third_party/WebKit/Source/platform/exported/WebMediaStreamSource.cpp

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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 * in the documentation and/or other materials provided with the
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "public/platform/WebMediaStreamSource.h"

#include <memory>
#include <utility>

#include "platform/audio/AudioBus.h"
#include "platform/mediastream/MediaStreamSource.h"
#include "platform/wtf/PtrUtil.h"
#include "platform/wtf/Vector.h"
#include "public/platform/WebAudioDestinationConsumer.h"
#include "public/platform/WebMediaConstraints.h"
#include "public/platform/WebString.h"

namespace blink {

namespace {

class MediaStreamSourceExtraDataContainer
    : public MediaStreamSource::ExtraData {
 public:
  MediaStreamSourceExtraDataContainer(
      std::unique_ptr<WebMediaStreamSource::ExtraData> extra_data)
      : extra_data_(std::move(extra_data)) {}

  WebMediaStreamSource::ExtraData* GetExtraData() { return extra_data_.get(); }

 private:
  std::unique_ptr<WebMediaStreamSource::ExtraData> extra_data_;
};

}  // namespace

WebMediaStreamSource WebMediaStreamSource::ExtraData::Owner() {
  DCHECK(owner_);
  return WebMediaStreamSource(owner_);
}

void WebMediaStreamSource::ExtraData::SetOwner(MediaStreamSource* owner) {
  DCHECK(!owner_);
  owner_ = owner;
}

WebMediaStreamSource::WebMediaStreamSource(
    MediaStreamSource* media_stream_source)
    : private_(media_stream_source) {}

WebMediaStreamSource& WebMediaStreamSource::operator=(
    MediaStreamSource* media_stream_source) {
  private_ = media_stream_source;
  return *this;
}

void WebMediaStreamSource::Assign(const WebMediaStreamSource& other) {
  private_ = other.private_;
}

void WebMediaStreamSource::Reset() {
  private_.Reset();
}

WebMediaStreamSource::operator MediaStreamSource*() const {
  return private_.Get();
}

void WebMediaStreamSource::Initialize(const WebString& id,
                                      Type type,
                                      const WebString& name) {
  private_ = MediaStreamSource::Create(
      id, static_cast<MediaStreamSource::StreamType>(type), name, false);
}

void WebMediaStreamSource::Initialize(const WebString& id,
                                      Type type,
                                      const WebString& name,
                                      bool remote) {
  private_ = MediaStreamSource::Create(
      id, static_cast<MediaStreamSource::StreamType>(type), name, remote);
}

WebString WebMediaStreamSource::Id() const {
  DCHECK(!private_.IsNull());
  return private_.Get()->Id();
}

WebMediaStreamSource::Type WebMediaStreamSource::GetType() const {
  DCHECK(!private_.IsNull());
  return static_cast<Type>(private_.Get()->GetType());
}

WebString WebMediaStreamSource::GetName() const {
  DCHECK(!private_.IsNull());
  return private_.Get()->GetName();
}

bool WebMediaStreamSource::Remote() const {
  DCHECK(!private_.IsNull());
  return private_.Get()->Remote();
}

void WebMediaStreamSource::SetReadyState(ReadyState state) {
  DCHECK(!private_.IsNull());
  private_->SetReadyState(static_cast<MediaStreamSource::ReadyState>(state));
}

WebMediaStreamSource::ReadyState WebMediaStreamSource::GetReadyState() const {
  DCHECK(!private_.IsNull());
  return static_cast<ReadyState>(private_->GetReadyState());
}

WebMediaStreamSource::ExtraData* WebMediaStreamSource::GetExtraData() const {
  DCHECK(!private_.IsNull());
  MediaStreamSource::ExtraData* data = private_->GetExtraData();
  if (!data)
    return nullptr;
  return static_cast<MediaStreamSourceExtraDataContainer*>(data)
      ->GetExtraData();
}

void WebMediaStreamSource::SetExtraData(ExtraData* extra_data) {
  DCHECK(!private_.IsNull());

  if (extra_data)
    extra_data->SetOwner(private_.Get());

  private_->SetExtraData(WTF::WrapUnique(
      new MediaStreamSourceExtraDataContainer(WTF::WrapUnique(extra_data))));
}

void WebMediaStreamSource::SetEchoCancellation(bool echo_cancellation) {
  DCHECK(!private_.IsNull());
  private_->SetEchoCancellation(echo_cancellation);
}

WebMediaConstraints WebMediaStreamSource::Constraints() {
  DCHECK(!private_.IsNull());
  return private_->Constraints();
}

void WebMediaStreamSource::SetCapabilities(
    const WebMediaStreamSource::Capabilities& capabilities) {
  DCHECK(!private_.IsNull());
  private_->SetCapabilities(capabilities);
}

bool WebMediaStreamSource::RequiresAudioConsumer() const {
  DCHECK(!private_.IsNull());
  return private_->RequiresAudioConsumer();
}

class ConsumerWrapper final : public AudioDestinationConsumer {
  USING_FAST_MALLOC(ConsumerWrapper);

 public:
  static ConsumerWrapper* Create(WebAudioDestinationConsumer* consumer) {
    return new ConsumerWrapper(consumer);
  }

  void SetFormat(size_t number_of_channels, float sample_rate) override;
  void ConsumeAudio(AudioBus*, size_t number_of_frames) override;

  WebAudioDestinationConsumer* Consumer() { return consumer_; }

 private:
  explicit ConsumerWrapper(WebAudioDestinationConsumer* consumer)
      : consumer_(consumer) {}

  // m_consumer is not owned by this class.
  WebAudioDestinationConsumer* consumer_;
};

void ConsumerWrapper::SetFormat(size_t number_of_channels, float sample_rate) {
  consumer_->SetFormat(number_of_channels, sample_rate);
}

void ConsumerWrapper::ConsumeAudio(AudioBus* bus, size_t number_of_frames) {
  if (!bus)
    return;

  // Wrap AudioBus.
  size_t number_of_channels = bus->NumberOfChannels();
  WebVector<const float*> bus_vector(number_of_channels);
  for (size_t i = 0; i < number_of_channels; ++i)
    bus_vector[i] = bus->Channel(i)->Data();

  consumer_->ConsumeAudio(bus_vector, number_of_frames);
}

void WebMediaStreamSource::AddAudioConsumer(
    WebAudioDestinationConsumer* consumer) {
  DCHECK(IsMainThread());
  DCHECK(!private_.IsNull() && consumer);

  private_->AddAudioConsumer(ConsumerWrapper::Create(consumer));
}

bool WebMediaStreamSource::RemoveAudioConsumer(
    WebAudioDestinationConsumer* consumer) {
  DCHECK(IsMainThread());
  DCHECK(!private_.IsNull() && consumer);

  const HashSet<AudioDestinationConsumer*>& consumers =
      private_->AudioConsumers();
  for (AudioDestinationConsumer* it : consumers) {
    ConsumerWrapper* wrapper = static_cast<ConsumerWrapper*>(it);
    if (wrapper->Consumer() == consumer) {
      private_->RemoveAudioConsumer(wrapper);
      return true;
    }
  }
  return false;
}

}  // namespace blink