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/*
* song_info.c
*
* Created on: Oct 9, 2025
* Author: sowgro
*/
#include "song.h"
#include "activity4.h"
#include <stdint.h>
#include "song_info.h"
#include "endian_converters.h"
uint8_t *get_song_info(uint8_t *p_song, song_info_t *ret) {
ret->copyright = 0;
ret->tempo = 0;
ret->title = 0;
p_song += 4; // move past MTrk label
uint32_t MTrk_len = convert_to_uint32(p_song); // read in size of MTrk
p_song += sizeof(MTrk_len);
for (uint8_t *p_end = p_song + MTrk_len; p_song != p_end; p_song++) {
// FF 02 - copyright
if (convert_to_uint16(p_song) == 0xFF02) {
p_song += sizeof(uint16_t);
uint8_t ev_len = *(uint8_t *) p_song;
p_song += sizeof(ev_len);
ret->copyright = (char *) p_song;
ret->copyright[ev_len] = 0;
}
// FF 03 - title
if (convert_to_uint16(p_song) == 0xFF03) {
p_song += sizeof(uint16_t);
uint8_t ev_len = *(uint8_t *) p_song;
p_song += sizeof(ev_len);
ret->title = (char *) p_song;
ret->title[ev_len] = 0;
}
// FF 51 - tempo
if (convert_to_uint16(p_song) == 0xFF51) {
p_song += sizeof(uint16_t);
p_song += sizeof(uint8_t); // skip length, always 03
ret->tempo = convert_to_uint24(p_song);
}
}
return p_song;
}
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