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/*
* player.c
*
* Created on: Nov 25, 2025
* Author: sowgro
*/
#include "endian_converters.h"
#include <stdint.h>
#include "endian_converters.h"
#include "hw8.h"
#include "activity4.h"
#include "song_info.h"
#include "player.h"
#include "systick.h"
#include "tone.h"
#define NOTE_OFF_EVENT (0)
#define NOTE_ON_EVENT (1)
#define KEY_PRESSURE (2)
static track_t tracks[16];
static int nTracks;
static int startTime;
void play_notes(int count) {
int curAbsTime = count - startTime;
for (int i = 0; i < nTracks; i++) {
note_event_t curEvent = tracks[i].events[tracks[i].curEventIndex];
if (curEvent.abs_time >= curAbsTime) {
switch (curEvent.ev_type) {
case NOTE_OFF_EVENT:
remove_tone(curEvent.key_number); break;
case NOTE_ON_EVENT:
add_tone(curEvent.key_number, curEvent.value); break;
}
}
tracks[i].curEventIndex++;
}
play_tones();
}
void parse_song(uint8_t *p_song) {
header_t header;
header = get_header(p_song);
p_song += sizeof(header_t) - 2; // move pointer past header
song_info_t song_info;
p_song = get_song_info(p_song, &song_info);
for(int i = 0; i < header.ntrcks; i++){
p_song = parse_track(p_song, &tracks[i]);
}
nTracks = header.ntrcks;
}
uint8_t *parse_track(uint8_t *p_song, track_t *track) {
p_song += 4; // skip MTrk
uint32_t MTrk_len = convert_to_uint32(p_song);
p_song += 4;
int curEvent = 0;
uint32_t prev_abs_time = 0;
for (uint8_t *p_end = p_song + MTrk_len; p_song != p_end; p_song++) {
note_event_t note;
parseDelay_result_t delay_result = parseDelay(p_song);
uint32_t abs_time = prev_abs_time + delay_result.value;
note.abs_time = abs_time;
prev_abs_time = abs_time;
p_song += delay_result.bytes_used;
if (*p_song >> 4 == 0b1000) {
note.ev_type = NOTE_OFF_EVENT;
} else if (*p_song >> 4 == 0b1001) {
note.ev_type = NOTE_ON_EVENT;
} else if (*p_song >> 4 == 0b1010) {
note.ev_type = KEY_PRESSURE;
} else {
continue;
}
// size_t channelNumber = *p_song && 0b00001111;
p_song++;
note.key_number = *p_song;
p_song++;
note.value = *p_song;
p_song++;
track->events[curEvent++] = note;
}
track->nEvents = curEvent;
track->curEventIndex = 0;
return p_song;
}
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