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Jacob Erlbeck jerlbeck at sysmocom.deThe tsdelta computation and error detection didn't handle the intialisation phase properly. This patches fixes this by skipping the output timing validation for the first packet. Sponsored-by: On-Waves ehf --- openbsc/src/libmgcp/mgcp_network.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/openbsc/src/libmgcp/mgcp_network.c b/openbsc/src/libmgcp/mgcp_network.c index 75d39c1..1ce9cc2 100644 --- a/openbsc/src/libmgcp/mgcp_network.c +++ b/openbsc/src/libmgcp/mgcp_network.c @@ -219,6 +219,7 @@ void mgcp_patch_and_count(struct mgcp_endpoint *endp, struct mgcp_rtp_state *sta uint32_t timestamp; struct rtp_hdr *rtp_hdr; int payload = rtp_end->payload_type; + int initializing = 0; if (len < sizeof(*rtp_hdr)) return; @@ -229,6 +230,7 @@ void mgcp_patch_and_count(struct mgcp_endpoint *endp, struct mgcp_rtp_state *sta arrival_time = get_current_ts(); if (!state->initialized) { + initializing = 1; state->in_stream.last_seq = seq - 1; state->in_stream.ssrc = state->orig_ssrc = rtp_hdr->ssrc; state->in_stream.last_tsdelta = 0; @@ -237,6 +239,14 @@ void mgcp_patch_and_count(struct mgcp_endpoint *endp, struct mgcp_rtp_state *sta state->jitter = 0; state->transit = arrival_time - timestamp; state->out_stream = state->in_stream; + state->out_stream.last_timestamp = timestamp; + LOGP(DMGCP, LOGL_INFO, + "Initializing stream on 0x%x SSRC: %u timestamp: %u " + "from %s:%d in %d\n", + ENDPOINT_NUMBER(endp), state->in_stream.ssrc, + state->seq_offset, + inet_ntoa(addr->sin_addr), ntohs(addr->sin_port), + endp->conn_mode); } else if (state->in_stream.ssrc != rtp_hdr->ssrc) { int32_t tsdelta = state->out_stream.last_tsdelta; if (tsdelta == 0) { @@ -286,9 +296,10 @@ void mgcp_patch_and_count(struct mgcp_endpoint *endp, struct mgcp_rtp_state *sta } /* Check again, whether the timestamps are still valid */ - check_rtp_timestamp(endp, &state->out_stream, rtp_end, addr, - seq, timestamp, "output", - &state->out_stream.last_tsdelta); + if (!initializing) + check_rtp_timestamp(endp, &state->out_stream, rtp_end, addr, + seq, timestamp, "output", + &state->out_stream.last_tsdelta); /* * The below takes the shape of the validation from Appendix A. Check -- 1.7.9.5