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comparison: content/media/webaudio/AudioBuffer.h
content/media/webaudio/AudioBuffer.h
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| -1:000000000000 | 0:00616117f28a |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim:set ts=2 sw=2 sts=2 et cindent: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef AudioBuffer_h_ | |
| 8 #define AudioBuffer_h_ | |
| 9 | |
| 10 #include "nsWrapperCache.h" | |
| 11 #include "nsCycleCollectionParticipant.h" | |
| 12 #include "mozilla/Attributes.h" | |
| 13 #include "nsAutoPtr.h" | |
| 14 #include "nsTArray.h" | |
| 15 #include "AudioContext.h" | |
| 16 #include "js/TypeDecls.h" | |
| 17 #include "mozilla/MemoryReporting.h" | |
| 18 | |
| 19 namespace mozilla { | |
| 20 | |
| 21 class ErrorResult; | |
| 22 class ThreadSharedFloatArrayBufferList; | |
| 23 | |
| 24 namespace dom { | |
| 25 | |
| 26 class AudioContext; | |
| 27 | |
| 28 /** | |
| 29 * An AudioBuffer keeps its data either in the mJSChannels objects, which | |
| 30 * are Float32Arrays, or in mSharedChannels if the mJSChannels objects have | |
| 31 * been neutered. | |
| 32 */ | |
| 33 class AudioBuffer MOZ_FINAL : public nsWrapperCache | |
| 34 { | |
| 35 public: | |
| 36 static already_AddRefed<AudioBuffer> | |
| 37 Create(AudioContext* aContext, uint32_t aNumberOfChannels, | |
| 38 uint32_t aLength, float aSampleRate, | |
| 39 JSContext* aJSContext, ErrorResult& aRv); | |
| 40 | |
| 41 size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; | |
| 42 | |
| 43 NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(AudioBuffer) | |
| 44 NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(AudioBuffer) | |
| 45 | |
| 46 AudioContext* GetParentObject() const | |
| 47 { | |
| 48 return mContext; | |
| 49 } | |
| 50 | |
| 51 virtual JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE; | |
| 52 | |
| 53 float SampleRate() const | |
| 54 { | |
| 55 return mSampleRate; | |
| 56 } | |
| 57 | |
| 58 int32_t Length() const | |
| 59 { | |
| 60 return mLength; | |
| 61 } | |
| 62 | |
| 63 double Duration() const | |
| 64 { | |
| 65 return mLength / static_cast<double> (mSampleRate); | |
| 66 } | |
| 67 | |
| 68 uint32_t NumberOfChannels() const | |
| 69 { | |
| 70 return mJSChannels.Length(); | |
| 71 } | |
| 72 | |
| 73 /** | |
| 74 * If mSharedChannels is non-null, copies its contents to | |
| 75 * new Float32Arrays in mJSChannels. Returns a Float32Array. | |
| 76 */ | |
| 77 void GetChannelData(JSContext* aJSContext, uint32_t aChannel, | |
| 78 JS::MutableHandle<JSObject*> aRetval, | |
| 79 ErrorResult& aRv); | |
| 80 | |
| 81 void CopyFromChannel(const Float32Array& aDestination, uint32_t aChannelNumber, | |
| 82 uint32_t aStartInChannel, ErrorResult& aRv); | |
| 83 void CopyToChannel(JSContext* aJSContext, const Float32Array& aSource, | |
| 84 uint32_t aChannelNumber, uint32_t aStartInChannel, | |
| 85 ErrorResult& aRv); | |
| 86 | |
| 87 /** | |
| 88 * Returns a ThreadSharedFloatArrayBufferList containing the sample data. | |
| 89 * Can return null if there is no data. | |
| 90 */ | |
| 91 ThreadSharedFloatArrayBufferList* GetThreadSharedChannelsForRate(JSContext* aContext); | |
| 92 | |
| 93 // This replaces the contents of the JS array for the given channel. | |
| 94 // This function needs to be called on an AudioBuffer which has not been | |
| 95 // handed off to the content yet, and right after the object has been | |
| 96 // initialized. | |
| 97 void SetRawChannelContents(JSContext* aJSContext, | |
| 98 uint32_t aChannel, | |
| 99 float* aContents); | |
| 100 | |
| 101 protected: | |
| 102 AudioBuffer(AudioContext* aContext, uint32_t aNumberOfChannels, | |
| 103 uint32_t aLength, float aSampleRate); | |
| 104 ~AudioBuffer(); | |
| 105 | |
| 106 bool RestoreJSChannelData(JSContext* aJSContext); | |
| 107 void ClearJSChannels(); | |
| 108 | |
| 109 nsRefPtr<AudioContext> mContext; | |
| 110 // Float32Arrays | |
| 111 nsAutoTArray<JS::Heap<JSObject*>, 2> mJSChannels; | |
| 112 | |
| 113 // mSharedChannels aggregates the data from mJSChannels. This is non-null | |
| 114 // if and only if the mJSChannels are neutered. | |
| 115 nsRefPtr<ThreadSharedFloatArrayBufferList> mSharedChannels; | |
| 116 | |
| 117 uint32_t mLength; | |
| 118 float mSampleRate; | |
| 119 }; | |
| 120 | |
| 121 } | |
| 122 } | |
| 123 | |
| 124 #endif | |
| 125 |
