<reponame>xzhan96/chromium.src
/*
 * Copyright (C) 2011 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * 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.
 *     * 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,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "public/platform/WebMediaStreamSource.h"

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

namespace blink {

namespace {

class ExtraDataContainer : public MediaStreamSource::ExtraData {
 public:
  ExtraDataContainer(std::unique_ptr<WebMediaStreamSource::ExtraData> extraData)
      : m_extraData(std::move(extraData)) {}

  WebMediaStreamSource::ExtraData* getExtraData() { return m_extraData.get(); }

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

}  // namespace

WebMediaStreamSource WebMediaStreamSource::ExtraData::owner() {
  ASSERT(m_owner);
  return WebMediaStreamSource(m_owner);
}

void WebMediaStreamSource::ExtraData::setOwner(MediaStreamSource* owner) {
  ASSERT(!m_owner);
  m_owner = owner;
}

WebMediaStreamSource::WebMediaStreamSource(MediaStreamSource* mediaStreamSource)
    : m_private(mediaStreamSource) {}

WebMediaStreamSource& WebMediaStreamSource::operator=(
    MediaStreamSource* mediaStreamSource) {
  m_private = mediaStreamSource;
  return *this;
}

void WebMediaStreamSource::assign(const WebMediaStreamSource& other) {
  m_private = other.m_private;
}

void WebMediaStreamSource::reset() {
  m_private.reset();
}

WebMediaStreamSource::operator MediaStreamSource*() const {
  return m_private.get();
}

void WebMediaStreamSource::initialize(const WebString& id,
                                      Type type,
                                      const WebString& name) {
  m_private = MediaStreamSource::create(
      id, static_cast<MediaStreamSource::StreamType>(type), name, false);
}

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

WebString WebMediaStreamSource::id() const {
  ASSERT(!m_private.isNull());
  return m_private.get()->id();
}

WebMediaStreamSource::Type WebMediaStreamSource::getType() const {
  ASSERT(!m_private.isNull());
  return static_cast<Type>(m_private.get()->type());
}

WebString WebMediaStreamSource::name() const {
  ASSERT(!m_private.isNull());
  return m_private.get()->name();
}

bool WebMediaStreamSource::remote() const {
  ASSERT(!m_private.isNull());
  return m_private.get()->remote();
}

void WebMediaStreamSource::setReadyState(ReadyState state) {
  ASSERT(!m_private.isNull());
  m_private->setReadyState(static_cast<MediaStreamSource::ReadyState>(state));
}

WebMediaStreamSource::ReadyState WebMediaStreamSource::getReadyState() const {
  ASSERT(!m_private.isNull());
  return static_cast<ReadyState>(m_private->getReadyState());
}

WebMediaStreamSource::ExtraData* WebMediaStreamSource::getExtraData() const {
  ASSERT(!m_private.isNull());
  MediaStreamSource::ExtraData* data = m_private->getExtraData();
  if (!data)
    return 0;
  return static_cast<ExtraDataContainer*>(data)->getExtraData();
}

void WebMediaStreamSource::setExtraData(ExtraData* extraData) {
  ASSERT(!m_private.isNull());

  if (extraData)
    extraData->setOwner(m_private.get());

  m_private->setExtraData(
      wrapUnique(new ExtraDataContainer(wrapUnique(extraData))));
}

WebMediaConstraints WebMediaStreamSource::constraints() {
  ASSERT(!m_private.isNull());
  return m_private->constraints();
}

bool WebMediaStreamSource::requiresAudioConsumer() const {
  ASSERT(!m_private.isNull());
  return m_private->requiresAudioConsumer();
}

class ConsumerWrapper final : public AudioDestinationConsumer {
 public:
  static ConsumerWrapper* create(WebAudioDestinationConsumer* consumer) {
    return new ConsumerWrapper(consumer);
  }

  void setFormat(size_t numberOfChannels, float sampleRate) override;
  void consumeAudio(AudioBus*, size_t numberOfFrames) override;

  WebAudioDestinationConsumer* consumer() { return m_consumer; }

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

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

void ConsumerWrapper::setFormat(size_t numberOfChannels, float sampleRate) {
  m_consumer->setFormat(numberOfChannels, sampleRate);
}

void ConsumerWrapper::consumeAudio(AudioBus* bus, size_t numberOfFrames) {
  if (!bus)
    return;

  // Wrap AudioBus.
  size_t numberOfChannels = bus->numberOfChannels();
  WebVector<const float*> busVector(numberOfChannels);
  for (size_t i = 0; i < numberOfChannels; ++i)
    busVector[i] = bus->channel(i)->data();

  m_consumer->consumeAudio(busVector, numberOfFrames);
}

void WebMediaStreamSource::addAudioConsumer(
    WebAudioDestinationConsumer* consumer) {
  ASSERT(isMainThread());
  ASSERT(!m_private.isNull() && consumer);

  m_private->addAudioConsumer(ConsumerWrapper::create(consumer));
}

bool WebMediaStreamSource::removeAudioConsumer(
    WebAudioDestinationConsumer* consumer) {
  ASSERT(isMainThread());
  ASSERT(!m_private.isNull() && consumer);

  const HeapHashSet<Member<AudioDestinationConsumer>>& consumers =
      m_private->audioConsumers();
  for (HeapHashSet<Member<AudioDestinationConsumer>>::const_iterator it =
           consumers.begin();
       it != consumers.end(); ++it) {
    ConsumerWrapper* wrapper = static_cast<ConsumerWrapper*>(it->get());
    if (wrapper->consumer() == consumer) {
      m_private->removeAudioConsumer(wrapper);
      return true;
    }
  }
  return false;
}

}  // namespace blink
