MT#55283 parse a=label

This is needed to correctly print media labels for SIPREC in case the
input SDPs already had media labels.

Change-Id: I021f44ba28a3648ceb62db12425ddf545de42a96
(cherry picked from commit 9a65ab0335)

daemon/call.c

@@ -2861,6 +2861,15 @@ static void __update_media_label(struct call_media *media, sdp_ng_flags *flags,
 	media->label = call_str_cpy_c(buf);
 }
 
+__attribute__((nonnull(1, 2)))
+static void media_update_label(struct call_media *media, sdp_ng_flags *flags, const str *label)
+{
+	if (flags->siprec) // we generate our own
+		return;
+
+	media->label = call_str_cpy(label);
+}
+
 // `media` can be NULL
 __attribute__((nonnull(1, 3, 4)))
 static void __media_init_from_flags(struct call_media *other_media, struct call_media *media,
@@ -2923,8 +2932,10 @@ static void __media_init_from_flags(struct call_media *other_media, struct call_
 			break;
 	}
 
-	if (media)
+	if (media) {
 		__update_media_label(media, flags, other_media->unique_id);
+		media_update_label(media, flags, &sp->label);
+	}
 	__update_media_protocol(media, other_media, sp, flags);
 	__update_media_id(media, other_media, sp, flags);
 	__endpoint_loop_protect(sp, other_media);

daemon/sdp.c

@@ -66,6 +66,7 @@ enum attr_id {
 	ATTR_TLS_ID,
 	ATTR_END_OF_CANDIDATES,
 	ATTR_MOH_ATTR_NAME,
+	ATTR_LABEL,
 };
 // make sure g_direct_hash can be used
 static_assert(sizeof(void *) >= sizeof(enum attr_id), "sizeof enum attr_id wrong");
@@ -1219,6 +1220,9 @@ static int parse_attribute(struct sdp_attribute *a) {
 		case CSH_LOOKUP("maxptime"):
 			a->attr = ATTR_MAXPTIME;
 			break;
+		case CSH_LOOKUP("label"):
+			a->attr = ATTR_LABEL;
+			break;
 		default:
 			/* check moh-attr-name (can be a variable attribute value) */
 			if (rtpe_config.moh_attr_name && !str_cmp(&a->strs.name, rtpe_config.moh_attr_name))
@@ -2002,6 +2006,11 @@ int sdp_streams(const sdp_sessions_q *sessions, sdp_streams_q *streams, sdp_ng_f
 			if (attr)
 				sp->media_id = attr->strs.value;
 
+			// a=label
+			attr = attr_get_by_id(&media->attributes, ATTR_LABEL);
+			if (attr)
+				sp->label = attr->strs.value;
+
 			// be ignorant about the contents
 			if (attr_get_by_id(&media->attributes, ATTR_RTCP_FB))
 				SP_SET(sp, RTCP_FB);
@@ -2717,7 +2726,7 @@ static void print_sdp_media_section(GString *s, struct call_media *media,
 	/* mid and label must be added even for inactive streams (see #1361 and #1362). */
 	if (media->media_id.s)
 		append_attr_to_gstring(s, "mid", &media->media_id, flags, media->type_id);
-	if (media->label.len && flags->siprec)
+	if (media->label.len)
 		append_attr_to_gstring(s, "label", &media->label, flags, media->type_id);
 
 	/* nothing more to be printed for inactive stream (non-accepted media session) */

include/call.h

@@ -378,6 +378,7 @@ struct stream_params {
 	int			media_sdp_id;
 	struct session_bandwidth media_session_bandiwdth;
 	str			sdp_information;
+	str			label;
 };
 
 struct endpoint_map {

t/auto-daemon-tests.pl

@@ -4455,6 +4455,7 @@ m=video PORT RTP/AVP 99 97 126 123
 c=IN IP6 2001:db8:4321::1
 b=TIAS:5952000
 a=mid:2
+a=label:11
 a=rtpmap:99 H265/90000
 a=fmtp:99  level-id=90;max-lsr=125337600;max-lps=2088960;max-tr=22;max-tc=20;max-fps=6000;x-cisco-hevc=529
 a=rtpmap:97 H264/90000
@@ -4467,7 +4468,6 @@ a=rtcp-fb:* ccm pan
 a=rtcp-fb:* nack pli
 a=rtcp-fb:* ccm fir
 a=rtcp-fb:* ccm tmmbr
-a=label:11
 a=answer:full
 a=extmap:4 http://protocols.cisco.com/timestamp#100us
 a=cisco-mari-psre:97 ltrf=3
@@ -4926,6 +4926,7 @@ m=video 0 RTP/AVP 99 97 126 123
 c=IN IP6 ::
 b=TIAS:5952000
 a=mid:2
+a=label:11
 m=application 0 RTP/SAVP 96
 c=IN IP4 0.0.0.0
 a=mid:5
@@ -24810,6 +24811,7 @@ t=0 0
 m=audio PORT RTP/AVP 104 9 103 111 8 101
 c=IN IP4 203.0.113.1
 a=mid:1
+a=label:main-audio
 a=rtpmap:104 SILK/16000
 a=rtpmap:9 G722/8000
 a=rtpmap:103 SILK/8000
@@ -24818,7 +24820,6 @@ a=fmtp:111 bitrate=16000
 a=rtpmap:8 PCMA/8000
 a=rtpmap:101 telephone-event/8000
 a=fmtp:101 0-16
-a=label:main-audio
 a=sendrecv
 a=rtcp:PORT
 a=ptime:20