gecko/content/media/AudioNodeStream.h

85 lines
2.7 KiB
C++

/* -*- 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/AudioParam.h"
#ifdef PR_LOGGING
#define LOG(type, msg) PR_LOG(gMediaStreamGraphLog, type, msg)
#else
#define LOG(type, msg)
#endif
namespace mozilla {
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 };
/**
* Transfers ownership of aEngine to the new AudioNodeStream.
*/
explicit AudioNodeStream(AudioNodeEngine* aEngine)
: ProcessedMediaStream(nullptr), mEngine(aEngine), mLastChunk(nullptr)
{
}
~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 SetBuffer(already_AddRefed<ThreadSharedFloatArrayBufferList> aBuffer);
virtual AudioNodeStream* AsAudioNodeStream() { return this; }
// Graph thread only
void SetStreamTimeParameterImpl(uint32_t aIndex, MediaStream* aRelativeToStream,
double aStreamTime);
virtual void ProduceOutput(GraphTime aFrom, GraphTime aTo);
TrackTicks GetCurrentPosition();
// Any thread
AudioNodeEngine* Engine() { return mEngine; }
protected:
void FinishOutput();
StreamBuffer::Track* EnsureTrack();
AudioChunk* ObtainInputBlock(AudioChunk* aTmpChunk);
// The engine that will generate output for this node.
nsAutoPtr<AudioNodeEngine> mEngine;
// The last block produced by this node.
AudioChunk* mLastChunk;
};
}
#endif /* MOZILLA_AUDIONODESTREAM_H_ */