/*
* 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
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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*/
#ifndef EqualPowerPanner_h
#define EqualPowerPanner_h
#include "platform/audio/Panner.h"
namespace WebCore {
// Common type of stereo panner as found in normal audio mixing equipment.
class PLATFORM_EXPORT EqualPowerPanner : public Panner {
public:
EqualPowerPanner(float sampleRate);
virtual void pan(double azimuth, double elevation, const AudioBus* inputBus, AudioBus* outputBuf, size_t framesToProcess) OVERRIDE;
virtual void reset() OVERRIDE { m_isFirstRender = true; }
virtual double tailTime() const OVERRIDE { return 0; }
virtual double latencyTime() const OVERRIDE { return 0; }
private:
// For smoothing / de-zippering
bool m_isFirstRender;
double m_smoothingConstant;
double m_gainL;
double m_gainR;
};
} // namespace WebCore
#endif // EqualPowerPanner_h