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/* Goom Project
* Copyright (C) <2003> iOS-Software
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "sound_tester.h"
#include <stdlib.h>
#include <string.h>
/* some constants */
#define BIG_GOOM_DURATION 100
#define BIG_GOOM_SPEED_LIMIT 0.1f
#define ACCEL_MULT 0.95f
#define SPEED_MULT 0.99f
void
evaluate_sound (gint16 data[2][512], SoundInfo * info)
{
int i;
float difaccel;
float prevspeed;
/* find the max */
int incvar = 0;
for (i = 0; i < 512; i += 2) {
if (incvar < data[0][i])
incvar = data[0][i];
}
if (incvar > info->allTimesMax)
info->allTimesMax = incvar;
/* volume sonore */
info->volume = (float) incvar / (float) info->allTimesMax;
memcpy (info->samples[0], data[0], 512 * sizeof (short));
memcpy (info->samples[1], data[1], 512 * sizeof (short));
difaccel = info->accelvar;
info->accelvar = info->volume; /* accel entre 0 et 1 */
/* transformations sur la vitesse du son */
if (info->speedvar > 1.0f)
info->speedvar = 1.0f;
if (info->speedvar < 0.1f)
info->accelvar *= (1.0f - (float) info->speedvar);
else if (info->speedvar < 0.3f)
info->accelvar *= (0.9f - (float) (info->speedvar - 0.1f) / 2.0f);
else
info->accelvar *= (0.8f - (float) (info->speedvar - 0.3f) / 4.0f);
/* adoucissement de l'acceleration */
info->accelvar *= ACCEL_MULT;
if (info->accelvar < 0)
info->accelvar = 0;
difaccel = info->accelvar - difaccel;
if (difaccel < 0)
difaccel = -difaccel;
/* mise a jour de la vitesse */
prevspeed = info->speedvar;
info->speedvar = (info->speedvar + difaccel * 0.5f) / 2;
info->speedvar *= SPEED_MULT;
info->speedvar = (info->speedvar + 3.0f * prevspeed) / 4.0f;
if (info->speedvar < 0)
info->speedvar = 0;
if (info->speedvar > 1)
info->speedvar = 1;
/* temps du goom */
info->timeSinceLastGoom++;
info->timeSinceLastBigGoom++;
info->cycle++;
/* detection des nouveaux gooms */
if ((info->speedvar > (float) IVAL (info->biggoom_speed_limit_p) / 100.0f)
&& (info->accelvar > info->bigGoomLimit)
&& (info->timeSinceLastBigGoom > BIG_GOOM_DURATION)) {
info->timeSinceLastBigGoom = 0;
}
if (info->accelvar > info->goom_limit) {
/* TODO: tester && (info->timeSinceLastGoom > 20)) { */
info->totalgoom++;
info->timeSinceLastGoom = 0;
info->goomPower = info->accelvar - info->goom_limit;
}
if (info->accelvar > info->prov_max)
info->prov_max = info->accelvar;
if (info->goom_limit > 1)
info->goom_limit = 1;
/* toute les 2 secondes : v�rifier si le taux de goom est correct
* et le modifier sinon.. */
if (info->cycle % 64 == 0) {
if (info->speedvar < 0.01f)
info->goom_limit *= 0.91;
if (info->totalgoom > 4) {
info->goom_limit += 0.02;
}
if (info->totalgoom > 7) {
info->goom_limit *= 1.03f;
info->goom_limit += 0.03;
}
if (info->totalgoom > 16) {
info->goom_limit *= 1.05f;
info->goom_limit += 0.04;
}
if (info->totalgoom == 0) {
info->goom_limit = info->prov_max - 0.02;
}
if ((info->totalgoom == 1) && (info->goom_limit > 0.02))
info->goom_limit -= 0.01;
info->totalgoom = 0;
info->bigGoomLimit =
info->goom_limit * (1.0f +
(float) IVAL (info->biggoom_factor_p) / 500.0f);
info->prov_max = 0;
}
/* mise a jour des parametres pour la GUI */
FVAL (info->volume_p) = info->volume;
info->volume_p.change_listener (&info->volume_p);
FVAL (info->speed_p) = info->speedvar * 4;
info->speed_p.change_listener (&info->speed_p);
FVAL (info->accel_p) = info->accelvar;
info->accel_p.change_listener (&info->accel_p);
FVAL (info->goom_limit_p) = info->goom_limit;
info->goom_limit_p.change_listener (&info->goom_limit_p);
FVAL (info->goom_power_p) = info->goomPower;
info->goom_power_p.change_listener (&info->goom_power_p);
FVAL (info->last_goom_p) = 1.0 - ((float) info->timeSinceLastGoom / 20.0f);
info->last_goom_p.change_listener (&info->last_goom_p);
FVAL (info->last_biggoom_p) =
1.0 - ((float) info->timeSinceLastBigGoom / 40.0f);
info->last_biggoom_p.change_listener (&info->last_biggoom_p);
/* bigGoomLimit ==goomLimit*9/8+7 ? */
}
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