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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_DelayReader.cpp
* \ingroup audfx
*/
#include "AUD_DelayReader.h"
#include <cstring>
AUD_DelayReader::AUD_DelayReader(boost::shared_ptr<AUD_IReader> reader, float delay) :
AUD_EffectReader(reader),
m_delay(int((AUD_SampleRate)delay * reader->getSpecs().rate)),
m_remdelay(int((AUD_SampleRate)delay * reader->getSpecs().rate))
{
}
void AUD_DelayReader::seek(int position)
{
if(position < m_delay)
{
m_remdelay = m_delay - position;
m_reader->seek(0);
}
else
{
m_remdelay = 0;
m_reader->seek(position - m_delay);
}
}
int AUD_DelayReader::getLength() const
{
int len = m_reader->getLength();
if(len < 0)
return len;
return len + m_delay;
}
int AUD_DelayReader::getPosition() const
{
if(m_remdelay > 0)
return m_delay - m_remdelay;
return m_reader->getPosition() + m_delay;
}
void AUD_DelayReader::read(int& length, bool& eos, sample_t* buffer)
{
if(m_remdelay > 0)
{
AUD_Specs specs = m_reader->getSpecs();
int samplesize = AUD_SAMPLE_SIZE(specs);
if(length > m_remdelay)
{
memset(buffer, 0, m_remdelay * samplesize);
int len = length - m_remdelay;
m_reader->read(len, eos, buffer + m_remdelay * specs.channels);
length = m_remdelay + len;
m_remdelay = 0;
}
else
{
memset(buffer, 0, length * samplesize);
m_remdelay -= length;
}
}
else
m_reader->read(length, eos, buffer);
}
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