api8/src/audio.c

#include "../includes/audio.h"
#include <stdio.h>

// Stocke les données à propos de la musique
static double average;

double averageMusic(void) { return average; }

void callback(void *_, Uint8 *stream, int size) {
  int i = 0;
  double tmp = 0.;
  for (signed short *stream16 = (signed short *)stream; i < size / 2; ++i) {
    tmp += stream16[i] / ((1 << 15) - 1.);
  }
  average = fabs(tmp / i);
}

void initMusic(Mix_Music *music, const char *filename) {
  Mix_Init(MIX_INIT_MID);
  if (Mix_OpenAudio(MIX_DEFAULT_FREQUENCY, MIX_DEFAULT_FORMAT, 1, 2048)) {
    fprintf(stderr, "Erreur Mix_OpenAudio\n");
    exit(2);
  };

  if (!(music = Mix_LoadMUS(filename))) {
    fprintf(stderr, "Erreur Mix_LoadMUS for '%s'\n", filename);
    exit(2);
  }

  Mix_VolumeMusic(MIX_MAX_VOLUME / 10);
  Mix_SetPostMix(callback, NULL);

  if (Mix_PlayMusic(music, -1)) {
    fprintf(stderr, "Erreur Mix_PlayMusic\n");
    exit(2);
  };
}

void freeMusic(Mix_Music *music) {
  if (music) {
    if (Mix_PlayingMusic()) {
      Mix_HaltMusic();
    }
    Mix_FreeMusic(music);
    music = NULL;
  }

  Mix_CloseAudio();
  Mix_Quit();
}