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## Copyright (C) 2019 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{midimsg} =} midireceive (@var{dev})
## @deftypefnx {} {@var{midimsg} =} midireceive (@var{dev}, @var{maxmsg})
## Attempt to receive midi messages from a midi device.
##
## @subsubheading Inputs
## @var{dev} - a octave midi device opened using mididevice.@*
## @var{maxmsg} - Maximum number of messages to retrieve. If not specified, the function will attempt to get all pending.@*
##
## @subsubheading Outputs
## @var{midimsg} - a midimsg containing the messages retrieved from the device.@*
## If no messages are available, @var{midimsg} will be empty.
##
## @subsubheading Examples
## Open device 0, and poll and display read messages
## @example
## dev = mididevice(0);
## while true
## mx = midireceive(dev);
## if !isempty(mx)
## % display message
## mx
## endif
## endwhile
## @end example
##
## @seealso{mididevice, midisend}
## @end deftypefn
function msg = midireceive (dev, maxmsg=0)
if nargin < 1 || !isobject(dev) || !strcmp(typeinfo(dev), "octave_midi")
error ("Expected midi device");
endif
if nargin < 2
maxmsg = 0;
endif
msg = midimsg (0);
[ts, data] = __midirecv__(dev);
while !isempty(data)
msg = [ msg midimsg.createMessage(data, ts) ];
if maxmsg > 0
maxmsg = maxmsg - 1;
if maxmsg == 0
break;
endif
endif
[ts, data] = __midirecv__(dev);
endwhile
endfunction
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