libportsmf0v5 binary package in Ubuntu Focal amd64

 Portsmf is "Port Standard MIDI File", a cross-platform, C++ library for reading
 and writing Standard MIDI Files.
 .
 Features:
 .
  - input and output of Standard MIDI Files
  - data structures, classes, etc. for representing music data in memory
    o sequence structure consisting of multiple tracks
    o track structure consisting of multiple events
    o events contain note and control data
    o extensible attribute-value property lists
    o tempo track and time signature representation
  - input and output of a text-based representation: Allegro files
  - extensive editing operations on sequences and tracks
  - conversion to/from binary buffers for archiving, undo/redo, etc.

Source package