AUD_ChannelMapperReader.cpp

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/*
 * $Id: AUD_ChannelMapperReader.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_ChannelMapperReader.h"

AUD_ChannelMapperReader::AUD_ChannelMapperReader(AUD_IReader* reader,
                                                                                                 float **mapping) :
                AUD_EffectReader(reader)
{
        m_specs = reader->getSpecs();

        int channels = -1;
        m_rch = m_specs.channels;
        while(mapping[++channels] != 0);

        m_mapping = new float*[channels];
        m_specs.channels = (AUD_Channels)channels;

        float sum;
        int i;

        while(channels--)
        {
                m_mapping[channels] = new float[m_rch];
                sum = 0.0f;
                for(i=0; i < m_rch; i++)
                        sum += mapping[channels][i];
                for(i=0; i < m_rch; i++)
                        m_mapping[channels][i] = sum > 0.0f ?
                                                                         mapping[channels][i]/sum : 0.0f;
        }
}

AUD_ChannelMapperReader::~AUD_ChannelMapperReader()
{
        int channels = m_specs.channels;

        while(channels--)
        {
                delete[] m_mapping[channels];
        }

        delete[] m_mapping;
}

AUD_Specs AUD_ChannelMapperReader::getSpecs() const
{
        return m_specs;
}

void AUD_ChannelMapperReader::read(int & length, sample_t* & buffer)
{
        sample_t* in = buffer;

        m_reader->read(length, in);

        if(m_buffer.getSize() < length * AUD_SAMPLE_SIZE(m_specs))
                m_buffer.resize(length * AUD_SAMPLE_SIZE(m_specs));

        buffer = m_buffer.getBuffer();
        sample_t sum;

        for(int i = 0; i < length; i++)
        {
                for(int j = 0; j < m_specs.channels; j++)
                {
                        sum = 0;
                        for(int k = 0; k < m_rch; k++)
                                sum += m_mapping[j][k] * in[i * m_rch + k];
                        buffer[i * m_specs.channels + j] = sum;
                }
        }
}