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/*
* $Id$
*
* ***** BEGIN LGPL LICENSE BLOCK *****
*
* Copyright 2009 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 Lesser General Public License as published by
* the Free Software Foundation, either version 3 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with AudaSpace. If not, see <http://www.gnu.org/licenses/>.
*
* ***** END LGPL LICENSE BLOCK *****
*/
#ifndef AUD_BASEIIRFILTERREADER
#define AUD_BASEIIRFILTERREADER
#include "AUD_EffectReader.h"
#include "AUD_Buffer.h"
/**
* This class is a base class for infinite impulse response filters.
*/
class AUD_BaseIIRFilterReader : public AUD_EffectReader
{
private:
/**
* Channel count.
*/
const int m_channels;
/**
* Length of input samples needed.
*/
const int m_xlen;
/**
* Length of output samples needed.
*/
const int m_ylen;
/**
* The playback buffer.
*/
AUD_Buffer m_buffer;
/**
* The last in samples array.
*/
sample_t* m_x;
/**
* The last out samples array.
*/
sample_t* m_y;
/**
* Position of the current input sample in the input array.
*/
int m_xpos;
/**
* Position of the current output sample in the output array.
*/
int m_ypos;
/**
* Current channel.
*/
int m_channel;
// hide copy constructor and operator=
AUD_BaseIIRFilterReader(const AUD_BaseIIRFilterReader&);
AUD_BaseIIRFilterReader& operator=(const AUD_BaseIIRFilterReader&);
protected:
/**
* Creates a new base IIR filter reader.
* \param reader The reader to read from.
* \param in The count of past input samples needed.
* \param out The count of past output samples needed.
*/
AUD_BaseIIRFilterReader(AUD_IReader* reader, int in, int out);
public:
inline sample_t x(int pos)
{
return m_x[(m_xpos + pos + m_xlen) % m_xlen * m_channels + m_channel];
}
inline sample_t y(int pos)
{
return m_y[(m_ypos + pos + m_ylen) % m_ylen * m_channels + m_channel];
}
virtual ~AUD_BaseIIRFilterReader();
virtual void read(int & length, sample_t* & buffer);
virtual sample_t filter()=0;
};
#endif //AUD_BASEIIRFILTERREADER
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