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#include "config.h" 26 27#if ENABLE(WEB_AUDIO) 28 29#include "BiquadFilterNode.h" 30 31#include "ExceptionCode.h" 32 33namespace WebCore { 34 35BiquadFilterNode::BiquadFilterNode(AudioContext* context, float sampleRate) 36 : AudioBasicProcessorNode(context, sampleRate) 37{ 38 // Initially setup as lowpass filter. 39 m_processor = adoptPtr(new BiquadProcessor(context, sampleRate, 1, false)); 40 setNodeType(NodeTypeBiquadFilter); 41} 42 43String BiquadFilterNode::type() const 44{ 45 switch (const_cast<BiquadFilterNode*>(this)->biquadProcessor()->type()) { 46 case BiquadProcessor::LowPass: 47 return "lowpass"; 48 case BiquadProcessor::HighPass: 49 return "highpass"; 50 case BiquadProcessor::BandPass: 51 return "bandpass"; 52 case BiquadProcessor::LowShelf: 53 return "lowshelf"; 54 case BiquadProcessor::HighShelf: 55 return "highshelf"; 56 case BiquadProcessor::Peaking: 57 return "peaking"; 58 case BiquadProcessor::Notch: 59 return "notch"; 60 case BiquadProcessor::Allpass: 61 return "allpass"; 62 default: 63 ASSERT_NOT_REACHED(); 64 return "lowpass"; 65 } 66} 67 68void BiquadFilterNode::setType(const String& type) 69{ 70 if (type == "lowpass") 71 setType(BiquadProcessor::LowPass); 72 else if (type == "highpass") 73 setType(BiquadProcessor::HighPass); 74 else if (type == "bandpass") 75 setType(BiquadProcessor::BandPass); 76 else if (type == "lowshelf") 77 setType(BiquadProcessor::LowShelf); 78 else if (type == "highshelf") 79 setType(BiquadProcessor::HighShelf); 80 else if (type == "peaking") 81 setType(BiquadProcessor::Peaking); 82 else if (type == "notch") 83 setType(BiquadProcessor::Notch); 84 else if (type == "allpass") 85 setType(BiquadProcessor::Allpass); 86 else 87 ASSERT_NOT_REACHED(); 88} 89 90bool BiquadFilterNode::setType(unsigned type) 91{ 92 if (type > BiquadProcessor::Allpass) 93 return false; 94 95 biquadProcessor()->setType(static_cast<BiquadProcessor::FilterType>(type)); 96 return true; 97} 98 99void BiquadFilterNode::getFrequencyResponse(const Float32Array* frequencyHz, 100 Float32Array* magResponse, 101 Float32Array* phaseResponse) 102{ 103 if (!frequencyHz || !magResponse || !phaseResponse) 104 return; 105 106 int n = std::min(frequencyHz->length(), 107 std::min(magResponse->length(), phaseResponse->length())); 108 109 if (n) { 110 biquadProcessor()->getFrequencyResponse(n, 111 frequencyHz->data(), 112 magResponse->data(), 113 phaseResponse->data()); 114 } 115} 116 117} // namespace WebCore 118 119#endif // ENABLE(WEB_AUDIO) 120