pipewire-pulse: add zeroconf module

src/modules/meson.build

@@ -142,6 +142,7 @@ pipewire_module_protocol_pulse = shared_library('pipewire-module-protocol-pulse'
     'module-protocol-pulse/modules/module-simple-protocol-tcp.c',
     'module-protocol-pulse/modules/module-tunnel-sink.c',
     'module-protocol-pulse/modules/module-tunnel-source.c',
+    'module-protocol-pulse/modules/module-zeroconf-discover.c',
   ],
   c_args : pipewire_module_c_args,
   include_directories : [configinc, spa_inc],

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

@@ -223,6 +223,7 @@ static const struct module_info module_list[] = {
 	{ "module-simple-protocol-tcp", create_module_simple_protocol_tcp, },
 	{ "module-tunnel-sink", create_module_tunnel_sink, },
 	{ "module-tunnel-source", create_module_tunnel_source, },
+	{ "module-zeroconf-discover", create_module_zeroconf_discover, },
 	{ NULL, }
 };
 

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

@@ -0,0 +1,138 @@
+/* PipeWire
+ *
+ * Copyright © 2021 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * 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 <spa/utils/hook.h>
+#include <pipewire/pipewire.h>
+#include <pipewire/private.h>
+
+#include "../defs.h"
+#include "../module.h"
+#include "registry.h"
+
+#define ERROR_RETURN(str)		\
+	{				\
+		pw_log_error(str);	\
+		res = -EINVAL;		\
+		goto out;		\
+	}
+
+struct module_zeroconf_discover_data {
+	struct module *module;
+
+	struct spa_hook mod_listener;
+	struct pw_impl_module *mod;
+};
+
+static void module_destroy(void *data)
+{
+	struct module_zeroconf_discover_data *d = data;
+	spa_hook_remove(&d->mod_listener);
+	d->mod = NULL;
+	module_schedule_unload(d->module);
+}
+
+static const struct pw_impl_module_events module_events = {
+	PW_VERSION_IMPL_MODULE_EVENTS,
+	.destroy = module_destroy
+};
+
+static int module_zeroconf_discover_load(struct client *client, struct module *module)
+{
+	struct module_zeroconf_discover_data *data = module->user_data;
+
+	data->mod = pw_context_load_module(module->impl->context,
+			"libpipewire-module-zeroconf-discover",
+			NULL, NULL);
+	if (data->mod == NULL)
+		return -errno;
+
+	pw_impl_module_add_listener(data->mod,
+			&data->mod_listener,
+			&module_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_discover_unload(struct client *client, struct module *module)
+{
+	struct module_zeroconf_discover_data *d = module->user_data;
+
+	pw_log_info("unload module %p id:%u name:%s", module, module->idx, module->name);
+
+	if (d->mod) {
+		spa_hook_remove(&d->mod_listener);
+		pw_impl_module_destroy(d->mod);
+		d->mod = NULL;
+	}
+	return 0;
+}
+
+static const struct module_methods module_zeroconf_discover_methods = {
+	VERSION_MODULE_METHODS,
+	.load = module_zeroconf_discover_load,
+	.unload = module_zeroconf_discover_unload,
+};
+
+static const struct spa_dict_item module_zeroconf_discover_info[] = {
+	{ PW_KEY_MODULE_AUTHOR, "Wim Taymans <wim.taymans@gmail.con>" },
+	{ PW_KEY_MODULE_DESCRIPTION, "mDNS/DNS-SD Service Discovery" },
+	{ PW_KEY_MODULE_USAGE, "" },
+	{ PW_KEY_MODULE_VERSION, PACKAGE_VERSION },
+};
+
+struct module *create_module_zeroconf_discover(struct impl *impl, const char *argument)
+{
+	struct module *module;
+	struct module_zeroconf_discover_data *d;
+	struct pw_properties *props = NULL;
+	int res;
+
+	props = pw_properties_new_dict(&SPA_DICT_INIT_ARRAY(module_zeroconf_discover_info));
+	if (props == NULL) {
+		res = -errno;
+		goto out;
+	}
+	if (argument != NULL)
+		module_args_add_props(props, argument);
+
+	module = module_new(impl, &module_zeroconf_discover_methods, sizeof(*d));
+	if (module == NULL) {
+		res = -errno;
+		goto out;
+	}
+
+	module->props = props;
+	d = module->user_data;
+	d->module = module;
+
+	return module;
+out:
+	if (props)
+		pw_properties_free(props);
+	errno = -res;
+	return NULL;
+}

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

@@ -39,5 +39,6 @@ struct module *create_module_tunnel_sink(struct impl *impl, const char *argument
 struct module *create_module_tunnel_source(struct impl *impl, const char *argument);
 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);
 
 #endif

src/modules/module-zeroconf-discover.c

@@ -479,7 +479,7 @@ int pipewire__module_init(struct pw_impl_module *module, const char *args)
 
 	pw_log_debug("module %p: new %s", impl, args);
 
-	if (args)
+	if (args == NULL)
 		args = "";
 
 	props = pw_properties_new_string(args);