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

/*
 * Copyright (C) 2011 Ericsson AB. All rights reserved.
 * Copyright (C) 2013 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:
 *
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 * notice, this list of conditions and the following disclaimer.
 *     * 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.
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 * 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
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#include "platform/mediastream/MediaStreamComponent.h"

#include "platform/UUID.h"
#include "platform/audio/AudioBus.h"
#include "platform/mediastream/MediaStreamCenter.h"
#include "platform/mediastream/MediaStreamSource.h"
#include "public/platform/WebAudioSourceProvider.h"
#include "public/platform/WebMediaStreamTrack.h"

namespace blink {

MediaStreamComponent* MediaStreamComponent::create(MediaStreamSource* source) {
  return new MediaStreamComponent(createCanonicalUUIDString(), source);
}

MediaStreamComponent* MediaStreamComponent::create(const String& id,
                                                   MediaStreamSource* source) {
  return new MediaStreamComponent(id, source);
}

MediaStreamComponent::MediaStreamComponent(const String& id,
                                           MediaStreamSource* source)
    : MediaStreamComponent(id,
                           source,
                           true,
                           false,
                           WebMediaStreamTrack::ContentHintType::None) {}

MediaStreamComponent::MediaStreamComponent(
    const String& id,
    MediaStreamSource* source,
    bool enabled,
    bool muted,
    WebMediaStreamTrack::ContentHintType contentHint)
    : m_source(source),
      m_id(id),
      m_enabled(enabled),
      m_muted(muted),
      m_contentHint(contentHint) {
  DCHECK(m_id.length());
}

MediaStreamComponent* MediaStreamComponent::clone() const {
  MediaStreamComponent* clonedComponent = new MediaStreamComponent(
      createCanonicalUUIDString(), source(), m_enabled, m_muted, m_contentHint);
  // TODO(pbos): Clone |m_trackData| as well.
  // TODO(pbos): Move properties from MediaStreamTrack here so that they are
  // also cloned. Part of crbug:669212 since stopped is currently not carried
  // over, nor is ended().
  return clonedComponent;
}

void MediaStreamComponent::dispose() {
  m_trackData.reset();
}

void MediaStreamComponent::AudioSourceProviderImpl::wrap(
    WebAudioSourceProvider* provider) {
  MutexLocker locker(m_provideInputLock);
  m_webAudioSourceProvider = provider;
}

void MediaStreamComponent::getSettings(
    WebMediaStreamTrack::Settings& settings) {
  DCHECK(m_trackData);
  m_source->getSettings(settings);
  m_trackData->getSettings(settings);
}

void MediaStreamComponent::setContentHint(
    WebMediaStreamTrack::ContentHintType hint) {
  switch (hint) {
    case WebMediaStreamTrack::ContentHintType::None:
      break;
    case WebMediaStreamTrack::ContentHintType::AudioSpeech:
    case WebMediaStreamTrack::ContentHintType::AudioMusic:
      DCHECK_EQ(MediaStreamSource::TypeAudio, source()->type());
      break;
    case WebMediaStreamTrack::ContentHintType::VideoMotion:
    case WebMediaStreamTrack::ContentHintType::VideoDetail:
      DCHECK_EQ(MediaStreamSource::TypeVideo, source()->type());
      break;
  }
  if (hint == m_contentHint)
    return;
  m_contentHint = hint;

  MediaStreamCenter::instance().didSetContentHint(this);
}

void MediaStreamComponent::AudioSourceProviderImpl::provideInput(
    AudioBus* bus,
    size_t framesToProcess) {
  DCHECK(bus);
  if (!bus)
    return;

  MutexTryLocker tryLocker(m_provideInputLock);
  if (!tryLocker.locked() || !m_webAudioSourceProvider) {
    bus->zero();
    return;
  }

  // Wrap the AudioBus channel data using WebVector.
  size_t n = bus->numberOfChannels();
  WebVector<float*> webAudioData(n);
  for (size_t i = 0; i < n; ++i)
    webAudioData[i] = bus->channel(i)->mutableData();

  m_webAudioSourceProvider->provideInput(webAudioData, framesToProcess);
}

DEFINE_TRACE(MediaStreamComponent) {
  visitor->trace(m_source);
}

}  // namespace blink