gecko/content/media/webaudio/AudioParam.h

120 lines
2.8 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 AudioParam_h_
#define AudioParam_h_
#include "AudioEventTimeline.h"
#include "nsWrapperCache.h"
#include "nsCycleCollectionParticipant.h"
#include "nsCOMPtr.h"
#include "EnableWebAudioCheck.h"
#include "nsAutoPtr.h"
#include "AudioContext.h"
#include "mozilla/dom/TypedArray.h"
#include "mozilla/Util.h"
struct JSContext;
class nsIDOMWindow;
namespace mozilla {
class ErrorResult;
namespace dom {
namespace detail {
// This class wraps a JS typed array so that AudioEventTimeline does not need
// to know about JSObjects directly.
class FloatArrayWrapper
{
public:
FloatArrayWrapper() // creates an uninitialized object
{
}
FloatArrayWrapper(const Float32Array& array)
{
mArray.construct(array);
}
FloatArrayWrapper(const FloatArrayWrapper& rhs)
{
MOZ_ASSERT(!rhs.mArray.empty());
mArray.construct(rhs.mArray.ref());
}
FloatArrayWrapper& operator=(const FloatArrayWrapper& rhs)
{
MOZ_ASSERT(!rhs.mArray.empty());
mArray.destroyIfConstructed();
mArray.construct(rhs.mArray.ref());
return *this;
}
// Expose the API used by AudioEventTimeline
float* Data() const
{
MOZ_ASSERT(inited());
return mArray.ref().Data();
}
uint32_t Length() const
{
MOZ_ASSERT(inited());
return mArray.ref().Length();
}
bool inited() const
{
return !mArray.empty();
}
private:
Maybe<Float32Array> mArray;
};
}
typedef AudioEventTimeline<detail::FloatArrayWrapper, ErrorResult> AudioParamTimeline;
class AudioParam MOZ_FINAL : public nsWrapperCache,
public EnableWebAudioCheck,
public AudioParamTimeline
{
public:
AudioParam(AudioContext* aContext,
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 mContext;
}
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(detail::FloatArrayWrapper(aValues),
aStartTime, aDuration, aRv);
}
private:
nsRefPtr<AudioContext> mContext;
};
}
}
#endif