[Octave-patch-tracker] [patch #9868] midi functions

[Lars Kindermann]

Follow-up Comment #8, patch #9868 (project octave):

Under ALSA on Linux the names of devices tend to change after restarting
programs because the "name" is a concatenation of the immutable device name
and an assigned alsa id:


>> mididevinfo
MIDI devices available
ID Direction Interface  Name
0       output       Alsa Midi Through 14:0
1       output       Alsa VMPK Input 129:0
2       output       Alsa FLUID Synth (10094) 130:0
3       output       Alsa RtMidi Input Client 132:0
4        input       Alsa Midi Through 14:0
5        input       Alsa VMPK Output 128:0


after closing and restarting vmpk and qsynth changes to


>> mididevinfo
MIDI devices available
ID Direction Interface  Name
 0       output       Alsa Midi Through 14:0
 1       output       Alsa VMPK Input 136:0
 2       output       Alsa FLUID Synth (10866) 130:0
 3       output       Alsa RtMidi Input Client 132:0
 4        input       Alsa Midi Through 14:0
 5        input       Alsa VMPK Output 135:0


This makes it difficult to address devices in an octave script permanently
without the need to check for the current ID every time.

I suggest to change 


function t = match_name_and_type(x, name, type)
  t = (strcmpi(x.Name, name) && strcmpi(x.Direction,type));
endfunction


to


function t = match_name_and_type(x, name, type)
  t = (strncmpi(x.Name, name, length(name)) && strcmpi(x.Direction,type));
endfunction


so this will work


>> devin  = mididevice ('input' ,'VMPK Output')
devin =

  mididevice connected to
    input: 'VMPK Output 128:0' (6)


>> devout = mididevice ('output','FLUID Synth')
devout =

  mididevice connected to
    output: 'FLUID Synth (10866) 130:0' (2)




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