gecko-dev/content/media/webaudio/AudioBufferSourceNode.h
2013-06-08 00:55:04 +05:30

155 lines
3.8 KiB
C++

/* -*- 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/. */
#ifndef AudioBufferSourceNode_h_
#define AudioBufferSourceNode_h_
#include "AudioNode.h"
#include "AudioBuffer.h"
#include "AudioParam.h"
#include "mozilla/dom/BindingUtils.h"
namespace mozilla {
namespace dom {
class AudioBufferSourceNode : public AudioNode,
public MainThreadMediaStreamListener
{
public:
explicit AudioBufferSourceNode(AudioContext* aContext);
virtual ~AudioBufferSourceNode();
virtual void DestroyMediaStream() MOZ_OVERRIDE
{
if (mStream) {
mStream->RemoveMainThreadListener(this);
}
AudioNode::DestroyMediaStream();
}
virtual uint16_t NumberOfInputs() const MOZ_FINAL MOZ_OVERRIDE
{
return 0;
}
virtual AudioBufferSourceNode* AsAudioBufferSourceNode() MOZ_OVERRIDE
{
return this;
}
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(AudioBufferSourceNode, AudioNode)
virtual JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aScope) MOZ_OVERRIDE;
void Start(double aWhen, double aOffset,
const Optional<double>& aDuration, ErrorResult& aRv);
void NoteOn(double aWhen, ErrorResult& aRv)
{
Start(aWhen, 0.0, Optional<double>(), aRv);
}
void NoteGrainOn(double aWhen, double aOffset,
double aDuration, ErrorResult& aRv)
{
Optional<double> duration;
duration.Construct(aDuration);
Start(aWhen, aOffset, duration, aRv);
}
void Stop(double aWhen, ErrorResult& aRv, bool aShuttingDown = false);
void NoteOff(double aWhen, ErrorResult& aRv)
{
Stop(aWhen, aRv);
}
AudioBuffer* GetBuffer(JSContext* aCx) const
{
return mBuffer;
}
void SetBuffer(JSContext* aCx, AudioBuffer* aBuffer)
{
mBuffer = aBuffer;
SendBufferParameterToStream(aCx);
SendLoopParametersToStream();
}
AudioParam* PlaybackRate() const
{
return mPlaybackRate;
}
bool Loop() const
{
return mLoop;
}
void SetLoop(bool aLoop)
{
mLoop = aLoop;
SendLoopParametersToStream();
}
double LoopStart() const
{
return mLoopStart;
}
void SetLoopStart(double aStart)
{
mLoopStart = aStart;
SendLoopParametersToStream();
}
double LoopEnd() const
{
return mLoopEnd;
}
void SetLoopEnd(double aEnd)
{
mLoopEnd = aEnd;
SendLoopParametersToStream();
}
void SendDopplerShiftToStream(double aDopplerShift);
IMPL_EVENT_HANDLER(ended)
virtual void NotifyMainThreadStateChanged() MOZ_OVERRIDE;
private:
friend class AudioBufferSourceNodeEngine;
// START, OFFSET and DURATION are always set by start() (along with setting
// mBuffer to something non-null).
// STOP is set by stop().
enum EngineParameters {
SAMPLE_RATE,
START,
STOP,
OFFSET,
DURATION,
LOOP,
LOOPSTART,
LOOPEND,
PLAYBACKRATE,
DOPPLERSHIFT
};
void SendLoopParametersToStream();
void SendBufferParameterToStream(JSContext* aCx);
void SendOffsetAndDurationParametersToStream(AudioNodeStream* aStream,
double aOffset,
double aDuration);
static void SendPlaybackRateToStream(AudioNode* aNode);
private:
double mLoopStart;
double mLoopEnd;
double mOffset;
double mDuration;
nsRefPtr<AudioBuffer> mBuffer;
nsRefPtr<AudioParam> mPlaybackRate;
SelfReference<AudioBufferSourceNode> mPlayingRef; // a reference to self while playing
bool mLoop;
bool mStartCalled;
bool mStopped;
};
}
}
#endif