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AUD_LimiterReader.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_LimiterReader.h"
#include "AUD_Buffer.h"

#include <iostream>

00031 AUD_LimiterReader::AUD_LimiterReader(AUD_IReader* reader,
                                                       float start, float end) :
            AUD_EffectReader(reader)
{
      m_end = (int)(end * reader->getSpecs().rate);

      if(start <= 0)
            m_start = 0;
      else
      {
            m_start = (int)(start * reader->getSpecs().rate);
            if(m_reader->isSeekable())
                  m_reader->seek(m_start);
            else
            {
                  // skip first m_start samples by reading them
                  int length;
                  sample_t* buffer;
                  for(int i = m_start;
                        i >= AUD_DEFAULT_BUFFER_SIZE;
                        i -= AUD_DEFAULT_BUFFER_SIZE)
                  {
                        length = AUD_DEFAULT_BUFFER_SIZE;
                        m_reader->read(length, buffer);
                        length = i;
                  }
                  m_reader->read(length, buffer);
            }
      }
}

00062 void AUD_LimiterReader::seek(int position)
{
      m_reader->seek(position + m_start);
}

00067 int AUD_LimiterReader::getLength()
{
      int len = m_reader->getLength();
      if(m_reader->getType() != AUD_TYPE_BUFFER || len < 0 ||
         (len > m_end && m_end >= 0))
            len = m_end;
      return len - m_start;
}

00076 int AUD_LimiterReader::getPosition()
{
      return m_reader->getPosition() - m_start;
}

00081 void AUD_LimiterReader::read(int & length, sample_t* & buffer)
{
      if(m_end >= 0)
      {
            int position = m_reader->getPosition();
            if(position+length > m_end)
                  length = m_end - position;
            if(length < 0)
            {
                  length = 0;
                  return;
            }
      }
      m_reader->read(length, buffer);
}

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