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