MT#61630 moh: support inactive hold

Support inactive hold, because some
client implementations (such as Zoiper5)
are using `a=inactive` for their holds.

For us this means, either of this
puts the other side on hold:
- `sendonly: !MEDIA_ISSET(media, SEND) && MEDIA_ISSET(media, RECV)`
- `inactive: !MEDIA_ISSET(media, SEND) && !MEDIA_ISSET(media, RECV)`

Change-Id: I75562eee60220885e233fa965bf22da92850a8f4

daemon/call.c

@@ -3464,17 +3464,20 @@ struct media_subscription *call_ml_get_top_ms(struct call_monologue *ml) {
 }
 
 /**
- * Checks if any present audio medias put this monologue into sendonly state.
+ * Checks if any present audio medias are sendonly/inactive.
  * Should only be used when medias are already initialized with flags.
  */
-bool call_ml_sendonly(struct call_monologue *ml) {
+bool call_ml_sendonly_inactive(struct call_monologue *ml) {
 	for (int i = 0; i < ml->medias->len; i++)
 	{
 		struct call_media * media = ml->medias->pdata[i];
 		if (!media || media->type_id != MT_AUDIO)
 			continue;
-		/* sendonly media means it can receive packets, but doesn't send */
-		if (!MEDIA_ISSET(media, SEND) && MEDIA_ISSET(media, RECV))
+		/* sendonly media for rtpengine means: receive from this media, but don't send to it
+		 * sendonly: !MEDIA_ISSET(media, SEND) && MEDIA_ISSET(media, RECV)
+		 * inactive: !MEDIA_ISSET(media, SEND) && !MEDIA_ISSET(media, RECV)
+		 */
+		if (!MEDIA_ISSET(media, SEND))
 			return true;
 	}
 	return false;

daemon/media_player.c

@@ -1218,7 +1218,7 @@ static bool media_player_add_file(struct media_player *mp, media_player_opts_t o
 
 bool call_ml_wants_moh(struct call_monologue *ml, enum ng_opmode opmode)
 {
-	if (opmode == OP_OFFER && call_ml_sendonly(ml) &&
+	if (opmode == OP_OFFER && call_ml_sendonly_inactive(ml) &&
 		(ml->moh_db_id > 0 || ml->moh_file.len || ml->moh_blob.len))
 	{
 		return true;
@@ -1230,7 +1230,7 @@ bool call_ml_stops_moh(struct call_monologue *from_ml, struct call_monologue *to
 		enum ng_opmode opmode)
 {
 #ifdef WITH_TRANSCODING
-	if (opmode == OP_OFFER && !call_ml_sendonly(from_ml) && (to_ml->player && to_ml->player->moh))
+	if (opmode == OP_OFFER && !call_ml_sendonly_inactive(from_ml) && (to_ml->player && to_ml->player->moh))
 	{
 		return true;
 	}

include/call.h

@@ -816,7 +816,7 @@ struct packet_stream *__packet_stream_new(call_t *call);
 void __add_media_subscription(struct call_media * which, struct call_media * to,
 		const struct sink_attrs *attrs);
 struct media_subscription *call_ml_get_top_ms(struct call_monologue *ml);
-bool call_ml_sendonly(struct call_monologue *ml);
+bool call_ml_sendonly_inactive(struct call_monologue *ml);
 struct media_subscription *call_media_get_top_ms(struct call_media * cm);
 struct media_subscription *call_get_media_subscription(subscription_ht ht, struct call_media * cm);
 struct call_monologue * ml_medias_subscribed_to_single_ml(struct call_monologue *ml);