/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim:set ts=2 sw=2 sts=2 et cindent: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "MediaStreamAudioDestinationNode.h"

#include "nsIDocument.h"

#include "mozilla/dom/MediaStreamAudioDestinationNodeBinding.h"

#include "AudioNodeEngine.h"

#include "AudioNodeStream.h"

#include "DOMMediaStream.h"

#include "MediaStreamTrack.h"

#include "TrackUnionStream.h"

namespace mozilla {

namespace dom {

class AudioDestinationTrackSource final :

  public MediaStreamTrackSource

{

public:

  NS_DECL_ISUPPORTS_INHERITED

  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(AudioDestinationTrackSource,

                                           MediaStreamTrackSource)

  AudioDestinationTrackSource(MediaStreamAudioDestinationNode* aNode,

                              nsIPrincipal* aPrincipal)

    : MediaStreamTrackSource(aPrincipal, nsString())

    , mNode(aNode)

  {

  }

  void Destroy() override

  {

    if (mNode) {

      mNode->DestroyMediaStream();

      mNode = nullptr;

    }

  }

  MediaSourceEnum GetMediaSource() const override

  {

    return MediaSourceEnum::AudioCapture;

  }

  void Stop() override

  {

    Destroy();

  }

  void Disable() override

  {

  }

  void Enable() override

  {

  }

private:

  ~AudioDestinationTrackSource() = default;

  RefPtr<MediaStreamAudioDestinationNode> mNode;

};

NS_IMPL_ADDREF_INHERITED(AudioDestinationTrackSource,

                         MediaStreamTrackSource)

NS_IMPL_RELEASE_INHERITED(AudioDestinationTrackSource,

                          MediaStreamTrackSource)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(AudioDestinationTrackSource)

NS_INTERFACE_MAP_END_INHERITING(MediaStreamTrackSource)

NS_IMPL_CYCLE_COLLECTION_INHERITED(AudioDestinationTrackSource,

                                   MediaStreamTrackSource,

                                   mNode)

NS_IMPL_CYCLE_COLLECTION_INHERITED(MediaStreamAudioDestinationNode, AudioNode, mDOMStream)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaStreamAudioDestinationNode)

NS_INTERFACE_MAP_END_INHERITING(AudioNode)

NS_IMPL_ADDREF_INHERITED(MediaStreamAudioDestinationNode, AudioNode)

NS_IMPL_RELEASE_INHERITED(MediaStreamAudioDestinationNode, AudioNode)

MediaStreamAudioDestinationNode::MediaStreamAudioDestinationNode(AudioContext* aContext)

  : AudioNode(aContext,

              2,

              ChannelCountMode::Explicit,

              ChannelInterpretation::Speakers)

  , mDOMStream(

      DOMAudioNodeMediaStream::CreateTrackUnionStreamAsInput(GetOwner(),

                                                             this,

                                                             aContext->Graph()))

{

  // Ensure an audio track with the correct ID is exposed to JS

  nsIDocument* doc = aContext->GetParentObject()->GetExtantDoc();

  RefPtr<MediaStreamTrackSource> source =

    new AudioDestinationTrackSource(this, doc->NodePrincipal());

  RefPtr<MediaStreamTrack> track =

    mDOMStream->CreateDOMTrack(AudioNodeStream::AUDIO_TRACK,

                               MediaSegment::AUDIO, source,

                               MediaTrackConstraints());

  mDOMStream->AddTrackInternal(track);

  ProcessedMediaStream* outputStream = mDOMStream->GetInputStream()->AsProcessedStream();

  MOZ_ASSERT(!!outputStream);

  AudioNodeEngine* engine = new AudioNodeEngine(this);

  mStream = AudioNodeStream::Create(aContext, engine,

                                    AudioNodeStream::EXTERNAL_OUTPUT,

                                    aContext->Graph());

  mPort = outputStream->AllocateInputPort(mStream, AudioNodeStream::AUDIO_TRACK);

}

/* static */ already_AddRefed<MediaStreamAudioDestinationNode>

MediaStreamAudioDestinationNode::Create(AudioContext& aAudioContext,

                                        const AudioNodeOptions& aOptions,

                                        ErrorResult& aRv)

{

  if (aAudioContext.IsOffline()) {

    aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);

    return nullptr;

  }

  if (aAudioContext.CheckClosed(aRv)) {

    return nullptr;

  }

  RefPtr<MediaStreamAudioDestinationNode> audioNode =

    new MediaStreamAudioDestinationNode(&aAudioContext);

  audioNode->Initialize(aOptions, aRv);

  if (NS_WARN_IF(aRv.Failed())) {

    return nullptr;

  }

  return audioNode.forget();

}

size_t

MediaStreamAudioDestinationNode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const

{

  // Future:

  // - mDOMStream

  size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf);

  amount += mPort->SizeOfIncludingThis(aMallocSizeOf);

  return amount;

}

size_t

MediaStreamAudioDestinationNode::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const

{

  return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);

}

void

MediaStreamAudioDestinationNode::DestroyMediaStream()

{

  AudioNode::DestroyMediaStream();

  if (mPort) {

    mPort->Destroy();

    mPort = nullptr;

  }

}

JSObject*

MediaStreamAudioDestinationNode::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)

{

  return MediaStreamAudioDestinationNode_Binding::Wrap(aCx, this, aGivenProto);

}

} // namespace dom

} // namespace mozilla