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#include "config.h" 26 27#if ENABLE(WEB_AUDIO) 28 29#include "BiquadDSPKernel.h" 30 31#include "BiquadProcessor.h" 32 33namespace WebCore { 34 35void BiquadDSPKernel::process(const float* source, float* destination, size_t framesToProcess) 36{ 37 ASSERT(source && destination && biquadProcessor()); 38 39 // Recompute filter coefficients if any of the parameters have changed. 40 // FIXME: as an optimization, implement a way that a Biquad object can simply copy its internal filter coefficients from another Biquad object. 41 // Then re-factor this code to only run for the first BiquadDSPKernel of each BiquadProcessor. 42 if (biquadProcessor()->filterCoefficientsDirty()) { 43 double value1 = biquadProcessor()->parameter1()->smoothedValue(); 44 double value2 = biquadProcessor()->parameter2()->smoothedValue(); 45 46 // Convert from Hertz to normalized frequency 0 -> 1. 47 double nyquist = this->nyquist(); 48 double normalizedValue1 = value1 / nyquist; 49 50 // Configure the biquad with the new filter parameters for the appropriate type of filter. 51 switch (biquadProcessor()->type()) { 52 case BiquadProcessor::LowPass2: 53 m_biquad.setLowpassParams(normalizedValue1, value2); 54 break; 55 56 case BiquadProcessor::HighPass2: 57 m_biquad.setHighpassParams(normalizedValue1, value2); 58 break; 59 60 case BiquadProcessor::LowShelf: 61 m_biquad.setLowShelfParams(normalizedValue1, value2); 62 break; 63 64 // FIXME: add other biquad filter types... 65 case BiquadProcessor::Peaking: 66 case BiquadProcessor::Allpass: 67 case BiquadProcessor::HighShelf: 68 break; 69 } 70 } 71 72 m_biquad.process(source, destination, framesToProcess); 73} 74 75} // namespace WebCore 76 77#endif // ENABLE(WEB_AUDIO) 78