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/*
* $Id$
*
* ***** 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/SRC/AUD_SRCResampleReader.cpp
* \ingroup audsrc
*/
#include "AUD_SRCResampleReader.h"
#include <cmath>
#include <cstring>
#include <cstdio>
static long src_callback(void *cb_data, float **data)
{
return ((AUD_SRCResampleReader*)cb_data)->doCallback(data);
}
static const char* state_error = "AUD_SRCResampleReader: SRC State couldn't be "
"created.";
AUD_SRCResampleReader::AUD_SRCResampleReader(AUD_Reference<AUD_IReader> reader,
AUD_Specs specs) :
AUD_EffectReader(reader),
m_sspecs(reader->getSpecs()),
m_factor(double(specs.rate) / double(m_sspecs.rate)),
m_tspecs(specs),
m_position(0)
{
m_tspecs.channels = m_sspecs.channels;
int error;
m_src = src_callback_new(src_callback,
SRC_SINC_MEDIUM_QUALITY,
m_sspecs.channels,
&error,
this);
if(!m_src)
{
// XXX printf("%s\n", src_strerror(error));
AUD_THROW(AUD_ERROR_SRC, state_error);
}
}
AUD_SRCResampleReader::~AUD_SRCResampleReader()
{
src_delete(m_src);
}
long AUD_SRCResampleReader::doCallback(float** data)
{
int length = m_buffer.getSize() / AUD_SAMPLE_SIZE(m_tspecs);
sample_t* buffer;
m_reader->read(length, buffer);
*data = buffer;
return length;
}
void AUD_SRCResampleReader::seek(int position)
{
m_reader->seek(position / m_factor);
src_reset(m_src);
m_position = position;
}
int AUD_SRCResampleReader::getLength() const
{
return m_reader->getLength() * m_factor;
}
int AUD_SRCResampleReader::getPosition() const
{
return m_position;
}
AUD_Specs AUD_SRCResampleReader::getSpecs() const
{
return m_tspecs;
}
void AUD_SRCResampleReader::read(int & length, sample_t* & buffer)
{
int size = length * AUD_SAMPLE_SIZE(m_tspecs);
if(m_buffer.getSize() < size)
m_buffer.resize(size);
buffer = m_buffer.getBuffer();
length = src_callback_read(m_src, m_factor, length, buffer);
m_position += length;
}
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