Make simple node policypolicy-node

Make it possible to run the session manager without endpoint
modules. Add a simple node policy that links nodes.

Move the session-manager implementation and startup of the
endpoint monitors to a separate module.

Handle async set_param on the device

9 files changed, 1569 insertions, 133 deletions

diff --git a/src/examples/media-session/alsa-monitor.c b/src/examples/media-session/alsa-monitor.c
index 992c2959..ed9d8708 100644
--- a/src/examples/media-session/alsa-monitor.c
+++ b/src/examples/media-session/alsa-monitor.c
@@ -39,9 +39,10 @@
 #include <spa/utils/hook.h>
 #include <spa/utils/names.h>
 #include <spa/utils/keys.h>
-#include <spa/param/audio/format-utils.h>
 #include <spa/param/props.h>
+#include <spa/pod/builder.h>
 #include <spa/debug/dict.h>
+#include <spa/debug/pod.h>
 #include <spa/support/dbus.h>
 
 #include <pipewire/pipewire.h>
@@ -240,6 +241,7 @@ static struct node *alsa_create_node(struct device *device, uint32_t id,
 		res = -errno;
 		goto clean_node;
 	}
+
 	spa_list_append(&device->node_list, &node->link);
 
 	return node;
diff --git a/src/examples/media-session/bluez-endpoint.c b/src/examples/media-session/bluez-endpoint.c
new file mode 100644
index 00000000..1ba4b29f
--- /dev/null
+++ b/src/examples/media-session/bluez-endpoint.c
@@ -0,0 +1,694 @@
+/* PipeWire
+ *
+ * Copyright © 2019 Wim Taymans
+ *
+ * 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 <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <math.h>
+#include <time.h>
+
+#include "config.h"
+
+#include <spa/node/node.h>
+#include <spa/utils/hook.h>
+#include <spa/utils/result.h>
+#include <spa/utils/names.h>
+#include <spa/utils/keys.h>
+#include <spa/param/audio/format-utils.h>
+#include <spa/param/props.h>
+#include <spa/debug/dict.h>
+#include <spa/debug/pod.h>
+
+#include "pipewire/pipewire.h"
+
+#include <extensions/session-manager.h>
+
+#include "media-session.h"
+
+#define NAME		"bluez-endpoint"
+#define SESSION_KEY	"bluez-endpoint"
+
+struct endpoint {
+	struct spa_list link;
+
+	struct impl *impl;
+
+	struct pw_properties *props;
+
+	struct node *node;
+	struct spa_hook listener;
+
+	struct pw_client_endpoint *client_endpoint;
+	struct spa_hook proxy_listener;
+	struct spa_hook client_endpoint_listener;
+	struct pw_endpoint_info info;
+
+	struct spa_param_info params[5];
+
+	struct endpoint *monitor;
+
+	struct spa_audio_info format;
+
+	struct spa_list stream_list;
+};
+
+struct stream {
+	struct spa_list link;
+	struct endpoint *endpoint;
+
+	struct pw_properties *props;
+	struct pw_endpoint_stream_info info;
+
+	struct spa_audio_info format;
+
+	unsigned int active:1;
+};
+
+struct node {
+	struct impl *impl;
+	struct sm_node *node;
+
+	struct device *device;
+
+	struct endpoint *endpoint;
+};
+
+struct device {
+	struct impl *impl;
+	uint32_t id;
+	struct sm_device *device;
+	struct spa_hook listener;
+
+	struct spa_list endpoint_list;
+};
+
+struct impl {
+	struct sm_media_session *session;
+	struct spa_hook listener;
+};
+
+static int client_endpoint_set_session_id(void *object, uint32_t id)
+{
+	struct endpoint *endpoint = object;
+	endpoint->info.session_id = id;
+	return 0;
+}
+
+static int client_endpoint_set_param(void *object,
+		uint32_t id, uint32_t flags, const struct spa_pod *param)
+{
+	struct endpoint *endpoint = object;
+	struct impl *impl = endpoint->impl;
+	pw_log_debug(NAME " %p: endpoint %p set param %d", impl, endpoint, id);
+	return pw_node_set_param((struct pw_node*)endpoint->node->node->obj.proxy,
+				id, flags, param);
+}
+
+
+static int client_endpoint_stream_set_param(void *object, uint32_t stream_id,
+		uint32_t id, uint32_t flags, const struct spa_pod *param)
+{
+	return -ENOTSUP;
+}
+
+static int stream_set_active(struct endpoint *endpoint, struct stream *stream, bool active)
+{
+	char buf[1024];
+	struct spa_pod_builder b = { 0, };
+	struct spa_pod *param;
+
+	if (stream->active == active)
+		return 0;
+
+	if (active) {
+		stream->format.info.raw.rate = 48000;
+
+		spa_pod_builder_init(&b, buf, sizeof(buf));
+		param = spa_format_audio_raw_build(&b, SPA_PARAM_Format, &stream->format.info.raw);
+		param = spa_pod_builder_add_object(&b,
+			SPA_TYPE_OBJECT_ParamPortConfig, SPA_PARAM_PortConfig,
+			SPA_PARAM_PORT_CONFIG_direction, SPA_POD_Id(endpoint->info.direction),
+			SPA_PARAM_PORT_CONFIG_mode,	 SPA_POD_Id(SPA_PARAM_PORT_CONFIG_MODE_dsp),
+			SPA_PARAM_PORT_CONFIG_monitor,   SPA_POD_Bool(true),
+			SPA_PARAM_PORT_CONFIG_format,    SPA_POD_Pod(param));
+
+		if (pw_log_level_enabled(SPA_LOG_LEVEL_DEBUG))
+			spa_debug_pod(2, NULL, param);
+
+		pw_node_set_param((struct pw_node*)endpoint->node->node->obj.proxy,
+				SPA_PARAM_PortConfig, 0, param);
+	}
+	stream->active = active;
+	return 0;
+}
+
+static int client_endpoint_create_link(void *object, const struct spa_dict *props)
+{
+	struct endpoint *endpoint = object;
+	struct impl *impl = endpoint->impl;
+	struct pw_properties *p;
+	int res;
+
+	pw_log_debug(NAME" %p: endpoint %p", impl, endpoint);
+
+	if (props == NULL)
+		return -EINVAL;
+
+	p = pw_properties_new_dict(props);
+	if (p == NULL)
+		return -errno;
+
+	if (endpoint->info.direction == PW_DIRECTION_OUTPUT) {
+		const char *str;
+		struct sm_object *obj;
+
+		str = spa_dict_lookup(props, PW_KEY_ENDPOINT_LINK_INPUT_ENDPOINT);
+		if (str == NULL) {
+			pw_log_warn(NAME" %p: no target endpoint given", impl);
+			res = -EINVAL;
+			goto exit;
+		}
+		obj = sm_media_session_find_object(impl->session, atoi(str));
+		if (obj == NULL || strcmp(obj->type, PW_TYPE_INTERFACE_Endpoint) !=0) {
+			pw_log_warn(NAME" %p: could not find endpoint %s (%p)", impl, str, obj);
+			res = -EINVAL;
+			goto exit;
+		}
+
+		pw_properties_setf(p, PW_KEY_LINK_OUTPUT_NODE, "%d", endpoint->node->node->info->id);
+		pw_properties_setf(p, PW_KEY_LINK_OUTPUT_PORT, "-1");
+
+		pw_endpoint_create_link((struct pw_endpoint*)obj->proxy, &p->dict);
+	} else {
+		pw_properties_setf(p, PW_KEY_LINK_INPUT_NODE, "%d", endpoint->node->node->info->id);
+		pw_properties_setf(p, PW_KEY_LINK_INPUT_PORT, "-1");
+
+		sm_media_session_create_links(impl->session, &p->dict);
+	}
+
+	res = 0;
+exit:
+	pw_properties_free(p);
+
+	return res;
+}
+
+static const struct pw_client_endpoint_events client_endpoint_events = {
+	PW_VERSION_CLIENT_ENDPOINT_EVENTS,
+	.set_session_id = client_endpoint_set_session_id,
+	.set_param = client_endpoint_set_param,
+	.stream_set_param = client_endpoint_stream_set_param,
+	.create_link = client_endpoint_create_link,
+};
+
+static struct stream *endpoint_add_stream(struct endpoint *endpoint)
+{
+	struct stream *s;
+	const char *str;
+
+	s = calloc(1, sizeof(*s));
+	if (s == NULL)
+		return NULL;
+
+	s->props = pw_properties_new(NULL, NULL);
+	s->endpoint = endpoint;
+
+	if ((str = pw_properties_get(endpoint->props, PW_KEY_MEDIA_CLASS)) != NULL)
+		pw_properties_set(s->props, PW_KEY_MEDIA_CLASS, str);
+	if ((str = pw_properties_get(endpoint->props, PW_KEY_PRIORITY_SESSION)) != NULL)
+		pw_properties_set(s->props, PW_KEY_PRIORITY_SESSION, str);
+	if (endpoint->info.direction == PW_DIRECTION_OUTPUT) {
+		if (endpoint->monitor != NULL)
+			pw_properties_set(s->props, PW_KEY_ENDPOINT_STREAM_NAME, "Monitor");
+		else
+			pw_properties_set(s->props, PW_KEY_ENDPOINT_STREAM_NAME, "Capture");
+	} else {
+		pw_properties_set(s->props, PW_KEY_ENDPOINT_STREAM_NAME, "Playback");
+	}
+
+	s->info.version = PW_VERSION_ENDPOINT_STREAM_INFO;
+	s->info.id = endpoint->info.n_streams;
+	s->info.endpoint_id = endpoint->info.id;
+	s->info.name = (char*)pw_properties_get(s->props, PW_KEY_ENDPOINT_STREAM_NAME);
+	s->info.change_mask = PW_ENDPOINT_STREAM_CHANGE_MASK_PROPS;
+	s->info.props = &s->props->dict;
+	s->format = endpoint->format;
+
+	pw_log_debug("stream %d", s->info.id);
+	pw_client_endpoint_stream_update(endpoint->client_endpoint,
+			s->info.id,
+			PW_CLIENT_ENDPOINT_STREAM_UPDATE_INFO,
+			0, NULL,
+			&s->info);
+
+	spa_list_append(&endpoint->stream_list, &s->link);
+	endpoint->info.n_streams++;
+
+	return s;
+}
+
+static void destroy_stream(struct stream *stream)
+{
+	struct endpoint *endpoint = stream->endpoint;
+
+	pw_client_endpoint_stream_update(endpoint->client_endpoint,
+			stream->info.id,
+			PW_CLIENT_ENDPOINT_STREAM_UPDATE_DESTROYED,
+			0, NULL,
+			&stream->info);
+
+	spa_list_remove(&stream->link);
+	endpoint->info.n_streams--;
+
+	pw_properties_free(stream->props);
+	free(stream);
+}
+
+static void update_params(void *data)
+{
+	uint32_t n_params;
+	const struct spa_pod **params;
+	struct endpoint *endpoint = data;
+	struct sm_node *node = endpoint->node->node;
+	struct sm_param *p;
+
+	pw_log_debug(NAME" %p: endpoint", endpoint);
+
+	params = alloca(sizeof(struct spa_pod *) * node->n_params);
+	n_params = 0;
+	spa_list_for_each(p, &node->param_list, link) {
+		switch (p->id) {
+		case SPA_PARAM_Props:
+		case SPA_PARAM_PropInfo:
+			params[n_params++] = p->param;
+			break;
+		default:
+			break;
+		}
+	}
+
+	pw_client_endpoint_update(endpoint->client_endpoint,
+			PW_CLIENT_ENDPOINT_UPDATE_PARAMS |
+			PW_CLIENT_ENDPOINT_UPDATE_INFO,
+			n_params, params,
+			&endpoint->info);
+}
+
+static struct endpoint *create_endpoint(struct node *node, struct endpoint *monitor);
+
+static void object_update(void *data)
+{
+	struct endpoint *endpoint = data;
+	struct impl *impl = endpoint->impl;
+	struct sm_node *node = endpoint->node->node;
+
+	pw_log_debug(NAME" %p: endpoint %p", impl, endpoint);
+
+	if (node->obj.changed & SM_NODE_CHANGE_MASK_PARAMS)
+		update_params(endpoint);
+}
+
+static const struct sm_object_events object_events = {
+	SM_VERSION_OBJECT_EVENTS,
+	.update = object_update
+};
+
+static void complete_endpoint(void *data)
+{
+	struct endpoint *endpoint = data;
+	struct stream *stream;
+	struct sm_param *p;
+
+	pw_log_debug("endpoint %p: complete", endpoint);
+
+	spa_list_for_each(p, &endpoint->node->node->param_list, link) {
+		struct spa_audio_info info = { 0, };
+
+		if (p->id != SPA_PARAM_EnumFormat)
+			continue;
+
+		if (spa_format_parse(p->param, &info.media_type, &info.media_subtype) < 0)
+			continue;
+
+		if (info.media_type != SPA_MEDIA_TYPE_audio ||
+		    info.media_subtype != SPA_MEDIA_SUBTYPE_raw)
+			continue;
+
+		spa_pod_object_fixate((struct spa_pod_object*)p->param);
+		if (pw_log_level_enabled(SPA_LOG_LEVEL_DEBUG))
+			spa_debug_pod(2, NULL, p->param);
+
+		if (spa_format_audio_raw_parse(p->param, &info.info.raw) < 0)
+			continue;
+
+		if (endpoint->format.info.raw.channels < info.info.raw.channels)
+			endpoint->format = info;
+	}
+
+	pw_client_endpoint_update(endpoint->client_endpoint,
+			PW_CLIENT_ENDPOINT_UPDATE_INFO,
+			0, NULL,
+			&endpoint->info);
+
+	stream = endpoint_add_stream(endpoint);
+
+	if (endpoint->info.direction == PW_DIRECTION_INPUT) {
+		struct endpoint *monitor;
+
+		/* make monitor for sinks */
+		monitor = create_endpoint(endpoint->node, endpoint);
+		if (monitor == NULL)
+			return;
+
+		endpoint_add_stream(monitor);
+	}
+	stream_set_active(endpoint, stream, true);
+
+	sm_object_add_listener(&endpoint->node->node->obj, &endpoint->listener, &object_events, endpoint);
+}
+
+static void proxy_destroy(void *data)
+{
+	struct endpoint *endpoint = data;
+	struct stream *s;
+
+	spa_list_consume(s, &endpoint->stream_list, link)
+		destroy_stream(s);
+
+	pw_properties_free(endpoint->props);
+	spa_list_remove(&endpoint->link);
+	spa_hook_remove(&endpoint->proxy_listener);
+	spa_hook_remove(&endpoint->client_endpoint_listener);
+	endpoint->client_endpoint = NULL;
+}
+
+static void proxy_bound(void *data, uint32_t id)
+{
+	struct endpoint *endpoint = data;
+	endpoint->info.id = id;
+}
+
+static const struct pw_proxy_events proxy_events = {
+	PW_VERSION_PROXY_EVENTS,
+	.destroy = proxy_destroy,
+	.bound = proxy_bound,
+};
+
+static struct endpoint *create_endpoint(struct node *node, struct endpoint *monitor)
+{
+	struct impl *impl = node->impl;
+	struct device *device = node->device;
+	struct pw_properties *props;
+	struct endpoint *endpoint;
+	struct pw_proxy *proxy;
+	const char *str, *media_class = NULL, *name = NULL;
+	uint32_t subscribe[4], n_subscribe = 0;
+	struct pw_properties *pr = node->node->obj.props;
+	enum pw_direction direction;
+
+	if (pr == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	if ((media_class = pw_properties_get(pr, PW_KEY_MEDIA_CLASS)) == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	props = pw_properties_new(NULL, NULL);
+	if (props == NULL)
+		return NULL;
+
+	if (strstr(media_class, "Source") != NULL) {
+		direction = PW_DIRECTION_OUTPUT;
+	} else if (strstr(media_class, "Sink") != NULL) {
+		direction = PW_DIRECTION_INPUT;
+	} else {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	if (monitor != NULL) {
+		pw_properties_set(props, PW_KEY_MEDIA_CLASS, "Audio/Source");
+		direction = PW_DIRECTION_OUTPUT;
+	} else {
+		pw_properties_set(props, PW_KEY_MEDIA_CLASS, media_class);
+	}
+
+	if ((str = pw_properties_get(pr, PW_KEY_PRIORITY_SESSION)) != NULL)
+		pw_properties_set(props, PW_KEY_PRIORITY_SESSION, str);
+	if ((name = pw_properties_get(pr, PW_KEY_NODE_DESCRIPTION)) != NULL) {
+		if (monitor != NULL) {
+			pw_properties_setf(props, PW_KEY_ENDPOINT_NAME, "Monitor of %s", monitor->info.name);
+			pw_properties_setf(props, PW_KEY_ENDPOINT_MONITOR, "%d", monitor->info.id);
+		} else {
+			pw_properties_set(props, PW_KEY_ENDPOINT_NAME, name);
+		}
+	}
+	if ((str = pw_properties_get(pr, PW_KEY_DEVICE_ICON_NAME)) != NULL)
+		pw_properties_set(props, PW_KEY_ENDPOINT_ICON_NAME, str);
+
+	proxy = sm_media_session_create_object(impl->session,
+						"client-endpoint",
+						PW_TYPE_INTERFACE_ClientEndpoint,
+						PW_VERSION_CLIENT_ENDPOINT,
+						&props->dict, sizeof(*endpoint));
+	if (proxy == NULL) {
+		pw_properties_free(props);
+		return NULL;
+	}
+
+	endpoint = pw_proxy_get_user_data(proxy);
+	endpoint->impl = impl;
+	endpoint->node = node;
+	endpoint->monitor = monitor;
+	endpoint->props = props;
+	endpoint->client_endpoint = (struct pw_client_endpoint *) proxy;
+	endpoint->info.version = PW_VERSION_ENDPOINT_INFO;
+	endpoint->info.name = (char*)pw_properties_get(endpoint->props, PW_KEY_ENDPOINT_NAME);
+	endpoint->info.media_class = (char*)pw_properties_get(endpoint->props, PW_KEY_MEDIA_CLASS);
+	endpoint->info.session_id = impl->session->session->obj.id;
+	endpoint->info.direction = direction;
+	endpoint->info.flags = 0;
+	endpoint->info.change_mask =
+		PW_ENDPOINT_CHANGE_MASK_STREAMS |
+		PW_ENDPOINT_CHANGE_MASK_SESSION |
+		PW_ENDPOINT_CHANGE_MASK_PROPS |
+		PW_ENDPOINT_CHANGE_MASK_PARAMS;
+	endpoint->info.n_streams = 0;
+	endpoint->info.props = &endpoint->props->dict;
+	endpoint->params[0] = SPA_PARAM_INFO(SPA_PARAM_PropInfo, SPA_PARAM_INFO_READ);
+	endpoint->params[1] = SPA_PARAM_INFO(SPA_PARAM_Props, SPA_PARAM_INFO_READWRITE);
+	endpoint->info.params = endpoint->params;
+	endpoint->info.n_params = 2;
+	spa_list_init(&endpoint->stream_list);
+
+	pw_log_debug(NAME" %p: new endpoint %p for bluez node %p", impl, endpoint, node);
+	pw_proxy_add_listener(proxy,
+			&endpoint->proxy_listener,
+			&proxy_events, endpoint);
+
+	pw_client_endpoint_add_listener(endpoint->client_endpoint,
+			&endpoint->client_endpoint_listener,
+			&client_endpoint_events,
+			endpoint);
+
+	subscribe[n_subscribe++] = SPA_PARAM_EnumFormat;
+	subscribe[n_subscribe++] = SPA_PARAM_Props;
+	subscribe[n_subscribe++] = SPA_PARAM_PropInfo;
+	pw_log_debug(NAME" %p: endpoint %p proxy %p subscribe %d params", impl,
+				endpoint, node->node->obj.proxy, n_subscribe);
+	pw_node_subscribe_params((struct pw_node*)node->node->obj.proxy,
+				subscribe, n_subscribe);
+
+	spa_list_append(&device->endpoint_list, &endpoint->link);
+
+	if (monitor == NULL)
+		sm_media_session_sync(impl->session, complete_endpoint, endpoint);
+
+	return endpoint;
+}
+
+static void destroy_endpoint(struct endpoint *endpoint)
+{
+	if (endpoint->client_endpoint)
+		pw_proxy_destroy((struct pw_proxy*)endpoint->client_endpoint);
+}
+
+/** fallback, one stream for each node */
+static int setup_bluez_endpoint(struct device *device)
+{
+	struct impl *impl = device->impl;
+	struct sm_node *n;
+	struct sm_device *d = device->device;
+
+	pw_log_debug(NAME" %p: device %p fallback", impl, d);
+
+	spa_list_for_each(n, &d->node_list, link) {
+		struct node *node;
+
+		pw_log_debug(NAME" %p: device %p has node %p", impl, d, n);
+
+		node = sm_object_add_data(&n->obj, SESSION_KEY, sizeof(struct node));
+		node->device = device;
+		node->node = n;
+		node->impl = impl;
+		node->endpoint = create_endpoint(node, NULL);
+		if (node->endpoint == NULL)
+			return -errno;
+	}
+	return 0;
+}
+
+static int activate_device(struct device *device)
+{
+	return setup_bluez_endpoint(device);
+}
+
+static int deactivate_device(struct device *device)
+{
+	struct endpoint *e;
+	spa_list_consume(e, &device->endpoint_list, link)
+		destroy_endpoint(e);
+	return 0;
+}
+
+static void device_update(void *data)
+{
+	struct device *device = data;
+	struct impl *impl = device->impl;
+
+	pw_log_debug(NAME" %p: device %p %08x %08x", impl, device,
+			device->device->obj.avail, device->device->obj.changed);
+
+	if (!SPA_FLAG_IS_SET(device->device->obj.avail,
+			SM_DEVICE_CHANGE_MASK_INFO |
+			SM_DEVICE_CHANGE_MASK_NODES |
+			SM_DEVICE_CHANGE_MASK_PARAMS))
+		return;
+
+//	if (SPA_FLAG_IS_SET(device->device->obj.changed,
+//			SM_DEVICE_CHANGE_MASK_NODES |
+//			SM_DEVICE_CHANGE_MASK_PARAMS)) {
+		activate_device(device);
+//	}
+}
+
+static const struct sm_object_events device_events = {
+	SM_VERSION_OBJECT_EVENTS,
+	.update = device_update
+};
+
+static int
+handle_device(struct impl *impl, struct sm_object *obj)
+{
+	const char *media_class, *str;
+	struct device *device;
+
+	if (obj->props == NULL)
+		return 0;
+
+	media_class = pw_properties_get(obj->props, PW_KEY_MEDIA_CLASS);
+	str = pw_properties_get(obj->props, PW_KEY_DEVICE_API);
+
+	pw_log_debug(NAME" %p: device "PW_KEY_MEDIA_CLASS":%s api:%s", impl, media_class, str);
+
+	if (strstr(media_class, "Audio/") != media_class)
+		return 0;
+	if (strcmp(str, "bluez5") != 0)
+		return 0;
+
+	device = sm_object_add_data(obj, SESSION_KEY, sizeof(struct device));
+	device->impl = impl;
+	device->id = obj->id;
+	device->device = (struct sm_device*)obj;
+	spa_list_init(&device->endpoint_list);
+	pw_log_debug(NAME" %p: found bluez device %d media_class %s", impl, obj->id, media_class);
+
+	sm_object_add_listener(obj, &device->listener, &device_events, device);
+
+	return 0;
+}
+
+static void destroy_device(struct impl *impl, struct device *device)
+{
+	deactivate_device(device);
+	spa_hook_remove(&device->listener);
+	sm_object_remove_data((struct sm_object*)device->device, SESSION_KEY);
+}
+
+static void session_create(void *data, struct sm_object *object)
+{
+	struct impl *impl = data;
+	int res;
+
+	if (strcmp(object->type, PW_TYPE_INTERFACE_Device) == 0)
+		res = handle_device(impl, object);
+	else
+		res = 0;
+
+	if (res < 0) {
+		pw_log_warn(NAME" %p: can't handle global %d: %s", impl,
+				object->id, spa_strerror(res));
+	}
+}
+
+static void session_remove(void *data, struct sm_object *object)
+{
+	struct impl *impl = data;
+
+	if (strcmp(object->type, PW_TYPE_INTERFACE_Device) == 0) {
+		struct device *device;
+		if ((device = sm_object_get_data(object, SESSION_KEY)) != NULL)
+			destroy_device(impl, device);
+	}
+}
+
+static void session_destroy(void *data)
+{
+	struct impl *impl = data;
+	spa_hook_remove(&impl->listener);
+	free(impl);
+}
+
+static const struct sm_media_session_events session_events = {
+	SM_VERSION_MEDIA_SESSION_EVENTS,
+	.create = session_create,
+	.remove = session_remove,
+	.destroy = session_destroy,
+};
+
+int sm_bluez5_endpoint_start(struct sm_media_session *session)
+{
+	struct impl *impl;
+
+	impl = calloc(1, sizeof(struct impl));
+	if (impl == NULL)
+		return -errno;
+
+	impl->session = session;
+	sm_media_session_add_listener(session, &impl->listener, &session_events, impl);
+	return 0;
+}
diff --git a/src/examples/media-session/bluez-monitor.c b/src/examples/media-session/bluez-monitor.c
index 5c6f293e..0769a6f5 100644
--- a/src/examples/media-session/bluez-monitor.c
+++ b/src/examples/media-session/bluez-monitor.c
@@ -36,17 +36,21 @@
 #include <spa/utils/result.h>
 #include <spa/utils/names.h>
 #include <spa/utils/result.h>
-#include <spa/param/audio/format-utils.h>
+#include <spa/pod/builder.h>
 #include <spa/param/props.h>
 #include <spa/debug/dict.h>
+#include <spa/debug/pod.h>
 
 #include "pipewire/impl.h"
 #include "media-session.h"
 
+#define NAME "bluez5-monitor"
+
 struct device;
 
 struct node {
 	struct impl *impl;
+	enum pw_direction direction;
 	struct device *device;
 	struct spa_list link;
 	uint32_t id;
@@ -54,22 +58,29 @@ struct node {
 	struct pw_properties *props;
 
 	struct pw_impl_node *adapter;
-	struct pw_proxy *proxy;
+
+	struct sm_node *snode;
 };
 
 struct device {
 	struct impl *impl;
 	struct spa_list link;
 	uint32_t id;
+	uint32_t device_id;
+
+	int priority;
+	int profile;
 
 	struct pw_properties *props;
 
 	struct spa_handle *handle;
 	struct spa_device *device;
+	struct spa_hook device_listener;
 
 	struct sm_device *sdevice;
-	struct spa_hook device_listener;
+	struct spa_hook listener;
 
+	unsigned int appeared:1;
 	struct spa_list node_list;
 };
 
@@ -139,6 +150,7 @@ static struct node *bluez5_create_node(struct device *device, uint32_t id,
 	if (str == NULL)
 		str = "bluetooth-device";
 
+	pw_properties_setf(node->props, PW_KEY_DEVICE_ID, "%d", device->device_id);
 	pw_properties_setf(node->props, PW_KEY_NODE_NAME, "%s.%s", info->factory_name, str);
 	pw_properties_set(node->props, PW_KEY_NODE_DESCRIPTION, str);
 	pw_properties_set(node->props, "factory.name", info->factory_name);
@@ -163,10 +175,13 @@ static struct node *bluez5_create_node(struct device *device, uint32_t id,
 		res = -errno;
 		goto clean_node;
 	}
-	node->proxy = sm_media_session_export(impl->session,
-			PW_TYPE_INTERFACE_Node,
+	node->snode = sm_media_session_export_node(impl->session,
 			&node->props->dict,
-			node->adapter, 0);
+			node->adapter);
+	if (node->snode == NULL) {
+		res = -errno;
+		goto clean_node;
+	}
 
 	spa_list_append(&device->node_list, &node->link);
 
@@ -229,15 +244,72 @@ static struct device *bluez5_find_device(struct impl *impl, uint32_t id)
 	return NULL;
 }
 
-static void bluez5_update_device(struct impl *impl, struct device *device,
+static void bluez5_update_device(struct impl *impl, struct device *dev,
 		const struct spa_device_object_info *info)
 {
-	pw_log_debug("update device %u", device->id);
+	pw_log_debug("update device %u", dev->id);
 
 	if (pw_log_level_enabled(SPA_LOG_LEVEL_DEBUG))
 		spa_debug_dict(0, info->props);
+
+	pw_properties_update(dev->props, info->props);
+}
+
+static void set_profile(struct device *device, int index)
+{
+	char buf[1024];
+	struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buf, sizeof(buf));
+
+	pw_log_debug("%p: set profile %d id:%d", device, index, device->device_id);
+
+	device->profile = index;
+	if (device->device_id != 0) {
+		spa_device_set_param(device->device,
+				SPA_PARAM_Profile, 0,
+				spa_pod_builder_add_object(&b,
+					SPA_TYPE_OBJECT_ParamProfile, SPA_PARAM_Profile,
+					SPA_PARAM_PROFILE_index,   SPA_POD_Int(index)));
+	}
+}
+
+static void device_destroy(void *data)
+{
+	struct device *device = data;
+	struct node *node;
+
+	pw_log_debug("device %p destroy", device);
+
+	spa_list_consume(node, &device->node_list, link)
+		bluez5_remove_node(device, node);
+}
+
+static void device_update(void *data)
+{
+	struct device *device = data;
+
+	pw_log_debug("device %p appeared %d %d", device, device->appeared, device->profile);
+
+	if (device->appeared)
+		return;
+
+	device->device_id = device->sdevice->obj.id;
+	device->appeared = true;
+
+	spa_device_add_listener(device->device,
+		&device->device_listener,
+		&bluez5_device_events, device);
+
+	set_profile(device, 1);
+	sm_object_sync_update(&device->sdevice->obj);
 }
 
+static const struct sm_object_events device_events = {
+	SM_VERSION_OBJECT_EVENTS,
+        .destroy = device_destroy,
+        .update = device_update,
+};
+
+
 static struct device *bluez5_create_device(struct impl *impl, uint32_t id,
 		const struct spa_device_object_info *info)
 {
@@ -288,12 +360,12 @@ static struct device *bluez5_create_device(struct impl *impl, uint32_t id,
 
 	spa_list_init(&device->node_list);
 
-	spa_device_add_listener(device->device,
-			&device->device_listener, &bluez5_device_events, device);
 
-	spa_list_append(&impl->device_list, &device->link);
+	sm_object_add_listener(&device->sdevice->obj,
+			&device->listener,
+			&device_events, device);
 
-	bluez5_update_device(impl, device, info);
+	spa_list_append(&impl->device_list, &device->link);
 
 	return device;
 
diff --git a/src/examples/media-session/media-session.c b/src/examples/media-session/media-session.c
index c4edee4e..7991e3b0 100644
--- a/src/examples/media-session/media-session.c
+++ b/src/examples/media-session/media-session.c
@@ -60,15 +60,15 @@
 #define sm_media_session_emit_rescan(s,seq)		sm_media_session_emit(s, rescan, 0, seq)
 #define sm_media_session_emit_destroy(s)		sm_media_session_emit(s, destroy, 0)
 
-int sm_stream_endpoint_start(struct sm_media_session *sess);
 int sm_metadata_start(struct sm_media_session *sess);
 int sm_alsa_midi_start(struct sm_media_session *sess);
 int sm_v4l2_monitor_start(struct sm_media_session *sess);
-int sm_v4l2_endpoint_start(struct sm_media_session *sess);
 int sm_bluez5_monitor_start(struct sm_media_session *sess);
 int sm_alsa_monitor_start(struct sm_media_session *sess);
-int sm_alsa_endpoint_start(struct sm_media_session *sess);
-int sm_policy_ep_start(struct sm_media_session *sess);
+
+int sm_policy_node_start(struct sm_media_session *sess);
+
+int sm_session_manager_start(struct sm_media_session *sess);
 
 /** user data to add to an object */
 struct data {
@@ -90,7 +90,6 @@ struct sync {
 
 struct impl {
 	struct sm_media_session this;
-	uint32_t session_id;
 
 	struct pw_main_loop *loop;
 	struct spa_dbus *dbus;
@@ -110,10 +109,6 @@ struct impl {
 
 	struct spa_hook_list hooks;
 
-	struct pw_client_session *client_session;
-	struct spa_hook proxy_client_session_listener;
-	struct spa_hook client_session_listener;
-
 	struct spa_list endpoint_link_list;	/** list of struct endpoint_link */
 	struct pw_map endpoint_links;		/** map of endpoint_link */
 
@@ -639,7 +634,7 @@ static int session_init(void *object)
 	struct sm_session *sess = object;
 	struct impl *impl = SPA_CONTAINER_OF(sess->obj.session, struct impl, this);
 
-	if (sess->obj.id == impl->session_id)
+	if (sess->obj.id == impl->this.session_id)
 		impl->this.session = sess;
 
 	spa_list_init(&sess->endpoint_list);
@@ -1005,27 +1000,33 @@ static const struct object_info *get_object_info(struct impl *impl, const char *
 }
 
 static struct sm_object *init_object(struct impl *impl, const struct object_info *info,
-		struct pw_proxy *proxy, uint32_t id,
+		struct pw_proxy *proxy, struct pw_proxy *handle, uint32_t id,
 		const struct spa_dict *props)
 {
 	struct sm_object *obj;
 
-	obj = pw_proxy_get_user_data(proxy);
+	obj = pw_proxy_get_user_data(handle);
 	obj->session = &impl->this;
 	obj->id = id;
 	obj->type = info->type;
 	obj->props = props ? pw_properties_new_dict(props) : pw_properties_new(NULL, NULL);
 	obj->proxy = proxy;
+	obj->handle = handle;
 	obj->destroy = info->destroy;
 	obj->mask |= SM_OBJECT_CHANGE_MASK_PROPERTIES | SM_OBJECT_CHANGE_MASK_BIND;
 	obj->avail |= obj->mask;
 	spa_hook_list_init(&obj->hooks);
 	spa_list_init(&obj->data);
 
-	pw_proxy_add_listener(obj->proxy, &obj->proxy_listener, &proxy_events, obj);
-	if (info->events != NULL)
-		pw_proxy_add_object_listener(obj->proxy, &obj->object_listener, info->events, obj);
-	SPA_FLAG_UPDATE(obj->mask, SM_OBJECT_CHANGE_MASK_LISTENER, info->events != NULL);
+	if (proxy) {
+		pw_proxy_add_listener(obj->proxy, &obj->proxy_listener, &proxy_events, obj);
+		if (info->events != NULL)
+			pw_proxy_add_object_listener(obj->proxy, &obj->object_listener, info->events, obj);
+		SPA_FLAG_UPDATE(obj->mask, SM_OBJECT_CHANGE_MASK_LISTENER, info->events != NULL);
+	}
+	if (handle) {
+		pw_proxy_add_listener(obj->handle, &obj->handle_listener, &proxy_events, obj);
+	}
 
 	if (info->init)
 		info->init(obj);
@@ -1037,14 +1038,14 @@ static struct sm_object *init_object(struct impl *impl, const struct object_info
 }
 
 static struct sm_object *
-create_object(struct impl *impl, struct pw_proxy *proxy,
+create_object(struct impl *impl, struct pw_proxy *proxy, struct pw_proxy *handle,
 		const struct spa_dict *props)
 {
 	const char *type;
 	const struct object_info *info;
 	struct sm_object *obj;
 
-	type = pw_proxy_get_type(proxy, NULL);
+	type = pw_proxy_get_type(handle, NULL);
 
 	info = get_object_info(impl, type);
 	if (info == NULL) {
@@ -1052,7 +1053,7 @@ create_object(struct impl *impl, struct pw_proxy *proxy,
 		errno = ENOTSUP;
 		return NULL;
 	}
-	obj = init_object(impl, info, proxy, SPA_ID_INVALID, props);
+	obj = init_object(impl, info, proxy, handle, SPA_ID_INVALID, props);
 
 	pw_log_debug(NAME" %p: created new object %p proxy %p", impl, obj, obj->proxy);
 
@@ -1074,7 +1075,7 @@ bind_object(struct impl *impl, const struct object_info *info, uint32_t id,
 		res = -errno;
 		goto error;
 	}
-	obj = init_object(impl, info, proxy, id, props);
+	obj = init_object(impl, info, proxy, proxy, id, props);
 
 	pw_log_debug(NAME" %p: bound new object %p proxy %p id:%d", impl, obj, obj->proxy, obj->id);
 
@@ -1094,19 +1095,16 @@ update_object(struct impl *impl, const struct object_info *info,
 {
 	pw_properties_update(obj->props, props);
 
-	if (strcmp(obj->type, type) == 0)
+	if (obj->proxy != NULL)
 		return 0;
 
-	pw_log_debug(NAME" %p: update type:%s -> type:%s", impl, obj->type, type);
-	obj->handle = obj->proxy;
-	spa_hook_remove(&obj->proxy_listener);
-	pw_proxy_add_listener(obj->handle, &obj->handle_listener, &proxy_events, obj);
-
-	if (SPA_FLAG_IS_SET(obj->mask, SM_OBJECT_CHANGE_MASK_LISTENER))
-		spa_hook_remove(&obj->object_listener);
+	pw_log_debug(NAME" %p: update type:%s", impl, obj->type);
 
 	obj->proxy = pw_registry_bind(impl->registry,
 			id, info->type, info->version, 0);
+	if (obj->proxy == NULL)
+		return -errno;
+
 	obj->type = info->type;
 
 	pw_proxy_add_listener(obj->proxy, &obj->proxy_listener, &proxy_events, obj);
@@ -1266,19 +1264,36 @@ struct pw_proxy *sm_media_session_export(struct sm_media_session *sess,
 			props, object, user_data_size);
 }
 
+struct sm_node *sm_media_session_export_node(struct sm_media_session *sess,
+		const struct spa_dict *props, struct pw_impl_node *object)
+{
+	struct impl *impl = SPA_CONTAINER_OF(sess, struct impl, this);
+	struct sm_node *node;
+	struct pw_proxy *handle;
+
+	pw_log_debug(NAME " %p: node %p", impl, object);
+
+	handle = pw_core_export(impl->monitor_core, PW_TYPE_INTERFACE_Node,
+			props, object, sizeof(struct sm_node));
+
+	node = (struct sm_node *) create_object(impl, NULL, handle, props);
+
+	return node;
+}
+
 struct sm_device *sm_media_session_export_device(struct sm_media_session *sess,
 		const struct spa_dict *props, struct spa_device *object)
 {
 	struct impl *impl = SPA_CONTAINER_OF(sess, struct impl, this);
 	struct sm_device *device;
-	struct pw_proxy *proxy;
+	struct pw_proxy *handle;
 
 	pw_log_debug(NAME " %p: device %p", impl, object);
 
-	proxy = pw_core_export(impl->monitor_core, SPA_TYPE_INTERFACE_Device,
+	handle = pw_core_export(impl->monitor_core, SPA_TYPE_INTERFACE_Device,
 			props, object, sizeof(struct sm_device));
 
-	device = (struct sm_device *) create_object(impl, proxy, props);
+	device = (struct sm_device *) create_object(impl, NULL, handle, props);
 
 	return device;
 }
@@ -1308,7 +1323,7 @@ struct sm_node *sm_media_session_create_node(struct sm_media_session *sess,
 				props,
 				sizeof(struct sm_node));
 
-	node = (struct sm_node *)create_object(impl, proxy, props);
+	node = (struct sm_node *)create_object(impl, proxy, proxy, props);
 
 	return node;
 }
@@ -1322,7 +1337,7 @@ static void check_endpoint_link(struct endpoint_link *link)
 		spa_list_remove(&link->link);
 		pw_map_remove(&link->impl->endpoint_links, link->id);
 
-		pw_client_session_link_update(link->impl->client_session,
+		pw_client_session_link_update(link->impl->this.client_session,
 				link->id,
 				PW_CLIENT_SESSION_LINK_UPDATE_DESTROYED,
 				0, NULL, NULL);
@@ -1495,7 +1510,7 @@ int sm_media_session_create_links(struct sm_media_session *sess,
 
 	if (link != NULL) {
 		/* now create the endpoint link */
-		pw_client_session_link_update(impl->client_session,
+		pw_client_session_link_update(impl->this.client_session,
 				link->id,
 				PW_CLIENT_SESSION_UPDATE_INFO,
 				0, NULL,
@@ -1504,73 +1519,6 @@ int sm_media_session_create_links(struct sm_media_session *sess,
 	return res;
 }
 
-/**
- * Session implementation
- */
-static int client_session_set_param(void *object, uint32_t id, uint32_t flags,
-			const struct spa_pod *param)
-{
-	struct impl *impl = object;
-	pw_proxy_error((struct pw_proxy*)impl->client_session,
-			-ENOTSUP, "Session:SetParam not supported");
-	return -ENOTSUP;
-}
-
-static int client_session_link_set_param(void *object, uint32_t link_id, uint32_t id, uint32_t flags,
-			const struct spa_pod *param)
-{
-	struct impl *impl = object;
-	pw_proxy_error((struct pw_proxy*)impl->client_session,
-			-ENOTSUP, "Session:LinkSetParam not supported");
-	return -ENOTSUP;
-}
-
-static int client_session_link_request_state(void *object, uint32_t link_id, uint32_t state)
-{
-	return -ENOTSUP;
-}
-
-static const struct pw_client_session_events client_session_events = {
-	PW_VERSION_CLIENT_SESSION_METHODS,
-	.set_param = client_session_set_param,
-	.link_set_param = client_session_link_set_param,
-	.link_request_state = client_session_link_request_state,
-};
-
-static void proxy_client_session_bound(void *data, uint32_t id)
-{
-	struct impl *impl = data;
-	struct pw_session_info info;
-
-	impl->session_id = id;
-
-	spa_zero(info);
-	info.version = PW_VERSION_SESSION_INFO;
-	info.id = id;
-
-	pw_log_debug("got sesssion id:%d", id);
-
-	pw_client_session_update(impl->client_session,
-			PW_CLIENT_SESSION_UPDATE_INFO,
-			0, NULL,
-			&info);
-
-	/* start monitors */
-	sm_metadata_start(&impl->this);
-	sm_alsa_midi_start(&impl->this);
-	sm_bluez5_monitor_start(&impl->this);
-	sm_alsa_monitor_start(&impl->this);
-	sm_alsa_endpoint_start(&impl->this);
-	sm_v4l2_monitor_start(&impl->this);
-	sm_v4l2_endpoint_start(&impl->this);
-	sm_stream_endpoint_start(&impl->this);
-}
-
-static const struct pw_proxy_events proxy_client_session_events = {
-	PW_VERSION_PROXY_EVENTS,
-	.bound = proxy_client_session_bound,
-};
-
 static int start_session(struct impl *impl)
 {
 	impl->monitor_core = pw_context_connect(impl->this.context, NULL, 0);
@@ -1578,21 +1526,6 @@ static int start_session(struct impl *impl)
 		pw_log_error("can't start monitor: %m");
 		return -errno;
 	}
-
-	impl->client_session = pw_core_create_object(impl->monitor_core,
-                                            "client-session",
-                                            PW_TYPE_INTERFACE_ClientSession,
-                                            PW_VERSION_CLIENT_SESSION,
-                                            NULL, 0);
-
-	pw_proxy_add_listener((struct pw_proxy*)impl->client_session,
-			&impl->proxy_client_session_listener,
-			&proxy_client_session_events, impl);
-
-	pw_client_session_add_listener(impl->client_session,
-			&impl->client_session_listener,
-			&client_session_events, impl);
-
 	return 0;
 }
 
@@ -1610,8 +1543,17 @@ static void core_done(void *data, uint32_t id, int seq)
 		}
 	}
 	if (impl->rescan_seq == seq) {
+		struct sm_object *obj, *to;
+
 		pw_log_trace(NAME" %p: rescan %u %d", impl, id, seq);
 		sm_media_session_emit_rescan(impl, seq);
+
+		spa_list_for_each_safe(obj, to, &impl->global_list, link) {
+			pw_log_trace(NAME" %p: obj %p %08x", impl, obj, obj->changed);
+			if (obj->changed)
+				sm_object_emit_update(obj);
+			obj->changed = 0;
+		}
 	}
 }
 
@@ -1668,7 +1610,6 @@ static int start_policy(struct impl *impl)
 			&impl->registry_listener,
 			&registry_events, impl);
 
-	sm_policy_ep_start(&impl->this);
 	return 0;
 }
 
@@ -1685,8 +1626,6 @@ static void session_shutdown(struct impl *impl)
 		pw_proxy_destroy((struct pw_proxy*)impl->registry);
 	if (impl->policy_core)
 		pw_core_disconnect(impl->policy_core);
-	if (impl->client_session)
-		pw_proxy_destroy((struct pw_proxy*)impl->client_session);
 	if (impl->monitor_core)
 		pw_core_disconnect(impl->monitor_core);
 }
@@ -1732,6 +1671,16 @@ int main(int argc, char *argv[])
 	if ((res = start_policy(&impl)) < 0)
 		goto exit;
 
+	sm_metadata_start(&impl.this);
+	sm_alsa_midi_start(&impl.this);
+	sm_bluez5_monitor_start(&impl.this);
+	sm_alsa_monitor_start(&impl.this);
+	sm_v4l2_monitor_start(&impl.this);
+
+	sm_policy_node_start(&impl.this);
+
+//	sm_session_manager_start(&impl.this);
+
 	pw_main_loop_run(impl.loop);
 
 exit:
diff --git a/src/examples/media-session/media-session.h b/src/examples/media-session/media-session.h
index bd673411..50a626fa 100644
--- a/src/examples/media-session/media-session.h
+++ b/src/examples/media-session/media-session.h
@@ -27,6 +27,7 @@
 #define SM_MEDIA_SESSION_H
 
 #include <spa/monitor/device.h>
+#include <pipewire/impl.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -207,6 +208,9 @@ struct sm_media_session_events {
 struct sm_media_session {
 	struct sm_session *session;	/** session object managed by this session */
 
+	uint32_t session_id;
+	struct pw_client_session *client_session;
+
 	struct pw_loop *loop;		/** the main loop */
 	struct pw_context *context;
 
@@ -229,6 +233,8 @@ struct pw_proxy *sm_media_session_export(struct sm_media_session *sess,
 		const char *type, const struct spa_dict *props,
 		void *object, size_t user_data_size);
 
+struct sm_node *sm_media_session_export_node(struct sm_media_session *sess,
+		const struct spa_dict *props, struct pw_impl_node *node);
 struct sm_device *sm_media_session_export_device(struct sm_media_session *sess,
 		const struct spa_dict *props, struct spa_device *device);
 
diff --git a/src/examples/media-session/policy-node.c b/src/examples/media-session/policy-node.c
new file mode 100644
index 00000000..9634bae0
--- /dev/null
+++ b/src/examples/media-session/policy-node.c
@@ -0,0 +1,512 @@
+/* PipeWire
+ *
+ * Copyright © 2019 Wim Taymans
+ *
+ * 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 <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <math.h>
+#include <time.h>
+
+#include "config.h"
+
+#include <spa/node/node.h>
+#include <spa/utils/hook.h>
+#include <spa/param/audio/format-utils.h>
+#include <spa/param/props.h>
+#include <spa/debug/pod.h>
+
+#include "pipewire/pipewire.h"
+
+#include "media-session.h"
+
+#define NAME		"policy-node"
+#define SESSION_KEY	"policy-node"
+
+#define DEFAULT_CHANNELS	2
+#define DEFAULT_SAMPLERATE	48000
+
+#define DEFAULT_IDLE_SECONDS	3
+
+struct impl {
+	struct timespec now;
+
+	struct sm_media_session *session;
+	struct spa_hook listener;
+
+	struct pw_context *context;
+
+	struct spa_list node_list;
+	int seq;
+};
+
+struct node {
+	struct sm_node *obj;
+
+	uint32_t id;
+	struct impl *impl;
+
+	struct spa_list link;		/**< link in impl node_list */
+	enum pw_direction direction;
+
+	struct spa_hook listener;
+
+	uint32_t linked;
+
+	uint32_t client_id;
+	int32_t priority;
+
+#define NODE_TYPE_UNKNOWN	0
+#define NODE_TYPE_STREAM	1
+#define NODE_TYPE_DEVICE	2
+	uint32_t type;
+	char *media;
+
+	struct spa_audio_info format;
+
+	uint64_t plugged;
+	unsigned int active:1;
+	unsigned int exclusive:1;
+	unsigned int enabled:1;
+	unsigned int busy:1;
+};
+
+static int activate_node(struct node *node)
+{
+	struct impl *impl = node->impl;
+	struct sm_param *p;
+	char buf[1024];
+	struct spa_pod_builder b = { 0, };
+	struct spa_pod *param;
+
+	pw_log_debug(NAME" %p: node %p activate", impl, node);
+
+	spa_list_for_each(p, &node->obj->param_list, link) {
+		struct spa_audio_info info = { 0, };
+
+		if (p->id != SPA_PARAM_EnumFormat)
+			continue;
+
+		if (spa_format_parse(p->param, &info.media_type, &info.media_subtype) < 0)
+			continue;
+
+		if (info.media_type != SPA_MEDIA_TYPE_audio ||
+		    info.media_subtype != SPA_MEDIA_SUBTYPE_raw)
+			continue;
+
+		spa_pod_object_fixate((struct spa_pod_object*)p->param);
+		if (pw_log_level_enabled(SPA_LOG_LEVEL_DEBUG))
+			spa_debug_pod(2, NULL, p->param);
+
+		if (spa_format_audio_raw_parse(p->param, &info.info.raw) < 0)
+			continue;
+
+		if (node->format.info.raw.channels < info.info.raw.channels)
+			node->format = info;
+	}
+	node->format.info.raw.rate = 48000;
+
+	spa_pod_builder_init(&b, buf, sizeof(buf));
+	param = spa_format_audio_raw_build(&b, SPA_PARAM_Format, &node->format.info.raw);
+	param = spa_pod_builder_add_object(&b,
+		SPA_TYPE_OBJECT_ParamPortConfig, SPA_PARAM_PortConfig,
+		SPA_PARAM_PORT_CONFIG_direction, SPA_POD_Id(node->direction),
+		SPA_PARAM_PORT_CONFIG_mode,	 SPA_POD_Id(SPA_PARAM_PORT_CONFIG_MODE_dsp),
+		SPA_PARAM_PORT_CONFIG_monitor,   SPA_POD_Bool(true),
+		SPA_PARAM_PORT_CONFIG_format,    SPA_POD_Pod(param));
+
+	if (pw_log_level_enabled(SPA_LOG_LEVEL_DEBUG))
+		spa_debug_pod(2, NULL, param);
+
+	pw_node_set_param((struct pw_node*)node->obj->obj.proxy,
+			SPA_PARAM_PortConfig, 0, param);
+
+	node->active = true;
+	return 0;
+}
+
+static void object_update(void *data)
+{
+	struct node *node = data;
+	struct impl *impl = node->impl;
+
+	pw_log_debug(NAME" %p: node %p %08x", impl, node, node->obj->obj.changed);
+
+	if (node->obj->obj.avail & SM_NODE_CHANGE_MASK_PARAMS &&
+	    !node->active)
+		activate_node(node);
+}
+
+static const struct sm_object_events object_events = {
+	SM_VERSION_OBJECT_EVENTS,
+	.update = object_update
+};
+
+static int
+handle_node(struct impl *impl, struct sm_object *object)
+{
+	const char *str, *media_class;
+	enum pw_direction direction;
+	struct node *node;
+	uint32_t client_id = SPA_ID_INVALID;
+
+	if (object->props) {
+		if ((str = pw_properties_get(object->props, PW_KEY_CLIENT_ID)) != NULL)
+			client_id = atoi(str);
+	}
+
+	media_class = object->props ? pw_properties_get(object->props, PW_KEY_MEDIA_CLASS) : NULL;
+
+	pw_log_debug(NAME" %p: node "PW_KEY_MEDIA_CLASS" %s", impl, media_class);
+
+	if (media_class == NULL)
+		return 0;
+
+	node = sm_object_add_data(object, SESSION_KEY, sizeof(struct node));
+	node->obj = (struct sm_node*)object;
+	node->id = object->id;
+	node->impl = impl;
+	node->client_id = client_id;
+	node->type = NODE_TYPE_UNKNOWN;
+	node->enabled = true;
+	spa_list_append(&impl->node_list, &node->link);
+
+	if (strstr(media_class, "Stream/") == media_class) {
+		media_class += strlen("Stream/");
+
+		if (strstr(media_class, "Output/") == media_class) {
+			direction = PW_DIRECTION_OUTPUT;
+			media_class += strlen("Output/");
+		}
+		else if (strstr(media_class, "Input/") == media_class) {
+			direction = PW_DIRECTION_INPUT;
+			media_class += strlen("Input/");
+		}
+		else
+			return 0;
+
+		node->direction = direction;
+		node->type = NODE_TYPE_STREAM;
+		node->media = strdup(media_class);
+		pw_log_debug(NAME "%p: node %d is stream %s", impl, object->id, node->media);
+	}
+	else {
+		const char *media;
+		if (strstr(media_class, "Audio/") == media_class) {
+			media_class += strlen("Audio/");
+			media = "Audio";
+		}
+		else if (strstr(media_class, "Video/") == media_class) {
+			media_class += strlen("Video/");
+			media = "Video";
+		}
+		else
+			return 0;
+
+		if (strcmp(media_class, "Sink") == 0)
+			direction = PW_DIRECTION_INPUT;
+		else if (strcmp(media_class, "Source") == 0)
+			direction = PW_DIRECTION_OUTPUT;
+		else
+			return 0;
+
+		node->direction = direction;
+		node->type = NODE_TYPE_DEVICE;
+		node->media = strdup(media);
+
+		pw_log_debug(NAME" %p: node %d '%s' prio:%d", impl,
+				object->id, node->media, node->priority);
+	}
+
+	node->obj->obj.mask |= SM_NODE_CHANGE_MASK_PARAMS;
+	sm_object_add_listener(&node->obj->obj, &node->listener, &object_events, node);
+
+	return 1;
+}
+
+static void destroy_node(struct impl *impl, struct node *node)
+{
+	spa_list_remove(&node->link);
+	free(node->media);
+	sm_object_remove_data((struct sm_object*)node->obj, SESSION_KEY);
+}
+
+static void session_create(void *data, struct sm_object *object)
+{
+	struct impl *impl = data;
+	int res;
+
+	if (strcmp(object->type, PW_TYPE_INTERFACE_Node) == 0)
+		res = handle_node(impl, object);
+	else
+		res = 0;
+
+	if (res < 0) {
+		pw_log_warn(NAME" %p: can't handle global %d", impl, object->id);
+	}
+	else
+		sm_media_session_schedule_rescan(impl->session);
+}
+
+static void session_remove(void *data, struct sm_object *object)
+{
+	struct impl *impl = data;
+	pw_log_debug(NAME " %p: remove global '%d'", impl, object->id);
+
+	if (strcmp(object->type, PW_TYPE_INTERFACE_Node) == 0) {
+		struct node *node;
+		if ((node = sm_object_get_data(object, SESSION_KEY)) != NULL)
+			destroy_node(impl, node);
+	}
+
+	sm_media_session_schedule_rescan(impl->session);
+}
+
+struct find_data {
+	struct impl *impl;
+	struct node *target;
+	struct node *node;
+	bool exclusive;
+	int priority;
+	uint64_t plugged;
+};
+
+static int find_node(void *data, struct node *node)
+{
+	struct find_data *find = data;
+	struct impl *impl = find->impl;
+	int priority = 0;
+	uint64_t plugged = 0;
+
+	pw_log_debug(NAME " %p: looking at node '%d' enabled:%d busy:%d exclusive:%d",
+			impl, node->id, node->enabled, node->busy, node->exclusive);
+
+	if (!node->enabled || node->type == NODE_TYPE_UNKNOWN)
+		return 0;
+
+	if (node->direction == find->target->direction) {
+		pw_log_debug(".. same direction");
+		return 0;
+	}
+	if (strcmp(node->media, find->target->media) != 0) {
+		pw_log_debug(".. incompatible media %s <-> %s", node->media, find->target->media);
+		return 0;
+	}
+
+	plugged = node->plugged;
+	priority = node->priority;
+
+	if ((find->exclusive && node->busy) || node->exclusive) {
+		pw_log_debug(NAME " %p: node '%d' in use", impl, node->id);
+		return 0;
+	}
+
+	pw_log_debug(NAME " %p: found node '%d' %"PRIu64" prio:%d", impl,
+			node->id, plugged, priority);
+
+	if (find->node == NULL ||
+	    priority > find->priority ||
+	    (priority == find->priority && plugged > find->plugged)) {
+		pw_log_debug(NAME " %p: new best %d %" PRIu64, impl, priority, plugged);
+		find->node = node;
+		find->priority = priority;
+		find->plugged = plugged;
+	}
+	return 0;
+}
+
+static int link_nodes(struct node *node, struct node *peer)
+{
+	struct impl *impl = node->impl;
+	struct pw_properties *props;
+
+	pw_log_debug(NAME " %p: link nodes %d %d", impl, node->id, peer->id);
+
+	if (node->direction == PW_DIRECTION_INPUT) {
+		struct node *t = node;
+		node = peer;
+		peer = t;
+	}
+	props = pw_properties_new(NULL, NULL);
+	pw_properties_setf(props, PW_KEY_LINK_OUTPUT_NODE, "%d", node->id);
+	pw_properties_setf(props, PW_KEY_LINK_INPUT_NODE, "%d", peer->id);
+	pw_log_debug(NAME " %p: node %d -> node %d", impl,
+			node->id, peer->id);
+
+	sm_media_session_create_links(impl->session, &props->dict);
+
+	pw_properties_free(props);
+
+	node->linked++;
+	peer->linked++;
+
+	return 0;
+}
+
+static int rescan_node(struct impl *impl, struct node *n)
+{
+	struct spa_dict *props;
+        const char *str;
+        bool exclusive;
+        struct find_data find;
+	struct pw_node_info *info;
+	struct node *peer;
+	struct sm_object *obj;
+
+	if (n->type == NODE_TYPE_DEVICE)
+		return 0;
+
+	if (!n->active)
+		return 0;
+
+	if (n->obj->info == NULL || n->obj->info->props == NULL) {
+		pw_log_debug(NAME " %p: node %d has no properties", impl, n->id);
+		return 0;
+	}
+
+	if (n->linked > 0) {
+		pw_log_debug(NAME " %p: node %d is already linked", impl, n->id);
+		return 0;
+	}
+
+	info = n->obj->info;
+	props = info->props;
+
+        str = spa_dict_lookup(props, PW_KEY_NODE_AUTOCONNECT);
+        if (str == NULL || !pw_properties_parse_bool(str)) {
+		pw_log_debug(NAME" %p: node %d does not need autoconnect", impl, n->id);
+                return 0;
+	}
+
+	if (n->media == NULL) {
+		pw_log_debug(NAME" %p: node %d has unknown media", impl, n->id);
+		return 0;
+	}
+
+	spa_zero(find);
+
+	if ((str = spa_dict_lookup(props, PW_KEY_NODE_EXCLUSIVE)) != NULL)
+		exclusive = pw_properties_parse_bool(str);
+	else
+		exclusive = false;
+
+	find.impl = impl;
+	find.target = n;
+	find.exclusive = exclusive;
+
+	pw_log_info(NAME " %p: exclusive:%d", impl, exclusive);
+
+	str = spa_dict_lookup(props, PW_KEY_NODE_TARGET);
+	if (str != NULL) {
+		uint32_t path_id = atoi(str);
+		pw_log_info(NAME " %p: target:%d", impl, path_id);
+
+		if ((obj = sm_media_session_find_object(impl->session, path_id)) != NULL) {
+			if (strcmp(obj->type, PW_TYPE_INTERFACE_Node) == 0) {
+				peer = sm_object_get_data(obj, SESSION_KEY);
+				goto do_link;
+			}
+		}
+	}
+
+	spa_list_for_each(peer, &impl->node_list, link)
+		find_node(&find, peer);
+
+	if (find.node == NULL) {
+		struct sm_object *obj;
+
+		pw_log_warn(NAME " %p: no node found for %d", impl, n->id);
+
+		str = spa_dict_lookup(props, PW_KEY_NODE_DONT_RECONNECT);
+		if (str != NULL && pw_properties_parse_bool(str)) {
+//			pw_registry_destroy(impl->registry, n->id);
+		}
+
+		obj = sm_media_session_find_object(impl->session, n->client_id);
+		if (obj && strcmp(obj->type, PW_TYPE_INTERFACE_Client) == 0) {
+			pw_client_error((struct pw_client*)obj->proxy,
+				n->id, -ENOENT, "no node available");
+		}
+		return -ENOENT;
+	}
+	peer = find.node;
+
+	if (exclusive && peer->busy) {
+		pw_log_warn(NAME" %p: node %d busy, can't get exclusive access", impl, peer->id);
+		return -EBUSY;
+	}
+	peer->exclusive = exclusive;
+
+	pw_log_debug(NAME" %p: linking to node '%d'", impl, peer->id);
+
+        peer->busy = true;
+
+do_link:
+	link_nodes(n, peer);
+        return 1;
+}
+
+static void session_rescan(void *data, int seq)
+{
+	struct impl *impl = data;
+	struct node *node;
+
+	clock_gettime(CLOCK_MONOTONIC, &impl->now);
+	pw_log_debug(NAME" %p: rescan", impl);
+
+	spa_list_for_each(node, &impl->node_list, link)
+		rescan_node(impl, node);
+}
+
+static void session_destroy(void *data)
+{
+	struct impl *impl = data;
+	spa_hook_remove(&impl->listener);
+	free(impl);
+}
+
+static const struct sm_media_session_events session_events = {
+	SM_VERSION_MEDIA_SESSION_EVENTS,
+	.create = session_create,
+	.remove = session_remove,
+	.rescan = session_rescan,
+	.destroy = session_destroy,
+};
+
+int sm_policy_node_start(struct sm_media_session *session)
+{
+	struct impl *impl;
+
+	impl = calloc(1, sizeof(struct impl));
+	if (impl == NULL)
+		return -errno;
+
+	impl->session = session;
+	impl->context = session->context;
+
+	spa_list_init(&impl->node_list);
+
+	sm_media_session_add_listener(impl->session, &impl->listener, &session_events, impl);
+
+	return 0;
+}
diff --git a/src/examples/media-session/session-manager.c b/src/examples/media-session/session-manager.c
new file mode 100644
index 00000000..18604fa9
--- /dev/null
+++ b/src/examples/media-session/session-manager.c
@@ -0,0 +1,170 @@
+/* PipeWire
+ *
+ * Copyright © 2020 Wim Taymans
+ *
+ * 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 <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <math.h>
+#include <time.h>
+
+#include "config.h"
+
+#include <spa/node/node.h>
+#include <spa/utils/hook.h>
+#include <spa/param/audio/format-utils.h>
+#include <spa/param/props.h>
+#include <spa/debug/pod.h>
+
+#include "pipewire/pipewire.h"
+#include "extensions/session-manager.h"
+
+#include "media-session.h"
+
+#define NAME		"session-manager"
+#define SESSION_KEY	"session-manager"
+
+int sm_stream_endpoint_start(struct sm_media_session *sess);
+int sm_v4l2_endpoint_start(struct sm_media_session *sess);
+int sm_bluez5_endpoint_start(struct sm_media_session *sess);
+int sm_alsa_endpoint_start(struct sm_media_session *sess);
+int sm_policy_ep_start(struct sm_media_session *sess);
+
+struct impl {
+	struct timespec now;
+
+	struct sm_media_session *session;
+	struct spa_hook listener;
+
+	struct pw_context *context;
+
+	struct spa_hook proxy_client_session_listener;
+	struct spa_hook client_session_listener;
+};
+
+/**
+ * Session implementation
+ */
+static int client_session_set_param(void *object, uint32_t id, uint32_t flags,
+			const struct spa_pod *param)
+{
+	struct impl *impl = object;
+	pw_proxy_error((struct pw_proxy*)impl->session->client_session,
+			-ENOTSUP, "Session:SetParam not supported");
+	return -ENOTSUP;
+}
+
+static int client_session_link_set_param(void *object, uint32_t link_id, uint32_t id, uint32_t flags,
+			const struct spa_pod *param)
+{
+	struct impl *impl = object;
+	pw_proxy_error((struct pw_proxy*)impl->session->client_session,
+			-ENOTSUP, "Session:LinkSetParam not supported");
+	return -ENOTSUP;
+}
+
+static int client_session_link_request_state(void *object, uint32_t link_id, uint32_t state)
+{
+	return -ENOTSUP;
+}
+
+static const struct pw_client_session_events client_session_events = {
+	PW_VERSION_CLIENT_SESSION_METHODS,
+	.set_param = client_session_set_param,
+	.link_set_param = client_session_link_set_param,
+	.link_request_state = client_session_link_request_state,
+};
+
+static void proxy_client_session_bound(void *data, uint32_t id)
+{
+	struct impl *impl = data;
+	struct pw_session_info info;
+
+	impl->session->session_id = id;
+
+	spa_zero(info);
+	info.version = PW_VERSION_SESSION_INFO;
+	info.id = id;
+
+	pw_log_debug("got sesssion id:%d", id);
+
+	pw_client_session_update(impl->session->client_session,
+			PW_CLIENT_SESSION_UPDATE_INFO,
+			0, NULL,
+			&info);
+
+	/* start endpoints */
+	sm_bluez5_endpoint_start(impl->session);
+	sm_alsa_endpoint_start(impl->session);
+	sm_v4l2_endpoint_start(impl->session);
+	sm_stream_endpoint_start(impl->session);
+
+	sm_policy_ep_start(impl->session);
+}
+
+static const struct pw_proxy_events proxy_client_session_events = {
+	PW_VERSION_PROXY_EVENTS,
+	.bound = proxy_client_session_bound,
+};
+
+static void session_destroy(void *data)
+{
+	struct impl *impl = data;
+	spa_hook_remove(&impl->listener);
+	free(impl);
+}
+
+static const struct sm_media_session_events session_events = {
+	SM_VERSION_MEDIA_SESSION_EVENTS,
+	.destroy = session_destroy,
+};
+
+int sm_session_manager_start(struct sm_media_session *session)
+{
+	struct impl *impl;
+
+	impl = calloc(1, sizeof(struct impl));
+	if (impl == NULL)
+		return -errno;
+
+	impl->session = session;
+	impl->context = session->context;
+	sm_media_session_add_listener(impl->session, &impl->listener, &session_events, impl);
+
+	session->client_session = (struct pw_client_session *)
+		sm_media_session_create_object(impl->session,
+                                            "client-session",
+                                            PW_TYPE_INTERFACE_ClientSession,
+                                            PW_VERSION_CLIENT_SESSION,
+                                            NULL, 0);
+
+	pw_proxy_add_listener((struct pw_proxy*)session->client_session,
+			&impl->proxy_client_session_listener,
+			&proxy_client_session_events, impl);
+
+	pw_client_session_add_listener(session->client_session,
+			&impl->client_session_listener,
+			&client_session_events, impl);
+
+	return 0;
+}
diff --git a/src/examples/meson.build b/src/examples/meson.build
index 42cfc73d..c7973512 100644
--- a/src/examples/meson.build
+++ b/src/examples/meson.build
@@ -49,10 +49,13 @@ executable('media-session',
   'media-session/alsa-monitor.c',
   'media-session/alsa-endpoint.c',
   'media-session/bluez-monitor.c',
+  'media-session/bluez-endpoint.c',
   'media-session/media-session.c',
+  'media-session/session-manager.c',
   'media-session/metadata.c',
   'media-session/stream-endpoint.c',
   'media-session/policy-ep.c',
+  'media-session/policy-node.c',
   'media-session/v4l2-monitor.c',
   'media-session/v4l2-endpoint.c',
   c_args : [ '-D_GNU_SOURCE' ],
diff --git a/src/pipewire/impl-device.c b/src/pipewire/impl-device.c
index 1c285549..65cd5c20 100644
--- a/src/pipewire/impl-device.c
+++ b/src/pipewire/impl-device.c
@@ -318,16 +318,44 @@ static int device_enum_params(void *object, int seq, uint32_t id, uint32_t start
 	return res;
 }
 
+static void result_device_done(void *data, int seq, int res, uint32_t type, const void *result)
+{
+	struct resource_data *d = data;
+
+	pw_log_debug(NAME" %p: async result %d %d (%d/%d)", d->device,
+			res, seq, d->seq, d->end);
+
+	if (seq == d->end) {
+		spa_hook_remove(&d->listener);
+		d->end = -1;
+		pw_impl_client_set_busy(d->resource->client, false);
+	}
+}
+
 static int device_set_param(void *object, uint32_t id, uint32_t flags,
                            const struct spa_pod *param)
 {
 	struct resource_data *data = object;
 	struct pw_resource *resource = data->resource;
 	struct pw_impl_device *device = data->device;
+	struct pw_impl_client *client = resource->client;
 	int res;
+	static const struct spa_device_events device_events = {
+		SPA_VERSION_DEVICE_EVENTS,
+		.result = result_device_done,
+	};
 
-	if ((res = spa_device_set_param(device->device, id, flags, param)) < 0)
+	if ((res = spa_device_set_param(device->device, id, flags, param)) < 0) {
 		pw_resource_error(resource, res, spa_strerror(res));
+	} else if (SPA_RESULT_IS_ASYNC(res)) {
+		pw_impl_client_set_busy(client, true);
+		data->data.data = data;
+		if (data->end == -1)
+			spa_device_add_listener(device->device, &data->listener,
+				&device_events, data);
+		data->seq = res;
+		data->end = spa_device_sync(device->device, res);
+	}
 	return res;
 }