gecko/content/media/webaudio/AudioBuffer.h

87 lines
1.9 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 AudioBuffer_h_
#define AudioBuffer_h_
#include "nsWrapperCache.h"
#include "nsCycleCollectionParticipant.h"
#include "mozilla/Attributes.h"
#include "EnableWebAudioCheck.h"
#include "nsAutoPtr.h"
#include "nsTArray.h"
#include "AudioContext.h"
struct JSContext;
struct JSObject;
namespace mozilla {
class ErrorResult;
namespace dom {
class AudioBuffer MOZ_FINAL : public nsISupports,
public nsWrapperCache,
public EnableWebAudioCheck
{
public:
AudioBuffer(AudioContext* aContext, uint32_t aLength,
uint32_t aSampleRate);
~AudioBuffer();
// This function needs to be called in order to allocate
// all of the channels. It is fallible!
bool InitializeBuffers(uint32_t aNumberOfChannels,
JSContext* aJSContext);
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(AudioBuffer)
AudioContext* GetParentObject() const
{
return mContext;
}
virtual JSObject* WrapObject(JSContext* aCx, JSObject* aScope,
bool* aTriedToWrap);
float SampleRate() const
{
return mSampleRate;
}
uint32_t Length() const
{
return mLength;
}
double Duration() const
{
return mLength / static_cast<double> (mSampleRate);
}
uint32_t NumberOfChannels() const
{
return mChannels.Length();
}
JSObject* GetChannelData(JSContext* aJSContext, uint32_t aChannel,
ErrorResult& aRv) const;
private:
nsRefPtr<AudioContext> mContext;
FallibleTArray<JSObject*> mChannels;
uint32_t mLength;
float mSampleRate;
};
}
}
#endif