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/*
* $Id$
*
* ***** 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_LoopReader.h"
#include "AUD_Buffer.h"
#include <cstring>
AUD_LoopReader::AUD_LoopReader(AUD_IReader* reader, int loop) :
AUD_EffectReader(reader), m_count(loop), m_left(loop)
{
}
void AUD_LoopReader::seek(int position)
{
int len = m_reader->getLength();
if(len < 0)
m_reader->seek(position);
else
{
if(m_count >= 0)
{
m_left = m_count - (position / len);
if(m_left < 0)
m_left = 0;
}
m_reader->seek(position % len);
}
}
int AUD_LoopReader::getLength() const
{
if(m_count < 0)
return -1;
return m_reader->getLength() * m_count;
}
int AUD_LoopReader::getPosition() const
{
return m_reader->getPosition() * (m_count < 0 ? 1 : m_count);
}
void AUD_LoopReader::read(int & length, sample_t* & buffer)
{
AUD_Specs specs = m_reader->getSpecs();
int samplesize = AUD_SAMPLE_SIZE(specs);
int len = length;
m_reader->read(len, buffer);
if(len < length && m_left)
{
int pos = 0;
if(m_buffer.getSize() < length * samplesize)
m_buffer.resize(length * samplesize);
sample_t* buf = m_buffer.getBuffer();
memcpy(buf + pos * specs.channels, buffer, len * samplesize);
pos += len;
while(pos < length && m_left)
{
if(m_left > 0)
m_left--;
m_reader->seek(0);
len = length - pos;
m_reader->read(len, buffer);
// prevent endless loop
if(!len)
break;
memcpy(buf + pos * specs.channels, buffer, len * samplesize);
pos += len;
}
length = pos;
buffer = buf;
}
else
length = len;
}
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