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161 lines
4.8 KiB
C
161 lines
4.8 KiB
C
/* Goom Project
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* Copyright (C) <2003> iOS-Software
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "sound_tester.h"
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#include <stdlib.h>
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#include <string.h>
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/* some constants */
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#define BIG_GOOM_DURATION 100
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#define BIG_GOOM_SPEED_LIMIT 0.1f
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#define ACCEL_MULT 0.95f
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#define SPEED_MULT 0.99f
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void
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evaluate_sound (gint16 data[2][512], SoundInfo * info)
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{
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int i;
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float difaccel;
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float prevspeed;
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/* find the max */
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int incvar = 0;
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for (i = 0; i < 512; i += 2) {
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if (incvar < data[0][i])
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incvar = data[0][i];
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}
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if (incvar > info->allTimesMax)
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info->allTimesMax = incvar;
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/* volume sonore */
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info->volume = (float) incvar / (float) info->allTimesMax;
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memcpy (info->samples[0], data[0], 512 * sizeof (short));
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memcpy (info->samples[1], data[1], 512 * sizeof (short));
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difaccel = info->accelvar;
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info->accelvar = info->volume; /* accel entre 0 et 1 */
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/* transformations sur la vitesse du son */
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if (info->speedvar > 1.0f)
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info->speedvar = 1.0f;
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if (info->speedvar < 0.1f)
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info->accelvar *= (1.0f - (float) info->speedvar);
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else if (info->speedvar < 0.3f)
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info->accelvar *= (0.9f - (float) (info->speedvar - 0.1f) / 2.0f);
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else
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info->accelvar *= (0.8f - (float) (info->speedvar - 0.3f) / 4.0f);
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/* adoucissement de l'acceleration */
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info->accelvar *= ACCEL_MULT;
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if (info->accelvar < 0)
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info->accelvar = 0;
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difaccel = info->accelvar - difaccel;
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if (difaccel < 0)
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difaccel = -difaccel;
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/* mise a jour de la vitesse */
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prevspeed = info->speedvar;
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info->speedvar = (info->speedvar + difaccel * 0.5f) / 2;
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info->speedvar *= SPEED_MULT;
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info->speedvar = (info->speedvar + 3.0f * prevspeed) / 4.0f;
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if (info->speedvar < 0)
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info->speedvar = 0;
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if (info->speedvar > 1)
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info->speedvar = 1;
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/* temps du goom */
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info->timeSinceLastGoom++;
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info->timeSinceLastBigGoom++;
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info->cycle++;
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/* detection des nouveaux gooms */
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if ((info->speedvar > (float) IVAL (info->biggoom_speed_limit_p) / 100.0f)
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&& (info->accelvar > info->bigGoomLimit)
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&& (info->timeSinceLastBigGoom > BIG_GOOM_DURATION)) {
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info->timeSinceLastBigGoom = 0;
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}
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if (info->accelvar > info->goom_limit) {
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/* TODO: tester && (info->timeSinceLastGoom > 20)) { */
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info->totalgoom++;
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info->timeSinceLastGoom = 0;
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info->goomPower = info->accelvar - info->goom_limit;
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}
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if (info->accelvar > info->prov_max)
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info->prov_max = info->accelvar;
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if (info->goom_limit > 1)
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info->goom_limit = 1;
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/* toute les 2 secondes : v<>rifier si le taux de goom est correct
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* et le modifier sinon.. */
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if (info->cycle % 64 == 0) {
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if (info->speedvar < 0.01f)
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info->goom_limit *= 0.91;
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if (info->totalgoom > 4) {
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info->goom_limit += 0.02;
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}
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if (info->totalgoom > 7) {
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info->goom_limit *= 1.03f;
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info->goom_limit += 0.03;
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}
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if (info->totalgoom > 16) {
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info->goom_limit *= 1.05f;
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info->goom_limit += 0.04;
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}
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if (info->totalgoom == 0) {
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info->goom_limit = info->prov_max - 0.02;
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}
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if ((info->totalgoom == 1) && (info->goom_limit > 0.02))
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info->goom_limit -= 0.01;
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info->totalgoom = 0;
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info->bigGoomLimit =
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info->goom_limit * (1.0f +
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(float) IVAL (info->biggoom_factor_p) / 500.0f);
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info->prov_max = 0;
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}
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/* mise a jour des parametres pour la GUI */
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FVAL (info->volume_p) = info->volume;
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info->volume_p.change_listener (&info->volume_p);
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FVAL (info->speed_p) = info->speedvar * 4;
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info->speed_p.change_listener (&info->speed_p);
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FVAL (info->accel_p) = info->accelvar;
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info->accel_p.change_listener (&info->accel_p);
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FVAL (info->goom_limit_p) = info->goom_limit;
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info->goom_limit_p.change_listener (&info->goom_limit_p);
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FVAL (info->goom_power_p) = info->goomPower;
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info->goom_power_p.change_listener (&info->goom_power_p);
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FVAL (info->last_goom_p) = 1.0 - ((float) info->timeSinceLastGoom / 20.0f);
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info->last_goom_p.change_listener (&info->last_goom_p);
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FVAL (info->last_biggoom_p) =
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1.0 - ((float) info->timeSinceLastBigGoom / 40.0f);
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info->last_biggoom_p.change_listener (&info->last_biggoom_p);
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/* bigGoomLimit ==goomLimit*9/8+7 ? */
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}
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