2 * Copyright (C) 2015 Sebastian Dröge <sebastian@centricular.com>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
23 * @short_description: Special clock that synchronizes to a remote time
24 * provider via PTP (IEEE1588:2008).
25 * @see_also: #GstClock, #GstNetClientClock, #GstPipeline
27 * GstPtpClock implements a PTP (IEEE1588:2008) ordinary clock in slave-only
28 * mode, that allows a GStreamer pipeline to synchronize to a PTP network
29 * clock in some specific domain.
31 * The PTP subsystem can be initialized with gst_ptp_init(), which then starts
32 * a helper process to do the actual communication via the PTP ports. This is
33 * required as PTP listens on ports < 1024 and thus requires special
34 * privileges. Once this helper process is started, the main process will
35 * synchronize to all PTP domains that are detected on the selected
38 * gst_ptp_clock_new() then allows to create a GstClock that provides the PTP
39 * time from a master clock inside a specific PTP domain. This clock will only
40 * return valid timestamps once the timestamps in the PTP domain are known. To
41 * check this, you can use gst_clock_wait_for_sync(), the GstClock::synced
42 * signal and gst_clock_is_synced().
44 * To gather statistics about the PTP clock synchronization,
45 * gst_ptp_statistics_callback_add() can be used. This gives the application
46 * the possibility to collect all kinds of statistics from the clock
56 #include "gstptpclock.h"
58 #include "gstptp_private.h"
60 #ifdef HAVE_SYS_WAIT_H
64 #define WIN32_LEAN_AND_MEAN
67 #include <sys/types.h>
71 #elif defined(G_OS_WIN32)
75 #include <gst/base/base.h>
77 GST_DEBUG_CATEGORY_STATIC (ptp_debug);
78 #define GST_CAT_DEFAULT (ptp_debug)
80 /* IEEE 1588 7.7.3.1 */
81 #define PTP_ANNOUNCE_RECEIPT_TIMEOUT 4
83 /* Use a running average for calculating the mean path delay instead
84 * of just using the last measurement. Enabling this helps in unreliable
85 * networks, like wifi, with often changing delays
87 * Undef for following IEEE1588-2008 by the letter
89 #define USE_RUNNING_AVERAGE_DELAY 1
91 /* Filter out any measurements that are above a certain threshold compared to
92 * previous measurements. Enabling this helps filtering out outliers that
93 * happen fairly often in unreliable networks, like wifi.
95 * Undef for following IEEE1588-2008 by the letter
97 #define USE_MEASUREMENT_FILTERING 1
99 /* Select the first clock from which we capture a SYNC message as the master
100 * clock of the domain until we are ready to run the best master clock
101 * algorithm. This allows faster syncing but might mean a change of the master
102 * clock in the beginning. As all clocks in a domain are supposed to use the
103 * same time, this shouldn't be much of a problem.
105 * Undef for following IEEE1588-2008 by the letter
107 #define USE_OPPORTUNISTIC_CLOCK_SELECTION 1
109 /* Only consider SYNC messages for which we are allowed to send a DELAY_REQ
110 * afterwards. This allows better synchronization in networks with varying
111 * delays, as for every other SYNC message we would have to assume that it's
112 * the average of what we saw before. But that might be completely off
114 #define USE_ONLY_SYNC_WITH_DELAY 1
116 /* Filter out delay measurements that are too far away from the median of the
117 * last delay measurements, currently those that are more than 2 times as big.
118 * This increases accuracy a lot on wifi.
120 #define USE_MEDIAN_PRE_FILTERING 1
121 #define MEDIAN_PRE_FILTERING_WINDOW 9
123 /* How many updates should be skipped at maximum when using USE_MEASUREMENT_FILTERING */
124 #define MAX_SKIPPED_UPDATES 5
128 PTP_MESSAGE_TYPE_SYNC = 0x0,
129 PTP_MESSAGE_TYPE_DELAY_REQ = 0x1,
130 PTP_MESSAGE_TYPE_PDELAY_REQ = 0x2,
131 PTP_MESSAGE_TYPE_PDELAY_RESP = 0x3,
132 PTP_MESSAGE_TYPE_FOLLOW_UP = 0x8,
133 PTP_MESSAGE_TYPE_DELAY_RESP = 0x9,
134 PTP_MESSAGE_TYPE_PDELAY_RESP_FOLLOW_UP = 0xA,
135 PTP_MESSAGE_TYPE_ANNOUNCE = 0xB,
136 PTP_MESSAGE_TYPE_SIGNALING = 0xC,
137 PTP_MESSAGE_TYPE_MANAGEMENT = 0xD
142 guint64 seconds_field; /* 48 bits valid */
143 guint32 nanoseconds_field;
146 #define PTP_TIMESTAMP_TO_GST_CLOCK_TIME(ptp) (ptp.seconds_field * GST_SECOND + ptp.nanoseconds_field)
147 #define GST_CLOCK_TIME_TO_PTP_TIMESTAMP_SECONDS(gst) (((GstClockTime) gst) / GST_SECOND)
148 #define GST_CLOCK_TIME_TO_PTP_TIMESTAMP_NANOSECONDS(gst) (((GstClockTime) gst) % GST_SECOND)
152 guint64 clock_identity;
157 compare_clock_identity (const PtpClockIdentity * a, const PtpClockIdentity * b)
159 if (a->clock_identity < b->clock_identity)
161 else if (a->clock_identity > b->clock_identity)
164 if (a->port_number < b->port_number)
166 else if (a->port_number > b->port_number)
175 guint8 clock_accuracy;
176 guint16 offset_scaled_log_variance;
181 guint8 transport_specific;
182 PtpMessageType message_type;
183 /* guint8 reserved; */
185 guint16 message_length;
186 guint8 domain_number;
187 /* guint8 reserved; */
189 gint64 correction_field; /* 48.16 fixed point nanoseconds */
190 /* guint32 reserved; */
191 PtpClockIdentity source_port_identity;
193 guint8 control_field;
194 gint8 log_message_interval;
200 PtpTimestamp origin_timestamp;
201 gint16 current_utc_offset;
202 /* guint8 reserved; */
203 guint8 grandmaster_priority_1;
204 PtpClockQuality grandmaster_clock_quality;
205 guint8 grandmaster_priority_2;
206 guint64 grandmaster_identity;
207 guint16 steps_removed;
213 PtpTimestamp origin_timestamp;
218 PtpTimestamp precise_origin_timestamp;
223 PtpTimestamp origin_timestamp;
228 PtpTimestamp receive_timestamp;
229 PtpClockIdentity requesting_port_identity;
235 static GMutex ptp_lock;
236 static GCond ptp_cond;
237 static gboolean initted = FALSE;
239 static gboolean supported = TRUE;
241 static gboolean supported = FALSE;
243 static GPid ptp_helper_pid;
244 static GThread *ptp_helper_thread;
245 static GMainContext *main_context;
246 static GMainLoop *main_loop;
247 static GIOChannel *stdin_channel, *stdout_channel;
248 static GRand *delay_req_rand;
249 static GstClock *observation_system_clock;
250 static PtpClockIdentity ptp_clock_id = { GST_PTP_CLOCK_ID_NONE, 0 };
254 GstClockTime receive_time;
256 PtpClockIdentity master_clock_identity;
258 guint8 grandmaster_priority_1;
259 PtpClockQuality grandmaster_clock_quality;
260 guint8 grandmaster_priority_2;
261 guint64 grandmaster_identity;
262 guint16 steps_removed;
266 } PtpAnnounceMessage;
270 PtpClockIdentity master_clock_identity;
272 GstClockTime announce_interval; /* last interval we received */
273 GQueue announce_messages;
279 PtpClockIdentity master_clock_identity;
282 GstClockTime sync_recv_time_local; /* t2 */
283 GstClockTime sync_send_time_remote; /* t1, might be -1 if FOLLOW_UP pending */
284 GstClockTime follow_up_recv_time_local;
286 GSource *timeout_source;
287 guint16 delay_req_seqnum;
288 GstClockTime delay_req_send_time_local; /* t3, -1 if we wait for FOLLOW_UP */
289 GstClockTime delay_req_recv_time_remote; /* t4, -1 if we wait */
290 GstClockTime delay_resp_recv_time_local;
292 gint64 correction_field_sync; /* sum of the correction fields of SYNC/FOLLOW_UP */
293 gint64 correction_field_delay; /* sum of the correction fields of DELAY_RESP */
297 ptp_pending_sync_free (PtpPendingSync * sync)
299 if (sync->timeout_source) {
300 g_source_destroy (sync->timeout_source);
301 g_source_unref(sync->timeout_source);
310 GstClockTime last_ptp_time;
311 GstClockTime last_local_time;
312 gint skipped_updates;
314 /* Used for selecting the master/grandmaster */
315 GList *announce_senders;
317 /* Last selected master clock */
318 gboolean have_master_clock;
319 PtpClockIdentity master_clock_identity;
320 guint64 grandmaster_identity;
322 /* Last SYNC or FOLLOW_UP timestamp we received */
323 GstClockTime last_ptp_sync_time;
324 GstClockTime sync_interval;
326 GstClockTime mean_path_delay;
327 GstClockTime last_delay_req, min_delay_req_interval;
328 guint16 last_delay_req_seqnum;
330 GstClockTime last_path_delays[MEDIAN_PRE_FILTERING_WINDOW];
331 gint last_path_delays_missing;
333 GQueue pending_syncs;
335 GstClock *domain_clock;
338 static GList *domain_data;
339 static GMutex domain_clocks_lock;
340 static GList *domain_clocks;
342 /* Protected by PTP lock */
343 static void emit_ptp_statistics (guint8 domain, const GstStructure * stats);
344 static GHookList domain_stats_hooks;
345 static gint domain_stats_n_hooks;
346 static gboolean domain_stats_hooks_initted = FALSE;
348 /* Converts log2 seconds to GstClockTime */
350 log2_to_clock_time (gint l)
353 return GST_SECOND >> (-l);
355 return GST_SECOND << l;
359 dump_ptp_message (PtpMessage * msg)
361 GST_TRACE ("PTP message:");
362 GST_TRACE ("\ttransport_specific: %u", msg->transport_specific);
363 GST_TRACE ("\tmessage_type: 0x%01x", msg->message_type);
364 GST_TRACE ("\tversion_ptp: %u", msg->version_ptp);
365 GST_TRACE ("\tmessage_length: %u", msg->message_length);
366 GST_TRACE ("\tdomain_number: %u", msg->domain_number);
367 GST_TRACE ("\tflag_field: 0x%04x", msg->flag_field);
368 GST_TRACE ("\tcorrection_field: %" G_GINT64_FORMAT ".%03u",
369 (msg->correction_field / 65536),
370 (guint) ((msg->correction_field & 0xffff) * 1000) / 65536);
371 GST_TRACE ("\tsource_port_identity: 0x%016" G_GINT64_MODIFIER "x %u",
372 msg->source_port_identity.clock_identity,
373 msg->source_port_identity.port_number);
374 GST_TRACE ("\tsequence_id: %u", msg->sequence_id);
375 GST_TRACE ("\tcontrol_field: 0x%02x", msg->control_field);
376 GST_TRACE ("\tmessage_interval: %" GST_TIME_FORMAT,
377 GST_TIME_ARGS (log2_to_clock_time (msg->log_message_interval)));
379 switch (msg->message_type) {
380 case PTP_MESSAGE_TYPE_ANNOUNCE:
381 GST_TRACE ("\tANNOUNCE:");
382 GST_TRACE ("\t\torigin_timestamp: %" G_GUINT64_FORMAT ".%09u",
383 msg->message_specific.announce.origin_timestamp.seconds_field,
384 msg->message_specific.announce.origin_timestamp.nanoseconds_field);
385 GST_TRACE ("\t\tcurrent_utc_offset: %d",
386 msg->message_specific.announce.current_utc_offset);
387 GST_TRACE ("\t\tgrandmaster_priority_1: %u",
388 msg->message_specific.announce.grandmaster_priority_1);
389 GST_TRACE ("\t\tgrandmaster_clock_quality: 0x%02x 0x%02x %u",
390 msg->message_specific.announce.grandmaster_clock_quality.clock_class,
391 msg->message_specific.announce.
392 grandmaster_clock_quality.clock_accuracy,
393 msg->message_specific.announce.
394 grandmaster_clock_quality.offset_scaled_log_variance);
395 GST_TRACE ("\t\tgrandmaster_priority_2: %u",
396 msg->message_specific.announce.grandmaster_priority_2);
397 GST_TRACE ("\t\tgrandmaster_identity: 0x%016" G_GINT64_MODIFIER "x",
398 msg->message_specific.announce.grandmaster_identity);
399 GST_TRACE ("\t\tsteps_removed: %u",
400 msg->message_specific.announce.steps_removed);
401 GST_TRACE ("\t\ttime_source: 0x%02x",
402 msg->message_specific.announce.time_source);
404 case PTP_MESSAGE_TYPE_SYNC:
405 GST_TRACE ("\tSYNC:");
406 GST_TRACE ("\t\torigin_timestamp: %" G_GUINT64_FORMAT ".%09u",
407 msg->message_specific.sync.origin_timestamp.seconds_field,
408 msg->message_specific.sync.origin_timestamp.nanoseconds_field);
410 case PTP_MESSAGE_TYPE_FOLLOW_UP:
411 GST_TRACE ("\tFOLLOW_UP:");
412 GST_TRACE ("\t\tprecise_origin_timestamp: %" G_GUINT64_FORMAT ".%09u",
413 msg->message_specific.follow_up.
414 precise_origin_timestamp.seconds_field,
415 msg->message_specific.follow_up.
416 precise_origin_timestamp.nanoseconds_field);
418 case PTP_MESSAGE_TYPE_DELAY_REQ:
419 GST_TRACE ("\tDELAY_REQ:");
420 GST_TRACE ("\t\torigin_timestamp: %" G_GUINT64_FORMAT ".%09u",
421 msg->message_specific.delay_req.origin_timestamp.seconds_field,
422 msg->message_specific.delay_req.origin_timestamp.nanoseconds_field);
424 case PTP_MESSAGE_TYPE_DELAY_RESP:
425 GST_TRACE ("\tDELAY_RESP:");
426 GST_TRACE ("\t\treceive_timestamp: %" G_GUINT64_FORMAT ".%09u",
427 msg->message_specific.delay_resp.receive_timestamp.seconds_field,
428 msg->message_specific.delay_resp.receive_timestamp.nanoseconds_field);
429 GST_TRACE ("\t\trequesting_port_identity: 0x%016" G_GINT64_MODIFIER
431 msg->message_specific.delay_resp.
432 requesting_port_identity.clock_identity,
433 msg->message_specific.delay_resp.
434 requesting_port_identity.port_number);
442 /* IEEE 1588-2008 5.3.3 */
444 parse_ptp_timestamp (PtpTimestamp * timestamp, GstByteReader * reader)
446 g_return_val_if_fail (gst_byte_reader_get_remaining (reader) >= 10, FALSE);
448 timestamp->seconds_field =
449 (((guint64) gst_byte_reader_get_uint32_be_unchecked (reader)) << 16) |
450 gst_byte_reader_get_uint16_be_unchecked (reader);
451 timestamp->nanoseconds_field =
452 gst_byte_reader_get_uint32_be_unchecked (reader);
454 if (timestamp->nanoseconds_field >= 1000000000)
460 /* IEEE 1588-2008 13.3 */
462 parse_ptp_message_header (PtpMessage * msg, GstByteReader * reader)
466 g_return_val_if_fail (gst_byte_reader_get_remaining (reader) >= 34, FALSE);
468 b = gst_byte_reader_get_uint8_unchecked (reader);
469 msg->transport_specific = b >> 4;
470 msg->message_type = b & 0x0f;
472 b = gst_byte_reader_get_uint8_unchecked (reader);
473 msg->version_ptp = b & 0x0f;
474 if (msg->version_ptp != 2) {
475 GST_WARNING ("Unsupported PTP message version (%u != 2)", msg->version_ptp);
479 msg->message_length = gst_byte_reader_get_uint16_be_unchecked (reader);
480 if (gst_byte_reader_get_remaining (reader) + 4 < msg->message_length) {
481 GST_WARNING ("Not enough data (%u < %u)",
482 gst_byte_reader_get_remaining (reader) + 4, msg->message_length);
486 msg->domain_number = gst_byte_reader_get_uint8_unchecked (reader);
487 gst_byte_reader_skip_unchecked (reader, 1);
489 msg->flag_field = gst_byte_reader_get_uint16_be_unchecked (reader);
490 msg->correction_field = gst_byte_reader_get_uint64_be_unchecked (reader);
491 gst_byte_reader_skip_unchecked (reader, 4);
493 msg->source_port_identity.clock_identity =
494 gst_byte_reader_get_uint64_be_unchecked (reader);
495 msg->source_port_identity.port_number =
496 gst_byte_reader_get_uint16_be_unchecked (reader);
498 msg->sequence_id = gst_byte_reader_get_uint16_be_unchecked (reader);
499 msg->control_field = gst_byte_reader_get_uint8_unchecked (reader);
500 msg->log_message_interval = gst_byte_reader_get_uint8_unchecked (reader);
505 /* IEEE 1588-2008 13.5 */
507 parse_ptp_message_announce (PtpMessage * msg, GstByteReader * reader)
509 g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_ANNOUNCE, FALSE);
511 if (gst_byte_reader_get_remaining (reader) < 20)
514 if (!parse_ptp_timestamp (&msg->message_specific.announce.origin_timestamp,
518 msg->message_specific.announce.current_utc_offset =
519 gst_byte_reader_get_uint16_be_unchecked (reader);
520 gst_byte_reader_skip_unchecked (reader, 1);
522 msg->message_specific.announce.grandmaster_priority_1 =
523 gst_byte_reader_get_uint8_unchecked (reader);
524 msg->message_specific.announce.grandmaster_clock_quality.clock_class =
525 gst_byte_reader_get_uint8_unchecked (reader);
526 msg->message_specific.announce.grandmaster_clock_quality.clock_accuracy =
527 gst_byte_reader_get_uint8_unchecked (reader);
528 msg->message_specific.announce.
529 grandmaster_clock_quality.offset_scaled_log_variance =
530 gst_byte_reader_get_uint16_be_unchecked (reader);
531 msg->message_specific.announce.grandmaster_priority_2 =
532 gst_byte_reader_get_uint8_unchecked (reader);
533 msg->message_specific.announce.grandmaster_identity =
534 gst_byte_reader_get_uint64_be_unchecked (reader);
535 msg->message_specific.announce.steps_removed =
536 gst_byte_reader_get_uint16_be_unchecked (reader);
537 msg->message_specific.announce.time_source =
538 gst_byte_reader_get_uint8_unchecked (reader);
543 /* IEEE 1588-2008 13.6 */
545 parse_ptp_message_sync (PtpMessage * msg, GstByteReader * reader)
547 g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_SYNC, FALSE);
549 if (gst_byte_reader_get_remaining (reader) < 10)
552 if (!parse_ptp_timestamp (&msg->message_specific.sync.origin_timestamp,
559 /* IEEE 1588-2008 13.6 */
561 parse_ptp_message_delay_req (PtpMessage * msg, GstByteReader * reader)
563 g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_DELAY_REQ, FALSE);
565 if (gst_byte_reader_get_remaining (reader) < 10)
568 if (!parse_ptp_timestamp (&msg->message_specific.delay_req.origin_timestamp,
575 /* IEEE 1588-2008 13.7 */
577 parse_ptp_message_follow_up (PtpMessage * msg, GstByteReader * reader)
579 g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_FOLLOW_UP, FALSE);
581 if (gst_byte_reader_get_remaining (reader) < 10)
584 if (!parse_ptp_timestamp (&msg->message_specific.
585 follow_up.precise_origin_timestamp, reader))
591 /* IEEE 1588-2008 13.8 */
593 parse_ptp_message_delay_resp (PtpMessage * msg, GstByteReader * reader)
595 g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_DELAY_RESP,
598 if (gst_byte_reader_get_remaining (reader) < 20)
601 if (!parse_ptp_timestamp (&msg->message_specific.delay_resp.receive_timestamp,
605 msg->message_specific.delay_resp.requesting_port_identity.clock_identity =
606 gst_byte_reader_get_uint64_be_unchecked (reader);
607 msg->message_specific.delay_resp.requesting_port_identity.port_number =
608 gst_byte_reader_get_uint16_be_unchecked (reader);
614 parse_ptp_message (PtpMessage * msg, const guint8 * data, gsize size)
616 GstByteReader reader;
617 gboolean ret = FALSE;
619 gst_byte_reader_init (&reader, data, size);
621 if (!parse_ptp_message_header (msg, &reader)) {
622 GST_WARNING ("Failed to parse PTP message header");
626 switch (msg->message_type) {
627 case PTP_MESSAGE_TYPE_SYNC:
628 ret = parse_ptp_message_sync (msg, &reader);
630 case PTP_MESSAGE_TYPE_FOLLOW_UP:
631 ret = parse_ptp_message_follow_up (msg, &reader);
633 case PTP_MESSAGE_TYPE_DELAY_REQ:
634 ret = parse_ptp_message_delay_req (msg, &reader);
636 case PTP_MESSAGE_TYPE_DELAY_RESP:
637 ret = parse_ptp_message_delay_resp (msg, &reader);
639 case PTP_MESSAGE_TYPE_ANNOUNCE:
640 ret = parse_ptp_message_announce (msg, &reader);
651 compare_announce_message (const PtpAnnounceMessage * a,
652 const PtpAnnounceMessage * b)
654 /* IEEE 1588 Figure 27 */
655 if (a->grandmaster_identity == b->grandmaster_identity) {
656 if (a->steps_removed + 1 < b->steps_removed)
658 else if (a->steps_removed > b->steps_removed + 1)
661 /* Error cases are filtered out earlier */
662 if (a->steps_removed < b->steps_removed)
664 else if (a->steps_removed > b->steps_removed)
667 /* Error cases are filtered out earlier */
668 if (a->master_clock_identity.clock_identity <
669 b->master_clock_identity.clock_identity)
671 else if (a->master_clock_identity.clock_identity >
672 b->master_clock_identity.clock_identity)
675 /* Error cases are filtered out earlier */
676 if (a->master_clock_identity.port_number <
677 b->master_clock_identity.port_number)
679 else if (a->master_clock_identity.port_number >
680 b->master_clock_identity.port_number)
683 g_assert_not_reached ();
688 if (a->grandmaster_priority_1 < b->grandmaster_priority_1)
690 else if (a->grandmaster_priority_1 > b->grandmaster_priority_1)
693 if (a->grandmaster_clock_quality.clock_class <
694 b->grandmaster_clock_quality.clock_class)
696 else if (a->grandmaster_clock_quality.clock_class >
697 b->grandmaster_clock_quality.clock_class)
700 if (a->grandmaster_clock_quality.clock_accuracy <
701 b->grandmaster_clock_quality.clock_accuracy)
703 else if (a->grandmaster_clock_quality.clock_accuracy >
704 b->grandmaster_clock_quality.clock_accuracy)
707 if (a->grandmaster_clock_quality.offset_scaled_log_variance <
708 b->grandmaster_clock_quality.offset_scaled_log_variance)
710 else if (a->grandmaster_clock_quality.offset_scaled_log_variance >
711 b->grandmaster_clock_quality.offset_scaled_log_variance)
714 if (a->grandmaster_priority_2 < b->grandmaster_priority_2)
716 else if (a->grandmaster_priority_2 > b->grandmaster_priority_2)
719 if (a->grandmaster_identity < b->grandmaster_identity)
721 else if (a->grandmaster_identity > b->grandmaster_identity)
724 g_assert_not_reached ();
730 select_best_master_clock (PtpDomainData * domain, GstClockTime now)
732 GList *qualified_messages = NULL;
734 PtpAnnounceMessage *best = NULL;
736 /* IEEE 1588 9.3.2.5 */
737 for (l = domain->announce_senders; l; l = l->next) {
738 PtpAnnounceSender *sender = l->data;
739 GstClockTime window = 4 * sender->announce_interval;
742 for (m = sender->announce_messages.head; m; m = m->next) {
743 PtpAnnounceMessage *msg = m->data;
745 if (now - msg->receive_time <= window)
749 /* Only include the newest message of announce senders that had at least 2
750 * announce messages in the last 4 announce intervals. Which also means
751 * that we wait at least 4 announce intervals before we select a master
752 * clock. Until then we just report based on the newest SYNC we received
756 g_list_prepend (qualified_messages,
757 g_queue_peek_tail (&sender->announce_messages));
761 if (!qualified_messages) {
763 ("No qualified announce messages for domain %u, can't select a master clock",
765 domain->have_master_clock = FALSE;
769 for (l = qualified_messages; l; l = l->next) {
770 PtpAnnounceMessage *msg = l->data;
772 if (!best || compare_announce_message (msg, best) < 0)
776 if (domain->have_master_clock
777 && compare_clock_identity (&domain->master_clock_identity,
778 &best->master_clock_identity) == 0) {
779 GST_DEBUG ("Master clock in domain %u did not change", domain->domain);
781 GST_DEBUG ("Selected master clock for domain %u: 0x%016" G_GINT64_MODIFIER
782 "x %u with grandmaster clock 0x%016" G_GINT64_MODIFIER "x",
783 domain->domain, best->master_clock_identity.clock_identity,
784 best->master_clock_identity.port_number, best->grandmaster_identity);
786 domain->have_master_clock = TRUE;
787 domain->grandmaster_identity = best->grandmaster_identity;
789 /* Opportunistic master clock selection likely gave us the same master
790 * clock before, no need to reset all statistics */
791 if (compare_clock_identity (&domain->master_clock_identity,
792 &best->master_clock_identity) != 0) {
793 memcpy (&domain->master_clock_identity, &best->master_clock_identity,
794 sizeof (PtpClockIdentity));
795 domain->mean_path_delay = 0;
796 domain->last_delay_req = 0;
797 domain->last_path_delays_missing = 9;
798 domain->min_delay_req_interval = 0;
799 domain->sync_interval = 0;
800 domain->last_ptp_sync_time = 0;
801 domain->skipped_updates = 0;
802 g_queue_foreach (&domain->pending_syncs, (GFunc) ptp_pending_sync_free,
804 g_queue_clear (&domain->pending_syncs);
807 if (g_atomic_int_get (&domain_stats_n_hooks)) {
808 GstStructure *stats =
809 gst_structure_new (GST_PTP_STATISTICS_BEST_MASTER_CLOCK_SELECTED,
810 "domain", G_TYPE_UINT, domain->domain,
811 "master-clock-id", G_TYPE_UINT64,
812 domain->master_clock_identity.clock_identity,
813 "master-clock-port", G_TYPE_UINT,
814 domain->master_clock_identity.port_number,
815 "grandmaster-clock-id", G_TYPE_UINT64, domain->grandmaster_identity,
817 emit_ptp_statistics (domain->domain, stats);
818 gst_structure_free (stats);
824 handle_announce_message (PtpMessage * msg, GstClockTime receive_time)
827 PtpDomainData *domain = NULL;
828 PtpAnnounceSender *sender = NULL;
829 PtpAnnounceMessage *announce;
831 /* IEEE1588 9.3.2.2 e)
832 * Don't consider messages with the alternate master flag set
834 if ((msg->flag_field & 0x0100))
837 /* IEEE 1588 9.3.2.5 d)
838 * Don't consider announce messages with steps_removed>=255
840 if (msg->message_specific.announce.steps_removed >= 255)
843 for (l = domain_data; l; l = l->next) {
844 PtpDomainData *tmp = l->data;
846 if (tmp->domain == msg->domain_number) {
855 domain = g_new0 (PtpDomainData, 1);
856 domain->domain = msg->domain_number;
857 clock_name = g_strdup_printf ("ptp-clock-%u", domain->domain);
858 domain->domain_clock =
859 g_object_new (GST_TYPE_SYSTEM_CLOCK, "name", clock_name, NULL);
861 g_queue_init (&domain->pending_syncs);
862 domain->last_path_delays_missing = 9;
863 domain_data = g_list_prepend (domain_data, domain);
865 g_mutex_lock (&domain_clocks_lock);
866 domain_clocks = g_list_prepend (domain_clocks, domain);
867 g_mutex_unlock (&domain_clocks_lock);
869 if (g_atomic_int_get (&domain_stats_n_hooks)) {
870 GstStructure *stats =
871 gst_structure_new (GST_PTP_STATISTICS_NEW_DOMAIN_FOUND, "domain",
872 G_TYPE_UINT, domain->domain, "clock", GST_TYPE_CLOCK,
873 domain->domain_clock, NULL);
874 emit_ptp_statistics (domain->domain, stats);
875 gst_structure_free (stats);
879 for (l = domain->announce_senders; l; l = l->next) {
880 PtpAnnounceSender *tmp = l->data;
882 if (compare_clock_identity (&tmp->master_clock_identity,
883 &msg->source_port_identity) == 0) {
890 sender = g_new0 (PtpAnnounceSender, 1);
892 memcpy (&sender->master_clock_identity, &msg->source_port_identity,
893 sizeof (PtpClockIdentity));
894 g_queue_init (&sender->announce_messages);
895 domain->announce_senders =
896 g_list_prepend (domain->announce_senders, sender);
899 for (l = sender->announce_messages.head; l; l = l->next) {
900 PtpAnnounceMessage *tmp = l->data;
902 /* IEEE 1588 9.3.2.5 c)
903 * Don't consider identical messages, i.e. duplicates
905 if (tmp->sequence_id == msg->sequence_id)
909 sender->announce_interval = log2_to_clock_time (msg->log_message_interval);
911 announce = g_new0 (PtpAnnounceMessage, 1);
912 announce->receive_time = receive_time;
913 announce->sequence_id = msg->sequence_id;
914 memcpy (&announce->master_clock_identity, &msg->source_port_identity,
915 sizeof (PtpClockIdentity));
916 announce->grandmaster_identity =
917 msg->message_specific.announce.grandmaster_identity;
918 announce->grandmaster_priority_1 =
919 msg->message_specific.announce.grandmaster_priority_1;
920 announce->grandmaster_clock_quality.clock_class =
921 msg->message_specific.announce.grandmaster_clock_quality.clock_class;
922 announce->grandmaster_clock_quality.clock_accuracy =
923 msg->message_specific.announce.grandmaster_clock_quality.clock_accuracy;
924 announce->grandmaster_clock_quality.offset_scaled_log_variance =
925 msg->message_specific.announce.
926 grandmaster_clock_quality.offset_scaled_log_variance;
927 announce->grandmaster_priority_2 =
928 msg->message_specific.announce.grandmaster_priority_2;
929 announce->steps_removed = msg->message_specific.announce.steps_removed;
930 announce->time_source = msg->message_specific.announce.time_source;
931 g_queue_push_tail (&sender->announce_messages, announce);
933 select_best_master_clock (domain, receive_time);
937 send_delay_req_timeout (PtpPendingSync * sync)
939 StdIOHeader header = { 0, };
940 guint8 delay_req[44];
941 GstByteWriter writer;
946 header.type = TYPE_EVENT;
949 gst_byte_writer_init_with_data (&writer, delay_req, 44, FALSE);
950 gst_byte_writer_put_uint8_unchecked (&writer, PTP_MESSAGE_TYPE_DELAY_REQ);
951 gst_byte_writer_put_uint8_unchecked (&writer, 2);
952 gst_byte_writer_put_uint16_be_unchecked (&writer, 44);
953 gst_byte_writer_put_uint8_unchecked (&writer, sync->domain);
954 gst_byte_writer_put_uint8_unchecked (&writer, 0);
955 gst_byte_writer_put_uint16_be_unchecked (&writer, 0);
956 gst_byte_writer_put_uint64_be_unchecked (&writer, 0);
957 gst_byte_writer_put_uint32_be_unchecked (&writer, 0);
958 gst_byte_writer_put_uint64_be_unchecked (&writer,
959 ptp_clock_id.clock_identity);
960 gst_byte_writer_put_uint16_be_unchecked (&writer, ptp_clock_id.port_number);
961 gst_byte_writer_put_uint16_be_unchecked (&writer, sync->delay_req_seqnum);
962 gst_byte_writer_put_uint8_unchecked (&writer, 0x01);
963 gst_byte_writer_put_uint8_unchecked (&writer, 0x7f);
964 gst_byte_writer_put_uint64_be_unchecked (&writer, 0);
965 gst_byte_writer_put_uint16_be_unchecked (&writer, 0);
968 g_io_channel_write_chars (stdout_channel, (gchar *) & header,
969 sizeof (header), &written, &err);
970 if (status == G_IO_STATUS_ERROR) {
971 g_warning ("Failed to write to stdout: %s", err->message);
972 g_clear_error (&err);
973 return G_SOURCE_REMOVE;
974 } else if (status == G_IO_STATUS_EOF) {
975 g_message ("EOF on stdout");
976 g_main_loop_quit (main_loop);
977 return G_SOURCE_REMOVE;
978 } else if (status != G_IO_STATUS_NORMAL) {
979 g_warning ("Unexpected stdout write status: %d", status);
980 g_main_loop_quit (main_loop);
981 return G_SOURCE_REMOVE;
982 } else if (written != sizeof (header)) {
983 g_warning ("Unexpected write size: %" G_GSIZE_FORMAT, written);
984 g_main_loop_quit (main_loop);
985 return G_SOURCE_REMOVE;
988 sync->delay_req_send_time_local =
989 gst_clock_get_time (observation_system_clock);
992 g_io_channel_write_chars (stdout_channel,
993 (const gchar *) delay_req, 44, &written, &err);
994 if (status == G_IO_STATUS_ERROR) {
995 g_warning ("Failed to write to stdout: %s", err->message);
996 g_clear_error (&err);
997 g_main_loop_quit (main_loop);
998 return G_SOURCE_REMOVE;
999 } else if (status == G_IO_STATUS_EOF) {
1000 g_message ("EOF on stdout");
1001 g_main_loop_quit (main_loop);
1002 return G_SOURCE_REMOVE;
1003 } else if (status != G_IO_STATUS_NORMAL) {
1004 g_warning ("Unexpected stdout write status: %d", status);
1005 g_main_loop_quit (main_loop);
1006 return G_SOURCE_REMOVE;
1007 } else if (written != 44) {
1008 g_warning ("Unexpected write size: %" G_GSIZE_FORMAT, written);
1009 g_main_loop_quit (main_loop);
1010 return G_SOURCE_REMOVE;
1013 return G_SOURCE_REMOVE;
1017 send_delay_req (PtpDomainData * domain, PtpPendingSync * sync)
1019 GstClockTime now = gst_clock_get_time (observation_system_clock);
1021 GSource *timeout_source;
1023 if (domain->last_delay_req != 0
1024 && domain->last_delay_req + domain->min_delay_req_interval > now)
1027 domain->last_delay_req = now;
1028 sync->delay_req_seqnum = domain->last_delay_req_seqnum++;
1030 /* IEEE 1588 9.5.11.2 */
1031 if (domain->last_delay_req == 0 || domain->min_delay_req_interval == 0)
1035 g_rand_int_range (delay_req_rand, 0,
1036 (domain->min_delay_req_interval * 2) / GST_MSECOND);
1038 sync->timeout_source = timeout_source = g_timeout_source_new (timeout);
1039 g_source_set_priority (timeout_source, G_PRIORITY_DEFAULT);
1040 g_source_set_callback (timeout_source, (GSourceFunc) send_delay_req_timeout,
1042 g_source_attach (timeout_source, main_context);
1047 /* Filtering of outliers for RTT and time calculations inspired
1048 * by the code from gstnetclientclock.c
1051 update_ptp_time (PtpDomainData * domain, PtpPendingSync * sync)
1053 GstClockTime internal_time, external_time, rate_num, rate_den;
1054 GstClockTime corrected_ptp_time, corrected_local_time;
1055 gdouble r_squared = 0.0;
1057 GstClockTimeDiff discont = 0;
1058 GstClockTime estimated_ptp_time = GST_CLOCK_TIME_NONE;
1059 #ifdef USE_MEASUREMENT_FILTERING
1060 GstClockTime orig_internal_time, orig_external_time, orig_rate_num,
1062 GstClockTime new_estimated_ptp_time;
1063 GstClockTime max_discont, estimated_ptp_time_min, estimated_ptp_time_max;
1064 gboolean now_synced;
1067 #ifdef USE_ONLY_SYNC_WITH_DELAY
1068 GstClockTime mean_path_delay;
1070 if (sync->delay_req_send_time_local == GST_CLOCK_TIME_NONE)
1073 /* IEEE 1588 11.3 */
1075 (sync->delay_req_recv_time_remote - sync->sync_send_time_remote +
1076 sync->sync_recv_time_local - sync->delay_req_send_time_local -
1077 (sync->correction_field_sync + sync->correction_field_delay +
1078 32768) / 65536) / 2;
1081 /* IEEE 1588 11.2 */
1082 corrected_ptp_time =
1083 sync->sync_send_time_remote +
1084 (sync->correction_field_sync + 32768) / 65536;
1086 #ifdef USE_ONLY_SYNC_WITH_DELAY
1087 corrected_local_time = sync->sync_recv_time_local - mean_path_delay;
1089 corrected_local_time = sync->sync_recv_time_local - domain->mean_path_delay;
1092 #ifdef USE_MEASUREMENT_FILTERING
1093 /* We check this here and when updating the mean path delay, because
1094 * we can get here without a delay response too */
1095 if (sync->follow_up_recv_time_local != GST_CLOCK_TIME_NONE
1096 && sync->follow_up_recv_time_local >
1097 sync->sync_recv_time_local + 2 * domain->mean_path_delay) {
1098 GST_WARNING ("Sync-follow-up delay for domain %u too big: %" GST_TIME_FORMAT
1099 " > 2 * %" GST_TIME_FORMAT, domain->domain,
1100 GST_TIME_ARGS (sync->follow_up_recv_time_local),
1101 GST_TIME_ARGS (domain->mean_path_delay));
1103 gst_clock_get_calibration (GST_CLOCK_CAST (domain->domain_clock),
1104 &internal_time, &external_time, &rate_num, &rate_den);
1109 /* Set an initial local-remote relation */
1110 if (domain->last_ptp_time == 0)
1111 gst_clock_set_calibration (domain->domain_clock, corrected_local_time,
1112 corrected_ptp_time, 1, 1);
1114 #ifdef USE_MEASUREMENT_FILTERING
1115 /* Check if the corrected PTP time is +/- 3/4 RTT around what we would
1116 * estimate with our present knowledge about the clock
1118 /* Store what the clock produced as 'now' before this update */
1119 gst_clock_get_calibration (GST_CLOCK_CAST (domain->domain_clock),
1120 &orig_internal_time, &orig_external_time, &orig_rate_num, &orig_rate_den);
1121 internal_time = orig_internal_time;
1122 external_time = orig_external_time;
1123 rate_num = orig_rate_num;
1124 rate_den = orig_rate_den;
1126 /* 3/4 RTT window around the estimation */
1127 max_discont = domain->mean_path_delay * 3 / 2;
1129 /* Check if the estimated sync time is inside our window */
1130 estimated_ptp_time_min = corrected_local_time - max_discont;
1131 estimated_ptp_time_min =
1132 gst_clock_adjust_with_calibration (GST_CLOCK_CAST (domain->domain_clock),
1133 estimated_ptp_time_min, internal_time, external_time, rate_num, rate_den);
1134 estimated_ptp_time_max = corrected_local_time + max_discont;
1135 estimated_ptp_time_max =
1136 gst_clock_adjust_with_calibration (GST_CLOCK_CAST (domain->domain_clock),
1137 estimated_ptp_time_max, internal_time, external_time, rate_num, rate_den);
1139 synced = (estimated_ptp_time_min < corrected_ptp_time
1140 && corrected_ptp_time < estimated_ptp_time_max);
1142 GST_DEBUG ("Adding observation for domain %u: %" GST_TIME_FORMAT " - %"
1143 GST_TIME_FORMAT, domain->domain,
1144 GST_TIME_ARGS (corrected_ptp_time), GST_TIME_ARGS (corrected_local_time));
1146 GST_DEBUG ("Synced %d: %" GST_TIME_FORMAT " < %" GST_TIME_FORMAT " < %"
1147 GST_TIME_FORMAT, synced, GST_TIME_ARGS (estimated_ptp_time_min),
1148 GST_TIME_ARGS (corrected_ptp_time),
1149 GST_TIME_ARGS (estimated_ptp_time_max));
1151 if (gst_clock_add_observation_unapplied (domain->domain_clock,
1152 corrected_local_time, corrected_ptp_time, &r_squared,
1153 &internal_time, &external_time, &rate_num, &rate_den)) {
1154 GST_DEBUG ("Regression gave r_squared: %f", r_squared);
1156 /* Old estimated PTP time based on receive time and path delay */
1157 estimated_ptp_time = corrected_local_time;
1158 estimated_ptp_time =
1159 gst_clock_adjust_with_calibration (GST_CLOCK_CAST
1160 (domain->domain_clock), estimated_ptp_time, orig_internal_time,
1161 orig_external_time, orig_rate_num, orig_rate_den);
1163 /* New estimated PTP time based on receive time and path delay */
1164 new_estimated_ptp_time = corrected_local_time;
1165 new_estimated_ptp_time =
1166 gst_clock_adjust_with_calibration (GST_CLOCK_CAST
1167 (domain->domain_clock), new_estimated_ptp_time, internal_time,
1168 external_time, rate_num, rate_den);
1170 discont = GST_CLOCK_DIFF (estimated_ptp_time, new_estimated_ptp_time);
1171 if (synced && ABS (discont) > max_discont) {
1172 GstClockTimeDiff offset;
1173 GST_DEBUG ("Too large a discont %s%" GST_TIME_FORMAT
1174 ", clamping to 1/4 average RTT = %" GST_TIME_FORMAT,
1175 (discont < 0 ? "-" : ""), GST_TIME_ARGS (ABS (discont)),
1176 GST_TIME_ARGS (max_discont));
1177 if (discont > 0) { /* Too large a forward step - add a -ve offset */
1178 offset = max_discont - discont;
1179 if (-offset > external_time)
1182 external_time += offset;
1183 } else { /* Too large a backward step - add a +ve offset */
1184 offset = -(max_discont + discont);
1185 external_time += offset;
1190 GST_DEBUG ("Discont %s%" GST_TIME_FORMAT " (max: %" GST_TIME_FORMAT ")",
1191 (discont < 0 ? "-" : ""), GST_TIME_ARGS (ABS (discont)),
1192 GST_TIME_ARGS (max_discont));
1195 /* Check if the estimated sync time is now (still) inside our window */
1196 estimated_ptp_time_min = corrected_local_time - max_discont;
1197 estimated_ptp_time_min =
1198 gst_clock_adjust_with_calibration (GST_CLOCK_CAST
1199 (domain->domain_clock), estimated_ptp_time_min, internal_time,
1200 external_time, rate_num, rate_den);
1201 estimated_ptp_time_max = corrected_local_time + max_discont;
1202 estimated_ptp_time_max =
1203 gst_clock_adjust_with_calibration (GST_CLOCK_CAST
1204 (domain->domain_clock), estimated_ptp_time_max, internal_time,
1205 external_time, rate_num, rate_den);
1207 now_synced = (estimated_ptp_time_min < corrected_ptp_time
1208 && corrected_ptp_time < estimated_ptp_time_max);
1210 GST_DEBUG ("Now synced %d: %" GST_TIME_FORMAT " < %" GST_TIME_FORMAT " < %"
1211 GST_TIME_FORMAT, now_synced, GST_TIME_ARGS (estimated_ptp_time_min),
1212 GST_TIME_ARGS (corrected_ptp_time),
1213 GST_TIME_ARGS (estimated_ptp_time_max));
1215 if (synced || now_synced || domain->skipped_updates > MAX_SKIPPED_UPDATES) {
1216 gst_clock_set_calibration (GST_CLOCK_CAST (domain->domain_clock),
1217 internal_time, external_time, rate_num, rate_den);
1218 domain->skipped_updates = 0;
1220 domain->last_ptp_time = corrected_ptp_time;
1221 domain->last_local_time = corrected_local_time;
1223 domain->skipped_updates++;
1226 domain->last_ptp_time = corrected_ptp_time;
1227 domain->last_local_time = corrected_local_time;
1231 GST_DEBUG ("Adding observation for domain %u: %" GST_TIME_FORMAT " - %"
1232 GST_TIME_FORMAT, domain->domain,
1233 GST_TIME_ARGS (corrected_ptp_time), GST_TIME_ARGS (corrected_local_time));
1235 gst_clock_get_calibration (GST_CLOCK_CAST (domain->domain_clock),
1236 &internal_time, &external_time, &rate_num, &rate_den);
1238 estimated_ptp_time = corrected_local_time;
1239 estimated_ptp_time =
1240 gst_clock_adjust_with_calibration (GST_CLOCK_CAST
1241 (domain->domain_clock), estimated_ptp_time, internal_time,
1242 external_time, rate_num, rate_den);
1244 gst_clock_add_observation (domain->domain_clock,
1245 corrected_local_time, corrected_ptp_time, &r_squared);
1247 gst_clock_get_calibration (GST_CLOCK_CAST (domain->domain_clock),
1248 &internal_time, &external_time, &rate_num, &rate_den);
1251 domain->last_ptp_time = corrected_ptp_time;
1252 domain->last_local_time = corrected_local_time;
1255 #ifdef USE_MEASUREMENT_FILTERING
1258 if (g_atomic_int_get (&domain_stats_n_hooks)) {
1259 GstStructure *stats = gst_structure_new (GST_PTP_STATISTICS_TIME_UPDATED,
1260 "domain", G_TYPE_UINT, domain->domain,
1261 "mean-path-delay-avg", GST_TYPE_CLOCK_TIME, domain->mean_path_delay,
1262 "local-time", GST_TYPE_CLOCK_TIME, corrected_local_time,
1263 "ptp-time", GST_TYPE_CLOCK_TIME, corrected_ptp_time,
1264 "estimated-ptp-time", GST_TYPE_CLOCK_TIME, estimated_ptp_time,
1265 "discontinuity", G_TYPE_INT64, discont,
1266 "synced", G_TYPE_BOOLEAN, synced,
1267 "r-squared", G_TYPE_DOUBLE, r_squared,
1268 "internal-time", GST_TYPE_CLOCK_TIME, internal_time,
1269 "external-time", GST_TYPE_CLOCK_TIME, external_time,
1270 "rate-num", G_TYPE_UINT64, rate_num,
1271 "rate-den", G_TYPE_UINT64, rate_den,
1272 "rate", G_TYPE_DOUBLE, (gdouble) (rate_num) / rate_den,
1274 emit_ptp_statistics (domain->domain, stats);
1275 gst_structure_free (stats);
1280 #ifdef USE_MEDIAN_PRE_FILTERING
1282 compare_clock_time (const GstClockTime * a, const GstClockTime * b)
1293 update_mean_path_delay (PtpDomainData * domain, PtpPendingSync * sync)
1295 #ifdef USE_MEDIAN_PRE_FILTERING
1296 GstClockTime last_path_delays[MEDIAN_PRE_FILTERING_WINDOW];
1297 GstClockTime median;
1301 GstClockTime mean_path_delay, delay_req_delay = 0;
1304 /* IEEE 1588 11.3 */
1306 (sync->delay_req_recv_time_remote - sync->sync_send_time_remote +
1307 sync->sync_recv_time_local - sync->delay_req_send_time_local -
1308 (sync->correction_field_sync + sync->correction_field_delay +
1309 32768) / 65536) / 2;
1311 #ifdef USE_MEDIAN_PRE_FILTERING
1312 for (i = 1; i < MEDIAN_PRE_FILTERING_WINDOW; i++)
1313 domain->last_path_delays[i - 1] = domain->last_path_delays[i];
1314 domain->last_path_delays[i - 1] = mean_path_delay;
1316 if (domain->last_path_delays_missing) {
1317 domain->last_path_delays_missing--;
1319 memcpy (&last_path_delays, &domain->last_path_delays,
1320 sizeof (last_path_delays));
1321 g_qsort_with_data (&last_path_delays,
1322 MEDIAN_PRE_FILTERING_WINDOW, sizeof (GstClockTime),
1323 (GCompareDataFunc) compare_clock_time, NULL);
1325 median = last_path_delays[MEDIAN_PRE_FILTERING_WINDOW / 2];
1327 /* FIXME: We might want to use something else here, like only allowing
1328 * things in the interquartile range, or also filtering away delays that
1329 * are too small compared to the median. This here worked well enough
1332 if (mean_path_delay > 2 * median) {
1333 GST_WARNING ("Path delay for domain %u too big compared to median: %"
1334 GST_TIME_FORMAT " > 2 * %" GST_TIME_FORMAT, domain->domain,
1335 GST_TIME_ARGS (mean_path_delay), GST_TIME_ARGS (median));
1342 #ifdef USE_RUNNING_AVERAGE_DELAY
1343 /* Track an average round trip time, for a bit of smoothing */
1344 /* Always update before discarding a sample, so genuine changes in
1345 * the network get picked up, eventually */
1346 if (domain->mean_path_delay == 0)
1347 domain->mean_path_delay = mean_path_delay;
1348 else if (mean_path_delay < domain->mean_path_delay) /* Shorter RTTs carry more weight than longer */
1349 domain->mean_path_delay =
1350 (3 * domain->mean_path_delay + mean_path_delay) / 4;
1352 domain->mean_path_delay =
1353 (15 * domain->mean_path_delay + mean_path_delay) / 16;
1355 domain->mean_path_delay = mean_path_delay;
1358 #ifdef USE_MEASUREMENT_FILTERING
1359 if (sync->follow_up_recv_time_local != GST_CLOCK_TIME_NONE &&
1360 domain->mean_path_delay != 0
1361 && sync->follow_up_recv_time_local >
1362 sync->sync_recv_time_local + 2 * domain->mean_path_delay) {
1363 GST_WARNING ("Sync-follow-up delay for domain %u too big: %" GST_TIME_FORMAT
1364 " > 2 * %" GST_TIME_FORMAT, domain->domain,
1365 GST_TIME_ARGS (sync->follow_up_recv_time_local -
1366 sync->sync_recv_time_local),
1367 GST_TIME_ARGS (domain->mean_path_delay));
1372 if (mean_path_delay > 2 * domain->mean_path_delay) {
1373 GST_WARNING ("Mean path delay for domain %u too big: %" GST_TIME_FORMAT
1374 " > 2 * %" GST_TIME_FORMAT, domain->domain,
1375 GST_TIME_ARGS (mean_path_delay),
1376 GST_TIME_ARGS (domain->mean_path_delay));
1383 sync->delay_resp_recv_time_local - sync->delay_req_send_time_local;
1385 #ifdef USE_MEASUREMENT_FILTERING
1386 /* delay_req_delay is a RTT, so 2 times the path delay */
1387 if (delay_req_delay > 4 * domain->mean_path_delay) {
1388 GST_WARNING ("Delay-request-response delay for domain %u too big: %"
1389 GST_TIME_FORMAT " > 4 * %" GST_TIME_FORMAT, domain->domain,
1390 GST_TIME_ARGS (delay_req_delay),
1391 GST_TIME_ARGS (domain->mean_path_delay));
1399 GST_DEBUG ("Got mean path delay for domain %u: %" GST_TIME_FORMAT " (new: %"
1400 GST_TIME_FORMAT ")", domain->domain,
1401 GST_TIME_ARGS (domain->mean_path_delay), GST_TIME_ARGS (mean_path_delay));
1402 GST_DEBUG ("Delay request delay for domain %u: %" GST_TIME_FORMAT,
1403 domain->domain, GST_TIME_ARGS (delay_req_delay));
1405 #ifdef USE_MEASUREMENT_FILTERING
1408 if (g_atomic_int_get (&domain_stats_n_hooks)) {
1409 GstStructure *stats =
1410 gst_structure_new (GST_PTP_STATISTICS_PATH_DELAY_MEASURED,
1411 "domain", G_TYPE_UINT, domain->domain,
1412 "mean-path-delay-avg", GST_TYPE_CLOCK_TIME, domain->mean_path_delay,
1413 "mean-path-delay", GST_TYPE_CLOCK_TIME, mean_path_delay,
1414 "delay-request-delay", GST_TYPE_CLOCK_TIME, delay_req_delay, NULL);
1415 emit_ptp_statistics (domain->domain, stats);
1416 gst_structure_free (stats);
1423 handle_sync_message (PtpMessage * msg, GstClockTime receive_time)
1426 PtpDomainData *domain = NULL;
1427 PtpPendingSync *sync = NULL;
1429 /* Don't consider messages with the alternate master flag set */
1430 if ((msg->flag_field & 0x0100))
1433 for (l = domain_data; l; l = l->next) {
1434 PtpDomainData *tmp = l->data;
1436 if (msg->domain_number == tmp->domain) {
1445 domain = g_new0 (PtpDomainData, 1);
1446 domain->domain = msg->domain_number;
1447 clock_name = g_strdup_printf ("ptp-clock-%u", domain->domain);
1448 domain->domain_clock =
1449 g_object_new (GST_TYPE_SYSTEM_CLOCK, "name", clock_name, NULL);
1450 g_free (clock_name);
1451 g_queue_init (&domain->pending_syncs);
1452 domain->last_path_delays_missing = 9;
1453 domain_data = g_list_prepend (domain_data, domain);
1455 g_mutex_lock (&domain_clocks_lock);
1456 domain_clocks = g_list_prepend (domain_clocks, domain);
1457 g_mutex_unlock (&domain_clocks_lock);
1460 /* If we have a master clock, ignore this message if it's not coming from there */
1461 if (domain->have_master_clock
1462 && compare_clock_identity (&domain->master_clock_identity,
1463 &msg->source_port_identity) != 0)
1466 #ifdef USE_OPPORTUNISTIC_CLOCK_SELECTION
1467 /* Opportunistic selection of master clock */
1468 if (!domain->have_master_clock)
1469 memcpy (&domain->master_clock_identity, &msg->source_port_identity,
1470 sizeof (PtpClockIdentity));
1472 if (!domain->have_master_clock)
1476 domain->sync_interval = log2_to_clock_time (msg->log_message_interval);
1478 /* Check if duplicated */
1479 for (l = domain->pending_syncs.head; l; l = l->next) {
1480 PtpPendingSync *tmp = l->data;
1482 if (tmp->sync_seqnum == msg->sequence_id)
1486 if (msg->message_specific.sync.origin_timestamp.seconds_field >
1487 GST_CLOCK_TIME_NONE / GST_SECOND) {
1488 GST_FIXME ("Unsupported sync message seconds field value: %"
1489 G_GUINT64_FORMAT " > %" G_GUINT64_FORMAT,
1490 msg->message_specific.sync.origin_timestamp.seconds_field,
1491 GST_CLOCK_TIME_NONE / GST_SECOND);
1495 sync = g_new0 (PtpPendingSync, 1);
1496 sync->domain = domain->domain;
1497 sync->sync_seqnum = msg->sequence_id;
1498 sync->sync_recv_time_local = receive_time;
1499 sync->sync_send_time_remote = GST_CLOCK_TIME_NONE;
1500 sync->follow_up_recv_time_local = GST_CLOCK_TIME_NONE;
1501 sync->delay_req_send_time_local = GST_CLOCK_TIME_NONE;
1502 sync->delay_req_recv_time_remote = GST_CLOCK_TIME_NONE;
1503 sync->delay_resp_recv_time_local = GST_CLOCK_TIME_NONE;
1505 /* 0.5 correction factor for division later */
1506 sync->correction_field_sync = msg->correction_field;
1508 if ((msg->flag_field & 0x0200)) {
1509 /* Wait for FOLLOW_UP */
1511 sync->sync_send_time_remote =
1512 PTP_TIMESTAMP_TO_GST_CLOCK_TIME (msg->message_specific.
1513 sync.origin_timestamp);
1515 if (domain->last_ptp_sync_time != 0
1516 && domain->last_ptp_sync_time >= sync->sync_send_time_remote) {
1517 GST_WARNING ("Backwards PTP times in domain %u: %" GST_TIME_FORMAT " >= %"
1518 GST_TIME_FORMAT, domain->domain,
1519 GST_TIME_ARGS (domain->last_ptp_sync_time),
1520 GST_TIME_ARGS (sync->sync_send_time_remote));
1521 ptp_pending_sync_free (sync);
1525 domain->last_ptp_sync_time = sync->sync_send_time_remote;
1527 if (send_delay_req (domain, sync)) {
1528 /* Sent delay request */
1530 update_ptp_time (domain, sync);
1531 ptp_pending_sync_free (sync);
1537 g_queue_push_tail (&domain->pending_syncs, sync);
1541 handle_follow_up_message (PtpMessage * msg, GstClockTime receive_time)
1544 PtpDomainData *domain = NULL;
1545 PtpPendingSync *sync = NULL;
1547 /* Don't consider messages with the alternate master flag set */
1548 if ((msg->flag_field & 0x0100))
1551 for (l = domain_data; l; l = l->next) {
1552 PtpDomainData *tmp = l->data;
1554 if (msg->domain_number == tmp->domain) {
1563 /* If we have a master clock, ignore this message if it's not coming from there */
1564 if (domain->have_master_clock
1565 && compare_clock_identity (&domain->master_clock_identity,
1566 &msg->source_port_identity) != 0)
1569 /* Check if we know about this one */
1570 for (l = domain->pending_syncs.head; l; l = l->next) {
1571 PtpPendingSync *tmp = l->data;
1573 if (tmp->sync_seqnum == msg->sequence_id) {
1582 /* Got a FOLLOW_UP for this already */
1583 if (sync->sync_send_time_remote != GST_CLOCK_TIME_NONE)
1586 if (sync->sync_recv_time_local >= receive_time) {
1587 GST_ERROR ("Got bogus follow up in domain %u: %" GST_TIME_FORMAT " > %"
1588 GST_TIME_FORMAT, domain->domain,
1589 GST_TIME_ARGS (sync->sync_recv_time_local),
1590 GST_TIME_ARGS (receive_time));
1591 g_queue_remove (&domain->pending_syncs, sync);
1592 ptp_pending_sync_free (sync);
1596 sync->correction_field_sync += msg->correction_field;
1597 sync->sync_send_time_remote =
1598 PTP_TIMESTAMP_TO_GST_CLOCK_TIME (msg->message_specific.
1599 follow_up.precise_origin_timestamp);
1600 sync->follow_up_recv_time_local = receive_time;
1602 if (domain->last_ptp_sync_time >= sync->sync_send_time_remote) {
1603 GST_WARNING ("Backwards PTP times in domain %u: %" GST_TIME_FORMAT " >= %"
1604 GST_TIME_FORMAT, domain->domain,
1605 GST_TIME_ARGS (domain->last_ptp_sync_time),
1606 GST_TIME_ARGS (sync->sync_send_time_remote));
1607 g_queue_remove (&domain->pending_syncs, sync);
1608 ptp_pending_sync_free (sync);
1612 domain->last_ptp_sync_time = sync->sync_send_time_remote;
1614 if (send_delay_req (domain, sync)) {
1615 /* Sent delay request */
1617 update_ptp_time (domain, sync);
1618 g_queue_remove (&domain->pending_syncs, sync);
1619 ptp_pending_sync_free (sync);
1625 handle_delay_resp_message (PtpMessage * msg, GstClockTime receive_time)
1628 PtpDomainData *domain = NULL;
1629 PtpPendingSync *sync = NULL;
1631 /* Don't consider messages with the alternate master flag set */
1632 if ((msg->flag_field & 0x0100))
1635 for (l = domain_data; l; l = l->next) {
1636 PtpDomainData *tmp = l->data;
1638 if (msg->domain_number == tmp->domain) {
1647 /* If we have a master clock, ignore this message if it's not coming from there */
1648 if (domain->have_master_clock
1649 && compare_clock_identity (&domain->master_clock_identity,
1650 &msg->source_port_identity) != 0)
1654 if (msg->message_specific.delay_resp.
1655 requesting_port_identity.clock_identity != ptp_clock_id.clock_identity
1656 || msg->message_specific.delay_resp.
1657 requesting_port_identity.port_number != ptp_clock_id.port_number)
1660 domain->min_delay_req_interval =
1661 log2_to_clock_time (msg->log_message_interval);
1663 /* Check if we know about this one */
1664 for (l = domain->pending_syncs.head; l; l = l->next) {
1665 PtpPendingSync *tmp = l->data;
1667 if (tmp->delay_req_seqnum == msg->sequence_id) {
1676 /* Got a DELAY_RESP for this already */
1677 if (sync->delay_req_recv_time_remote != GST_CLOCK_TIME_NONE)
1680 if (sync->delay_req_send_time_local > receive_time) {
1681 GST_ERROR ("Got bogus delay response in domain %u: %" GST_TIME_FORMAT " > %"
1682 GST_TIME_FORMAT, domain->domain,
1683 GST_TIME_ARGS (sync->delay_req_send_time_local),
1684 GST_TIME_ARGS (receive_time));
1685 g_queue_remove (&domain->pending_syncs, sync);
1686 ptp_pending_sync_free (sync);
1690 sync->correction_field_delay = msg->correction_field;
1692 sync->delay_req_recv_time_remote =
1693 PTP_TIMESTAMP_TO_GST_CLOCK_TIME (msg->message_specific.
1694 delay_resp.receive_timestamp);
1695 sync->delay_resp_recv_time_local = receive_time;
1697 if (domain->mean_path_delay != 0
1698 && sync->sync_send_time_remote > sync->delay_req_recv_time_remote) {
1699 GST_WARNING ("Sync send time after delay req receive time for domain %u: %"
1700 GST_TIME_FORMAT " > %" GST_TIME_FORMAT, domain->domain,
1701 GST_TIME_ARGS (sync->sync_send_time_remote),
1702 GST_TIME_ARGS (sync->delay_req_recv_time_remote));
1703 g_queue_remove (&domain->pending_syncs, sync);
1704 ptp_pending_sync_free (sync);
1708 if (update_mean_path_delay (domain, sync))
1709 update_ptp_time (domain, sync);
1710 g_queue_remove (&domain->pending_syncs, sync);
1711 ptp_pending_sync_free (sync);
1715 handle_ptp_message (PtpMessage * msg, GstClockTime receive_time)
1717 /* Ignore our own messages */
1718 if (msg->source_port_identity.clock_identity == ptp_clock_id.clock_identity &&
1719 msg->source_port_identity.port_number == ptp_clock_id.port_number)
1722 switch (msg->message_type) {
1723 case PTP_MESSAGE_TYPE_ANNOUNCE:
1724 handle_announce_message (msg, receive_time);
1726 case PTP_MESSAGE_TYPE_SYNC:
1727 handle_sync_message (msg, receive_time);
1729 case PTP_MESSAGE_TYPE_FOLLOW_UP:
1730 handle_follow_up_message (msg, receive_time);
1732 case PTP_MESSAGE_TYPE_DELAY_RESP:
1733 handle_delay_resp_message (msg, receive_time);
1741 have_stdin_data_cb (GIOChannel * channel, GIOCondition condition,
1750 if ((condition & G_IO_STATUS_EOF)) {
1751 GST_ERROR ("Got EOF on stdin");
1752 g_main_loop_quit (main_loop);
1753 return G_SOURCE_REMOVE;
1757 g_io_channel_read_chars (channel, (gchar *) & header, sizeof (header),
1759 if (status == G_IO_STATUS_ERROR) {
1760 GST_ERROR ("Failed to read from stdin: %s", err->message);
1761 g_clear_error (&err);
1762 g_main_loop_quit (main_loop);
1763 return G_SOURCE_REMOVE;
1764 } else if (status == G_IO_STATUS_EOF) {
1765 GST_ERROR ("Got EOF on stdin");
1766 g_main_loop_quit (main_loop);
1767 return G_SOURCE_REMOVE;
1768 } else if (status != G_IO_STATUS_NORMAL) {
1769 GST_ERROR ("Unexpected stdin read status: %d", status);
1770 g_main_loop_quit (main_loop);
1771 return G_SOURCE_REMOVE;
1772 } else if (read != sizeof (header)) {
1773 GST_ERROR ("Unexpected read size: %" G_GSIZE_FORMAT, read);
1774 g_main_loop_quit (main_loop);
1775 return G_SOURCE_REMOVE;
1776 } else if (header.size > 8192) {
1777 GST_ERROR ("Unexpected size: %u", header.size);
1778 g_main_loop_quit (main_loop);
1779 return G_SOURCE_REMOVE;
1782 status = g_io_channel_read_chars (channel, buffer, header.size, &read, &err);
1783 if (status == G_IO_STATUS_ERROR) {
1784 GST_ERROR ("Failed to read from stdin: %s", err->message);
1785 g_clear_error (&err);
1786 g_main_loop_quit (main_loop);
1787 return G_SOURCE_REMOVE;
1788 } else if (status == G_IO_STATUS_EOF) {
1789 GST_ERROR ("EOF on stdin");
1790 g_main_loop_quit (main_loop);
1791 return G_SOURCE_REMOVE;
1792 } else if (status != G_IO_STATUS_NORMAL) {
1793 GST_ERROR ("Unexpected stdin read status: %d", status);
1794 g_main_loop_quit (main_loop);
1795 return G_SOURCE_REMOVE;
1796 } else if (read != header.size) {
1797 GST_ERROR ("Unexpected read size: %" G_GSIZE_FORMAT, read);
1798 g_main_loop_quit (main_loop);
1799 return G_SOURCE_REMOVE;
1802 switch (header.type) {
1805 GstClockTime receive_time = gst_clock_get_time (observation_system_clock);
1808 if (parse_ptp_message (&msg, (const guint8 *) buffer, header.size)) {
1809 dump_ptp_message (&msg);
1810 handle_ptp_message (&msg, receive_time);
1815 case TYPE_CLOCK_ID:{
1816 if (header.size != 8) {
1817 GST_ERROR ("Unexpected clock id size (%u != 8)", header.size);
1818 g_main_loop_quit (main_loop);
1819 return G_SOURCE_REMOVE;
1821 g_mutex_lock (&ptp_lock);
1822 ptp_clock_id.clock_identity = GST_READ_UINT64_BE (buffer);
1823 ptp_clock_id.port_number = getpid ();
1824 GST_DEBUG ("Got clock id 0x%016" G_GINT64_MODIFIER "x %u",
1825 ptp_clock_id.clock_identity, ptp_clock_id.port_number);
1826 g_cond_signal (&ptp_cond);
1827 g_mutex_unlock (&ptp_lock);
1832 return G_SOURCE_CONTINUE;
1835 /* Cleanup all announce messages and announce message senders
1836 * that are timed out by now, and clean up all pending syncs
1837 * that are missing their FOLLOW_UP or DELAY_RESP */
1839 cleanup_cb (gpointer data)
1841 GstClockTime now = gst_clock_get_time (observation_system_clock);
1844 for (l = domain_data; l; l = l->next) {
1845 PtpDomainData *domain = l->data;
1847 for (n = domain->announce_senders; n;) {
1848 PtpAnnounceSender *sender = n->data;
1849 gboolean timed_out = TRUE;
1851 /* Keep only 5 messages per sender around */
1852 while (g_queue_get_length (&sender->announce_messages) > 5) {
1853 PtpAnnounceMessage *msg = g_queue_pop_head (&sender->announce_messages);
1857 for (m = sender->announce_messages.head; m; m = m->next) {
1858 PtpAnnounceMessage *msg = m->data;
1860 if (msg->receive_time +
1861 sender->announce_interval * PTP_ANNOUNCE_RECEIPT_TIMEOUT > now) {
1868 GST_DEBUG ("Announce sender 0x%016" G_GINT64_MODIFIER "x %u timed out",
1869 sender->master_clock_identity.clock_identity,
1870 sender->master_clock_identity.port_number);
1871 g_queue_foreach (&sender->announce_messages, (GFunc) g_free, NULL);
1872 g_queue_clear (&sender->announce_messages);
1875 if (g_queue_get_length (&sender->announce_messages) == 0) {
1876 GList *tmp = n->next;
1878 if (compare_clock_identity (&sender->master_clock_identity,
1879 &domain->master_clock_identity) == 0)
1880 GST_WARNING ("currently selected master clock timed out");
1882 domain->announce_senders =
1883 g_list_delete_link (domain->announce_senders, n);
1889 select_best_master_clock (domain, now);
1891 /* Clean up any pending syncs */
1892 for (n = domain->pending_syncs.head; n;) {
1893 PtpPendingSync *sync = n->data;
1894 gboolean timed_out = FALSE;
1896 /* Time out pending syncs after 4 sync intervals or 10 seconds,
1897 * and pending delay reqs after 4 delay req intervals or 10 seconds
1899 if (sync->delay_req_send_time_local != GST_CLOCK_TIME_NONE &&
1900 ((domain->min_delay_req_interval != 0
1901 && sync->delay_req_send_time_local +
1902 4 * domain->min_delay_req_interval < now)
1903 || (sync->delay_req_send_time_local + 10 * GST_SECOND < now))) {
1905 } else if ((domain->sync_interval != 0
1906 && sync->sync_recv_time_local + 4 * domain->sync_interval < now)
1907 || (sync->sync_recv_time_local + 10 * GST_SECOND < now)) {
1912 GList *tmp = n->next;
1913 ptp_pending_sync_free (sync);
1914 g_queue_delete_link (&domain->pending_syncs, n);
1922 return G_SOURCE_CONTINUE;
1926 ptp_helper_main (gpointer data)
1928 GSource *cleanup_source;
1930 GST_DEBUG ("Starting PTP helper loop");
1932 /* Check all 5 seconds, if we have to cleanup ANNOUNCE or pending syncs message */
1933 cleanup_source = g_timeout_source_new_seconds (5);
1934 g_source_set_priority (cleanup_source, G_PRIORITY_DEFAULT);
1935 g_source_set_callback (cleanup_source, (GSourceFunc) cleanup_cb, NULL, NULL);
1936 g_source_attach (cleanup_source, main_context);
1937 g_source_unref (cleanup_source);
1939 g_main_loop_run (main_loop);
1940 GST_DEBUG ("Stopped PTP helper loop");
1942 g_mutex_lock (&ptp_lock);
1943 ptp_clock_id.clock_identity = GST_PTP_CLOCK_ID_NONE;
1944 ptp_clock_id.port_number = 0;
1946 g_cond_signal (&ptp_cond);
1947 g_mutex_unlock (&ptp_lock);
1953 * gst_ptp_is_supported:
1955 * Check if PTP clocks are generally supported on this system, and if previous
1956 * initializations did not fail.
1958 * Returns: %TRUE if PTP clocks are generally supported on this system, and
1959 * previous initializations did not fail.
1964 gst_ptp_is_supported (void)
1970 * gst_ptp_is_initialized:
1972 * Check if the GStreamer PTP clock subsystem is initialized.
1974 * Returns: %TRUE if the GStreamer PTP clock subsystem is intialized.
1979 gst_ptp_is_initialized (void)
1986 * @clock_id: PTP clock id of this process' clock or %GST_PTP_CLOCK_ID_NONE
1987 * @interfaces: (transfer none) (array zero-terminated=1) (allow-none): network interfaces to run the clock on
1989 * Initialize the GStreamer PTP subsystem and create a PTP ordinary clock in
1990 * slave-only mode for all domains on the given @interfaces with the
1993 * If @clock_id is %GST_PTP_CLOCK_ID_NONE, a clock id is automatically
1994 * generated from the MAC address of the first network interface.
1996 * This function is automatically called by gst_ptp_clock_new() with default
1997 * parameters if it wasn't called before.
1999 * Returns: %TRUE if the GStreamer PTP clock subsystem could be initialized.
2004 gst_ptp_init (guint64 clock_id, gchar ** interfaces)
2008 gchar **argv = NULL;
2012 GSource *stdin_source;
2014 GST_DEBUG_CATEGORY_INIT (ptp_debug, "ptp", 0, "PTP clock");
2016 g_mutex_lock (&ptp_lock);
2018 GST_ERROR ("PTP not supported");
2024 GST_DEBUG ("PTP already initialized");
2029 if (ptp_helper_pid) {
2030 GST_DEBUG ("PTP currently initializing");
2034 if (!domain_stats_hooks_initted) {
2035 g_hook_list_init (&domain_stats_hooks, sizeof (GHook));
2036 domain_stats_hooks_initted = TRUE;
2040 if (clock_id != GST_PTP_CLOCK_ID_NONE)
2042 if (interfaces != NULL)
2043 argc += 2 * g_strv_length (interfaces);
2045 argv = g_new0 (gchar *, argc + 2);
2048 env = g_getenv ("GST_PTP_HELPER_1_0");
2050 env = g_getenv ("GST_PTP_HELPER");
2051 if (env != NULL && *env != '\0') {
2052 GST_LOG ("Trying GST_PTP_HELPER env var: %s", env);
2053 argv[argc_c++] = g_strdup (env);
2055 argv[argc_c++] = g_strdup (GST_PTP_HELPER_INSTALLED);
2058 if (clock_id != GST_PTP_CLOCK_ID_NONE) {
2059 argv[argc_c++] = g_strdup ("-c");
2060 argv[argc_c++] = g_strdup_printf ("0x%016" G_GINT64_MODIFIER "x", clock_id);
2063 if (interfaces != NULL) {
2064 gchar **ptr = interfaces;
2067 argv[argc_c++] = g_strdup ("-i");
2068 argv[argc_c++] = g_strdup (*ptr);
2073 main_context = g_main_context_new ();
2074 main_loop = g_main_loop_new (main_context, FALSE);
2077 g_thread_try_new ("ptp-helper-thread", ptp_helper_main, NULL, &err);
2078 if (!ptp_helper_thread) {
2079 GST_ERROR ("Failed to start PTP helper thread: %s", err->message);
2080 g_clear_error (&err);
2085 if (!g_spawn_async_with_pipes (NULL, argv, NULL, 0, NULL, NULL,
2086 &ptp_helper_pid, &fd_w, &fd_r, NULL, &err)) {
2087 GST_ERROR ("Failed to start ptp helper process: %s", err->message);
2088 g_clear_error (&err);
2094 stdin_channel = g_io_channel_unix_new (fd_r);
2095 g_io_channel_set_encoding (stdin_channel, NULL, NULL);
2096 g_io_channel_set_buffered (stdin_channel, FALSE);
2097 g_io_channel_set_close_on_unref (stdin_channel, TRUE);
2099 g_io_create_watch (stdin_channel, G_IO_IN | G_IO_PRI | G_IO_HUP);
2100 g_source_set_priority (stdin_source, G_PRIORITY_DEFAULT);
2101 g_source_set_callback (stdin_source, (GSourceFunc) have_stdin_data_cb, NULL,
2103 g_source_attach (stdin_source, main_context);
2104 g_source_unref (stdin_source);
2106 /* Create stdout channel */
2107 stdout_channel = g_io_channel_unix_new (fd_w);
2108 g_io_channel_set_encoding (stdout_channel, NULL, NULL);
2109 g_io_channel_set_close_on_unref (stdout_channel, TRUE);
2110 g_io_channel_set_buffered (stdout_channel, FALSE);
2112 delay_req_rand = g_rand_new ();
2113 observation_system_clock =
2114 g_object_new (GST_TYPE_SYSTEM_CLOCK, "name", "ptp-observation-clock",
2120 GST_DEBUG ("Waiting for PTP to be initialized");
2122 while (ptp_clock_id.clock_identity == GST_PTP_CLOCK_ID_NONE && initted)
2123 g_cond_wait (&ptp_cond, &ptp_lock);
2127 GST_DEBUG ("Initialized and got clock id 0x%016" G_GINT64_MODIFIER "x %u",
2128 ptp_clock_id.clock_identity, ptp_clock_id.port_number);
2130 GST_ERROR ("Failed to initialize");
2138 if (ptp_helper_pid) {
2140 kill (ptp_helper_pid, SIGKILL);
2141 waitpid (ptp_helper_pid, NULL, 0);
2143 TerminateProcess (ptp_helper_pid, 1);
2144 WaitForSingleObject (ptp_helper_pid, INFINITE);
2146 g_spawn_close_pid (ptp_helper_pid);
2151 g_io_channel_unref (stdin_channel);
2152 stdin_channel = NULL;
2154 g_io_channel_unref (stdout_channel);
2155 stdout_channel = NULL;
2157 if (main_loop && ptp_helper_thread) {
2158 g_main_loop_quit (main_loop);
2159 g_thread_join (ptp_helper_thread);
2161 ptp_helper_thread = NULL;
2163 g_main_loop_unref (main_loop);
2166 g_main_context_unref (main_context);
2167 main_context = NULL;
2170 g_rand_free (delay_req_rand);
2171 delay_req_rand = NULL;
2173 if (observation_system_clock)
2174 gst_object_unref (observation_system_clock);
2175 observation_system_clock = NULL;
2178 g_mutex_unlock (&ptp_lock);
2186 * Deinitialize the GStreamer PTP subsystem and stop the PTP clock. If there
2187 * are any remaining GstPtpClock instances, they won't be further synchronized
2188 * to the PTP network clock.
2193 gst_ptp_deinit (void)
2197 g_mutex_lock (&ptp_lock);
2199 if (ptp_helper_pid) {
2201 kill (ptp_helper_pid, SIGKILL);
2202 waitpid (ptp_helper_pid, NULL, 0);
2204 TerminateProcess (ptp_helper_pid, 1);
2205 WaitForSingleObject (ptp_helper_pid, INFINITE);
2207 g_spawn_close_pid (ptp_helper_pid);
2212 g_io_channel_unref (stdin_channel);
2213 stdin_channel = NULL;
2215 g_io_channel_unref (stdout_channel);
2216 stdout_channel = NULL;
2218 if (main_loop && ptp_helper_thread) {
2219 GThread *tmp = ptp_helper_thread;
2220 ptp_helper_thread = NULL;
2221 g_mutex_unlock (&ptp_lock);
2222 g_main_loop_quit (main_loop);
2223 g_thread_join (tmp);
2224 g_mutex_lock (&ptp_lock);
2227 g_main_loop_unref (main_loop);
2230 g_main_context_unref (main_context);
2231 main_context = NULL;
2234 g_rand_free (delay_req_rand);
2235 delay_req_rand = NULL;
2236 if (observation_system_clock)
2237 gst_object_unref (observation_system_clock);
2238 observation_system_clock = NULL;
2240 for (l = domain_data; l; l = l->next) {
2241 PtpDomainData *domain = l->data;
2243 for (m = domain->announce_senders; m; m = m->next) {
2244 PtpAnnounceSender *sender = m->data;
2246 g_queue_foreach (&sender->announce_messages, (GFunc) g_free, NULL);
2247 g_queue_clear (&sender->announce_messages);
2250 g_list_free (domain->announce_senders);
2252 g_queue_foreach (&domain->pending_syncs, (GFunc) ptp_pending_sync_free,
2254 g_queue_clear (&domain->pending_syncs);
2255 gst_object_unref (domain->domain_clock);
2258 g_list_free (domain_data);
2260 g_list_foreach (domain_clocks, (GFunc) g_free, NULL);
2261 g_list_free (domain_clocks);
2262 domain_clocks = NULL;
2264 ptp_clock_id.clock_identity = GST_PTP_CLOCK_ID_NONE;
2265 ptp_clock_id.port_number = 0;
2269 g_mutex_unlock (&ptp_lock);
2272 #define DEFAULT_DOMAIN 0
2278 PROP_INTERNAL_CLOCK,
2279 PROP_MASTER_CLOCK_ID,
2280 PROP_GRANDMASTER_CLOCK_ID
2283 #define GST_PTP_CLOCK_GET_PRIVATE(obj) \
2284 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_PTP_CLOCK, GstPtpClockPrivate))
2286 struct _GstPtpClockPrivate
2289 GstClock *domain_clock;
2290 gulong domain_stats_id;
2293 #define gst_ptp_clock_parent_class parent_class
2294 G_DEFINE_TYPE (GstPtpClock, gst_ptp_clock, GST_TYPE_SYSTEM_CLOCK);
2296 static void gst_ptp_clock_set_property (GObject * object, guint prop_id,
2297 const GValue * value, GParamSpec * pspec);
2298 static void gst_ptp_clock_get_property (GObject * object, guint prop_id,
2299 GValue * value, GParamSpec * pspec);
2300 static void gst_ptp_clock_finalize (GObject * object);
2302 static GstClockTime gst_ptp_clock_get_internal_time (GstClock * clock);
2305 gst_ptp_clock_class_init (GstPtpClockClass * klass)
2307 GObjectClass *gobject_class;
2308 GstClockClass *clock_class;
2310 gobject_class = G_OBJECT_CLASS (klass);
2311 clock_class = GST_CLOCK_CLASS (klass);
2313 g_type_class_add_private (klass, sizeof (GstPtpClockPrivate));
2315 gobject_class->finalize = gst_ptp_clock_finalize;
2316 gobject_class->get_property = gst_ptp_clock_get_property;
2317 gobject_class->set_property = gst_ptp_clock_set_property;
2319 g_object_class_install_property (gobject_class, PROP_DOMAIN,
2320 g_param_spec_uint ("domain", "Domain",
2321 "The PTP domain", 0, G_MAXUINT8,
2323 G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
2325 g_object_class_install_property (gobject_class, PROP_INTERNAL_CLOCK,
2326 g_param_spec_object ("internal-clock", "Internal Clock",
2327 "Internal clock", GST_TYPE_CLOCK,
2328 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
2330 g_object_class_install_property (gobject_class, PROP_MASTER_CLOCK_ID,
2331 g_param_spec_uint64 ("master-clock-id", "Master Clock ID",
2332 "Master Clock ID", 0, G_MAXUINT64, 0,
2333 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
2335 g_object_class_install_property (gobject_class, PROP_GRANDMASTER_CLOCK_ID,
2336 g_param_spec_uint64 ("grandmaster-clock-id", "Grand Master Clock ID",
2337 "Grand Master Clock ID", 0, G_MAXUINT64, 0,
2338 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
2340 clock_class->get_internal_time = gst_ptp_clock_get_internal_time;
2344 gst_ptp_clock_init (GstPtpClock * self)
2346 GstPtpClockPrivate *priv;
2348 self->priv = priv = GST_PTP_CLOCK_GET_PRIVATE (self);
2350 GST_OBJECT_FLAG_SET (self, GST_CLOCK_FLAG_CAN_SET_MASTER);
2351 GST_OBJECT_FLAG_SET (self, GST_CLOCK_FLAG_NEEDS_STARTUP_SYNC);
2353 priv->domain = DEFAULT_DOMAIN;
2357 gst_ptp_clock_ensure_domain_clock (GstPtpClock * self)
2359 gboolean got_clock = TRUE;
2361 if (G_UNLIKELY (!self->priv->domain_clock)) {
2362 g_mutex_lock (&domain_clocks_lock);
2363 if (!self->priv->domain_clock) {
2368 for (l = domain_clocks; l; l = l->next) {
2369 PtpDomainData *clock_data = l->data;
2371 if (clock_data->domain == self->priv->domain
2372 && clock_data->last_ptp_time != 0) {
2373 self->priv->domain_clock = clock_data->domain_clock;
2379 g_mutex_unlock (&domain_clocks_lock);
2381 g_object_notify (G_OBJECT (self), "internal-clock");
2382 gst_clock_set_synced (GST_CLOCK (self), TRUE);
2390 gst_ptp_clock_stats_callback (guint8 domain, const GstStructure * stats,
2393 GstPtpClock *self = user_data;
2395 if (domain != self->priv->domain
2396 || !gst_structure_has_name (stats, GST_PTP_STATISTICS_TIME_UPDATED))
2399 /* Let's set our internal clock */
2400 if (!gst_ptp_clock_ensure_domain_clock (self))
2403 self->priv->domain_stats_id = 0;
2409 gst_ptp_clock_set_property (GObject * object, guint prop_id,
2410 const GValue * value, GParamSpec * pspec)
2412 GstPtpClock *self = GST_PTP_CLOCK (object);
2416 self->priv->domain = g_value_get_uint (value);
2417 gst_ptp_clock_ensure_domain_clock (self);
2418 if (!self->priv->domain_clock)
2419 self->priv->domain_stats_id =
2420 gst_ptp_statistics_callback_add (gst_ptp_clock_stats_callback, self,
2424 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
2430 gst_ptp_clock_get_property (GObject * object, guint prop_id,
2431 GValue * value, GParamSpec * pspec)
2433 GstPtpClock *self = GST_PTP_CLOCK (object);
2437 g_value_set_uint (value, self->priv->domain);
2439 case PROP_INTERNAL_CLOCK:
2440 gst_ptp_clock_ensure_domain_clock (self);
2441 g_value_set_object (value, self->priv->domain_clock);
2443 case PROP_MASTER_CLOCK_ID:
2444 case PROP_GRANDMASTER_CLOCK_ID:{
2447 g_mutex_lock (&domain_clocks_lock);
2448 g_value_set_uint64 (value, 0);
2450 for (l = domain_clocks; l; l = l->next) {
2451 PtpDomainData *clock_data = l->data;
2453 if (clock_data->domain == self->priv->domain) {
2454 if (prop_id == PROP_MASTER_CLOCK_ID)
2455 g_value_set_uint64 (value,
2456 clock_data->master_clock_identity.clock_identity);
2458 g_value_set_uint64 (value, clock_data->grandmaster_identity);
2462 g_mutex_unlock (&domain_clocks_lock);
2466 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
2472 gst_ptp_clock_finalize (GObject * object)
2474 GstPtpClock *self = GST_PTP_CLOCK (object);
2476 if (self->priv->domain_stats_id)
2477 gst_ptp_statistics_callback_remove (self->priv->domain_stats_id);
2479 G_OBJECT_CLASS (gst_ptp_clock_parent_class)->finalize (object);
2483 gst_ptp_clock_get_internal_time (GstClock * clock)
2485 GstPtpClock *self = GST_PTP_CLOCK (clock);
2487 gst_ptp_clock_ensure_domain_clock (self);
2489 if (!self->priv->domain_clock) {
2490 GST_ERROR_OBJECT (self, "Domain %u has no clock yet and is not synced",
2491 self->priv->domain);
2492 return GST_CLOCK_TIME_NONE;
2495 return gst_clock_get_time (self->priv->domain_clock);
2499 * gst_ptp_clock_new:
2500 * @name: Name of the clock
2501 * @domain: PTP domain
2503 * Creates a new PTP clock instance that exports the PTP time of the master
2504 * clock in @domain. This clock can be slaved to other clocks as needed.
2506 * If gst_ptp_init() was not called before, this will call gst_ptp_init() with
2507 * default parameters.
2509 * This clock only returns valid timestamps after it received the first
2510 * times from the PTP master clock on the network. Once this happens the
2511 * GstPtpClock::internal-clock property will become non-NULL. You can
2512 * check this with gst_clock_wait_for_sync(), the GstClock::synced signal and
2513 * gst_clock_is_synced().
2518 gst_ptp_clock_new (const gchar * name, guint domain)
2520 g_return_val_if_fail (name != NULL, NULL);
2521 g_return_val_if_fail (domain <= G_MAXUINT8, NULL);
2523 if (!initted && !gst_ptp_init (GST_PTP_CLOCK_ID_NONE, NULL)) {
2524 GST_ERROR ("Failed to initialize PTP");
2528 return g_object_new (GST_TYPE_PTP_CLOCK, "name", name, "domain", domain,
2535 const GstStructure *stats;
2536 } DomainStatsMarshalData;
2539 domain_stats_marshaller (GHook * hook, DomainStatsMarshalData * data)
2541 GstPtpStatisticsCallback callback = (GstPtpStatisticsCallback) hook->func;
2543 if (!callback (data->domain, data->stats, hook->data))
2544 g_hook_destroy (&domain_stats_hooks, hook->hook_id);
2548 emit_ptp_statistics (guint8 domain, const GstStructure * stats)
2550 DomainStatsMarshalData data = { domain, stats };
2552 g_mutex_lock (&ptp_lock);
2553 g_hook_list_marshal (&domain_stats_hooks, TRUE,
2554 (GHookMarshaller) domain_stats_marshaller, &data);
2555 g_mutex_unlock (&ptp_lock);
2559 * gst_ptp_statistics_callback_add:
2560 * @callback: GstPtpStatisticsCallback to call
2561 * @user_data: Data to pass to the callback
2562 * @destroy_data: GDestroyNotify to destroy the data
2564 * Installs a new statistics callback for gathering PTP statistics. See
2565 * GstPtpStatisticsCallback for a list of statistics that are provided.
2567 * Returns: Id for the callback that can be passed to
2568 * gst_ptp_statistics_callback_remove()
2573 gst_ptp_statistics_callback_add (GstPtpStatisticsCallback callback,
2574 gpointer user_data, GDestroyNotify destroy_data)
2578 g_mutex_lock (&ptp_lock);
2580 if (!domain_stats_hooks_initted) {
2581 g_hook_list_init (&domain_stats_hooks, sizeof (GHook));
2582 domain_stats_hooks_initted = TRUE;
2585 hook = g_hook_alloc (&domain_stats_hooks);
2586 hook->func = callback;
2587 hook->data = user_data;
2588 hook->destroy = destroy_data;
2589 g_hook_prepend (&domain_stats_hooks, hook);
2590 g_atomic_int_add (&domain_stats_n_hooks, 1);
2592 g_mutex_unlock (&ptp_lock);
2594 return hook->hook_id;
2598 * gst_ptp_statistics_callback_remove:
2599 * @id: Callback id to remove
2601 * Removes a PTP statistics callback that was previously added with
2602 * gst_ptp_statistics_callback_add().
2607 gst_ptp_statistics_callback_remove (gulong id)
2609 g_mutex_lock (&ptp_lock);
2610 if (g_hook_destroy (&domain_stats_hooks, id))
2611 g_atomic_int_add (&domain_stats_n_hooks, -1);
2612 g_mutex_unlock (&ptp_lock);