third_party/WebKit/Source/platform/mediastream/MediaStreamSource.cpp

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
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 * 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.
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 *    notice, this list of conditions and the following disclaimer
 *    in the documentation and/or other materials provided with the
 *    distribution.
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 *    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,
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#include "platform/mediastream/MediaStreamSource.h"

namespace blink {

MediaStreamSource* MediaStreamSource::create(const String& id,
                                             StreamType type,
                                             const String& name,
                                             ReadyState readyState,
                                             bool requiresConsumer) {
  return new MediaStreamSource(id, type, name, readyState, requiresConsumer);
}

MediaStreamSource::MediaStreamSource(const String& id,
                                     StreamType type,
                                     const String& name,
                                     ReadyState readyState,
                                     bool requiresConsumer)
    : m_id(id),
      m_type(type),
      m_name(name),
      m_readyState(readyState),
      m_requiresConsumer(requiresConsumer) {}

MediaStreamSource::~MediaStreamSource() {
  // Verify that the audio thread isn't consuming audio.
  // TODO(sof): remove once crbug.com/682945 has been diagnosed.
  MutexTryLocker tryLocker(m_audioConsumersLock);
  CHECK(tryLocker.locked());
}

void MediaStreamSource::setReadyState(ReadyState readyState) {
  if (m_readyState != ReadyStateEnded && m_readyState != readyState) {
    m_readyState = readyState;

    // Observers may dispatch events which create and add new Observers;
    // take a snapshot so as to safely iterate.
    HeapVector<Member<Observer>> observers;
    copyToVector(m_observers, observers);
    for (auto observer : observers)
      observer->sourceChangedState();
  }
}

void MediaStreamSource::addObserver(MediaStreamSource::Observer* observer) {
  m_observers.insert(observer);
}

void MediaStreamSource::addAudioConsumer(AudioDestinationConsumer* consumer) {
  ASSERT(m_requiresConsumer);
  MutexLocker locker(m_audioConsumersLock);
  m_audioConsumers.insert(consumer);
}

bool MediaStreamSource::removeAudioConsumer(
    AudioDestinationConsumer* consumer) {
  ASSERT(m_requiresConsumer);
  MutexLocker locker(m_audioConsumersLock);
  HeapHashSet<Member<AudioDestinationConsumer>>::iterator it =
      m_audioConsumers.find(consumer);
  if (it == m_audioConsumers.end())
    return false;
  m_audioConsumers.erase(it);
  return true;
}

void MediaStreamSource::getSettings(WebMediaStreamTrack::Settings& settings) {
  settings.deviceId = id();
}

void MediaStreamSource::setAudioFormat(size_t numberOfChannels,
                                       float sampleRate) {
  ASSERT(m_requiresConsumer);
  MutexLocker locker(m_audioConsumersLock);
  for (HeapHashSet<Member<AudioDestinationConsumer>>::iterator it =
           m_audioConsumers.begin();
       it != m_audioConsumers.end(); ++it)
    (*it)->setFormat(numberOfChannels, sampleRate);
}

void MediaStreamSource::consumeAudio(AudioBus* bus, size_t numberOfFrames) {
  ASSERT(m_requiresConsumer);
  MutexLocker locker(m_audioConsumersLock);
  for (HeapHashSet<Member<AudioDestinationConsumer>>::iterator it =
           m_audioConsumers.begin();
       it != m_audioConsumers.end(); ++it)
    (*it)->consumeAudio(bus, numberOfFrames);
}

DEFINE_TRACE(MediaStreamSource) {
  visitor->trace(m_observers);
  visitor->trace(m_audioConsumers);
}

}  // namespace blink