add new flag to frames to denote pass thru frames that are not audio

src/include/switch_types.h

@@ -1203,7 +1203,8 @@ typedef enum {
 	SFF_PROXY_PACKET = (1 << 5),
 	SFF_DYNAMIC = (1 << 6),
 	SFF_ZRTP = (1 << 7),
-	SFF_UDPTL_PACKET = (1 << 8)
+	SFF_UDPTL_PACKET = (1 << 8),
+	SFF_NOT_AUDIO = (1 << 9)
 } switch_frame_flag_enum_t;
 typedef uint32_t switch_frame_flag_t;
 

src/switch_core_io.c

@@ -265,6 +265,13 @@ SWITCH_DECLARE(switch_status_t) switch_core_session_read_frame(switch_core_sessi
 		do_bugs = 1;
 		need_codec = 1;
 	}
+	
+	if (((*frame)->flags & SFF_NOT_AUDIO)) {
+		do_resample = 0;
+		do_bugs = 0;
+		need_codec = 0;
+	}
+
 
 	if (switch_test_flag(session, SSF_READ_TRANSCODE) && !need_codec && switch_core_codec_ready(session->read_codec)) {
 		switch_core_session_t *other_session;
@@ -792,6 +799,13 @@ SWITCH_DECLARE(switch_status_t) switch_core_session_write_frame(switch_core_sess
 		do_resample = TRUE;
 	}
 
+
+	if ((frame->flags & SFF_NOT_AUDIO)) {
+		do_resample = 0;
+		do_bugs = 0;
+		need_codec = 0;
+	}
+
 	if (switch_test_flag(session, SSF_WRITE_TRANSCODE) && !need_codec && switch_core_codec_ready(session->write_codec)) {
 		switch_core_session_t *other_session;
 		const char *uuid = switch_channel_get_variable(switch_core_session_get_channel(session), SWITCH_SIGNAL_BOND_VARIABLE);

src/switch_rtp.c

@@ -3131,6 +3131,11 @@ static int rtp_common_read(switch_rtp_t *rtp_session, switch_payload_t *payload_
 			}
 		}
 
+		if (((rtp_session->cng_pt && rtp_session->recv_msg.header.pt == rtp_session->cng_pt) || rtp_session->recv_msg.header.pt == 13)) {
+			*flags |= SFF_NOT_AUDIO;
+		}
+
+
 		/* ignore packets not meant for us unless the auto-adjust window is open */
 		if (bytes) {
 			if (switch_test_flag(rtp_session, SWITCH_RTP_FLAG_AUTOADJ)) {