analyse_midi_keyboard.c
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#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <signal.h>
#include <getopt.h>
#include <sys/poll.h>
#include <alsa/asoundlib.h>
#define NUM_PORT 24
static snd_seq_t *seq;
static void init_seq(void)
{
int err;
/* open sequencer */
err = snd_seq_open(&seq, "default", SND_SEQ_OPEN_DUPLEX, 0);
if (err<0) printf("open sequencer");
/* set our client's name */
err = snd_seq_set_client_name(seq, "analyseurmidi");
if (err<0) printf("set client name");
}
static void create_port(void)
{
int err;
err = snd_seq_create_simple_port(seq, "analyseurmidi",
SND_SEQ_PORT_CAP_WRITE |
SND_SEQ_PORT_CAP_SUBS_WRITE,
SND_SEQ_PORT_TYPE_MIDI_GENERIC |
SND_SEQ_PORT_TYPE_APPLICATION);
if (err<0)
printf("Port non créé \n");
}
static void connect_port(void)
{
int err;
err = snd_seq_connect_from(seq, 0, NUM_PORT, 0);
if (err < 0)
printf("Impossible de se connecter au port \n");
}
int main(){
init_seq();
struct pollfd *pfds;
int npfds, err;
create_port();
connect_port();
npfds = snd_seq_poll_descriptors_count(seq, POLLIN);
pfds = alloca(sizeof(*pfds) * npfds);
for (;;) {
snd_seq_poll_descriptors(seq, pfds, npfds, POLLIN);
if (poll(pfds, npfds, -1) < 0)
break;
do {
snd_seq_event_t *event;
err = snd_seq_event_input(seq, &event);
if (err < 0)
break;
if (event)
{
if (event->type == SND_SEQ_EVENT_NOTEON) printf("coucou %d\n",event->data.note.note);
}
} while (err > 0);
fflush(stdout);
}
snd_seq_close(seq);
return 0;
}