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

@@ -2862,6 +2862,15 @@ static void media_set_siprec_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);
+}
+
 __attribute__((nonnull(1)))
 static unsigned int media_bundle_extmap_id(struct call_media *media) {
 	__auto_type ml = media->monologue;
@@ -3874,6 +3883,7 @@ int monologue_offer_answer(struct call_monologue *monologues[2], sdp_streams_q *
 		}
 		else
 			media_answer_media_id(sender_media, sp);
+		media_update_label(receiver_media, flags, &sp->label);
 		media_loop_protect(sp, sender_media);
 		media_update_flags(sender_media, sp);
 		media_update_crypto(sender_media, sp, flags);
@@ -4433,6 +4443,7 @@ static int monologue_subscribe_request1(struct call_monologue *src_ml, struct ca
 		media_set_echo(src_media, flags);
 		media_set_echo_reverse(dst_media, flags);
 		media_set_siprec_label(dst_media, flags, src_media->unique_id);
+		media_update_label(dst_media, flags, &src_media->label);
 		media_update_type(dst_media, sp);
 		media_set_protocol(dst_media, src_media, sp, flags);
 		media_gen_media_id(dst_media, flags);

daemon/sdp.c

@@ -68,6 +68,7 @@ enum attr_id {
 	ATTR_MOH_ATTR_NAME,
 	ATTR_EXTMAP,
 	ATTR_EXTMAP_ALLOW_MIXED,
+	ATTR_LABEL,
 };
 // make sure g_direct_hash can be used
 static_assert(sizeof(void *) >= sizeof(enum attr_id), "sizeof enum attr_id wrong");
@@ -1331,6 +1332,9 @@ static bool 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))
@@ -2155,6 +2159,11 @@ bool sdp_streams(const sdp_sessions_q *sessions, sdp_streams_q *streams, sdp_ng_
 			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);
@@ -2908,7 +2917,7 @@ 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);
 	if (media->bundle && MEDIA_ISSET(media, BUNDLE_ONLY) && flags->opmode == OP_OFFER
 			&& media->bundle != media)

include/call.h

@@ -385,6 +385,7 @@ struct stream_params {
 	struct session_bandwidth media_session_bandiwdth;
 	str			sdp_information;
 	extmap_q		extmap;
+	str			label;
 };
 
 struct endpoint_map {

t/auto-daemon-tests.pl

@@ -4456,6 +4456,7 @@ 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
@@ -4470,7 +4471,6 @@ 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=cisco-mari-psre:97 ltrf=3
 a=cisco-mari-psre:126 ltrf=3
@@ -4927,6 +4927,7 @@ 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
@@ -24876,6 +24877,7 @@ 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
@@ -24884,7 +24886,6 @@ 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