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 DelayDSPKernel_h 26 #define DelayDSPKernel_h 27 28 #include "core/platform/audio/AudioArray.h" 29 #include "core/platform/audio/AudioDSPKernel.h" 30 #include "modules/webaudio/DelayProcessor.h" 31 32 namespace WebCore { 33 34 class DelayProcessor; 35 36 class DelayDSPKernel : public AudioDSPKernel { 37 public: 38 explicit DelayDSPKernel(DelayProcessor*); 39 DelayDSPKernel(double maxDelayTime, float sampleRate); 40 41 virtual void process(const float* source, float* destination, size_t framesToProcess); 42 virtual void reset(); 43 44 double maxDelayTime() const { return m_maxDelayTime; } 45 46 void setDelayFrames(double numberOfFrames) { m_desiredDelayFrames = numberOfFrames; } 47 48 virtual double tailTime() const OVERRIDE; 49 virtual double latencyTime() const OVERRIDE; 50 51 private: 52 AudioFloatArray m_buffer; 53 double m_maxDelayTime; 54 int m_writeIndex; 55 double m_currentDelayTime; 56 double m_smoothingRate; 57 bool m_firstTime; 58 double m_desiredDelayFrames; 59 60 AudioFloatArray m_delayTimes; 61 62 DelayProcessor* delayProcessor() { return static_cast<DelayProcessor*>(processor()); } 63 size_t bufferLengthForDelay(double delayTime, double sampleRate) const; 64 }; 65 66 } // namespace WebCore 67 68 #endif // DelayDSPKernel_h 69
