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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/mediastream/media_stream_audio_track.h"
#include <atomic>
#include <string>
#include <utility>
#include "base/check_op.h"
#include "base/strings/to_string.h"
#include "base/synchronization/lock.h"
#include "base/time/time.h"
#include "media/base/audio_bus.h"
#include "media/base/audio_glitch_info.h"
#include "media/base/audio_timestamp_helper.h"
#include "third_party/blink/public/platform/modules/mediastream/web_media_stream_audio_sink.h"
#include "third_party/blink/public/platform/modules/mediastream/web_media_stream_source.h"
#include "third_party/blink/public/platform/modules/webrtc/webrtc_logging.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_audio_source.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_component.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_source.h"
namespace blink {
namespace {
constexpr char kTag[] = "MSAT::";
} // namespace
MediaStreamAudioTrack::MediaStreamAudioTrack(bool is_local_track)
: MediaStreamTrackPlatform(is_local_track), is_enabled_(1) {
WebRtcLog(kTag, this, "%s({is_local_track=%s})", __func__,
base::ToString(is_local_track).c_str());
}
MediaStreamAudioTrack::~MediaStreamAudioTrack() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
WebRtcLog(kTag, this, "%s()", __func__);
Stop();
}
std::unique_ptr<MediaStreamTrackPlatform>
MediaStreamAudioTrack::CreateFromComponent(
const MediaStreamComponent* component,
const String& id) {
MediaStreamSource* source = component->Source();
CHECK_EQ(source->GetType(), MediaStreamSource::kTypeAudio);
return MediaStreamAudioSource::From(source)->CreateMediaStreamAudioTrack(
id.Utf8());
}
// static
MediaStreamAudioTrack* MediaStreamAudioTrack::From(
const MediaStreamComponent* component) {
if (!component ||
component->GetSourceType() != MediaStreamSource::kTypeAudio) {
return nullptr;
}
return static_cast<MediaStreamAudioTrack*>(component->GetPlatformTrack());
}
void MediaStreamAudioTrack::AddSink(WebMediaStreamAudioSink* sink) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
WebRtcLog(kTag, this, "%s()", __func__);
// If the track has already stopped, just notify the sink of this fact without
// adding it.
if (stop_callback_.is_null()) {
sink->OnReadyStateChanged(WebMediaStreamSource::kReadyStateEnded);
return;
}
deliverer_.AddConsumer(sink);
sink->OnEnabledChanged(is_enabled_.load(std::memory_order_relaxed));
}
void MediaStreamAudioTrack::RemoveSink(WebMediaStreamAudioSink* sink) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
WebRtcLog(kTag, this, "%s()", __func__);
deliverer_.RemoveConsumer(sink);
}
media::AudioParameters MediaStreamAudioTrack::GetOutputFormat() const {
return deliverer_.GetAudioParameters();
}
void MediaStreamAudioTrack::SetEnabled(bool enabled) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
WebRtcLog(kTag, this, "%s({enabled=%s})", __func__,
base::ToString(enabled).c_str());
const bool previously_enabled =
is_enabled_.exchange(enabled, std::memory_order_relaxed);
if (enabled == previously_enabled)
return;
Vector<WebMediaStreamAudioSink*> sinks_to_notify;
deliverer_.GetConsumerList(&sinks_to_notify);
for (WebMediaStreamAudioSink* sink : sinks_to_notify)
sink->OnEnabledChanged(enabled);
}
bool MediaStreamAudioTrack::IsEnabled() const {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
return is_enabled_.load(std::memory_order_relaxed);
}
void MediaStreamAudioTrack::SetContentHint(
WebMediaStreamTrack::ContentHintType content_hint) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
Vector<WebMediaStreamAudioSink*> sinks_to_notify;
deliverer_.GetConsumerList(&sinks_to_notify);
for (WebMediaStreamAudioSink* sink : sinks_to_notify)
sink->OnContentHintChanged(content_hint);
}
int MediaStreamAudioTrack::NumPreferredChannels() const {
return deliverer_.NumPreferredChannels();
}
void* MediaStreamAudioTrack::GetClassIdentifier() const {
return nullptr;
}
void MediaStreamAudioTrack::Start(base::OnceClosure stop_callback) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(!stop_callback.is_null());
DCHECK(stop_callback_.is_null());
WebRtcLog(kTag, this, "%s()", __func__);
stop_callback_ = std::move(stop_callback);
}
void MediaStreamAudioTrack::StopAndNotify(base::OnceClosure callback) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
WebRtcLog(kTag, this, "%s()", __func__);
if (!stop_callback_.is_null())
std::move(stop_callback_).Run();
Vector<WebMediaStreamAudioSink*> sinks_to_end;
deliverer_.GetConsumerList(&sinks_to_end);
for (WebMediaStreamAudioSink* sink : sinks_to_end) {
deliverer_.RemoveConsumer(sink);
sink->OnReadyStateChanged(WebMediaStreamSource::kReadyStateEnded);
}
if (callback)
std::move(callback).Run();
weak_factory_.InvalidateWeakPtrs();
}
void MediaStreamAudioTrack::OnSetFormat(const media::AudioParameters& params) {
WebRtcLog(kTag, this, "%s({params: [%s]})", __func__,
params.AsHumanReadableString().c_str());
deliverer_.OnSetFormat(params);
}
void MediaStreamAudioTrack::OnData(const media::AudioBus& audio_bus,
base::TimeTicks reference_time,
const media::AudioGlitchInfo& glitch_info) {
TRACE_EVENT2(TRACE_DISABLED_BY_DEFAULT("mediastream"),
"MediaStreamAudioTrack::OnData", "this",
static_cast<void*>(this), "frame", audio_bus.frames());
if (!received_audio_callback_) {
// Add log message with unique this pointer id to mark the audio track as
// alive at the first data callback.
WebRtcLog(kTag, this, "%s() => (audio track is alive))", __func__);
received_audio_callback_ = true;
}
// Note: Using relaxed ordering because the timing of when the audio thread
// sees a changed |is_enabled_| value can be relaxed.
const bool deliver_data = is_enabled_.load(std::memory_order_relaxed);
if (deliver_data) {
UpdateFrameStats(audio_bus, reference_time, glitch_info);
deliverer_.OnData(audio_bus, reference_time, glitch_info);
} else {
// The W3C spec requires silent audio to flow while a track is disabled.
if (!silent_bus_ || silent_bus_->channels() != audio_bus.channels() ||
silent_bus_->frames() != audio_bus.frames()) {
silent_bus_ =
media::AudioBus::Create(audio_bus.channels(), audio_bus.frames());
silent_bus_->Zero();
}
deliverer_.OnData(*silent_bus_, reference_time, {});
}
}
void MediaStreamAudioTrack::TransferAudioFrameStatsTo(
MediaStreamTrackPlatform::AudioFrameStats& destination) {
base::AutoLock auto_lock(mainthread_frame_stats_lock_);
destination.Absorb(mainthread_frame_stats_);
}
void MediaStreamAudioTrack::UpdateFrameStats(
const media::AudioBus& audio_bus,
base::TimeTicks reference_time,
const media::AudioGlitchInfo& glitch_info) {
pending_frame_stats_.Update(GetOutputFormat(), reference_time, glitch_info);
// If the main thread does not already hold the lock, take it and transfer
// the latest stats to the main thread.
if (mainthread_frame_stats_lock_.Try()) {
mainthread_frame_stats_.Absorb(pending_frame_stats_);
mainthread_frame_stats_lock_.Release();
}
}
} // namespace blink
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