| /* |
| * 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. |
| */ |
| |
| #include "modules/webaudio/BiquadDSPKernel.h" |
| #include "modules/webaudio/BiquadProcessor.h" |
| #include "wtf/PtrUtil.h" |
| #include <memory> |
| |
| namespace blink { |
| |
| BiquadProcessor::BiquadProcessor(float sampleRate, |
| size_t numberOfChannels, |
| AudioParamHandler& frequency, |
| AudioParamHandler& q, |
| AudioParamHandler& gain, |
| AudioParamHandler& detune) |
| : AudioDSPKernelProcessor(sampleRate, numberOfChannels), |
| m_type(LowPass), |
| m_parameter1(frequency), |
| m_parameter2(q), |
| m_parameter3(gain), |
| m_parameter4(detune), |
| m_filterCoefficientsDirty(true), |
| m_hasSampleAccurateValues(false) {} |
| |
| BiquadProcessor::~BiquadProcessor() { |
| if (isInitialized()) |
| uninitialize(); |
| } |
| |
| std::unique_ptr<AudioDSPKernel> BiquadProcessor::createKernel() { |
| return wrapUnique(new BiquadDSPKernel(this)); |
| } |
| |
| void BiquadProcessor::checkForDirtyCoefficients() { |
| // Deal with smoothing / de-zippering. Start out assuming filter parameters are not changing. |
| |
| // The BiquadDSPKernel objects rely on this value to see if they need to re-compute their internal filter coefficients. |
| m_filterCoefficientsDirty = false; |
| m_hasSampleAccurateValues = false; |
| |
| if (m_parameter1->hasSampleAccurateValues() || |
| m_parameter2->hasSampleAccurateValues() || |
| m_parameter3->hasSampleAccurateValues() || |
| m_parameter4->hasSampleAccurateValues()) { |
| m_filterCoefficientsDirty = true; |
| m_hasSampleAccurateValues = true; |
| } else { |
| if (m_hasJustReset) { |
| // Snap to exact values first time after reset, then smooth for subsequent changes. |
| m_parameter1->resetSmoothedValue(); |
| m_parameter2->resetSmoothedValue(); |
| m_parameter3->resetSmoothedValue(); |
| m_parameter4->resetSmoothedValue(); |
| m_filterCoefficientsDirty = true; |
| m_hasJustReset = false; |
| } else { |
| // Smooth all of the filter parameters. If they haven't yet converged to their target value then mark coefficients as dirty. |
| bool isStable1 = m_parameter1->smooth(); |
| bool isStable2 = m_parameter2->smooth(); |
| bool isStable3 = m_parameter3->smooth(); |
| bool isStable4 = m_parameter4->smooth(); |
| if (!(isStable1 && isStable2 && isStable3 && isStable4)) |
| m_filterCoefficientsDirty = true; |
| } |
| } |
| } |
| |
| void BiquadProcessor::process(const AudioBus* source, |
| AudioBus* destination, |
| size_t framesToProcess) { |
| if (!isInitialized()) { |
| destination->zero(); |
| return; |
| } |
| |
| // Synchronize with possible dynamic changes to the impulse response. |
| MutexTryLocker tryLocker(m_processLock); |
| if (!tryLocker.locked()) { |
| // Can't get the lock. We must be in the middle of changing something. |
| destination->zero(); |
| return; |
| } |
| |
| checkForDirtyCoefficients(); |
| |
| // For each channel of our input, process using the corresponding BiquadDSPKernel into the output channel. |
| for (unsigned i = 0; i < m_kernels.size(); ++i) |
| m_kernels[i]->process(source->channel(i)->data(), |
| destination->channel(i)->mutableData(), |
| framesToProcess); |
| } |
| |
| void BiquadProcessor::setType(FilterType type) { |
| if (type != m_type) { |
| m_type = type; |
| reset(); // The filter state must be reset only if the type has changed. |
| } |
| } |
| |
| void BiquadProcessor::getFrequencyResponse(int nFrequencies, |
| const float* frequencyHz, |
| float* magResponse, |
| float* phaseResponse) { |
| // Compute the frequency response on a separate temporary kernel |
| // to avoid interfering with the processing running in the audio |
| // thread on the main kernels. |
| |
| std::unique_ptr<BiquadDSPKernel> responseKernel = |
| wrapUnique(new BiquadDSPKernel(this)); |
| responseKernel->getFrequencyResponse(nFrequencies, frequencyHz, magResponse, |
| phaseResponse); |
| } |
| |
| } // namespace blink |