How to parse a music into a array of frequencies and durations of its notes

Question

Greetings,

I'm working on a low level programming project and I want to play a music with the computer speaker.

I'm already capable of using the speaker (with timer2) and a song is represented in the following way:

note_t *music;

where note_t represents a note and it's compound by:

typedef struct {
  int freq; /* note frequency */
  int dur;  /* note duration in miliseconds */
} note_t;

Now, what would be the best way to get the frequencies and durations of the notes from a music file?

Thanks in advance!

EDIT

To clarify some doubts, what I want to know is the best format to get the necessary information to create a song with the structure above indicated.

Answer 1

Depending on your exact purpose, you can use one of the ringtone formats or invent your own.

An example simple ringtone format is RTTTL.