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#include <stdio.h>
#include <stdlib.h>
#include <alloca.h>
#include <unistd.h>
#include <alsa/asoundlib.h>
#include "midi.h"
static snd_seq_t *seq_handle;
static snd_seq_addr_t *ports;
void *midi(void *arg) {
MidiArgs* args = (MidiArgs*)arg;
while (1) {
if (snd_seq_open(&seq_handle, "default", SND_SEQ_OPEN_DUPLEX, 0) < 0) {
fprintf(stderr, "Error opening ALSA sequencer.\n");
exit(1);
}
if (snd_seq_set_client_name(seq_handle, CLIENT_NAME) < 0) {
fprintf(stderr, "Could not set up client name.\n");
exit(1);
}
if (snd_seq_create_simple_port(seq_handle, CLIENT_NAME,
SND_SEQ_PORT_CAP_WRITE |
SND_SEQ_PORT_CAP_SUBS_WRITE,
SND_SEQ_PORT_TYPE_MIDI_GENERIC |
SND_SEQ_PORT_TYPE_APPLICATION) < 0) {
fprintf(stderr, "Error creating sequencer port.\n");
exit(1);
}
// Connecting ports.
ports = realloc(ports, MAX_MIDI_PORTS * sizeof(snd_seq_addr_t));
if (snd_seq_parse_address(seq_handle, &ports[0], args->port_name) < 0) {
fprintf(stderr, "Invalid port %s.\n", args->port_name);
exit(1);
}
// Listing assigned ports.
fprintf(stdout, "Ports:\n");
for (int j = 0; j < MAX_MIDI_PORTS; j++) {
fprintf(stdout, " client: %d, port: %d\n", ports[j].client, ports[j].port);
}
// Connecting ports.
for (int i = 0; i < MAX_MIDI_PORTS; ++i) {
int err = snd_seq_connect_from(seq_handle, 0, ports[i].client, ports[i].port);
if (err < 0) {
fprintf(stderr, "Cannot connect from port %d:%d - %s", ports[i].client, ports[i].port, snd_strerror(err));
exit(1);
}
}
if (snd_seq_nonblock(seq_handle, 1) < 0) {
fprintf(stderr, "Set nonblock mode failed.");
exit(1);
}
// Reading MIDI device.
struct pollfd *pfds;
size_t npfds;
npfds = snd_seq_poll_descriptors_count(seq_handle, POLLIN);
pfds = alloca(sizeof(*pfds) * npfds);
for (;;) {
snd_seq_poll_descriptors(seq_handle, pfds, npfds, POLLIN);
if (poll(pfds, npfds, -1) < 0) {
break;
}
for (;;) {
snd_seq_event_t *ev;
if (snd_seq_event_input(seq_handle, &ev) < 0) {
break;
}
if (ev) {
switch (ev->type) {
case SND_SEQ_EVENT_NOTEON:
printf("%3d:%-3dNote on %2d, note %d, velocity: %3d\n",
ev->source.client, ev->source.port,
ev->data.note.channel,
ev->data.note.note,
ev->data.note.velocity);
break;
case SND_SEQ_EVENT_NOTEOFF:
printf("%3d:%-3dNote off\t%2d, note %d\n",
ev->source.client, ev->source.port,
ev->data.note.channel,
ev->data.note.note);
break;
}
}
}
fflush(stdout);
}
}
}
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