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AUD_ReverseReader.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_ReverseReader.h"
#include "AUD_Buffer.h"

#include <cstring>

00031 AUD_ReverseReader::AUD_ReverseReader(AUD_IReader* reader) :
            AUD_EffectReader(reader)
{
      if(reader->getType() != AUD_TYPE_BUFFER)
            AUD_THROW(AUD_ERROR_READER);

      m_length = reader->getLength();
      if(m_length < 0)
            AUD_THROW(AUD_ERROR_READER);

      m_position = 0;
      m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
}

00045 AUD_ReverseReader::~AUD_ReverseReader()
{
      delete m_buffer; AUD_DELETE("buffer")
}

00050 void AUD_ReverseReader::seek(int position)
{
      m_position = position;
}

00055 int AUD_ReverseReader::getLength()
{
      return m_length;
}

00060 int AUD_ReverseReader::getPosition()
{
      return m_position;
}

00065 void AUD_ReverseReader::read(int & length, sample_t* & buffer)
{
      // first correct the length
      if(m_position+length > m_length)
            length = m_length-m_position;

      if(length <= 0)
      {
            length = 0;
            return;
      }

      int samplesize = AUD_SAMPLE_SIZE(getSpecs());

      // resize buffer if needed
      if(m_buffer->getSize() < length * samplesize)
            m_buffer->resize(length * samplesize);

      buffer = m_buffer->getBuffer();

      sample_t* buf;
      int len = length;

      // read from reader
      m_reader->seek(m_length-m_position-len);
      m_reader->read(len, buf);

      // set null if reader didn't give enough data
      if(len < length)
      {
            if(getSpecs().format == AUD_FORMAT_U8)
                  memset(buffer, 0x80, (length-len)*samplesize);
            else
                  memset(buffer, 0, (length-len)*samplesize);
            buffer += length-len;
      }

      // copy the samples reverted
      for(int i = 0; i < len; i++)
            memcpy(buffer + i * samplesize,
                     buf + (len - 1 - i) * samplesize,
                     samplesize);

      m_position += length;

      buffer = m_buffer->getBuffer();
}

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