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 AudioBasicProcessorNode_h 26 #define AudioBasicProcessorNode_h 27 28 #include "AudioNode.h" 29 #include <wtf/PassRefPtr.h> 30 #include <wtf/RefCounted.h> 31 #include <wtf/Threading.h> 32 33 namespace WebCore { 34 35 class AudioBus; 36 class AudioNodeInput; 37 class AudioProcessor; 38 39 // AudioBasicProcessorNode is an AudioNode with one input and one output where the input and output have the same number of channels. 40 class AudioBasicProcessorNode : public AudioNode { 41 public: 42 AudioBasicProcessorNode(AudioContext*, double sampleRate); 43 44 // AudioNode 45 virtual void process(size_t framesToProcess); 46 virtual void pullInputs(size_t framesToProcess); 47 virtual void reset(); 48 virtual void initialize(); 49 virtual void uninitialize(); 50 51 // Called in the main thread when the number of channels for the input may have changed. 52 virtual void checkNumberOfChannelsForInput(AudioNodeInput*); 53 54 // Returns the number of channels for both the input and the output. 55 unsigned numberOfChannels(); 56 57 protected: 58 AudioProcessor* processor() { return m_processor.get(); } 59 OwnPtr<AudioProcessor> m_processor; 60 61 private: 62 // This synchronizes live channel count changes which require an uninitialization / re-initialization. 63 mutable Mutex m_processLock; 64 }; 65 66 } // namespace WebCore 67 68 #endif // AudioBasicProcessorNode_h 69
