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Harald Welte gerrit-no-reply at lists.osmocom.org
Review at https://gerrit.osmocom.org/5581
strct mgcp_rtp_state: Group + document struct members related to patching
Change-Id: I403ddcafe0a11290103bb017568cfacaf5c04412
---
M include/osmocom/mgcp/mgcp_internal.h
M src/libosmo-mgcp/mgcp_network.c
2 files changed, 31 insertions(+), 24 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-mgw refs/changes/81/5581/1
diff --git a/include/osmocom/mgcp/mgcp_internal.h b/include/osmocom/mgcp/mgcp_internal.h
index c3f9ba1..8d82b14 100644
--- a/include/osmocom/mgcp/mgcp_internal.h
+++ b/include/osmocom/mgcp/mgcp_internal.h
@@ -50,14 +50,21 @@
};
struct mgcp_rtp_state {
+ /* has this state structure been initialized? */
int initialized;
- int patch_ssrc;
- uint32_t orig_ssrc;
+ struct {
+ /* are we patching the SSRC value? */
+ int patch_ssrc;
+ /* original SSRC (to which we shall patch any different SSRC) */
+ uint32_t orig_ssrc;
+ /* offset to apply on the sequence number */
+ int seq_offset;
+ /* offset to apply on the timestamp number */
+ int32_t timestamp_offset;
+ } patch;
- int seq_offset;
-
- int32_t timestamp_offset;
+ /* duration of a packet (FIXME: in which unit?) */
uint32_t packet_duration;
struct mgcp_rtp_stream_state in_stream;
diff --git a/src/libosmo-mgcp/mgcp_network.c b/src/libosmo-mgcp/mgcp_network.c
index fc6a1c8..877ce98 100644
--- a/src/libosmo-mgcp/mgcp_network.c
+++ b/src/libosmo-mgcp/mgcp_network.c
@@ -230,7 +230,7 @@
"on 0x%x SSRC: %u timestamp: %u "
"from %s:%d\n",
text, seq,
- state->timestamp_offset, state->seq_offset,
+ state->patch.timestamp_offset, state->patch.seq_offset,
ENDPOINT_NUMBER(endp), sstate->ssrc, timestamp,
inet_ntoa(addr->sin_addr), ntohs(addr->sin_port));
}
@@ -324,15 +324,15 @@
out_timestamp = state->out_stream.last_timestamp + delta_seq * tsdelta;
timestamp_offset = out_timestamp - in_timestamp;
- if (state->timestamp_offset != timestamp_offset) {
- state->timestamp_offset = timestamp_offset;
+ if (state->patch.timestamp_offset != timestamp_offset) {
+ state->patch.timestamp_offset = timestamp_offset;
LOGP(DRTP, LOGL_NOTICE,
"Timestamp offset change on 0x%x SSRC: %u "
"SeqNo delta: %d, TS offset: %d, "
"from %s:%d\n",
ENDPOINT_NUMBER(endp), state->in_stream.ssrc,
- delta_seq, state->timestamp_offset,
+ delta_seq, state->patch.timestamp_offset,
inet_ntoa(addr->sin_addr), ntohs(addr->sin_port));
}
@@ -353,11 +353,11 @@
/* Align according to: T + Toffs - Tlast = k * Tptime */
ts_error = ts_alignment_error(&state->out_stream, ptime,
- timestamp + state->timestamp_offset);
+ timestamp + state->patch.timestamp_offset);
/* If there is an alignment error, we have to compensate it */
if (ts_error) {
- state->timestamp_offset += ptime - ts_error;
+ state->patch.timestamp_offset += ptime - ts_error;
LOGP(DRTP, LOGL_NOTICE,
"Corrected timestamp alignment error of %d on 0x%x SSRC: %u "
@@ -365,7 +365,7 @@
"from %s:%d\n",
ts_error,
ENDPOINT_NUMBER(endp), state->in_stream.ssrc,
- state->timestamp_offset, inet_ntoa(addr->sin_addr),
+ state->patch.timestamp_offset, inet_ntoa(addr->sin_addr),
ntohs(addr->sin_port));
}
@@ -374,7 +374,7 @@
* here would point to a serous problem with the alingnment
* error computation fuction */
ts_check = ts_alignment_error(&state->out_stream, ptime,
- timestamp + state->timestamp_offset);
+ timestamp + state->patch.timestamp_offset);
OSMO_ASSERT(ts_check == 0);
/* Return alignment error before compensation */
@@ -507,7 +507,7 @@
if (!state->initialized) {
state->initialized = 1;
state->in_stream.last_seq = seq - 1;
- state->in_stream.ssrc = state->orig_ssrc = ssrc;
+ state->in_stream.ssrc = state->patch.orig_ssrc = ssrc;
state->in_stream.last_tsdelta = 0;
state->packet_duration =
mgcp_rtp_packet_duration(endp, rtp_end);
@@ -518,7 +518,7 @@
"endpoint:0x%x initializing stream, SSRC: %u timestamp: %u "
"pkt-duration: %d, from %s:%d\n",
ENDPOINT_NUMBER(endp), state->in_stream.ssrc,
- state->seq_offset, state->packet_duration,
+ state->patch.seq_offset, state->packet_duration,
inet_ntoa(addr->sin_addr), ntohs(addr->sin_port));
if (state->packet_duration == 0) {
state->packet_duration =
@@ -542,7 +542,7 @@
int16_t delta_seq;
/* Always increment seqno by 1 */
- state->seq_offset =
+ state->patch.seq_offset =
(state->out_stream.last_seq + 1) - seq;
/* Estimate number of packets that would have been sent */
@@ -554,8 +554,8 @@
adjust_rtp_timestamp_offset(endp, state, rtp_end, addr,
delta_seq, timestamp);
- state->patch_ssrc = 1;
- ssrc = state->orig_ssrc;
+ state->patch.patch_ssrc = 1;
+ ssrc = state->patch.orig_ssrc;
if (rtp_end->force_constant_ssrc != -1)
rtp_end->force_constant_ssrc -= 1;
@@ -564,7 +564,7 @@
"SeqNo offset: %d, TS offset: %d "
"from %s:%d\n",
ENDPOINT_NUMBER(endp), state->in_stream.ssrc,
- state->seq_offset, state->timestamp_offset,
+ state->patch.seq_offset, state->patch.timestamp_offset,
inet_ntoa(addr->sin_addr), ntohs(addr->sin_port));
}
@@ -575,8 +575,8 @@
addr, seq, timestamp, "input",
&state->in_stream.last_tsdelta);
- if (state->patch_ssrc)
- ssrc = state->orig_ssrc;
+ if (state->patch.patch_ssrc)
+ ssrc = state->patch.orig_ssrc;
}
/* Save before patching */
@@ -591,15 +591,15 @@
timestamp);
/* Store the updated SSRC back to the packet */
- if (state->patch_ssrc)
+ if (state->patch.patch_ssrc)
rtp_hdr->ssrc = htonl(ssrc);
/* Apply the offset and store it back to the packet.
* This won't change anything if the offset is 0, so the conditional is
* omitted. */
- seq += state->seq_offset;
+ seq += state->patch.seq_offset;
rtp_hdr->sequence = htons(seq);
- timestamp += state->timestamp_offset;
+ timestamp += state->patch.timestamp_offset;
rtp_hdr->timestamp = htonl(timestamp);
/* Check again, whether the timestamps are still valid */
--
To view, visit https://gerrit.osmocom.org/5581
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I403ddcafe0a11290103bb017568cfacaf5c04412
Gerrit-PatchSet: 1
Gerrit-Project: osmo-mgw
Gerrit-Branch: master
Gerrit-Owner: Harald Welte <laforge at gnumonks.org>