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 AudioDSPKernel_h 32 #define AudioDSPKernel_h 33 34 #include "AudioDSPKernelProcessor.h" 35 36 namespace WebCore { 37 38 // AudioDSPKernel does the processing for one channel of an AudioDSPKernelProcessor. 39 40 class AudioDSPKernel { 41 public: 42 AudioDSPKernel(AudioDSPKernelProcessor* kernelProcessor) 43 : m_kernelProcessor(kernelProcessor) 44 , m_sampleRate(kernelProcessor->sampleRate()) 45 { 46 } 47 48 AudioDSPKernel(double sampleRate) 49 : m_kernelProcessor(0) 50 , m_sampleRate(sampleRate) 51 { 52 } 53 54 virtual ~AudioDSPKernel() { }; 55 56 // Subclasses must override process() to do the processing and reset() to reset DSP state. 57 virtual void process(const float* source, float* destination, size_t framesToProcess) = 0; 58 virtual void reset() = 0; 59 60 double sampleRate() const { return m_sampleRate; } 61 double nyquist() const { return 0.5 * sampleRate(); } 62 63 AudioDSPKernelProcessor* processor() { return m_kernelProcessor; } 64 const AudioDSPKernelProcessor* processor() const { return m_kernelProcessor; } 65 66 protected: 67 AudioDSPKernelProcessor* m_kernelProcessor; 68 double m_sampleRate; 69 }; 70 71 } // namespace WebCore 72 73 #endif // AudioDSPKernel_h 74
