[PATCH v3 1/2] refactor default sink/source handling

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Currently the default sink policy is simple: either the user has
configured it explicitly, in which case we always use that as the
default, or we pick the sink with the highest priority. The sink
priorities are currently static, so there's no need to worry about
updating the default sink when sink priorities change.

I intend to make things a bit more complex: if the active port of a sink
is unavailable, the sink should not be the default sink, and I also want
to make sink priorities dependent on the active port, so changing the
port should cause re-evaluation of which sink to choose as the default.
Currently the default sink choice is done only when someone calls
pa_namereg_get_default_sink(), and change notifications are only sent
when a sink is created or destroyed. That makes it hard to add new rules
to the default sink selection policy.

This patch moves the default sink selection to
pa_core_update_default_sink(), which is called whenever something
happens that can affect the default sink choice. That function needs to
know the previous choice in order to send change notifications as
appropriate, but previously pa_core.default_sink was only set when the
user had configured it explicitly. Now pa_core.default_sink is always
set (unless there are no sinks at all), so pa_core_update_default_sink()
can use that to get the previous choice. The user configuration is saved
in a new variable, pa_core.configured_default_sink.

pa_namereg_get_default_sink() is now unnecessary, because
pa_core.default_sink can be used directly to get the
currently-considered-best sink. pa_namereg_set_default_sink() is
replaced by pa_core_set_configured_default_sink().

I haven't confirmed it, but I expect that this patch will fix problems
in the D-Bus protocol related to default sink handling. The D-Bus
protocol used to get confused when the current default sink gets
removed. It would incorrectly think that if there's no explicitly
configured default sink, then there's no default sink at all. Even
worse, when the D-Bus thinks that there's no default sink, it concludes
that there are no sinks at all, which made it impossible to configure
the default sink via the D-Bus interface. Now that pa_core.default_sink
is always set, except when there really aren't any sinks, the D-Bus
protocol should behave correctly.

BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=99425
---

Changes in v3:
 - Fixed a crash in module-dbus-protocol: the module would crash if a
   new sink became immediately the default, because the module assumed
   that the sink put hook would always be fired before the default sink
   changed hook.
 - Changed the default source selection logic so that if we're comparing
   two monitor sources, the monitored sinks are compared before
   resorting to checking whether one of the sources is already the
   default.

Changes in v2:
 - Added a note about the D-Bus protocol bug to the commit message.
 - Changed the default sink/source selection logic to prefer the current
   default device when comparing two devices with the same priority.
 - Removed the redundant call to pa_core_update_default_sink/source()
   when unlinking the current configured default sink or source.
   pa_core_set_configured_default_sink/source() will call that function
   anyway.
 - Made the comment on pa_core.default_sink/source a bit more verbose.
 - Dropped the patch that uses the active port's priority as the
   sink/source priority. The discussion is ongoing about what to do
   about that, so I'll submit that patch separately later, or a
   different patch that achieves the same goal.

 src/modules/dbus/iface-core.c               | 114 +++++++++++++------
 src/modules/dbus/iface-sample.c             |  10 +-
 src/modules/module-default-device-restore.c |  14 +--
 src/modules/module-intended-roles.c         |  37 +++---
 src/modules/module-rescue-streams.c         |  20 ++--
 src/modules/module-switch-on-connect.c      |  30 ++---
 src/pulsecore/cli-command.c                 |  20 ++--
 src/pulsecore/cli-text.c                    |  12 +-
 src/pulsecore/core.c                        | 170 ++++++++++++++++++++++++++++
 src/pulsecore/core.h                        |  28 ++++-
 src/pulsecore/namereg.c                     | 115 +------------------
 src/pulsecore/namereg.h                     |   6 -
 src/pulsecore/protocol-native.c             |  19 ++--
 src/pulsecore/sink.c                        |   7 ++
 src/pulsecore/source.c                      |   7 ++
 15 files changed, 370 insertions(+), 239 deletions(-)

diff --git a/src/modules/dbus/iface-core.c b/src/modules/dbus/iface-core.c
index 508913de1..3f368ab46 100644
--- a/src/modules/dbus/iface-core.c
+++ b/src/modules/dbus/iface-core.c
@@ -721,7 +721,7 @@ static void handle_set_fallback_sink(DBusConnection *conn, DBusMessage *msg, DBu
         return;
     }
 
-    pa_namereg_set_default_sink(c->core, pa_dbusiface_device_get_sink(fallback_sink));
+    pa_core_set_configured_default_sink(c->core, pa_dbusiface_device_get_sink(fallback_sink));
 
     pa_dbus_send_empty_reply(conn, msg);
 }
@@ -809,7 +809,7 @@ static void handle_set_fallback_source(DBusConnection *conn, DBusMessage *msg, D
         return;
     }
 
-    pa_namereg_set_default_source(c->core, pa_dbusiface_device_get_source(fallback_source));
+    pa_core_set_configured_default_source(c->core, pa_dbusiface_device_get_source(fallback_source));
 
     pa_dbus_send_empty_reply(conn, msg);
 }
@@ -1692,6 +1692,28 @@ static pa_hook_result_t sample_cache_removed_cb(void *hook_data, void *call_data
     return PA_HOOK_OK;
 }
 
+static pa_dbusiface_device *create_dbus_object_for_sink(pa_dbusiface_core *c, pa_sink *s) {
+    pa_dbusiface_device *d;
+    const char *object_path;
+    DBusMessage *signal_msg;
+
+    d = pa_dbusiface_device_new_sink(c, s);
+    object_path = pa_dbusiface_device_get_path(d);
+
+    pa_assert_se(pa_hashmap_put(c->sinks_by_index, PA_UINT32_TO_PTR(s->index), d) >= 0);
+    pa_assert_se(pa_hashmap_put(c->sinks_by_path, (char *) object_path, d) >= 0);
+
+    pa_assert_se((signal_msg = dbus_message_new_signal(PA_DBUS_CORE_OBJECT_PATH,
+                                                       PA_DBUS_CORE_INTERFACE,
+                                                       signals[SIGNAL_NEW_SINK].name)));
+    pa_assert_se(dbus_message_append_args(signal_msg, DBUS_TYPE_OBJECT_PATH, &object_path, DBUS_TYPE_INVALID));
+
+    pa_dbus_protocol_send_signal(c->dbus_protocol, signal_msg);
+    dbus_message_unref(signal_msg);
+
+    return d;
+}
+
 static pa_hook_result_t default_sink_changed_cb(void *hook_data, void *call_data, void *slot_data) {
     pa_dbusiface_core *c = slot_data;
     pa_sink *new_fallback_sink = call_data;
@@ -1707,7 +1729,15 @@ static pa_hook_result_t default_sink_changed_cb(void *hook_data, void *call_data
         c->fallback_sink = new_fallback_sink ? pa_sink_ref(new_fallback_sink) : NULL;
 
         if (c->fallback_sink) {
-            pa_assert_se((device_iface = pa_hashmap_get(c->sinks_by_index, PA_UINT32_TO_PTR(c->fallback_sink->index))));
+            device_iface = pa_hashmap_get(c->sinks_by_index, PA_UINT32_TO_PTR(c->fallback_sink->index));
+
+            /* It's possible that we haven't created a dbus object for the
+             * source yet, because if a new source immediately becomes the
+             * default source, the default source change hook is fired before
+             * the put hook. */
+            if (!device_iface)
+                device_iface = create_dbus_object_for_sink(c, c->fallback_sink);
+
             object_path = pa_dbusiface_device_get_path(device_iface);
 
             pa_assert_se((signal_msg = dbus_message_new_signal(PA_DBUS_CORE_OBJECT_PATH,
@@ -1730,6 +1760,28 @@ static pa_hook_result_t default_sink_changed_cb(void *hook_data, void *call_data
     return PA_HOOK_OK;
 }
 
+static pa_dbusiface_device *create_dbus_object_for_source(pa_dbusiface_core *c, pa_source *s) {
+    pa_dbusiface_device *d;
+    const char *object_path;
+    DBusMessage *signal_msg;
+
+    d = pa_dbusiface_device_new_source(c, s);
+    object_path = pa_dbusiface_device_get_path(d);
+
+    pa_assert_se(pa_hashmap_put(c->sources_by_index, PA_UINT32_TO_PTR(s->index), d) >= 0);
+    pa_assert_se(pa_hashmap_put(c->sources_by_path, (char *) object_path, d) >= 0);
+
+    pa_assert_se((signal_msg = dbus_message_new_signal(PA_DBUS_CORE_OBJECT_PATH,
+                                                       PA_DBUS_CORE_INTERFACE,
+                                                       signals[SIGNAL_NEW_SOURCE].name)));
+    pa_assert_se(dbus_message_append_args(signal_msg, DBUS_TYPE_OBJECT_PATH, &object_path, DBUS_TYPE_INVALID));
+
+    pa_dbus_protocol_send_signal(c->dbus_protocol, signal_msg);
+    dbus_message_unref(signal_msg);
+
+    return d;
+}
+
 static pa_hook_result_t default_source_changed_cb(void *hook_data, void *call_data, void *slot_data) {
     pa_dbusiface_core *c = slot_data;
     pa_source *new_fallback_source = call_data;
@@ -1745,7 +1797,15 @@ static pa_hook_result_t default_source_changed_cb(void *hook_data, void *call_da
         c->fallback_source = new_fallback_source ? pa_source_ref(new_fallback_source) : NULL;
 
         if (c->fallback_source) {
-            pa_assert_se((device_iface = pa_hashmap_get(c->sources_by_index, PA_UINT32_TO_PTR(c->fallback_source->index))));
+            device_iface = pa_hashmap_get(c->sources_by_index, PA_UINT32_TO_PTR(c->fallback_source->index));
+
+            /* It's possible that we haven't created a dbus object for the
+             * source yet, because if a new source immediately becomes the
+             * default source, the default source change hook is fired before
+             * the put hook. */
+            if (!device_iface)
+                device_iface = create_dbus_object_for_source(c, c->fallback_source);
+
             object_path = pa_dbusiface_device_get_path(device_iface);
 
             pa_assert_se((signal_msg = dbus_message_new_signal(PA_DBUS_CORE_OBJECT_PATH,
@@ -1983,26 +2043,17 @@ static pa_hook_result_t client_unlink_cb(void *hook_data, void *call_data, void
 static pa_hook_result_t sink_put_cb(void *hook_data, void *call_data, void *slot_data) {
     pa_dbusiface_core *c = slot_data;
     pa_sink *s = call_data;
-    pa_dbusiface_device *d = NULL;
-    const char *object_path = NULL;
-    DBusMessage *signal_msg = NULL;
 
     pa_assert(c);
     pa_assert(s);
 
-    d = pa_dbusiface_device_new_sink(c, s);
-    object_path = pa_dbusiface_device_get_path(d);
-
-    pa_assert_se(pa_hashmap_put(c->sinks_by_index, PA_UINT32_TO_PTR(s->index), d) >= 0);
-    pa_assert_se(pa_hashmap_put(c->sinks_by_path, (char *) object_path, d) >= 0);
-
-    pa_assert_se(signal_msg = dbus_message_new_signal(PA_DBUS_CORE_OBJECT_PATH,
-                                                      PA_DBUS_CORE_INTERFACE,
-                                                      signals[SIGNAL_NEW_SINK].name));
-    pa_assert_se(dbus_message_append_args(signal_msg, DBUS_TYPE_OBJECT_PATH, &object_path, DBUS_TYPE_INVALID));
+    /* We may have alredy encountered this sink, because if the new sink was
+     * chosen as the default sink, the default sink change hook was fired
+     * first, and we saw the sink in default_sink_changed_cb(). */
+    if (pa_hashmap_get(c->sinks_by_index, PA_UINT32_TO_PTR(s->index)))
+        return PA_HOOK_OK;
 
-    pa_dbus_protocol_send_signal(c->dbus_protocol, signal_msg);
-    dbus_message_unref(signal_msg);
+    create_dbus_object_for_sink(c, s);
 
     return PA_HOOK_OK;
 }
@@ -2037,26 +2088,17 @@ static pa_hook_result_t sink_unlink_cb(void *hook_data, void *call_data, void *s
 static pa_hook_result_t source_put_cb(void *hook_data, void *call_data, void *slot_data) {
     pa_dbusiface_core *c = slot_data;
     pa_source *s = call_data;
-    pa_dbusiface_device *d = NULL;
-    const char *object_path = NULL;
-    DBusMessage *signal_msg = NULL;
 
     pa_assert(c);
     pa_assert(s);
 
-    d = pa_dbusiface_device_new_source(c, s);
-    object_path = pa_dbusiface_device_get_path(d);
-
-    pa_assert_se(pa_hashmap_put(c->sources_by_index, PA_UINT32_TO_PTR(s->index), d) >= 0);
-    pa_assert_se(pa_hashmap_put(c->sources_by_path, (char *) object_path, d) >= 0);
-
-    pa_assert_se((signal_msg = dbus_message_new_signal(PA_DBUS_CORE_OBJECT_PATH,
-                                                       PA_DBUS_CORE_INTERFACE,
-                                                       signals[SIGNAL_NEW_SOURCE].name)));
-    pa_assert_se(dbus_message_append_args(signal_msg, DBUS_TYPE_OBJECT_PATH, &object_path, DBUS_TYPE_INVALID));
+    /* We may have alredy encountered this source, because if the new source
+     * was chosen as the default source, the default source change hook was
+     * fired first, and we saw the source in default_source_changed_cb(). */
+    if (pa_hashmap_get(c->sources_by_index, PA_UINT32_TO_PTR(s->index)))
+        return PA_HOOK_OK;
 
-    pa_dbus_protocol_send_signal(c->dbus_protocol, signal_msg);
-    dbus_message_unref(signal_msg);
+    create_dbus_object_for_source(c, s);
 
     return PA_HOOK_OK;
 }
@@ -2158,8 +2200,8 @@ pa_dbusiface_core *pa_dbusiface_core_new(pa_core *core) {
     c->samples = pa_hashmap_new_full(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func, NULL, (pa_free_cb_t) pa_dbusiface_sample_free);
     c->modules = pa_hashmap_new_full(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func, NULL, (pa_free_cb_t) pa_dbusiface_module_free);
     c->clients = pa_hashmap_new_full(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func, NULL, (pa_free_cb_t) pa_dbusiface_client_free);
-    c->fallback_sink = pa_namereg_get_default_sink(core);
-    c->fallback_source = pa_namereg_get_default_source(core);
+    c->fallback_sink = core->default_sink;
+    c->fallback_source = core->default_source;
     c->default_sink_changed_slot = pa_hook_connect(&core->hooks[PA_CORE_HOOK_DEFAULT_SINK_CHANGED],
                                                    PA_HOOK_NORMAL, default_sink_changed_cb, c);
     c->default_source_changed_slot = pa_hook_connect(&core->hooks[PA_CORE_HOOK_DEFAULT_SOURCE_CHANGED],
diff --git a/src/modules/dbus/iface-sample.c b/src/modules/dbus/iface-sample.c
index 61f2ba091..51189196d 100644
--- a/src/modules/dbus/iface-sample.c
+++ b/src/modules/dbus/iface-sample.c
@@ -352,7 +352,6 @@ static void handle_play(DBusConnection *conn, DBusMessage *msg, void *userdata)
     DBusMessageIter msg_iter;
     dbus_uint32_t volume = 0;
     pa_proplist *property_list = NULL;
-    pa_sink *sink = NULL;
 
     pa_assert(conn);
     pa_assert(msg);
@@ -370,13 +369,18 @@ static void handle_play(DBusConnection *conn, DBusMessage *msg, void *userdata)
         goto finish;
     }
 
-    if (!(sink = pa_namereg_get_default_sink(s->sample->core))) {
+    if (!s->sample->core->default_sink) {
         pa_dbus_send_error(conn, msg, DBUS_ERROR_FAILED,
                            "Can't play sample %s, because there are no sinks available.", s->sample->name);
         goto finish;
     }
 
-    if (pa_scache_play_item(s->sample->core, s->sample->name, sink, volume, property_list, NULL) < 0) {
+    if (pa_scache_play_item(s->sample->core,
+                            s->sample->name,
+                            s->sample->core->default_sink,
+                            volume,
+                            property_list,
+                            NULL) < 0) {
         pa_dbus_send_error(conn, msg, DBUS_ERROR_FAILED, "Playing sample %s failed.", s->sample->name);
         goto finish;
     }
diff --git a/src/modules/module-default-device-restore.c b/src/modules/module-default-device-restore.c
index d76e28e68..56fee67f8 100644
--- a/src/modules/module-default-device-restore.c
+++ b/src/modules/module-default-device-restore.c
@@ -56,7 +56,7 @@ static void load(struct userdata *u) {
 
     /* We never overwrite manually configured settings */
 
-    if (u->core->default_sink)
+    if (u->core->configured_default_sink)
         pa_log_info("Manually configured default sink, not overwriting.");
     else if ((f = pa_fopen_cloexec(u->sink_filename, "r"))) {
         char ln[256] = "";
@@ -69,7 +69,7 @@ static void load(struct userdata *u) {
         if (!ln[0])
             pa_log_info("No previous default sink setting, ignoring.");
         else if ((s = pa_namereg_get(u->core, ln, PA_NAMEREG_SINK))) {
-            pa_namereg_set_default_sink(u->core, s);
+            pa_core_set_configured_default_sink(u->core, s);
             pa_log_info("Restored default sink '%s'.", ln);
         } else
             pa_log_info("Saved default sink '%s' not existent, not restoring default sink setting.", ln);
@@ -77,7 +77,7 @@ static void load(struct userdata *u) {
     } else if (errno != ENOENT)
         pa_log("Failed to load default sink: %s", pa_cstrerror(errno));
 
-    if (u->core->default_source)
+    if (u->core->configured_default_source)
         pa_log_info("Manually configured default source, not overwriting.");
     else if ((f = pa_fopen_cloexec(u->source_filename, "r"))) {
         char ln[256] = "";
@@ -90,7 +90,7 @@ static void load(struct userdata *u) {
         if (!ln[0])
             pa_log_info("No previous default source setting, ignoring.");
         else if ((s = pa_namereg_get(u->core, ln, PA_NAMEREG_SOURCE))) {
-            pa_namereg_set_default_source(u->core, s);
+            pa_core_set_configured_default_source(u->core, s);
             pa_log_info("Restored default source '%s'.", ln);
         } else
             pa_log_info("Saved default source '%s' not existent, not restoring default source setting.", ln);
@@ -107,8 +107,7 @@ static void save(struct userdata *u) {
 
     if (u->sink_filename) {
         if ((f = pa_fopen_cloexec(u->sink_filename, "w"))) {
-            pa_sink *s = pa_namereg_get_default_sink(u->core);
-            fprintf(f, "%s\n", s ? s->name : "");
+            fprintf(f, "%s\n", u->core->default_sink ? u->core->default_sink->name : "");
             fclose(f);
         } else
             pa_log("Failed to save default sink: %s", pa_cstrerror(errno));
@@ -116,8 +115,7 @@ static void save(struct userdata *u) {
 
     if (u->source_filename) {
         if ((f = pa_fopen_cloexec(u->source_filename, "w"))) {
-            pa_source *s = pa_namereg_get_default_source(u->core);
-            fprintf(f, "%s\n", s ? s->name : "");
+            fprintf(f, "%s\n", u->core->default_source ? u->core->default_source->name : "");
             fclose(f);
         } else
             pa_log("Failed to save default source: %s", pa_cstrerror(errno));
diff --git a/src/modules/module-intended-roles.c b/src/modules/module-intended-roles.c
index 60ec7e982..f906b8800 100644
--- a/src/modules/module-intended-roles.c
+++ b/src/modules/module-intended-roles.c
@@ -69,7 +69,7 @@ static bool role_match(pa_proplist *proplist, const char *role) {
 
 static pa_hook_result_t sink_input_new_hook_callback(pa_core *c, pa_sink_input_new_data *new_data, struct userdata *u) {
     const char *role;
-    pa_sink *s, *def;
+    pa_sink *s;
     uint32_t idx;
 
     pa_assert(c);
@@ -92,13 +92,13 @@ static pa_hook_result_t sink_input_new_hook_callback(pa_core *c, pa_sink_input_n
     }
 
     /* Prefer the default sink over any other sink, just in case... */
-    if ((def = pa_namereg_get_default_sink(c)))
-        if (role_match(def->proplist, role) && pa_sink_input_new_data_set_sink(new_data, def, false))
+    if (c->default_sink)
+        if (role_match(c->default_sink->proplist, role) && pa_sink_input_new_data_set_sink(new_data, c->default_sink, false))
             return PA_HOOK_OK;
 
     /* @todo: favour the highest priority device, not the first one we find? */
     PA_IDXSET_FOREACH(s, c->sinks, idx) {
-        if (s == def)
+        if (s == c->default_sink)
             continue;
 
         if (!PA_SINK_IS_LINKED(pa_sink_get_state(s)))
@@ -113,7 +113,7 @@ static pa_hook_result_t sink_input_new_hook_callback(pa_core *c, pa_sink_input_n
 
 static pa_hook_result_t source_output_new_hook_callback(pa_core *c, pa_source_output_new_data *new_data, struct userdata *u) {
     const char *role;
-    pa_source *s, *def;
+    pa_source *s;
     uint32_t idx;
 
     pa_assert(c);
@@ -136,9 +136,9 @@ static pa_hook_result_t source_output_new_hook_callback(pa_core *c, pa_source_ou
     }
 
     /* Prefer the default source over any other source, just in case... */
-    if ((def = pa_namereg_get_default_source(c)))
-        if (role_match(def->proplist, role)) {
-            pa_source_output_new_data_set_source(new_data, def, false);
+    if (c->default_source)
+        if (role_match(c->default_source->proplist, role)) {
+            pa_source_output_new_data_set_source(new_data, c->default_source, false);
             return PA_HOOK_OK;
         }
 
@@ -146,7 +146,7 @@ static pa_hook_result_t source_output_new_hook_callback(pa_core *c, pa_source_ou
         if (s->monitor_of)
             continue;
 
-        if (s == def)
+        if (s == c->default_source)
             continue;
 
         if (!PA_SOURCE_IS_LINKED(pa_source_get_state(s)))
@@ -259,7 +259,6 @@ static pa_hook_result_t source_put_hook_callback(pa_core *c, pa_source *source,
 static pa_hook_result_t sink_unlink_hook_callback(pa_core *c, pa_sink *sink, struct userdata *u) {
     pa_sink_input *si;
     uint32_t idx;
-    pa_sink *def;
 
     pa_assert(c);
     pa_assert(sink);
@@ -271,7 +270,7 @@ static pa_hook_result_t sink_unlink_hook_callback(pa_core *c, pa_sink *sink, str
         return PA_HOOK_OK;
 
     /* If there not default sink, then there is no sink at all */
-    if (!(def = pa_namereg_get_default_sink(c)))
+    if (!c->default_sink)
         return PA_HOOK_OK;
 
     PA_IDXSET_FOREACH(si, sink->inputs, idx) {
@@ -286,14 +285,14 @@ static pa_hook_result_t sink_unlink_hook_callback(pa_core *c, pa_sink *sink, str
             continue;
 
         /* Would the default sink fit? If so, let's use it */
-        if (def != sink && role_match(def->proplist, role))
-            if (pa_sink_input_move_to(si, def, false) >= 0)
+        if (c->default_sink != sink && role_match(c->default_sink->proplist, role))
+            if (pa_sink_input_move_to(si, c->default_sink, false) >= 0)
                 continue;
 
         /* Try to find some other fitting sink */
         /* @todo: favour the highest priority device, not the first one we find? */
         PA_IDXSET_FOREACH(d, c->sinks, jdx) {
-            if (d == def || d == sink)
+            if (d == c->default_sink || d == sink)
                 continue;
 
             if (!PA_SINK_IS_LINKED(pa_sink_get_state(d)))
@@ -311,7 +310,6 @@ static pa_hook_result_t sink_unlink_hook_callback(pa_core *c, pa_sink *sink, str
 static pa_hook_result_t source_unlink_hook_callback(pa_core *c, pa_source *source, struct userdata *u) {
     pa_source_output *so;
     uint32_t idx;
-    pa_source *def;
 
     pa_assert(c);
     pa_assert(source);
@@ -323,7 +321,7 @@ static pa_hook_result_t source_unlink_hook_callback(pa_core *c, pa_source *sourc
         return PA_HOOK_OK;
 
     /* If there not default source, then there is no source at all */
-    if (!(def = pa_namereg_get_default_source(c)))
+    if (!c->default_source)
         return PA_HOOK_OK;
 
     PA_IDXSET_FOREACH(so, source->outputs, idx) {
@@ -341,15 +339,16 @@ static pa_hook_result_t source_unlink_hook_callback(pa_core *c, pa_source *sourc
             continue;
 
         /* Would the default source fit? If so, let's use it */
-        if (def != source && role_match(def->proplist, role) && !source->monitor_of == !def->monitor_of) {
-            pa_source_output_move_to(so, def, false);
+        if (c->default_source != source && role_match(c->default_source->proplist, role)
+                && !source->monitor_of == !c->default_source->monitor_of) {
+            pa_source_output_move_to(so, c->default_source, false);
             continue;
         }
 
         /* Try to find some other fitting source */
         /* @todo: favour the highest priority device, not the first one we find? */
         PA_IDXSET_FOREACH(d, c->sources, jdx) {
-            if (d == def || d == source)
+            if (d == c->default_source || d == source)
                 continue;
 
             if (!PA_SOURCE_IS_LINKED(pa_source_get_state(d)))
diff --git a/src/modules/module-rescue-streams.c b/src/modules/module-rescue-streams.c
index 60ac1c4cf..d3c9953ec 100644
--- a/src/modules/module-rescue-streams.c
+++ b/src/modules/module-rescue-streams.c
@@ -96,7 +96,7 @@ static void build_group_ports(pa_hashmap *g_ports, pa_hashmap *s_ports) {
 }
 
 static pa_sink* find_evacuation_sink(pa_core *c, pa_sink_input *i, pa_sink *skip) {
-    pa_sink *target, *def, *fb_sink = NULL;
+    pa_sink *target, *fb_sink = NULL;
     uint32_t idx;
     pa_hashmap *all_ports;
     pa_device_port *best_port;
@@ -104,15 +104,13 @@ static pa_sink* find_evacuation_sink(pa_core *c, pa_sink_input *i, pa_sink *skip
     pa_assert(c);
     pa_assert(i);
 
-    def = pa_namereg_get_default_sink(c);
-
-    if (def && def != skip && pa_sink_input_may_move_to(i, def))
-        return def;
+    if (c->default_sink && c->default_sink != skip && pa_sink_input_may_move_to(i, c->default_sink))
+        return c->default_sink;
 
     all_ports = pa_hashmap_new(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func);
 
     PA_IDXSET_FOREACH(target, c->sinks, idx) {
-        if (target == def)
+        if (target == c->default_sink)
             continue;
 
         if (target == skip)
@@ -204,7 +202,7 @@ static pa_hook_result_t sink_input_move_fail_hook_callback(pa_core *c, pa_sink_i
 }
 
 static pa_source* find_evacuation_source(pa_core *c, pa_source_output *o, pa_source *skip) {
-    pa_source *target, *def, *fb_source = NULL;
+    pa_source *target, *fb_source = NULL;
     uint32_t idx;
     pa_hashmap *all_ports;
     pa_device_port *best_port;
@@ -212,15 +210,13 @@ static pa_source* find_evacuation_source(pa_core *c, pa_source_output *o, pa_sou
     pa_assert(c);
     pa_assert(o);
 
-    def = pa_namereg_get_default_source(c);
-
-    if (def && def != skip && pa_source_output_may_move_to(o, def))
-        return def;
+    if (c->default_source && c->default_source != skip && pa_source_output_may_move_to(o, c->default_source))
+        return c->default_source;
 
     all_ports = pa_hashmap_new(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func);
 
     PA_IDXSET_FOREACH(target, c->sources, idx) {
-        if (target == def)
+        if (target == c->default_source)
             continue;
 
         if (target == skip)
diff --git a/src/modules/module-switch-on-connect.c b/src/modules/module-switch-on-connect.c
index c844add6e..776c923ee 100644
--- a/src/modules/module-switch-on-connect.c
+++ b/src/modules/module-switch-on-connect.c
@@ -55,7 +55,7 @@ struct userdata {
 static pa_hook_result_t sink_put_hook_callback(pa_core *c, pa_sink *sink, void* userdata) {
     pa_sink_input *i;
     uint32_t idx;
-    pa_sink *def;
+    pa_sink *old_default_sink;
     const char *s;
     struct userdata *u = userdata;
 
@@ -75,24 +75,25 @@ static pa_hook_result_t sink_put_hook_callback(pa_core *c, pa_sink *sink, void*
             return PA_HOOK_OK;
     }
 
-    def = pa_namereg_get_default_sink(c);
-    if (def == sink)
+    if (c->default_sink == sink)
         return PA_HOOK_OK;
 
     if (u->only_from_unavailable)
-        if (!def->active_port || def->active_port->available != PA_AVAILABLE_NO)
+        if (!c->default_sink->active_port || c->default_sink->active_port->available != PA_AVAILABLE_NO)
             return PA_HOOK_OK;
 
+    old_default_sink = c->default_sink;
+
     /* Actually do the switch to the new sink */
-    pa_namereg_set_default_sink(c, sink);
+    pa_core_set_configured_default_sink(c, sink);
 
     /* Now move all old inputs over */
-    if (pa_idxset_size(def->inputs) <= 0) {
+    if (pa_idxset_size(old_default_sink->inputs) <= 0) {
         pa_log_debug("No sink inputs to move away.");
         return PA_HOOK_OK;
     }
 
-    PA_IDXSET_FOREACH(i, def->inputs, idx) {
+    PA_IDXSET_FOREACH(i, old_default_sink->inputs, idx) {
         if (i->save_sink || !PA_SINK_INPUT_IS_LINKED(i->state))
             continue;
 
@@ -110,7 +111,7 @@ static pa_hook_result_t sink_put_hook_callback(pa_core *c, pa_sink *sink, void*
 static pa_hook_result_t source_put_hook_callback(pa_core *c, pa_source *source, void* userdata) {
     pa_source_output *o;
     uint32_t idx;
-    pa_source *def;
+    pa_source *old_default_source;
     const char *s;
     struct userdata *u = userdata;
 
@@ -134,24 +135,25 @@ static pa_hook_result_t source_put_hook_callback(pa_core *c, pa_source *source,
             return PA_HOOK_OK;
     }
 
-    def = pa_namereg_get_default_source(c);
-    if (def == source)
+    if (c->default_source == source)
         return PA_HOOK_OK;
 
     if (u->only_from_unavailable)
-        if (!def->active_port || def->active_port->available != PA_AVAILABLE_NO)
+        if (!c->default_source->active_port || c->default_source->active_port->available != PA_AVAILABLE_NO)
             return PA_HOOK_OK;
 
+    old_default_source = c->default_source;
+
     /* Actually do the switch to the new source */
-    pa_namereg_set_default_source(c, source);
+    pa_core_set_configured_default_source(c, source);
 
     /* Now move all old outputs over */
-    if (pa_idxset_size(def->outputs) <= 0) {
+    if (pa_idxset_size(old_default_source->outputs) <= 0) {
         pa_log_debug("No source outputs to move away.");
         return PA_HOOK_OK;
     }
 
-    PA_IDXSET_FOREACH(o, def->outputs, idx) {
+    PA_IDXSET_FOREACH(o, old_default_source->outputs, idx) {
         if (o->save_source || !PA_SOURCE_OUTPUT_IS_LINKED(o->state))
             continue;
 
diff --git a/src/pulsecore/cli-command.c b/src/pulsecore/cli-command.c
index 9a7360582..5a632be45 100644
--- a/src/pulsecore/cli-command.c
+++ b/src/pulsecore/cli-command.c
@@ -344,8 +344,6 @@ static int pa_cli_command_stat(pa_core *c, pa_tokenizer *t, pa_strbuf *buf, bool
     char bytes[PA_BYTES_SNPRINT_MAX];
     const pa_mempool_stat *mstat;
     unsigned k;
-    pa_sink *def_sink;
-    pa_source *def_source;
 
     static const char* const type_table[PA_MEMBLOCK_TYPE_MAX] = {
         [PA_MEMBLOCK_POOL] = "POOL",
@@ -388,12 +386,10 @@ static int pa_cli_command_stat(pa_core *c, pa_tokenizer *t, pa_strbuf *buf, bool
     pa_strbuf_printf(buf, "Default channel map: %s\n",
                      pa_channel_map_snprint(cm, sizeof(cm), &c->default_channel_map));
 
-    def_sink = pa_namereg_get_default_sink(c);
-    def_source = pa_namereg_get_default_source(c);
     pa_strbuf_printf(buf, "Default sink name: %s\n"
                      "Default source name: %s\n",
-                     def_sink ? def_sink->name : "none",
-                     def_source ? def_source->name : "none");
+                     c->default_sink ? c->default_sink->name : "none",
+                     c->default_source ? c->default_source->name : "none");
 
     for (k = 0; k < PA_MEMBLOCK_TYPE_MAX; k++)
         pa_strbuf_printf(buf,
@@ -1034,7 +1030,7 @@ static int pa_cli_command_sink_default(pa_core *c, pa_tokenizer *t, pa_strbuf *b
     }
 
     if ((s = pa_namereg_get(c, n, PA_NAMEREG_SINK)))
-        pa_namereg_set_default_sink(c, s);
+        pa_core_set_configured_default_sink(c, s);
     else
         pa_strbuf_printf(buf, "Sink %s does not exist.\n", n);
 
@@ -1056,7 +1052,7 @@ static int pa_cli_command_source_default(pa_core *c, pa_tokenizer *t, pa_strbuf
     }
 
     if ((s = pa_namereg_get(c, n, PA_NAMEREG_SOURCE)))
-        pa_namereg_set_default_source(c, s);
+        pa_core_set_configured_default_source(c, s);
     else
         pa_strbuf_printf(buf, "Source %s does not exist.\n", n);
     return 0;
@@ -1850,20 +1846,20 @@ static int pa_cli_command_dump(pa_core *c, pa_tokenizer *t, pa_strbuf *buf, bool
     }
 
     nl = false;
-    if ((sink = pa_namereg_get_default_sink(c))) {
+    if (c->default_sink) {
         if (!nl) {
             pa_strbuf_puts(buf, "\n");
             nl = true;
         }
 
-        pa_strbuf_printf(buf, "set-default-sink %s\n", sink->name);
+        pa_strbuf_printf(buf, "set-default-sink %s\n", c->default_sink->name);
     }
 
-    if ((source = pa_namereg_get_default_source(c))) {
+    if (c->default_source) {
         if (!nl)
             pa_strbuf_puts(buf, "\n");
 
-        pa_strbuf_printf(buf, "set-default-source %s\n", source->name);
+        pa_strbuf_printf(buf, "set-default-source %s\n", c->default_source->name);
     }
 
     pa_strbuf_puts(buf, "\n### EOF\n");
diff --git a/src/pulsecore/cli-text.c b/src/pulsecore/cli-text.c
index af79a1ebe..ded82f6e4 100644
--- a/src/pulsecore/cli-text.c
+++ b/src/pulsecore/cli-text.c
@@ -232,7 +232,7 @@ static const char *source_state_to_string(pa_source_state_t state) {
 
 char *pa_sink_list_to_string(pa_core *c) {
     pa_strbuf *s;
-    pa_sink *sink, *default_sink;
+    pa_sink *sink;
     uint32_t idx = PA_IDXSET_INVALID;
     pa_assert(c);
 
@@ -240,8 +240,6 @@ char *pa_sink_list_to_string(pa_core *c) {
 
     pa_strbuf_printf(s, "%u sink(s) available.\n", pa_idxset_size(c->sinks));
 
-    default_sink = pa_namereg_get_default_sink(c);
-
     PA_IDXSET_FOREACH(sink, c->sinks, idx) {
         char ss[PA_SAMPLE_SPEC_SNPRINT_MAX],
             cv[PA_CVOLUME_SNPRINT_VERBOSE_MAX],
@@ -273,7 +271,7 @@ char *pa_sink_list_to_string(pa_core *c) {
             "\tchannel map: %s%s%s\n"
             "\tused by: %u\n"
             "\tlinked by: %u\n",
-            sink == default_sink ? '*' : ' ',
+            sink == c->default_sink ? '*' : ' ',
             sink->index,
             sink->name,
             sink->driver,
@@ -350,7 +348,7 @@ char *pa_sink_list_to_string(pa_core *c) {
 
 char *pa_source_list_to_string(pa_core *c) {
     pa_strbuf *s;
-    pa_source *source, *default_source;
+    pa_source *source;
     uint32_t idx = PA_IDXSET_INVALID;
     pa_assert(c);
 
@@ -358,8 +356,6 @@ char *pa_source_list_to_string(pa_core *c) {
 
     pa_strbuf_printf(s, "%u source(s) available.\n", pa_idxset_size(c->sources));
 
-    default_source = pa_namereg_get_default_source(c);
-
     PA_IDXSET_FOREACH(source, c->sources, idx) {
         char ss[PA_SAMPLE_SPEC_SNPRINT_MAX],
             cv[PA_CVOLUME_SNPRINT_VERBOSE_MAX],
@@ -389,7 +385,7 @@ char *pa_source_list_to_string(pa_core *c) {
             "\tchannel map: %s%s%s\n"
             "\tused by: %u\n"
             "\tlinked by: %u\n",
-            source == default_source ? '*' : ' ',
+            source == c->default_source ? '*' : ' ',
             source->index,
             source->name,
             source->driver,
diff --git a/src/pulsecore/core.c b/src/pulsecore/core.c
index afdb0a4ca..16fd040a4 100644
--- a/src/pulsecore/core.c
+++ b/src/pulsecore/core.c
@@ -224,6 +224,176 @@ static void core_free(pa_object *o) {
     pa_xfree(c);
 }
 
+void pa_core_set_configured_default_sink(pa_core *core, pa_sink *sink) {
+    pa_sink *old_sink;
+
+    pa_assert(core);
+
+    old_sink = core->configured_default_sink;
+
+    if (sink == old_sink)
+        return;
+
+    core->configured_default_sink = sink;
+    pa_log_info("configured_default_sink: %s -> %s",
+                old_sink ? old_sink->name : "(unset)", sink ? sink->name : "(unset)");
+
+    pa_core_update_default_sink(core);
+}
+
+void pa_core_set_configured_default_source(pa_core *core, pa_source *source) {
+    pa_source *old_source;
+
+    pa_assert(core);
+
+    old_source = core->configured_default_source;
+
+    if (source == old_source)
+        return;
+
+    core->configured_default_source = source;
+    pa_log_info("configured_default_source: %s -> %s",
+                old_source ? old_source->name : "(unset)", source ? source->name : "(unset)");
+
+    pa_core_update_default_source(core);
+}
+
+/* a  < b  ->  return -1
+ * a == b  ->  return  0
+ * a  > b  ->  return  1 */
+static int compare_sinks(pa_sink *a, pa_sink *b) {
+    pa_core *core;
+
+    core = a->core;
+
+    /* The configured default sink is preferred over any other sink. */
+    if (b == core->configured_default_sink)
+        return -1;
+    if (a == core->configured_default_sink)
+        return 1;
+
+    if (a->priority < b->priority)
+        return -1;
+    if (a->priority > b->priority)
+        return 1;
+
+    /* It's hard to find any difference between these sinks, but maybe one of
+     * them is already the default sink? If so, it's best to keep it as the
+     * default to avoid changing the routing for no good reason. */
+    if (b == core->default_sink)
+        return -1;
+    if (a == core->default_sink)
+        return 1;
+
+    return 0;
+}
+
+void pa_core_update_default_sink(pa_core *core) {
+    pa_sink *best = NULL;
+    pa_sink *sink;
+    uint32_t idx;
+    pa_sink *old_default_sink;
+
+    pa_assert(core);
+
+    PA_IDXSET_FOREACH(sink, core->sinks, idx) {
+        if (!best) {
+            best = sink;
+            continue;
+        }
+
+        if (compare_sinks(sink, best) > 0)
+            best = sink;
+    }
+
+    old_default_sink = core->default_sink;
+
+    if (best == old_default_sink)
+        return;
+
+    core->default_sink = best;
+    pa_log_info("default_sink: %s -> %s",
+                old_default_sink ? old_default_sink->name : "(unset)", best ? best->name : "(unset)");
+
+    /* If the default sink changed, it may be that the default source has to be
+     * changed too, because monitor sources are prioritized partly based on the
+     * priorities of the monitored sinks. */
+    pa_core_update_default_source(core);
+
+    pa_subscription_post(core, PA_SUBSCRIPTION_EVENT_SERVER | PA_SUBSCRIPTION_EVENT_CHANGE, PA_INVALID_INDEX);
+    pa_hook_fire(&core->hooks[PA_CORE_HOOK_DEFAULT_SINK_CHANGED], core->default_sink);
+}
+
+/* a  < b  ->  return -1
+ * a == b  ->  return  0
+ * a  > b  ->  return  1 */
+static int compare_sources(pa_source *a, pa_source *b) {
+    pa_core *core;
+
+    core = a->core;
+
+    /* The configured default source is preferred over any other source. */
+    if (b == core->configured_default_source)
+        return -1;
+    if (a == core->configured_default_source)
+        return 1;
+
+    /* Monitor sources lose to non-monitor sources. */
+    if (a->monitor_of && !b->monitor_of)
+        return -1;
+    if (!a->monitor_of && b->monitor_of)
+        return 1;
+
+    if (a->priority < b->priority)
+        return -1;
+    if (a->priority > b->priority)
+        return 1;
+
+    /* If the sources are monitors, we can compare the monitored sinks. */
+    if (a->monitor_of)
+        return compare_sinks(a->monitor_of, b->monitor_of);
+
+    /* It's hard to find any difference between these sources, but maybe one of
+     * them is already the default source? If so, it's best to keep it as the
+     * default to avoid changing the routing for no good reason. */
+    if (b == core->default_source)
+        return -1;
+    if (a == core->default_source)
+        return 1;
+
+    return 0;
+}
+
+void pa_core_update_default_source(pa_core *core) {
+    pa_source *best = NULL;
+    pa_source *source;
+    uint32_t idx;
+    pa_source *old_default_source;
+
+    pa_assert(core);
+
+    PA_IDXSET_FOREACH(source, core->sources, idx) {
+        if (!best) {
+            best = source;
+            continue;
+        }
+
+        if (compare_sources(source, best) > 0)
+            best = source;
+    }
+
+    old_default_source = core->default_source;
+
+    if (best == old_default_source)
+        return;
+
+    core->default_source = best;
+    pa_log_info("default_source: %s -> %s",
+                old_default_source ? old_default_source->name : "(unset)", best ? best->name : "(unset)");
+    pa_subscription_post(core, PA_SUBSCRIPTION_EVENT_SERVER | PA_SUBSCRIPTION_EVENT_CHANGE, PA_INVALID_INDEX);
+    pa_hook_fire(&core->hooks[PA_CORE_HOOK_DEFAULT_SOURCE_CHANGED], core->default_source);
+}
+
 static void exit_callback(pa_mainloop_api *m, pa_time_event *e, const struct timeval *t, void *userdata) {
     pa_core *c = userdata;
     pa_assert(c->exit_event == e);
diff --git a/src/pulsecore/core.h b/src/pulsecore/core.h
index 212f6f711..33000f434 100644
--- a/src/pulsecore/core.h
+++ b/src/pulsecore/core.h
@@ -160,9 +160,18 @@ struct pa_core {
     /* Some hashmaps for all sorts of entities */
     pa_hashmap *namereg, *shared;
 
-    /* The default sink/source */
-    pa_source *default_source;
+    /* The default sink/source as configured by the user. If the user hasn't
+     * explicitly configured anything, these are set to NULL. */
+    pa_sink *configured_default_sink;
+    pa_source *configured_default_source;
+
+    /* The effective default sink/source. If no sink or source is explicitly
+     * configured as the default, we pick the device that ranks highest
+     * according to the compare_sinks() and compare_sources() functions in
+     * core.c. pa_core_update_default_sink/source() has to be called whenever
+     * anything changes that might change the comparison results. */
     pa_sink *default_sink;
+    pa_source *default_source;
 
     pa_channel_map default_channel_map;
     pa_sample_spec default_sample_spec;
@@ -225,6 +234,21 @@ enum {
 
 pa_core* pa_core_new(pa_mainloop_api *m, bool shared, bool enable_memfd, size_t shm_size);
 
+void pa_core_set_configured_default_sink(pa_core *core, pa_sink *sink);
+void pa_core_set_configured_default_source(pa_core *core, pa_source *source);
+
+/* These should be called whenever something changes that may affect the
+ * default sink or source choice.
+ *
+ * If the default source choice happens between two monitor sources, the
+ * monitored sinks are compared, so if the default sink changes, the default
+ * source may change too. However, pa_core_update_default_sink() calls
+ * pa_core_update_default_source() internally, so it's sufficient to only call
+ * pa_core_update_default_sink() when something happens that affects the sink
+ * ordering. */
+void pa_core_update_default_sink(pa_core *core);
+void pa_core_update_default_source(pa_core *core);
+
 /* Check whether no one is connected to this core */
 void pa_core_check_idle(pa_core *c);
 
diff --git a/src/pulsecore/namereg.c b/src/pulsecore/namereg.c
index 47bfc087f..0b7388592 100644
--- a/src/pulsecore/namereg.c
+++ b/src/pulsecore/namereg.c
@@ -168,17 +168,6 @@ const char *pa_namereg_register(pa_core *c, const char *name, pa_namereg_type_t
 
     pa_assert_se(pa_hashmap_put(c->namereg, e->name, e) >= 0);
 
-    /* If a sink or source is registered and there was none registered
-     * before we inform the clients which then can ask for the default
-     * sink/source which is then assigned. We don't adjust the default
-     * sink/source here right away to give the module the chance to
-     * register more sinks/sources before we choose a new default
-     * sink/source. */
-
-    if ((!c->default_sink && type == PA_NAMEREG_SINK) ||
-        (!c->default_source && type == PA_NAMEREG_SOURCE))
-        pa_subscription_post(c, PA_SUBSCRIPTION_EVENT_SERVER|PA_SUBSCRIPTION_EVENT_CHANGE, PA_INVALID_INDEX);
-
     return e->name;
 }
 
@@ -189,12 +178,6 @@ void pa_namereg_unregister(pa_core *c, const char *name) {
     pa_assert(name);
 
     pa_assert_se(e = pa_hashmap_remove(c->namereg, name));
-
-    if (c->default_sink == e->data)
-        pa_namereg_set_default_sink(c, NULL);
-    else if (c->default_source == e->data)
-        pa_namereg_set_default_source(c, NULL);
-
     pa_xfree(e->name);
     pa_xfree(e);
 }
@@ -205,22 +188,16 @@ void* pa_namereg_get(pa_core *c, const char *name, pa_namereg_type_t type) {
     pa_assert(c);
 
     if (type == PA_NAMEREG_SOURCE && (!name || pa_streq(name, "@DEFAULT_SOURCE@"))) {
-        pa_source *s;
-
-        if ((s = pa_namereg_get_default_source(c)))
-            return s;
+        return c->default_source;
 
     } else if (type == PA_NAMEREG_SINK && (!name || pa_streq(name, "@DEFAULT_SINK@"))) {
-        pa_sink *s;
-
-        if ((s = pa_namereg_get_default_sink(c)))
-            return s;
+        return c->default_sink;
 
     } else if (type == PA_NAMEREG_SOURCE && name && pa_streq(name, "@DEFAULT_MONITOR@")) {
-        pa_sink *s;
-
-        if ((s = pa_namereg_get(c, NULL, PA_NAMEREG_SINK)))
-            return s->monitor_source;
+        if (c->default_sink)
+            return c->default_sink->monitor_source;
+        else
+            return NULL;
     }
 
     if (!name)
@@ -248,83 +225,3 @@ void* pa_namereg_get(pa_core *c, const char *name, pa_namereg_type_t type) {
 
     return NULL;
 }
-
-pa_sink* pa_namereg_set_default_sink(pa_core*c, pa_sink *s) {
-    pa_assert(c);
-
-    if (s && !PA_SINK_IS_LINKED(pa_sink_get_state(s)))
-        return NULL;
-
-    if (c->default_sink != s) {
-        c->default_sink = s;
-        pa_hook_fire(&c->hooks[PA_CORE_HOOK_DEFAULT_SINK_CHANGED], c->default_sink);
-        pa_subscription_post(c, PA_SUBSCRIPTION_EVENT_SERVER|PA_SUBSCRIPTION_EVENT_CHANGE, PA_INVALID_INDEX);
-    }
-
-    return s;
-}
-
-pa_source* pa_namereg_set_default_source(pa_core*c, pa_source *s) {
-    pa_assert(c);
-
-    if (s && !PA_SOURCE_IS_LINKED(pa_source_get_state(s)))
-        return NULL;
-
-    if (c->default_source != s) {
-        c->default_source = s;
-        pa_hook_fire(&c->hooks[PA_CORE_HOOK_DEFAULT_SOURCE_CHANGED], c->default_source);
-        pa_subscription_post(c, PA_SUBSCRIPTION_EVENT_SERVER|PA_SUBSCRIPTION_EVENT_CHANGE, PA_INVALID_INDEX);
-    }
-
-    return s;
-}
-
-pa_sink *pa_namereg_get_default_sink(pa_core *c) {
-    pa_sink *s, *best = NULL;
-    uint32_t idx;
-
-    pa_assert(c);
-
-    if (c->default_sink && PA_SINK_IS_LINKED(pa_sink_get_state(c->default_sink)))
-        return c->default_sink;
-
-    PA_IDXSET_FOREACH(s, c->sinks, idx)
-        if (PA_SINK_IS_LINKED(pa_sink_get_state(s)))
-            if (!best || s->priority > best->priority)
-                best = s;
-
-    return best;
-}
-
-pa_source *pa_namereg_get_default_source(pa_core *c) {
-    pa_source *s, *best = NULL;
-    uint32_t idx;
-
-    pa_assert(c);
-
-    if (c->default_source && PA_SOURCE_IS_LINKED(pa_source_get_state(c->default_source)))
-        return c->default_source;
-
-    /* First, try to find one that isn't a monitor */
-    PA_IDXSET_FOREACH(s, c->sources, idx)
-        if (!s->monitor_of && PA_SOURCE_IS_LINKED(pa_source_get_state(s)))
-            if (!best ||
-                s->priority > best->priority)
-                best = s;
-
-    if (best)
-        return best;
-
-    /* Then, fallback to a monitor */
-    PA_IDXSET_FOREACH(s, c->sources, idx)
-        if (PA_SOURCE_IS_LINKED(pa_source_get_state(s)))
-            if (!best ||
-                s->priority > best->priority ||
-                (s->priority == best->priority &&
-                 s->monitor_of &&
-                 best->monitor_of &&
-                 s->monitor_of->priority > best->monitor_of->priority))
-                best = s;
-
-    return best;
-}
diff --git a/src/pulsecore/namereg.h b/src/pulsecore/namereg.h
index 467db5d43..eb3475ad3 100644
--- a/src/pulsecore/namereg.h
+++ b/src/pulsecore/namereg.h
@@ -36,12 +36,6 @@ const char *pa_namereg_register(pa_core *c, const char *name, pa_namereg_type_t
 void pa_namereg_unregister(pa_core *c, const char *name);
 void* pa_namereg_get(pa_core *c, const char *name, pa_namereg_type_t type);
 
-pa_sink* pa_namereg_set_default_sink(pa_core*c, pa_sink *s);
-pa_source* pa_namereg_set_default_source(pa_core*c, pa_source *s);
-
-pa_sink *pa_namereg_get_default_sink(pa_core *c);
-pa_source *pa_namereg_get_default_source(pa_core *c);
-
 bool pa_namereg_is_valid_name(const char *name);
 bool pa_namereg_is_valid_name_or_wildcard(const char *name, pa_namereg_type_t type);
 char* pa_namereg_make_valid_name(const char *name);
diff --git a/src/pulsecore/protocol-native.c b/src/pulsecore/protocol-native.c
index 13f4f6238..8869ae4fa 100644
--- a/src/pulsecore/protocol-native.c
+++ b/src/pulsecore/protocol-native.c
@@ -3637,10 +3637,9 @@ static void command_get_info_list(pa_pdispatch *pd, uint32_t command, uint32_t t
 static void command_get_server_info(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
     pa_native_connection *c = PA_NATIVE_CONNECTION(userdata);
     pa_tagstruct *reply;
-    pa_sink *def_sink;
-    pa_source *def_source;
     pa_sample_spec fixed_ss;
     char *h, *u;
+    pa_core *core;
 
     pa_native_connection_assert_ref(c);
     pa_assert(t);
@@ -3664,18 +3663,18 @@ static void command_get_server_info(pa_pdispatch *pd, uint32_t command, uint32_t
     pa_tagstruct_puts(reply, h);
     pa_xfree(h);
 
-    fixup_sample_spec(c, &fixed_ss, &c->protocol->core->default_sample_spec);
+    core = c->protocol->core;
+
+    fixup_sample_spec(c, &fixed_ss, &core->default_sample_spec);
     pa_tagstruct_put_sample_spec(reply, &fixed_ss);
 
-    def_sink = pa_namereg_get_default_sink(c->protocol->core);
-    pa_tagstruct_puts(reply, def_sink ? def_sink->name : NULL);
-    def_source = pa_namereg_get_default_source(c->protocol->core);
-    pa_tagstruct_puts(reply, def_source ? def_source->name : NULL);
+    pa_tagstruct_puts(reply, core->default_sink ? core->default_sink->name : NULL);
+    pa_tagstruct_puts(reply, core->default_source ? core->default_source->name : NULL);
 
     pa_tagstruct_putu32(reply, c->protocol->core->cookie);
 
     if (c->version >= 15)
-        pa_tagstruct_put_channel_map(reply, &c->protocol->core->default_channel_map);
+        pa_tagstruct_put_channel_map(reply, &core->default_channel_map);
 
     pa_pstream_send_tagstruct(c->pstream, reply);
 }
@@ -4347,7 +4346,7 @@ static void command_set_default_sink_or_source(pa_pdispatch *pd, uint32_t comman
         source = pa_namereg_get(c->protocol->core, s, PA_NAMEREG_SOURCE);
         CHECK_VALIDITY(c->pstream, source, tag, PA_ERR_NOENTITY);
 
-        pa_namereg_set_default_source(c->protocol->core, source);
+        pa_core_set_configured_default_source(c->protocol->core, source);
     } else {
         pa_sink *sink;
         pa_assert(command == PA_COMMAND_SET_DEFAULT_SINK);
@@ -4355,7 +4354,7 @@ static void command_set_default_sink_or_source(pa_pdispatch *pd, uint32_t comman
         sink = pa_namereg_get(c->protocol->core, s, PA_NAMEREG_SINK);
         CHECK_VALIDITY(c->pstream, sink, tag, PA_ERR_NOENTITY);
 
-        pa_namereg_set_default_sink(c->protocol->core, sink);
+        pa_core_set_configured_default_sink(c->protocol->core, sink);
     }
 
     pa_pstream_send_simple_ack(c->pstream, tag);
diff --git a/src/pulsecore/sink.c b/src/pulsecore/sink.c
index 6011f45bc..f18fdb9a0 100644
--- a/src/pulsecore/sink.c
+++ b/src/pulsecore/sink.c
@@ -660,6 +660,8 @@ void pa_sink_put(pa_sink* s) {
 
     pa_source_put(s->monitor_source);
 
+    pa_core_update_default_sink(s->core);
+
     pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK | PA_SUBSCRIPTION_EVENT_NEW, s->index);
     pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_PUT], s);
 }
@@ -690,6 +692,11 @@ void pa_sink_unlink(pa_sink* s) {
         pa_namereg_unregister(s->core, s->name);
     pa_idxset_remove_by_data(s->core->sinks, s, NULL);
 
+    if (s == s->core->configured_default_sink)
+        pa_core_set_configured_default_sink(s->core, NULL);
+    else
+        pa_core_update_default_sink(s->core);
+
     if (s->card)
         pa_idxset_remove_by_data(s->card->sinks, s, NULL);
 
diff --git a/src/pulsecore/source.c b/src/pulsecore/source.c
index 09c953f12..6735e8302 100644
--- a/src/pulsecore/source.c
+++ b/src/pulsecore/source.c
@@ -603,6 +603,8 @@ void pa_source_put(pa_source *s) {
     else
         pa_assert_se(source_set_state(s, PA_SOURCE_IDLE) == 0);
 
+    pa_core_update_default_source(s->core);
+
     pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SOURCE | PA_SUBSCRIPTION_EVENT_NEW, s->index);
     pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SOURCE_PUT], s);
 }
@@ -632,6 +634,11 @@ void pa_source_unlink(pa_source *s) {
         pa_namereg_unregister(s->core, s->name);
     pa_idxset_remove_by_data(s->core->sources, s, NULL);
 
+    if (s == s->core->configured_default_source)
+        pa_core_set_configured_default_source(s->core, NULL);
+    else
+        pa_core_update_default_source(s->core);
+
     if (s->card)
         pa_idxset_remove_by_data(s->card->sources, s, NULL);
 
-- 
2.11.0



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