1 /* 2 * Copyright (C) 2010 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef AudioBuffer_h 30 #define AudioBuffer_h 31 32 #include "bindings/v8/ScriptWrappable.h" 33 #include "wtf/Float32Array.h" 34 #include "wtf/PassRefPtr.h" 35 #include "wtf/RefCounted.h" 36 #include "wtf/RefPtr.h" 37 #include "wtf/Vector.h" 38 39 namespace WebCore { 40 41 class AudioBus; 42 class ExceptionState; 43 44 class AudioBuffer : public RefCountedWillBeGarbageCollectedFinalized<AudioBuffer>, public ScriptWrappable { 45 public: 46 static PassRefPtrWillBeRawPtr<AudioBuffer> create(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate); 47 static PassRefPtrWillBeRawPtr<AudioBuffer> create(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate, ExceptionState&); 48 49 // Returns 0 if data is not a valid audio file. 50 static PassRefPtrWillBeRawPtr<AudioBuffer> createFromAudioFileData(const void* data, size_t dataSize, bool mixToMono, float sampleRate); 51 52 static PassRefPtrWillBeRawPtr<AudioBuffer> createFromAudioBus(AudioBus*); 53 54 // Format length()55 size_t length() const { return m_length; } duration()56 double duration() const { return length() / static_cast<double>(sampleRate()); } sampleRate()57 float sampleRate() const { return m_sampleRate; } 58 59 // Channel data access numberOfChannels()60 unsigned numberOfChannels() const { return m_channels.size(); } 61 PassRefPtr<Float32Array> getChannelData(unsigned channelIndex, ExceptionState&); 62 Float32Array* getChannelData(unsigned channelIndex); 63 void zero(); 64 65 static float minAllowedSampleRate(); 66 static float maxAllowedSampleRate(); 67 trace(Visitor *)68 void trace(Visitor*) { } 69 70 protected: 71 AudioBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate); 72 explicit AudioBuffer(AudioBus*); 73 bool createdSuccessfully(unsigned desiredNumberOfChannels) const; 74 75 float m_sampleRate; 76 size_t m_length; 77 78 Vector<RefPtr<Float32Array> > m_channels; 79 }; 80 81 } // namespace WebCore 82 83 #endif // AudioBuffer_h 84