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# Copyright 2014 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.
# Do not expand this list without double-checking with OWNERS, this is a list of
# all targets which roll up into the //media component. It controls visibility
# of subcomponent targets and public_deps for //media.
media_subcomponent_deps = [
# TODO( These files should not be in //media/base.
declare_args() {
# Allows distributions to link pulseaudio directly (DT_NEEDED) instead of
# using dlopen. This helps with automated detection of ABI mismatches and
# prevents silent errors.
link_pulseaudio = false
# Enable usage of FFmpeg within the media library. Used for most software
# based decoding, demuxing, and sometimes optimized FFTs. If disabled,
# implementors must provide their own demuxers and decoders.
media_use_ffmpeg = true
# Enable usage of libvpx within the media library. Used for software based
# decoding of VP9 and VP8A type content.
media_use_libvpx = true
# iOS doesn't use ffmpeg, libvpx.
if (is_ios) {
media_use_ffmpeg = false
media_use_libvpx = false
# Override to dynamically link the cras (ChromeOS audio) library.
use_cras = false
# Enables AC3/EAC3 audio demuxing. This is enabled only on Chromecast, since
# it only provides demuxing, and is only useful for AC3/EAC3 audio
# pass-through to HDMI sink on Chromecast.
enable_ac3_eac3_audio_demuxing = proprietary_codecs && is_chromecast
enable_mpeg_h_audio_demuxing = proprietary_codecs && is_chromecast
enable_mse_mpeg2ts_stream_parser =
proprietary_codecs && (is_chromecast || use_fuzzing_engine)
# Enable parsing for the 'cbcs' encryption scheme added by MPEG Common
# Encryption 3rd Edition (ISO/IEC 23001-7), published 02/15/2016.
enable_cbcs_encryption_scheme =
is_chromecast || is_mac || is_win || is_linux || is_android
# Enable HEVC/H265 demuxing. Actual decoding must be provided by the
# platform. Enable by default for Chromecast.
enable_hevc_demuxing = proprietary_codecs && is_chromecast
# Enable Dolby Vision demuxing. Enable by default for Chromecast. Actual
# decoding must be provided by the platform. Note some Dolby Vision profiles
# which are encoded using HEVC require |enable_hevc_demuxing| to be enabled.
enable_dolby_vision_demuxing = proprietary_codecs && is_chromecast
# Enable HLS with SAMPLE-AES decryption.
enable_hls_sample_aes = proprietary_codecs && is_chromecast
# Enable logging override, e.g. enable DVLOGs at build time. Must not be
# enabled when |use_jumbo_build| is true, in which case multiple .cc files
# are combined and we could override more logging than expected.
enable_logging_override = !use_jumbo_build && is_chromecast
# TODO( Fix media_unittests for fuchsia X64.
enable_dav1d_decoder = !is_android && !is_ios && !is_fuchsia
declare_args() {
enable_av1_decoder = enable_dav1d_decoder || enable_libaom_decoder
# enable_hls_sample_aes can only be true if enable_mse_mpeg2ts_stream_parser is.
assert(enable_mse_mpeg2ts_stream_parser || !enable_hls_sample_aes)
# Logging override must not be enabled in jumbo builds.
assert(!use_jumbo_build || !enable_logging_override)
if (media_use_ffmpeg) {
media_subcomponent_deps += [ "//media/ffmpeg" ]
# Use a second declare_args() to pick up possible overrides of |use_cras|.
declare_args() {
# Enables runtime selection of PulseAudio library.
use_pulseaudio = false
# Enables runtime selection of ALSA library for audio.
use_alsa = false
# Alsa should be used on non-Android, non-Mac POSIX systems.
# Alsa should be used on desktop Chromecast and audio-only Chromecast builds.
if (is_posix && !is_android && !is_mac &&
(!is_chromecast || is_cast_desktop_build || is_cast_audio_only)) {
use_alsa = true
# Pulse is not supported on Chromecast platforms.
if (!use_cras && !is_chromecast) {
use_pulseaudio = true
# Use another declare_args() to pick up possible overrides of media_use_ffmpeg
# from --args command line flags. See "gn help declare_args".
declare_args() {
# On Android, FFMpeg is built without video decoders by default.
# This flag gives the option to override that decision in case there are no
# hardware decoders. To do so, you will also need to update ffmpeg build files
# in order to define which decoders to build in.
enable_ffmpeg_video_decoders = media_use_ffmpeg && !is_android
# Enables the use of library CDMs that implements the interface defined at
# media/cdm/api/content_decryption_module.h. If true, the actually library CDM
# will be hosted in the mojo CDM service running in the CDM (utility) process.
enable_library_cdms = (is_linux && !is_chromecast) || is_mac || is_win
declare_args() {
# Experiment to enable mojo media services (e.g. "renderer", "cdm", see
# |mojo_media_services|). When enabled, selected mojo paths will be enabled in
# the media pipeline and corresponding services will hosted in the selected
# remote process (e.g. "utility" process, see |mojo_media_host|).
enable_mojo_media =
is_android || is_chromecast || is_chromeos || is_mac || is_win ||
enable_library_cdms || (is_desktop_linux && use_vaapi)
# Enable the TestMojoMediaClient to be used in mojo MediaService. This is for
# testing only and will override the default platform MojoMediaClient, if any.
enable_test_mojo_media_client = false
# When enabled, this feature allows developers to use a runtime flag to
# choose the implementation of the renderer that is used. On a build which
# enables the mojo renderer, if --disable-mojo-renderer is passed at start-up,
# the "default" renderer will be used instead. Both renderer implementations
# will be linked if this feature is enabled, increasing the binary size. This
# feature does not make sense if the mojo renderer is not enabled.
enable_runtime_media_renderer_selection = is_cast_desktop_build
# Enables host verification for CDMs.
# Windows and Mac.
enable_cdm_host_verification =
enable_library_cdms && (is_mac || is_win) && is_chrome_branded
# Enable Storage ID which is used by CDMs. This is only available with chrome
# branding, but may be overridden by other embedders.
enable_cdm_storage_id = enable_library_cdms && is_chrome_branded &&
(is_win || is_mac || is_chromeos)
# If |enable_cdm_storage_id| is set, then an implementation specific key
# must also be provided. It can be provided by defining CDM_STORAGE_ID_KEY
# (which takes precedence), or by setting |alternate_cdm_storage_id_key|.
# The key must be a string of at least 32 characters.
alternate_cdm_storage_id_key = ""
# This feature can only be enabled when using Mojo media. Furthermore, the
# "renderer" service must be enabled, which is asserted in
# //media/mojo/services/
!enable_runtime_media_renderer_selection || enable_mojo_media,
"Runtime media renderer selection only applies when mojo media is enabled.")
assert(!enable_cdm_host_verification || is_mac || is_win,
"CDM host verification is only supported on Mac and Windows.")
_default_mojo_media_services = []
_default_mojo_media_host = "none"
# Default mojo_media_services and mojo_media_host on various platforms.
# Can be overridden by gn build arguments from the --args command line flag
# for local testing.
if (enable_mojo_media) {
if (is_chromecast) {
_default_mojo_media_services = cast_mojo_media_services
_default_mojo_media_host = cast_mojo_media_host
} else if (is_android) {
_default_mojo_media_services = [
_default_mojo_media_host = "gpu"
} else if (is_chromeos || is_mac || is_win ||
(is_desktop_linux && use_vaapi)) {
_default_mojo_media_services = [ "video_decoder" ]
_default_mojo_media_host = "gpu"
if (enable_library_cdms) {
_default_mojo_media_services += [ "cdm" ]
# Having a CDM running means it could require a CdmProxy running in the GPU
# process.
_default_mojo_media_host == "none" || _default_mojo_media_host == "gpu",
"For now, mojo_media_host should not overwrite it with a different " +
"value if it has been set.")
_default_mojo_media_host = "gpu"
# Use another declare_args() to pick up possible overrides of enable_mojo_media
# from --args command line flags. See "gn help declare_args".
declare_args() {
# A list of mojo media services that should be used in the media pipeline.
# Must not be empty if |enable_mojo_media| is true.
# Valid entries in the list are:
# - "renderer": Use mojo-based media Renderer service.
# - "cdm": Use mojo-based Content Decryption Module.
# - "audio_decoder": Use mojo-based audio decoder in the default media
# Renderer. Cannot be used with the mojo Renderer above.
# - "video_decoder": Use mojo-based video decoder in the default media
# Renderer. Cannot be used with the mojo Renderer above.
mojo_media_services = _default_mojo_media_services
# The process that the mojo MediaService runs in. By default, all services
# registered in |mojo_media_services| are hosted in the MediaService, with the
# exception that when |enable_library_cdms| is true, the "cdm" service will
# run in a separate CdmService in the CDM (utility) process, while other
# |mojo_media_services| still run in the MediaService in the process specified
# by "mojo_media_host".
# Valid options are:
# - "none": Do not use mojo media service.
# - "browser": Use mojo media service hosted in the browser process.
# - "gpu": Use mojo media service hosted in the gpu process.
# - "utility": Use mojo media service hosted in the utility process.
mojo_media_host = _default_mojo_media_host
declare_args() {
# This switch defines whether the Media Remoting implementation will be built.
# When enabled, media is allowed to be renderer and played back on remote
# devices when the tab is being casted and other conditions are met.
enable_media_remoting = !is_chromecast && !is_ios
declare_args() {
# Media Remoting RPC is disabled on Android since it's unused but increases
# the native binary size by ~70Kb.
enable_media_remoting_rpc = enable_media_remoting && !is_android