text: /*
   * 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,
   * 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 "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
  