output/jack: use jack_client_open() instead of jack_client_new()

jack_client_new() is deprecated.  This requires libjack 0.100
(released nearly 5 years ago).  We havn't been testing older libjack
versions anyway.

As a side effect, there is the new option "autostart".

NEWS

@@ -32,6 +32,7 @@ ver 0.16 (20??/??/??)
   - pulse: announce "media.role=music"
   - pulse: renamed context to "Music Player Daemon"
   - pulse: connect to server on MPD startup, implement pause
+  - jack: require libjack 0.100
   - jack: don't disconnect during pause
   - jack: connect to server on MPD startup
   - jack: added option "client_name"

configure.ac

@@ -700,7 +700,7 @@ AC_ARG_ENABLE(jack,
 		[enable jack support]),,
 	enable_jack=auto)
 
-MPD_AUTO_PKG(jack, JACK, [jack >= 0.4],
+MPD_AUTO_PKG(jack, JACK, [jack >= 0.100],
 	[JACK output plugin], [libjack not found])
 if test x$enable_jack = xyes; then
 	AC_DEFINE([HAVE_JACK], 1, [Define to enable JACK support])

doc/user.xml

@@ -745,6 +745,17 @@ cd mpd-version</programlisting>
                   Player Daemon".
                 </entry>
               </row>
+              <row>
+                <entry>
+                  <varname>autostart</varname>
+                  <parameter>yes|no</parameter>
+                </entry>
+                <entry>
+                  If set to <parameter>yes</parameter>, then
+                  <filename>libjack</filename> will automatically
+                  launch the JACK daemon.  Disabled by default.
+                </entry>
+              </row>
               <row>
                 <entry>
                   <varname>ports</varname>

src/output/jack_output_plugin.c

@@ -43,6 +43,11 @@ static const char *const port_names[2] = {
 };
 
 struct jack_data {
+	/**
+	 * libjack options passed to jack_client_open().
+	 */
+	jack_options_t options;
+
 	const char *name;
 
 	/* configuration */
@@ -169,13 +174,17 @@ mpd_jack_disconnect(struct jack_data *jd)
 static bool
 mpd_jack_connect(struct jack_data *jd, GError **error_r)
 {
+	jack_status_t status;
+
 	assert(jd != NULL);
 
 	jd->shutdown = false;
 
-	if ((jd->client = jack_client_new(jd->name)) == NULL) {
+	jd->client = jack_client_open(jd->name, jd->options, &status);
+	if (jd->client == NULL) {
 		g_set_error(error_r, jack_output_quark(), 0,
-			    "Failed to connect to JACK server");
+			    "Failed to connect to JACK server, status=%d",
+			    status);
 		return false;
 	}
 
@@ -212,8 +221,18 @@ mpd_jack_init(G_GNUC_UNUSED const struct audio_format *audio_format,
 	const char *value;
 
 	jd = g_new(struct jack_data, 1);
-	jd->name = config_get_block_string(param, "client_name",
+	jd->options = JackNullOption;
-					   "Music Player Daemon");
+
+	jd->name = config_get_block_string(param, "client_name", NULL);
+	if (jd->name != NULL)
+		jd->options |= JackUseExactName;
+	else
+		/* if there's a no configured client name, we don't
+		   care about the JackUseExactName option */
+		jd->name = "Music Player Daemon";
+
+	if (!config_get_block_bool(param, "autostart", false))
+		jd->options |= JackNoStartServer;
 
 	value = config_get_block_string(param, "ports", NULL);
 	if (value != NULL) {