mirror of
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123 lines
4.2 KiB
C++
123 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "MediaStreamAudioDestinationNode.h"
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#include "nsIDocument.h"
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#include "mozilla/dom/MediaStreamAudioDestinationNodeBinding.h"
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#include "AudioNodeEngine.h"
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#include "AudioNodeStream.h"
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#include "DOMMediaStream.h"
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#include "TrackUnionStream.h"
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namespace mozilla {
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namespace dom {
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NS_IMPL_CYCLE_COLLECTION_INHERITED(MediaStreamAudioDestinationNode, AudioNode, mDOMStream)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(MediaStreamAudioDestinationNode)
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NS_INTERFACE_MAP_END_INHERITING(AudioNode)
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NS_IMPL_ADDREF_INHERITED(MediaStreamAudioDestinationNode, AudioNode)
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NS_IMPL_RELEASE_INHERITED(MediaStreamAudioDestinationNode, AudioNode)
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static const int MEDIA_STREAM_DEST_TRACK_ID = 2;
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static_assert(MEDIA_STREAM_DEST_TRACK_ID != AudioNodeStream::AUDIO_TRACK,
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"MediaStreamAudioDestinationNode::MEDIA_STREAM_DEST_TRACK_ID must be a different value than AudioNodeStream::AUDIO_TRACK");
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class MediaStreamDestinationEngine : public AudioNodeEngine {
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public:
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MediaStreamDestinationEngine(AudioNode* aNode, ProcessedMediaStream* aOutputStream)
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: AudioNodeEngine(aNode)
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, mOutputStream(aOutputStream)
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{
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MOZ_ASSERT(mOutputStream);
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}
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virtual void ProcessBlock(AudioNodeStream* aStream,
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const AudioChunk& aInput,
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AudioChunk* aOutput,
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bool* aFinished) MOZ_OVERRIDE
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{
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*aOutput = aInput;
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StreamBuffer::Track* track = mOutputStream->EnsureTrack(MEDIA_STREAM_DEST_TRACK_ID,
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aStream->SampleRate());
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AudioSegment* segment = track->Get<AudioSegment>();
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segment->AppendAndConsumeChunk(aOutput);
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}
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virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE
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{
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return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
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}
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private:
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ProcessedMediaStream* mOutputStream;
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};
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// This callback is used to ensure that only the audio data for this track is audible
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static bool FilterAudioNodeStreamTrack(StreamBuffer::Track* aTrack)
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{
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return aTrack->GetID() == MEDIA_STREAM_DEST_TRACK_ID;
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}
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MediaStreamAudioDestinationNode::MediaStreamAudioDestinationNode(AudioContext* aContext)
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: AudioNode(aContext,
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2,
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ChannelCountMode::Explicit,
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ChannelInterpretation::Speakers)
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, mDOMStream(DOMAudioNodeMediaStream::CreateTrackUnionStream(GetOwner(),
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MOZ_THIS_IN_INITIALIZER_LIST(),
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DOMMediaStream::HINT_CONTENTS_AUDIO))
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{
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TrackUnionStream* tus = static_cast<TrackUnionStream*>(mDOMStream->GetStream());
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MOZ_ASSERT(tus == mDOMStream->GetStream()->AsProcessedStream());
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tus->SetTrackIDFilter(FilterAudioNodeStreamTrack);
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MediaStreamDestinationEngine* engine = new MediaStreamDestinationEngine(this, tus);
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mStream = aContext->Graph()->CreateAudioNodeStream(engine, MediaStreamGraph::INTERNAL_STREAM);
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mPort = tus->AllocateInputPort(mStream, 0);
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nsIDocument* doc = aContext->GetParentObject()->GetExtantDoc();
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if (doc) {
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mDOMStream->CombineWithPrincipal(doc->NodePrincipal());
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}
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}
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size_t
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MediaStreamAudioDestinationNode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
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{
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// Future:
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// - mDOMStream
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size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf);
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amount += mPort->SizeOfIncludingThis(aMallocSizeOf);
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return amount;
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}
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size_t
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MediaStreamAudioDestinationNode::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
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{
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return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
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}
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void
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MediaStreamAudioDestinationNode::DestroyMediaStream()
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{
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AudioNode::DestroyMediaStream();
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if (mPort) {
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mPort->Destroy();
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mPort = nullptr;
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}
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}
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JSObject*
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MediaStreamAudioDestinationNode::WrapObject(JSContext* aCx)
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{
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return MediaStreamAudioDestinationNodeBinding::Wrap(aCx, this);
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}
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}
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}
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