audiomixer: port to wireplumber 0.4koi_11.0.2koi/11.0.211.0.2

* use module-mixer-api and module-default-nodes-api
* use endpoints without endpoint streams (new design)
* improve thread safety a little bit

Bug-AGL: SPEC-3844
Signed-off-by: George Kiagiadakis <george.kiagiadakis@collabora.com>
Change-Id: Ia180d607698d7a8875c19cc48bd2b2c503772945

1 files changed, 226 insertions, 256 deletions

diff --git a/binding/audiomixer.c b/binding/audiomixer.c
index aceaefe..78dd347 100644
--- a/binding/audiomixer.c
+++ b/binding/audiomixer.c
@@ -18,13 +18,12 @@ struct audiomixer
 	GMutex lock;
 	GCond cond;
 
-	WpRemoteState state;
 	GPtrArray *mixer_controls;
-	GWeakRef session;
 
-	/* ref held in the thread function */
-	WpObjectManager *sessions_om;
-	WpObjectManager *endpoints_om;
+	gint initialized;
+	WpObjectManager *om;
+	WpPlugin *default_nodes_api;
+	WpPlugin *mixer_api;
 
 	const struct audiomixer_events *events;
 	void *events_data;
@@ -33,9 +32,7 @@ struct audiomixer
 struct mixer_control_impl
 {
 	struct mixer_control pub;
-	gboolean is_master;
-	guint32 id;
-	WpEndpoint *endpoint;
+	guint32 node_id;
 };
 
 struct action
@@ -53,35 +50,67 @@ struct action
 	};
 };
 
+static gboolean
+get_mixer_controls (struct audiomixer * self, guint32 node_id, gdouble * vol, gboolean * mute)
+{
+	g_autoptr (GVariant) v = NULL;
+	g_signal_emit_by_name (self->mixer_api, "get-volume", node_id, &v);
+	return v &&
+		g_variant_lookup (v, "volume", "d", &vol, NULL) &&
+		g_variant_lookup (v, "mute", "b", &mute, NULL);
+}
+
+static void
+add_control (struct audiomixer *self, const char *name, guint32 node_id)
+{
+	struct mixer_control_impl *mixctl = NULL;
+	gdouble volume = 1.0;
+	gboolean mute = FALSE;
+
+	/* get current values */
+	if (!get_mixer_controls (self, node_id, &volume, &mute)) {
+		g_warning ("failed to get object controls when populating controls");
+		return;
+	}
+
+	/* create the control */
+	mixctl = g_new0 (struct mixer_control_impl, 1);
+	snprintf (mixctl->pub.name, sizeof (mixctl->pub.name), "%s", name);
+	mixctl->pub.volume = volume;
+	mixctl->pub.mute = mute;
+	mixctl->node_id = node_id;
+	g_ptr_array_add (self->mixer_controls, mixctl);
+
+	g_debug ("added control %s", mixctl->pub.name);
+}
+
 static void
-control_changed (WpEndpoint * ep, guint32 control_id, struct audiomixer * self)
+volume_changed (struct audiomixer * self, guint32 node_id)
 {
-	struct mixer_control_impl *ctl;
+	g_autoptr (GMutexLocker) locker = g_mutex_locker_new (&self->lock);
+	gdouble vol = 1.0;
+	gboolean mute = FALSE;
 
 	for (guint i = 0; i < self->mixer_controls->len; i++) {
+		struct mixer_control_impl *ctl;
+		guint change_mask = 0;
+
 		ctl = g_ptr_array_index (self->mixer_controls, i);
-		if (ctl->endpoint != ep)
+		if (ctl->node_id != node_id)
 			continue;
 
-		guint change_mask = 0;
+		if (!get_mixer_controls (self, node_id, &vol, &mute)) {
+			g_warning ("failed to get object controls when volume changed");
+			return;
+		}
 
-		switch (control_id) {
-		case WP_ENDPOINT_CONTROL_VOLUME: {
-			float vol;
-			wp_endpoint_get_control_float (ep, control_id, &vol);
+		if ((ctl->pub.volume - 0.01f) > vol || (ctl->pub.volume + 0.01f) < vol) {
 			ctl->pub.volume = vol;
-			change_mask = MIXER_CONTROL_CHANGE_FLAG_VOLUME;
-			break;
+			change_mask |= MIXER_CONTROL_CHANGE_FLAG_VOLUME;
 		}
-		case WP_ENDPOINT_CONTROL_MUTE: {
-			gboolean mute;
-			wp_endpoint_get_control_boolean (ep, control_id, &mute);
+		if (ctl->pub.mute != mute) {
 			ctl->pub.mute = mute;
-			change_mask = MIXER_CONTROL_CHANGE_FLAG_MUTE;
-			break;
-		}
-		default:
-			break;
+			change_mask |= MIXER_CONTROL_CHANGE_FLAG_MUTE;
 		}
 
 		if (self->events && self->events->value_changed)
@@ -90,239 +119,190 @@ control_changed (WpEndpoint * ep, guint32 control_id, struct audiomixer * self)
 	}
 }
 
-/* called with self->lock locked */
 static void
-check_and_populate_controls (struct audiomixer * self)
+rescan_controls (struct audiomixer * self)
 {
-	g_autoptr (WpSession) session = NULL;
-	g_autoptr (WpEndpoint) def_ep = NULL;
-	guint32 def_id = 0;
-	struct mixer_control_impl *master_ctl = NULL;
-
-	/* find the session */
-	session = g_weak_ref_get (&self->session);
-
-	/* find the default audio sink endpoint */
-	if (session) {
-		g_autoptr (GPtrArray) arr =
-				wp_object_manager_get_objects (self->endpoints_om, 0);
-		def_id = wp_session_get_default_endpoint (session,
-				WP_DEFAULT_ENDPOINT_TYPE_AUDIO_SINK);
-
-		for (guint i = 0; i < arr->len; i++) {
-			WpEndpoint *ep = g_ptr_array_index (arr, i);
-			guint32 id = wp_proxy_get_global_id (WP_PROXY (ep));
-			if (id != def_id)
-				continue;
-			def_ep = g_object_ref (ep);
-		}
+	g_autoptr (GMutexLocker) locker = g_mutex_locker_new (&self->lock);
+	g_autoptr (WpIterator) it = NULL;
+	g_auto (GValue) val = G_VALUE_INIT;
+	guint32 id = -1;
+
+	g_debug ("rescan");
+
+	/* clear previous */
+	g_ptr_array_set_size (self->mixer_controls, 0);
+
+	/* add master controls */
+	g_signal_emit_by_name (self->default_nodes_api, "get-default-node",
+			"Audio/Sink", &id);
+	if (id != (guint32)-1)
+		add_control (self, "Master Playback", id);
+
+	g_signal_emit_by_name (self->default_nodes_api, "get-default-node",
+			"Audio/Source", &id);
+	if (id != (guint32)-1)
+		add_control (self, "Master Capture", id);
+
+	/* add endpoints */
+	it = wp_object_manager_new_iterator (self->om);
+	for (; wp_iterator_next (it, &val); g_value_unset (&val)) {
+		WpPipewireObject *ep = g_value_get_object (&val);
+		const gchar *name = wp_pipewire_object_get_property (ep, "endpoint.description");
+		const gchar *node = wp_pipewire_object_get_property (ep, "node.id");
+		id = node ? atoi(node) : 0;
+		if (name && id != 0 && id != (guint32)-1)
+			add_control (self, name, id);
 	}
 
-	/* find the audio sink endpoint that was the default before */
-	for (guint i = 0; i < self->mixer_controls->len; i++) {
-		struct mixer_control_impl *ctl = (struct mixer_control_impl *)
-				g_ptr_array_index (self->mixer_controls, i);
-		if (ctl->is_master) {
-			master_ctl = ctl;
-			break;
-		}
-	}
+	/* notify subscribers */
+	if (self->events && self->events->controls_changed)
+		self->events->controls_changed (self->events_data);
+	g_cond_broadcast (&self->cond);
+}
 
-	g_debug ("check_and_populate: session:%p, def_ep:%p, def_id:%u, "
-			"master_ctl:%p, master_id:%u", session, def_ep, def_id,
-			master_ctl, master_ctl ? master_ctl->id : 0);
-
-	/* case 1: there is a default endpoint but it doesn't match
-	           what we currently expose -> clear and expose the new one */
-	if (def_ep && (!master_ctl || master_ctl->id != def_id)) {
-		struct mixer_control_impl *mixctl = NULL;
-		gfloat volume;
-		gboolean mute;
-
-		/* clear previous */
-		if (master_ctl)
-			g_signal_handlers_disconnect_by_data (master_ctl->endpoint, self);
-		g_ptr_array_set_size (self->mixer_controls, 0);
-
-		/* get current master values */
-		wp_endpoint_get_control_float (def_ep, WP_ENDPOINT_CONTROL_VOLUME, &volume);
-		wp_endpoint_get_control_boolean (def_ep, WP_ENDPOINT_CONTROL_MUTE, &mute);
-
-		/* create the Master control */
-		mixctl = g_new0 (struct mixer_control_impl, 1);
-		strncpy (mixctl->pub.name, "Master", sizeof (mixctl->pub.name));
-		mixctl->pub.volume = volume;
-		mixctl->pub.mute = mute;
-		mixctl->is_master = TRUE;
-		mixctl->id = def_id;
-		mixctl->endpoint = g_object_ref (def_ep);
-		g_ptr_array_add (self->mixer_controls, mixctl);
-
-		/* track changes */
-		g_signal_connect (def_ep, "control-changed", (GCallback) control_changed,
-			self);
-
-		/* wake up audiomixer_ensure_controls() */
-		g_cond_broadcast (&self->cond);
-
-		g_debug ("controls changed");
-
-		/* notify subscribers */
-		if (self->events && self->events->controls_changed)
-			self->events->controls_changed (self->events_data);
+static void
+on_default_nodes_activated (WpObject * p, GAsyncResult * res, struct audiomixer * self)
+{
+	g_autoptr (GError) error = NULL;
+	if (!wp_object_activate_finish (p, res, &error)) {
+		g_warning ("%s", error->message);
 	}
-	/* case 2: there is no default endpoint but something is exposed -> clear */
-	else if (!def_ep && master_ctl) {
-		g_signal_handlers_disconnect_by_data (master_ctl->endpoint, self);
-		g_ptr_array_set_size (self->mixer_controls, 0);
 
-		g_debug ("controls cleared");
+	if (wp_object_get_active_features (WP_OBJECT (self->mixer_api))
+			& WP_PLUGIN_FEATURE_ENABLED)
+		wp_core_install_object_manager (self->core, self->om);
 
-		/* notify subscribers */
-		if (self->events && self->events->controls_changed)
-			self->events->controls_changed (self->events_data);
-	}
+	g_signal_connect_swapped (self->default_nodes_api, "changed",
+		(GCallback) rescan_controls, self);
 }
 
 static void
-default_endpoint_changed (WpSession * session, WpDefaultEndpointType type,
-		guint32 new_id, struct audiomixer * self)
+on_mixer_activated (WpObject * p, GAsyncResult * res, struct audiomixer * self)
 {
-	if (type != WP_DEFAULT_ENDPOINT_TYPE_AUDIO_SINK)
-		return;
+	g_autoptr (GError) error = NULL;
+	if (!wp_object_activate_finish (p, res, &error)) {
+		g_warning ("%s", error->message);
+	}
 
-	g_autoptr (GMutexLocker) locker = g_mutex_locker_new (&self->lock);
-	check_and_populate_controls (self);
+	if (wp_object_get_active_features (WP_OBJECT (self->default_nodes_api))
+			& WP_PLUGIN_FEATURE_ENABLED)
+		wp_core_install_object_manager (self->core, self->om);
+
+	g_signal_connect_swapped (self->mixer_api, "changed",
+		(GCallback) volume_changed, self);
 }
 
 static void
-sessions_changed (WpObjectManager * sessions_om, struct audiomixer * self)
+on_core_connected (struct audiomixer * self)
 {
-	g_autoptr (GMutexLocker) locker = g_mutex_locker_new (&self->lock);
-	g_autoptr (WpSession) old_session = NULL;
-	g_autoptr (WpSession) session = NULL;
-	g_autoptr (GPtrArray) arr = NULL;
-
-	old_session = g_weak_ref_get (&self->session);
-
-	/* normally there is only 1 session */
-	arr = wp_object_manager_get_objects (sessions_om, 0);
-	if (arr->len > 0)
-		session = WP_SESSION (g_object_ref (g_ptr_array_index (arr, 0)));
-
-	g_debug ("sessions changed, count:%d, session:%p, old_session:%p",
-			arr->len, session, old_session);
-
-	if (session != old_session) {
-		if (old_session)
-			g_signal_handlers_disconnect_by_data (old_session, self);
-		if (session)
-			g_signal_connect (session, "default-endpoint-changed",
-				(GCallback) default_endpoint_changed, self);
-
-		g_weak_ref_set (&self->session, session);
-	}
-
-	check_and_populate_controls (self);
+	self->om = wp_object_manager_new ();
+	wp_object_manager_add_interest (self->om, WP_TYPE_ENDPOINT,
+		WP_CONSTRAINT_TYPE_PW_GLOBAL_PROPERTY,
+		PW_KEY_MEDIA_CLASS, "#s", "Audio/*", NULL);
+	wp_object_manager_request_object_features (self->om,
+		WP_TYPE_ENDPOINT, WP_OBJECT_FEATURES_ALL);
+	g_signal_connect_swapped (self->om, "objects-changed",
+		(GCallback) rescan_controls, self);
+
+	wp_object_activate (WP_OBJECT (self->default_nodes_api),
+		WP_PLUGIN_FEATURE_ENABLED, NULL,
+		(GAsyncReadyCallback) on_default_nodes_activated, self);
+
+	wp_object_activate (WP_OBJECT (self->mixer_api),
+		WP_PLUGIN_FEATURE_ENABLED, NULL,
+		(GAsyncReadyCallback) on_mixer_activated, self);
 }
 
 static void
-endpoints_changed (WpObjectManager * endpoints_om, struct audiomixer * self)
+on_core_disconnected (struct audiomixer * self)
 {
-	g_autoptr (GMutexLocker) locker = g_mutex_locker_new (&self->lock);
-	check_and_populate_controls (self);
+	g_ptr_array_set_size (self->mixer_controls, 0);
+	g_clear_object (&self->om);
+	g_signal_handlers_disconnect_by_data (self->default_nodes_api, self);
+	g_signal_handlers_disconnect_by_data (self->mixer_api, self);
+	wp_object_deactivate (WP_OBJECT (self->default_nodes_api), WP_PLUGIN_FEATURE_ENABLED);
+	wp_object_deactivate (WP_OBJECT (self->mixer_api), WP_PLUGIN_FEATURE_ENABLED);
 }
 
 static void
-remote_state_changed (WpCore *core, WpRemoteState state,
-	struct audiomixer * self)
+audiomixer_init_in_thread (struct audiomixer * self)
 {
 	g_autoptr (GMutexLocker) locker = g_mutex_locker_new (&self->lock);
-	self->state = state;
-	g_cond_broadcast (&self->cond);
-}
+	g_autoptr (GError) error = NULL;
 
-static gboolean
-connect_in_idle (struct audiomixer * self)
-{
-	wp_core_connect (self->core);
-	return G_SOURCE_REMOVE;
+	self->context = g_main_context_new ();
+	g_main_context_push_thread_default (self->context);
+
+	self->loop = g_main_loop_new (self->context, FALSE);
+	self->core = wp_core_new (self->context, NULL);
+
+	/* load required API modules */
+	if (!wp_core_load_component (self->core,
+			"libwireplumber-module-default-nodes-api", "module", NULL, &error)) {
+		g_warning ("%s", error->message);
+		self->initialized = -1;
+		goto out;
+	}
+	if (!wp_core_load_component (self->core,
+			"libwireplumber-module-mixer-api", "module", NULL, &error)) {
+		g_warning ("%s", error->message);
+		self->initialized = -1;
+		goto out;
+	}
+
+	self->default_nodes_api = wp_plugin_find (self->core, "default-nodes-api");
+	self->mixer_api = wp_plugin_find (self->core, "mixer-api");
+	g_object_set (G_OBJECT (self->mixer_api), "scale", 1 /* cubic */, NULL);
+
+	g_signal_connect_swapped (self->core, "connected",
+		G_CALLBACK (on_core_connected), self);
+	g_signal_connect_swapped (self->core, "disconnected",
+		G_CALLBACK (on_core_disconnected), self);
+
+	self->initialized = 1;
+
+out:
+	g_cond_broadcast (&self->cond);
 }
 
 static void *
 audiomixer_thread (struct audiomixer * self)
 {
-	g_autoptr (WpObjectManager) sessions_om =
-			self->sessions_om = wp_object_manager_new ();
-	g_autoptr (WpObjectManager) endpoints_om =
-			self->endpoints_om = wp_object_manager_new ();
-	GVariantBuilder b;
+	audiomixer_init_in_thread (self);
 
-	g_main_context_push_thread_default (self->context);
+	/* main loop for the thread; quits only when audiomixer_free() is called */
+	g_main_loop_run (self->loop);
 
-	/* install object manager for sessions */
-	wp_object_manager_add_proxy_interest (sessions_om, PW_TYPE_INTERFACE_Session,
-		NULL, WP_PROXY_FEATURE_INFO | WP_PROXY_SESSION_FEATURE_DEFAULT_ENDPOINT);
-	g_signal_connect (sessions_om, "objects-changed",
-		(GCallback) sessions_changed, self);
-	wp_core_install_object_manager (self->core, sessions_om);
-
-	/* install object manager for Audio/Sink endpoints */
-	g_variant_builder_init (&b, G_VARIANT_TYPE ("aa{sv}"));
-	g_variant_builder_open (&b, G_VARIANT_TYPE_VARDICT);
-	g_variant_builder_add (&b, "{sv}", "type",
-		g_variant_new_int32 (WP_OBJECT_MANAGER_CONSTRAINT_PW_GLOBAL_PROPERTY));
-	g_variant_builder_add (&b, "{sv}", "name",
-		g_variant_new_string (PW_KEY_MEDIA_CLASS));
-	g_variant_builder_add (&b, "{sv}", "value",
-		g_variant_new_string ("Audio/Sink"));
-	g_variant_builder_close (&b);
-
-	wp_object_manager_add_proxy_interest (endpoints_om,
-		PW_TYPE_INTERFACE_Endpoint,
-		g_variant_builder_end (&b),
-		WP_PROXY_FEATURE_INFO | WP_PROXY_ENDPOINT_FEATURE_CONTROLS);
-	g_signal_connect (endpoints_om, "objects-changed",
-		(GCallback) endpoints_changed, self);
-	wp_core_install_object_manager (self->core, endpoints_om);
-
-	g_signal_connect (self->core, "remote-state-changed",
-		(GCallback) remote_state_changed, self);
+	wp_core_disconnect (self->core);
+	g_clear_object (&self->default_nodes_api);
+	g_clear_object (&self->mixer_api);
+	g_object_unref (self->core);
 
-	g_main_loop_run (self->loop);
 	g_main_context_pop_thread_default (self->context);
+	g_main_loop_unref (self->loop);
+	g_main_context_unref (self->context);
 
 	return NULL;
 }
 
-static void
-mixer_control_impl_free (struct mixer_control_impl * impl)
-{
-	if (impl->endpoint)
-		g_signal_handlers_disconnect_matched (impl->endpoint,
-			G_SIGNAL_MATCH_FUNC, 0, 0, NULL, control_changed, NULL);
-	g_clear_object (&impl->endpoint);
-	g_free (impl);
-}
-
 struct audiomixer *
 audiomixer_new (void)
 {
 	struct audiomixer *self = calloc(1, sizeof(struct audiomixer));
 
+	wp_init (WP_INIT_ALL);
+
 	g_mutex_init (&self->lock);
 	g_cond_init (&self->cond);
-	self->context = g_main_context_new ();
-	self->loop = g_main_loop_new (self->context, FALSE);
-	self->core = wp_core_new (self->context, NULL);
-
-	self->state = WP_REMOTE_STATE_UNCONNECTED;
-	self->mixer_controls = g_ptr_array_new_with_free_func (
-		(GDestroyNotify) mixer_control_impl_free);
-	g_weak_ref_init (&self->session, NULL);
+	self->mixer_controls = g_ptr_array_new_with_free_func (g_free);
 
+	g_mutex_lock (&self->lock);
+	self->initialized = 0;
 	self->thread = g_thread_new ("audiomixer", (GThreadFunc) audiomixer_thread,
 		self);
+	while (self->initialized == 0)
+		g_cond_wait (&self->cond, &self->lock);
+	g_mutex_unlock (&self->lock);
 
 	return self;
 }
@@ -333,11 +313,7 @@ audiomixer_free(struct audiomixer *self)
 	g_main_loop_quit (self->loop);
 	g_thread_join (self->thread);
 
-	g_weak_ref_clear (&self->session);
 	g_ptr_array_unref (self->mixer_controls);
-	g_object_unref (self->core);
-	g_main_loop_unref (self->loop);
-	g_main_context_unref (self->context);
 	g_cond_clear (&self->cond);
 	g_mutex_clear (&self->lock);
 
@@ -356,34 +332,24 @@ audiomixer_unlock(struct audiomixer *self)
 	g_mutex_unlock (&self->lock);
 }
 
-int
-audiomixer_ensure_connected(struct audiomixer *self, int timeout_sec)
+static gboolean
+do_connect (WpCore * core)
 {
-	gint64 end_time = g_get_monotonic_time () + timeout_sec * G_TIME_SPAN_SECOND;
-
-	/* already connected */
-	if (self->state == WP_REMOTE_STATE_CONNECTED)
-		return 0;
-
-	/* if disconnected, for any reason, try to connect again */
-	if (self->state != WP_REMOTE_STATE_CONNECTING)
-		wp_core_idle_add (self->core, (GSourceFunc) connect_in_idle, self, NULL);
-
-	while (true) {
-		if (!g_cond_wait_until (&self->cond, &self->lock, end_time))
-			return -ETIMEDOUT;
-
-		if (self->state == WP_REMOTE_STATE_CONNECTED)
-			return 0;
-		else if (self->state == WP_REMOTE_STATE_ERROR)
-			return -EIO;
-	}
+	if (!wp_core_connect (core))
+		g_warning ("Failed to connect to PipeWire");
+	return G_SOURCE_REMOVE;
 }
 
 int
 audiomixer_ensure_controls(struct audiomixer *self, int timeout_sec)
 {
 	gint64 end_time = g_get_monotonic_time () + timeout_sec * G_TIME_SPAN_SECOND;
+
+	g_return_val_if_fail (self->initialized == 1, -EIO);
+
+	if (!wp_core_is_connected (self->core))
+		g_main_context_invoke (self->context, (GSourceFunc) do_connect, self->core);
+
 	while (self->mixer_controls->len == 0) {
 		if (!g_cond_wait_until (&self->cond, &self->lock, end_time))
 			return -ETIMEDOUT;
@@ -425,17 +391,17 @@ audiomixer_add_event_listener(struct audiomixer *self,
 static gboolean
 do_change_volume (struct action * action)
 {
-	struct mixer_control_impl *ctl;
 	struct audiomixer *self = action->audiomixer;
+	GVariantBuilder b = G_VARIANT_BUILDER_INIT (G_VARIANT_TYPE_VARDICT);
+	gboolean ret = FALSE;
+
+	g_variant_builder_add (&b, "{sv}", "volume",
+		g_variant_new_double (action->change_volume.volume));
+	g_signal_emit_by_name (self->mixer_api, "set-volume",
+		action->change_volume.id, g_variant_builder_end (&b), &ret);
+	if (!ret)
+		g_warning ("mixer api set-volume failed");
 
-	for (guint i = 0; i < self->mixer_controls->len; i++) {
-		ctl = g_ptr_array_index (self->mixer_controls, i);
-		if (ctl->id != action->change_volume.id)
-			continue;
-		if (ctl->is_master)
-			wp_endpoint_set_control_float (ctl->endpoint,
-				WP_ENDPOINT_CONTROL_VOLUME, action->change_volume.volume);
-	}
 	return G_SOURCE_REMOVE;
 }
 
@@ -448,29 +414,31 @@ audiomixer_change_volume(struct audiomixer *self,
 		(const struct mixer_control_impl *) control;
 	struct action * action;
 
+	g_return_if_fail (self->initialized == 1);
+
 	/* schedule the action to run on the audiomixer thread */
 	action = g_new0 (struct action, 1);
 	action->audiomixer = self;
-	action->change_volume.id = impl->id;
+	action->change_volume.id = impl->node_id;
 	action->change_volume.volume = (gfloat) volume;
-	wp_core_idle_add (self->core, (GSourceFunc) do_change_volume, action,
+	wp_core_idle_add (self->core, NULL, (GSourceFunc) do_change_volume, action,
 		g_free);
 }
 
 static gboolean
 do_change_mute (struct action * action)
 {
-	struct mixer_control_impl *ctl;
 	struct audiomixer *self = action->audiomixer;
+	GVariantBuilder b = G_VARIANT_BUILDER_INIT (G_VARIANT_TYPE_VARDICT);
+	gboolean ret = FALSE;
+
+	g_variant_builder_add (&b, "{sv}", "mute",
+		g_variant_new_double (action->change_mute.mute));
+	g_signal_emit_by_name (self->mixer_api, "set-volume",
+		action->change_mute.id, g_variant_builder_end (&b), &ret);
+	if (!ret)
+		g_warning ("mixer api set-volume failed");
 
-	for (guint i = 0; i < self->mixer_controls->len; i++) {
-		ctl = g_ptr_array_index (self->mixer_controls, i);
-		if (ctl->id != action->change_mute.id)
-			continue;
-		if (ctl->is_master)
-			wp_endpoint_set_control_boolean (ctl->endpoint,
-				WP_ENDPOINT_CONTROL_MUTE, action->change_mute.mute);
-	}
 	return G_SOURCE_REMOVE;
 }
 
@@ -483,11 +451,13 @@ audiomixer_change_mute(struct audiomixer *self,
 		(const struct mixer_control_impl *) control;
 	struct action * action;
 
+	g_return_if_fail (self->initialized == 1);
+
 	/* schedule the action to run on the audiomixer thread */
 	action = g_new0 (struct action, 1);
 	action->audiomixer = self;
-	action->change_mute.id = impl->id;
+	action->change_mute.id = impl->node_id;
 	action->change_mute.mute = mute;
-	wp_core_idle_add (self->core, (GSourceFunc) do_change_mute, action,
+	wp_core_idle_add (self->core, NULL, (GSourceFunc) do_change_mute, action,
 		g_free);
 }