refactor some video code

src/include/switch_rtp.h

@@ -139,6 +139,7 @@ SWITCH_DECLARE(void) switch_rtp_shutdown(void);
 SWITCH_DECLARE(switch_port_t) switch_rtp_set_start_port(switch_port_t port);
 
 SWITCH_DECLARE(switch_status_t) switch_rtp_set_ssrc(switch_rtp_t *rtp_session, uint32_t ssrc);
+SWITCH_DECLARE(switch_status_t) switch_rtp_set_remote_ssrc(switch_rtp_t *rtp_session, uint32_t ssrc);
 
 /*!
   \brief Set/Get RTP end port

src/include/switch_types.h

@@ -1326,6 +1326,7 @@ typedef enum {
 	CF_DTLS_OK,
 	CF_VIDEO_PASSIVE,
 	CF_NOVIDEO,
+	CF_VIDEO_ECHO,
 	/* WARNING: DO NOT ADD ANY FLAGS BELOW THIS LINE */
 	/* IF YOU ADD NEW ONES CHECK IF THEY SHOULD PERSIST OR ZERO THEM IN switch_core_session.c switch_core_session_request_xml() */
 	CF_FLAG_MAX