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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name of Google Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/platform/mediastream/media_stream_source.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_audio_source.h"
#include "third_party/blink/renderer/platform/wtf/assertions.h"
namespace blink {
namespace {
void GetSourceSettings(const blink::WebMediaStreamSource& web_source,
blink::WebMediaStreamTrack::Settings& settings) {
blink::MediaStreamAudioSource* const source =
blink::MediaStreamAudioSource::From(web_source);
if (!source)
return;
media::AudioParameters audio_parameters = source->GetAudioParameters();
if (audio_parameters.IsValid()) {
settings.sample_rate = audio_parameters.sample_rate();
settings.channel_count = audio_parameters.channels();
settings.latency = audio_parameters.GetBufferDuration().InSecondsF();
}
// kSampleFormatS16 is the format used for all audio input streams.
settings.sample_size =
media::SampleFormatToBitsPerChannel(media::kSampleFormatS16);
}
} // namespace
MediaStreamSource::MediaStreamSource(const String& id,
StreamType type,
const String& name,
bool remote,
ReadyState ready_state,
bool requires_consumer)
: id_(id),
type_(type),
name_(name),
remote_(remote),
ready_state_(ready_state),
requires_consumer_(requires_consumer) {}
void MediaStreamSource::SetGroupId(const String& group_id) {
group_id_ = group_id;
}
void MediaStreamSource::SetReadyState(ReadyState ready_state) {
if (ready_state_ != kReadyStateEnded && ready_state_ != ready_state) {
ready_state_ = ready_state;
// Observers may dispatch events which create and add new Observers;
// take a snapshot so as to safely iterate.
HeapVector<Member<Observer>> observers;
CopyToVector(observers_, observers);
for (auto observer : observers)
observer->SourceChangedState();
// setReadyState() will be invoked via the MediaStreamComponent::dispose()
// prefinalizer, allocating |observers|. Which means that |observers| will
// live until the next GC (but be unreferenced by other heap objects),
// _but_ it will potentially contain references to Observers that were
// GCed after the MediaStreamComponent prefinalizer had completed.
//
// So, if the next GC is a conservative one _and_ it happens to find
// a reference to |observers| when scanning the stack, we're in trouble
// as it contains references to now-dead objects.
//
// Work around this by explicitly clearing the vector backing store.
//
// TODO(sof): consider adding run-time checks that disallows this kind
// of dead object revivification by default.
for (wtf_size_t i = 0; i < observers.size(); ++i)
observers[i] = nullptr;
}
}
void MediaStreamSource::AddObserver(MediaStreamSource::Observer* observer) {
observers_.insert(observer);
}
void MediaStreamSource::SetAudioProcessingProperties(
EchoCancellationMode echo_cancellation_mode,
bool auto_gain_control,
bool noise_supression) {
echo_cancellation_mode_ = echo_cancellation_mode;
auto_gain_control_ = auto_gain_control;
noise_supression_ = noise_supression;
}
void MediaStreamSource::AddAudioConsumer(AudioDestinationConsumer* consumer) {
DCHECK(requires_consumer_);
MutexLocker locker(audio_consumers_lock_);
audio_consumers_.insert(consumer);
}
bool MediaStreamSource::RemoveAudioConsumer(
AudioDestinationConsumer* consumer) {
DCHECK(requires_consumer_);
MutexLocker locker(audio_consumers_lock_);
auto it = audio_consumers_.find(consumer);
if (it == audio_consumers_.end())
return false;
audio_consumers_.erase(it);
return true;
}
void MediaStreamSource::GetSettings(WebMediaStreamTrack::Settings& settings) {
settings.device_id = Id();
settings.group_id = GroupId();
if (echo_cancellation_mode_) {
switch (*echo_cancellation_mode_) {
case EchoCancellationMode::kDisabled:
settings.echo_cancellation = false;
settings.echo_cancellation_type.Reset();
break;
case EchoCancellationMode::kBrowser:
settings.echo_cancellation = true;
settings.echo_cancellation_type =
WebString::FromASCII(blink::kEchoCancellationTypeBrowser);
break;
case EchoCancellationMode::kAec3:
settings.echo_cancellation = true;
settings.echo_cancellation_type =
WebString::FromASCII(blink::kEchoCancellationTypeAec3);
break;
case EchoCancellationMode::kSystem:
settings.echo_cancellation = true;
settings.echo_cancellation_type =
WebString::FromASCII(blink::kEchoCancellationTypeSystem);
break;
}
}
if (auto_gain_control_)
settings.auto_gain_control = *auto_gain_control_;
if (noise_supression_)
settings.noise_supression = *noise_supression_;
GetSourceSettings(this, settings);
}
void MediaStreamSource::SetAudioFormat(size_t number_of_channels,
float sample_rate) {
DCHECK(requires_consumer_);
MutexLocker locker(audio_consumers_lock_);
for (AudioDestinationConsumer* consumer : audio_consumers_)
consumer->SetFormat(number_of_channels, sample_rate);
}
void MediaStreamSource::ConsumeAudio(AudioBus* bus, size_t number_of_frames) {
DCHECK(requires_consumer_);
MutexLocker locker(audio_consumers_lock_);
for (AudioDestinationConsumer* consumer : audio_consumers_)
consumer->ConsumeAudio(bus, number_of_frames);
}
void MediaStreamSource::Trace(blink::Visitor* visitor) {
visitor->Trace(observers_);
}
void MediaStreamSource::Dispose() {
{
MutexLocker locker(audio_consumers_lock_);
audio_consumers_.clear();
}
platform_source_.reset();
constraints_.Reset();
}
STATIC_ASSERT_ENUM(WebMediaStreamSource::kTypeAudio,
MediaStreamSource::kTypeAudio);
STATIC_ASSERT_ENUM(WebMediaStreamSource::kTypeVideo,
MediaStreamSource::kTypeVideo);
STATIC_ASSERT_ENUM(WebMediaStreamSource::kReadyStateLive,
MediaStreamSource::kReadyStateLive);
STATIC_ASSERT_ENUM(WebMediaStreamSource::kReadyStateMuted,
MediaStreamSource::kReadyStateMuted);
STATIC_ASSERT_ENUM(WebMediaStreamSource::kReadyStateEnded,
MediaStreamSource::kReadyStateEnded);
STATIC_ASSERT_ENUM(WebMediaStreamSource::EchoCancellationMode::kDisabled,
MediaStreamSource::EchoCancellationMode::kDisabled);
STATIC_ASSERT_ENUM(WebMediaStreamSource::EchoCancellationMode::kBrowser,
MediaStreamSource::EchoCancellationMode::kBrowser);
STATIC_ASSERT_ENUM(WebMediaStreamSource::EchoCancellationMode::kAec3,
MediaStreamSource::EchoCancellationMode::kAec3);
STATIC_ASSERT_ENUM(WebMediaStreamSource::EchoCancellationMode::kSystem,
MediaStreamSource::EchoCancellationMode::kSystem);
} // namespace blink
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