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 "Float32Array.h" 33 #include <wtf/PassRefPtr.h> 34 #include <wtf/RefCounted.h> 35 #include <wtf/RefPtr.h> 36 #include <wtf/Vector.h> 37 38 namespace WebCore { 39 40 class AudioBus; 41 42 class AudioBuffer : public RefCounted<AudioBuffer> { 43 public: 44 static PassRefPtr<AudioBuffer> create(unsigned numberOfChannels, size_t numberOfFrames, double sampleRate); 45 46 // Returns 0 if data is not a valid audio file. 47 static PassRefPtr<AudioBuffer> createFromAudioFileData(const void* data, size_t dataSize, bool mixToMono, double sampleRate); 48 49 // Format 50 size_t length() const { return m_length; } 51 double duration() const { return length() / sampleRate(); } 52 double sampleRate() const { return m_sampleRate; } 53 54 // Channel data access 55 unsigned numberOfChannels() const { return m_channels.size(); } 56 Float32Array* getChannelData(unsigned channelIndex); 57 void zero(); 58 59 // Scalar gain 60 double gain() const { return m_gain; } 61 void setGain(double gain) { m_gain = gain; } 62 63 // Because an AudioBuffer has a JavaScript wrapper, which will be garbage collected, it may take awhile for this object to be deleted. 64 // releaseMemory() can be called when the AudioContext goes away, so we can release the memory earlier than when the garbage collection happens. 65 // Careful! Only call this when the page unloads, after the AudioContext is no longer processing. 66 void releaseMemory(); 67 68 protected: 69 AudioBuffer(unsigned numberOfChannels, size_t numberOfFrames, double sampleRate); 70 AudioBuffer(AudioBus* bus); 71 72 double m_gain; // scalar gain 73 double m_sampleRate; 74 size_t m_length; 75 76 Vector<RefPtr<Float32Array> > m_channels; 77 }; 78 79 } // namespace WebCore 80 81 #endif // AudioBuffer_h 82
