res_stasis.c: Add new type 'sdp_label' for bridge creation.

Add new type 'sdp_label' when creating a bridge using the ARI. This will
add labels to the SDP for each stream, the label is set to the
corresponding channel id.

Resolves: #91

UserNote: When creating a bridge using the ARI the 'type' argument now
accepts a new value 'sdp_label' which will configure the bridge to add
labels for each stream in the SDP with the corresponding channel id.

res/ari/resource_bridges.h

@@ -52,7 +52,7 @@ struct ast_ari_bridges_list_args {
 void ast_ari_bridges_list(struct ast_variable *headers, struct ast_ari_bridges_list_args *args, struct ast_ari_response *response);
 /*! Argument struct for ast_ari_bridges_create() */
 struct ast_ari_bridges_create_args {
-	/*! Comma separated list of bridge type attributes (mixing, holding, dtmf_events, proxy_media, video_sfu, video_single). */
+	/*! Comma separated list of bridge type attributes (mixing, holding, dtmf_events, proxy_media, video_sfu, video_single, sdp_label). */
 	const char *type;
 	/*! Unique ID to give to the bridge being created. */
 	const char *bridge_id;
@@ -82,7 +82,7 @@ int ast_ari_bridges_create_parse_body(
 void ast_ari_bridges_create(struct ast_variable *headers, struct ast_ari_bridges_create_args *args, struct ast_ari_response *response);
 /*! Argument struct for ast_ari_bridges_create_with_id() */
 struct ast_ari_bridges_create_with_id_args {
-	/*! Comma separated list of bridge type attributes (mixing, holding, dtmf_events, proxy_media, video_sfu, video_single) to set. */
+	/*! Comma separated list of bridge type attributes (mixing, holding, dtmf_events, proxy_media, video_sfu, video_single, sdp_label) to set. */
 	const char *type;
 	/*! Unique ID to give to the bridge being created. */
 	const char *bridge_id;

res/res_stasis.c

@@ -801,6 +801,7 @@ static struct ast_bridge *bridge_create_common(const char *type, const char *nam
 		| AST_BRIDGE_FLAG_SWAP_INHIBIT_FROM | AST_BRIDGE_FLAG_SWAP_INHIBIT_TO
 		| AST_BRIDGE_FLAG_TRANSFER_BRIDGE_ONLY;
 	enum ast_bridge_video_mode_type video_mode = AST_BRIDGE_VIDEO_MODE_TALKER_SRC;
+	int send_sdp_label = 0;
 
 	if (invisible) {
 		flags |= AST_BRIDGE_FLAG_INVISIBLE;
@@ -821,6 +822,8 @@ static struct ast_bridge *bridge_create_common(const char *type, const char *nam
 			video_mode = AST_BRIDGE_VIDEO_MODE_SFU;
 		} else if (!strcmp(requested_type, "video_single")) {
 			video_mode = AST_BRIDGE_VIDEO_MODE_SINGLE_SRC;
+		} else if (!strcmp(requested_type, "sdp_label")) {
+			send_sdp_label = 1;
 		}
 	}
 
@@ -837,7 +840,7 @@ static struct ast_bridge *bridge_create_common(const char *type, const char *nam
 		return NULL;
 	}
 
-	bridge = bridge_stasis_new(capabilities, flags, name, id, video_mode);
+	bridge = bridge_stasis_new(capabilities, flags, name, id, video_mode, send_sdp_label);
 	if (bridge) {
 		if (!ao2_link(app_bridges, bridge)) {
 			ast_bridge_destroy(bridge, 0);

res/stasis/stasis_bridge.c

@@ -295,7 +295,7 @@ static void bridge_stasis_pull(struct ast_bridge *self, struct ast_bridge_channe
 	ast_bridge_base_v_table.pull(self, bridge_channel);
 }
 
-struct ast_bridge *bridge_stasis_new(uint32_t capabilities, unsigned int flags, const char *name, const char *id, enum ast_bridge_video_mode_type video_mode)
+struct ast_bridge *bridge_stasis_new(uint32_t capabilities, unsigned int flags, const char *name, const char *id, enum ast_bridge_video_mode_type video_mode, unsigned int send_sdp_label)
 {
 	void *bridge;
 
@@ -317,6 +317,10 @@ struct ast_bridge *bridge_stasis_new(uint32_t capabilities, unsigned int flags,
 		ast_bridge_set_talker_src_video_mode(bridge);
 	}
 
+	if (send_sdp_label) {
+		ast_bridge_set_send_sdp_label(bridge, 1);
+	}
+
 	bridge = bridge_register(bridge);
 
 	return bridge;

res/stasis/stasis_bridge.h

@@ -55,7 +55,7 @@ extern "C" {
  * \retval a pointer to a new bridge on success
  * \retval NULL on failure
  */
-struct ast_bridge *bridge_stasis_new(uint32_t capabilities, unsigned int flags, const char *name, const char *id, enum ast_bridge_video_mode_type video_mode);
+struct ast_bridge *bridge_stasis_new(uint32_t capabilities, unsigned int flags, const char *name, const char *id, enum ast_bridge_video_mode_type video_mode, unsigned int send_sdp_label);
 
 /*!
  * \internal

rest-api/api-docs/bridges.json

@@ -30,7 +30,7 @@
 					"parameters": [
 						{
 							"name": "type",
-							"description": "Comma separated list of bridge type attributes (mixing, holding, dtmf_events, proxy_media, video_sfu, video_single).",
+							"description": "Comma separated list of bridge type attributes (mixing, holding, dtmf_events, proxy_media, video_sfu, video_single, sdp_label).",
 							"paramType": "query",
 							"required": false,
 							"allowMultiple": false,
@@ -69,7 +69,7 @@
 					"parameters": [
 						{
 							"name": "type",
-							"description": "Comma separated list of bridge type attributes (mixing, holding, dtmf_events, proxy_media, video_sfu, video_single) to set.",
+							"description": "Comma separated list of bridge type attributes (mixing, holding, dtmf_events, proxy_media, video_sfu, video_single, sdp_label) to set.",
 							"paramType": "query",
 							"required": false,
 							"allowMultiple": false,