gecko/content/media/AudioNodeStream.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
/* 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/. */
#ifndef MOZILLA_AUDIONODESTREAM_H_
#define MOZILLA_AUDIONODESTREAM_H_
#include "MediaStreamGraph.h"
#include "AudioChannelFormat.h"
#include "AudioNodeEngine.h"
#include "mozilla/dom/AudioNodeBinding.h"
#include "mozilla/dom/AudioParam.h"
#ifdef PR_LOGGING
#define LOG(type, msg) PR_LOG(gMediaStreamGraphLog, type, msg)
#else
#define LOG(type, msg)
#endif
namespace mozilla {
namespace dom {
struct ThreeDPoint;
class AudioParamTimeline;
}
class ThreadSharedFloatArrayBufferList;
/**
* An AudioNodeStream produces one audio track with ID AUDIO_TRACK.
* The start time of the AudioTrack is aligned to the start time of the
* AudioContext's destination node stream, plus some multiple of BLOCK_SIZE
* samples.
*
* An AudioNodeStream has an AudioNodeEngine plugged into it that does the
* actual audio processing. AudioNodeStream contains the glue code that
* integrates audio processing with the MediaStreamGraph.
*/
class AudioNodeStream : public ProcessedMediaStream {
public:
enum { AUDIO_TRACK = 1 };
typedef nsAutoTArray<AudioChunk, 1> OutputChunks;
/**
* Transfers ownership of aEngine to the new AudioNodeStream.
*/
AudioNodeStream(AudioNodeEngine* aEngine,
MediaStreamGraph::AudioNodeStreamKind aKind,
TrackRate aSampleRate)
: ProcessedMediaStream(nullptr),
mEngine(aEngine),
mSampleRate(aSampleRate),
mKind(aKind),
mNumberOfInputChannels(2),
mMarkAsFinishedAfterThisBlock(false),
mAudioParamStream(false)
{
MOZ_ASSERT(NS_IsMainThread());
mChannelCountMode = dom::ChannelCountMode::Max;
mChannelInterpretation = dom::ChannelInterpretation::Speakers;
// AudioNodes are always producing data
mHasCurrentData = true;
MOZ_COUNT_CTOR(AudioNodeStream);
}
~AudioNodeStream();
// Control API
/**
* Sets a parameter that's a time relative to some stream's played time.
* This time is converted to a time relative to this stream when it's set.
*/
void SetStreamTimeParameter(uint32_t aIndex, MediaStream* aRelativeToStream,
double aStreamTime);
void SetDoubleParameter(uint32_t aIndex, double aValue);
void SetInt32Parameter(uint32_t aIndex, int32_t aValue);
void SetTimelineParameter(uint32_t aIndex, const dom::AudioParamTimeline& aValue);
void SetThreeDPointParameter(uint32_t aIndex, const dom::ThreeDPoint& aValue);
void SetBuffer(already_AddRefed<ThreadSharedFloatArrayBufferList> aBuffer);
// This consumes the contents of aData. aData will be emptied after this returns.
void SetRawArrayData(nsTArray<float>& aData);
void SetChannelMixingParameters(uint32_t aNumberOfChannels,
dom::ChannelCountMode aChannelCountMoe,
dom::ChannelInterpretation aChannelInterpretation);
void SetAudioParamHelperStream()
{
MOZ_ASSERT(!mAudioParamStream, "Can only do this once");
mAudioParamStream = true;
}
virtual AudioNodeStream* AsAudioNodeStream() { return this; }
// Graph thread only
void SetStreamTimeParameterImpl(uint32_t aIndex, MediaStream* aRelativeToStream,
double aStreamTime);
void SetChannelMixingParametersImpl(uint32_t aNumberOfChannels,
dom::ChannelCountMode aChannelCountMoe,
dom::ChannelInterpretation aChannelInterpretation);
virtual void ProduceOutput(GraphTime aFrom, GraphTime aTo);
TrackTicks GetCurrentPosition();
bool AllInputsFinished() const;
bool IsAudioParamStream() const
{
return mAudioParamStream;
}
const OutputChunks& LastChunks() const
{
return mLastChunks;
}
virtual bool MainThreadNeedsUpdates() const MOZ_OVERRIDE
{
// Only source and external streams need updates on the main thread.
return (mKind == MediaStreamGraph::SOURCE_STREAM && mFinished) ||
mKind == MediaStreamGraph::EXTERNAL_STREAM;
}
// Any thread
AudioNodeEngine* Engine() { return mEngine; }
TrackRate SampleRate() const { return mSampleRate; }
protected:
void FinishOutput();
void ObtainInputBlock(AudioChunk& aTmpChunk, uint32_t aPortIndex);
// The engine that will generate output for this node.
nsAutoPtr<AudioNodeEngine> mEngine;
// The last block produced by this node.
OutputChunks mLastChunks;
// The stream's sampling rate
const TrackRate mSampleRate;
// Whether this is an internal or external stream
MediaStreamGraph::AudioNodeStreamKind mKind;
// The number of input channels that this stream requires. 0 means don't care.
uint32_t mNumberOfInputChannels;
// The mixing modes
dom::ChannelCountMode mChannelCountMode;
dom::ChannelInterpretation mChannelInterpretation;
// Whether the stream should be marked as finished as soon
// as the current time range has been computed block by block.
bool mMarkAsFinishedAfterThisBlock;
// Whether the stream is an AudioParamHelper stream.
bool mAudioParamStream;
};
}
#endif /* MOZILLA_AUDIONODESTREAM_H_ */