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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 {} {} midisend (@var{dev}, @var{msg})
## @deftypefnx {} {} midisend (@var{dev}, ...)
## Send a midimsg to a midi device
##
## @subsubheading Inputs
## @var{dev} - midi device opened using mididevice@*
## @var{msg} - a midi message class with messages to send to the midi device@*
## If the msg isn't a midimsg class, the input data is expected to be in same format as the inputs to a midimsg object.
##
## @subsubheading Outputs
## None
##
## @subsubheading Examples
## Send a note on/off command to a opened midi device @var{dev}
## @example
## midisend(dev, midimsg("note", 1, 60, 100, 2.0));
## @end example
##
## @seealso{midimsg, mididevice, midireceive}
## @end deftypefn
function midisend (dev, varargin)
if nargin < 2
error ("Expected midi device and midi message");
endif
if !isobject(dev) || !strcmp(typeinfo(dev), "octave_midi")
error ("Expected midi device");
endif
msg = varargin{1};
# NOTE: can be an array or cell of messages too
if isa (msg, "midimsg")
if nargin > 2
error ("additional parameters provided after the message");
endif
else
# have data to make a message
msg = midimsg(varargin{2:end});
endif
# TODO: determine if is 'recent' or not for what timestamp to use
# currently, we 'assume' that the 1st midi msg must go NOW
if length(msg) > 0
timestamp = msg(1).timestamp;
else
timestamp = 0;
endif
# loop thru data and send each message
for i=1:length(msg)
m = msg(i);
ts = m.timestamp;
data = m.msgbytes;
if ts < timestamp
ts = timestamp - ts;
endif
delta = (ts - timestamp);
if delta < 0
delta = 0;
endif
pause(delta);
# if we have metaevents, dont send them length would be FF type encodedsize data
if length(data) < 3 || data(1) != 0xff
__midisend__(dev, ts, data);
endif
timestamp = timestamp + delta;
endfor
endfunction
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