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/***************************************************************************
* Copyright (C) 2007-2010 by Ilya Kotov *
* forkotov02@hotmail.ru *
* *
* This program 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. *
* *
* This program 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 this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <QSettings>
#include <math.h>
#include <stdlib.h>
#include <qmmp/qmmp.h>
#include "srconverter.h"
SRConverter::SRConverter() : Effect()
{
m_isSrcAlloc = FALSE;
int converter_type_array[] = {SRC_SINC_BEST_QUALITY, SRC_SINC_MEDIUM_QUALITY, SRC_SINC_FASTEST,
SRC_ZERO_ORDER_HOLD, SRC_LINEAR};
m_srcIn = 0;
m_srcOut = 0;
m_src_state = 0;
m_srcError = 0;
QSettings settings(Qmmp::configFile(), QSettings::IniFormat);
m_overSamplingFs = settings.value("SRC/sample_rate",48000).toInt();
m_converter_type = converter_type_array[settings.value("SRC/engine", 0).toInt()];
}
SRConverter::~SRConverter()
{
src_reset (m_src_state) ;
freeSRC();
m_src_data.data_in = 0;
m_src_data.data_out = 0;
m_src_data.end_of_input = 0;
m_src_data.input_frames = 0;
m_src_data.output_frames = 0;
if (m_isSrcAlloc)
{
delete [] m_srcIn;
delete [] m_srcOut;
delete [] m_wOut;
m_isSrcAlloc = FALSE;
}
}
void SRConverter::applyEffect(Buffer *b)
{
if (m_isSrcAlloc)
{
delete [] m_srcIn;
delete [] m_srcOut;
delete [] m_wOut;
m_isSrcAlloc = FALSE;
}
ulong wbytes = 0;
if (m_src_state && b->nbytes > 0)
{
int lrLength = b->nbytes/2;
int overLrLength= (int)floor(lrLength*(m_src_data.src_ratio+1));
m_srcIn = new float [lrLength];
m_srcOut = new float [overLrLength];
m_wOut = new short[overLrLength];
src_short_to_float_array((short *)b->data, m_srcIn, lrLength);
m_isSrcAlloc = true;
m_src_data.data_in = m_srcIn;
m_src_data.data_out = m_srcOut;
m_src_data.end_of_input = 0;
m_src_data.input_frames = lrLength/2;
m_src_data.output_frames = overLrLength/2;
if ((m_srcError = src_process(m_src_state, &m_src_data)) > 0)
{
qWarning("SRConverter: src_process(): %s\n", src_strerror(m_srcError));
}
else
{
src_float_to_short_array(m_srcOut, m_wOut, m_src_data.output_frames_gen*2);
wbytes = m_src_data.output_frames_gen*4;
delete [] b->data;
b->data = (unsigned char *) m_wOut;
b->nbytes = wbytes;
m_wOut = 0;
}
}
}
void SRConverter::configure(quint32 freq, int chan, Qmmp::AudioFormat format)
{
freeSRC();
uint rate = freq;
{
m_src_state = src_new(m_converter_type, 2, &m_srcError);
if (m_src_state)
{
m_src_data.src_ratio = (float)m_overSamplingFs/(float)rate;
rate = m_overSamplingFs;
}
else
qDebug("SRConverter: src_new(): %s", src_strerror(m_srcError));
}
Effect::configure(m_overSamplingFs, chan, format);
}
void SRConverter::freeSRC()
{
if (m_src_state != NULL)
m_src_state = src_delete(m_src_state);
}
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