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ptpclock: Use the current path delay for calculation the local/remote clock times

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The mean might currently be changing, and the current path delay is the
closest we can get to the actual delay around the current SYNC message.
This commit is contained in:
Sebastian Dröge 2015-06-07 08:59:23 +02:00
parent 9e0f051990
commit 64773fee9c
1 changed files with 14 additions and 0 deletions
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14
libs/gst/net/gstptpclock.c
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@ -1048,15 +1048,29 @@ update_ptp_time (PtpDomainData * domain, PtpPendingSync * sync)
#endif
#ifdef USE_ONLY_SYNC_WITH_DELAY
GstClockTime mean_path_delay;
if (sync->delay_req_send_time_local == GST_CLOCK_TIME_NONE)
return;
/* IEEE 1588 11.3 */
mean_path_delay =
(sync->delay_req_recv_time_remote - sync->sync_send_time_remote +
sync->sync_recv_time_local - sync->delay_req_send_time_local -
(sync->correction_field_sync + sync->correction_field_delay +
32768) / 65536) / 2;
#endif
/* IEEE 1588 11.2 */
corrected_ptp_time =
sync->sync_send_time_remote +
(sync->correction_field_sync + 32768) / 65536;
#ifdef USE_ONLY_SYNC_WITH_DELAY
corrected_local_time = sync->sync_recv_time_local - mean_path_delay;
#else
corrected_local_time = sync->sync_recv_time_local - domain->mean_path_delay;
#endif
#ifdef USE_MEASUREMENT_FILTERING
/* We check this here and when updating the mean path delay, because