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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_LimiterReader.cpp
* \ingroup audfx
*/
#include "AUD_LimiterReader.h"
#include "AUD_Buffer.h"
AUD_LimiterReader::AUD_LimiterReader(boost::shared_ptr<AUD_IReader> reader,
float start, float end) :
AUD_EffectReader(reader),
m_start(start),
m_end(end)
{
if(m_start > 0)
{
AUD_Specs specs = m_reader->getSpecs();
AUD_Specs specs2;
if(m_reader->isSeekable())
m_reader->seek(m_start * specs.rate);
else
{
// skip first m_start samples by reading them
int length = AUD_DEFAULT_BUFFER_SIZE;
AUD_Buffer buffer(AUD_DEFAULT_BUFFER_SIZE * AUD_SAMPLE_SIZE(specs));
bool eos = false;
for(int len = m_start * specs.rate;
length > 0 && !eos;
len -= length)
{
if(len < AUD_DEFAULT_BUFFER_SIZE)
length = len;
m_reader->read(length, eos, buffer.getBuffer());
specs2 = m_reader->getSpecs();
if(specs2.rate != specs.rate)
{
len = len * specs2.rate / specs.rate;
specs.rate = specs2.rate;
}
if(specs2.channels != specs.channels)
{
specs = specs2;
buffer.assureSize(AUD_DEFAULT_BUFFER_SIZE * AUD_SAMPLE_SIZE(specs));
}
}
}
}
}
void AUD_LimiterReader::seek(int position)
{
m_reader->seek(position + m_start * m_reader->getSpecs().rate);
}
int AUD_LimiterReader::getLength() const
{
int len = m_reader->getLength();
AUD_SampleRate rate = m_reader->getSpecs().rate;
if(len < 0 || (len > m_end * rate && m_end >= 0))
len = m_end * rate;
return len - m_start * rate;
}
int AUD_LimiterReader::getPosition() const
{
int pos = m_reader->getPosition();
AUD_SampleRate rate = m_reader->getSpecs().rate;
return AUD_MIN(pos, m_end * rate) - m_start * rate;
}
void AUD_LimiterReader::read(int& length, bool& eos, sample_t* buffer)
{
eos = false;
if(m_end >= 0)
{
int position = m_reader->getPosition();
AUD_SampleRate rate = m_reader->getSpecs().rate;
if(position + length > m_end * rate)
{
length = m_end * rate - position;
eos = true;
}
if(position < int(m_start * rate))
{
int len2 = length;
for(int len = int(m_start * rate) - position;
len2 == length && !eos;
len -= length)
{
if(len < length)
len2 = len;
m_reader->read(len2, eos, buffer);
position += len2;
}
if(position < m_start * rate)
{
length = 0;
return;
}
}
if(length < 0)
{
length = 0;
return;
}
}
if(eos)
{
m_reader->read(length, eos, buffer);
eos = true;
}
else
m_reader->read(length, eos, buffer);
}
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