gecko/content/media/webaudio/AudioParam.h
Ehsan Akhgari 6d64573151 Bug 836076 - Part 3: Make AudioParams call back into their owning node when they're modified; r=roc
We need this in order to update the MediaStreamGraph thread when an
AudioParam changes.  This enables each AudioParam to be registered with
a callback from its owner node, so that the owner node can have custom
processing code for each AudioParam's mutation.
2013-01-28 18:59:29 -05:00

125 lines
3.4 KiB
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/* -*- 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 AudioParam_h_
#define AudioParam_h_
#include "AudioEventTimeline.h"
#include "nsWrapperCache.h"
#include "nsCycleCollectionParticipant.h"
#include "nsCOMPtr.h"
#include "EnableWebAudioCheck.h"
#include "nsAutoPtr.h"
#include "AudioNode.h"
#include "mozilla/dom/TypedArray.h"
#include "mozilla/Util.h"
#include "mozilla/ErrorResult.h"
struct JSContext;
class nsIDOMWindow;
namespace mozilla {
namespace dom {
typedef AudioEventTimeline<ErrorResult> AudioParamTimeline;
class AudioParam MOZ_FINAL : public nsWrapperCache,
public EnableWebAudioCheck,
public AudioParamTimeline
{
public:
typedef void (*CallbackType)(AudioNode*);
AudioParam(AudioNode* aNode,
CallbackType aCallback,
float aDefaultValue,
float aMinValue,
float aMaxValue);
virtual ~AudioParam();
NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(AudioParam)
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(AudioParam)
AudioContext* GetParentObject() const
{
return mNode->Context();
}
virtual JSObject* WrapObject(JSContext* aCx, JSObject* aScope,
bool* aTriedToWrap);
// We override SetValueCurveAtTime to convert the Float32Array to the wrapper
// object.
void SetValueCurveAtTime(JSContext* cx, const Float32Array& aValues, double aStartTime, double aDuration, ErrorResult& aRv)
{
AudioParamTimeline::SetValueCurveAtTime(aValues.Data(), aValues.Length(),
aStartTime, aDuration, aRv);
mCallback(mNode);
}
// We override the rest of the mutating AudioParamTimeline methods in order to make
// sure that the callback is called every time that this object gets mutated.
void SetValue(float aValue)
{
AudioParamTimeline::SetValue(aValue);
mCallback(mNode);
}
void SetValueAtTime(float aValue, double aStartTime, ErrorResult& aRv)
{
AudioParamTimeline::SetValueAtTime(aValue, aStartTime, aRv);
mCallback(mNode);
}
void LinearRampToValueAtTime(float aValue, double aEndTime, ErrorResult& aRv)
{
AudioParamTimeline::LinearRampToValueAtTime(aValue, aEndTime, aRv);
mCallback(mNode);
}
void ExponentialRampToValueAtTime(float aValue, double aEndTime, ErrorResult& aRv)
{
AudioParamTimeline::ExponentialRampToValueAtTime(aValue, aEndTime, aRv);
mCallback(mNode);
}
void SetTargetAtTime(float aTarget, double aStartTime, double aTimeConstant, ErrorResult& aRv)
{
AudioParamTimeline::SetTargetAtTime(aTarget, aStartTime, aTimeConstant, aRv);
mCallback(mNode);
}
void CancelScheduledValues(double aStartTime)
{
AudioParamTimeline::CancelScheduledValues(aStartTime);
mCallback(mNode);
}
float MinValue() const
{
return mMinValue;
}
float MaxValue() const
{
return mMaxValue;
}
float DefaultValue() const
{
return mDefaultValue;
}
private:
nsRefPtr<AudioNode> mNode;
CallbackType mCallback;
const float mDefaultValue;
const float mMinValue;
const float mMaxValue;
};
}
}
#endif