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.
22 * @short_description: Special clock that synchronizes to a remote time
23 * provider via PTP (IEEE1588:2008).
24 * @see_also: #GstClock, #GstNetClientClock, #GstPipeline
26 * GstPtpClock implements a PTP (IEEE1588:2008) ordinary clock in slave-only
27 * mode, that allows a GStreamer pipeline to synchronize to a PTP network
28 * clock in some specific domain.
30 * The PTP subsystem can be initialized with gst_ptp_init(), which then starts
31 * a helper process to do the actual communication via the PTP ports. This is
32 * required as PTP listens on ports < 1024 and thus requires special
33 * privileges. Once this helper process is started, the main process will
34 * synchronize to all PTP domains that are detected on the selected
37 * gst_ptp_clock_new() then allows to create a GstClock that provides the PTP
38 * time from a master clock inside a specific PTP domain. This clock will only
39 * return valid timestamps once the timestamps in the PTP domain are known. To
40 * check this, you can use gst_clock_wait_for_sync(), the GstClock::synced
41 * 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);
308 GstClockTime last_ptp_time;
309 GstClockTime last_local_time;
310 gint skipped_updates;
312 /* Used for selecting the master/grandmaster */
313 GList *announce_senders;
315 /* Last selected master clock */
316 gboolean have_master_clock;
317 PtpClockIdentity master_clock_identity;
318 guint64 grandmaster_identity;
320 /* Last SYNC or FOLLOW_UP timestamp we received */
321 GstClockTime last_ptp_sync_time;
322 GstClockTime sync_interval;
324 GstClockTime mean_path_delay;
325 GstClockTime last_delay_req, min_delay_req_interval;
326 guint16 last_delay_req_seqnum;
328 GstClockTime last_path_delays[MEDIAN_PRE_FILTERING_WINDOW];
329 gint last_path_delays_missing;
331 GQueue pending_syncs;
333 GstClock *domain_clock;
336 static GList *domain_data;
337 static GMutex domain_clocks_lock;
338 static GList *domain_clocks;
340 /* Protected by PTP lock */
341 static void emit_ptp_statistics (guint8 domain, const GstStructure * stats);
342 static GHookList domain_stats_hooks;
343 static gint domain_stats_n_hooks;
344 static gboolean domain_stats_hooks_initted = FALSE;
346 /* Converts log2 seconds to GstClockTime */
348 log2_to_clock_time (gint l)
351 return GST_SECOND >> (-l);
353 return GST_SECOND << l;
357 dump_ptp_message (PtpMessage * msg)
359 GST_TRACE ("PTP message:");
360 GST_TRACE ("\ttransport_specific: %u", msg->transport_specific);
361 GST_TRACE ("\tmessage_type: 0x%01x", msg->message_type);
362 GST_TRACE ("\tversion_ptp: %u", msg->version_ptp);
363 GST_TRACE ("\tmessage_length: %u", msg->message_length);
364 GST_TRACE ("\tdomain_number: %u", msg->domain_number);
365 GST_TRACE ("\tflag_field: 0x%04x", msg->flag_field);
366 GST_TRACE ("\tcorrection_field: %" G_GINT64_FORMAT ".%03u",
367 (msg->correction_field / 65536),
368 (guint) ((msg->correction_field & 0xffff) * 1000) / 65536);
369 GST_TRACE ("\tsource_port_identity: 0x%016" G_GINT64_MODIFIER "x %u",
370 msg->source_port_identity.clock_identity,
371 msg->source_port_identity.port_number);
372 GST_TRACE ("\tsequence_id: %u", msg->sequence_id);
373 GST_TRACE ("\tcontrol_field: 0x%02x", msg->control_field);
374 GST_TRACE ("\tmessage_interval: %" GST_TIME_FORMAT,
375 GST_TIME_ARGS (log2_to_clock_time (msg->log_message_interval)));
377 switch (msg->message_type) {
378 case PTP_MESSAGE_TYPE_ANNOUNCE:
379 GST_TRACE ("\tANNOUNCE:");
380 GST_TRACE ("\t\torigin_timestamp: %" G_GUINT64_FORMAT ".%09u",
381 msg->message_specific.announce.origin_timestamp.seconds_field,
382 msg->message_specific.announce.origin_timestamp.nanoseconds_field);
383 GST_TRACE ("\t\tcurrent_utc_offset: %d",
384 msg->message_specific.announce.current_utc_offset);
385 GST_TRACE ("\t\tgrandmaster_priority_1: %u",
386 msg->message_specific.announce.grandmaster_priority_1);
387 GST_TRACE ("\t\tgrandmaster_clock_quality: 0x%02x 0x%02x %u",
388 msg->message_specific.announce.grandmaster_clock_quality.clock_class,
389 msg->message_specific.announce.
390 grandmaster_clock_quality.clock_accuracy,
391 msg->message_specific.announce.
392 grandmaster_clock_quality.offset_scaled_log_variance);
393 GST_TRACE ("\t\tgrandmaster_priority_2: %u",
394 msg->message_specific.announce.grandmaster_priority_2);
395 GST_TRACE ("\t\tgrandmaster_identity: 0x%016" G_GINT64_MODIFIER "x",
396 msg->message_specific.announce.grandmaster_identity);
397 GST_TRACE ("\t\tsteps_removed: %u",
398 msg->message_specific.announce.steps_removed);
399 GST_TRACE ("\t\ttime_source: 0x%02x",
400 msg->message_specific.announce.time_source);
402 case PTP_MESSAGE_TYPE_SYNC:
403 GST_TRACE ("\tSYNC:");
404 GST_TRACE ("\t\torigin_timestamp: %" G_GUINT64_FORMAT ".%09u",
405 msg->message_specific.sync.origin_timestamp.seconds_field,
406 msg->message_specific.sync.origin_timestamp.nanoseconds_field);
408 case PTP_MESSAGE_TYPE_FOLLOW_UP:
409 GST_TRACE ("\tFOLLOW_UP:");
410 GST_TRACE ("\t\tprecise_origin_timestamp: %" G_GUINT64_FORMAT ".%09u",
411 msg->message_specific.follow_up.
412 precise_origin_timestamp.seconds_field,
413 msg->message_specific.follow_up.
414 precise_origin_timestamp.nanoseconds_field);
416 case PTP_MESSAGE_TYPE_DELAY_REQ:
417 GST_TRACE ("\tDELAY_REQ:");
418 GST_TRACE ("\t\torigin_timestamp: %" G_GUINT64_FORMAT ".%09u",
419 msg->message_specific.delay_req.origin_timestamp.seconds_field,
420 msg->message_specific.delay_req.origin_timestamp.nanoseconds_field);
422 case PTP_MESSAGE_TYPE_DELAY_RESP:
423 GST_TRACE ("\tDELAY_RESP:");
424 GST_TRACE ("\t\treceive_timestamp: %" G_GUINT64_FORMAT ".%09u",
425 msg->message_specific.delay_resp.receive_timestamp.seconds_field,
426 msg->message_specific.delay_resp.receive_timestamp.nanoseconds_field);
427 GST_TRACE ("\t\trequesting_port_identity: 0x%016" G_GINT64_MODIFIER
429 msg->message_specific.delay_resp.
430 requesting_port_identity.clock_identity,
431 msg->message_specific.delay_resp.
432 requesting_port_identity.port_number);
440 /* IEEE 1588-2008 5.3.3 */
442 parse_ptp_timestamp (PtpTimestamp * timestamp, GstByteReader * reader)
444 g_return_val_if_fail (gst_byte_reader_get_remaining (reader) >= 10, FALSE);
446 timestamp->seconds_field =
447 (((guint64) gst_byte_reader_get_uint32_be_unchecked (reader)) << 16) |
448 gst_byte_reader_get_uint16_be_unchecked (reader);
449 timestamp->nanoseconds_field =
450 gst_byte_reader_get_uint32_be_unchecked (reader);
452 if (timestamp->nanoseconds_field >= 1000000000)
458 /* IEEE 1588-2008 13.3 */
460 parse_ptp_message_header (PtpMessage * msg, GstByteReader * reader)
464 g_return_val_if_fail (gst_byte_reader_get_remaining (reader) >= 34, FALSE);
466 b = gst_byte_reader_get_uint8_unchecked (reader);
467 msg->transport_specific = b >> 4;
468 msg->message_type = b & 0x0f;
470 b = gst_byte_reader_get_uint8_unchecked (reader);
471 msg->version_ptp = b & 0x0f;
472 if (msg->version_ptp != 2) {
473 GST_WARNING ("Unsupported PTP message version (%u != 2)", msg->version_ptp);
477 msg->message_length = gst_byte_reader_get_uint16_be_unchecked (reader);
478 if (gst_byte_reader_get_remaining (reader) + 4 < msg->message_length) {
479 GST_WARNING ("Not enough data (%u < %u)",
480 gst_byte_reader_get_remaining (reader) + 4, msg->message_length);
484 msg->domain_number = gst_byte_reader_get_uint8_unchecked (reader);
485 gst_byte_reader_skip_unchecked (reader, 1);
487 msg->flag_field = gst_byte_reader_get_uint16_be_unchecked (reader);
488 msg->correction_field = gst_byte_reader_get_uint64_be_unchecked (reader);
489 gst_byte_reader_skip_unchecked (reader, 4);
491 msg->source_port_identity.clock_identity =
492 gst_byte_reader_get_uint64_be_unchecked (reader);
493 msg->source_port_identity.port_number =
494 gst_byte_reader_get_uint16_be_unchecked (reader);
496 msg->sequence_id = gst_byte_reader_get_uint16_be_unchecked (reader);
497 msg->control_field = gst_byte_reader_get_uint8_unchecked (reader);
498 msg->log_message_interval = gst_byte_reader_get_uint8_unchecked (reader);
503 /* IEEE 1588-2008 13.5 */
505 parse_ptp_message_announce (PtpMessage * msg, GstByteReader * reader)
507 g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_ANNOUNCE, FALSE);
509 if (gst_byte_reader_get_remaining (reader) < 20)
512 if (!parse_ptp_timestamp (&msg->message_specific.announce.origin_timestamp,
516 msg->message_specific.announce.current_utc_offset =
517 gst_byte_reader_get_uint16_be_unchecked (reader);
518 gst_byte_reader_skip_unchecked (reader, 1);
520 msg->message_specific.announce.grandmaster_priority_1 =
521 gst_byte_reader_get_uint8_unchecked (reader);
522 msg->message_specific.announce.grandmaster_clock_quality.clock_class =
523 gst_byte_reader_get_uint8_unchecked (reader);
524 msg->message_specific.announce.grandmaster_clock_quality.clock_accuracy =
525 gst_byte_reader_get_uint8_unchecked (reader);
526 msg->message_specific.announce.
527 grandmaster_clock_quality.offset_scaled_log_variance =
528 gst_byte_reader_get_uint16_be_unchecked (reader);
529 msg->message_specific.announce.grandmaster_priority_2 =
530 gst_byte_reader_get_uint8_unchecked (reader);
531 msg->message_specific.announce.grandmaster_identity =
532 gst_byte_reader_get_uint64_be_unchecked (reader);
533 msg->message_specific.announce.steps_removed =
534 gst_byte_reader_get_uint16_be_unchecked (reader);
535 msg->message_specific.announce.time_source =
536 gst_byte_reader_get_uint8_unchecked (reader);
541 /* IEEE 1588-2008 13.6 */
543 parse_ptp_message_sync (PtpMessage * msg, GstByteReader * reader)
545 g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_SYNC, FALSE);
547 if (gst_byte_reader_get_remaining (reader) < 10)
550 if (!parse_ptp_timestamp (&msg->message_specific.sync.origin_timestamp,
557 /* IEEE 1588-2008 13.6 */
559 parse_ptp_message_delay_req (PtpMessage * msg, GstByteReader * reader)
561 g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_DELAY_REQ, FALSE);
563 if (gst_byte_reader_get_remaining (reader) < 10)
566 if (!parse_ptp_timestamp (&msg->message_specific.delay_req.origin_timestamp,
573 /* IEEE 1588-2008 13.7 */
575 parse_ptp_message_follow_up (PtpMessage * msg, GstByteReader * reader)
577 g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_FOLLOW_UP, FALSE);
579 if (gst_byte_reader_get_remaining (reader) < 10)
582 if (!parse_ptp_timestamp (&msg->message_specific.
583 follow_up.precise_origin_timestamp, reader))
589 /* IEEE 1588-2008 13.8 */
591 parse_ptp_message_delay_resp (PtpMessage * msg, GstByteReader * reader)
593 g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_DELAY_RESP,
596 if (gst_byte_reader_get_remaining (reader) < 20)
599 if (!parse_ptp_timestamp (&msg->message_specific.delay_resp.receive_timestamp,
603 msg->message_specific.delay_resp.requesting_port_identity.clock_identity =
604 gst_byte_reader_get_uint64_be_unchecked (reader);
605 msg->message_specific.delay_resp.requesting_port_identity.port_number =
606 gst_byte_reader_get_uint16_be_unchecked (reader);
612 parse_ptp_message (PtpMessage * msg, const guint8 * data, gsize size)
614 GstByteReader reader;
615 gboolean ret = FALSE;
617 gst_byte_reader_init (&reader, data, size);
619 if (!parse_ptp_message_header (msg, &reader)) {
620 GST_WARNING ("Failed to parse PTP message header");
624 switch (msg->message_type) {
625 case PTP_MESSAGE_TYPE_SYNC:
626 ret = parse_ptp_message_sync (msg, &reader);
628 case PTP_MESSAGE_TYPE_FOLLOW_UP:
629 ret = parse_ptp_message_follow_up (msg, &reader);
631 case PTP_MESSAGE_TYPE_DELAY_REQ:
632 ret = parse_ptp_message_delay_req (msg, &reader);
634 case PTP_MESSAGE_TYPE_DELAY_RESP:
635 ret = parse_ptp_message_delay_resp (msg, &reader);
637 case PTP_MESSAGE_TYPE_ANNOUNCE:
638 ret = parse_ptp_message_announce (msg, &reader);
649 compare_announce_message (const PtpAnnounceMessage * a,
650 const PtpAnnounceMessage * b)
652 /* IEEE 1588 Figure 27 */
653 if (a->grandmaster_identity == b->grandmaster_identity) {
654 if (a->steps_removed + 1 < b->steps_removed)
656 else if (a->steps_removed > b->steps_removed + 1)
659 /* Error cases are filtered out earlier */
660 if (a->steps_removed < b->steps_removed)
662 else if (a->steps_removed > b->steps_removed)
665 /* Error cases are filtered out earlier */
666 if (a->master_clock_identity.clock_identity <
667 b->master_clock_identity.clock_identity)
669 else if (a->master_clock_identity.clock_identity >
670 b->master_clock_identity.clock_identity)
673 /* Error cases are filtered out earlier */
674 if (a->master_clock_identity.port_number <
675 b->master_clock_identity.port_number)
677 else if (a->master_clock_identity.port_number >
678 b->master_clock_identity.port_number)
681 g_assert_not_reached ();
686 if (a->grandmaster_priority_1 < b->grandmaster_priority_1)
688 else if (a->grandmaster_priority_1 > b->grandmaster_priority_1)
691 if (a->grandmaster_clock_quality.clock_class <
692 b->grandmaster_clock_quality.clock_class)
694 else if (a->grandmaster_clock_quality.clock_class >
695 b->grandmaster_clock_quality.clock_class)
698 if (a->grandmaster_clock_quality.clock_accuracy <
699 b->grandmaster_clock_quality.clock_accuracy)
701 else if (a->grandmaster_clock_quality.clock_accuracy >
702 b->grandmaster_clock_quality.clock_accuracy)
705 if (a->grandmaster_clock_quality.offset_scaled_log_variance <
706 b->grandmaster_clock_quality.offset_scaled_log_variance)
708 else if (a->grandmaster_clock_quality.offset_scaled_log_variance >
709 b->grandmaster_clock_quality.offset_scaled_log_variance)
712 if (a->grandmaster_priority_2 < b->grandmaster_priority_2)
714 else if (a->grandmaster_priority_2 > b->grandmaster_priority_2)
717 if (a->grandmaster_identity < b->grandmaster_identity)
719 else if (a->grandmaster_identity > b->grandmaster_identity)
722 g_assert_not_reached ();
728 select_best_master_clock (PtpDomainData * domain, GstClockTime now)
730 GList *qualified_messages = NULL;
732 PtpAnnounceMessage *best = NULL;
734 /* IEEE 1588 9.3.2.5 */
735 for (l = domain->announce_senders; l; l = l->next) {
736 PtpAnnounceSender *sender = l->data;
737 GstClockTime window = 4 * sender->announce_interval;
740 for (m = sender->announce_messages.head; m; m = m->next) {
741 PtpAnnounceMessage *msg = m->data;
743 if (now - msg->receive_time <= window)
747 /* Only include the newest message of announce senders that had at least 2
748 * announce messages in the last 4 announce intervals. Which also means
749 * that we wait at least 4 announce intervals before we select a master
750 * clock. Until then we just report based on the newest SYNC we received
754 g_list_prepend (qualified_messages,
755 g_queue_peek_tail (&sender->announce_messages));
759 if (!qualified_messages) {
761 ("No qualified announce messages for domain %u, can't select a master clock",
763 domain->have_master_clock = FALSE;
767 for (l = qualified_messages; l; l = l->next) {
768 PtpAnnounceMessage *msg = l->data;
770 if (!best || compare_announce_message (msg, best) < 0)
774 if (domain->have_master_clock
775 && compare_clock_identity (&domain->master_clock_identity,
776 &best->master_clock_identity) == 0) {
777 GST_DEBUG ("Master clock in domain %u did not change", domain->domain);
779 GST_DEBUG ("Selected master clock for domain %u: 0x%016" G_GINT64_MODIFIER
780 "x %u with grandmaster clock 0x%016" G_GINT64_MODIFIER "x",
781 domain->domain, best->master_clock_identity.clock_identity,
782 best->master_clock_identity.port_number, best->grandmaster_identity);
784 domain->have_master_clock = TRUE;
785 domain->grandmaster_identity = best->grandmaster_identity;
787 /* Opportunistic master clock selection likely gave us the same master
788 * clock before, no need to reset all statistics */
789 if (compare_clock_identity (&domain->master_clock_identity,
790 &best->master_clock_identity) != 0) {
791 memcpy (&domain->master_clock_identity, &best->master_clock_identity,
792 sizeof (PtpClockIdentity));
793 domain->mean_path_delay = 0;
794 domain->last_delay_req = 0;
795 domain->last_path_delays_missing = 9;
796 domain->min_delay_req_interval = 0;
797 domain->sync_interval = 0;
798 domain->last_ptp_sync_time = 0;
799 domain->skipped_updates = 0;
800 g_queue_foreach (&domain->pending_syncs, (GFunc) ptp_pending_sync_free,
802 g_queue_clear (&domain->pending_syncs);
805 if (g_atomic_int_get (&domain_stats_n_hooks)) {
806 GstStructure *stats =
807 gst_structure_new (GST_PTP_STATISTICS_BEST_MASTER_CLOCK_SELECTED,
808 "domain", G_TYPE_UINT, domain->domain,
809 "master-clock-id", G_TYPE_UINT64,
810 domain->master_clock_identity.clock_identity,
811 "master-clock-port", G_TYPE_UINT,
812 domain->master_clock_identity.port_number,
813 "grandmaster-clock-id", G_TYPE_UINT64, domain->grandmaster_identity,
815 emit_ptp_statistics (domain->domain, stats);
816 gst_structure_free (stats);
822 handle_announce_message (PtpMessage * msg, GstClockTime receive_time)
825 PtpDomainData *domain = NULL;
826 PtpAnnounceSender *sender = NULL;
827 PtpAnnounceMessage *announce;
829 /* IEEE1588 9.3.2.2 e)
830 * Don't consider messages with the alternate master flag set
832 if ((msg->flag_field & 0x0100))
835 /* IEEE 1588 9.3.2.5 d)
836 * Don't consider announce messages with steps_removed>=255
838 if (msg->message_specific.announce.steps_removed >= 255)
841 for (l = domain_data; l; l = l->next) {
842 PtpDomainData *tmp = l->data;
844 if (tmp->domain == msg->domain_number) {
853 domain = g_new0 (PtpDomainData, 1);
854 domain->domain = msg->domain_number;
855 clock_name = g_strdup_printf ("ptp-clock-%u", domain->domain);
856 domain->domain_clock =
857 g_object_new (GST_TYPE_SYSTEM_CLOCK, "name", clock_name, NULL);
859 g_queue_init (&domain->pending_syncs);
860 domain->last_path_delays_missing = 9;
861 domain_data = g_list_prepend (domain_data, domain);
863 g_mutex_lock (&domain_clocks_lock);
864 domain_clocks = g_list_prepend (domain_clocks, domain);
865 g_mutex_unlock (&domain_clocks_lock);
867 if (g_atomic_int_get (&domain_stats_n_hooks)) {
868 GstStructure *stats =
869 gst_structure_new (GST_PTP_STATISTICS_NEW_DOMAIN_FOUND, "domain",
870 G_TYPE_UINT, domain->domain, "clock", GST_TYPE_CLOCK,
871 domain->domain_clock, NULL);
872 emit_ptp_statistics (domain->domain, stats);
873 gst_structure_free (stats);
877 for (l = domain->announce_senders; l; l = l->next) {
878 PtpAnnounceSender *tmp = l->data;
880 if (compare_clock_identity (&tmp->master_clock_identity,
881 &msg->source_port_identity) == 0) {
888 sender = g_new0 (PtpAnnounceSender, 1);
890 memcpy (&sender->master_clock_identity, &msg->source_port_identity,
891 sizeof (PtpClockIdentity));
892 g_queue_init (&sender->announce_messages);
893 domain->announce_senders =
894 g_list_prepend (domain->announce_senders, sender);
897 for (l = sender->announce_messages.head; l; l = l->next) {
898 PtpAnnounceMessage *tmp = l->data;
900 /* IEEE 1588 9.3.2.5 c)
901 * Don't consider identical messages, i.e. duplicates
903 if (tmp->sequence_id == msg->sequence_id)
907 sender->announce_interval = log2_to_clock_time (msg->log_message_interval);
909 announce = g_new0 (PtpAnnounceMessage, 1);
910 announce->receive_time = receive_time;
911 announce->sequence_id = msg->sequence_id;
912 memcpy (&announce->master_clock_identity, &msg->source_port_identity,
913 sizeof (PtpClockIdentity));
914 announce->grandmaster_identity =
915 msg->message_specific.announce.grandmaster_identity;
916 announce->grandmaster_priority_1 =
917 msg->message_specific.announce.grandmaster_priority_1;
918 announce->grandmaster_clock_quality.clock_class =
919 msg->message_specific.announce.grandmaster_clock_quality.clock_class;
920 announce->grandmaster_clock_quality.clock_accuracy =
921 msg->message_specific.announce.grandmaster_clock_quality.clock_accuracy;
922 announce->grandmaster_clock_quality.offset_scaled_log_variance =
923 msg->message_specific.announce.
924 grandmaster_clock_quality.offset_scaled_log_variance;
925 announce->grandmaster_priority_2 =
926 msg->message_specific.announce.grandmaster_priority_2;
927 announce->steps_removed = msg->message_specific.announce.steps_removed;
928 announce->time_source = msg->message_specific.announce.time_source;
929 g_queue_push_tail (&sender->announce_messages, announce);
931 select_best_master_clock (domain, receive_time);
935 send_delay_req_timeout (PtpPendingSync * sync)
937 StdIOHeader header = { 0, };
938 guint8 delay_req[44];
939 GstByteWriter writer;
944 header.type = TYPE_EVENT;
947 gst_byte_writer_init_with_data (&writer, delay_req, 44, FALSE);
948 gst_byte_writer_put_uint8_unchecked (&writer, PTP_MESSAGE_TYPE_DELAY_REQ);
949 gst_byte_writer_put_uint8_unchecked (&writer, 2);
950 gst_byte_writer_put_uint16_be_unchecked (&writer, 44);
951 gst_byte_writer_put_uint8_unchecked (&writer, sync->domain);
952 gst_byte_writer_put_uint8_unchecked (&writer, 0);
953 gst_byte_writer_put_uint16_be_unchecked (&writer, 0);
954 gst_byte_writer_put_uint64_be_unchecked (&writer, 0);
955 gst_byte_writer_put_uint32_be_unchecked (&writer, 0);
956 gst_byte_writer_put_uint64_be_unchecked (&writer,
957 ptp_clock_id.clock_identity);
958 gst_byte_writer_put_uint16_be_unchecked (&writer, ptp_clock_id.port_number);
959 gst_byte_writer_put_uint16_be_unchecked (&writer, sync->delay_req_seqnum);
960 gst_byte_writer_put_uint8_unchecked (&writer, 0x01);
961 gst_byte_writer_put_uint8_unchecked (&writer, 0x7f);
962 gst_byte_writer_put_uint64_be_unchecked (&writer, 0);
963 gst_byte_writer_put_uint16_be_unchecked (&writer, 0);
966 g_io_channel_write_chars (stdout_channel, (gchar *) & header,
967 sizeof (header), &written, &err);
968 if (status == G_IO_STATUS_ERROR) {
969 g_warning ("Failed to write to stdout: %s", err->message);
970 g_clear_error (&err);
971 return G_SOURCE_REMOVE;
972 } else if (status == G_IO_STATUS_EOF) {
973 g_message ("EOF on stdout");
974 g_main_loop_quit (main_loop);
975 return G_SOURCE_REMOVE;
976 } else if (status != G_IO_STATUS_NORMAL) {
977 g_warning ("Unexpected stdout write status: %d", status);
978 g_main_loop_quit (main_loop);
979 return G_SOURCE_REMOVE;
980 } else if (written != sizeof (header)) {
981 g_warning ("Unexpected write size: %" G_GSIZE_FORMAT, written);
982 g_main_loop_quit (main_loop);
983 return G_SOURCE_REMOVE;
986 sync->delay_req_send_time_local =
987 gst_clock_get_time (observation_system_clock);
990 g_io_channel_write_chars (stdout_channel,
991 (const gchar *) delay_req, 44, &written, &err);
992 if (status == G_IO_STATUS_ERROR) {
993 g_warning ("Failed to write to stdout: %s", err->message);
994 g_clear_error (&err);
995 g_main_loop_quit (main_loop);
996 return G_SOURCE_REMOVE;
997 } else if (status == G_IO_STATUS_EOF) {
998 g_message ("EOF on stdout");
999 g_main_loop_quit (main_loop);
1000 return G_SOURCE_REMOVE;
1001 } else if (status != G_IO_STATUS_NORMAL) {
1002 g_warning ("Unexpected stdout write status: %d", status);
1003 g_main_loop_quit (main_loop);
1004 return G_SOURCE_REMOVE;
1005 } else if (written != 44) {
1006 g_warning ("Unexpected write size: %" G_GSIZE_FORMAT, written);
1007 g_main_loop_quit (main_loop);
1008 return G_SOURCE_REMOVE;
1011 return G_SOURCE_REMOVE;
1015 send_delay_req (PtpDomainData * domain, PtpPendingSync * sync)
1017 GstClockTime now = gst_clock_get_time (observation_system_clock);
1019 GSource *timeout_source;
1021 if (domain->last_delay_req != 0
1022 && domain->last_delay_req + domain->min_delay_req_interval > now)
1025 domain->last_delay_req = now;
1026 sync->delay_req_seqnum = domain->last_delay_req_seqnum++;
1028 /* IEEE 1588 9.5.11.2 */
1029 if (domain->last_delay_req == 0 || domain->min_delay_req_interval == 0)
1033 g_rand_int_range (delay_req_rand, 0,
1034 (domain->min_delay_req_interval * 2) / GST_MSECOND);
1036 sync->timeout_source = timeout_source = g_timeout_source_new (timeout);
1037 g_source_set_priority (timeout_source, G_PRIORITY_DEFAULT);
1038 g_source_set_callback (timeout_source, (GSourceFunc) send_delay_req_timeout,
1040 g_source_attach (timeout_source, main_context);
1045 /* Filtering of outliers for RTT and time calculations inspired
1046 * by the code from gstnetclientclock.c
1049 update_ptp_time (PtpDomainData * domain, PtpPendingSync * sync)
1051 GstClockTime internal_time, external_time, rate_num, rate_den;
1052 GstClockTime corrected_ptp_time, corrected_local_time;
1053 gdouble r_squared = 0.0;
1055 GstClockTimeDiff discont = 0;
1056 GstClockTime estimated_ptp_time = GST_CLOCK_TIME_NONE;
1057 #ifdef USE_MEASUREMENT_FILTERING
1058 GstClockTime orig_internal_time, orig_external_time, orig_rate_num,
1060 GstClockTime new_estimated_ptp_time;
1061 GstClockTime max_discont, estimated_ptp_time_min, estimated_ptp_time_max;
1062 gboolean now_synced;
1065 #ifdef USE_ONLY_SYNC_WITH_DELAY
1066 GstClockTime mean_path_delay;
1068 if (sync->delay_req_send_time_local == GST_CLOCK_TIME_NONE)
1071 /* IEEE 1588 11.3 */
1073 (sync->delay_req_recv_time_remote - sync->sync_send_time_remote +
1074 sync->sync_recv_time_local - sync->delay_req_send_time_local -
1075 (sync->correction_field_sync + sync->correction_field_delay +
1076 32768) / 65536) / 2;
1079 /* IEEE 1588 11.2 */
1080 corrected_ptp_time =
1081 sync->sync_send_time_remote +
1082 (sync->correction_field_sync + 32768) / 65536;
1084 #ifdef USE_ONLY_SYNC_WITH_DELAY
1085 corrected_local_time = sync->sync_recv_time_local - mean_path_delay;
1087 corrected_local_time = sync->sync_recv_time_local - domain->mean_path_delay;
1090 #ifdef USE_MEASUREMENT_FILTERING
1091 /* We check this here and when updating the mean path delay, because
1092 * we can get here without a delay response too */
1093 if (sync->follow_up_recv_time_local != GST_CLOCK_TIME_NONE
1094 && sync->follow_up_recv_time_local >
1095 sync->sync_recv_time_local + 2 * domain->mean_path_delay) {
1096 GST_WARNING ("Sync-follow-up delay for domain %u too big: %" GST_TIME_FORMAT
1097 " > 2 * %" GST_TIME_FORMAT, domain->domain,
1098 GST_TIME_ARGS (sync->follow_up_recv_time_local),
1099 GST_TIME_ARGS (domain->mean_path_delay));
1101 gst_clock_get_calibration (GST_CLOCK_CAST (domain->domain_clock),
1102 &internal_time, &external_time, &rate_num, &rate_den);
1107 /* Set an initial local-remote relation */
1108 if (domain->last_ptp_time == 0)
1109 gst_clock_set_calibration (domain->domain_clock, corrected_local_time,
1110 corrected_ptp_time, 1, 1);
1112 #ifdef USE_MEASUREMENT_FILTERING
1113 /* Check if the corrected PTP time is +/- 3/4 RTT around what we would
1114 * estimate with our present knowledge about the clock
1116 /* Store what the clock produced as 'now' before this update */
1117 gst_clock_get_calibration (GST_CLOCK_CAST (domain->domain_clock),
1118 &orig_internal_time, &orig_external_time, &orig_rate_num, &orig_rate_den);
1119 internal_time = orig_internal_time;
1120 external_time = orig_external_time;
1121 rate_num = orig_rate_num;
1122 rate_den = orig_rate_den;
1124 /* 3/4 RTT window around the estimation */
1125 max_discont = domain->mean_path_delay * 3 / 2;
1127 /* Check if the estimated sync time is inside our window */
1128 estimated_ptp_time_min = corrected_local_time - max_discont;
1129 estimated_ptp_time_min =
1130 gst_clock_adjust_with_calibration (GST_CLOCK_CAST (domain->domain_clock),
1131 estimated_ptp_time_min, internal_time, external_time, rate_num, rate_den);
1132 estimated_ptp_time_max = corrected_local_time + max_discont;
1133 estimated_ptp_time_max =
1134 gst_clock_adjust_with_calibration (GST_CLOCK_CAST (domain->domain_clock),
1135 estimated_ptp_time_max, internal_time, external_time, rate_num, rate_den);
1137 synced = (estimated_ptp_time_min < corrected_ptp_time
1138 && corrected_ptp_time < estimated_ptp_time_max);
1140 GST_DEBUG ("Adding observation for domain %u: %" GST_TIME_FORMAT " - %"
1141 GST_TIME_FORMAT, domain->domain,
1142 GST_TIME_ARGS (corrected_ptp_time), GST_TIME_ARGS (corrected_local_time));
1144 GST_DEBUG ("Synced %d: %" GST_TIME_FORMAT " < %" GST_TIME_FORMAT " < %"
1145 GST_TIME_FORMAT, synced, GST_TIME_ARGS (estimated_ptp_time_min),
1146 GST_TIME_ARGS (corrected_ptp_time),
1147 GST_TIME_ARGS (estimated_ptp_time_max));
1149 if (gst_clock_add_observation_unapplied (domain->domain_clock,
1150 corrected_local_time, corrected_ptp_time, &r_squared,
1151 &internal_time, &external_time, &rate_num, &rate_den)) {
1152 GST_DEBUG ("Regression gave r_squared: %f", r_squared);
1154 /* Old estimated PTP time based on receive time and path delay */
1155 estimated_ptp_time = corrected_local_time;
1156 estimated_ptp_time =
1157 gst_clock_adjust_with_calibration (GST_CLOCK_CAST
1158 (domain->domain_clock), estimated_ptp_time, orig_internal_time,
1159 orig_external_time, orig_rate_num, orig_rate_den);
1161 /* New estimated PTP time based on receive time and path delay */
1162 new_estimated_ptp_time = corrected_local_time;
1163 new_estimated_ptp_time =
1164 gst_clock_adjust_with_calibration (GST_CLOCK_CAST
1165 (domain->domain_clock), new_estimated_ptp_time, internal_time,
1166 external_time, rate_num, rate_den);
1168 discont = GST_CLOCK_DIFF (estimated_ptp_time, new_estimated_ptp_time);
1169 if (synced && ABS (discont) > max_discont) {
1170 GstClockTimeDiff offset;
1171 GST_DEBUG ("Too large a discont %s%" GST_TIME_FORMAT
1172 ", clamping to 1/4 average RTT = %" GST_TIME_FORMAT,
1173 (discont < 0 ? "-" : ""), GST_TIME_ARGS (ABS (discont)),
1174 GST_TIME_ARGS (max_discont));
1175 if (discont > 0) { /* Too large a forward step - add a -ve offset */
1176 offset = max_discont - discont;
1177 if (-offset > external_time)
1180 external_time += offset;
1181 } else { /* Too large a backward step - add a +ve offset */
1182 offset = -(max_discont + discont);
1183 external_time += offset;
1188 GST_DEBUG ("Discont %s%" GST_TIME_FORMAT " (max: %" GST_TIME_FORMAT ")",
1189 (discont < 0 ? "-" : ""), GST_TIME_ARGS (ABS (discont)),
1190 GST_TIME_ARGS (max_discont));
1193 /* Check if the estimated sync time is now (still) inside our window */
1194 estimated_ptp_time_min = corrected_local_time - max_discont;
1195 estimated_ptp_time_min =
1196 gst_clock_adjust_with_calibration (GST_CLOCK_CAST
1197 (domain->domain_clock), estimated_ptp_time_min, internal_time,
1198 external_time, rate_num, rate_den);
1199 estimated_ptp_time_max = corrected_local_time + max_discont;
1200 estimated_ptp_time_max =
1201 gst_clock_adjust_with_calibration (GST_CLOCK_CAST
1202 (domain->domain_clock), estimated_ptp_time_max, internal_time,
1203 external_time, rate_num, rate_den);
1205 now_synced = (estimated_ptp_time_min < corrected_ptp_time
1206 && corrected_ptp_time < estimated_ptp_time_max);
1208 GST_DEBUG ("Now synced %d: %" GST_TIME_FORMAT " < %" GST_TIME_FORMAT " < %"
1209 GST_TIME_FORMAT, now_synced, GST_TIME_ARGS (estimated_ptp_time_min),
1210 GST_TIME_ARGS (corrected_ptp_time),
1211 GST_TIME_ARGS (estimated_ptp_time_max));
1213 if (synced || now_synced || domain->skipped_updates > MAX_SKIPPED_UPDATES) {
1214 gst_clock_set_calibration (GST_CLOCK_CAST (domain->domain_clock),
1215 internal_time, external_time, rate_num, rate_den);
1216 domain->skipped_updates = 0;
1218 domain->last_ptp_time = corrected_ptp_time;
1219 domain->last_local_time = corrected_local_time;
1221 domain->skipped_updates++;
1224 domain->last_ptp_time = corrected_ptp_time;
1225 domain->last_local_time = corrected_local_time;
1229 GST_DEBUG ("Adding observation for domain %u: %" GST_TIME_FORMAT " - %"
1230 GST_TIME_FORMAT, domain->domain,
1231 GST_TIME_ARGS (corrected_ptp_time), GST_TIME_ARGS (corrected_local_time));
1233 gst_clock_get_calibration (GST_CLOCK_CAST (domain->domain_clock),
1234 &internal_time, &external_time, &rate_num, &rate_den);
1236 estimated_ptp_time = corrected_local_time;
1237 estimated_ptp_time =
1238 gst_clock_adjust_with_calibration (GST_CLOCK_CAST
1239 (domain->domain_clock), estimated_ptp_time, internal_time,
1240 external_time, rate_num, rate_den);
1242 gst_clock_add_observation (domain->domain_clock,
1243 corrected_local_time, corrected_ptp_time, &r_squared);
1245 gst_clock_get_calibration (GST_CLOCK_CAST (domain->domain_clock),
1246 &internal_time, &external_time, &rate_num, &rate_den);
1249 domain->last_ptp_time = corrected_ptp_time;
1250 domain->last_local_time = corrected_local_time;
1253 #ifdef USE_MEASUREMENT_FILTERING
1256 if (g_atomic_int_get (&domain_stats_n_hooks)) {
1257 GstStructure *stats = gst_structure_new (GST_PTP_STATISTICS_TIME_UPDATED,
1258 "domain", G_TYPE_UINT, domain->domain,
1259 "mean-path-delay-avg", GST_TYPE_CLOCK_TIME, domain->mean_path_delay,
1260 "local-time", GST_TYPE_CLOCK_TIME, corrected_local_time,
1261 "ptp-time", GST_TYPE_CLOCK_TIME, corrected_ptp_time,
1262 "estimated-ptp-time", GST_TYPE_CLOCK_TIME, estimated_ptp_time,
1263 "discontinuity", G_TYPE_INT64, discont,
1264 "synced", G_TYPE_BOOLEAN, synced,
1265 "r-squared", G_TYPE_DOUBLE, r_squared,
1266 "internal-time", GST_TYPE_CLOCK_TIME, internal_time,
1267 "external-time", GST_TYPE_CLOCK_TIME, external_time,
1268 "rate-num", G_TYPE_UINT64, rate_num,
1269 "rate-den", G_TYPE_UINT64, rate_den,
1270 "rate", G_TYPE_DOUBLE, (gdouble) (rate_num) / rate_den,
1272 emit_ptp_statistics (domain->domain, stats);
1273 gst_structure_free (stats);
1278 #ifdef USE_MEDIAN_PRE_FILTERING
1280 compare_clock_time (const GstClockTime * a, const GstClockTime * b)
1291 update_mean_path_delay (PtpDomainData * domain, PtpPendingSync * sync)
1293 #ifdef USE_MEDIAN_PRE_FILTERING
1294 GstClockTime last_path_delays[MEDIAN_PRE_FILTERING_WINDOW];
1295 GstClockTime median;
1299 GstClockTime mean_path_delay, delay_req_delay = 0;
1302 /* IEEE 1588 11.3 */
1304 (sync->delay_req_recv_time_remote - sync->sync_send_time_remote +
1305 sync->sync_recv_time_local - sync->delay_req_send_time_local -
1306 (sync->correction_field_sync + sync->correction_field_delay +
1307 32768) / 65536) / 2;
1309 #ifdef USE_MEDIAN_PRE_FILTERING
1310 for (i = 1; i < MEDIAN_PRE_FILTERING_WINDOW; i++)
1311 domain->last_path_delays[i - 1] = domain->last_path_delays[i];
1312 domain->last_path_delays[i - 1] = mean_path_delay;
1314 if (domain->last_path_delays_missing) {
1315 domain->last_path_delays_missing--;
1317 memcpy (&last_path_delays, &domain->last_path_delays,
1318 sizeof (last_path_delays));
1319 g_qsort_with_data (&last_path_delays,
1320 MEDIAN_PRE_FILTERING_WINDOW, sizeof (GstClockTime),
1321 (GCompareDataFunc) compare_clock_time, NULL);
1323 median = last_path_delays[MEDIAN_PRE_FILTERING_WINDOW / 2];
1325 /* FIXME: We might want to use something else here, like only allowing
1326 * things in the interquartile range, or also filtering away delays that
1327 * are too small compared to the median. This here worked well enough
1330 if (mean_path_delay > 2 * median) {
1331 GST_WARNING ("Path delay for domain %u too big compared to median: %"
1332 GST_TIME_FORMAT " > 2 * %" GST_TIME_FORMAT, domain->domain,
1333 GST_TIME_ARGS (mean_path_delay), GST_TIME_ARGS (median));
1340 #ifdef USE_RUNNING_AVERAGE_DELAY
1341 /* Track an average round trip time, for a bit of smoothing */
1342 /* Always update before discarding a sample, so genuine changes in
1343 * the network get picked up, eventually */
1344 if (domain->mean_path_delay == 0)
1345 domain->mean_path_delay = mean_path_delay;
1346 else if (mean_path_delay < domain->mean_path_delay) /* Shorter RTTs carry more weight than longer */
1347 domain->mean_path_delay =
1348 (3 * domain->mean_path_delay + mean_path_delay) / 4;
1350 domain->mean_path_delay =
1351 (15 * domain->mean_path_delay + mean_path_delay) / 16;
1353 domain->mean_path_delay = mean_path_delay;
1356 #ifdef USE_MEASUREMENT_FILTERING
1357 if (sync->follow_up_recv_time_local != GST_CLOCK_TIME_NONE &&
1358 domain->mean_path_delay != 0
1359 && sync->follow_up_recv_time_local >
1360 sync->sync_recv_time_local + 2 * domain->mean_path_delay) {
1361 GST_WARNING ("Sync-follow-up delay for domain %u too big: %" GST_TIME_FORMAT
1362 " > 2 * %" GST_TIME_FORMAT, domain->domain,
1363 GST_TIME_ARGS (sync->follow_up_recv_time_local -
1364 sync->sync_recv_time_local),
1365 GST_TIME_ARGS (domain->mean_path_delay));
1370 if (mean_path_delay > 2 * domain->mean_path_delay) {
1371 GST_WARNING ("Mean path delay for domain %u too big: %" GST_TIME_FORMAT
1372 " > 2 * %" GST_TIME_FORMAT, domain->domain,
1373 GST_TIME_ARGS (mean_path_delay),
1374 GST_TIME_ARGS (domain->mean_path_delay));
1381 sync->delay_resp_recv_time_local - sync->delay_req_send_time_local;
1383 #ifdef USE_MEASUREMENT_FILTERING
1384 /* delay_req_delay is a RTT, so 2 times the path delay */
1385 if (delay_req_delay > 4 * domain->mean_path_delay) {
1386 GST_WARNING ("Delay-request-response delay for domain %u too big: %"
1387 GST_TIME_FORMAT " > 4 * %" GST_TIME_FORMAT, domain->domain,
1388 GST_TIME_ARGS (delay_req_delay),
1389 GST_TIME_ARGS (domain->mean_path_delay));
1397 GST_DEBUG ("Got mean path delay for domain %u: %" GST_TIME_FORMAT " (new: %"
1398 GST_TIME_FORMAT ")", domain->domain,
1399 GST_TIME_ARGS (domain->mean_path_delay), GST_TIME_ARGS (mean_path_delay));
1400 GST_DEBUG ("Delay request delay for domain %u: %" GST_TIME_FORMAT,
1401 domain->domain, GST_TIME_ARGS (delay_req_delay));
1403 #ifdef USE_MEASUREMENT_FILTERING
1406 if (g_atomic_int_get (&domain_stats_n_hooks)) {
1407 GstStructure *stats =
1408 gst_structure_new (GST_PTP_STATISTICS_PATH_DELAY_MEASURED,
1409 "domain", G_TYPE_UINT, domain->domain,
1410 "mean-path-delay-avg", GST_TYPE_CLOCK_TIME, domain->mean_path_delay,
1411 "mean-path-delay", GST_TYPE_CLOCK_TIME, mean_path_delay,
1412 "delay-request-delay", GST_TYPE_CLOCK_TIME, delay_req_delay, NULL);
1413 emit_ptp_statistics (domain->domain, stats);
1414 gst_structure_free (stats);
1421 handle_sync_message (PtpMessage * msg, GstClockTime receive_time)
1424 PtpDomainData *domain = NULL;
1425 PtpPendingSync *sync = NULL;
1427 /* Don't consider messages with the alternate master flag set */
1428 if ((msg->flag_field & 0x0100))
1431 for (l = domain_data; l; l = l->next) {
1432 PtpDomainData *tmp = l->data;
1434 if (msg->domain_number == tmp->domain) {
1443 domain = g_new0 (PtpDomainData, 1);
1444 domain->domain = msg->domain_number;
1445 clock_name = g_strdup_printf ("ptp-clock-%u", domain->domain);
1446 domain->domain_clock =
1447 g_object_new (GST_TYPE_SYSTEM_CLOCK, "name", clock_name, NULL);
1448 g_free (clock_name);
1449 g_queue_init (&domain->pending_syncs);
1450 domain->last_path_delays_missing = 9;
1451 domain_data = g_list_prepend (domain_data, domain);
1453 g_mutex_lock (&domain_clocks_lock);
1454 domain_clocks = g_list_prepend (domain_clocks, domain);
1455 g_mutex_unlock (&domain_clocks_lock);
1458 /* If we have a master clock, ignore this message if it's not coming from there */
1459 if (domain->have_master_clock
1460 && compare_clock_identity (&domain->master_clock_identity,
1461 &msg->source_port_identity) != 0)
1464 #ifdef USE_OPPORTUNISTIC_CLOCK_SELECTION
1465 /* Opportunistic selection of master clock */
1466 if (!domain->have_master_clock)
1467 memcpy (&domain->master_clock_identity, &msg->source_port_identity,
1468 sizeof (PtpClockIdentity));
1470 if (!domain->have_master_clock)
1474 domain->sync_interval = log2_to_clock_time (msg->log_message_interval);
1476 /* Check if duplicated */
1477 for (l = domain->pending_syncs.head; l; l = l->next) {
1478 PtpPendingSync *tmp = l->data;
1480 if (tmp->sync_seqnum == msg->sequence_id)
1484 if (msg->message_specific.sync.origin_timestamp.seconds_field >
1485 GST_CLOCK_TIME_NONE / GST_SECOND) {
1486 GST_FIXME ("Unsupported sync message seconds field value: %"
1487 G_GUINT64_FORMAT " > %" G_GUINT64_FORMAT,
1488 msg->message_specific.sync.origin_timestamp.seconds_field,
1489 GST_CLOCK_TIME_NONE / GST_SECOND);
1493 sync = g_new0 (PtpPendingSync, 1);
1494 sync->domain = domain->domain;
1495 sync->sync_seqnum = msg->sequence_id;
1496 sync->sync_recv_time_local = receive_time;
1497 sync->sync_send_time_remote = GST_CLOCK_TIME_NONE;
1498 sync->follow_up_recv_time_local = GST_CLOCK_TIME_NONE;
1499 sync->delay_req_send_time_local = GST_CLOCK_TIME_NONE;
1500 sync->delay_req_recv_time_remote = GST_CLOCK_TIME_NONE;
1501 sync->delay_resp_recv_time_local = GST_CLOCK_TIME_NONE;
1503 /* 0.5 correction factor for division later */
1504 sync->correction_field_sync = msg->correction_field;
1506 if ((msg->flag_field & 0x0200)) {
1507 /* Wait for FOLLOW_UP */
1509 sync->sync_send_time_remote =
1510 PTP_TIMESTAMP_TO_GST_CLOCK_TIME (msg->message_specific.
1511 sync.origin_timestamp);
1513 if (domain->last_ptp_sync_time != 0
1514 && domain->last_ptp_sync_time >= sync->sync_send_time_remote) {
1515 GST_WARNING ("Backwards PTP times in domain %u: %" GST_TIME_FORMAT " >= %"
1516 GST_TIME_FORMAT, domain->domain,
1517 GST_TIME_ARGS (domain->last_ptp_sync_time),
1518 GST_TIME_ARGS (sync->sync_send_time_remote));
1519 ptp_pending_sync_free (sync);
1523 domain->last_ptp_sync_time = sync->sync_send_time_remote;
1525 if (send_delay_req (domain, sync)) {
1526 /* Sent delay request */
1528 update_ptp_time (domain, sync);
1529 ptp_pending_sync_free (sync);
1535 g_queue_push_tail (&domain->pending_syncs, sync);
1539 handle_follow_up_message (PtpMessage * msg, GstClockTime receive_time)
1542 PtpDomainData *domain = NULL;
1543 PtpPendingSync *sync = NULL;
1545 /* Don't consider messages with the alternate master flag set */
1546 if ((msg->flag_field & 0x0100))
1549 for (l = domain_data; l; l = l->next) {
1550 PtpDomainData *tmp = l->data;
1552 if (msg->domain_number == tmp->domain) {
1561 /* If we have a master clock, ignore this message if it's not coming from there */
1562 if (domain->have_master_clock
1563 && compare_clock_identity (&domain->master_clock_identity,
1564 &msg->source_port_identity) != 0)
1567 /* Check if we know about this one */
1568 for (l = domain->pending_syncs.head; l; l = l->next) {
1569 PtpPendingSync *tmp = l->data;
1571 if (tmp->sync_seqnum == msg->sequence_id) {
1580 /* Got a FOLLOW_UP for this already */
1581 if (sync->sync_send_time_remote != GST_CLOCK_TIME_NONE)
1584 if (sync->sync_recv_time_local >= receive_time) {
1585 GST_ERROR ("Got bogus follow up in domain %u: %" GST_TIME_FORMAT " > %"
1586 GST_TIME_FORMAT, domain->domain,
1587 GST_TIME_ARGS (sync->sync_recv_time_local),
1588 GST_TIME_ARGS (receive_time));
1589 g_queue_remove (&domain->pending_syncs, sync);
1590 ptp_pending_sync_free (sync);
1594 sync->correction_field_sync += msg->correction_field;
1595 sync->sync_send_time_remote =
1596 PTP_TIMESTAMP_TO_GST_CLOCK_TIME (msg->message_specific.
1597 follow_up.precise_origin_timestamp);
1598 sync->follow_up_recv_time_local = receive_time;
1600 if (domain->last_ptp_sync_time >= sync->sync_send_time_remote) {
1601 GST_WARNING ("Backwards PTP times in domain %u: %" GST_TIME_FORMAT " >= %"
1602 GST_TIME_FORMAT, domain->domain,
1603 GST_TIME_ARGS (domain->last_ptp_sync_time),
1604 GST_TIME_ARGS (sync->sync_send_time_remote));
1605 g_queue_remove (&domain->pending_syncs, sync);
1606 ptp_pending_sync_free (sync);
1610 domain->last_ptp_sync_time = sync->sync_send_time_remote;
1612 if (send_delay_req (domain, sync)) {
1613 /* Sent delay request */
1615 update_ptp_time (domain, sync);
1616 g_queue_remove (&domain->pending_syncs, sync);
1617 ptp_pending_sync_free (sync);
1623 handle_delay_resp_message (PtpMessage * msg, GstClockTime receive_time)
1626 PtpDomainData *domain = NULL;
1627 PtpPendingSync *sync = NULL;
1629 /* Don't consider messages with the alternate master flag set */
1630 if ((msg->flag_field & 0x0100))
1633 for (l = domain_data; l; l = l->next) {
1634 PtpDomainData *tmp = l->data;
1636 if (msg->domain_number == tmp->domain) {
1645 /* If we have a master clock, ignore this message if it's not coming from there */
1646 if (domain->have_master_clock
1647 && compare_clock_identity (&domain->master_clock_identity,
1648 &msg->source_port_identity) != 0)
1652 if (msg->message_specific.delay_resp.
1653 requesting_port_identity.clock_identity != ptp_clock_id.clock_identity
1654 || msg->message_specific.delay_resp.
1655 requesting_port_identity.port_number != ptp_clock_id.port_number)
1658 domain->min_delay_req_interval =
1659 log2_to_clock_time (msg->log_message_interval);
1661 /* Check if we know about this one */
1662 for (l = domain->pending_syncs.head; l; l = l->next) {
1663 PtpPendingSync *tmp = l->data;
1665 if (tmp->delay_req_seqnum == msg->sequence_id) {
1674 /* Got a DELAY_RESP for this already */
1675 if (sync->delay_req_recv_time_remote != GST_CLOCK_TIME_NONE)
1678 if (sync->delay_req_send_time_local > receive_time) {
1679 GST_ERROR ("Got bogus delay response in domain %u: %" GST_TIME_FORMAT " > %"
1680 GST_TIME_FORMAT, domain->domain,
1681 GST_TIME_ARGS (sync->delay_req_send_time_local),
1682 GST_TIME_ARGS (receive_time));
1683 g_queue_remove (&domain->pending_syncs, sync);
1684 ptp_pending_sync_free (sync);
1688 sync->correction_field_delay = msg->correction_field;
1690 sync->delay_req_recv_time_remote =
1691 PTP_TIMESTAMP_TO_GST_CLOCK_TIME (msg->message_specific.
1692 delay_resp.receive_timestamp);
1693 sync->delay_resp_recv_time_local = receive_time;
1695 if (domain->mean_path_delay != 0
1696 && sync->sync_send_time_remote > sync->delay_req_recv_time_remote) {
1697 GST_WARNING ("Sync send time after delay req receive time for domain %u: %"
1698 GST_TIME_FORMAT " > %" GST_TIME_FORMAT, domain->domain,
1699 GST_TIME_ARGS (sync->sync_send_time_remote),
1700 GST_TIME_ARGS (sync->delay_req_recv_time_remote));
1701 g_queue_remove (&domain->pending_syncs, sync);
1702 ptp_pending_sync_free (sync);
1706 if (update_mean_path_delay (domain, sync))
1707 update_ptp_time (domain, sync);
1708 g_queue_remove (&domain->pending_syncs, sync);
1709 ptp_pending_sync_free (sync);
1713 handle_ptp_message (PtpMessage * msg, GstClockTime receive_time)
1715 /* Ignore our own messages */
1716 if (msg->source_port_identity.clock_identity == ptp_clock_id.clock_identity &&
1717 msg->source_port_identity.port_number == ptp_clock_id.port_number)
1720 switch (msg->message_type) {
1721 case PTP_MESSAGE_TYPE_ANNOUNCE:
1722 handle_announce_message (msg, receive_time);
1724 case PTP_MESSAGE_TYPE_SYNC:
1725 handle_sync_message (msg, receive_time);
1727 case PTP_MESSAGE_TYPE_FOLLOW_UP:
1728 handle_follow_up_message (msg, receive_time);
1730 case PTP_MESSAGE_TYPE_DELAY_RESP:
1731 handle_delay_resp_message (msg, receive_time);
1739 have_stdin_data_cb (GIOChannel * channel, GIOCondition condition,
1748 if ((condition & G_IO_STATUS_EOF)) {
1749 GST_ERROR ("Got EOF on stdin");
1750 g_main_loop_quit (main_loop);
1751 return G_SOURCE_REMOVE;
1755 g_io_channel_read_chars (channel, (gchar *) & header, sizeof (header),
1757 if (status == G_IO_STATUS_ERROR) {
1758 GST_ERROR ("Failed to read from stdin: %s", err->message);
1759 g_clear_error (&err);
1760 g_main_loop_quit (main_loop);
1761 return G_SOURCE_REMOVE;
1762 } else if (status == G_IO_STATUS_EOF) {
1763 GST_ERROR ("Got EOF on stdin");
1764 g_main_loop_quit (main_loop);
1765 return G_SOURCE_REMOVE;
1766 } else if (status != G_IO_STATUS_NORMAL) {
1767 GST_ERROR ("Unexpected stdin read status: %d", status);
1768 g_main_loop_quit (main_loop);
1769 return G_SOURCE_REMOVE;
1770 } else if (read != sizeof (header)) {
1771 GST_ERROR ("Unexpected read size: %" G_GSIZE_FORMAT, read);
1772 g_main_loop_quit (main_loop);
1773 return G_SOURCE_REMOVE;
1774 } else if (header.size > 8192) {
1775 GST_ERROR ("Unexpected size: %u", header.size);
1776 g_main_loop_quit (main_loop);
1777 return G_SOURCE_REMOVE;
1780 status = g_io_channel_read_chars (channel, buffer, header.size, &read, &err);
1781 if (status == G_IO_STATUS_ERROR) {
1782 GST_ERROR ("Failed to read from stdin: %s", err->message);
1783 g_clear_error (&err);
1784 g_main_loop_quit (main_loop);
1785 return G_SOURCE_REMOVE;
1786 } else if (status == G_IO_STATUS_EOF) {
1787 GST_ERROR ("EOF on stdin");
1788 g_main_loop_quit (main_loop);
1789 return G_SOURCE_REMOVE;
1790 } else if (status != G_IO_STATUS_NORMAL) {
1791 GST_ERROR ("Unexpected stdin read status: %d", status);
1792 g_main_loop_quit (main_loop);
1793 return G_SOURCE_REMOVE;
1794 } else if (read != header.size) {
1795 GST_ERROR ("Unexpected read size: %" G_GSIZE_FORMAT, read);
1796 g_main_loop_quit (main_loop);
1797 return G_SOURCE_REMOVE;
1800 switch (header.type) {
1803 GstClockTime receive_time = gst_clock_get_time (observation_system_clock);
1806 if (parse_ptp_message (&msg, (const guint8 *) buffer, header.size)) {
1807 dump_ptp_message (&msg);
1808 handle_ptp_message (&msg, receive_time);
1813 case TYPE_CLOCK_ID:{
1814 if (header.size != 8) {
1815 GST_ERROR ("Unexpected clock id size (%u != 8)", header.size);
1816 g_main_loop_quit (main_loop);
1817 return G_SOURCE_REMOVE;
1819 g_mutex_lock (&ptp_lock);
1820 ptp_clock_id.clock_identity = GST_READ_UINT64_BE (buffer);
1821 ptp_clock_id.port_number = getpid ();
1822 GST_DEBUG ("Got clock id 0x%016" G_GINT64_MODIFIER "x %u",
1823 ptp_clock_id.clock_identity, ptp_clock_id.port_number);
1824 g_cond_signal (&ptp_cond);
1825 g_mutex_unlock (&ptp_lock);
1830 return G_SOURCE_CONTINUE;
1833 /* Cleanup all announce messages and announce message senders
1834 * that are timed out by now, and clean up all pending syncs
1835 * that are missing their FOLLOW_UP or DELAY_RESP */
1837 cleanup_cb (gpointer data)
1839 GstClockTime now = gst_clock_get_time (observation_system_clock);
1842 for (l = domain_data; l; l = l->next) {
1843 PtpDomainData *domain = l->data;
1845 for (n = domain->announce_senders; n;) {
1846 PtpAnnounceSender *sender = n->data;
1847 gboolean timed_out = TRUE;
1849 /* Keep only 5 messages per sender around */
1850 while (g_queue_get_length (&sender->announce_messages) > 5) {
1851 PtpAnnounceMessage *msg = g_queue_pop_head (&sender->announce_messages);
1855 for (m = sender->announce_messages.head; m; m = m->next) {
1856 PtpAnnounceMessage *msg = m->data;
1858 if (msg->receive_time +
1859 sender->announce_interval * PTP_ANNOUNCE_RECEIPT_TIMEOUT > now) {
1866 GST_DEBUG ("Announce sender 0x%016" G_GINT64_MODIFIER "x %u timed out",
1867 sender->master_clock_identity.clock_identity,
1868 sender->master_clock_identity.port_number);
1869 g_queue_foreach (&sender->announce_messages, (GFunc) g_free, NULL);
1870 g_queue_clear (&sender->announce_messages);
1873 if (g_queue_get_length (&sender->announce_messages) == 0) {
1874 GList *tmp = n->next;
1876 if (compare_clock_identity (&sender->master_clock_identity,
1877 &domain->master_clock_identity) == 0)
1878 GST_WARNING ("currently selected master clock timed out");
1880 domain->announce_senders =
1881 g_list_delete_link (domain->announce_senders, n);
1887 select_best_master_clock (domain, now);
1889 /* Clean up any pending syncs */
1890 for (n = domain->pending_syncs.head; n;) {
1891 PtpPendingSync *sync = n->data;
1892 gboolean timed_out = FALSE;
1894 /* Time out pending syncs after 4 sync intervals or 10 seconds,
1895 * and pending delay reqs after 4 delay req intervals or 10 seconds
1897 if (sync->delay_req_send_time_local != GST_CLOCK_TIME_NONE &&
1898 ((domain->min_delay_req_interval != 0
1899 && sync->delay_req_send_time_local +
1900 4 * domain->min_delay_req_interval < now)
1901 || (sync->delay_req_send_time_local + 10 * GST_SECOND < now))) {
1903 } else if ((domain->sync_interval != 0
1904 && sync->sync_recv_time_local + 4 * domain->sync_interval < now)
1905 || (sync->sync_recv_time_local + 10 * GST_SECOND < now)) {
1910 GList *tmp = n->next;
1911 ptp_pending_sync_free (sync);
1912 g_queue_delete_link (&domain->pending_syncs, n);
1920 return G_SOURCE_CONTINUE;
1924 ptp_helper_main (gpointer data)
1926 GSource *cleanup_source;
1928 GST_DEBUG ("Starting PTP helper loop");
1930 /* Check all 5 seconds, if we have to cleanup ANNOUNCE or pending syncs message */
1931 cleanup_source = g_timeout_source_new_seconds (5);
1932 g_source_set_priority (cleanup_source, G_PRIORITY_DEFAULT);
1933 g_source_set_callback (cleanup_source, (GSourceFunc) cleanup_cb, NULL, NULL);
1934 g_source_attach (cleanup_source, main_context);
1935 g_source_unref (cleanup_source);
1937 g_main_loop_run (main_loop);
1938 GST_DEBUG ("Stopped PTP helper loop");
1940 g_mutex_lock (&ptp_lock);
1941 ptp_clock_id.clock_identity = GST_PTP_CLOCK_ID_NONE;
1942 ptp_clock_id.port_number = 0;
1944 g_cond_signal (&ptp_cond);
1945 g_mutex_unlock (&ptp_lock);
1951 * gst_ptp_is_supported:
1953 * Check if PTP clocks are generally supported on this system, and if previous
1954 * initializations did not fail.
1956 * Returns: %TRUE if PTP clocks are generally supported on this system, and
1957 * previous initializations did not fail.
1962 gst_ptp_is_supported (void)
1968 * gst_ptp_is_initialized:
1970 * Check if the GStreamer PTP clock subsystem is initialized.
1972 * Returns: %TRUE if the GStreamer PTP clock subsystem is intialized.
1977 gst_ptp_is_initialized (void)
1984 * @clock_id: PTP clock id of this process' clock or %GST_PTP_CLOCK_ID_NONE
1985 * @interfaces: (transfer none) (array zero-terminated=1) (allow-none): network interfaces to run the clock on
1987 * Initialize the GStreamer PTP subsystem and create a PTP ordinary clock in
1988 * slave-only mode for all domains on the given @interfaces with the
1991 * If @clock_id is %GST_PTP_CLOCK_ID_NONE, a clock id is automatically
1992 * generated from the MAC address of the first network interface.
1995 * This function is automatically called by gst_ptp_clock_new() with default
1996 * parameters if it wasn't called before.
1998 * Returns: %TRUE if the GStreamer PTP clock subsystem could be initialized.
2003 gst_ptp_init (guint64 clock_id, gchar ** interfaces)
2007 gchar **argv = NULL;
2011 GSource *stdin_source;
2013 GST_DEBUG_CATEGORY_INIT (ptp_debug, "ptp", 0, "PTP clock");
2015 g_mutex_lock (&ptp_lock);
2017 GST_ERROR ("PTP not supported");
2023 GST_DEBUG ("PTP already initialized");
2028 if (ptp_helper_pid) {
2029 GST_DEBUG ("PTP currently initializing");
2033 if (!domain_stats_hooks_initted) {
2034 g_hook_list_init (&domain_stats_hooks, sizeof (GHook));
2035 domain_stats_hooks_initted = TRUE;
2039 if (clock_id != GST_PTP_CLOCK_ID_NONE)
2041 if (interfaces != NULL)
2042 argc += 2 * g_strv_length (interfaces);
2044 argv = g_new0 (gchar *, argc + 2);
2047 env = g_getenv ("GST_PTP_HELPER_1_0");
2049 env = g_getenv ("GST_PTP_HELPER");
2050 if (env != NULL && *env != '\0') {
2051 GST_LOG ("Trying GST_PTP_HELPER env var: %s", env);
2052 argv[argc_c++] = g_strdup (env);
2054 argv[argc_c++] = g_strdup (GST_PTP_HELPER_INSTALLED);
2057 if (clock_id != GST_PTP_CLOCK_ID_NONE) {
2058 argv[argc_c++] = g_strdup ("-c");
2059 argv[argc_c++] = g_strdup_printf ("0x%016" G_GINT64_MODIFIER "x", clock_id);
2062 if (interfaces != NULL) {
2063 gchar **ptr = interfaces;
2066 argv[argc_c++] = g_strdup ("-i");
2067 argv[argc_c++] = g_strdup (*ptr);
2072 main_context = g_main_context_new ();
2073 main_loop = g_main_loop_new (main_context, FALSE);
2076 g_thread_try_new ("ptp-helper-thread", ptp_helper_main, NULL, &err);
2077 if (!ptp_helper_thread) {
2078 GST_ERROR ("Failed to start PTP helper thread: %s", err->message);
2079 g_clear_error (&err);
2084 if (!g_spawn_async_with_pipes (NULL, argv, NULL, 0, NULL, NULL,
2085 &ptp_helper_pid, &fd_w, &fd_r, NULL, &err)) {
2086 GST_ERROR ("Failed to start ptp helper process: %s", err->message);
2087 g_clear_error (&err);
2093 stdin_channel = g_io_channel_unix_new (fd_r);
2094 g_io_channel_set_encoding (stdin_channel, NULL, NULL);
2095 g_io_channel_set_buffered (stdin_channel, FALSE);
2096 g_io_channel_set_close_on_unref (stdin_channel, TRUE);
2098 g_io_create_watch (stdin_channel, G_IO_IN | G_IO_PRI | G_IO_HUP);
2099 g_source_set_priority (stdin_source, G_PRIORITY_DEFAULT);
2100 g_source_set_callback (stdin_source, (GSourceFunc) have_stdin_data_cb, NULL,
2102 g_source_attach (stdin_source, main_context);
2103 g_source_unref (stdin_source);
2105 /* Create stdout channel */
2106 stdout_channel = g_io_channel_unix_new (fd_w);
2107 g_io_channel_set_encoding (stdout_channel, NULL, NULL);
2108 g_io_channel_set_close_on_unref (stdout_channel, TRUE);
2109 g_io_channel_set_buffered (stdout_channel, FALSE);
2111 delay_req_rand = g_rand_new ();
2112 observation_system_clock =
2113 g_object_new (GST_TYPE_SYSTEM_CLOCK, "name", "ptp-observation-clock",
2119 GST_DEBUG ("Waiting for PTP to be initialized");
2121 while (ptp_clock_id.clock_identity == GST_PTP_CLOCK_ID_NONE && initted)
2122 g_cond_wait (&ptp_cond, &ptp_lock);
2126 GST_DEBUG ("Initialized and got clock id 0x%016" G_GINT64_MODIFIER "x %u",
2127 ptp_clock_id.clock_identity, ptp_clock_id.port_number);
2129 GST_ERROR ("Failed to initialize");
2137 if (ptp_helper_pid) {
2139 kill (ptp_helper_pid, SIGKILL);
2140 waitpid (ptp_helper_pid, NULL, 0);
2142 TerminateProcess (ptp_helper_pid, 1);
2143 WaitForSingleObject (ptp_helper_pid, INFINITE);
2145 g_spawn_close_pid (ptp_helper_pid);
2150 g_io_channel_unref (stdin_channel);
2151 stdin_channel = NULL;
2153 g_io_channel_unref (stdout_channel);
2154 stdout_channel = NULL;
2156 if (main_loop && ptp_helper_thread) {
2157 g_main_loop_quit (main_loop);
2158 g_thread_join (ptp_helper_thread);
2160 ptp_helper_thread = NULL;
2162 g_main_loop_unref (main_loop);
2165 g_main_context_unref (main_context);
2166 main_context = NULL;
2169 g_rand_free (delay_req_rand);
2170 delay_req_rand = NULL;
2172 if (observation_system_clock)
2173 gst_object_unref (observation_system_clock);
2174 observation_system_clock = NULL;
2177 g_mutex_unlock (&ptp_lock);
2185 * Deinitialize the GStreamer PTP subsystem and stop the PTP clock. If there
2186 * are any remaining GstPtpClock instances, they won't be further synchronized
2187 * to the PTP network clock.
2192 gst_ptp_deinit (void)
2196 g_mutex_lock (&ptp_lock);
2198 if (ptp_helper_pid) {
2200 kill (ptp_helper_pid, SIGKILL);
2201 waitpid (ptp_helper_pid, NULL, 0);
2203 TerminateProcess (ptp_helper_pid, 1);
2204 WaitForSingleObject (ptp_helper_pid, INFINITE);
2206 g_spawn_close_pid (ptp_helper_pid);
2211 g_io_channel_unref (stdin_channel);
2212 stdin_channel = NULL;
2214 g_io_channel_unref (stdout_channel);
2215 stdout_channel = NULL;
2217 if (main_loop && ptp_helper_thread) {
2218 GThread *tmp = ptp_helper_thread;
2219 ptp_helper_thread = NULL;
2220 g_mutex_unlock (&ptp_lock);
2221 g_main_loop_quit (main_loop);
2222 g_thread_join (tmp);
2223 g_mutex_lock (&ptp_lock);
2226 g_main_loop_unref (main_loop);
2229 g_main_context_unref (main_context);
2230 main_context = NULL;
2233 g_rand_free (delay_req_rand);
2234 delay_req_rand = NULL;
2235 if (observation_system_clock)
2236 gst_object_unref (observation_system_clock);
2237 observation_system_clock = NULL;
2239 for (l = domain_data; l; l = l->next) {
2240 PtpDomainData *domain = l->data;
2242 for (m = domain->announce_senders; m; m = m->next) {
2243 PtpAnnounceSender *sender = m->data;
2245 g_queue_foreach (&sender->announce_messages, (GFunc) g_free, NULL);
2246 g_queue_clear (&sender->announce_messages);
2249 g_list_free (domain->announce_senders);
2251 g_queue_foreach (&domain->pending_syncs, (GFunc) ptp_pending_sync_free,
2253 g_queue_clear (&domain->pending_syncs);
2254 gst_object_unref (domain->domain_clock);
2257 g_list_free (domain_data);
2259 g_list_foreach (domain_clocks, (GFunc) g_free, NULL);
2260 g_list_free (domain_clocks);
2261 domain_clocks = NULL;
2263 ptp_clock_id.clock_identity = GST_PTP_CLOCK_ID_NONE;
2264 ptp_clock_id.port_number = 0;
2268 g_mutex_unlock (&ptp_lock);
2271 #define DEFAULT_DOMAIN 0
2277 PROP_INTERNAL_CLOCK,
2278 PROP_MASTER_CLOCK_ID,
2279 PROP_GRANDMASTER_CLOCK_ID
2282 #define GST_PTP_CLOCK_GET_PRIVATE(obj) \
2283 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_PTP_CLOCK, GstPtpClockPrivate))
2285 struct _GstPtpClockPrivate
2288 GstClock *domain_clock;
2289 gulong domain_stats_id;
2292 #define gst_ptp_clock_parent_class parent_class
2293 G_DEFINE_TYPE (GstPtpClock, gst_ptp_clock, GST_TYPE_SYSTEM_CLOCK);
2295 static void gst_ptp_clock_set_property (GObject * object, guint prop_id,
2296 const GValue * value, GParamSpec * pspec);
2297 static void gst_ptp_clock_get_property (GObject * object, guint prop_id,
2298 GValue * value, GParamSpec * pspec);
2299 static void gst_ptp_clock_finalize (GObject * object);
2301 static GstClockTime gst_ptp_clock_get_internal_time (GstClock * clock);
2304 gst_ptp_clock_class_init (GstPtpClockClass * klass)
2306 GObjectClass *gobject_class;
2307 GstClockClass *clock_class;
2309 gobject_class = G_OBJECT_CLASS (klass);
2310 clock_class = GST_CLOCK_CLASS (klass);
2312 g_type_class_add_private (klass, sizeof (GstPtpClockPrivate));
2314 gobject_class->finalize = gst_ptp_clock_finalize;
2315 gobject_class->get_property = gst_ptp_clock_get_property;
2316 gobject_class->set_property = gst_ptp_clock_set_property;
2318 g_object_class_install_property (gobject_class, PROP_DOMAIN,
2319 g_param_spec_uint ("domain", "Domain",
2320 "The PTP domain", 0, G_MAXUINT8,
2322 G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
2324 g_object_class_install_property (gobject_class, PROP_INTERNAL_CLOCK,
2325 g_param_spec_object ("internal-clock", "Internal Clock",
2326 "Internal clock", GST_TYPE_CLOCK,
2327 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
2329 g_object_class_install_property (gobject_class, PROP_MASTER_CLOCK_ID,
2330 g_param_spec_uint64 ("master-clock-id", "Master Clock ID",
2331 "Master Clock ID", 0, G_MAXUINT64, 0,
2332 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
2334 g_object_class_install_property (gobject_class, PROP_GRANDMASTER_CLOCK_ID,
2335 g_param_spec_uint64 ("grandmaster-clock-id", "Grand Master Clock ID",
2336 "Grand Master Clock ID", 0, G_MAXUINT64, 0,
2337 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
2339 clock_class->get_internal_time = gst_ptp_clock_get_internal_time;
2343 gst_ptp_clock_init (GstPtpClock * self)
2345 GstPtpClockPrivate *priv;
2347 self->priv = priv = GST_PTP_CLOCK_GET_PRIVATE (self);
2349 GST_OBJECT_FLAG_SET (self, GST_CLOCK_FLAG_CAN_SET_MASTER);
2350 GST_OBJECT_FLAG_SET (self, GST_CLOCK_FLAG_NEEDS_STARTUP_SYNC);
2352 priv->domain = DEFAULT_DOMAIN;
2356 gst_ptp_clock_ensure_domain_clock (GstPtpClock * self)
2358 gboolean got_clock = TRUE;
2360 if (G_UNLIKELY (!self->priv->domain_clock)) {
2361 g_mutex_lock (&domain_clocks_lock);
2362 if (!self->priv->domain_clock) {
2367 for (l = domain_clocks; l; l = l->next) {
2368 PtpDomainData *clock_data = l->data;
2370 if (clock_data->domain == self->priv->domain
2371 && clock_data->last_ptp_time != 0) {
2372 self->priv->domain_clock = clock_data->domain_clock;
2378 g_mutex_unlock (&domain_clocks_lock);
2380 g_object_notify (G_OBJECT (self), "internal-clock");
2381 gst_clock_set_synced (GST_CLOCK (self), TRUE);
2389 gst_ptp_clock_stats_callback (guint8 domain, const GstStructure * stats,
2392 GstPtpClock *self = user_data;
2394 if (domain != self->priv->domain
2395 || !gst_structure_has_name (stats, GST_PTP_STATISTICS_TIME_UPDATED))
2398 /* Let's set our internal clock */
2399 if (!gst_ptp_clock_ensure_domain_clock (self))
2402 self->priv->domain_stats_id = 0;
2408 gst_ptp_clock_set_property (GObject * object, guint prop_id,
2409 const GValue * value, GParamSpec * pspec)
2411 GstPtpClock *self = GST_PTP_CLOCK (object);
2415 self->priv->domain = g_value_get_uint (value);
2416 gst_ptp_clock_ensure_domain_clock (self);
2417 if (!self->priv->domain_clock)
2418 self->priv->domain_stats_id =
2419 gst_ptp_statistics_callback_add (gst_ptp_clock_stats_callback, self,
2423 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
2429 gst_ptp_clock_get_property (GObject * object, guint prop_id,
2430 GValue * value, GParamSpec * pspec)
2432 GstPtpClock *self = GST_PTP_CLOCK (object);
2436 g_value_set_uint (value, self->priv->domain);
2438 case PROP_INTERNAL_CLOCK:
2439 gst_ptp_clock_ensure_domain_clock (self);
2440 g_value_set_object (value, self->priv->domain_clock);
2442 case PROP_MASTER_CLOCK_ID:
2443 case PROP_GRANDMASTER_CLOCK_ID:{
2446 g_mutex_lock (&domain_clocks_lock);
2447 g_value_set_uint64 (value, 0);
2449 for (l = domain_clocks; l; l = l->next) {
2450 PtpDomainData *clock_data = l->data;
2452 if (clock_data->domain == self->priv->domain) {
2453 if (prop_id == PROP_MASTER_CLOCK_ID)
2454 g_value_set_uint64 (value,
2455 clock_data->master_clock_identity.clock_identity);
2457 g_value_set_uint64 (value, clock_data->grandmaster_identity);
2461 g_mutex_unlock (&domain_clocks_lock);
2465 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
2471 gst_ptp_clock_finalize (GObject * object)
2473 GstPtpClock *self = GST_PTP_CLOCK (object);
2475 if (self->priv->domain_stats_id)
2476 gst_ptp_statistics_callback_remove (self->priv->domain_stats_id);
2478 G_OBJECT_CLASS (gst_ptp_clock_parent_class)->finalize (object);
2482 gst_ptp_clock_get_internal_time (GstClock * clock)
2484 GstPtpClock *self = GST_PTP_CLOCK (clock);
2486 gst_ptp_clock_ensure_domain_clock (self);
2488 if (!self->priv->domain_clock) {
2489 GST_ERROR_OBJECT (self, "Domain %u has no clock yet and is not synced",
2490 self->priv->domain);
2491 return GST_CLOCK_TIME_NONE;
2494 return gst_clock_get_time (self->priv->domain_clock);
2498 * gst_ptp_clock_new:
2499 * @name: Name of the clock
2500 * @domain: PTP domain
2502 * Creates a new PTP clock instance that exports the PTP time of the master
2503 * clock in @domain. This clock can be slaved to other clocks as needed.
2505 * If gst_ptp_init() was not called before, this will call gst_ptp_init() with
2506 * 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);