module-protocol-pulse: Add Avahi zeroconf publish module

src/modules/meson.build

@@ -131,8 +131,8 @@ if dbus_dep.found()
   pipewire_module_protocol_pulse_deps += dbus_dep
 endif
 
-pipewire_module_protocol_pulse = shared_library('pipewire-module-protocol-pulse',
-  [ 'module-protocol-pulse.c',
+pipewire_module_protocol_pulse_sources = [
+  'module-protocol-pulse.c',
   'module-protocol-pulse/manager.c',
   'module-protocol-pulse/pulse-server.c',
   'module-protocol-pulse/modules/module-combine-sink.c',
@@ -149,7 +149,19 @@ pipewire_module_protocol_pulse = shared_library('pipewire-module-protocol-pulse'
   'module-protocol-pulse/modules/module-tunnel-sink.c',
   'module-protocol-pulse/modules/module-tunnel-source.c',
   'module-protocol-pulse/modules/module-zeroconf-discover.c',
-  ],
+]
+
+if avahi_dep.found()
+  pipewire_module_protocol_pulse_sources += [
+    'module-protocol-pulse/modules/module-zeroconf-publish.c',
+    'module-zeroconf-discover/avahi-poll.c',
+  ]
+  pipewire_module_protocol_pulse_deps += avahi_dep
+  cdata.set('HAVE_AVAHI', 1)
+endif
+
+pipewire_module_protocol_pulse = shared_library('pipewire-module-protocol-pulse',
+  pipewire_module_protocol_pulse_sources,
   include_directories : [configinc, spa_inc],
   install : true,
   install_dir : modules_install_dir,

src/modules/module-protocol-pulse/module.c

@@ -232,6 +232,9 @@ static const struct module_info module_list[] = {
 	{ "module-tunnel-sink", create_module_tunnel_sink, },
 	{ "module-tunnel-source", create_module_tunnel_source, },
 	{ "module-zeroconf-discover", create_module_zeroconf_discover, },
+#ifdef HAVE_AVAHI
+	{ "module-zeroconf-publish", create_module_zeroconf_publish, },
+#endif
 	{ NULL, }
 };
 

src/modules/module-protocol-pulse/modules/module-zeroconf-publish.c

@@ -0,0 +1,687 @@
+/* PipeWire
+ *
+ * Copyright © 2021 Wim Taymans <wim.taymans@gmail.com>
+ * Copyright © 2021 Sanchayan Maity <sanchayan@asymptotic.io>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <pipewire/pipewire.h>
+
+#include "../collect.h"
+#include "../defs.h"
+#include "../manager.h"
+#include "../module.h"
+#include "../pulse-server.h"
+#include "registry.h"
+#include "sys/utsname.h"
+
+#include "../../module-zeroconf-discover/avahi-poll.h"
+#include <avahi-client/client.h>
+#include <avahi-client/publish.h>
+#include <avahi-common/alternative.h>
+#include <avahi-common/error.h>
+#include <avahi-common/domain.h>
+
+#define SERVICE_TYPE_SINK "_pulse-sink._tcp"
+#define SERVICE_TYPE_SOURCE "_pulse-source._tcp"
+#define SERVICE_TYPE_SERVER "_pulse-server._tcp"
+#define SERVICE_SUBTYPE_SINK_HARDWARE "_hardware._sub."SERVICE_TYPE_SINK
+#define SERVICE_SUBTYPE_SINK_VIRTUAL "_virtual._sub."SERVICE_TYPE_SINK
+#define SERVICE_SUBTYPE_SOURCE_HARDWARE "_hardware._sub."SERVICE_TYPE_SOURCE
+#define SERVICE_SUBTYPE_SOURCE_VIRTUAL "_virtual._sub."SERVICE_TYPE_SOURCE
+#define SERVICE_SUBTYPE_SOURCE_MONITOR "_monitor._sub."SERVICE_TYPE_SOURCE
+#define SERVICE_SUBTYPE_SOURCE_NON_MONITOR "_non-monitor._sub."SERVICE_TYPE_SOURCE
+
+enum service_subtype {
+	SUBTYPE_HARDWARE,
+	SUBTYPE_VIRTUAL,
+	SUBTYPE_MONITOR
+};
+
+struct service {
+	void *key;
+
+	struct module_zeroconf_publish_data *userdata;
+	AvahiEntryGroup *entry_group;
+	char *service_name;
+	const char *service_type;
+	enum service_subtype subtype;
+
+	char *name;
+	bool is_sink;
+
+	struct sample_spec ss;
+	struct channel_map cm;
+	struct pw_properties *props;
+};
+
+struct module_zeroconf_publish_data {
+	struct module *module;
+
+	struct pw_core *core;
+	struct pw_manager *manager;
+
+	struct spa_hook core_listener;
+	struct spa_hook manager_listener;
+
+	unsigned int port;
+
+	AvahiPoll *avahi_poll;
+	AvahiClient *client;
+	bool entry_group_free;
+};
+
+static void on_core_error(void *data, uint32_t id, int seq, int res, const char *message)
+{
+	struct module_zeroconf_publish_data *d = data;
+	struct module *module = d->module;
+
+	pw_log_error("error id:%u seq:%d res:%d (%s): %s",
+			id, seq, res, spa_strerror(res), message);
+
+	if (id == PW_ID_CORE && res == -EPIPE)
+		module_schedule_unload(module);
+}
+
+static const struct pw_core_events core_events = {
+	PW_VERSION_CORE_EVENTS,
+	.error = on_core_error,
+};
+
+static char *get_service_name(struct pw_manager_object *o)
+{
+	const char *hn, *un, *n;
+	char *service_name;
+
+	hn = pw_get_host_name();
+	un = pw_get_user_name();
+	n = pw_properties_get(o->props, PW_KEY_NODE_DESCRIPTION);
+
+	service_name = calloc(1, AVAHI_LABEL_MAX - 1);
+	snprintf(service_name, AVAHI_LABEL_MAX - 1, "%s@%s: %s", un, hn, n);
+
+	return service_name;
+}
+
+static int service_free(void *d, struct pw_manager_object *o) {
+	struct service *s;
+	char *service_name;
+
+	if (!pw_manager_object_is_sink(o) && !pw_manager_object_is_source(o))
+		return 0;
+
+	service_name = get_service_name(o);
+
+	s = pw_manager_object_add_data(o, service_name, sizeof(struct service));
+	if (s == NULL) {
+		pw_log_error("Could not find service %s to remove", service_name);
+		free(service_name);
+		return 0;
+	}
+	free(service_name);
+	spa_assert(s);
+
+	if (s->entry_group) {
+		pw_log_debug("Removing entry group for %s.", s->service_name);
+		avahi_entry_group_free(s->entry_group);
+	}
+
+	if (s->service_name) {
+		pw_log_debug("Removing service: %s", s->service_name);
+		free(s->service_name);
+	}
+
+	if (s->name) {
+		pw_log_debug("Removing service for node: %s", s->name);
+		free(s->name);
+	}
+
+	if (s->props)
+		pw_properties_free(s->props);
+
+	return 0;
+}
+
+static int unpublish_service(void *data, struct pw_manager_object *o) {
+	struct module_zeroconf_publish_data *d = data;
+	struct service *s;
+	char *service_name;
+
+	if (!pw_manager_object_is_sink(o) && !pw_manager_object_is_source(o))
+		return 0;
+
+	service_name = get_service_name(o);
+
+	s = pw_manager_object_add_data(o, service_name, sizeof(struct service));
+	if (s == NULL) {
+		pw_log_error("Could not find service %s to remove", service_name);
+		free(service_name);
+		return 0;
+	}
+	free(service_name);
+	spa_assert(s);
+
+	if (s->entry_group) {
+		if (d->entry_group_free) {
+			pw_log_debug("Removing entry group for %s.", s->service_name);
+			avahi_entry_group_free(s->entry_group);
+			s->entry_group = NULL;
+		} else {
+			avahi_entry_group_reset(s->entry_group);
+			pw_log_debug("Resetting entry group for %s.", s->service_name);
+		}
+	}
+
+	return 0;
+}
+
+static void unpublish_all_services(struct module_zeroconf_publish_data *d, bool entry_group_free)
+{
+	d->entry_group_free = entry_group_free;
+	pw_manager_for_each_object(d->manager, unpublish_service, d);
+}
+
+static char* channel_map_snprint(char *s, size_t l, const struct channel_map *map)
+{
+	unsigned channel;
+	bool first = true;
+	char *e;
+
+	spa_assert(s);
+	spa_assert(l > 0);
+	spa_assert(map);
+
+	if (!channel_map_valid(map)) {
+		snprintf(s, l, "(invalid)");
+		return s;
+	}
+
+	*(e = s) = 0;
+
+	for (channel = 0; channel < map->channels && l > 1; channel++) {
+		l -= snprintf(e, l, "%s%s",
+				first ? "" : ",",
+				channel_id2name(channel_pa2id(map->map[channel])));
+
+		e = strchr(e, 0);
+		first = false;
+	}
+
+	return s;
+}
+
+static void get_service_data(struct module_zeroconf_publish_data *d,
+		struct service *s, struct pw_manager_object *o)
+{
+	bool is_sink = pw_manager_object_is_sink(o);
+	bool is_source = pw_manager_object_is_source(o);
+	struct pw_node_info *info = o->info;
+	const char *name, *desc, *str;
+	uint32_t card_id = SPA_ID_INVALID;
+	struct pw_manager *manager = d->manager;
+	struct pw_manager_object *card = NULL;
+	struct card_info card_info = CARD_INFO_INIT;
+	struct device_info dev_info = is_sink ?
+		DEVICE_INFO_INIT(PW_DIRECTION_OUTPUT) : DEVICE_INFO_INIT(PW_DIRECTION_INPUT);
+	uint32_t flags = 0;
+
+	if (info == NULL || info->props == NULL)
+		return;
+
+	name = spa_dict_lookup(info->props, PW_KEY_NODE_NAME);
+	if ((desc = spa_dict_lookup(info->props, PW_KEY_NODE_DESCRIPTION)) == NULL)
+		desc = name ? name : "Unknown";
+	if (name == NULL)
+		name = "unknown";
+
+	if ((str = spa_dict_lookup(info->props, PW_KEY_DEVICE_ID)) != NULL)
+		card_id = (uint32_t)atoi(str);
+	if ((str = spa_dict_lookup(info->props, "card.profile.device")) != NULL)
+		dev_info.device = (uint32_t)atoi(str);
+	if (card_id != SPA_ID_INVALID) {
+		struct selector sel = { .id = card_id, .type = pw_manager_object_is_card, };
+		card = select_object(manager, &sel);
+	}
+	if (card)
+		collect_card_info(card, &card_info);
+
+	collect_device_info(o, card, &dev_info, false);
+
+	if ((str = spa_dict_lookup(info->props, PW_KEY_DEVICE_API)) != NULL) {
+		if (pw_manager_object_is_sink(o))
+			flags |= SINK_HARDWARE;
+		else if (pw_manager_object_is_source(o))
+			flags |= SOURCE_HARDWARE;
+	}
+
+	if (is_sink) {
+		s->is_sink = true;
+		s->service_type = SERVICE_TYPE_SINK;
+		s->ss = dev_info.ss;
+		s->cm = dev_info.map;
+		s->name = strdup(name);
+		s->props = pw_properties_copy(o->props);
+		s->subtype = flags & SINK_HARDWARE ? SUBTYPE_HARDWARE : SUBTYPE_VIRTUAL;
+	} else if (is_source) {
+		s->is_sink = false;
+		s->service_type = SERVICE_TYPE_SOURCE;
+		s->name = strdup(name);
+		s->props = pw_properties_copy(o->props);
+		s->subtype = flags & SOURCE_HARDWARE ? SUBTYPE_HARDWARE : SUBTYPE_VIRTUAL;
+	} else
+		spa_assert_not_reached();
+}
+
+static struct service *get_service(struct module_zeroconf_publish_data *d, struct pw_manager_object *o)
+{
+	struct service *s;
+	char *service_name;
+
+	service_name = get_service_name(o);
+
+	s = pw_manager_object_add_data(o, service_name, sizeof(struct service));
+	spa_assert(s);
+
+	s->key = o;
+	s->userdata = d;
+	s->entry_group = NULL;
+	s->service_name = service_name;
+
+	get_service_data(d, s, o);
+
+	return s;
+}
+
+static AvahiStringList* txt_record_server_data(struct pw_core_info *info, AvahiStringList *l)
+{
+	const char *t;
+	struct utsname u;
+	static char sysname[256];
+
+	spa_assert(info);
+	spa_assert(uname(&u) >= 0);
+
+	l = avahi_string_list_add_pair(l, "server-version", PACKAGE_NAME" "PACKAGE_VERSION);
+
+	t = pw_get_user_name();
+	l = avahi_string_list_add_pair(l, "user-name", t);
+
+	snprintf(sysname, sizeof(sysname), "%s %s %s", u.sysname, u.machine, u.release);
+	l = avahi_string_list_add_pair(l, "uname", sysname);
+
+	t = pw_get_host_name();
+	l = avahi_string_list_add_pair(l, "fqdn", t);
+	l = avahi_string_list_add_printf(l, "cookie=0x%08x", info->cookie);
+
+	return l;
+}
+
+static void publish_service(struct service *s);
+
+static void service_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata)
+{
+	struct service *s = userdata;
+
+	spa_assert(s);
+
+	switch (state) {
+	case AVAHI_ENTRY_GROUP_ESTABLISHED:
+		pw_log_info("Successfully established service %s.", s->service_name);
+		break;
+
+	case AVAHI_ENTRY_GROUP_COLLISION:
+		char *t;
+
+		t = avahi_alternative_service_name(s->service_name);
+		pw_log_info("Name collision, renaming %s to %s.", s->service_name, t);
+		free(s->service_name);
+		s->service_name = t;
+
+		publish_service(s);
+		break;
+
+	case AVAHI_ENTRY_GROUP_FAILURE:
+		pw_log_error("Failed to register service: %s",
+				avahi_strerror(avahi_client_errno(avahi_entry_group_get_client(g))));
+		avahi_entry_group_free(g);
+		s->entry_group = NULL;
+		break;
+
+	case AVAHI_ENTRY_GROUP_UNCOMMITED:
+	case AVAHI_ENTRY_GROUP_REGISTERING:
+		break;
+	}
+}
+
+#define PA_CHANNEL_MAP_SNPRINT_MAX 336
+
+static void publish_service(struct service *s)
+{
+	AvahiStringList *txt = NULL;
+	const char *t;
+	char cm[PA_CHANNEL_MAP_SNPRINT_MAX];
+
+	const char * const subtype_text[] = {
+		[SUBTYPE_HARDWARE] = "hardware",
+		[SUBTYPE_VIRTUAL] = "virtual",
+		[SUBTYPE_MONITOR] = "monitor"
+	};
+
+	spa_assert(s);
+
+	if (!s->userdata->client || avahi_client_get_state(s->userdata->client) != AVAHI_CLIENT_S_RUNNING)
+		return;
+
+	if (!s->entry_group) {
+		if (!(s->entry_group =
+		avahi_entry_group_new(s->userdata->client, service_entry_group_callback, s))) {
+			pw_log_error("avahi_entry_group_new(): %s",
+					avahi_strerror(avahi_client_errno(s->userdata->client)));
+			goto finish;
+		}
+	} else
+		avahi_entry_group_reset(s->entry_group);
+
+	txt = txt_record_server_data(s->userdata->manager->info, txt);
+
+	txt = avahi_string_list_add_pair(txt, "device", s->name);
+	txt = avahi_string_list_add_printf(txt, "rate=%u", s->ss.rate);
+	txt = avahi_string_list_add_printf(txt, "channels=%u", s->ss.channels);
+	txt = avahi_string_list_add_pair(txt, "format", format_id2name(s->ss.format));
+	txt = avahi_string_list_add_pair(txt, "channel_map", channel_map_snprint(cm, sizeof(cm), &s->cm));
+	txt = avahi_string_list_add_pair(txt, "subtype", subtype_text[s->subtype]);
+
+	if ((t = pw_properties_get(s->props, PW_KEY_NODE_DESCRIPTION)))
+		txt = avahi_string_list_add_pair(txt, "description", t);
+	if ((t = pw_properties_get(s->props, PW_KEY_DEVICE_VENDOR_NAME)))
+		txt = avahi_string_list_add_pair(txt, "vendor-name", t);
+	if ((t = pw_properties_get(s->props, PW_KEY_DEVICE_PRODUCT_NAME)))
+		txt = avahi_string_list_add_pair(txt, "product-name", t);
+	if ((t = pw_properties_get(s->props, PW_KEY_DEVICE_CLASS)))
+		txt = avahi_string_list_add_pair(txt, "class", t);
+	if ((t = pw_properties_get(s->props, PW_KEY_DEVICE_FORM_FACTOR)))
+		txt = avahi_string_list_add_pair(txt, "form-factor", t);
+	if ((t = pw_properties_get(s->props, PW_KEY_DEVICE_ICON_NAME)))
+		txt = avahi_string_list_add_pair(txt, "icon-name", t);
+
+	if (avahi_entry_group_add_service_strlst(
+				s->entry_group,
+				AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
+				0,
+				s->service_name,
+				s->service_type,
+				NULL,
+				NULL,
+				s->userdata->port,
+				txt) < 0) {
+		pw_log_error("avahi_entry_group_add_service_strlst(): %s",
+			avahi_strerror(avahi_client_errno(s->userdata->client)));
+		goto finish;
+	}
+
+	if (avahi_entry_group_add_service_subtype(
+				s->entry_group,
+				AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
+				0,
+				s->service_name,
+				s->service_type,
+				NULL,
+				s->is_sink ? (s->subtype == SUBTYPE_HARDWARE ? SERVICE_SUBTYPE_SINK_HARDWARE : SERVICE_SUBTYPE_SINK_VIRTUAL) :
+				(s->subtype == SUBTYPE_HARDWARE ? SERVICE_SUBTYPE_SOURCE_HARDWARE : (s->subtype == SUBTYPE_VIRTUAL ? SERVICE_SUBTYPE_SOURCE_VIRTUAL : SERVICE_SUBTYPE_SOURCE_MONITOR))) < 0) {
+
+		pw_log_error("avahi_entry_group_add_service_subtype(): %s",
+			avahi_strerror(avahi_client_errno(s->userdata->client)));
+		goto finish;
+	}
+
+	if (!s->is_sink && s->subtype != SUBTYPE_MONITOR) {
+		if (avahi_entry_group_add_service_subtype(
+					s->entry_group,
+					AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC,
+					0,
+					s->service_name,
+					SERVICE_TYPE_SOURCE,
+					NULL,
+					SERVICE_SUBTYPE_SOURCE_NON_MONITOR) < 0) {
+			pw_log_error("avahi_entry_group_add_service_subtype(): %s",
+					avahi_strerror(avahi_client_errno(s->userdata->client)));
+					goto finish;
+		}
+	}
+
+	if (avahi_entry_group_commit(s->entry_group) < 0) {
+		pw_log_error("avahi_entry_group_commit(): %s",
+				avahi_strerror(avahi_client_errno(s->userdata->client)));
+		goto finish;
+	}
+
+	pw_log_info("Successfully created entry group for %s.", s->service_name);
+
+finish:
+	avahi_string_list_free(txt);
+}
+
+static void client_callback(AvahiClient *c, AvahiClientState state, void *d)
+{
+	struct module_zeroconf_publish_data *data = d;
+
+	spa_assert(c);
+	spa_assert(data);
+
+	data->client = c;
+
+	switch (state) {
+	case AVAHI_CLIENT_S_RUNNING:
+		break;
+	case AVAHI_CLIENT_S_COLLISION:
+		pw_log_error("Host name collision");
+		unpublish_all_services(d, false);
+		break;
+	case AVAHI_CLIENT_FAILURE:
+		if (avahi_client_errno(c) == AVAHI_ERR_DISCONNECTED) {
+			int error;
+
+			pw_log_debug("Avahi daemon disconnected.");
+
+			unpublish_all_services(d, true);
+			avahi_client_free(data->client);
+
+			if (!(data->client = avahi_client_new(data->avahi_poll,
+					AVAHI_CLIENT_NO_FAIL, client_callback, data, &error))) {
+				pw_log_error("avahi_client_new() failed: %s",
+						avahi_strerror(error));
+				module_schedule_unload(data->module);
+			}
+		}
+		break;
+	default:
+		break;
+}
+}
+
+static void manager_updated(void *d, struct pw_manager_object *o)
+{
+	struct service *s;
+	char *service_name;
+
+	if (!pw_manager_object_is_sink(o) && !pw_manager_object_is_source(o))
+		return;
+
+	service_name = get_service_name(o);
+
+	s = pw_manager_object_add_data(o, service_name, sizeof(struct service));
+
+	free(service_name);
+	spa_assert(s);
+
+	publish_service(s);
+}
+
+static void manager_removed(void *d, struct pw_manager_object *o)
+{
+	if (!pw_manager_object_is_sink(o) && !pw_manager_object_is_source(o))
+		return;
+
+	service_free(d, o);
+}
+
+static void manager_added(void *d, struct pw_manager_object *o)
+{
+	struct service *s;
+
+	if (!pw_manager_object_is_sink(o) && !pw_manager_object_is_source(o))
+		return;
+
+	s = get_service(d, o);
+
+	publish_service(s);
+}
+
+static const struct pw_manager_events manager_events = {
+	PW_VERSION_MANAGER_EVENTS,
+	.added = manager_added,
+	.updated = manager_updated,
+	.removed = manager_removed,
+};
+
+static int module_zeroconf_publish_load(struct client *client, struct module *module)
+{
+	struct module_zeroconf_publish_data *data = module->user_data;
+	struct pw_loop *loop;
+	int error;
+
+	data->core = pw_context_connect(module->impl->context,
+			pw_properties_copy(client->props), 0);
+	if (data->core == NULL) {
+		pw_log_error("Failed to connect to pipewire context");
+		return -errno;
+	}
+
+	pw_core_add_listener(data->core,
+			&data->core_listener,
+			&core_events, data);
+
+	loop = pw_context_get_main_loop(module->impl->context);
+	data->avahi_poll = pw_avahi_poll_new(loop);
+
+	data->client = avahi_client_new(data->avahi_poll, AVAHI_CLIENT_NO_FAIL,
+			client_callback, data, &error);
+	if (!data->client) {
+		pw_log_error("avahi_client_new() failed: %s", avahi_strerror(error));
+		pw_avahi_poll_free(data->avahi_poll);
+		return -errno;
+	}
+
+	data->manager = pw_manager_new(data->core);
+	if (client->manager == NULL) {
+		pw_log_error("Failed to create pipewire manager");
+		avahi_client_free(data->client);
+		pw_avahi_poll_free(data->avahi_poll);
+		return -errno;
+	}
+
+	pw_manager_add_listener(data->manager, &data->manager_listener,
+			&manager_events, data);
+
+	pw_log_info("loaded module %p id:%u name:%s", module, module->idx, module->name);
+	module_emit_loaded(module, 0);
+
+	return 0;
+}
+
+static int module_zeroconf_publish_unload(struct client *client, struct module *module)
+{
+	struct module_zeroconf_publish_data *d = module->user_data;
+
+	pw_log_info("unload module %p id:%u name:%s", module, module->idx, module->name);
+
+	pw_manager_for_each_object(d->manager, service_free, d);
+
+	if (d->client)
+		avahi_client_free(d->client);
+
+	if (d->avahi_poll)
+		pw_avahi_poll_free(d->avahi_poll);
+
+	if (d->manager != NULL) {
+		spa_hook_remove(&d->manager_listener);
+		pw_manager_destroy(d->manager);
+	}
+
+	if (d->core != NULL) {
+		spa_hook_remove(&d->core_listener);
+		pw_core_disconnect(d->core);
+	}
+
+	return 0;
+}
+
+static const struct module_methods module_zeroconf_publish_methods = {
+	VERSION_MODULE_METHODS,
+	.load = module_zeroconf_publish_load,
+	.unload = module_zeroconf_publish_unload,
+};
+
+static const struct spa_dict_item module_zeroconf_publish_info[] = {
+	{ PW_KEY_MODULE_AUTHOR, "Sanchayan Maity <sanchayan@asymptotic.io" },
+	{ PW_KEY_MODULE_DESCRIPTION, "mDNS/DNS-SD Service Publish" },
+	{ PW_KEY_MODULE_USAGE, "port=<TCP port number>" },
+	{ PW_KEY_MODULE_VERSION, PACKAGE_VERSION },
+};
+
+struct module *create_module_zeroconf_publish(struct impl *impl, const char *argument)
+{
+	struct module *module;
+	struct module_zeroconf_publish_data *d;
+	struct pw_properties *props = NULL;
+	const char *port;
+	int res;
+
+	props = pw_properties_new_dict(&SPA_DICT_INIT_ARRAY(module_zeroconf_publish_info));
+	if (!props) {
+		res = -errno;
+		goto out;
+	}
+	if (argument)
+		module_args_add_props(props, argument);
+
+	module = module_new(impl, &module_zeroconf_publish_methods, sizeof(*d));
+	if (module == NULL) {
+		res = -errno;
+		goto out;
+	}
+
+	module->props = props;
+	d = module->user_data;
+	d->module = module;
+
+	if ((port = pw_properties_get(props, "port")) == NULL)
+		d->port = PW_PROTOCOL_PULSE_DEFAULT_PORT;
+	else
+		d->port = atoi(port);
+
+
+	return module;
+out:
+	pw_properties_free(props);
+	errno = -res;
+	return NULL;
+}

src/modules/module-protocol-pulse/modules/registry.h

@@ -42,5 +42,6 @@ struct module *create_module_tunnel_source(struct impl *impl, const char *argume
 struct module *create_module_simple_protocol_tcp(struct impl *impl, const char *argument);
 struct module *create_module_pipe_sink(struct impl *impl, const char *argument);
 struct module *create_module_zeroconf_discover(struct impl *impl, const char *argument);
+struct module *create_module_zeroconf_publish(struct impl *impl, const char *argument);
 
 #endif