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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* Copyright 2009-2011 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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Audaspace; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file audaspace/FX/AUD_LoopReader.cpp
* \ingroup audfx
*/
#include "AUD_LoopReader.h"
#include "AUD_Buffer.h"
#include <cstring>
AUD_LoopReader::AUD_LoopReader(boost::shared_ptr<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, bool& eos, sample_t* buffer)
{
const AUD_Specs specs = m_reader->getSpecs();
int len = length;
m_reader->read(length, eos, buffer);
if(length < len && eos && m_left)
{
int pos = length;
length = len;
while(pos < length && eos && m_left)
{
if(m_left > 0)
m_left--;
m_reader->seek(0);
len = length - pos;
m_reader->read(len, eos, buffer + pos * specs.channels);
// prevent endless loop
if(!len)
break;
pos += len;
}
length = pos;
}
}
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