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/*
* Copyright (C) 2011, 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 "AudioDSPKernel.h"
#include "AudioDSPKernelProcessor.h"
#include "AudioNode.h"
#include <JavaScriptCore/Forward.h>
#include <memory>
#include <wtf/Lock.h>
#include <wtf/RefPtr.h>
namespace WebCore {
// WaveShaperProcessor is an AudioDSPKernelProcessor which uses WaveShaperDSPKernel objects to implement non-linear distortion effects.
class WaveShaperProcessor final : public AudioDSPKernelProcessor {
public:
enum OverSampleType {
OverSampleNone,
OverSample2x,
OverSample4x
};
WaveShaperProcessor(float sampleRate, size_t numberOfChannels);
virtual ~WaveShaperProcessor();
std::unique_ptr<AudioDSPKernel> createKernel() final;
void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) final;
void setCurveForBindings(Float32Array*);
Float32Array* curveForBindings() WTF_IGNORES_THREAD_SAFETY_ANALYSIS { ASSERT(isMainThread()); return m_curve.get(); } // Doesn't grab the lock, only safe to call on the main thread.
Float32Array* curve() const WTF_REQUIRES_LOCK(m_processLock) { return m_curve.get(); }
void setOversampleForBindings(OverSampleType);
OverSampleType oversampleForBindings() const WTF_IGNORES_THREAD_SAFETY_ANALYSIS { ASSERT(isMainThread()); return m_oversample; } // Doesn't grab the lock, only safe to call on the main thread.
OverSampleType oversample() const WTF_REQUIRES_LOCK(m_processLock) { return m_oversample; }
Lock& processLock() const WTF_RETURNS_LOCK(m_processLock) { return m_processLock; }
private:
// m_curve represents the non-linear shaping curve.
RefPtr<Float32Array> m_curve WTF_GUARDED_BY_LOCK(m_processLock);
OverSampleType m_oversample WTF_GUARDED_BY_LOCK(m_processLock) { OverSampleNone };
// This synchronizes process() with setCurve().
mutable Lock m_processLock;
};
} // namespace WebCore
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