rtp: add function to duplicate rtp_dyn_payload_t

There is no way to iterate through the contents. For a future patch to
the SDP dissector (where the session-level info is copied to the
media-level), it would be nice to duplicate the dynamic payload info.

Change-Id: I79b8349e5e157298a28fc608e20c2c2e03e76400
Reviewed-on: https://code.wireshark.org/review/19106
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/epan/dissectors/packet-rtp.c b/epan/dissectors/packet-rtp.c
index ab01da6cde..2efc2deed4 100644
--- a/epan/dissectors/packet-rtp.c
+++ b/epan/dissectors/packet-rtp.c
@@ -1006,6 +1006,27 @@ rtp_dyn_payload_t* rtp_dyn_payload_new(void)
     return rtp_dyn_payload;
 }
 
+/* Creates a copy of the given dynamic payload information. */
+rtp_dyn_payload_t* rtp_dyn_payload_dup(rtp_dyn_payload_t *rtp_dyn_payload)
+{
+    rtp_dyn_payload_t *rtp_dyn_payload2 = rtp_dyn_payload_new();
+    GHashTableIter iter;
+    gpointer key, value;
+
+    g_hash_table_iter_init(&iter, rtp_dyn_payload->table);
+    while (g_hash_table_iter_next(&iter, &key, &value)) {
+        const guint pt = GPOINTER_TO_UINT(key);
+        encoding_name_and_rate_t *encoding_name_and_rate_pt =
+            (encoding_name_and_rate_t *)value;
+
+        rtp_dyn_payload_insert(rtp_dyn_payload2, pt,
+                encoding_name_and_rate_pt->encoding_name,
+                encoding_name_and_rate_pt->sample_rate);
+    }
+
+    return rtp_dyn_payload2;
+}
+
 static rtp_dyn_payload_t*
 rtp_dyn_payload_ref(rtp_dyn_payload_t *rtp_dyn_payload)
 {