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ptp: Initialize expected DELAY_REQ seqnum to an invalid value

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This allows distinguishing pending syncs that didn't have a DELAY_REQ
sent from ones that did but used a seqnum of 0, like the very first one.

Specifically, if the first one or more syncs are still pending and we
send the first DELAY_REQ for a later pending sync, then the DELAY_RESP
would've been wrongly associated to the very first pending sync because
of the seqnum.

Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3383

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6361>
This commit is contained in:
Sebastian Dröge 2024-03-13 19:12:48 +02:00 committed by GStreamer Marge Bot
parent 1d8138fd18
commit 6c3d09e279
1 changed files with 3 additions and 2 deletions
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5
subprojects/gstreamer/libs/gst/net/gstptpclock.c
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@ -321,14 +321,14 @@ typedef struct
{
guint domain;
guint16 sync_seqnum;
guint32 sync_seqnum;
GstClockTime sync_recv_time_local; /* t2 */
GstClockTime sync_send_time_remote; /* t1, might be -1 if FOLLOW_UP pending */
GstClockTime follow_up_recv_time_local;
GSource *timeout_source;
guint8 iface_idx;
guint16 delay_req_seqnum;
guint32 delay_req_seqnum;
GstClockTime delay_req_send_time_local; /* t3, -1 if we wait for FOLLOW_UP */
GstClockTime delay_req_recv_time_remote; /* t4, -1 if we wait */
GstClockTime delay_resp_recv_time_local;
@ -1668,6 +1668,7 @@ handle_sync_message (PtpMessage * msg, guint8 iface_idx,
sync->delay_req_send_time_local = GST_CLOCK_TIME_NONE;
sync->delay_req_recv_time_remote = GST_CLOCK_TIME_NONE;
sync->delay_resp_recv_time_local = GST_CLOCK_TIME_NONE;
sync->delay_req_seqnum = G_MAXUINT32;
/* 0.5 correction factor for division later */
sync->correction_field_sync = msg->correction_field;