1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/*
* 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_), &(m->output_), device, SND_RAWMIDI_NONBLOCK);
if(ret < 0) {
error(0, 0, "cannot open midi 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, "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, "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, "cannot read from midi port: %s", snd_strerror(ret));
break;
}
int i;
for (i = 0; i < ret; ++i)
printf("%02X%c", buf[i], (i >= (ret-1)) ? '\n' : ' ');
}
}
|
