1 /* 2 * Copyright (C) 2011, 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 WaveShaperProcessor_h 26 #define WaveShaperProcessor_h 27 28 #include "platform/audio/AudioDSPKernel.h" 29 #include "platform/audio/AudioDSPKernelProcessor.h" 30 #include "modules/webaudio/AudioNode.h" 31 #include "wtf/Float32Array.h" 32 #include "wtf/RefPtr.h" 33 #include "wtf/ThreadingPrimitives.h" 34 35 namespace WebCore { 36 37 // WaveShaperProcessor is an AudioDSPKernelProcessor which uses WaveShaperDSPKernel objects to implement non-linear distortion effects. 38 39 class WaveShaperProcessor : public AudioDSPKernelProcessor { 40 public: 41 enum OverSampleType { 42 OverSampleNone, 43 OverSample2x, 44 OverSample4x 45 }; 46 47 WaveShaperProcessor(float sampleRate, size_t numberOfChannels); 48 49 virtual ~WaveShaperProcessor(); 50 51 virtual PassOwnPtr<AudioDSPKernel> createKernel(); 52 53 virtual void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess); 54 55 void setCurve(Float32Array*); 56 Float32Array* curve() { return m_curve.get(); } 57 58 void setOversample(OverSampleType); 59 OverSampleType oversample() const { return m_oversample; } 60 61 private: 62 // m_curve represents the non-linear shaping curve. 63 RefPtr<Float32Array> m_curve; 64 65 OverSampleType m_oversample; 66 67 // This synchronizes process() with setCurve(). 68 mutable Mutex m_processLock; 69 }; 70 71 } // namespace WebCore 72 73 #endif // WaveShaperProcessor_h 74
