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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 *****
*/
#include "AUD_ChannelMapperReader.h"
#include "AUD_Buffer.h"
AUD_ChannelMapperReader::AUD_ChannelMapperReader(AUD_IReader* reader,
float **mapping) :
AUD_EffectReader(reader)
{
m_specs = reader->getSpecs();
if(m_specs.format != AUD_FORMAT_FLOAT32)
{
delete m_reader; AUD_DELETE("reader")
AUD_THROW(AUD_ERROR_READER);
}
int channels = -1;
m_rch = m_specs.channels;
while(mapping[++channels] != 0);
m_mapping = new float*[channels]; AUD_NEW("mapping")
m_specs.channels = (AUD_Channels)channels;
float sum;
int i;
while(channels--)
{
m_mapping[channels] = new float[m_rch]; AUD_NEW("mapping")
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 > 0.0 ? mapping[channels][i]/sum : 0.0;
}
m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
}
AUD_ChannelMapperReader::~AUD_ChannelMapperReader()
{
int channels = m_specs.channels;
while(channels--)
{
delete[] m_mapping[channels]; AUD_DELETE("mapping")
}
delete[] m_mapping; AUD_DELETE("mapping")
delete m_buffer; AUD_DELETE("buffer")
}
AUD_Specs AUD_ChannelMapperReader::getSpecs()
{
return m_specs;
}
void AUD_ChannelMapperReader::read(int & length, sample_t* & buffer)
{
m_reader->read(length, buffer);
int channels = m_specs.channels;
if(m_buffer->getSize() < length * 4 * channels)
m_buffer->resize(length * 4 * channels);
float* in = (float*)buffer;
float* out = (float*)m_buffer->getBuffer();
float sum;
for(int i = 0; i < length; i++)
{
for(int j = 0; j < channels; j++)
{
sum = 0;
for(int k = 0; k < m_rch; k++)
sum += m_mapping[j][k] * in[i * m_rch + k];
out[i * channels + j] = sum;
}
}
buffer = m_buffer->getBuffer();
}
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