parse_mid

Over the years I've done a few projects that required .mid file reading (and sometimes writing). Since I'm again working on a project where I'd like to read in a .mid file, I decided to clean up the code of one of the projects by breaking it up into more generic modules and orchestrating it all through a main module that could be turned into a .so file.

The main test program here is parse_mid. Running it on a .mid file gives out put that looks like:

-- MThd ---
           name: Electric Piano
         length: 6307
            ptr: 0
           data: 0x562cb3397040
 MetaEvent: vlength=0 track_name: Electric Piano
 ControlChange: vlength=0 channel=0 Unknown
 ProgramChange: vlength=0 channel=0 program_number=5
 MetaEvent: vlength=0 key_signature: sf=00 mi=00
  note: { len=3440 On  chan=0  velocity=57  tone=[ 71 B4 493.880 ] }
  note: { len=8    On  chan=0  velocity=46  tone=[ 67 G4 392.000 ] }
  note: { len=184  Off chan=0  velocity=0   tone=[ 67 G4 392.000 ] }
  note: { len=4    On  chan=0  velocity=65  tone=[ 62 D4 293.660 ] }
  note: { len=12   Off chan=0  velocity=0   tone=[ 71 B4 493.880 ] }