AUD_BaseIIRFilterReader.cpp

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/*
 * $Id: AUD_BaseIIRFilterReader.cpp 35141 2011-02-25 10:21:56Z jesterking $
 *
 * ***** 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 *****
 */

#include "AUD_BaseIIRFilterReader.h"

#include <cstring>

#define CC m_channels + m_channel

AUD_BaseIIRFilterReader::AUD_BaseIIRFilterReader(AUD_IReader* reader, int in,
                                                                                                 int out) :
                AUD_EffectReader(reader),
                m_channels(reader->getSpecs().channels),
                m_xlen(in), m_ylen(out),
                m_xpos(0), m_ypos(0), m_channel(0)
{
        m_x = new sample_t[in * m_channels];
        m_y = new sample_t[out * m_channels];

        memset(m_x, 0, sizeof(sample_t) * in * m_channels);
        memset(m_y, 0, sizeof(sample_t) * out * m_channels);
}

AUD_BaseIIRFilterReader::~AUD_BaseIIRFilterReader()
{
        delete[] m_x;
        delete[] m_y;
}

void AUD_BaseIIRFilterReader::read(int & length, sample_t* & buffer)
{
        sample_t* buf;

        int samplesize = AUD_SAMPLE_SIZE(m_reader->getSpecs());

        m_reader->read(length, buf);

        if(m_buffer.getSize() < length * samplesize)
                m_buffer.resize(length * samplesize);

        buffer = m_buffer.getBuffer();

        for(m_channel = 0; m_channel < m_channels; m_channel++)
        {
                for(int i = 0; i < length; i++)
                {
                        m_x[m_xpos * CC] = buf[i * CC];
                        m_y[m_ypos * CC] = buffer[i * CC] = filter();

                        m_xpos = (m_xpos + 1) % m_xlen;
                        m_ypos = (m_ypos + 1) % m_ylen;
                }
        }
}