The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/content/media/webaudio/MediaStreamAudioDestinationNode.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,122 @@
     1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
     1.5 +/* vim:set ts=2 sw=2 sts=2 et cindent: */
     1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.9 +
    1.10 +#include "MediaStreamAudioDestinationNode.h"
    1.11 +#include "nsIDocument.h"
    1.12 +#include "mozilla/dom/MediaStreamAudioDestinationNodeBinding.h"
    1.13 +#include "AudioNodeEngine.h"
    1.14 +#include "AudioNodeStream.h"
    1.15 +#include "DOMMediaStream.h"
    1.16 +#include "TrackUnionStream.h"
    1.17 +
    1.18 +namespace mozilla {
    1.19 +namespace dom {
    1.20 +
    1.21 +NS_IMPL_CYCLE_COLLECTION_INHERITED(MediaStreamAudioDestinationNode, AudioNode, mDOMStream)
    1.22 +
    1.23 +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(MediaStreamAudioDestinationNode)
    1.24 +NS_INTERFACE_MAP_END_INHERITING(AudioNode)
    1.25 +
    1.26 +NS_IMPL_ADDREF_INHERITED(MediaStreamAudioDestinationNode, AudioNode)
    1.27 +NS_IMPL_RELEASE_INHERITED(MediaStreamAudioDestinationNode, AudioNode)
    1.28 +
    1.29 +static const int MEDIA_STREAM_DEST_TRACK_ID = 2;
    1.30 +static_assert(MEDIA_STREAM_DEST_TRACK_ID != AudioNodeStream::AUDIO_TRACK,
    1.31 +              "MediaStreamAudioDestinationNode::MEDIA_STREAM_DEST_TRACK_ID must be a different value than AudioNodeStream::AUDIO_TRACK");
    1.32 +
    1.33 +class MediaStreamDestinationEngine : public AudioNodeEngine {
    1.34 +public:
    1.35 +  MediaStreamDestinationEngine(AudioNode* aNode, ProcessedMediaStream* aOutputStream)
    1.36 +    : AudioNodeEngine(aNode)
    1.37 +    , mOutputStream(aOutputStream)
    1.38 +  {
    1.39 +    MOZ_ASSERT(mOutputStream);
    1.40 +  }
    1.41 +
    1.42 +  virtual void ProcessBlock(AudioNodeStream* aStream,
    1.43 +                            const AudioChunk& aInput,
    1.44 +                            AudioChunk* aOutput,
    1.45 +                            bool* aFinished) MOZ_OVERRIDE
    1.46 +  {
    1.47 +    *aOutput = aInput;
    1.48 +    StreamBuffer::Track* track = mOutputStream->EnsureTrack(MEDIA_STREAM_DEST_TRACK_ID,
    1.49 +                                                            aStream->SampleRate());
    1.50 +    AudioSegment* segment = track->Get<AudioSegment>();
    1.51 +    segment->AppendAndConsumeChunk(aOutput);
    1.52 +  }
    1.53 +
    1.54 +  virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE
    1.55 +  {
    1.56 +    return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
    1.57 +  }
    1.58 +
    1.59 +private:
    1.60 +  ProcessedMediaStream* mOutputStream;
    1.61 +};
    1.62 +
    1.63 +// This callback is used to ensure that only the audio data for this track is audible
    1.64 +static bool FilterAudioNodeStreamTrack(StreamBuffer::Track* aTrack)
    1.65 +{
    1.66 +  return aTrack->GetID() == MEDIA_STREAM_DEST_TRACK_ID;
    1.67 +}
    1.68 +
    1.69 +MediaStreamAudioDestinationNode::MediaStreamAudioDestinationNode(AudioContext* aContext)
    1.70 +  : AudioNode(aContext,
    1.71 +              2,
    1.72 +              ChannelCountMode::Explicit,
    1.73 +              ChannelInterpretation::Speakers)
    1.74 +  , mDOMStream(DOMAudioNodeMediaStream::CreateTrackUnionStream(GetOwner(),
    1.75 +                                                               MOZ_THIS_IN_INITIALIZER_LIST(),
    1.76 +                                                               DOMMediaStream::HINT_CONTENTS_AUDIO))
    1.77 +{
    1.78 +  TrackUnionStream* tus = static_cast<TrackUnionStream*>(mDOMStream->GetStream());
    1.79 +  MOZ_ASSERT(tus == mDOMStream->GetStream()->AsProcessedStream());
    1.80 +  tus->SetTrackIDFilter(FilterAudioNodeStreamTrack);
    1.81 +
    1.82 +  MediaStreamDestinationEngine* engine = new MediaStreamDestinationEngine(this, tus);
    1.83 +  mStream = aContext->Graph()->CreateAudioNodeStream(engine, MediaStreamGraph::INTERNAL_STREAM);
    1.84 +  mPort = tus->AllocateInputPort(mStream, 0);
    1.85 +
    1.86 +  nsIDocument* doc = aContext->GetParentObject()->GetExtantDoc();
    1.87 +  if (doc) {
    1.88 +    mDOMStream->CombineWithPrincipal(doc->NodePrincipal());
    1.89 +  }
    1.90 +}
    1.91 +
    1.92 +size_t
    1.93 +MediaStreamAudioDestinationNode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
    1.94 +{
    1.95 +  // Future:
    1.96 +  // - mDOMStream
    1.97 +  size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf);
    1.98 +  amount += mPort->SizeOfIncludingThis(aMallocSizeOf);
    1.99 +  return amount;
   1.100 +}
   1.101 +
   1.102 +size_t
   1.103 +MediaStreamAudioDestinationNode::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
   1.104 +{
   1.105 +  return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
   1.106 +}
   1.107 +
   1.108 +void
   1.109 +MediaStreamAudioDestinationNode::DestroyMediaStream()
   1.110 +{
   1.111 +  AudioNode::DestroyMediaStream();
   1.112 +  if (mPort) {
   1.113 +    mPort->Destroy();
   1.114 +    mPort = nullptr;
   1.115 +  }
   1.116 +}
   1.117 +
   1.118 +JSObject*
   1.119 +MediaStreamAudioDestinationNode::WrapObject(JSContext* aCx)
   1.120 +{
   1.121 +  return MediaStreamAudioDestinationNodeBinding::Wrap(aCx, this);
   1.122 +}
   1.123 +
   1.124 +}
   1.125 +}