| /* |
| * 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 "config.h" |
| |
| #if ENABLE(WEB_AUDIO) |
| |
| #include "BiquadProcessor.h" |
| |
| #include "AudioUtilities.h" |
| #include "BiquadDSPKernel.h" |
| |
| namespace WebCore { |
| |
| BiquadProcessor::BiquadProcessor(BaseAudioContext& context, float sampleRate, size_t numberOfChannels, bool autoInitialize) |
| : AudioDSPKernelProcessor(sampleRate, numberOfChannels) |
| , m_parameter1(AudioParam::create(context, "frequency"_s, 350.0, 0.0, 0.5 * sampleRate, AutomationRate::ARate)) |
| , m_parameter2(AudioParam::create(context, "Q"_s, 1, -FLT_MAX, FLT_MAX, AutomationRate::ARate)) |
| , m_parameter3(AudioParam::create(context, "gain"_s, 0.0, -FLT_MAX, 40 * std::log10(std::numeric_limits<float>::max()), AutomationRate::ARate)) |
| , m_parameter4(AudioParam::create(context, "detune"_s, 0.0, -153600, 153600, AutomationRate::ARate)) |
| { |
| if (autoInitialize) |
| initialize(); |
| } |
| |
| BiquadProcessor::~BiquadProcessor() |
| { |
| if (isInitialized()) |
| uninitialize(); |
| } |
| |
| std::unique_ptr<AudioDSPKernel> BiquadProcessor::createKernel() |
| { |
| return makeUnique<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; |
| |
| m_shouldUseARate = m_parameter1->automationRate() == AutomationRate::ARate |
| || m_parameter2->automationRate() == AutomationRate::ARate |
| || m_parameter3->automationRate() == AutomationRate::ARate |
| || m_parameter4->automationRate() == AutomationRate::ARate; |
| } 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; |
| } |
| |
| 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::processOnlyAudioParams(size_t framesToProcess) |
| { |
| float values[AudioUtilities::renderQuantumSize]; |
| ASSERT(framesToProcess <= AudioUtilities::renderQuantumSize); |
| |
| m_parameter1->calculateSampleAccurateValues(values, framesToProcess); |
| m_parameter2->calculateSampleAccurateValues(values, framesToProcess); |
| m_parameter3->calculateSampleAccurateValues(values, framesToProcess); |
| m_parameter4->calculateSampleAccurateValues(values, framesToProcess); |
| } |
| |
| void BiquadProcessor::setType(BiquadFilterType type) |
| { |
| if (type != m_type) { |
| m_type = type; |
| reset(); // The filter state must be reset only if the type has changed. |
| } |
| } |
| |
| void BiquadProcessor::getFrequencyResponse(unsigned 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. |
| |
| auto responseKernel = makeUnique<BiquadDSPKernel>(this); |
| |
| // Get a copy of the current biquad filter coefficients so we can update |
| // |responseKernel| with these values. |
| float cutoffFrequency = parameter1().value(); |
| float q = parameter2().value(); |
| float gain = parameter3().value(); |
| float detune = parameter4().value(); |
| |
| responseKernel->updateCoefficients(1, &cutoffFrequency, &q, &gain, &detune); |
| responseKernel->getFrequencyResponse(nFrequencies, frequencyHz, magResponse, phaseResponse); |
| } |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(WEB_AUDIO) |