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 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25 #ifndef WebAudioBus_h 26 #define WebAudioBus_h 27 28 #include "WebCommon.h" 29 30 #if INSIDE_BLINK 31 namespace WTF { template <typename T> class PassRefPtr; } 32 #endif 33 34 namespace blink { 35 36 class AudioBus; 37 class WebAudioBusPrivate; 38 39 // A container for multi-channel linear PCM audio data. 40 // 41 // WARNING: It is not safe to pass a WebAudioBus across threads!!! 42 // 43 class BLINK_PLATFORM_EXPORT WebAudioBus { 44 public: 45 WebAudioBus() : m_private(0) { } 46 ~WebAudioBus() { reset(); } 47 48 // initialize() allocates memory of the given length for the given number of channels. 49 void initialize(unsigned numberOfChannels, size_t length, double sampleRate); 50 51 // resizeSmaller() can only be called after initialize() with a new length <= the initialization length. 52 // The data stored in the bus will remain undisturbed. 53 void resizeSmaller(size_t newLength); 54 55 // reset() releases the memory allocated from initialize(). 56 void reset(); 57 58 unsigned numberOfChannels() const; 59 size_t length() const; 60 double sampleRate() const; 61 62 float* channelData(unsigned channelIndex); 63 64 #if INSIDE_BLINK 65 WTF::PassRefPtr<AudioBus> release(); 66 #endif 67 68 private: 69 // Disallow copy and assign. 70 WebAudioBus(const WebAudioBus&); 71 void operator=(const WebAudioBus&); 72 73 AudioBus* m_private; 74 }; 75 76 } // namespace blink 77 78 #endif // WebAudioBus_h 79
