One public entry point ties it all together - bytes in, a song out. Today you build Parse, which reads the header and every track into a single song model with events, notes, and a tempo map.
Build a Parse function that turns SMF bytes into a song of header, tracks, notes, and tempo map.
Every piece now exists in isolation; assembly is its own design decision. Parse
is the library’s front door: split the bytes into chunks, read the MThd for format
and division, parse each MTrk body into events, then run the timing passes -
absolute ticks per track, note pairing per track, and one tempo map across the file.
The result is a single Song value a caller can inspect without ever touching a
byte.
This is the deliverable the whole project was building toward: an importable parser
whose one public function takes raw SMF bytes and returns a structured song of
tracks, events, notes, and tempo. Have it return a clear error for malformed
input - a body that is not MThd, a truncated chunk - rather than panicking, so the
API is safe to hand any file. Tomorrow the capstone drives this function on a real
multi-track file and reads back the whole performance.
type Song struct {Format, Division uint16Tracks []Track // each with Events (abs ticks) and NotesTempoMap []TempoEntry}// Parse: splitChunks -> header from MThd -> parse each MTrk -> abs ticks,// notes, tempo map. Return a friendly error on malformed input.