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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_loop(loop)
{
m_samples = -1;
m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
}
AUD_LoopReader::~AUD_LoopReader()
{
delete m_buffer; AUD_DELETE("buffer")
}
AUD_ReaderType AUD_LoopReader::getType()
{
if(m_loop < 0)
return AUD_TYPE_STREAM;
return m_reader->getType();
}
bool AUD_LoopReader::notify(AUD_Message &message)
{
if(message.type == AUD_MSG_LOOP)
{
m_loop = message.loopcount;
m_samples = message.time * m_reader->getSpecs().rate;
m_reader->notify(message);
return true;
}
return m_reader->notify(message);
}
void AUD_LoopReader::read(int & length, sample_t* & buffer)
{
AUD_Specs specs = m_reader->getSpecs();
int samplesize = AUD_SAMPLE_SIZE(specs);
if(m_samples >= 0)
{
if(length > m_samples)
length = m_samples;
m_samples -= length;
}
int len = length;
m_reader->read(len, buffer);
if(len < length && m_loop != 0)
{
int pos = 0;
if(m_buffer->getSize() < length * samplesize)
m_buffer->resize(length * samplesize);
memcpy(m_buffer->getBuffer() + pos * specs.channels,
buffer, len * samplesize);
pos += len;
while(pos < length && m_loop != 0)
{
if(m_loop > 0)
m_loop--;
m_reader->seek(0);
len = length - pos;
m_reader->read(len, buffer);
// prevent endless loop
if(!len)
break;
memcpy(m_buffer->getBuffer() + pos * specs.channels,
buffer, len * samplesize);
pos += len;
}
length = pos;
buffer = m_buffer->getBuffer();
}
else
length = len;
}
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