AUD_BaseIIRFilterReader.h

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * Copyright 2009-2011 Jörg Hermann Müller
 *
 * This file is part of AudaSpace.
 *
 * Audaspace is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * AudaSpace is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Audaspace; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifndef AUD_BASEIIRFILTERREADER
#define AUD_BASEIIRFILTERREADER

#include "AUD_EffectReader.h"
#include "AUD_Buffer.h"

class AUD_BaseIIRFilterReader : public AUD_EffectReader
{
private:
    AUD_Specs m_specs;

    int m_xlen;

    int m_ylen;

    sample_t* m_x;

    sample_t* m_y;

    int m_xpos;

    int m_ypos;

    int m_channel;

    // hide copy constructor and operator=
    AUD_BaseIIRFilterReader(const AUD_BaseIIRFilterReader&);
    AUD_BaseIIRFilterReader& operator=(const AUD_BaseIIRFilterReader&);

protected:
    AUD_BaseIIRFilterReader(AUD_Reference<AUD_IReader> reader, int in, int out);

    void setLengths(int in, int out);

public:
    inline sample_t x(int pos)
    {
        return m_x[(m_xpos + pos + m_xlen) % m_xlen * m_specs.channels + m_channel];
    }

    inline sample_t y(int pos)
    {
        return m_y[(m_ypos + pos + m_ylen) % m_ylen * m_specs.channels + m_channel];
    }

    virtual ~AUD_BaseIIRFilterReader();

    virtual void read(int& length, bool& eos, sample_t* buffer);

    virtual sample_t filter()=0;

    virtual void sampleRateChanged(AUD_SampleRate rate);
};

#endif //AUD_BASEIIRFILTERREADER