1a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch/* 2a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * Copyright (C) 2010, Google Inc. All rights reserved. 3a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * 4a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * Redistribution and use in source and binary forms, with or without 5a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * modification, are permitted provided that the following conditions 6a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * are met: 7a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * 1. Redistributions of source code must retain the above copyright 8a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * notice, this list of conditions and the following disclaimer. 9a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * 2. Redistributions in binary form must reproduce the above copyright 10a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * notice, this list of conditions and the following disclaimer in the 11a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * documentation and/or other materials provided with the distribution. 12a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * 13a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY 14a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY 17a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 18a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 19a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 20a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 22a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch */ 24a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 25a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch#include "config.h" 26a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 27a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch#if ENABLE(WEB_AUDIO) 28a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 29a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch#include "BiquadDSPKernel.h" 30a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 31a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch#include "BiquadProcessor.h" 32a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 33a94275402997c11dd2e778633dacf4b7e630a35dBen Murdochnamespace WebCore { 34a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 35a94275402997c11dd2e778633dacf4b7e630a35dBen Murdochvoid BiquadDSPKernel::process(const float* source, float* destination, size_t framesToProcess) 36a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch{ 37a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch ASSERT(source && destination && biquadProcessor()); 38a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 39a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch // Recompute filter coefficients if any of the parameters have changed. 40a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch // FIXME: as an optimization, implement a way that a Biquad object can simply copy its internal filter coefficients from another Biquad object. 41a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch // Then re-factor this code to only run for the first BiquadDSPKernel of each BiquadProcessor. 42a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch if (biquadProcessor()->filterCoefficientsDirty()) { 43a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch double value1 = biquadProcessor()->parameter1()->smoothedValue(); 44a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch double value2 = biquadProcessor()->parameter2()->smoothedValue(); 45a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 46a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch // Convert from Hertz to normalized frequency 0 -> 1. 47a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch double nyquist = this->nyquist(); 48a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch double normalizedValue1 = value1 / nyquist; 49a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 50a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch // Configure the biquad with the new filter parameters for the appropriate type of filter. 51a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch switch (biquadProcessor()->type()) { 52a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch case BiquadProcessor::LowPass2: 53a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch m_biquad.setLowpassParams(normalizedValue1, value2); 54a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch break; 55a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 56a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch case BiquadProcessor::HighPass2: 57a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch m_biquad.setHighpassParams(normalizedValue1, value2); 58a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch break; 59a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 60a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch case BiquadProcessor::LowShelf: 61a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch m_biquad.setLowShelfParams(normalizedValue1, value2); 62a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch break; 63a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 64a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch // FIXME: add other biquad filter types... 65a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch case BiquadProcessor::Peaking: 66a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch case BiquadProcessor::Allpass: 67a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch case BiquadProcessor::HighShelf: 68a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch break; 69a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch } 70a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch } 71a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 72a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch m_biquad.process(source, destination, framesToProcess); 73a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch} 74a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 75a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch} // namespace WebCore 76a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch 77a94275402997c11dd2e778633dacf4b7e630a35dBen Murdoch#endif // ENABLE(WEB_AUDIO) 78