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mgcp: Only patch the header if we had a change in SSRC

This commit is contained in:
Holger Hans Peter Freyther 2010-08-03 15:36:57 +00:00
parent 89976e8285
commit 5c1e6cf5fc
2 changed files with 9 additions and 5 deletions
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1
openbsc/include/openbsc/mgcp_internal.h
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@ -38,6 +38,7 @@ enum mgcp_connection_mode {
struct mgcp_rtp_state {
int initialized;
int patch;
uint32_t orig_ssrc;
uint32_t ssrc;

13
openbsc/src/mgcp/mgcp_network.c
View File

@ -116,17 +116,20 @@ static void patch_and_count(struct mgcp_rtp_state *state, int payload, char *dat
state->ssrc = rtp_hdr->ssrc;
state->seq_offset = (state->seq_no + 1) - seq;
state->timestamp_offset = state->last_timestamp - timestamp;
state->patch = 1;
LOGP(DMGCP, LOGL_NOTICE, "The SSRC changed... SSRC: %u offset: %d\n",
state->ssrc, state->seq_offset);
}
/* apply the offset and store it back to the packet */
seq += state->seq_offset;
rtp_hdr->sequence = htons(seq);
rtp_hdr->ssrc = state->orig_ssrc;
if (state->patch) {
seq += state->seq_offset;
rtp_hdr->sequence = htons(seq);
rtp_hdr->ssrc = state->orig_ssrc;
timestamp += state->timestamp_offset;
rtp_hdr->timestamp = htonl(timestamp);
timestamp += state->timestamp_offset;
rtp_hdr->timestamp = htonl(timestamp);
}
/* seq changed, now compare if we have lost something */
if (state->seq_no + 1u != seq)