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6931f9a7a4
Since no transcoding is in place osmo-mgw forwards the incoming rtp packets as they are (there may be minor modifications of the header) from an ingress connection to an egress connection. This works without problems as long as both connections use the same payload type. For IANA defined fixed payload type numbers this is usually the case, but for dynemic payload type numbers both ends may set up the same codecs but with different payload type numbers. When different payload type numbers are set up, and the packet is passed through without modification, it will have the wrong payload type when it is sent. The receiving end may then toss the packet since it expects packets with the payload type it has configured. The machanism, which is introduced with this patch looks up actual codec inside the struct data of the ingress connection and then looks for the matching codec in the struct data of the egress connection. When it finds the codec there it looks up the payload type of this codec. The header of the RTP packet is then patched with the correct payoad type. - Add function mgcp_codec_pt_translate() to look up the payload type - Add unit-test for function mgcp_codec_pt_translate() - Add payload type translation to mgcp_network.c Change-Id: I3a874e59fa07bcc2a67c376cafa197360036f539 Related: OS#2728 Related: OS#3384
8 lines
374 B
C
8 lines
374 B
C
#pragma once
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void mgcp_codec_summary(struct mgcp_conn_rtp *conn);
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void mgcp_codec_reset_all(struct mgcp_conn_rtp *conn);
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int mgcp_codec_add(struct mgcp_conn_rtp *conn, int payload_type, const char *audio_name);
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int mgcp_codec_decide(struct mgcp_conn_rtp *conn);
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int mgcp_codec_pt_translate(struct mgcp_conn_rtp *conn_src, struct mgcp_conn_rtp *conn_dst, int payload_type);
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