content/media/webaudio/AudioBuffer.h@6474c204b198 (annotated)
content/media/webaudio/AudioBuffer.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* vim:set ts=2 sw=2 sts=2 et cindent: */ |
| michael@0 | 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #ifndef AudioBuffer_h_ |
| michael@0 | 8 | #define AudioBuffer_h_ |
| michael@0 | 9 | |
| michael@0 | 10 | #include "nsWrapperCache.h" |
| michael@0 | 11 | #include "nsCycleCollectionParticipant.h" |
| michael@0 | 12 | #include "mozilla/Attributes.h" |
| michael@0 | 13 | #include "nsAutoPtr.h" |
| michael@0 | 14 | #include "nsTArray.h" |
| michael@0 | 15 | #include "AudioContext.h" |
| michael@0 | 16 | #include "js/TypeDecls.h" |
| michael@0 | 17 | #include "mozilla/MemoryReporting.h" |
| michael@0 | 18 | |
| michael@0 | 19 | namespace mozilla { |
| michael@0 | 20 | |
| michael@0 | 21 | class ErrorResult; |
| michael@0 | 22 | class ThreadSharedFloatArrayBufferList; |
| michael@0 | 23 | |
| michael@0 | 24 | namespace dom { |
| michael@0 | 25 | |
| michael@0 | 26 | class AudioContext; |
| michael@0 | 27 | |
| michael@0 | 28 | /** |
| michael@0 | 29 | * An AudioBuffer keeps its data either in the mJSChannels objects, which |
| michael@0 | 30 | * are Float32Arrays, or in mSharedChannels if the mJSChannels objects have |
| michael@0 | 31 | * been neutered. |
| michael@0 | 32 | */ |
| michael@0 | 33 | class AudioBuffer MOZ_FINAL : public nsWrapperCache |
| michael@0 | 34 | { |
| michael@0 | 35 | public: |
| michael@0 | 36 | static already_AddRefed<AudioBuffer> |
| michael@0 | 37 | Create(AudioContext* aContext, uint32_t aNumberOfChannels, |
| michael@0 | 38 | uint32_t aLength, float aSampleRate, |
| michael@0 | 39 | JSContext* aJSContext, ErrorResult& aRv); |
| michael@0 | 40 | |
| michael@0 | 41 | size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const; |
| michael@0 | 42 | |
| michael@0 | 43 | NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(AudioBuffer) |
| michael@0 | 44 | NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(AudioBuffer) |
| michael@0 | 45 | |
| michael@0 | 46 | AudioContext* GetParentObject() const |
| michael@0 | 47 | { |
| michael@0 | 48 | return mContext; |
| michael@0 | 49 | } |
| michael@0 | 50 | |
| michael@0 | 51 | virtual JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE; |
| michael@0 | 52 | |
| michael@0 | 53 | float SampleRate() const |
| michael@0 | 54 | { |
| michael@0 | 55 | return mSampleRate; |
| michael@0 | 56 | } |
| michael@0 | 57 | |
| michael@0 | 58 | int32_t Length() const |
| michael@0 | 59 | { |
| michael@0 | 60 | return mLength; |
| michael@0 | 61 | } |
| michael@0 | 62 | |
| michael@0 | 63 | double Duration() const |
| michael@0 | 64 | { |
| michael@0 | 65 | return mLength / static_cast<double> (mSampleRate); |
| michael@0 | 66 | } |
| michael@0 | 67 | |
| michael@0 | 68 | uint32_t NumberOfChannels() const |
| michael@0 | 69 | { |
| michael@0 | 70 | return mJSChannels.Length(); |
| michael@0 | 71 | } |
| michael@0 | 72 | |
| michael@0 | 73 | /** |
| michael@0 | 74 | * If mSharedChannels is non-null, copies its contents to |
| michael@0 | 75 | * new Float32Arrays in mJSChannels. Returns a Float32Array. |
| michael@0 | 76 | */ |
| michael@0 | 77 | void GetChannelData(JSContext* aJSContext, uint32_t aChannel, |
| michael@0 | 78 | JS::MutableHandle<JSObject*> aRetval, |
| michael@0 | 79 | ErrorResult& aRv); |
| michael@0 | 80 | |
| michael@0 | 81 | void CopyFromChannel(const Float32Array& aDestination, uint32_t aChannelNumber, |
| michael@0 | 82 | uint32_t aStartInChannel, ErrorResult& aRv); |
| michael@0 | 83 | void CopyToChannel(JSContext* aJSContext, const Float32Array& aSource, |
| michael@0 | 84 | uint32_t aChannelNumber, uint32_t aStartInChannel, |
| michael@0 | 85 | ErrorResult& aRv); |
| michael@0 | 86 | |
| michael@0 | 87 | /** |
| michael@0 | 88 | * Returns a ThreadSharedFloatArrayBufferList containing the sample data. |
| michael@0 | 89 | * Can return null if there is no data. |
| michael@0 | 90 | */ |
| michael@0 | 91 | ThreadSharedFloatArrayBufferList* GetThreadSharedChannelsForRate(JSContext* aContext); |
| michael@0 | 92 | |
| michael@0 | 93 | // This replaces the contents of the JS array for the given channel. |
| michael@0 | 94 | // This function needs to be called on an AudioBuffer which has not been |
| michael@0 | 95 | // handed off to the content yet, and right after the object has been |
| michael@0 | 96 | // initialized. |
| michael@0 | 97 | void SetRawChannelContents(JSContext* aJSContext, |
| michael@0 | 98 | uint32_t aChannel, |
| michael@0 | 99 | float* aContents); |
| michael@0 | 100 | |
| michael@0 | 101 | protected: |
| michael@0 | 102 | AudioBuffer(AudioContext* aContext, uint32_t aNumberOfChannels, |
| michael@0 | 103 | uint32_t aLength, float aSampleRate); |
| michael@0 | 104 | ~AudioBuffer(); |
| michael@0 | 105 | |
| michael@0 | 106 | bool RestoreJSChannelData(JSContext* aJSContext); |
| michael@0 | 107 | void ClearJSChannels(); |
| michael@0 | 108 | |
| michael@0 | 109 | nsRefPtr<AudioContext> mContext; |
| michael@0 | 110 | // Float32Arrays |
| michael@0 | 111 | nsAutoTArray<JS::Heap<JSObject*>, 2> mJSChannels; |
| michael@0 | 112 | |
| michael@0 | 113 | // mSharedChannels aggregates the data from mJSChannels. This is non-null |
| michael@0 | 114 | // if and only if the mJSChannels are neutered. |
| michael@0 | 115 | nsRefPtr<ThreadSharedFloatArrayBufferList> mSharedChannels; |
| michael@0 | 116 | |
| michael@0 | 117 | uint32_t mLength; |
| michael@0 | 118 | float mSampleRate; |
| michael@0 | 119 | }; |
| michael@0 | 120 | |
| michael@0 | 121 | } |
| michael@0 | 122 | } |
| michael@0 | 123 | |
| michael@0 | 124 | #endif |
| michael@0 | 125 |
