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/* Libvisual-plugins - Standard plugins for libvisual
*
* Copyright (C) 2000, 2001 Remi Arquier <arquier@crans.org>
*
* Authors: Remi Arquier <arquier@crans.org>
* Dennis Smit <ds@nerds-incorporated.org>
*
* $Id: analyser.c,v 1.6 2006/01/30 19:06:46 synap Exp $
*
* 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 <sys/time.h>
#include <stdlib.h>
#include "struct.h"
#include "analyser_struct.h"
#include "analyser.h"
#include "def.h"
#include "jess.h"
int detect_beat(JessPrivate *priv)
{
if ((priv->lys.E / priv->lys.E_moyen > LEVEL_ONE))
{
priv->lys.beat = OUI;
}
return 0;
}
/* Energie discrete moyenne temporellie*/
void spectre_moyen(JessPrivate *priv, short data_freq_tmp[2][256])
{
int i;
float aux,N;
N = T_AVERAGE_SPECTRAL;
for (i=0 ; i<256 ; i++)
{
aux = (float) (data_freq_tmp[0][i] + data_freq_tmp[1][i]) * 0.5 / 65536;
aux = aux * aux;
priv->lys.Ed_moyen[i] = (N - 1.0) / N * priv->lys.Ed_moyen[i] + 1.0 / N * aux;
if (aux / priv->lys.Ed_moyen[i] > 9) /* discret beat */
priv->lys.dbeat[i] = OUI;
}
}
/* Derivee temporelle de l'energie moyenne */
/* Doit etre appelle apres C_E_moyen */
void C_dEdt_moyen(JessPrivate *priv)
{
float new, N;
N = T_AVERAGE_DEDT;
new = (priv->lys.E_moyen - priv->E_old1) / priv->lys.dt;
priv->lys.dEdt_moyen = (N - 1.0) / N * priv->lys.dEdt_moyen + 1.0 / N * new;
priv->E_old1 = priv->lys.E_moyen;
}
void C_dEdt(JessPrivate *priv)
{
float new, N;
N = T_DEDT; /* on met un petit filtre qd meme */
new = (priv->lys.E_moyen - priv->E_old2) / priv->lys.dt;
priv->lys.dEdt = (N - 1.0) / N * priv->lys.dEdt_moyen + 1.0 / N * new;
priv->E_old2 = priv->lys.E_moyen;
}
/* Energie moyenne temporelle */
void C_E_moyen(JessPrivate *priv, short data_freq_tmp[2][256])
{
float N;
N = T_AVERAGE_E;
priv->lys.E_moyen = (N - 1.0) / N * priv->lys.E_moyen + 1.0 / N * energy(priv, data_freq_tmp,1);
}
/* Energie courante */
float energy(JessPrivate *priv, short data_freq_tmp[2][256], int type_E)
{
int i, tmp;
float energy_ = 0;
for (i = 0; i < 256; i++) {
tmp = ( data_freq_tmp[1][i] ) >> 8 ;
energy_+= tmp * tmp ;
}
energy_ = energy_ / 65536 / 256 * 256; /*ahahah*/ /* synap: Yes, indeed */
priv->lys.E = energy_;
return energy_;
}
/* TICK REPLACEMENT */
int start_ticks(JessPrivate *priv)
{
gettimeofday(&priv->start, NULL);
return 0;
}
int get_ticks(JessPrivate *priv)
{
struct timeval now;
int ticks;
gettimeofday(&now, NULL);
ticks = (now.tv_sec - priv->start.tv_sec) * 1000 +
(now.tv_usec - priv->start.tv_usec) / 1000;
return ticks;
}
/* REINIT */
float time_last(JessPrivate *priv, int i, int reinit)
{
float new_time = get_ticks(priv);
float delta_t;
delta_t = (new_time - priv->lys.last_time[i]) / 1000;
if (reinit == OUI)
priv->lys.last_time[i] = new_time;
return delta_t;
}
void ips(JessPrivate *priv)
{
priv->conteur.dt = time_last(priv, FOUR, NON);
priv->conteur.fps = (int) 1 / time_last(priv, FOUR, REINIT);
}
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