Complete project

2 files changed, 67 insertions, 1 deletions

diff --git a/project/Core/Src/Project/project.c b/project/Core/Src/Project/project.c
index 379f380..1311219 100644
--- a/project/Core/Src/Project/project.c
+++ b/project/Core/Src/Project/project.c
@@ -11,6 +11,8 @@
 #include <stdio.h>
 #include "hw4.h"
 #include <string.h>
+#include "song_info.h"
+#include "song.h"
 
 #define PLAYING_STATE (1)
 #define PAUSED_STATE (2)
@@ -80,7 +82,21 @@ void help() {
 }
 
 void next() {
-	// TODO
+	static int current_song = -1;
+	current_song++;
+	if (current_song > 4)
+		current_song = 0;
+
+	void *song = get_song(current_song).p_song;
+	song_info_t song_info = get_song_info(song);
+
+	printf("Song #%i\r\n", current_song + 1);
+	if (song_info.title)
+		printf("Title: %s\r\n", song_info.title);
+	if (song_info.copyright)
+		printf("Copyright: %s\r\n", song_info.copyright);
+	if (song_info.tempo)
+		printf("Tempo: %i\r\n", song_info.tempo);
 }
 
 void play() {
diff --git a/project/Core/Src/Project/song_info.c b/project/Core/Src/Project/song_info.c
new file mode 100644
index 0000000..4d3f232
--- /dev/null
+++ b/project/Core/Src/Project/song_info.c
@@ -0,0 +1,50 @@
+/*
+ * 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"
+
+song_info_t get_song_info(uint8_t *p_song) {
+	song_info_t ret = {0, 0, 0};
+//	header_t *header = (header_t *) p_song;
+	p_song += sizeof(header_t) - 2; // move pointer past header
+	p_song += 4; // move past MTrk label
+
+	uint32_t MTrk_len = convert_to_uint32(p_song); // read in size of MTrk
+
+	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 ret;
+}