn't need explicit updating
// here due to the overlapped buffer's truncation because the range tracks
// that end time using a pointer to the buffer (which should be
// |overlapped_buffer| if the overlap occurred at the end of the range).
// Every audio frame is a keyframe, so there is no out-of-order PTS vs DTS
// sequencing to overcome. If the overlap occurs in the middle of the range,
// the caller invokes methods on the range which internally update the end
// time(s) of the resulting range(s) involved in the append.
std::stringstream log_string;
log_string << "Audio buffer splice at PTS="
<< splice_timestamp.InMicroseconds()
<< "us. Trimmed tail of overlapped buffer (PTS="
<< overlapped_buffer->timestamp().InMicroseconds() << "us) by "
<< overlap_duration.InMicroseconds() << "us.";
LIMITED_MEDIA_LOG(DEBUG, media_log_, num_splice_logs_, kMaxAudioSpliceLogs)
<< log_string.str();
DVLOG(1) << __func__ << log_string.str();
}
void SourceBufferStream::PrepareRangesForNextAppend(
const BufferQueue& new_buffers,
BufferQueue* deleted_buffers) {
DCHECK(deleted_buffers);
if (GetType() == SourceBufferStreamType::kAudio)
TrimSpliceOverlap(new_buffers);
base::TimeDelta buffers_start_timestamp = kNoTimestamp;
base::TimeDelta buffers_end_timestamp = kNoTimestamp;
GetTimestampInterval(new_buffers, &buffers_start_timestamp,
&buffers_end_timestamp);
DCHECK(buffers_start_timestamp != kNoTimestamp);
DCHECK(buffers_end_timestamp != kNoTimestamp);
// 1. Clean up the old buffers between the last appended buffers and the
// beginning of |new_buffers|.
if (highest_timestamp_in_append_sequence_ != kNoTimestamp &&
highest_timestamp_in_append_sequence_ < buffers_start_timestamp) {
RemoveInternal(highest_timestamp_in_append_sequence_,
buffers_start_timestamp, true, deleted_buffers);
}
// 2. Delete the buffers that |new_buffers| overlaps.
// There may be buffers in |new_buffers| with timestamp before
// |highest_timestamp_in_append_sequence_| that shouldn't trigger removal of
// stuff before |highest_timestamp_in_append_sequence_|.
if (highest_timestamp_in_append_sequence_ != kNoTimestamp &&
buffers_start_timestamp < highest_timestamp_in_append_sequence_) {
DCHECK(highest_timestamp_in_append_sequence_ <=
highest_buffered_end_time_in_append_sequence_);
buffers_start_timestamp = highest_buffered_end_time_in_append_sequence_;
}
if (new_coded_frame_group_) {
// Extend the deletion range earlier to the coded frame group start time if
// this is the first append in a new coded frame group.
DCHECK(coded_frame_group_start_pts_ != kNoTimestamp);
buffers_start_timestamp =
std::min(coded_frame_group_start_pts_, buffers_start_timestamp);
}
// Return early if no further overlap removal is needed. First check if
// |buffers_start_timestamp| is in the middle of the range; we could be
// overlap-appending the middle of a previous coded frame sequence's range
// with non-keyframes prior to |highest_timestamp_in_append_sequence_|, so we
// need to split that range appropriately here and then return early. If we
// don't return early here, overlap removal (including any necessary range
// splitting) will occur.
if (buffers_start_timestamp >= buffers_end_timestamp) {
DCHECK(highest_timestamp_in_append_sequence_ != kNoTimestamp);
DCHECK(range_for_next_append_ != ranges_.end());
DCHECK((*range_for_next_append_)->BelongsToRange(buffers_start_timestamp));
// Split the range at |buffers_start_timestamp|, if necessary, then return
// early.
std::unique_ptr<SourceBufferRange> new_range =
(*range_for_next_append_)->SplitRange(buffers_start_timestamp);
if (!new_range)
return;
range_for_next_append_ =
ranges_.insert(++range_for_next_append_, std::move(new_range));
// Update the selected range if the next buffer position was transferred
// to the newly inserted range.
if ((*range_for_next_append_)->HasNextBufferPosition())
SetSelectedRange(range_for_next_append_->get());
--range_for_next_append_;
return;
}
// Exclude the start from removal to avoid deleting the highest appended
// buffer in cases where the first buffer in |new_buffers| has same timestamp
// as the highest appended buffer (even in out-of-order DTS vs PTS sequence).
// Only do this when :
// A. Type is video. This may occur in cases of VP9 alt-ref frames or frames
// with incorrect timestamps. Removing a frame may break decode
// dependencies and there are no downsides to just keeping it (other than
// some throw-away decoder work).
// B. Type is text. TODO(chcunningham): Implement text splicing. See
// http://crbug.com/661408
// C. Type is audio and overlapped duration is 0. We've encountered Vorbis
// streams containing zero-duration buffers (i.e. no real overlap). For
// non-zero duration removing overlapped frames is important to preserve
// A/V sync (see AudioClock).
const bool exclude_start =
highest_timestamp_in_append_sequence_ ==
new_buffers.front()->timestamp() &&
(GetType() == SourceBufferStreamType::kVideo ||
GetType() == SourceBufferStreamType::kText ||
last_appended_buffer_duration_ == base::TimeDelta());
// Finally do the deletion of overlap.
RemoveInternal(buffers_start_timestamp, buffers_end_timestamp, exclude_start,
deleted_buffers);
}
// static
void SourceBufferStream::GetTimestampInterval(const BufferQueue& buffers,
base::TimeDelta* start,
base::TimeDelta* end) {
base::TimeDelta start_pts = buffers.front()->timestamp();
base::TimeDelta end_pts = start_pts;
for (const auto& buffer : buffers) {
base::TimeDelta timestamp = buffer->timestamp();
start_pts = std::min(timestamp, start_pts);
base::TimeDelta duration = buffer->duration();
// FrameProcessor should protect against unknown buffer durations.
DCHECK_NE(duration, kNoTimestamp);
if (duration > base::TimeDelta() && !buffer->is_duration_estimated()) {
timestamp += duration;
} else {
// TODO(chcunningham): Emit warning when 0ms durations are not expected.
// http://crbug.com/312836
timestamp += base::TimeDelta::FromMicroseconds(1);
}
end_pts = std::max(timestamp, end_pts);
}
*start = start_pts;
*end = end_pts;
}
bool SourceBufferStream::IsNextGopAdjacentToEndOfCurrentAppendSequence(
base::TimeDelta next_gop_timestamp) const {
base::TimeDelta upper_bound = highest_timestamp_in_append_sequence_ +
ComputeFudgeRoom(GetMaxInterbufferDistance());
DVLOG(4) << __func__ << " " << GetStreamTypeName()
<< " next_gop_timestamp=" << next_gop_timestamp.InMicroseconds()
<< "us, highest_timestamp_in_append_sequence_="
<< highest_timestamp_in_append_sequence_.InMicroseconds()
<< "us, upper_bound=" << upper_bound.InMicroseconds() << "us";
return highest_timestamp_in_append_sequence_ < next_gop_timestamp &&
next_gop_timestamp <= upper_bound;
}
void SourceBufferStream::PruneTrackBuffer(const base::TimeDelta timestamp) {
DCHECK(timestamp != kNoTimestamp);
// Scan forward until we find a buffer with timestamp at or beyond the limit.
// Then remove all those at and beyond that point.
size_t goal_size = 0; // The number of buffers we will keep in the result.
for (const auto& buf : track_buffer_) {
if (buf->timestamp() >= timestamp)
break;
goal_size++;
}
while (track_buffer_.size() > goal_size) {
track_buffer_.pop_back();
}
DVLOG(3) << __func__ << " " << GetStreamTypeName()
<< " Removed all buffers in track buffer sequence starting with the "
"first at timestamp >= "
<< timestamp.InMicroseconds()
<< "us. New track buffer size:" << track_buffer_.size();
}
void SourceBufferStream::MergeWithNextRangeIfNecessary(
const RangeList::iterator& range_with_new_buffers_itr) {
DCHECK(range_with_new_buffers_itr != ranges_.end());
SourceBufferRange* range_with_new_buffers = range_with_new_buffers_itr->get();
RangeList::iterator next_range_itr = range_with_new_buffers_itr;
++next_range_itr;
if (next_range_itr == ranges_.end() ||
!range_with_new_buffers->CanAppendRangeToEnd(**next_range_itr)) {
return;
}
bool transfer_current_position = selected_range_ == next_range_itr->get();
DVLOG(3) << __func__ << " " << GetStreamTypeName() << " merging "
<< RangeToString(*range_with_new_buffers) << " into "
<< RangeToString(**next_range_itr);
range_with_new_buffers->AppendRangeToEnd(**next_range_itr,
transfer_current_position);
// Update |selected_range_| pointer if |range| has become selected after
// merges.
if (transfer_current_position)
SetSelectedRange(range_with_new_buffers);
if (next_range_itr == range_for_next_append_)
range_for_next_append_ = range_with_new_buffers_itr;
DeleteAndRemoveRange(&next_range_itr);
}
void SourceBufferStream::MergeAllAdjacentRanges() {
DVLOG(1) << __func__ << " " << GetStreamTypeName()
<< ": Before: ranges_=" << RangesToString(ranges_);
auto range_itr = ranges_.begin();
while (range_itr != ranges_.end()) {
const size_t old_ranges_size = ranges_.size();
MergeWithNextRangeIfNecessary(range_itr);
// Only proceed to the next range if the current range didn't merge with it.
if (old_ranges_size == ranges_.size())
range_itr++;
}
DVLOG(1) << __func__ << " " << GetStreamTypeName()
<< ": After: ranges_=" << RangesToString(ranges_);
}
void SourceBufferStream::Seek(base::TimeDelta timestamp) {
DCHECK(timestamp >= base::TimeDelta());
DVLOG(1) << __func__ << " " << GetStreamTypeName() << " ("
<< timestamp.InMicroseconds() << "us)";
ResetSeekState();
seek_buffer_timestamp_ = timestamp;
seek_pending_ = true;
if (ShouldSeekToStartOfBuffered(timestamp)) {
ranges_.front()->SeekToStart();
SetSelectedRange(ranges_.front().get());
seek_pending_ = false;
return;
}
auto itr = ranges_.end();
for (itr = ranges_.begin(); itr != ranges_.end(); ++itr) {
if ((*itr)->CanSeekTo(timestamp))
break;
}
if (itr == ranges_.end())
return;
if (!audio_configs_.empty()) {
// Adjust |timestamp| for an Opus stream backward up to the config's seek
// preroll, but not further than the range start time, and not at all if
// there is a config change in the middle of that preroll interval. If
// |timestamp| is already before the range start time, as can happen due to
// fudge room, do not adjust it.
const auto& config = audio_configs_[(*itr)->GetConfigIdAtTime(timestamp)];
if (config.codec() == kCodecOpus &&
timestamp > (*itr)->GetStartTimestamp()) {
base::TimeDelta preroll_timestamp = std::max(
timestamp - config.seek_preroll(), (*itr)->GetStartTimestamp());
if ((*itr)->CanSeekTo(preroll_timestamp) &&
(*itr)->SameConfigThruRange(preroll_timestamp, timestamp)) {
timestamp = preroll_timestamp;
}
}
}
SeekAndSetSelectedRange(itr->get(), timestamp);
seek_pending_ = false;
}
bool SourceBufferStream::IsSeekPending() const {
return seek_pending_ && !IsEndOfStreamReached();
}
// TODO(wolenetz): Disallow duration changes that truncate buffered media. See
// https://crbug.com/623729.
void SourceBufferStream::OnSetDuration(base::TimeDelta duration) {
DVLOG(1) << __func__ << " " << GetStreamTypeName() << " ("
<< duration.InMicroseconds() << "us)";
DCHECK(!end_of_stream_);
if (ranges_.empty())
return;
base::TimeDelta start = duration;
base::TimeDelta end = ranges_.back()->GetBufferedEndTimestamp();
// Trim the end if it exceeds the new duration.
if (start < end) {
BufferQueue deleted_buffers;
RemoveInternal(start, end, false, &deleted_buffers);
if (!deleted_buffers.empty()) {
// Truncation removed current position. Clear selected range.
SetSelectedRange(NULL);
}
}
}
SourceBufferStreamStatus SourceBufferStream::GetNextBuffer(
scoped_refptr<StreamParserBuffer>* out_buffer) {
DVLOG(2) << __func__ << " " << GetStreamTypeName();
if (!pending_buffer_.get()) {
const SourceBufferStreamStatus status = GetNextBufferInternal(out_buffer);
if (status != SourceBufferStreamStatus::kSuccess ||
!SetPendingBuffer(out_buffer)) {
DVLOG(2) << __func__ << " " << GetStreamTypeName()
<< ": no pending buffer, returning status "
<< StatusToString(status);
return status;
}
}
DCHECK(pending_buffer_->preroll_buffer().get());
const SourceBufferStreamStatus status =
HandleNextBufferWithPreroll(out_buffer);
DVLOG(2) << __func__ << " " << GetStreamTypeName()
<< ": handled next buffer with preroll, returning status "
<< StatusToString(status);
return status;
}
SourceBufferStreamStatus SourceBufferStream::HandleNextBufferWithPreroll(
scoped_refptr<StreamParserBuffer>* out_buffer) {
// Any config change should have already been handled.
DCHECK_EQ(current_config_index_, pending_buffer_->GetConfigId());
// Check if the preroll buffer has already been handed out.
if (!pending_buffers_complete_) {
pending_buffers_complete_ = true;
*out_buffer = pending_buffer_->preroll_buffer();
return SourceBufferStreamStatus::kSuccess;
}
// Preroll complete, hand out the final buffer.
*out_buffer = std::move(pending_buffer_);
return SourceBufferStreamStatus::kSuccess;
}
SourceBufferStreamStatus SourceBufferStream::GetNextBufferInternal(
scoped_refptr<StreamParserBuffer>* out_buffer) {
CHECK(!config_change_pending_);
if (!track_buffer_.empty()) {
DCHECK(!selected_range_);
if (track_buffer_.front()->GetConfigId() != current_config_index_) {
config_change_pending_ = true;
DVLOG(1) << "Config change (track buffer config ID does not match).";
return SourceBufferStreamStatus::kConfigChange;
}
DVLOG(3) << __func__ << " Next buffer coming from track_buffer_";
*out_buffer = std::move(track_buffer_.front());
track_buffer_.pop_front();
WarnIfTrackBufferExhaustionSkipsForward(*out_buffer);
highest_output_buffer_timestamp_ =
std::max(highest_output_buffer_timestamp_, (*out_buffer)->timestamp());
// If the track buffer becomes empty, then try to set the selected range
// based on the timestamp of this buffer being returned.
if (track_buffer_.empty()) {
just_exhausted_track_buffer_ = true;
SetSelectedRangeIfNeeded(highest_output_buffer_timestamp_);
}
return SourceBufferStreamStatus::kSuccess;
}
DCHECK(track_buffer_.empty());
if (!selected_range_ || !selected_range_->HasNextBuffer()) {
if (IsEndOfStreamReached()) {
return SourceBufferStreamStatus::kEndOfStream;
}
DVLOG(3) << __func__ << " " << GetStreamTypeName()
<< ": returning kNeedBuffer "
<< (selected_range_ ? "(selected range has no next buffer)"
: "(no selected range)");
return SourceBufferStreamStatus::kNeedBuffer;
}
if (selected_range_->GetNextConfigId() != current_config_index_) {
config_change_pending_ = true;
DVLOG(1) << "Config change (selected range config ID does not match).";
return SourceBufferStreamStatus::kConfigChange;
}
CHECK(selected_range_->GetNextBuffer(out_buffer));
WarnIfTrackBufferExhaustionSkipsForward(*out_buffer);
highest_output_buffer_timestamp_ =
std::max(highest_output_buffer_timestamp_, (*out_buffer)->timestamp());
return SourceBufferStreamStatus::kSuccess;
}
void SourceBufferStream::WarnIfTrackBufferExhaustionSkipsForward(
scoped_refptr<StreamParserBuffer> next_buffer) {
if (!just_exhausted_track_buffer_)
return;
just_exhausted_track_buffer_ = false;
DCHECK(next_buffer->is_key_frame());
base::TimeDelta next_output_buffer_timestamp = next_buffer->timestamp();
base::TimeDelta delta =
next_output_buffer_timestamp - highest_output_buffer_timestamp_;
if (delta > GetMaxInterbufferDistance()) {
LIMITED_MEDIA_LOG(DEBUG, media_log_, num_track_buffer_gap_warning_logs_,
kMaxTrackBufferGapWarningLogs)
<< "Media append that overlapped current playback position may cause "
"time gap in playing "
<< GetStreamTypeName() << " stream because the next keyframe is "
<< delta.InMilliseconds()
<< "ms beyond last overlapped frame. Media may appear temporarily "
"frozen.";
}
}
base::TimeDelta SourceBufferStream::GetNextBufferTimestamp() {
if (!track_buffer_.empty())
return track_buffer_.front()->timestamp();
if (!selected_range_)
return kNoTimestamp;
DCHECK(selected_range_->HasNextBufferPosition());
return selected_range_->GetNextTimestamp();
}
SourceBufferStream::RangeList::iterator
SourceBufferStream::FindExistingRangeFor(base::TimeDelta start_timestamp) {
for (auto itr = ranges_.begin(); itr != ranges_.end(); ++itr) {
if ((*itr)->BelongsToRange(start_timestamp))
return itr;
}
return ranges_.end();
}
SourceBufferStream::RangeList::iterator SourceBufferStream::AddToRanges(
std::unique_ptr<SourceBufferRange> new_range) {
base::TimeDelta start_timestamp = new_range->GetStartTimestamp();
auto itr = ranges_.end();
for (itr = ranges_.begin(); itr != ranges_.end(); ++itr) {
if ((*itr)->GetStartTimestamp() > start_timestamp)
break;
}
return ranges_.insert(itr, std::move(new_range));
}
void SourceBufferStream::SeekAndSetSelectedRange(
SourceBufferRange* range,
base::TimeDelta seek_timestamp) {
if (range)
range->Seek(seek_timestamp);
SetSelectedRange(range);
}
void SourceBufferStream::SetSelectedRange(SourceBufferRange* range) {
DVLOG(1) << __func__ << " " << GetStreamTypeName() << ": " << selected_range_
<< " " << (selected_range_ ? RangeToString(*selected_range_) : "")
<< " -> " << range << " " << (range ? RangeToString(*range) : "");
if (selected_range_)
selected_range_->ResetNextBufferPosition();
DCHECK(!range || range->HasNextBufferPosition());
selected_range_ = range;
}
Ranges<base::TimeDelta> SourceBufferStream::GetBufferedTime() const {
Ranges<base::TimeDelta> ranges;
for (auto itr = ranges_.begin(); itr != ranges_.end(); ++itr) {
ranges.Add((*itr)->GetStartTimestamp(), (*itr)->GetBufferedEndTimestamp());
}
return ranges;
}
base::TimeDelta SourceBufferStream::GetHighestPresentationTimestamp() const {
if (ranges_.empty())
return base::TimeDelta();
return ranges_.back()->GetEndTimestamp();
}
base::TimeDelta SourceBufferStream::GetBufferedDuration() const {
if (ranges_.empty())
return base::TimeDelta();
return ranges_.back()->GetBufferedEndTimestamp();
}
size_t SourceBufferStream::GetBufferedSize() const {
size_t ranges_size = 0;
for (const auto& range_ptr : ranges_)
ranges_size += range_ptr->size_in_bytes();
return ranges_size;
}
void SourceBufferStream::MarkEndOfStream() {
DCHECK(!end_of_stream_);
end_of_stream_ = true;
}
void SourceBufferStream::UnmarkEndOfStream() {
DCHECK(end_of_stream_);
end_of_stream_ = false;
}
bool SourceBufferStream::IsEndOfStreamReached() const {
if (!end_of_stream_ || !track_buffer_.empty())
return false;
if (ranges_.empty())
return true;
if (seek_pending_) {
base::TimeDelta last_range_end_time =
ranges_.back()->GetBufferedEndTimestamp();
return seek_buffer_timestamp_ >= last_range_end_time;
}
if (!selected_range_)
return true;
return selected_range_ == ranges_.back().get();
}
const AudioDecoderConfig& SourceBufferStream::GetCurrentAudioDecoderConfig() {
if (config_change_pending_)
CompleteConfigChange();
// Trying to track down crash. http://crbug.com/715761
CHECK(current_config_index_ >= 0 &&
static_cast<size_t>(current_config_index_) < audio_configs_.size());
return audio_configs_[current_config_index_];
}
const VideoDecoderConfig& SourceBufferStream::GetCurrentVideoDecoderConfig() {
if (config_change_pending_)
CompleteConfigChange();
// Trying to track down crash. http://crbug.com/715761
CHECK(current_config_index_ >= 0 &&
static_cast<size_t>(current_config_index_) < video_configs_.size());
return video_configs_[current_config_index_];
}
const TextTrackConfig& SourceBufferStream::GetCurrentTextTrackConfig() {
return text_track_config_;
}
base::TimeDelta SourceBufferStream::GetMaxInterbufferDistance() const {
return max_interbuffer_distance_;
}
bool SourceBufferStream::UpdateAudioConfig(const AudioDecoderConfig& config,
bool allow_codec_change) {
DCHECK(!audio_configs_.empty());
DCHECK(video_configs_.empty());
DVLOG(3) << "UpdateAudioConfig.";
if (!allow_codec_change &&
audio_configs_[append_config_index_].codec() != config.codec()) {
// TODO(wolenetz): When we relax addSourceBuffer() and changeType() codec
// strictness, codec changes should be allowed even without changing the
// bytestream.
// TODO(wolenetz): Remove "experimental" from this error message when
// changeType() ships without needing experimental blink flag.
MEDIA_LOG(ERROR, media_log_) << "Audio codec changes not allowed unless "
"using experimental changeType().";
return false;
}
// Check to see if the new config matches an existing one.
for (size_t i = 0; i < audio_configs_.size(); ++i) {
if (config.Matches(audio_configs_[i])) {
append_config_index_ = i;
return true;
}
}
// No matches found so let's add this one to the list.
append_config_index_ = audio_configs_.size();
DVLOG(2) << "New audio config - index: " << append_config_index_;
audio_configs_.resize(audio_configs_.size() + 1);
audio_configs_[append_config_index_] = config;
return true;
}
bool SourceBufferStream::UpdateVideoConfig(const VideoDecoderConfig& config,
bool allow_codec_change) {
DCHECK(!video_configs_.empty());
DCHECK(audio_configs_.empty());
DVLOG(3) << "UpdateVideoConfig.";
if (!allow_codec_change &&
video_configs_[append_config_index_].codec() != config.codec()) {
// TODO(wolenetz): When we relax addSourceBuffer() and changeType() codec
// strictness, codec changes should be allowed even without changing the
// bytestream.
// TODO(wolenetz): Remove "experimental" from this error message when
// changeType() ships without needing experimental blink flag.
MEDIA_LOG(ERROR, media_log_) << "Video codec changes not allowed unless "
"using experimental changeType()";
return false;
}
// Check to see if the new config matches an existing one.
for (size_t i = 0; i < video_configs_.size(); ++i) {
if (config.Matches(video_configs_[i])) {
append_config_index_ = i;
return true;
}
}
// No matches found so let's add this one to the list.
append_config_index_ = video_configs_.size();
DVLOG(2) << "New video config - index: " << append_config_index_;
video_configs_.resize(video_configs_.size() + 1);
video_configs_[append_config_index_] = config;
return true;
}
void SourceBufferStream::CompleteConfigChange() {
config_change_pending_ = false;
if (!track_buffer_.empty()) {
current_config_index_ = track_buffer_.front()->GetConfigId();
return;
}
if (selected_range_ && selected_range_->HasNextBuffer())
current_config_index_ = selected_range_->GetNextConfigId();
}
void SourceBufferStream::SetSelectedRangeIfNeeded(
const base::TimeDelta timestamp) {
DVLOG(2) << __func__ << " " << GetStreamTypeName() << "("
<< timestamp.InMicroseconds() << "us)";
if (selected_range_) {
DCHECK(track_buffer_.empty());
return;
}
if (!track_buffer_.empty()) {
DCHECK(!selected_range_);
return;
}
base::TimeDelta start_timestamp = timestamp;
// If the next buffer timestamp is not known then use a timestamp just after
// the timestamp on the last buffer returned by GetNextBuffer().
if (start_timestamp == kNoTimestamp) {
if (highest_output_buffer_timestamp_ == kNoTimestamp) {
DVLOG(2) << __func__ << " " << GetStreamTypeName()
<< " no previous output timestamp";
return;
}
start_timestamp =
highest_output_buffer_timestamp_ + base::TimeDelta::FromMicroseconds(1);
}
base::TimeDelta seek_timestamp =
FindNewSelectedRangeSeekTimestamp(start_timestamp);
// If we don't have buffered data to seek to, then return.
if (seek_timestamp == kNoTimestamp) {
DVLOG(2) << __func__ << " " << GetStreamTypeName()
<< " couldn't find new selected range seek timestamp";
return;
}
DCHECK(track_buffer_.empty());
SeekAndSetSelectedRange(FindExistingRangeFor(seek_timestamp)->get(),
seek_timestamp);
}
base::TimeDelta SourceBufferStream::FindNewSelectedRangeSeekTimestamp(
const base::TimeDelta start_timestamp) {
DCHECK(start_timestamp != kNoTimestamp);
DCHECK(start_timestamp >= base::TimeDelta());
auto itr = ranges_.begin();
// When checking a range to see if it has or begins soon enough after
// |start_timestamp|, use the fudge room to determine "soon enough".
base::TimeDelta start_timestamp_plus_fudge =
start_timestamp + ComputeFudgeRoom(GetMaxInterbufferDistance());
// Multiple ranges could be within the fudge room, because the fudge room is
// dynamic based on max inter-buffer distance seen so far. Optimistically
// check the earliest ones first.
for (; itr != ranges_.end(); ++itr) {
base::TimeDelta range_start = (*itr)->GetStartTimestamp();
if (range_start >= start_timestamp_plus_fudge)
break;
if ((*itr)->GetEndTimestamp() < start_timestamp)
continue;
base::TimeDelta search_timestamp = start_timestamp;
if (start_timestamp < range_start &&
start_timestamp_plus_fudge >= range_start) {
search_timestamp = range_start;
}
base::TimeDelta keyframe_timestamp =
(*itr)->NextKeyframeTimestamp(search_timestamp);
if (keyframe_timestamp != kNoTimestamp)
return keyframe_timestamp;
}
DVLOG(2) << __func__ << " " << GetStreamTypeName()
<< " no buffered data for pts=" << start_timestamp.InMicroseconds()
<< "us";
return kNoTimestamp;
}
base::TimeDelta SourceBufferStream::FindKeyframeAfterTimestamp(
const base::TimeDelta timestamp) {
DCHECK(timestamp != kNoTimestamp);
auto itr = FindExistingRangeFor(timestamp);
if (itr == ranges_.end())
return kNoTimestamp;
// First check for a keyframe timestamp >= |timestamp|
// in the current range.
return (*itr)->NextKeyframeTimestamp(timestamp);
}
std::string SourceBufferStream::GetStreamTypeName() const {
switch (GetType()) {
case SourceBufferStreamType::kAudio:
return "AUDIO";
case SourceBufferStreamType::kVideo:
return "VIDEO";
case SourceBufferStreamType::kText:
return "TEXT";
}
NOTREACHED();
return "";
}
SourceBufferStreamType SourceBufferStream::GetType() const {
if (!audio_configs_.empty())
return SourceBufferStreamType::kAudio;
if (!video_configs_.empty())
return SourceBufferStreamType::kVideo;
DCHECK_NE(text_track_config_.kind(), kTextNone);
return SourceBufferStreamType::kText;
}
void SourceBufferStream::DeleteAndRemoveRange(RangeList::iterator* itr) {
DVLOG(1) << __func__;
DCHECK(*itr != ranges_.end());
if ((*itr)->get() == selected_range_) {
DVLOG(1) << __func__ << " deleting selected range.";
SetSelectedRange(NULL);
}
if (*itr == range_for_next_append_) {
DVLOG(1) << __func__ << " deleting range_for_next_append_.";
range_for_next_append_ = ranges_.end();
ResetLastAppendedState();
}
*itr = ranges_.erase(*itr);
}
bool SourceBufferStream::SetPendingBuffer(
scoped_refptr<StreamParserBuffer>* out_buffer) {
DCHECK(out_buffer->get());
DCHECK(!pending_buffer_.get());
const bool have_preroll_buffer = !!(*out_buffer)->preroll_buffer().get();
if (!have_preroll_buffer)
return false;
pending_buffer_.swap(*out_buffer);
pending_buffers_complete_ = false;
return true;
}
} // namespace media