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AUD_BufferReader.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_BufferReader.h"
#include "AUD_Buffer.h"
#include "AUD_Space.h"

00030 AUD_BufferReader::AUD_BufferReader(AUD_Reference<AUD_Buffer> buffer,
                                                   AUD_Specs specs)
{
      m_position = 0;
      m_buffer = buffer;
      m_specs = specs;
}

00038 bool AUD_BufferReader::isSeekable()
{
      return true;
}

00043 void AUD_BufferReader::seek(int position)
{
      if(position < 0)
            m_position = 0;
      else if(position > m_buffer.get()->getSize() / AUD_SAMPLE_SIZE(m_specs))
            m_position = m_buffer.get()->getSize() / AUD_SAMPLE_SIZE(m_specs);
      else
            m_position = position;
}

00053 int AUD_BufferReader::getLength()
{
      return m_buffer.get()->getSize()/AUD_SAMPLE_SIZE(m_specs);
}

00058 int AUD_BufferReader::getPosition()
{
      return m_position;
}

00063 AUD_Specs AUD_BufferReader::getSpecs()
{
      return m_specs;
}

00068 AUD_ReaderType AUD_BufferReader::getType()
{
      return AUD_TYPE_BUFFER;
}

00073 bool AUD_BufferReader::notify(AUD_Message &message)
{
      return false;
}

00078 void AUD_BufferReader::read(int & length, sample_t* & buffer)
{
      int sample_size = AUD_SAMPLE_SIZE(m_specs);

      buffer = m_buffer.get()->getBuffer()+m_position*sample_size;

      // in case the end of the buffer is reach
      if(m_buffer.get()->getSize() < (m_position+length)*sample_size)
            length = m_buffer.get()->getSize()/sample_size-m_position;

      if(length < 0)
            length = 0;
      m_position += length;
}

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