Source/platform/audio/Panner.h

/*
 * Copyright (C) 2009 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.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE 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
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 */

#ifndef Panner_h
#define Panner_h

#include "platform/PlatformExport.h"
#include "wtf/PassOwnPtr.h"

namespace blink {

class AudioBus;
class HRTFDatabaseLoader;

// Abstract base class for panning a mono or stereo source.

class PLATFORM_EXPORT Panner {
public:
    enum {
        PanningModelEqualPower = 0,
        PanningModelHRTF = 1
    };

    typedef unsigned PanningModel;

    static PassOwnPtr<Panner> create(PanningModel, float sampleRate, HRTFDatabaseLoader*);

    virtual ~Panner() { };

    PanningModel panningModel() const { return m_panningModel; }

    virtual void pan(double azimuth, double elevation, const AudioBus* inputBus, AudioBus* outputBus, size_t framesToProcess) = 0;

    virtual void reset() = 0;

    virtual double tailTime() const = 0;
    virtual double latencyTime() const = 0;

protected:
    Panner(PanningModel model) : m_panningModel(model) { }

    PanningModel m_panningModel;
};

} // namespace blink

#endif // Panner_h