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 BiquadFilterNode_h 26 #define BiquadFilterNode_h 27 28 #include "modules/webaudio/AudioBasicProcessorNode.h" 29 #include "modules/webaudio/BiquadProcessor.h" 30 31 namespace WebCore { 32 33 class AudioParam; 34 35 class BiquadFilterNode : public AudioBasicProcessorNode { 36 public: 37 // These must be defined as in the .idl file and must match those in the BiquadProcessor class. 38 enum { 39 LOWPASS = 0, 40 HIGHPASS = 1, 41 BANDPASS = 2, 42 LOWSHELF = 3, 43 HIGHSHELF = 4, 44 PEAKING = 5, 45 NOTCH = 6, 46 ALLPASS = 7 47 }; 48 create(AudioContext * context,float sampleRate)49 static PassRefPtr<BiquadFilterNode> create(AudioContext* context, float sampleRate) 50 { 51 return adoptRef(new BiquadFilterNode(context, sampleRate)); 52 } 53 54 String type() const; 55 bool setType(unsigned); // Returns true on success. 56 void setType(const String&); 57 frequency()58 AudioParam* frequency() { return biquadProcessor()->parameter1(); } q()59 AudioParam* q() { return biquadProcessor()->parameter2(); } gain()60 AudioParam* gain() { return biquadProcessor()->parameter3(); } detune()61 AudioParam* detune() { return biquadProcessor()->parameter4(); } 62 63 // Get the magnitude and phase response of the filter at the given 64 // set of frequencies (in Hz). The phase response is in radians. 65 void getFrequencyResponse(const Float32Array* frequencyHz, 66 Float32Array* magResponse, 67 Float32Array* phaseResponse); 68 69 private: 70 BiquadFilterNode(AudioContext*, float sampleRate); 71 biquadProcessor()72 BiquadProcessor* biquadProcessor() { return static_cast<BiquadProcessor*>(processor()); } 73 }; 74 75 } // namespace WebCore 76 77 #endif // BiquadFilterNode_h 78