ladspa-sink: Add sink_master argument to enable filter-apply to load the module

Currently, module-filter-apply cannot load module-ladspa-sink because filter-apply
provides the argument "sink_master" but ladspa-sink expects "master" instead.

Therefore this patch adds the sink_master argument to module-ladspa-sink.

Additionally, the autoloaded argument was also added.

src/modules/module-ladspa-sink.c

@@ -55,6 +55,7 @@ PA_MODULE_USAGE(
     _("sink_name=<name for the sink> "
       "sink_properties=<properties for the sink> "
       "master=<name of sink to filter> "
+      "sink_master=<name of sink to filter> "
       "format=<sample format> "
       "rate=<sample rate> "
       "channels=<number of channels> "
@@ -63,9 +64,11 @@ PA_MODULE_USAGE(
       "label=<ladspa plugin label> "
       "control=<comma separated list of input control values> "
       "input_ladspaport_map=<comma separated list of input LADSPA port names> "
-      "output_ladspaport_map=<comma separated list of output LADSPA port names> "));
+      "output_ladspaport_map=<comma separated list of output LADSPA port names> "
+      "autoloaded=<set if this module is being loaded automatically> "));
 
 #define MEMBLOCKQ_MAXLENGTH (16*1024*1024)
+#define DEFAULT_AUTOLOADED false
 
 /* PLEASE NOTICE: The PortAudio ports and the LADSPA ports are two different concepts.
 They are not related and where possible the names of the LADSPA port variables contains "ladspa" to avoid confusion */
@@ -99,12 +102,14 @@ struct userdata {
 #endif
 
     bool auto_desc;
+    bool autoloaded;
 };
 
 static const char* const valid_modargs[] = {
     "sink_name",
     "sink_properties",
-    "master",
+    "master",  /* Will be deprecated. */
+    "sink_master",
     "format",
     "rate",
     "channels",
@@ -114,6 +119,7 @@ static const char* const valid_modargs[] = {
     "control",
     "input_ladspaport_map",
     "output_ladspaport_map",
+    "autoloaded",
     NULL
 };
 
@@ -639,6 +645,19 @@ static void sink_input_state_change_cb(pa_sink_input *i, pa_sink_input_state_t s
     }
 }
 
+/* Called from main context */
+static bool sink_input_may_move_to_cb(pa_sink_input *i, pa_sink *dest) {
+    struct userdata *u;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(u = i->userdata);
+
+    if (u->autoloaded)
+        return false;
+
+    return u->sink != dest;
+}
+
 /* Called from main context */
 static void sink_input_moving_cb(pa_sink_input *i, pa_sink *dest) {
     struct userdata *u;
@@ -968,9 +987,12 @@ int pa__init(pa_module*m) {
         goto fail;
     }
 
-    if (!(master = pa_namereg_get(m->core, pa_modargs_get_value(ma, "master", NULL), PA_NAMEREG_SINK))) {
+    if (!(master = pa_namereg_get(m->core, pa_modargs_get_value(ma, "sink_master", NULL), PA_NAMEREG_SINK))) {
-        pa_log("Master sink not found");
+        if (!(master = pa_namereg_get(m->core, pa_modargs_get_value(ma, "master", NULL), PA_NAMEREG_SINK))) {
-        goto fail;
+            pa_log("Master sink not found.");
+            goto fail;
+        } else
+            pa_log("Argument 'master' will be deprecated, please use 'sink_master' instead.");
     }
 
     ss = master->sample_spec;
@@ -1231,6 +1253,12 @@ int pa__init(pa_module*m) {
         goto fail;
     }
 
+    u->autoloaded = DEFAULT_AUTOLOADED;
+    if (pa_modargs_get_value_boolean(ma, "autoloaded", &u->autoloaded) < 0) {
+        pa_log("Failed to parse autoloaded value");
+        goto fail;
+    }
+
     if ((u->auto_desc = !pa_proplist_contains(sink_data.proplist, PA_PROP_DEVICE_DESCRIPTION))) {
         const char *z;
 
@@ -1283,6 +1311,7 @@ int pa__init(pa_module*m) {
     u->sink_input->attach = sink_input_attach_cb;
     u->sink_input->detach = sink_input_detach_cb;
     u->sink_input->state_change = sink_input_state_change_cb;
+    u->sink_input->may_move_to = sink_input_may_move_to_cb;
     u->sink_input->moving = sink_input_moving_cb;
     u->sink_input->mute_changed = sink_input_mute_changed_cb;
     u->sink_input->userdata = u;