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/*
* 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.
*/
#pragma once
#include "AudioArray.h"
#include "AudioDSPKernel.h"
#include "DelayProcessor.h"
#include <wtf/TZoneMalloc.h>
namespace WebCore {
class DelayProcessor;
class DelayDSPKernel final : public AudioDSPKernel {
WTF_MAKE_TZONE_ALLOCATED(DelayDSPKernel);
public:
explicit DelayDSPKernel(DelayProcessor*);
DelayDSPKernel(double maxDelayTime, float sampleRate);
void process(std::span<const float> source, std::span<float> destination) override;
void processOnlyAudioParams(size_t framesToProcess) final;
void reset() override;
double maxDelayTime() const { return m_maxDelayTime; }
void setDelayFrames(double numberOfFrames) { m_desiredDelayFrames = numberOfFrames; }
double tailTime() const override;
double latencyTime() const override;
bool requiresTailProcessing() const final;
private:
void processARate(std::span<const float> source, std::span<float> destination);
void processKRate(std::span<const float> source, std::span<float> destination);
AudioFloatArray m_buffer;
double m_maxDelayTime;
size_t m_writeIndex { 0 };
double m_desiredDelayFrames;
AudioFloatArray m_delayTimes;
// Temporary buffer used to hold the second sample for interpolation if needed.
AudioFloatArray m_tempBuffer;
DelayProcessor* delayProcessor() { return downcast<DelayProcessor>(processor()); }
};
} // namespace WebCore
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