refactor: use msgb to receive, pass and send RTP packets
Instead of numerous arguments (buf, len and context data), use a msgb, like
most other osmo programs do, with a msb->cb pointing at a context data struct.
This opens the future for adding/stripping IuUP header data from the msgb
easily.
(Checked to pass current ttcn3-mgw-tests.)
Change-Id: I3af40b63bc49f8636d4e7ea2f8f83bb67f6619ee
diff --git a/src/libosmo-mgcp/mgcp_codec.c b/src/libosmo-mgcp/mgcp_codec.c
index 9ac5fbb..58079c6 100644
--- a/src/libosmo-mgcp/mgcp_codec.c
+++ b/src/libosmo-mgcp/mgcp_codec.c
@@ -432,3 +432,28 @@
return codec_dst->payload_type;
}
+
+/* Find the payload type number configured for a specific codec by SDP.
+ * For example, IuUP gets assigned a payload type number, and the endpoint needs to translate that to the number
+ * assigned to "AMR" on the other conn (by a=rtpmap:N).
+ * \param conn The side of an endpoint to get the payload type number for (to translate the payload type number to).
+ * \param subtype_name SDP codec name without parameters (e.g. "AMR").
+ * \param match_nr Index for the match found, first being match_nr == 0. Iterate all matches by calling multiple times
+ * with incrementing match_nr.
+ * \return codec definition for that conn matching the subtype_name, or NULL if no such match_nr is found.
+ */
+const struct mgcp_rtp_codec *mgcp_codec_pt_find_by_subtype_name(struct mgcp_conn_rtp *conn,
+ const char *subtype_name, unsigned int match_nr)
+{
+ int i;
+ for (i = 0; i < conn->end.codecs_assigned; i++) {
+ if (!strcmp(conn->end.codecs[i].subtype_name, subtype_name)) {
+ if (match_nr) {
+ match_nr--;
+ continue;
+ }
+ return &conn->end.codecs[i];
+ }
+ }
+ return NULL;
+}