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/*******************************************************************************
* Copyright 2009-2016 Jörg Müller
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
#include "fx/LoopReader.h"
#include <cstring>
AUD_NAMESPACE_BEGIN
LoopReader::LoopReader(std::shared_ptr<IReader> reader, int loop) :
EffectReader(reader), m_count(loop), m_left(loop)
{
}
void 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 LoopReader::getLength() const
{
if(m_count < 0)
return -1;
return m_reader->getLength() * m_count;
}
int LoopReader::getPosition() const
{
return m_reader->getPosition() * (m_count < 0 ? 1 : m_count);
}
void LoopReader::read(int& length, bool& eos, sample_t* buffer)
{
const 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;
}
}
AUD_NAMESPACE_END
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