TT#14008 always add a=mid to media section

closes #1361

Change-Id: I8c3dfb54f47f0cfeb913f27b240eed55e2ca8154

daemon/sdp.c

@@ -2574,13 +2574,13 @@ static struct packet_stream *print_sdp_media_section(GString *s, struct call_med
 {
 	struct packet_stream *ps_rtcp = NULL;
 
-	if (is_active) {
-		if (media->media_id.s) {
-			g_string_append(s, "a=mid:");
-			g_string_append_printf(s, STR_FORMAT, STR_FMT(&media->media_id));
-			g_string_append(s, "\r\n");
-		}
+	if (media->media_id.s) {
+		g_string_append(s, "a=mid:");
+		g_string_append_printf(s, STR_FORMAT, STR_FMT(&media->media_id));
+		g_string_append(s, "\r\n");
+	}
 
+	if (is_active) {
 		if (proto_is_rtp(media->protocol))
 			insert_codec_parameters(s, media);
 

t/auto-daemon-tests.pl

@@ -40,6 +40,37 @@ my ($sock_a, $sock_b, $sock_c, $sock_d, $port_a, $port_b, $ssrc, $ssrc_b, $resp,
 
 
 
+new_call;
+
+offer('a=mid on zero streams', { }, <<SDP);
+v=0
+o=- 1545997027 1 IN IP4 198.51.100.1
+s=tester
+t=0 0
+m=audio 2000 RTP/AVP 0
+c=IN IP4 198.51.100.14
+a=sendrecv
+a=mid:0
+m=audio 0 RTP/AVP 0
+c=IN IP4 198.51.100.14
+a=sendrecv
+a=mid:1
+----------------------------------
+v=0
+o=- 1545997027 1 IN IP4 198.51.100.1
+s=tester
+t=0 0
+m=audio PORT RTP/AVP 0
+c=IN IP4 203.0.113.1
+a=mid:0
+a=rtpmap:0 PCMU/8000
+a=sendrecv
+a=rtcp:PORT
+m=audio PORT RTP/AVP 0
+c=IN IP4 203.0.113.1
+a=mid:1
+SDP
+
 new_call;
 my $ft1 = ft();