root/DynamicsCompressorNode.h

INCLUDED FROM

/*
 * Copyright (C) 2011, Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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#ifndef DynamicsCompressorNode_h
#define DynamicsCompressorNode_h

#include "modules/webaudio/AudioNode.h"
#include "modules/webaudio/AudioParam.h"
#include "wtf/OwnPtr.h"

namespace WebCore {

class DynamicsCompressor;

class DynamicsCompressorNode : public AudioNode {
public:
    static PassRefPtr<DynamicsCompressorNode> create(AudioContext* context, float sampleRate)
    {
        return adoptRef(new DynamicsCompressorNode(context, sampleRate));
    }

    virtual ~DynamicsCompressorNode();

    // AudioNode
    virtual void process(size_t framesToProcess);
    virtual void reset();
    virtual void initialize();
    virtual void uninitialize();

    // Static compression curve parameters.
    AudioParam* threshold() { return m_threshold.get(); }
    AudioParam* knee() { return m_knee.get(); }
    AudioParam* ratio() { return m_ratio.get(); }
    AudioParam* attack() { return m_attack.get(); }
    AudioParam* release() { return m_release.get(); }

    // Amount by which the compressor is currently compressing the signal in decibels.
    AudioParam* reduction() { return m_reduction.get(); }

private:
    virtual double tailTime() const OVERRIDE;
    virtual double latencyTime() const OVERRIDE;

    DynamicsCompressorNode(AudioContext*, float sampleRate);

    OwnPtr<DynamicsCompressor> m_dynamicsCompressor;
    RefPtr<AudioParam> m_threshold;
    RefPtr<AudioParam> m_knee;
    RefPtr<AudioParam> m_ratio;
    RefPtr<AudioParam> m_reduction;
    RefPtr<AudioParam> m_attack;
    RefPtr<AudioParam> m_release;
};

} // namespace WebCore

#endif // DynamicsCompressorNode_h