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 AudioDestinationNode_h 26 #define AudioDestinationNode_h 27 28 #include "AudioBuffer.h" 29 #include "AudioNode.h" 30 #include "AudioSourceProvider.h" 31 32 namespace WebCore { 33 34 class AudioBus; 35 class AudioContext; 36 37 class AudioDestinationNode : public AudioNode, public AudioSourceProvider { 38 public: 39 AudioDestinationNode(AudioContext*, double sampleRate); 40 virtual ~AudioDestinationNode(); 41 42 // AudioNode 43 virtual void process(size_t) { }; // we're pulled by hardware so this is never called 44 virtual void reset() { m_currentTime = 0.0; }; 45 46 // The audio hardware calls here periodically to gets its input stream. 47 virtual void provideInput(AudioBus*, size_t numberOfFrames); 48 49 double currentTime() { return m_currentTime; } 50 51 virtual double sampleRate() const = 0; 52 53 virtual unsigned numberOfChannels() const { return 2; } // FIXME: update when multi-channel (more than stereo) is supported 54 55 virtual void startRendering() = 0; 56 57 protected: 58 double m_currentTime; 59 }; 60 61 } // namespace WebCore 62 63 #endif // AudioDestinationNode_h 64
