Added boilerplate interface code

1 files changed, 82 insertions, 84 deletions

diff --git a/midi.c b/midi.c
index 92df3d3..e924b70 100644
--- a/midi.c
+++ b/midi.c
@@ -13,110 +13,108 @@ 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_open(&seq_handle, "default", SND_SEQ_OPEN_DUPLEX, 0) < 0) {
+		fprintf(stderr, "Error opening ALSA sequencer.\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);
-		}
+	if (snd_seq_set_client_name(seq_handle, CLIENT_NAME) < 0) {
+		fprintf(stderr, "Could not set up client name.\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);
-		}
+	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);
+	}
 
-		// 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.
+	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);
+	}
 
-		// 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);
-			}
-		}
+	// 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);
+	}
 
-		if (snd_seq_nonblock(seq_handle, 1) < 0) {
-			fprintf(stderr, "Set nonblock mode failed.");
+	// 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;
 
-		// Reading MIDI device.
-		struct pollfd *pfds;
-		size_t npfds;
+	npfds = snd_seq_poll_descriptors_count(seq_handle, POLLIN);
+	pfds = alloca(sizeof(*pfds) * 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_poll_descriptors(seq_handle, pfds, npfds, POLLIN);
-			if (poll(pfds, npfds, -1) < 0) {
+			snd_seq_event_t *ev;
+
+			if (snd_seq_event_input(seq_handle, &ev) < 0) {
 				break;
 			}
 
-			for (;;) {
-				snd_seq_event_t *ev;
+			if (ev) {
+				pthread_mutex_lock(&mutex);
+				switch (ev->type) {
+					case SND_SEQ_EVENT_NOTEON:
+						shared_data.note = ev->data.note.note;
+						shared_data.state = 1;
+						shared_data.velocity = ev->data.note.velocity;
+						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:
+						shared_data.note = ev->data.note.note;
+						shared_data.state = 0;
+						shared_data.velocity = 0;
+						printf("%3d:%-3dNote off\t%2d, note %d\n",
+								ev->source.client, ev->source.port,
+								ev->data.note.channel,
+								ev->data.note.note);
+						break;
 
-				if (snd_seq_event_input(seq_handle, &ev) < 0) {
-					break;
-				}
 
-				if (ev) {
-					pthread_mutex_lock(&mutex);
-					switch (ev->type) {
-						case SND_SEQ_EVENT_NOTEON:
-							shared_data.note = ev->data.note.note;
-							shared_data.state = 1;
-							shared_data.velocity = ev->data.note.velocity;
-							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:
-							shared_data.note = ev->data.note.note;
-							shared_data.state = 0;
-							shared_data.velocity = 0;
-							printf("%3d:%-3dNote off\t%2d, note %d\n",
-									ev->source.client, ev->source.port,
-									ev->data.note.channel,
-									ev->data.note.note);
-							break;
-						default:
-							break;
-					}
-
-					shared_data.action = 1;
-
-					pthread_cond_signal(&cond_synth);
-					pthread_mutex_unlock(&mutex);
 				}
-			}
 
-			fflush(stdout);
+				shared_data.action = 1;
+
+				pthread_cond_signal(&cond_synth);
+				pthread_mutex_unlock(&mutex);
+			}
 		}
+
+		fflush(stdout);
 	}
 }