gstreamer/gst/goom/sound_tester.c

/* 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., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, 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 ? */
}