/* * Copyright (C) 2010, Google Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef BiquadDSPKernel_h #define BiquadDSPKernel_h #include "platform/audio/AudioDSPKernel.h" #include "platform/audio/Biquad.h" #include "modules/webaudio/BiquadProcessor.h" namespace WebCore { class BiquadProcessor; // BiquadDSPKernel is an AudioDSPKernel and is responsible for filtering one channel of a BiquadProcessor using a Biquad object. class BiquadDSPKernel FINAL : public AudioDSPKernel { public: explicit BiquadDSPKernel(BiquadProcessor* processor) : AudioDSPKernel(processor) { } // AudioDSPKernel virtual void process(const float* source, float* dest, size_t framesToProcess) OVERRIDE; virtual void reset() OVERRIDE { m_biquad.reset(); } // Get the magnitude and phase response of the filter at the given // set of frequencies (in Hz). The phase response is in radians. void getFrequencyResponse(int nFrequencies, const float* frequencyHz, float* magResponse, float* phaseResponse); virtual double tailTime() const OVERRIDE; virtual double latencyTime() const OVERRIDE; protected: Biquad m_biquad; BiquadProcessor* biquadProcessor() { return static_cast<BiquadProcessor*>(processor()); } // To prevent audio glitches when parameters are changed, // dezippering is used to slowly change the parameters. // |useSmoothing| implies that we want to update using the // smoothed values. Otherwise the final target values are // used. If |forceUpdate| is true, we update the coefficients even // if they are not dirty. (Used when computing the frequency // response.) void updateCoefficientsIfNecessary(bool useSmoothing, bool forceUpdate); }; } // namespace WebCore #endif // BiquadDSPKernel_h