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 are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef AudioDSPKernelProcessor_h 32 #define AudioDSPKernelProcessor_h 33 34 #include "AudioBus.h" 35 #include "AudioProcessor.h" 36 #include <wtf/OwnPtr.h> 37 #include <wtf/PassOwnPtr.h> 38 #include <wtf/Vector.h> 39 40 namespace WebCore { 41 42 class AudioBus; 43 class AudioDSPKernel; 44 class AudioProcessor; 45 46 // AudioDSPKernelProcessor processes one input -> one output (N channels each) 47 // It uses one AudioDSPKernel object per channel to do the processing, thus there is no cross-channel processing. 48 // Despite this limitation it turns out to be a very common and useful type of processor. 49 50 class AudioDSPKernelProcessor : public AudioProcessor { 51 public: 52 // numberOfChannels may be later changed if object is not yet in an "initialized" state 53 AudioDSPKernelProcessor(double sampleRate, unsigned numberOfChannels); 54 55 // Subclasses create the appropriate type of processing kernel here. 56 // We'll call this to create a kernel for each channel. 57 virtual PassOwnPtr<AudioDSPKernel> createKernel() = 0; 58 59 // AudioProcessor methods 60 virtual void initialize(); 61 virtual void uninitialize(); 62 virtual void process(AudioBus* source, AudioBus* destination, size_t framesToProcess); 63 virtual void reset(); 64 virtual void setNumberOfChannels(unsigned numberOfChannels); 65 numberOfChannels()66 unsigned numberOfChannels() const { return m_numberOfChannels; } 67 68 protected: 69 unsigned m_numberOfChannels; 70 Vector<OwnPtr<AudioDSPKernel> > m_kernels; 71 bool m_hasJustReset; 72 }; 73 74 } // namespace WebCore 75 76 #endif // AudioDSPKernelProcessor_h 77