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

1 files changed, 512 insertions, 0 deletions

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;
+}