core: Added new hooks: PA_CORE_HOOK_SOURCE_PORT_CHANGED and PA_CORE_HOOK_SINK_PORT_CHANGED

This allows modules to know when certain ports are changed.
This will allow e.g. a filter module (or LADSAP) to only load
when a certain port is used on the device (e.g. to only filter
headphones and not normal speakers).

(Comment from Colin Guthrie: This may also have use in UCM)

src/pulsecore/core.h

@@ -74,6 +74,7 @@ typedef enum pa_core_hook {
     PA_CORE_HOOK_SINK_UNLINK_POST,
     PA_CORE_HOOK_SINK_STATE_CHANGED,
     PA_CORE_HOOK_SINK_PROPLIST_CHANGED,
+    PA_CORE_HOOK_SINK_PORT_CHANGED,
     PA_CORE_HOOK_SOURCE_NEW,
     PA_CORE_HOOK_SOURCE_FIXATE,
     PA_CORE_HOOK_SOURCE_PUT,
@@ -81,6 +82,7 @@ typedef enum pa_core_hook {
     PA_CORE_HOOK_SOURCE_UNLINK_POST,
     PA_CORE_HOOK_SOURCE_STATE_CHANGED,
     PA_CORE_HOOK_SOURCE_PROPLIST_CHANGED,
+    PA_CORE_HOOK_SOURCE_PORT_CHANGED,
     PA_CORE_HOOK_SINK_INPUT_NEW,
     PA_CORE_HOOK_SINK_INPUT_FIXATE,
     PA_CORE_HOOK_SINK_INPUT_PUT,

src/pulsecore/sink.c

@@ -2700,6 +2700,8 @@ int pa_sink_set_port(pa_sink *s, const char *name, pa_bool_t save) {
     s->active_port = port;
     s->save_port = save;
 
+    pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_PORT_CHANGED], s);
+
     return 0;
 }
 

src/pulsecore/source.c

@@ -1571,5 +1571,7 @@ int pa_source_set_port(pa_source *s, const char *name, pa_bool_t save) {
     s->active_port = port;
     s->save_port = save;
 
+    pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SOURCE_PORT_CHANGED], s);
+
     return 0;
 }