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 ScriptWrappable, public RefCounted<AudioBuffer> { 45 public: 46 static PassRefPtr<AudioBuffer> create(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate); 47 48 // Returns 0 if data is not a valid audio file. 49 static PassRefPtr<AudioBuffer> createFromAudioFileData(const void* data, size_t dataSize, bool mixToMono, float sampleRate); 50 51 // Format 52 size_t length() const { return m_length; } 53 double duration() const { return length() / sampleRate(); } 54 float sampleRate() const { return m_sampleRate; } 55 56 // Channel data access 57 unsigned numberOfChannels() const { return m_channels.size(); } 58 PassRefPtr<Float32Array> getChannelData(unsigned channelIndex, ExceptionState&); 59 Float32Array* getChannelData(unsigned channelIndex); 60 void zero(); 61 62 // Scalar gain 63 double gain() const { return m_gain; } 64 void setGain(double gain) { m_gain = gain; } 65 66 // Because an AudioBuffer has a JavaScript wrapper, which will be garbage collected, it may take awhile for this object to be deleted. 67 // releaseMemory() can be called when the AudioContext goes away, so we can release the memory earlier than when the garbage collection happens. 68 // Careful! Only call this when the page unloads, after the AudioContext is no longer processing. 69 void releaseMemory(); 70 71 static float minAllowedSampleRate(); 72 static float maxAllowedSampleRate(); 73 protected: 74 AudioBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate); 75 explicit AudioBuffer(AudioBus*); 76 bool createdSuccessfully(unsigned desiredNumberOfChannels) const; 77 78 double m_gain; // scalar gain 79 float m_sampleRate; 80 size_t m_length; 81 82 Vector<RefPtr<Float32Array> > m_channels; 83 }; 84 85 } // namespace WebCore 86 87 #endif // AudioBuffer_h 88
