gecko-dev/content/media/webaudio/DelayNode.h

64 lines
1.7 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 DelayNode_h_
#define DelayNode_h_
#include "AudioNode.h"
#include "AudioParam.h"
namespace mozilla {
namespace dom {
class AudioContext;
template <class T> class PlayingRefChangeHandler;
class DelayNode : public AudioNode
{
public:
DelayNode(AudioContext* aContext, double aMaxDelay);
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(DelayNode, AudioNode)
virtual JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aScope) MOZ_OVERRIDE;
AudioParam* DelayTime() const
{
return mDelay;
}
virtual void NotifyInputConnected() MOZ_OVERRIDE
{
mMediaStreamGraphUpdateIndexAtLastInputConnection =
mStream->Graph()->GetCurrentGraphUpdateIndex();
}
bool AcceptPlayingRefRelease(int64_t aLastGraphUpdateIndexProcessed) const
{
// Reject any requests to release mPlayingRef if the request was issued
// before the MediaStreamGraph was aware of the most-recently-added input
// connection.
return aLastGraphUpdateIndexProcessed >= mMediaStreamGraphUpdateIndexAtLastInputConnection;
}
private:
static void SendDelayToStream(AudioNode* aNode);
friend class DelayNodeEngine;
friend class PlayingRefChangeHandler<DelayNode>;
private:
int64_t mMediaStreamGraphUpdateIndexAtLastInputConnection;
nsRefPtr<AudioParam> mDelay;
SelfReference<DelayNode> mPlayingRef;
};
}
}
#endif