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AUD_ChannelMapperReader.cpp

/*
 * $Id$
 *
 * ***** 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"

00029 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")
}

00064 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")
}

00078 AUD_Specs AUD_ChannelMapperReader::getSpecs()
{
      return m_specs;
}

00083 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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