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policy-node: implement move node

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Move nodes to a new target when the metadata changes.
This commit is contained in:
Wim Taymans 2020-07-20 14:40:50 +02:00
parent ff876bf58e
commit 7915bf5778
1 changed files with 55 additions and 3 deletions
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58
src/examples/media-session/policy-node.c
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@ -421,7 +421,7 @@ static int link_nodes(struct node *node, struct node *peer)
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_info("linking node %d -> node %d", node->id, peer->id);
pw_log_info("linking node %d to node %d", node->id, peer->id);
sm_media_session_create_links(impl->session, &props->dict);
@ -449,7 +449,7 @@ static int unlink_nodes(struct node *node, struct node *peer)
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_info("unlinking node %d -> node %d", node->id, peer->id);
pw_log_info("unlinking node %d from peer node %d", node->id, peer->id);
sm_media_session_remove_links(impl->session, &props->dict);
@ -619,6 +619,16 @@ static const struct sm_media_session_events session_events = {
.destroy = session_destroy,
};
static struct node *find_node_by_id(struct impl *impl, uint32_t id)
{
struct node *node;
spa_list_for_each(node, &impl->node_list, link) {
if (node->id == id)
return node;
}
return NULL;
}
static struct node *find_node_by_name(struct impl *impl, const char *name)
{
const char *str;
@ -646,7 +656,7 @@ static int move_node(struct impl *impl, const char *source, const char *target)
if (src_node == dst_node)
return 0;
pw_log_info("move %d -> %d", src_node->obj->obj.id, dst_node->obj->obj.id);
pw_log_info("move %d -> %d", src_node->id, dst_node->id);
/* unlink all nodes from source and link to target */
spa_list_for_each(n, &impl->node_list, link) {
@ -668,11 +678,39 @@ static int move_node(struct impl *impl, const char *source, const char *target)
return 0;
}
static int handle_move(struct impl *impl, struct node *src_node, struct node *dst_node)
{
const char *str;
struct pw_node_info *info;
if ((info = src_node->obj->info) == NULL)
return -EIO;
if ((str = spa_dict_lookup(info->props, PW_KEY_NODE_DONT_RECONNECT)) != NULL &&
pw_properties_parse_bool(str)) {
pw_log_warn("can't reconnect node %d to %d", src_node->id,
dst_node->id);
return -EPERM;
}
pw_log_info("move node %d: from peer %d to %d", src_node->id,
src_node->peer ? src_node->peer->id : SPA_ID_INVALID,
dst_node->id);
if (src_node->peer)
unlink_nodes(src_node, src_node->peer);
link_nodes(src_node, dst_node);
return 0;
}
static int metadata_property(void *object, uint32_t subject,
const char *key, const char *type, const char *value)
{
struct impl *impl = object;
if (key == NULL || type == NULL)
return 0;
if (subject == PW_ID_CORE) {
if (strcmp(key, "default.audio.sink.name") == 0) {
if (impl->default_audio_sink && value)
@ -686,7 +724,21 @@ static int metadata_property(void *object, uint32_t subject,
free(impl->default_audio_source);
impl->default_audio_source = value ? strdup(value) : NULL;
}
} else {
struct node *src_node, *dst_node = NULL;
src_node = find_node_by_id(impl, subject);
if (strcmp(key, "target.node") == 0 && value != NULL) {
dst_node = find_node_by_id(impl, atoi(value));
}
else if (strcmp(key, "target.node.name") == 0 && value != NULL) {
dst_node = find_node_by_name(impl, value);
}
if (src_node && dst_node)
handle_move(impl, src_node, dst_node);
}
return 0;
}