FS-7513: add code to track media direction to avoid assigning floor or video layers to those with no signal

src/include/switch_core_media.h

@@ -323,6 +323,7 @@ SWITCH_DECLARE(switch_status_t) switch_core_media_read_lock_unlock(switch_core_s
 #define switch_core_media_read_unlock(_s, _t) switch_core_media_read_lock_unlock(_s, _t, SWITCH_FALSE)
 
 SWITCH_DECLARE(void) switch_core_session_stop_media(switch_core_session_t *session);
+SWITCH_DECLARE(switch_media_flow_t) switch_core_session_media_flow(switch_core_session_t *session, switch_media_type_t type);
 
 SWITCH_END_EXTERN_C
 #endif

src/include/switch_types.h

@@ -2475,6 +2475,13 @@ typedef struct payload_map_s {
 
 } payload_map_t;
 
+typedef enum {
+	SWITCH_MEDIA_FLOW_SENDRECV = 0,
+	SWITCH_MEDIA_FLOW_SENDONLY,
+	SWITCH_MEDIA_FLOW_RECVONLY,
+	SWITCH_MEDIA_FLOW_INACTIVE
+} switch_media_flow_t;
+
 typedef enum {
 	ICE_GOOGLE_JINGLE = (1 << 0),
 	ICE_VANILLA = (1 << 1),