Jack MIDI portnames (fixes #944) (#945)

* Rework the seqmidi aliases.

- The 1st alias is now the Jack1 MIDI port name with alsa_midi prefix.

- This 2nd alias is basically the same as the 1st alias with the
  alsa_midi prefix stripped, so that devices are listed under the ALSA
  names.

Also fixed the "capture" and "playback" port type names which were the
wrong way round.

* Rework the rawmidi alias.

Like in alsa_seqmidi.c, the 1st alias is now the Jack1 MIDI port name
with alsa_midi prefix.

* Rework pretty-name metadata.

The rawmidi and seqmidi pretty-name metadata now uses the same Jack1
port name as the 1st alias, without the alsa_midi: prefix.

linux/alsa/alsa_rawmidi.c

@@ -91,6 +91,7 @@ struct midi_port_t {
 	char dev[16];
 	char name[64];
 	char device_name[64];
+	char subdev_name[64];
 
 	jack_port_t *jack;
 	snd_rawmidi_t *rawmidi;
@@ -415,6 +416,7 @@ void midi_port_init(const alsa_rawmidi_t *midi, midi_port_t *port, snd_rawmidi_i
 	name = snd_rawmidi_info_get_subdevice_name(info);
 	if (!strlen(name))
 		name = port->device_name;
+	strncpy(port->subdev_name, name, sizeof(port->subdev_name));
 	snprintf(port->name, sizeof(port->name), "%s %s %s", port->id.id[2] ? "out":"in", port->dev, name);
 
 	// replace all offending characters with '-'
@@ -438,9 +440,43 @@ inline int midi_port_open_jack(alsa_rawmidi_t *midi, midi_port_t *port, int type
 	port->jack = jack_port_register(midi->client, name, JACK_DEFAULT_MIDI_TYPE,
 		type | JackPortIsPhysical | JackPortIsTerminal, 0);
 
+	// Like in alsa_seqmidi.c, use the Jack1 port name as alias. -ag
+	const char *prefix = "alsa_midi:";
+	const char* device_name = port->device_name;
+	const char* port_name = port->subdev_name;
+	const char *type_name = (type & JackPortIsOutput) ? "out" : "in";
+	if (strstr (port_name, device_name) == port_name) {
+	  /* entire client name is part of the port name so don't replicate it */
+	  snprintf (name,
+		    sizeof(name),
+		    "%s%s (%s)",
+		    prefix,
+		    port_name,
+		    type_name);
+	} else {
+	  snprintf (name,
+		    sizeof(name),
+		    "%s%s %s (%s)",
+		    prefix,
+		    device_name,
+		    port_name,
+		    type_name);
+	}
+
+	// replace all offending characters with ' '
+	char *c;
+	for (c = name; *c; ++c) {
+	  if (!isalnum(*c) && *c != ' ' && *c != '/' && *c != '_' && *c != ':' && *c != ',' && *c != '(' && *c != ')') {
+			*c = ' ';
+		}
+	}
+
 	if (port->jack) {
-		jack_port_set_alias(port->jack, alias);
-		jack_port_set_default_metadata(port->jack, port->device_name);
+		// we just ignore the given alias argument, and use the Jack1
+		// port name from above instead -ag
+		jack_port_set_alias(port->jack, name);
+		// Pretty-name metadata is the same as alias without the prefix.
+		jack_port_set_default_metadata (port->jack, name+strlen(prefix));
 	}
 
 	return port->jack == NULL;

linux/alsa/alsa_seqmidi.c

@@ -147,13 +147,13 @@ static port_type_t port_type[2] = {
 	{
 		SND_SEQ_PORT_CAP_SUBS_READ,
 		JackPortIsOutput,
-		"playback",
+		"capture",
 		do_jack_input
 	},
 	{
 		SND_SEQ_PORT_CAP_SUBS_WRITE,
 		JackPortIsInput,
-		"capture",
+		"playback",
 		do_jack_output
 	}
 };
@@ -493,15 +493,6 @@ port_t* port_create(alsa_seqmidi_t *self, int type, snd_seq_addr_t addr, const s
 	snd_seq_client_info_alloca (&client_info);
 	snd_seq_get_any_client_info (self->seq, addr.client, client_info);
 
-	const char *device_name = snd_seq_client_info_get_name(client_info);
-	snprintf(port->name, sizeof(port->name), "alsa_pcm:%s/midi_%s_%d",
-		 device_name, port_type[type].name, addr.port+1);
-
-	// replace all offending characters by -
-	for (c = port->name; *c; ++c)
-		if (!isalnum(*c) && *c != '/' && *c != '_' && *c != ':' && *c != '(' && *c != ')')
-			*c = '-';
-
 	jack_caps = port_type[type].jack_caps;
 
 	/* mark anything that looks like a hardware port as physical&terminal */
@@ -520,21 +511,61 @@ port_t* port_create(alsa_seqmidi_t *self, int type, snd_seq_addr_t addr, const s
 	if (!port->jack_port)
 		goto failed;
 
-	jack_port_set_alias (port->jack_port, port->name);
-	jack_port_set_default_metadata (port->jack_port, device_name);
+	// First alias: Jack1-compatible port name. -ag
+	const char *prefix = "alsa_midi:";
+	const char *device_name = snd_seq_client_info_get_name(client_info);
+	const char* port_name = snd_seq_port_info_get_name (info);
+	const char* type_name = jack_caps & JackPortIsOutput ? "out" : "in";
+	// This code is pilfered from Jack1. -ag
+	if (strstr (port_name, device_name) == port_name) {
+	  /* entire client name is part of the port name so don't replicate it */
+	  snprintf (port->name,
+		    sizeof(port->name),
+		    "%s%s (%s)",
+		    prefix,
+		    port_name,
+		    type_name);
+	} else {
+	  snprintf (port->name,
+		    sizeof(port->name),
+		    "%s%s %s (%s)",
+		    prefix,
+		    device_name,
+		    port_name,
+		    type_name);
+	}
 
-	/* generate an alias */
-
-	snprintf(port->name, sizeof(port->name), "%s:midi/%s_%d",
-		 snd_seq_client_info_get_name (client_info), port_type[type].name, addr.port+1);
-
-	// replace all offending characters by -
-	for (c = port->name; *c; ++c)
-		if (!isalnum(*c) && *c != '/' && *c != '_' && *c != ':' && *c != '(' && *c != ')')
-			*c = '-';
+	// replace all offending characters with ' '
+	for (c = port->name; *c; ++c) {
+		if (!isalnum(*c) && *c != ' ' && *c != '/' && *c != '_' && *c != ':' && *c != '(' && *c != ')') {
+			*c = ' ';
+		}
+	}
+
+	jack_port_set_alias (port->jack_port, port->name);
+	// Pretty-name metadata is the same as first alias without the prefix.
+	jack_port_set_default_metadata (port->jack_port, port->name+strlen(prefix));
+
+	// Second alias: Strip the alsa_midi prefix, so that devices appear
+	// under their ALSA names. Use the ALSA port names (without device
+	// prefix) for the individual ports. -ag
+	if (strstr (port_name, device_name) == port_name) {
+	  // remove the device name prefix from the port name if present
+	  port_name += strlen(device_name);
+	  while (*port_name == ' ' || *port_name == '\t')
+	    port_name++;
+	}
+	snprintf(port->name, sizeof(port->name), "%s:%s (%s)",
+		 device_name, port_name, port_type[type].name);
+
+	// replace all offending characters with ' '
+	for (c = port->name; *c; ++c) {
+		if (!isalnum(*c) && *c != ' ' && *c != '/' && *c != '_' && *c != ':' && *c != '(' && *c != ')') {
+			*c = ' ';
+		}
+	}
 
 	jack_port_set_alias (port->jack_port, port->name);
-	jack_port_set_default_metadata (port->jack_port, device_name);
 
 	if (type == PORT_INPUT)
 		err = alsa_connect_from(self, port->remote.client, port->remote.port);