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strct mgcp_rtp_state: Group + document struct members related to patching

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Change-Id: I403ddcafe0a11290103bb017568cfacaf5c04412
This commit is contained in:
Harald Welte
2017-12-25 09:44:26 +01:00
parent 5dbfc78aff
commit 3338135ead
2 changed files with 31 additions and 24 deletions
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17
include/osmocom/mgcp/mgcp_internal.h
View File

@@ -50,14 +50,21 @@ struct mgcp_rtp_stream_state {
};
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;

38
src/libosmo-mgcp/mgcp_network.c
View File

@@ -231,7 +231,7 @@ static int check_rtp_timestamp(struct mgcp_endpoint *endp,
"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));
}
@@ -325,15 +325,15 @@ static int adjust_rtp_timestamp_offset(struct mgcp_endpoint *endp,
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));
}
@@ -354,11 +354,11 @@ static int align_rtp_timestamp_offset(struct mgcp_endpoint *endp,
/* 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 "
@@ -366,7 +366,7 @@ static int align_rtp_timestamp_offset(struct mgcp_endpoint *endp,
"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));
}
@@ -375,7 +375,7 @@ static int align_rtp_timestamp_offset(struct mgcp_endpoint *endp,
* 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 */
@@ -508,7 +508,7 @@ void mgcp_patch_and_count(struct mgcp_endpoint *endp,
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);
@@ -519,7 +519,7 @@ void mgcp_patch_and_count(struct mgcp_endpoint *endp,
"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 =
@@ -543,7 +543,7 @@ void mgcp_patch_and_count(struct mgcp_endpoint *endp,
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 */
@@ -555,8 +555,8 @@ void mgcp_patch_and_count(struct mgcp_endpoint *endp,
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;
@@ -565,7 +565,7 @@ void mgcp_patch_and_count(struct mgcp_endpoint *endp,
"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));
}
@@ -576,8 +576,8 @@ void mgcp_patch_and_count(struct mgcp_endpoint *endp,
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 */
@@ -592,15 +592,15 @@ void mgcp_patch_and_count(struct mgcp_endpoint *endp,
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 */