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AUD_DelayReader.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_DelayReader.h"
#include "AUD_Buffer.h"

#include <cstring>

00031 AUD_DelayReader::AUD_DelayReader(AUD_IReader* reader, float delay) :
            AUD_EffectReader(reader)
{
      m_delay = (int)(delay * reader->getSpecs().rate);
      m_remdelay = m_delay;
      m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
}

00039 AUD_DelayReader::~AUD_DelayReader()
{
      delete m_buffer; AUD_DELETE("buffer")
}

00044 void AUD_DelayReader::seek(int position)
{
      if(position < 0)
            return;

      if(position < m_delay)
      {
            m_remdelay = m_delay - position;
            m_reader->seek(0);
      }
      else
      {
            m_remdelay = 0;
            m_reader->seek(position - m_delay);
      }
}

00061 int AUD_DelayReader::getLength()
{
      int len = m_reader->getLength();
      if(len < 0)
            return len;
      return len+m_delay;
}

00069 int AUD_DelayReader::getPosition()
{
      if(m_remdelay > 0)
            return m_delay-m_remdelay;
      return m_reader->getPosition() + m_delay;
}

00076 void AUD_DelayReader::read(int & length, sample_t* & buffer)
{
      if(m_remdelay > 0)
      {
            int samplesize = AUD_SAMPLE_SIZE(m_reader->getSpecs());

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

            if(length > m_remdelay)
            {
                  if(getSpecs().format == AUD_FORMAT_U8)
                        memset(m_buffer->getBuffer(), 0x80, m_remdelay*samplesize);
                  else
                        memset(m_buffer->getBuffer(), 0, m_remdelay*samplesize);
                  int len = length - m_remdelay;
                  m_reader->read(len, buffer);
                  memcpy(m_buffer->getBuffer()+m_remdelay*samplesize,
                           buffer, len*samplesize);
                  if(len < length-m_remdelay)
                        length = m_remdelay + len;
                  m_remdelay = 0;
            }
            else
            {
                  if(getSpecs().format == AUD_FORMAT_U8)
                        memset(m_buffer->getBuffer(), 0x80, length*samplesize);
                  else
                        memset(m_buffer->getBuffer(), 0, length*samplesize);
                  m_remdelay -= length;
            }
            buffer = m_buffer->getBuffer();
      }
      else
            m_reader->read(length, buffer);
}

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