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132 lines
3.7 KiB
C++
132 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef AudioBuffer_h_
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#define AudioBuffer_h_
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#include "nsWrapperCache.h"
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#include "nsCycleCollectionParticipant.h"
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#include "mozilla/Attributes.h"
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#include "EnableWebAudioCheck.h"
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#include "nsAutoPtr.h"
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#include "nsTArray.h"
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#include "AudioContext.h"
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#include "AudioSegment.h"
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#include "AudioNodeEngine.h"
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struct JSContext;
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class JSObject;
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namespace mozilla {
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class ErrorResult;
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namespace dom {
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/**
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* An AudioBuffer keeps its data either in the mJSChannels objects, which
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* are Float32Arrays, or in mSharedChannels if the mJSChannels objects have
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* been neutered.
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*/
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class AudioBuffer MOZ_FINAL : public nsISupports,
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public nsWrapperCache,
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public EnableWebAudioCheck
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{
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public:
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AudioBuffer(AudioContext* aContext, uint32_t aLength,
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float aSampleRate);
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~AudioBuffer();
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// This function needs to be called in order to allocate
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// all of the channels. It is fallible!
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bool InitializeBuffers(uint32_t aNumberOfChannels,
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JSContext* aJSContext);
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(AudioBuffer)
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AudioContext* GetParentObject() const
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{
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return mContext;
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}
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virtual JSObject* WrapObject(JSContext* aCx, JSObject* aScope) MOZ_OVERRIDE;
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float SampleRate() const
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{
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return mSampleRate;
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}
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int32_t Length() const
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{
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return mLength;
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}
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double Duration() const
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{
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return mLength / static_cast<double> (mSampleRate);
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}
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uint32_t NumberOfChannels() const
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{
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return mJSChannels.Length();
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}
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/**
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* If mSharedChannels is non-null, copies its contents to
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* new Float32Arrays in mJSChannels. Returns a Float32Array.
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*/
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JSObject* GetChannelData(JSContext* aJSContext, uint32_t aChannel,
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ErrorResult& aRv);
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JSObject* GetChannelData(uint32_t aChannel) const {
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// Doesn't perform bounds checking
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MOZ_ASSERT(aChannel < mJSChannels.Length());
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return mJSChannels[aChannel];
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}
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/**
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* Returns a ThreadSharedFloatArrayBufferList containing the sample data
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* at aRate. Sets *aLength to the number of samples per channel.
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*/
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ThreadSharedFloatArrayBufferList* GetThreadSharedChannelsForRate(JSContext* aContext,
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uint32_t aRate,
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uint32_t* aLength);
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// aContents should either come from JS_AllocateArrayBufferContents or
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// JS_StealArrayBufferContents.
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void SetChannelDataFromArrayBufferContents(JSContext* aJSContext,
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uint32_t aChannel,
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void* aContents);
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protected:
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void RestoreJSChannelData(JSContext* aJSContext);
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void ClearJSChannels();
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nsRefPtr<AudioContext> mContext;
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// Float32Arrays
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nsAutoTArray<JSObject*,2> mJSChannels;
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// mSharedChannels aggregates the data from mJSChannels. This is non-null
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// if and only if the mJSChannels are neutered.
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nsRefPtr<ThreadSharedFloatArrayBufferList> mSharedChannels;
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// One-element cache of resampled data. Can be non-null only if mSharedChannels
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// is non-null.
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nsRefPtr<ThreadSharedFloatArrayBufferList> mResampledChannels;
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uint32_t mResampledChannelsRate;
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uint32_t mResampledChannelsLength;
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uint32_t mLength;
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float mSampleRate;
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};
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}
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}
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#endif
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