зеркало из https://github.com/mozilla/gecko-dev.git
139 строки
4.8 KiB
C++
139 строки
4.8 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 "AudioSegment.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 "mozilla/StaticPtr.h"
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#include "mozilla/StaticMutex.h"
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#include "nsTArray.h"
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#include "js/TypeDecls.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/dom/TypedArray.h"
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#include "nsPIDOMWindow.h"
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#include "nsIWeakReferenceUtils.h"
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namespace mozilla {
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class ErrorResult;
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class ThreadSharedFloatArrayBufferList;
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namespace dom {
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struct AudioBufferOptions;
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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' buffers
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* are detached.
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*/
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class AudioBuffer final : public nsWrapperCache {
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public:
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// If non-null, aInitialContents must have number of channels equal to
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// aNumberOfChannels and their lengths must be at least aLength.
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static already_AddRefed<AudioBuffer> Create(
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nsPIDOMWindowInner* aWindow, uint32_t aNumberOfChannels, uint32_t aLength,
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float aSampleRate,
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already_AddRefed<ThreadSharedFloatArrayBufferList> aInitialContents,
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ErrorResult& aRv);
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static already_AddRefed<AudioBuffer> Create(nsPIDOMWindowInner* aWindow,
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uint32_t aNumberOfChannels,
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uint32_t aLength,
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float aSampleRate,
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ErrorResult& aRv) {
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return Create(aWindow, aNumberOfChannels, aLength, aSampleRate, nullptr,
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aRv);
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}
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// Non-unit AudioChunk::mVolume is not supported
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static already_AddRefed<AudioBuffer> Create(nsPIDOMWindowInner* aWindow,
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float aSampleRate,
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AudioChunk&& aInitialContents);
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
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NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(AudioBuffer)
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(AudioBuffer)
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static already_AddRefed<AudioBuffer> Constructor(
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const GlobalObject& aGlobal, const AudioBufferOptions& aOptions,
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ErrorResult& aRv);
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nsPIDOMWindowInner* GetParentObject() const {
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nsCOMPtr<nsPIDOMWindowInner> parentObject = do_QueryReferent(mOwnerWindow);
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return parentObject;
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}
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JSObject* WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) override;
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float SampleRate() const { return mSampleRate; }
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uint32_t Length() const { return mSharedChannels.mDuration; }
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double Duration() const {
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return Length() / static_cast<double>(mSampleRate);
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}
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uint32_t NumberOfChannels() const { return mJSChannels.Length(); }
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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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void GetChannelData(JSContext* aJSContext, uint32_t aChannel,
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JS::MutableHandle<JSObject*> aRetval, ErrorResult& aRv);
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void CopyFromChannel(const Float32Array& aDestination,
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uint32_t aChannelNumber, uint32_t aBufferOffset,
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ErrorResult& aRv);
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void CopyToChannel(JSContext* aJSContext, const Float32Array& aSource,
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uint32_t aChannelNumber, uint32_t aBufferOffset,
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ErrorResult& aRv);
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/**
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* Returns a reference to an AudioChunk containing the sample data.
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* The AudioChunk can have a null buffer if there is no data.
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*/
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const AudioChunk& GetThreadSharedChannelsForRate(JSContext* aContext);
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protected:
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AudioBuffer(nsPIDOMWindowInner* aWindow, uint32_t aNumberOfChannels,
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uint32_t aLength, float aSampleRate, ErrorResult& aRv);
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~AudioBuffer();
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void SetSharedChannels(
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already_AddRefed<ThreadSharedFloatArrayBufferList> aBuffer);
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bool RestoreJSChannelData(JSContext* aJSContext);
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already_AddRefed<ThreadSharedFloatArrayBufferList>
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StealJSArrayDataIntoSharedChannels(JSContext* aJSContext);
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void ClearJSChannels();
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// Float32Arrays
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AutoTArray<JS::Heap<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' buffers are detached, but its mDuration
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// member keeps the buffer length regardless of whether the buffer is
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// provided by mJSChannels or mSharedChannels.
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AudioChunk mSharedChannels;
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nsWeakPtr mOwnerWindow;
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float mSampleRate;
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};
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} // namespace dom
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} // namespace mozilla
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#endif
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