/*
* 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
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* 2. Redistributions in binary form must reproduce the above copyright
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* 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
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#ifndef WaveShaperProcessor_h
#define WaveShaperProcessor_h
#include "platform/audio/AudioDSPKernel.h"
#include "platform/audio/AudioDSPKernelProcessor.h"
#include "modules/webaudio/AudioNode.h"
#include "wtf/Float32Array.h"
#include "wtf/RefPtr.h"
#include "wtf/ThreadingPrimitives.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();
virtual PassOwnPtr<AudioDSPKernel> createKernel() OVERRIDE;
virtual void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) OVERRIDE;
void setCurve(Float32Array*);
Float32Array* curve() { return m_curve.get(); }
void setOversample(OverSampleType);
OverSampleType oversample() const { return m_oversample; }
private:
// m_curve represents the non-linear shaping curve.
RefPtr<Float32Array> m_curve;
OverSampleType m_oversample;
// This synchronizes process() with setCurve().
mutable Mutex m_processLock;
};
} // namespace WebCore
#endif // WaveShaperProcessor_h