midi- Handling of MIDI messages and files



MIDI-File Datatype

Taken from Haskore.



data T Source

The datatypes for MIDI Files and MIDI Events


Cons Type Division [Track] 


data Type Source



empty :: TSource

An empty MIDI file.

explicitNoteOff :: T -> TSource

Convert all NoteOn p 0 to NoteOff p 64. The latter one is easier to process.

implicitNoteOff :: T -> TSource

Convert all NoteOff p 64 to NoteOn p 0. The latter one can be encoded more efficiently using the running status.

showLines :: T -> StringSource

Show the T with one event per line, suited for comparing MIDIFiles with diff. Can this be replaced by Sound.MIDI.Load.showFile?

changeVelocity :: Double -> T -> TSource

A hack that changes the velocities by a rational factor.

resampleTime :: Double -> T -> TSource

Change the time base.

sortEvents :: T -> TSource

Sort MIDI note events lexicographically. This is to make MIDI files unique and robust against changes in the computation. In principle Performance.merge should handle this but due to rounding errors in Float the order of note events still depends on some internal issues. The sample rate of MIDI events should be coarse enough to assert unique results.

progChangeBeforeSetTempo :: T -> TSource

Old versions of Haskore.Interface.MIDI.Write wrote MIDIEvent.ProgramChange and SetTempo once at the beginning of a file in that order. The current version supports multiple MIDIEvent.ProgramChanges in a track and thus a MIDIEvent.ProgramChange is set immediately before a note. Because of this a MIDIEvent.ProgramChange is now always after a SetTempo. For checking equivalence with old MIDI files we can switch this back.