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/*
* dolmetschctl
*
*
* Copyright (C) 2015 Christian Pointner <equinox@spreadspace.org>
*
* This file is part of dolmetschctl.
*
* dolmetschctl 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
* any later version.
*
* dolmetschctl 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 dolmetschctl. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdio.h>
#include <error.h>
#include <poll.h>
#include "midi.h"
int midi_init(midi_t* m, const char* device)
{
if(!m)
return -1;
int ret = snd_rawmidi_open(&(m->input_), NULL, device, SND_RAWMIDI_NONBLOCK);
if(ret < 0) {
error(0, 0, "MIDI: cannot open port '%s': %s", device, snd_strerror(ret));
return ret;
}
return 0;
}
void midi_run(midi_t* m)
{
if(!m)
return;
int npfds;
struct pollfd *pfds;
npfds = snd_rawmidi_poll_descriptors_count(m->input_);
pfds = alloca(npfds * sizeof(struct pollfd));
snd_rawmidi_poll_descriptors(m->input_, pfds, npfds);
for (;;) {
int err = poll(pfds, npfds, 200);
if(err < 0 && errno == EINTR)
break;
if(err < 0) {
error(0, errno, "MIDI: poll failed");
break;
}
/* if(err == 0) { */
/* // TIMEOUT */
/* } */
unsigned short revents;
if((err = snd_rawmidi_poll_descriptors_revents(m->input_, pfds, npfds, &revents)) < 0) {
error(0, 0, "MIDI: cannot get poll events: %s", snd_strerror(errno));
break;
}
if(revents & (POLLERR | POLLHUP))
break;
if(!(revents & POLLIN))
continue;
u_int8_t buf[256];
int ret = snd_rawmidi_read(m->input_, buf, sizeof(buf));
if (ret == -EAGAIN)
continue;
if(ret < 0) {
error(0, 0, "MIDI: cannot read from midi port: %s", snd_strerror(ret));
break;
}
int i;
printf("MIDI:%s", ret ? " ": " no data?\n");
for (i = 0; i < ret; ++i)
printf("%02X%c", buf[i], (i >= (ret-1)) ? '\n' : ' ');
}
}
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