/***************************************************************************
* 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()
{
int converter_type_array[] = {SRC_SINC_BEST_QUALITY, SRC_SINC_MEDIUM_QUALITY, SRC_SINC_FASTEST,
SRC_ZERO_ORDER_HOLD, SRC_LINEAR};
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;
}
void SRConverter::applyEffect(Buffer *b)
{
if (m_src_state && b->nbytes > 0)
{
m_src_data.input_frames = b->nbytes / 2 / channels();
m_src_data.data_in = new float [m_src_data.input_frames * channels()];
m_src_data.output_frames = m_src_data.src_ratio * m_src_data.input_frames + 1;
m_src_data.end_of_input = 0;
m_src_data.data_out = new float [m_src_data.output_frames * channels()];
src_short_to_float_array((short*) b->data, m_src_data.data_in,
m_src_data.input_frames * channels());
if ((m_srcError = src_process(m_src_state, &m_src_data)) > 0)
{
qWarning("SRConverter: src_process(): %s\n", src_strerror(m_srcError));
}
else
{
qint16 *out_data = new qint16 [m_src_data.output_frames_gen * channels()];
src_float_to_short_array(m_src_data.data_out, out_data,
m_src_data.output_frames_gen*channels());
b->nbytes = m_src_data.output_frames_gen * channels() * 2;
if(b->nbytes > b->size)
{
delete [] b->data;
b->data = (uchar *) out_data;
}
else
{
memcpy(b->data, out_data, b->nbytes);
delete [] out_data;
}
}
delete [] m_src_data.data_in;
delete [] m_src_data.data_out;
}
}
void SRConverter::configure(quint32 freq, int chan, Qmmp::AudioFormat format)
{
freeSRC();
if(freq != m_overSamplingFs)
{
m_src_state = src_new(m_converter_type, chan, &m_srcError);
if (m_src_state)
{
m_src_data.src_ratio = (float)m_overSamplingFs/(float)freq;
src_set_ratio(m_src_state, m_src_data.src_ratio);
}
else
qDebug("SRConverter: src_new(): %s", src_strerror(m_srcError));
}
Effect::configure(m_overSamplingFs, chan, format);
}
void SRConverter::freeSRC()
{
if (m_src_state)
m_src_state = src_delete(m_src_state);
m_src_state = 0;
}
