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## Copyright (C) 2019-2021 John Donoghue <john.donoghue@ieee.org>
##
## This program is free software: you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program. If not, see
## <https://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {} {@var{devlist} =} mididevinfo ()
## @deftypefnx {} {} mididevinfo ()
## Retrieve the midi devices detected within the system.
##
## The list will be stored with variable @var{devlist} as either a input or output device.
## If no output variable is provided, the devices will be displayed.
##
## @subsubheading Inputs
## None
##
## @subsubheading Outputs
## @var{devlist} - a structure containing the midi device information
##
## @subsubheading Examples
## Display the known devices of the system.
## @example
## @command{>} mididevinfo
##
## MIDI devices available
## ID Direction Interface Name
## 0 output Alsa Midi Through:Midi Through Port-0 14:0
## 1 output Alsa Ensoniq AudioPCI:ES1371 16:0
## 2 output Alsa SparkFun Pro Micro:SparkFun Pro Micro MIDI 1 20:0
## 3 input Alsa Midi Through:Midi Through Port-0 14:0
## 4 input Alsa Ensoniq AudioPCI:ES1371 16:0
## 5 input Alsa SparkFun Pro Micro:SparkFun Pro Micro MIDI 1 20:0
## @end example
##
## Assign variable @var{mididevices} with the values from the known devices
## @example
## @command{>} mididevices = mididevinfo
##
## mididevices =
## scalar structure containing the fields:
## input =
## @{
## [1,1] =
## scalar structure containing the fields:
## Name = SparkFun Pro Micro:SparkFun Pro Micro MIDI 1 20:0
## Interface = Alsa
## ID = 0
## @}
## output =
## @{
## [1,1] =
## scalar structure containing the fields:
## Name = SparkFun Pro Micro:SparkFun Pro Micro MIDI 1 20:0
## Interface = Alsa
## ID = 1
## @}
## @end example
##
## @seealso{mididevice}
## @end deftypefn
function out = mididevinfo ()
# get dev list
data = __mididevinfo__();
# output variable to store to - so assign devices to it
if nargout > 0
out = {};
out.input = {};
out.output = {};
for i=1:length(data)
val = {};
val.Name = data(i).Name;
val.Interface = data(i).Interface;
val.ID = data(i).ID;
if strcmp (data(i).Direction, "input")
out.input{end+1} = val;
else
out.output{end+1} = val;
endif
endfor
# no output - just display the devices
else
printf ("MIDI devices available\n");
printf ("ID Direction Interface Name\n");
for i=1:length(data)
printf ("%2d %-9s %-10s %s\n", data(i).ID, data(i).Direction, data(i).Interface, data(i).Name);
endfor
endif
endfunction
%!xtest
%! a = mididevinfo;
%! assert(length(a) > 0);
%! x = a.input;
%! x = a.output;
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