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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_LimiterReader.h"
#include "AUD_Buffer.h"
#include <iostream>
AUD_LimiterReader::AUD_LimiterReader(AUD_IReader* reader,
float start, float end) :
AUD_EffectReader(reader),
m_start(int(start * reader->getSpecs().rate)),
m_end(int(end * reader->getSpecs().rate))
{
if(m_start > 0)
{
if(m_reader->isSeekable())
m_reader->seek(m_start);
else
{
// skip first m_start samples by reading them
int length = AUD_DEFAULT_BUFFER_SIZE;
sample_t* buffer;
for(int len = m_start;
length == AUD_DEFAULT_BUFFER_SIZE;
len -= AUD_DEFAULT_BUFFER_SIZE)
{
if(len < AUD_DEFAULT_BUFFER_SIZE)
length = len;
m_reader->read(length, buffer);
}
}
}
}
void AUD_LimiterReader::seek(int position)
{
m_reader->seek(position + m_start);
}
int AUD_LimiterReader::getLength() const
{
int len = m_reader->getLength();
if(len < 0 || (len > m_end && m_end >= 0))
len = m_end;
return len - m_start;
}
int AUD_LimiterReader::getPosition() const
{
int pos = m_reader->getPosition();
return AUD_MIN(pos, m_end) - m_start;
}
void AUD_LimiterReader::read(int & length, sample_t* & buffer)
{
if(m_end >= 0)
{
int position = m_reader->getPosition();
if(position + length > m_end)
length = m_end - position;
if(length < 0)
{
length = 0;
return;
}
}
m_reader->read(length, buffer);
}
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