arecordmidi2: Add passive mode and interactive mode

Allow arecordmidi2 running without specifying the source ports via -p
option.  This will create a UMP Endpoint with the full 16 FBs, and
simply reads from the input ports via subscribers.  User needs to
connect to the ports manually, though.

Also, add -r option to run in the interactive mode.  In the
interactive mode, arecordmidi2 waits for the RETURN key entered from
the terminal to start the recording, and the recording ends after
another RETURN key.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

seq/aplaymidi2/arecordmidi2.1

@@ -5,7 +5,7 @@ arecordmidi2 \- record a MIDI Clip file
 
 .SH SYNOPSIS
 .B arecordmidi2
-\-p client:port[,...] [options] midi2file
+[options] midi2file
 
 .SH DESCRIPTION
 .B arecordmidi2
@@ -32,6 +32,16 @@ A client can be specified by its number, its name, or a prefix of its
 name. A port is specified by its number; for port 0 of a client, the
 ":0" part of the port specification can be omitted.
 
+\fBarecordmidi2\fP creates a UMP Endpoint containing the same number
+of Function Blocks as specified by this option, each of which is
+connected to the specified port as a source.
+
+When no source ports are specified with \fI\-p\fP option,
+\fBarecordmidi2\fP creates a UMP Endpoint with full 16 Function Blocks
+and records from those inputs.  User can connect the sequencer ports
+freely via \fBaconnect\fP, for example.  This mode can be used
+together with the interactive mode via \fI\-r\fP option.
+
 .TP
 .I \-b,\-\-bpm=beats
 Sets the musical tempo of the MIDI file, in beats per minute.
@@ -62,6 +72,14 @@ Sets the UMP MIDI protocol version. Either 1 or 2 has to be given for
 MIDI 1.0 and MIDI 2.0 protocol, respectively.
 Default is 1.
 
+.TP
+.I \-r,\-\-interactive
+Run in the interactive mode.  \fBarecordmidi2\fP waits for a RETURN
+key input from the terminal to start the recording.  After starting,
+the recording ends when another RETURN key is input from the
+terminal.  The received events before the start of recording are
+discarded.
+
 .SH SEE ALSO
 arecordmidi(1)
 .br

seq/aplaymidi2/arecordmidi2.c

@@ -93,8 +93,15 @@ static void create_ump_client(void)
 	snd_ump_endpoint_info_t *ep;
 	snd_ump_block_info_t *blk;
 	snd_seq_port_info_t *pinfo;
+	int num_groups;
 	int i, err;
 
+	/* in passive mode, create full 16 groups */
+	if (port_count)
+		num_groups = port_count;
+	else
+		num_groups = 16;
+
 	/* create a UMP Endpoint */
 	snd_ump_endpoint_info_alloca(&ep);
 	snd_ump_endpoint_info_set_name(ep, "arecordmidi2");
@@ -105,14 +112,14 @@ static void create_ump_client(void)
 		snd_ump_endpoint_info_set_protocol_caps(ep, SND_UMP_EP_INFO_PROTO_MIDI2);
 		snd_ump_endpoint_info_set_protocol(ep, SND_UMP_EP_INFO_PROTO_MIDI2);
 	}
-	snd_ump_endpoint_info_set_num_blocks(ep, port_count);
+	snd_ump_endpoint_info_set_num_blocks(ep, num_groups);
 
-	err = snd_seq_create_ump_endpoint(seq, ep, port_count);
+	err = snd_seq_create_ump_endpoint(seq, ep, num_groups);
 	check_snd("create UMP endpoint", err);
 
 	/* create UMP Function Blocks */
 	snd_ump_block_info_alloca(&blk);
-	for (i = 0; i < port_count; i++) {
+	for (i = 0; i < num_groups; i++) {
 		char blkname[32];
 
 		sprintf(blkname, "Group %d", i + 1);
@@ -128,7 +135,7 @@ static void create_ump_client(void)
 
 	/* toggle timestamping for all input ports */
 	snd_seq_port_info_alloca(&pinfo);
-	for (i = 0; i <= port_count; i++) {
+	for (i = 0; i <= num_groups; i++) {
 		err = snd_seq_get_port_info(seq, i, pinfo);
 		check_snd("get port info", err);
 		snd_seq_port_info_set_timestamping(pinfo, 1);
@@ -343,8 +350,11 @@ static void write_file_header(FILE *file)
 	/* first DCS */
 	write_dcs(file, 0);
 	write_dctpq(file);
+}
 
-	/* start bar */
+/* write start bar */
+static void start_bar(FILE *file)
+{
 	write_start_clip(file);
 	write_tempo(file);
 	write_time_sig(file);
@@ -361,7 +371,8 @@ static void help(const char *argv0)
 		"  -t,--ticks=ticks           resolution in ticks per beat or frame\n"
 		"  -i,--timesig=nn:dd         time signature\n"
 		"  -n,--num-events=events     fixed number of events to record, then exit\n"
-		"  -u,--ump=version           UMP MIDI version (1 or 2)\n",
+		"  -u,--ump=version           UMP MIDI version (1 or 2)\n"
+		"  -r,--interactive           Interactive mode\n",
 		argv0);
 }
 
@@ -377,7 +388,7 @@ static void sighandler(int sig ATTRIBUTE_UNUSED)
 
 int main(int argc, char *argv[])
 {
-	static const char short_options[] = "hVp:b:t:n:u:";
+	static const char short_options[] = "hVp:b:t:n:u:r";
 	static const struct option long_options[] = {
 		{"help", 0, NULL, 'h'},
 		{"version", 0, NULL, 'V'},
@@ -387,6 +398,7 @@ int main(int argc, char *argv[])
 		{"timesig", 1, NULL, 'i'},
 		{"num-events", 1, NULL, 'n'},
 		{"ump", 1, NULL, 'u'},
+		{"interactive", 0, NULL, 'r'},
 		{0}
 	};
 
@@ -398,6 +410,8 @@ int main(int argc, char *argv[])
 	/* If |num_events| isn't specified, leave it at 0. */
 	long num_events = 0;
 	long events_received = 0;
+	int start = 0;
+	int interactive = 0;
 
 	init_seq();
 
@@ -441,17 +455,15 @@ int main(int argc, char *argv[])
 			if (midi_version != 1 && midi_version != 2)
 				fatal("Invalid MIDI version %d\n", midi_version);
 			break;
+		case 'r':
+			interactive = 1;
+			break;
 		default:
 			help(argv[0]);
 			return 1;
 		}
 	}
 
-	if (port_count < 1) {
-		fputs("Pleast specify a source port with --port.\n", stderr);
-		return 1;
-	}
-
 	if (optind >= argc) {
 		fputs("Please specify a file to record to.\n", stderr);
 		return 1;
@@ -459,6 +471,7 @@ int main(int argc, char *argv[])
 
 	create_queue();
 	create_ump_client();
+	if (port_count)
 		connect_ports();
 
 	filename = argv[optind];
@@ -468,6 +481,13 @@ int main(int argc, char *argv[])
 		fatal("Cannot open %s - %s", filename, strerror(errno));
 
 	write_file_header(file);
+	if (interactive) {
+		printf("Press RETURN to start recording:");
+		fflush(stdout);
+	} else {
+		start_bar(file);
+		start = 1;
+	}
 
 	err = snd_seq_start_queue(seq, queue, NULL);
 	check_snd("start queue", err);
@@ -480,18 +500,39 @@ int main(int argc, char *argv[])
 	signal(SIGTERM, sighandler);
 
 	npfds = snd_seq_poll_descriptors_count(seq, POLLIN);
-	pfds = alloca(sizeof(*pfds) * npfds);
+	pfds = alloca(sizeof(*pfds) * (npfds + 1));
 	for (;;) {
 		snd_seq_poll_descriptors(seq, pfds, npfds, POLLIN);
+		if (interactive) {
+			pfds[npfds].fd = STDIN_FILENO;
+			pfds[npfds].events = POLLIN | POLLERR | POLLNVAL;
+			if (poll(pfds, npfds + 1, -1) < 0)
+				break;
+			if (pfds[npfds].revents & POLLIN) {
+				while (!feof(stdin) && getchar() != '\n')
+					;
+				if (!start) {
+					start_bar(file);
+					start = 1;
+					printf("Press RETURN to stop recording:");
+					fflush(stdout);
+					continue;
+				} else {
+					stop = 1;
+				}
+			}
+		} else {
 			if (poll(pfds, npfds, -1) < 0)
 				break;
+		}
+
 		do {
 			snd_seq_ump_event_t *event;
 
 			err = snd_seq_ump_event_input(seq, &event);
 			if (err < 0)
 				break;
-			if (event) {
+			if (start && event) {
 				record_event(file, event);
 				events_received++;
 			}