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 BiquadProcessor_h 26 #define BiquadProcessor_h 27 28 #include "AudioDSPKernel.h" 29 #include "AudioDSPKernelProcessor.h" 30 #include "AudioNode.h" 31 #include "AudioParam.h" 32 #include "Biquad.h" 33 #include <wtf/RefPtr.h> 34 35 namespace WebCore { 36 37 // BiquadProcessor is an AudioDSPKernelProcessor which uses Biquad objects to implement several common filters. 38 39 class BiquadProcessor : public AudioDSPKernelProcessor { 40 public: 41 enum FilterType { 42 LowPass2, 43 HighPass2, 44 Peaking, 45 Allpass, 46 LowShelf, 47 HighShelf 48 }; 49 50 BiquadProcessor(FilterType, double sampleRate, size_t numberOfChannels, bool autoInitialize = true); 51 virtual ~BiquadProcessor(); 52 53 virtual PassOwnPtr<AudioDSPKernel> createKernel(); 54 55 virtual void process(AudioBus* source, AudioBus* destination, size_t framesToProcess); 56 filterCoefficientsDirty()57 bool filterCoefficientsDirty() const { return m_filterCoefficientsDirty; } 58 parameter1()59 AudioParam* parameter1() { return m_parameter1.get(); } parameter2()60 AudioParam* parameter2() { return m_parameter2.get(); } parameter3()61 AudioParam* parameter3() { return m_parameter3.get(); } 62 type()63 FilterType type() const { return m_type; } 64 65 private: 66 FilterType m_type; 67 68 RefPtr<AudioParam> m_parameter1; 69 RefPtr<AudioParam> m_parameter2; 70 RefPtr<AudioParam> m_parameter3; 71 72 // so DSP kernels know when to re-compute coefficients 73 bool m_filterCoefficientsDirty; 74 }; 75 76 } // namespace WebCore 77 78 #endif // BiquadProcessor_h 79