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/*
* Copyright 2016 The Chromium Authors. All rights reserved.
* Copyright (C) 2020, Apple 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 "IIRDSPKernel.h"
namespace WebCore {
IIRDSPKernel::IIRDSPKernel(IIRProcessor& processor)
: AudioDSPKernel(&processor)
, m_iirFilter(processor.feedforward(), processor.feedback())
, m_tailTime(m_iirFilter.tailTime(processor.sampleRate(), processor.isFilterStable()))
{
}
void IIRDSPKernel::getFrequencyResponse(unsigned length, const float* frequencyHz, float* magResponse, float* phaseResponse)
{
ASSERT(frequencyHz);
ASSERT(magResponse);
ASSERT(phaseResponse);
Vector<float> frequency(length);
double nyquist = this->nyquist();
// Convert from frequency in Hz to normalized frequency (0 -> 1), with 1 equal to the Nyquist frequency.
for (unsigned k = 0; k < length; ++k)
frequency[k] = frequencyHz[k] / nyquist;
m_iirFilter.getFrequencyResponse(length, frequency.data(), magResponse, phaseResponse);
}
void IIRDSPKernel::process(const float* source, float* destination, size_t framesToProcess)
{
ASSERT(source);
ASSERT(destination);
m_iirFilter.process(source, destination, framesToProcess);
}
void IIRDSPKernel::reset()
{
m_iirFilter.reset();
}
bool IIRDSPKernel::requiresTailProcessing() const
{
// Always return true even if the tail time and latency might both be zero.
return true;
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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