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#define MINIMP3_FLOAT_OUTPUT
#define MINIMP3_IMPLEMENTATION
#include <stdio.h>
#include <minimp3_ex.h>
#include <mossrose.h>
#include "load.h"
#define ABORT(...) do { \
fprintf(stderr, __VA_ARGS__); \
free(mp3.buffer); \
return NULL; \
} while(0)
struct mossrose_sound_t * load_mp3(const char *filename)
{
mp3dec_t mp3d;
mp3dec_file_info_t mp3;
if (mp3dec_load(&mp3d, filename, &mp3, NULL, NULL)) {
fprintf(stderr, "failed to decode mp3 file '%s'\n", filename);
return NULL;
}
if (mp3.channels != 1 && mp3.channels != 2) {
ABORT("files with %d audio tracks are not supported!\n", mp3.channels);
}
struct mossrose_sound_t *sound = malloc(sizeof(struct mossrose_sound_t));
if (sound == NULL)
ABORT("failed to allocate sound structure\n");
if (mp3.channels == 1) {
sound->mono = true;
sound->left = malloc(mp3.samples * sizeof(float));
if (sound->left == NULL) {
free(sound);
ABORT("failed to allocate mono audio data!\n");
}
memcpy(sound->left, mp3.buffer, mp3.samples * sizeof(float));
sound->right = NULL;
sound->len = mp3.samples;
}
else {
/* stereo */
sound->mono = false;
size_t sz = (mp3.samples/2) * sizeof(float);
sound->left = malloc(sz);
if (sound->left == NULL) {
free(sound);
ABORT("failed to allocate left audio channel!\n");
}
sound->right = malloc(sz);
if (sound->right == NULL) {
free(sound->left);
free(sound);
ABORT("failed to allocate right audio channel!\n");
}
for (int i=0; i<mp3.samples; i++) {
if (i%2)
sound->left[i/2] = mp3.buffer[i];
else
sound->right[i/2] = mp3.buffer[i];
}
sound->len = mp3.samples/2;
}
free(mp3.buffer);
return sound;
}
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