/***************************************************************************
* Copyright (C) 2007 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 <QDir>
#include <math.h>
#include <stdlib.h>
#include "srconverter.h"
SRConverter::SRConverter(QObject* parent) : Effect(parent)
{
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(QDir::homePath()+"/.qmmp/qmmprc", 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)
{
free(m_srcIn);
free(m_srcOut);
free(m_wOut);
m_isSrcAlloc = FALSE;
}
}
const ulong SRConverter::process(char *in_data, const ulong size, char **out_data)
{
if (m_isSrcAlloc)
{
free(m_srcIn);
free(m_srcOut);
free(m_wOut);
m_isSrcAlloc = FALSE;
}
ulong wbytes = 0;
if (m_src_state && size > 0)
{
int lrLength = size/2;
int overLrLength= (int)floor(lrLength*(m_src_data.src_ratio+1));
m_srcIn = (float*) malloc(sizeof(float)*lrLength);
m_srcOut = (float*) malloc(sizeof(float)*overLrLength);
m_wOut = (short int*) malloc(sizeof(short int)*overLrLength);
src_short_to_float_array((short int*)in_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;
*out_data = new char[wbytes];
memcpy(*out_data, (char*) m_wOut, wbytes);
}
}
return wbytes;
}
void SRConverter::configure(ulong freq, int chan, int res)
{
Effect::configure(freq, chan, res);
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));
}
}
const ulong SRConverter::frequency()
{
return m_overSamplingFs;
}
void SRConverter::freeSRC()
{
if (m_src_state != NULL)
m_src_state = src_delete(m_src_state);
}
