MT#55447 parse out a=fmtp early

Parse out the format parameters for a payload type object when the codec
definition is loaded. Parsing it out is done only once, and if done
early the parsed contents can be used for format checking, comparing,
matching, etc.

Change-Id: I2856e5a8d4d76e7e1e648eff4a91fc51d0ba20c2

daemon/codec.c

@@ -523,6 +523,7 @@ struct codec_handler *codec_handler_make_playback(const struct rtp_payload_type
 	return handler;
 }
 
+// does not init/parse a=fmtp
 static void ensure_codec_def_type(struct rtp_payload_type *pt, enum media_type type) {
 	if (pt->codec_def)
 		return;
@@ -533,10 +534,13 @@ static void ensure_codec_def_type(struct rtp_payload_type *pt, enum media_type t
 	if (!pt->codec_def->support_encoding || !pt->codec_def->support_decoding)
 		pt->codec_def = NULL;
 }
+// does init/parse a=fmtp
 void ensure_codec_def(struct rtp_payload_type *pt, struct call_media *media) {
 	if (!media)
 		return;
 	ensure_codec_def_type(pt, media->type_id);
+	if (pt->codec_def)
+		codec_parse_fmtp(pt->codec_def, &pt->format, &pt->format_parameters, NULL);
 }
 
 // only called from codec_handlers_update()
@@ -2176,6 +2180,8 @@ void codec_init_payload_type(struct rtp_payload_type *pt, enum media_type type)
 		if (!pt->format_parameters.s && def->default_fmtp)
 			str_init(&pt->format_parameters, (char *) def->default_fmtp);
 
+		codec_parse_fmtp(def, &pt->format, &pt->format_parameters, NULL);
+
 		if (def->init)
 			def->init(pt);