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api8/src/audio.c

69 lines
1.8 KiB
C

#include "../includes/audio.h"
// Stocke les données à propos de la musique
static double average;
// Channel son utilisé
static int _channel;
// Code utilisé en tant qu'erreur de SDL_Mixer
static int _errStatus = 2;
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 / 100.));
}
void initMusic(Mix_Chunk *music, const char *filename) {
if (!Mix_Init(MIX_INIT_MID)) {
fprintf(stderr, "Erreur Mix_Init - Chargement des librairies dynamiques\n");
exit(_errStatus);
}
if (!Mix_GetSoundFonts()) {
fprintf(stderr,
"Aucun soundfonts, mettez les dans /usr/share/sounds/sf2\n");
fprintf(stderr,
"S'ils sont dans /usr/share/soundfonts, "
"vous pouvez faire :\n"
"sudo mkdir -p /usr/share/sounds/sf2 && "
"sudo ln -s /usr/share/soundfonts/*.sf2 /usr/share/sounds/sf2/\n");
exit(_errStatus);
}
if (Mix_OpenAudio(MIX_DEFAULT_FREQUENCY, MIX_DEFAULT_FORMAT, 1, 2048)) {
fprintf(stderr, "Erreur Mix_OpenAudio\n");
exit(_errStatus);
};
if (!(music = Mix_LoadWAV(filename))) {
fprintf(stderr, "Erreur Mix_LoadWAV en chargant '%s'\n", filename);
exit(_errStatus);
}
Mix_SetPostMix(callback, NULL);
if ((_channel = Mix_PlayChannel(-1, music, -1)) == -1) {
fprintf(stderr, "Erreur Mix_PlayChannel - Le son n'as pas pu être joué\n");
exit(_errStatus);
};
}
void freeMusic(Mix_Chunk *music) {
if (music) {
if (Mix_Playing(_channel)) {
Mix_HaltChannel(_channel);
}
Mix_FreeChunk(music);
music = NULL;
}
Mix_CloseAudio();
Mix_Quit();
}