/* GStreamer
* Copyright (C) 2015 Sebastian Dröge <sebastian@centricular.com>
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstptpclock
* @title: GstPtpClock
* @short_description: Special clock that synchronizes to a remote time
* provider via PTP (IEEE1588:2008).
* @see_also: #GstClock, #GstNetClientClock, #GstPipeline
*
* GstPtpClock implements a PTP (IEEE1588:2008) ordinary clock in slave-only
* mode, that allows a GStreamer pipeline to synchronize to a PTP network
* clock in some specific domain.
*
* The PTP subsystem can be initialized with gst_ptp_init(), which then starts
* a helper process to do the actual communication via the PTP ports. This is
* required as PTP listens on ports < 1024 and thus requires special
* privileges. Once this helper process is started, the main process will
* synchronize to all PTP domains that are detected on the selected
* interfaces.
*
* gst_ptp_clock_new() then allows to create a GstClock that provides the PTP
* time from a master clock inside a specific PTP domain. This clock will only
* return valid timestamps once the timestamps in the PTP domain are known. To
* check this, you can use gst_clock_wait_for_sync(), the GstClock::synced
* signal and gst_clock_is_synced().
*
* To gather statistics about the PTP clock synchronization,
* gst_ptp_statistics_callback_add() can be used. This gives the application
* the possibility to collect all kinds of statistics from the clock
* synchronization.
*
* Since: 1.6
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstptpclock.h"
#include "gstptp_private.h"
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef G_OS_WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#elif defined(G_OS_WIN32)
#include <io.h>
#endif
#include <gst/base/base.h>
GST_DEBUG_CATEGORY_STATIC (ptp_debug);
#define GST_CAT_DEFAULT (ptp_debug)
/* IEEE 1588 7.7.3.1 */
#define PTP_ANNOUNCE_RECEIPT_TIMEOUT 4
/* Use a running average for calculating the mean path delay instead
* of just using the last measurement. Enabling this helps in unreliable
* networks, like wifi, with often changing delays
*
* Undef for following IEEE1588-2008 by the letter
*/
#define USE_RUNNING_AVERAGE_DELAY 1
/* Filter out any measurements that are above a certain threshold compared to
* previous measurements. Enabling this helps filtering out outliers that
* happen fairly often in unreliable networks, like wifi.
*
* Undef for following IEEE1588-2008 by the letter
*/
#define USE_MEASUREMENT_FILTERING 1
/* Select the first clock from which we capture a SYNC message as the master
* clock of the domain until we are ready to run the best master clock
* algorithm. This allows faster syncing but might mean a change of the master
* clock in the beginning. As all clocks in a domain are supposed to use the
* same time, this shouldn't be much of a problem.
*
* Undef for following IEEE1588-2008 by the letter
*/
#define USE_OPPORTUNISTIC_CLOCK_SELECTION 1
/* Only consider SYNC messages for which we are allowed to send a DELAY_REQ
* afterwards. This allows better synchronization in networks with varying
* delays, as for every other SYNC message we would have to assume that it's
* the average of what we saw before. But that might be completely off
*/
#define USE_ONLY_SYNC_WITH_DELAY 1
/* Filter out delay measurements that are too far away from the median of the
* last delay measurements, currently those that are more than 2 times as big.
* This increases accuracy a lot on wifi.
*/
#define USE_MEDIAN_PRE_FILTERING 1
#define MEDIAN_PRE_FILTERING_WINDOW 9
/* How many updates should be skipped at maximum when using USE_MEASUREMENT_FILTERING */
#define MAX_SKIPPED_UPDATES 5
typedef enum
{
PTP_MESSAGE_TYPE_SYNC = 0x0,
PTP_MESSAGE_TYPE_DELAY_REQ = 0x1,
PTP_MESSAGE_TYPE_PDELAY_REQ = 0x2,
PTP_MESSAGE_TYPE_PDELAY_RESP = 0x3,
PTP_MESSAGE_TYPE_FOLLOW_UP = 0x8,
PTP_MESSAGE_TYPE_DELAY_RESP = 0x9,
PTP_MESSAGE_TYPE_PDELAY_RESP_FOLLOW_UP = 0xA,
PTP_MESSAGE_TYPE_ANNOUNCE = 0xB,
PTP_MESSAGE_TYPE_SIGNALING = 0xC,
PTP_MESSAGE_TYPE_MANAGEMENT = 0xD
} PtpMessageType;
typedef struct
{
guint64 seconds_field; /* 48 bits valid */
guint32 nanoseconds_field;
} PtpTimestamp;
#define PTP_TIMESTAMP_TO_GST_CLOCK_TIME(ptp) (ptp.seconds_field * GST_SECOND + ptp.nanoseconds_field)
#define GST_CLOCK_TIME_TO_PTP_TIMESTAMP_SECONDS(gst) (((GstClockTime) gst) / GST_SECOND)
#define GST_CLOCK_TIME_TO_PTP_TIMESTAMP_NANOSECONDS(gst) (((GstClockTime) gst) % GST_SECOND)
typedef struct
{
guint64 clock_identity;
guint16 port_number;
} PtpClockIdentity;
static gint
compare_clock_identity (const PtpClockIdentity * a, const PtpClockIdentity * b)
{
if (a->clock_identity < b->clock_identity)
return -1;
else if (a->clock_identity > b->clock_identity)
return 1;
if (a->port_number < b->port_number)
return -1;
else if (a->port_number > b->port_number)
return 1;
return 0;
}
typedef struct
{
guint8 clock_class;
guint8 clock_accuracy;
guint16 offset_scaled_log_variance;
} PtpClockQuality;
typedef struct
{
guint8 transport_specific;
PtpMessageType message_type;
/* guint8 reserved; */
guint8 version_ptp;
guint16 message_length;
guint8 domain_number;
/* guint8 reserved; */
guint16 flag_field;
gint64 correction_field; /* 48.16 fixed point nanoseconds */
/* guint32 reserved; */
PtpClockIdentity source_port_identity;
guint16 sequence_id;
guint8 control_field;
gint8 log_message_interval;
union
{
struct
{
PtpTimestamp origin_timestamp;
gint16 current_utc_offset;
/* guint8 reserved; */
guint8 grandmaster_priority_1;
PtpClockQuality grandmaster_clock_quality;
guint8 grandmaster_priority_2;
guint64 grandmaster_identity;
guint16 steps_removed;
guint8 time_source;
} announce;
struct
{
PtpTimestamp origin_timestamp;
} sync;
struct
{
PtpTimestamp precise_origin_timestamp;
} follow_up;
struct
{
PtpTimestamp origin_timestamp;
} delay_req;
struct
{
PtpTimestamp receive_timestamp;
PtpClockIdentity requesting_port_identity;
} delay_resp;
} message_specific;
} PtpMessage;
static GMutex ptp_lock;
static GCond ptp_cond;
static gboolean initted = FALSE;
#ifdef HAVE_PTP
static gboolean supported = TRUE;
#else
static gboolean supported = FALSE;
#endif
static GPid ptp_helper_pid;
static GThread *ptp_helper_thread;
static GMainContext *main_context;
static GMainLoop *main_loop;
static GIOChannel *stdin_channel, *stdout_channel;
static GRand *delay_req_rand;
static GstClock *observation_system_clock;
static PtpClockIdentity ptp_clock_id = { GST_PTP_CLOCK_ID_NONE, 0 };
typedef struct
{
GstClockTime receive_time;
PtpClockIdentity master_clock_identity;
guint8 grandmaster_priority_1;
PtpClockQuality grandmaster_clock_quality;
guint8 grandmaster_priority_2;
guint64 grandmaster_identity;
guint16 steps_removed;
guint8 time_source;
guint16 sequence_id;
} PtpAnnounceMessage;
typedef struct
{
PtpClockIdentity master_clock_identity;
GstClockTime announce_interval; /* last interval we received */
GQueue announce_messages;
} PtpAnnounceSender;
typedef struct
{
guint domain;
PtpClockIdentity master_clock_identity;
guint16 sync_seqnum;
GstClockTime sync_recv_time_local; /* t2 */
GstClockTime sync_send_time_remote; /* t1, might be -1 if FOLLOW_UP pending */
GstClockTime follow_up_recv_time_local;
GSource *timeout_source;
guint16 delay_req_seqnum;
GstClockTime delay_req_send_time_local; /* t3, -1 if we wait for FOLLOW_UP */
GstClockTime delay_req_recv_time_remote; /* t4, -1 if we wait */
GstClockTime delay_resp_recv_time_local;
gint64 correction_field_sync; /* sum of the correction fields of SYNC/FOLLOW_UP */
gint64 correction_field_delay; /* sum of the correction fields of DELAY_RESP */
} PtpPendingSync;
static void
ptp_pending_sync_free (PtpPendingSync * sync)
{
if (sync->timeout_source) {
g_source_destroy (sync->timeout_source);
g_source_unref (sync->timeout_source);
}
g_free (sync);
}
typedef struct
{
guint domain;
GstClockTime last_ptp_time;
GstClockTime last_local_time;
gint skipped_updates;
/* Used for selecting the master/grandmaster */
GList *announce_senders;
/* Last selected master clock */
gboolean have_master_clock;
PtpClockIdentity master_clock_identity;
guint64 grandmaster_identity;
/* Last SYNC or FOLLOW_UP timestamp we received */
GstClockTime last_ptp_sync_time;
GstClockTime sync_interval;
GstClockTime mean_path_delay;
GstClockTime last_delay_req, min_delay_req_interval;
guint16 last_delay_req_seqnum;
GstClockTime last_path_delays[MEDIAN_PRE_FILTERING_WINDOW];
gint last_path_delays_missing;
GQueue pending_syncs;
GstClock *domain_clock;
} PtpDomainData;
static GList *domain_data;
static GMutex domain_clocks_lock;
static GList *domain_clocks;
/* Protected by PTP lock */
static void emit_ptp_statistics (guint8 domain, const GstStructure * stats);
static GHookList domain_stats_hooks;
static gint domain_stats_n_hooks;
static gboolean domain_stats_hooks_initted = FALSE;
/* Converts log2 seconds to GstClockTime */
static GstClockTime
log2_to_clock_time (gint l)
{
if (l < 0)
return GST_SECOND >> (-l);
else
return GST_SECOND << l;
}
static void
dump_ptp_message (PtpMessage * msg)
{
GST_TRACE ("PTP message:");
GST_TRACE ("\ttransport_specific: %u", msg->transport_specific);
GST_TRACE ("\tmessage_type: 0x%01x", msg->message_type);
GST_TRACE ("\tversion_ptp: %u", msg->version_ptp);
GST_TRACE ("\tmessage_length: %u", msg->message_length);
GST_TRACE ("\tdomain_number: %u", msg->domain_number);
GST_TRACE ("\tflag_field: 0x%04x", msg->flag_field);
GST_TRACE ("\tcorrection_field: %" G_GINT64_FORMAT ".%03u",
(msg->correction_field / 65536),
(guint) ((msg->correction_field & 0xffff) * 1000) / 65536);
GST_TRACE ("\tsource_port_identity: 0x%016" G_GINT64_MODIFIER "x %u",
msg->source_port_identity.clock_identity,
msg->source_port_identity.port_number);
GST_TRACE ("\tsequence_id: %u", msg->sequence_id);
GST_TRACE ("\tcontrol_field: 0x%02x", msg->control_field);
GST_TRACE ("\tmessage_interval: %" GST_TIME_FORMAT,
GST_TIME_ARGS (log2_to_clock_time (msg->log_message_interval)));
switch (msg->message_type) {
case PTP_MESSAGE_TYPE_ANNOUNCE:
GST_TRACE ("\tANNOUNCE:");
GST_TRACE ("\t\torigin_timestamp: %" G_GUINT64_FORMAT ".%09u",
msg->message_specific.announce.origin_timestamp.seconds_field,
msg->message_specific.announce.origin_timestamp.nanoseconds_field);
GST_TRACE ("\t\tcurrent_utc_offset: %d",
msg->message_specific.announce.current_utc_offset);
GST_TRACE ("\t\tgrandmaster_priority_1: %u",
msg->message_specific.announce.grandmaster_priority_1);
GST_TRACE ("\t\tgrandmaster_clock_quality: 0x%02x 0x%02x %u",
msg->message_specific.announce.grandmaster_clock_quality.clock_class,
msg->message_specific.announce.
grandmaster_clock_quality.clock_accuracy,
msg->message_specific.announce.
grandmaster_clock_quality.offset_scaled_log_variance);
GST_TRACE ("\t\tgrandmaster_priority_2: %u",
msg->message_specific.announce.grandmaster_priority_2);
GST_TRACE ("\t\tgrandmaster_identity: 0x%016" G_GINT64_MODIFIER "x",
msg->message_specific.announce.grandmaster_identity);
GST_TRACE ("\t\tsteps_removed: %u",
msg->message_specific.announce.steps_removed);
GST_TRACE ("\t\ttime_source: 0x%02x",
msg->message_specific.announce.time_source);
break;
case PTP_MESSAGE_TYPE_SYNC:
GST_TRACE ("\tSYNC:");
GST_TRACE ("\t\torigin_timestamp: %" G_GUINT64_FORMAT ".%09u",
msg->message_specific.sync.origin_timestamp.seconds_field,
msg->message_specific.sync.origin_timestamp.nanoseconds_field);
break;
case PTP_MESSAGE_TYPE_FOLLOW_UP:
GST_TRACE ("\tFOLLOW_UP:");
GST_TRACE ("\t\tprecise_origin_timestamp: %" G_GUINT64_FORMAT ".%09u",
msg->message_specific.follow_up.
precise_origin_timestamp.seconds_field,
msg->message_specific.follow_up.
precise_origin_timestamp.nanoseconds_field);
break;
case PTP_MESSAGE_TYPE_DELAY_REQ:
GST_TRACE ("\tDELAY_REQ:");
GST_TRACE ("\t\torigin_timestamp: %" G_GUINT64_FORMAT ".%09u",
msg->message_specific.delay_req.origin_timestamp.seconds_field,
msg->message_specific.delay_req.origin_timestamp.nanoseconds_field);
break;
case PTP_MESSAGE_TYPE_DELAY_RESP:
GST_TRACE ("\tDELAY_RESP:");
GST_TRACE ("\t\treceive_timestamp: %" G_GUINT64_FORMAT ".%09u",
msg->message_specific.delay_resp.receive_timestamp.seconds_field,
msg->message_specific.delay_resp.receive_timestamp.nanoseconds_field);
GST_TRACE ("\t\trequesting_port_identity: 0x%016" G_GINT64_MODIFIER
"x %u",
msg->message_specific.delay_resp.
requesting_port_identity.clock_identity,
msg->message_specific.delay_resp.
requesting_port_identity.port_number);
break;
default:
break;
}
GST_TRACE (" ");
}
/* IEEE 1588-2008 5.3.3 */
static gboolean
parse_ptp_timestamp (PtpTimestamp * timestamp, GstByteReader * reader)
{
g_return_val_if_fail (gst_byte_reader_get_remaining (reader) >= 10, FALSE);
timestamp->seconds_field =
(((guint64) gst_byte_reader_get_uint32_be_unchecked (reader)) << 16) |
gst_byte_reader_get_uint16_be_unchecked (reader);
timestamp->nanoseconds_field =
gst_byte_reader_get_uint32_be_unchecked (reader);
if (timestamp->nanoseconds_field >= 1000000000)
return FALSE;
return TRUE;
}
/* IEEE 1588-2008 13.3 */
static gboolean
parse_ptp_message_header (PtpMessage * msg, GstByteReader * reader)
{
guint8 b;
g_return_val_if_fail (gst_byte_reader_get_remaining (reader) >= 34, FALSE);
b = gst_byte_reader_get_uint8_unchecked (reader);
msg->transport_specific = b >> 4;
msg->message_type = b & 0x0f;
b = gst_byte_reader_get_uint8_unchecked (reader);
msg->version_ptp = b & 0x0f;
if (msg->version_ptp != 2) {
GST_WARNING ("Unsupported PTP message version (%u != 2)", msg->version_ptp);
return FALSE;
}
msg->message_length = gst_byte_reader_get_uint16_be_unchecked (reader);
if (gst_byte_reader_get_remaining (reader) + 4 < msg->message_length) {
GST_WARNING ("Not enough data (%u < %u)",
gst_byte_reader_get_remaining (reader) + 4, msg->message_length);
return FALSE;
}
msg->domain_number = gst_byte_reader_get_uint8_unchecked (reader);
gst_byte_reader_skip_unchecked (reader, 1);
msg->flag_field = gst_byte_reader_get_uint16_be_unchecked (reader);
msg->correction_field = gst_byte_reader_get_uint64_be_unchecked (reader);
gst_byte_reader_skip_unchecked (reader, 4);
msg->source_port_identity.clock_identity =
gst_byte_reader_get_uint64_be_unchecked (reader);
msg->source_port_identity.port_number =
gst_byte_reader_get_uint16_be_unchecked (reader);
msg->sequence_id = gst_byte_reader_get_uint16_be_unchecked (reader);
msg->control_field = gst_byte_reader_get_uint8_unchecked (reader);
msg->log_message_interval = gst_byte_reader_get_uint8_unchecked (reader);
return TRUE;
}
/* IEEE 1588-2008 13.5 */
static gboolean
parse_ptp_message_announce (PtpMessage * msg, GstByteReader * reader)
{
g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_ANNOUNCE, FALSE);
if (gst_byte_reader_get_remaining (reader) < 20)
return FALSE;
if (!parse_ptp_timestamp (&msg->message_specific.announce.origin_timestamp,
reader))
return FALSE;
msg->message_specific.announce.current_utc_offset =
gst_byte_reader_get_uint16_be_unchecked (reader);
gst_byte_reader_skip_unchecked (reader, 1);
msg->message_specific.announce.grandmaster_priority_1 =
gst_byte_reader_get_uint8_unchecked (reader);
msg->message_specific.announce.grandmaster_clock_quality.clock_class =
gst_byte_reader_get_uint8_unchecked (reader);
msg->message_specific.announce.grandmaster_clock_quality.clock_accuracy =
gst_byte_reader_get_uint8_unchecked (reader);
msg->message_specific.announce.
grandmaster_clock_quality.offset_scaled_log_variance =
gst_byte_reader_get_uint16_be_unchecked (reader);
msg->message_specific.announce.grandmaster_priority_2 =
gst_byte_reader_get_uint8_unchecked (reader);
msg->message_specific.announce.grandmaster_identity =
gst_byte_reader_get_uint64_be_unchecked (reader);
msg->message_specific.announce.steps_removed =
gst_byte_reader_get_uint16_be_unchecked (reader);
msg->message_specific.announce.time_source =
gst_byte_reader_get_uint8_unchecked (reader);
return TRUE;
}
/* IEEE 1588-2008 13.6 */
static gboolean
parse_ptp_message_sync (PtpMessage * msg, GstByteReader * reader)
{
g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_SYNC, FALSE);
if (gst_byte_reader_get_remaining (reader) < 10)
return FALSE;
if (!parse_ptp_timestamp (&msg->message_specific.sync.origin_timestamp,
reader))
return FALSE;
return TRUE;
}
/* IEEE 1588-2008 13.6 */
static gboolean
parse_ptp_message_delay_req (PtpMessage * msg, GstByteReader * reader)
{
g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_DELAY_REQ, FALSE);
if (gst_byte_reader_get_remaining (reader) < 10)
return FALSE;
if (!parse_ptp_timestamp (&msg->message_specific.delay_req.origin_timestamp,
reader))
return FALSE;
return TRUE;
}
/* IEEE 1588-2008 13.7 */
static gboolean
parse_ptp_message_follow_up (PtpMessage * msg, GstByteReader * reader)
{
g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_FOLLOW_UP, FALSE);
if (gst_byte_reader_get_remaining (reader) < 10)
return FALSE;
if (!parse_ptp_timestamp (&msg->message_specific.
follow_up.precise_origin_timestamp, reader))
return FALSE;
return TRUE;
}
/* IEEE 1588-2008 13.8 */
static gboolean
parse_ptp_message_delay_resp (PtpMessage * msg, GstByteReader * reader)
{
g_return_val_if_fail (msg->message_type == PTP_MESSAGE_TYPE_DELAY_RESP,
FALSE);
if (gst_byte_reader_get_remaining (reader) < 20)
return FALSE;
if (!parse_ptp_timestamp (&msg->message_specific.delay_resp.receive_timestamp,
reader))
return FALSE;
msg->message_specific.delay_resp.requesting_port_identity.clock_identity =
gst_byte_reader_get_uint64_be_unchecked (reader);
msg->message_specific.delay_resp.requesting_port_identity.port_number =
gst_byte_reader_get_uint16_be_unchecked (reader);
return TRUE;
}
static gboolean
parse_ptp_message (PtpMessage * msg, const guint8 * data, gsize size)
{
GstByteReader reader;
gboolean ret = FALSE;
gst_byte_reader_init (&reader, data, size);
if (!parse_ptp_message_header (msg, &reader)) {
GST_WARNING ("Failed to parse PTP message header");
return FALSE;
}
switch (msg->message_type) {
case PTP_MESSAGE_TYPE_SYNC:
ret = parse_ptp_message_sync (msg, &reader);
break;
case PTP_MESSAGE_TYPE_FOLLOW_UP:
ret = parse_ptp_message_follow_up (msg, &reader);
break;
case PTP_MESSAGE_TYPE_DELAY_REQ:
ret = parse_ptp_message_delay_req (msg, &reader);
break;
case PTP_MESSAGE_TYPE_DELAY_RESP:
ret = parse_ptp_message_delay_resp (msg, &reader);
break;
case PTP_MESSAGE_TYPE_ANNOUNCE:
ret = parse_ptp_message_announce (msg, &reader);
break;
default:
/* ignore for now */
break;
}
return ret;
}
static gint
compare_announce_message (const PtpAnnounceMessage * a,
const PtpAnnounceMessage * b)
{
/* IEEE 1588 Figure 27 */
if (a->grandmaster_identity == b->grandmaster_identity) {
if (a->steps_removed + 1 < b->steps_removed)
return -1;
else if (a->steps_removed > b->steps_removed + 1)
return 1;
/* Error cases are filtered out earlier */
if (a->steps_removed < b->steps_removed)
return -1;
else if (a->steps_removed > b->steps_removed)
return 1;
/* Error cases are filtered out earlier */
if (a->master_clock_identity.clock_identity <
b->master_clock_identity.clock_identity)
return -1;
else if (a->master_clock_identity.clock_identity >
b->master_clock_identity.clock_identity)
return 1;
/* Error cases are filtered out earlier */
if (a->master_clock_identity.port_number <
b->master_clock_identity.port_number)
return -1;
else if (a->master_clock_identity.port_number >
b->master_clock_identity.port_number)
return 1;
else
g_assert_not_reached ();
return 0;
}
if (a->grandmaster_priority_1 < b->grandmaster_priority_1)
return -1;
else if (a->grandmaster_priority_1 > b->grandmaster_priority_1)
return 1;
if (a->grandmaster_clock_quality.clock_class <
b->grandmaster_clock_quality.clock_class)
return -1;
else if (a->grandmaster_clock_quality.clock_class >
b->grandmaster_clock_quality.clock_class)
return 1;
if (a->grandmaster_clock_quality.clock_accuracy <
b->grandmaster_clock_quality.clock_accuracy)
return -1;
else if (a->grandmaster_clock_quality.clock_accuracy >
b->grandmaster_clock_quality.clock_accuracy)
return 1;
if (a->grandmaster_clock_quality.offset_scaled_log_variance <
b->grandmaster_clock_quality.offset_scaled_log_variance)
return -1;
else if (a->grandmaster_clock_quality.offset_scaled_log_variance >
b->grandmaster_clock_quality.offset_scaled_log_variance)
return 1;
if (a->grandmaster_priority_2 < b->grandmaster_priority_2)
return -1;
else if (a->grandmaster_priority_2 > b->grandmaster_priority_2)
return 1;
if (a->grandmaster_identity < b->grandmaster_identity)
return -1;
else if (a->grandmaster_identity > b->grandmaster_identity)
return 1;
else
g_assert_not_reached ();
return 0;
}
static void
select_best_master_clock (PtpDomainData * domain, GstClockTime now)
{
GList *qualified_messages = NULL;
GList *l, *m;
PtpAnnounceMessage *best = NULL;
/* IEEE 1588 9.3.2.5 */
for (l = domain->announce_senders; l; l = l->next) {
PtpAnnounceSender *sender = l->data;
GstClockTime window = 4 * sender->announce_interval;
gint count = 0;
for (m = sender->announce_messages.head; m; m = m->next) {
PtpAnnounceMessage *msg = m->data;
if (now - msg->receive_time <= window)
count++;
}
/* Only include the newest message of announce senders that had at least 2
* announce messages in the last 4 announce intervals. Which also means
* that we wait at least 4 announce intervals before we select a master
* clock. Until then we just report based on the newest SYNC we received
*/
if (count >= 2) {
qualified_messages =
g_list_prepend (qualified_messages,
g_queue_peek_tail (&sender->announce_messages));
}
}
if (!qualified_messages) {
GST_DEBUG
("No qualified announce messages for domain %u, can't select a master clock",
domain->domain);
domain->have_master_clock = FALSE;
return;
}
for (l = qualified_messages; l; l = l->next) {
PtpAnnounceMessage *msg = l->data;
if (!best || compare_announce_message (msg, best) < 0)
best = msg;
}
if (domain->have_master_clock
&& compare_clock_identity (&domain->master_clock_identity,
&best->master_clock_identity) == 0) {
GST_DEBUG ("Master clock in domain %u did not change", domain->domain);
} else {
GST_DEBUG ("Selected master clock for domain %u: 0x%016" G_GINT64_MODIFIER
"x %u with grandmaster clock 0x%016" G_GINT64_MODIFIER "x",
domain->domain, best->master_clock_identity.clock_identity,
best->master_clock_identity.port_number, best->grandmaster_identity);
domain->have_master_clock = TRUE;
domain->grandmaster_identity = best->grandmaster_identity;
/* Opportunistic master clock selection likely gave us the same master
* clock before, no need to reset all statistics */
if (compare_clock_identity (&domain->master_clock_identity,
&best->master_clock_identity) != 0) {
memcpy (&domain->master_clock_identity, &best->master_clock_identity,
sizeof (PtpClockIdentity));
domain->mean_path_delay = 0;
domain->last_delay_req = 0;
domain->last_path_delays_missing = 9;
domain->min_delay_req_interval = 0;
domain->sync_interval = 0;
domain->last_ptp_sync_time = 0;
domain->skipped_updates = 0;
g_queue_foreach (&domain->pending_syncs, (GFunc) ptp_pending_sync_free,
NULL);
g_queue_clear (&domain->pending_syncs);
}
if (g_atomic_int_get (&domain_stats_n_hooks)) {
GstStructure *stats =
gst_structure_new (GST_PTP_STATISTICS_BEST_MASTER_CLOCK_SELECTED,
"domain", G_TYPE_UINT, domain->domain,
"master-clock-id", G_TYPE_UINT64,
domain->master_clock_identity.clock_identity,
"master-clock-port", G_TYPE_UINT,
domain->master_clock_identity.port_number,
"grandmaster-clock-id", G_TYPE_UINT64, domain->grandmaster_identity,
NULL);
emit_ptp_statistics (domain->domain, stats);
gst_structure_free (stats);
}
}
}
static void
handle_announce_message (PtpMessage * msg, GstClockTime receive_time)
{
GList *l;
PtpDomainData *domain = NULL;
PtpAnnounceSender *sender = NULL;
PtpAnnounceMessage *announce;
/* IEEE1588 9.3.2.2 e)
* Don't consider messages with the alternate master flag set
*/
if ((msg->flag_field & 0x0100))
return;
/* IEEE 1588 9.3.2.5 d)
* Don't consider announce messages with steps_removed>=255
*/
if (msg->message_specific.announce.steps_removed >= 255)
return;
for (l = domain_data; l; l = l->next) {
PtpDomainData *tmp = l->data;
if (tmp->domain == msg->domain_number) {
domain = tmp;
break;
}
}
if (!domain) {
gchar *clock_name;
domain = g_new0 (PtpDomainData, 1);
domain->domain = msg->domain_number;
clock_name = g_strdup_printf ("ptp-clock-%u", domain->domain);
domain->domain_clock =
g_object_new (GST_TYPE_SYSTEM_CLOCK, "name", clock_name, NULL);
gst_object_ref_sink (domain->domain_clock);
g_free (clock_name);
g_queue_init (&domain->pending_syncs);
domain->last_path_delays_missing = 9;
domain_data = g_list_prepend (domain_data, domain);
g_mutex_lock (&domain_clocks_lock);
domain_clocks = g_list_prepend (domain_clocks, domain);
g_mutex_unlock (&domain_clocks_lock);
if (g_atomic_int_get (&domain_stats_n_hooks)) {
GstStructure *stats =
gst_structure_new (GST_PTP_STATISTICS_NEW_DOMAIN_FOUND, "domain",
G_TYPE_UINT, domain->domain, "clock", GST_TYPE_CLOCK,
domain->domain_clock, NULL);
emit_ptp_statistics (domain->domain, stats);
gst_structure_free (stats);
}
}
for (l = domain->announce_senders; l; l = l->next) {
PtpAnnounceSender *tmp = l->data;
if (compare_clock_identity (&tmp->master_clock_identity,
&msg->source_port_identity) == 0) {
sender = tmp;
break;
}
}
if (!sender) {
sender = g_new0 (PtpAnnounceSender, 1);
memcpy (&sender->master_clock_identity, &msg->source_port_identity,
sizeof (PtpClockIdentity));
g_queue_init (&sender->announce_messages);
domain->announce_senders =
g_list_prepend (domain->announce_senders, sender);
}
for (l = sender->announce_messages.head; l; l = l->next) {
PtpAnnounceMessage *tmp = l->data;
/* IEEE 1588 9.3.2.5 c)
* Don't consider identical messages, i.e. duplicates
*/
if (tmp->sequence_id == msg->sequence_id)
return;
}
sender->announce_interval = log2_to_clock_time (msg->log_message_interval);
announce = g_new0 (PtpAnnounceMessage, 1);
announce->receive_time = receive_time;
announce->sequence_id = msg->sequence_id;
memcpy (&announce->master_clock_identity, &msg->source_port_identity,
sizeof (PtpClockIdentity));
announce->grandmaster_identity =
msg->message_specific.announce.grandmaster_identity;
announce->grandmaster_priority_1 =
msg->message_specific.announce.grandmaster_priority_1;
announce->grandmaster_clock_quality.clock_class =
msg->message_specific.announce.grandmaster_clock_quality.clock_class;
announce->grandmaster_clock_quality.clock_accuracy =
msg->message_specific.announce.grandmaster_clock_quality.clock_accuracy;
announce->grandmaster_clock_quality.offset_scaled_log_variance =
msg->message_specific.announce.
grandmaster_clock_quality.offset_scaled_log_variance;
announce->grandmaster_priority_2 =
msg->message_specific.announce.grandmaster_priority_2;
announce->steps_removed = msg->message_specific.announce.steps_removed;
announce->time_source = msg->message_specific.announce.time_source;
g_queue_push_tail (&sender->announce_messages, announce);
select_best_master_clock (domain, receive_time);
}
static gboolean
send_delay_req_timeout (PtpPendingSync * sync)
{
StdIOHeader header = { 0, };
guint8 delay_req[44];
GstByteWriter writer;
GIOStatus status;
gsize written;
GError *err = NULL;
header.type = TYPE_EVENT;
header.size = 44;
gst_byte_writer_init_with_data (&writer, delay_req, 44, FALSE);
gst_byte_writer_put_uint8_unchecked (&writer, PTP_MESSAGE_TYPE_DELAY_REQ);
gst_byte_writer_put_uint8_unchecked (&writer, 2);
gst_byte_writer_put_uint16_be_unchecked (&writer, 44);
gst_byte_writer_put_uint8_unchecked (&writer, sync->domain);
gst_byte_writer_put_uint8_unchecked (&writer, 0);
gst_byte_writer_put_uint16_be_unchecked (&writer, 0);
gst_byte_writer_put_uint64_be_unchecked (&writer, 0);
gst_byte_writer_put_uint32_be_unchecked (&writer, 0);
gst_byte_writer_put_uint64_be_unchecked (&writer,
ptp_clock_id.clock_identity);
gst_byte_writer_put_uint16_be_unchecked (&writer, ptp_clock_id.port_number);
gst_byte_writer_put_uint16_be_unchecked (&writer, sync->delay_req_seqnum);
gst_byte_writer_put_uint8_unchecked (&writer, 0x01);
gst_byte_writer_put_uint8_unchecked (&writer, 0x7f);
gst_byte_writer_put_uint64_be_unchecked (&writer, 0);
gst_byte_writer_put_uint16_be_unchecked (&writer, 0);
status =
g_io_channel_write_chars (stdout_channel, (gchar *) & header,
sizeof (header), &written, &err);
if (status == G_IO_STATUS_ERROR) {
g_warning ("Failed to write to stdout: %s", err->message);
g_clear_error (&err);
return G_SOURCE_REMOVE;
} else if (status == G_IO_STATUS_EOF) {
g_message ("EOF on stdout");
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
} else if (status != G_IO_STATUS_NORMAL) {
g_warning ("Unexpected stdout write status: %d", status);
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
} else if (written != sizeof (header)) {
g_warning ("Unexpected write size: %" G_GSIZE_FORMAT, written);
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
}
sync->delay_req_send_time_local =
gst_clock_get_time (observation_system_clock);
status =
g_io_channel_write_chars (stdout_channel,
(const gchar *) delay_req, 44, &written, &err);
if (status == G_IO_STATUS_ERROR) {
g_warning ("Failed to write to stdout: %s", err->message);
g_clear_error (&err);
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
} else if (status == G_IO_STATUS_EOF) {
g_message ("EOF on stdout");
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
} else if (status != G_IO_STATUS_NORMAL) {
g_warning ("Unexpected stdout write status: %d", status);
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
} else if (written != 44) {
g_warning ("Unexpected write size: %" G_GSIZE_FORMAT, written);
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
}
return G_SOURCE_REMOVE;
}
static gboolean
send_delay_req (PtpDomainData * domain, PtpPendingSync * sync)
{
GstClockTime now = gst_clock_get_time (observation_system_clock);
guint timeout;
GSource *timeout_source;
if (domain->last_delay_req != 0
&& domain->last_delay_req + domain->min_delay_req_interval > now)
return FALSE;
domain->last_delay_req = now;
sync->delay_req_seqnum = domain->last_delay_req_seqnum++;
/* IEEE 1588 9.5.11.2 */
if (domain->last_delay_req == 0 || domain->min_delay_req_interval == 0)
timeout = 0;
else
timeout =
g_rand_int_range (delay_req_rand, 0,
(domain->min_delay_req_interval * 2) / GST_MSECOND);
sync->timeout_source = timeout_source = g_timeout_source_new (timeout);
g_source_set_priority (timeout_source, G_PRIORITY_DEFAULT);
g_source_set_callback (timeout_source, (GSourceFunc) send_delay_req_timeout,
sync, NULL);
g_source_attach (timeout_source, main_context);
return TRUE;
}
/* Filtering of outliers for RTT and time calculations inspired
* by the code from gstnetclientclock.c
*/
static void
update_ptp_time (PtpDomainData * domain, PtpPendingSync * sync)
{
GstClockTime internal_time, external_time, rate_num, rate_den;
GstClockTime corrected_ptp_time, corrected_local_time;
gdouble r_squared = 0.0;
gboolean synced;
GstClockTimeDiff discont = 0;
GstClockTime estimated_ptp_time = GST_CLOCK_TIME_NONE;
#ifdef USE_MEASUREMENT_FILTERING
GstClockTime orig_internal_time, orig_external_time, orig_rate_num,
orig_rate_den;
GstClockTime new_estimated_ptp_time;
GstClockTime max_discont, estimated_ptp_time_min, estimated_ptp_time_max;
gboolean now_synced;
#endif
#ifdef USE_ONLY_SYNC_WITH_DELAY
GstClockTime mean_path_delay;
if (sync->delay_req_send_time_local == GST_CLOCK_TIME_NONE)
return;
/* IEEE 1588 11.3 */
mean_path_delay =
(sync->delay_req_recv_time_remote - sync->sync_send_time_remote +
sync->sync_recv_time_local - sync->delay_req_send_time_local -
(sync->correction_field_sync + sync->correction_field_delay +
32768) / 65536) / 2;
#endif
/* IEEE 1588 11.2 */
corrected_ptp_time =
sync->sync_send_time_remote +
(sync->correction_field_sync + 32768) / 65536;
#ifdef USE_ONLY_SYNC_WITH_DELAY
corrected_local_time = sync->sync_recv_time_local - mean_path_delay;
#else
corrected_local_time = sync->sync_recv_time_local - domain->mean_path_delay;
#endif
#ifdef USE_MEASUREMENT_FILTERING
/* We check this here and when updating the mean path delay, because
* we can get here without a delay response too */
if (sync->follow_up_recv_time_local != GST_CLOCK_TIME_NONE
&& sync->follow_up_recv_time_local >
sync->sync_recv_time_local + 2 * domain->mean_path_delay) {
GST_WARNING ("Sync-follow-up delay for domain %u too big: %" GST_TIME_FORMAT
" > 2 * %" GST_TIME_FORMAT, domain->domain,
GST_TIME_ARGS (sync->follow_up_recv_time_local),
GST_TIME_ARGS (domain->mean_path_delay));
synced = FALSE;
gst_clock_get_calibration (GST_CLOCK_CAST (domain->domain_clock),
&internal_time, &external_time, &rate_num, &rate_den);
goto out;
}
#endif
/* Set an initial local-remote relation */
if (domain->last_ptp_time == 0)
gst_clock_set_calibration (domain->domain_clock, corrected_local_time,
corrected_ptp_time, 1, 1);
#ifdef USE_MEASUREMENT_FILTERING
/* Check if the corrected PTP time is +/- 3/4 RTT around what we would
* estimate with our present knowledge about the clock
*/
/* Store what the clock produced as 'now' before this update */
gst_clock_get_calibration (GST_CLOCK_CAST (domain->domain_clock),
&orig_internal_time, &orig_external_time, &orig_rate_num, &orig_rate_den);
internal_time = orig_internal_time;
external_time = orig_external_time;
rate_num = orig_rate_num;
rate_den = orig_rate_den;
/* 3/4 RTT window around the estimation */
max_discont = domain->mean_path_delay * 3 / 2;
/* Check if the estimated sync time is inside our window */
estimated_ptp_time_min = corrected_local_time - max_discont;
estimated_ptp_time_min =
gst_clock_adjust_with_calibration (GST_CLOCK_CAST (domain->domain_clock),
estimated_ptp_time_min, internal_time, external_time, rate_num, rate_den);
estimated_ptp_time_max = corrected_local_time + max_discont;
estimated_ptp_time_max =
gst_clock_adjust_with_calibration (GST_CLOCK_CAST (domain->domain_clock),
estimated_ptp_time_max, internal_time, external_time, rate_num, rate_den);
synced = (estimated_ptp_time_min < corrected_ptp_time
&& corrected_ptp_time < estimated_ptp_time_max);
GST_DEBUG ("Adding observation for domain %u: %" GST_TIME_FORMAT " - %"
GST_TIME_FORMAT, domain->domain,
GST_TIME_ARGS (corrected_ptp_time), GST_TIME_ARGS (corrected_local_time));
GST_DEBUG ("Synced %d: %" GST_TIME_FORMAT " < %" GST_TIME_FORMAT " < %"
GST_TIME_FORMAT, synced, GST_TIME_ARGS (estimated_ptp_time_min),
GST_TIME_ARGS (corrected_ptp_time),
GST_TIME_ARGS (estimated_ptp_time_max));
if (gst_clock_add_observation_unapplied (domain->domain_clock,
corrected_local_time, corrected_ptp_time, &r_squared,
&internal_time, &external_time, &rate_num, &rate_den)) {
GST_DEBUG ("Regression gave r_squared: %f", r_squared);
/* Old estimated PTP time based on receive time and path delay */
estimated_ptp_time = corrected_local_time;
estimated_ptp_time =
gst_clock_adjust_with_calibration (GST_CLOCK_CAST
(domain->domain_clock), estimated_ptp_time, orig_internal_time,
orig_external_time, orig_rate_num, orig_rate_den);
/* New estimated PTP time based on receive time and path delay */
new_estimated_ptp_time = corrected_local_time;
new_estimated_ptp_time =
gst_clock_adjust_with_calibration (GST_CLOCK_CAST
(domain->domain_clock), new_estimated_ptp_time, internal_time,
external_time, rate_num, rate_den);
discont = GST_CLOCK_DIFF (estimated_ptp_time, new_estimated_ptp_time);
if (synced && ABS (discont) > max_discont) {
GstClockTimeDiff offset;
GST_DEBUG ("Too large a discont %s%" GST_TIME_FORMAT
", clamping to 1/4 average RTT = %" GST_TIME_FORMAT,
(discont < 0 ? "-" : ""), GST_TIME_ARGS (ABS (discont)),
GST_TIME_ARGS (max_discont));
if (discont > 0) { /* Too large a forward step - add a -ve offset */
offset = max_discont - discont;
if (-offset > external_time)
external_time = 0;
else
external_time += offset;
} else { /* Too large a backward step - add a +ve offset */
offset = -(max_discont + discont);
external_time += offset;
}
discont += offset;
} else {
GST_DEBUG ("Discont %s%" GST_TIME_FORMAT " (max: %" GST_TIME_FORMAT ")",
(discont < 0 ? "-" : ""), GST_TIME_ARGS (ABS (discont)),
GST_TIME_ARGS (max_discont));
}
/* Check if the estimated sync time is now (still) inside our window */
estimated_ptp_time_min = corrected_local_time - max_discont;
estimated_ptp_time_min =
gst_clock_adjust_with_calibration (GST_CLOCK_CAST
(domain->domain_clock), estimated_ptp_time_min, internal_time,
external_time, rate_num, rate_den);
estimated_ptp_time_max = corrected_local_time + max_discont;
estimated_ptp_time_max =
gst_clock_adjust_with_calibration (GST_CLOCK_CAST
(domain->domain_clock), estimated_ptp_time_max, internal_time,
external_time, rate_num, rate_den);
now_synced = (estimated_ptp_time_min < corrected_ptp_time
&& corrected_ptp_time < estimated_ptp_time_max);
GST_DEBUG ("Now synced %d: %" GST_TIME_FORMAT " < %" GST_TIME_FORMAT " < %"
GST_TIME_FORMAT, now_synced, GST_TIME_ARGS (estimated_ptp_time_min),
GST_TIME_ARGS (corrected_ptp_time),
GST_TIME_ARGS (estimated_ptp_time_max));
if (synced || now_synced || domain->skipped_updates > MAX_SKIPPED_UPDATES) {
gst_clock_set_calibration (GST_CLOCK_CAST (domain->domain_clock),
internal_time, external_time, rate_num, rate_den);
domain->skipped_updates = 0;
domain->last_ptp_time = corrected_ptp_time;
domain->last_local_time = corrected_local_time;
} else {
domain->skipped_updates++;
}
} else {
domain->last_ptp_time = corrected_ptp_time;
domain->last_local_time = corrected_local_time;
}
#else
GST_DEBUG ("Adding observation for domain %u: %" GST_TIME_FORMAT " - %"
GST_TIME_FORMAT, domain->domain,
GST_TIME_ARGS (corrected_ptp_time), GST_TIME_ARGS (corrected_local_time));
gst_clock_get_calibration (GST_CLOCK_CAST (domain->domain_clock),
&internal_time, &external_time, &rate_num, &rate_den);
estimated_ptp_time = corrected_local_time;
estimated_ptp_time =
gst_clock_adjust_with_calibration (GST_CLOCK_CAST
(domain->domain_clock), estimated_ptp_time, internal_time,
external_time, rate_num, rate_den);
gst_clock_add_observation (domain->domain_clock,
corrected_local_time, corrected_ptp_time, &r_squared);
gst_clock_get_calibration (GST_CLOCK_CAST (domain->domain_clock),
&internal_time, &external_time, &rate_num, &rate_den);
synced = TRUE;
domain->last_ptp_time = corrected_ptp_time;
domain->last_local_time = corrected_local_time;
#endif
#ifdef USE_MEASUREMENT_FILTERING
out:
#endif
if (g_atomic_int_get (&domain_stats_n_hooks)) {
GstStructure *stats = gst_structure_new (GST_PTP_STATISTICS_TIME_UPDATED,
"domain", G_TYPE_UINT, domain->domain,
"mean-path-delay-avg", GST_TYPE_CLOCK_TIME, domain->mean_path_delay,
"local-time", GST_TYPE_CLOCK_TIME, corrected_local_time,
"ptp-time", GST_TYPE_CLOCK_TIME, corrected_ptp_time,
"estimated-ptp-time", GST_TYPE_CLOCK_TIME, estimated_ptp_time,
"discontinuity", G_TYPE_INT64, discont,
"synced", G_TYPE_BOOLEAN, synced,
"r-squared", G_TYPE_DOUBLE, r_squared,
"internal-time", GST_TYPE_CLOCK_TIME, internal_time,
"external-time", GST_TYPE_CLOCK_TIME, external_time,
"rate-num", G_TYPE_UINT64, rate_num,
"rate-den", G_TYPE_UINT64, rate_den,
"rate", G_TYPE_DOUBLE, (gdouble) (rate_num) / rate_den,
NULL);
emit_ptp_statistics (domain->domain, stats);
gst_structure_free (stats);
}
}
#ifdef USE_MEDIAN_PRE_FILTERING
static gint
compare_clock_time (const GstClockTime * a, const GstClockTime * b)
{
if (*a < *b)
return -1;
else if (*a > *b)
return 1;
return 0;
}
#endif
static gboolean
update_mean_path_delay (PtpDomainData * domain, PtpPendingSync * sync)
{
#ifdef USE_MEDIAN_PRE_FILTERING
GstClockTime last_path_delays[MEDIAN_PRE_FILTERING_WINDOW];
GstClockTime median;
gint i;
#endif
GstClockTime mean_path_delay, delay_req_delay = 0;
gboolean ret;
/* IEEE 1588 11.3 */
mean_path_delay =
(sync->delay_req_recv_time_remote - sync->sync_send_time_remote +
sync->sync_recv_time_local - sync->delay_req_send_time_local -
(sync->correction_field_sync + sync->correction_field_delay +
32768) / 65536) / 2;
#ifdef USE_MEDIAN_PRE_FILTERING
for (i = 1; i < MEDIAN_PRE_FILTERING_WINDOW; i++)
domain->last_path_delays[i - 1] = domain->last_path_delays[i];
domain->last_path_delays[i - 1] = mean_path_delay;
if (domain->last_path_delays_missing) {
domain->last_path_delays_missing--;
} else {
memcpy (&last_path_delays, &domain->last_path_delays,
sizeof (last_path_delays));
g_qsort_with_data (&last_path_delays,
MEDIAN_PRE_FILTERING_WINDOW, sizeof (GstClockTime),
(GCompareDataFunc) compare_clock_time, NULL);
median = last_path_delays[MEDIAN_PRE_FILTERING_WINDOW / 2];
/* FIXME: We might want to use something else here, like only allowing
* things in the interquartile range, or also filtering away delays that
* are too small compared to the median. This here worked well enough
* in tests so far.
*/
if (mean_path_delay > 2 * median) {
GST_WARNING ("Path delay for domain %u too big compared to median: %"
GST_TIME_FORMAT " > 2 * %" GST_TIME_FORMAT, domain->domain,
GST_TIME_ARGS (mean_path_delay), GST_TIME_ARGS (median));
ret = FALSE;
goto out;
}
}
#endif
#ifdef USE_RUNNING_AVERAGE_DELAY
/* Track an average round trip time, for a bit of smoothing */
/* Always update before discarding a sample, so genuine changes in
* the network get picked up, eventually */
if (domain->mean_path_delay == 0)
domain->mean_path_delay = mean_path_delay;
else if (mean_path_delay < domain->mean_path_delay) /* Shorter RTTs carry more weight than longer */
domain->mean_path_delay =
(3 * domain->mean_path_delay + mean_path_delay) / 4;
else
domain->mean_path_delay =
(15 * domain->mean_path_delay + mean_path_delay) / 16;
#else
domain->mean_path_delay = mean_path_delay;
#endif
#ifdef USE_MEASUREMENT_FILTERING
if (sync->follow_up_recv_time_local != GST_CLOCK_TIME_NONE &&
domain->mean_path_delay != 0
&& sync->follow_up_recv_time_local >
sync->sync_recv_time_local + 2 * domain->mean_path_delay) {
GST_WARNING ("Sync-follow-up delay for domain %u too big: %" GST_TIME_FORMAT
" > 2 * %" GST_TIME_FORMAT, domain->domain,
GST_TIME_ARGS (sync->follow_up_recv_time_local -
sync->sync_recv_time_local),
GST_TIME_ARGS (domain->mean_path_delay));
ret = FALSE;
goto out;
}
if (mean_path_delay > 2 * domain->mean_path_delay) {
GST_WARNING ("Mean path delay for domain %u too big: %" GST_TIME_FORMAT
" > 2 * %" GST_TIME_FORMAT, domain->domain,
GST_TIME_ARGS (mean_path_delay),
GST_TIME_ARGS (domain->mean_path_delay));
ret = FALSE;
goto out;
}
#endif
delay_req_delay =
sync->delay_resp_recv_time_local - sync->delay_req_send_time_local;
#ifdef USE_MEASUREMENT_FILTERING
/* delay_req_delay is a RTT, so 2 times the path delay */
if (delay_req_delay > 4 * domain->mean_path_delay) {
GST_WARNING ("Delay-request-response delay for domain %u too big: %"
GST_TIME_FORMAT " > 4 * %" GST_TIME_FORMAT, domain->domain,
GST_TIME_ARGS (delay_req_delay),
GST_TIME_ARGS (domain->mean_path_delay));
ret = FALSE;
goto out;
}
#endif
ret = TRUE;
GST_DEBUG ("Got mean path delay for domain %u: %" GST_TIME_FORMAT " (new: %"
GST_TIME_FORMAT ")", domain->domain,
GST_TIME_ARGS (domain->mean_path_delay), GST_TIME_ARGS (mean_path_delay));
GST_DEBUG ("Delay request delay for domain %u: %" GST_TIME_FORMAT,
domain->domain, GST_TIME_ARGS (delay_req_delay));
#if defined(USE_MEASUREMENT_FILTERING) || defined(USE_MEDIAN_PRE_FILTERING)
out:
#endif
if (g_atomic_int_get (&domain_stats_n_hooks)) {
GstStructure *stats =
gst_structure_new (GST_PTP_STATISTICS_PATH_DELAY_MEASURED,
"domain", G_TYPE_UINT, domain->domain,
"mean-path-delay-avg", GST_TYPE_CLOCK_TIME, domain->mean_path_delay,
"mean-path-delay", GST_TYPE_CLOCK_TIME, mean_path_delay,
"delay-request-delay", GST_TYPE_CLOCK_TIME, delay_req_delay, NULL);
emit_ptp_statistics (domain->domain, stats);
gst_structure_free (stats);
}
return ret;
}
static void
handle_sync_message (PtpMessage * msg, GstClockTime receive_time)
{
GList *l;
PtpDomainData *domain = NULL;
PtpPendingSync *sync = NULL;
/* Don't consider messages with the alternate master flag set */
if ((msg->flag_field & 0x0100))
return;
for (l = domain_data; l; l = l->next) {
PtpDomainData *tmp = l->data;
if (msg->domain_number == tmp->domain) {
domain = tmp;
break;
}
}
if (!domain) {
gchar *clock_name;
domain = g_new0 (PtpDomainData, 1);
domain->domain = msg->domain_number;
clock_name = g_strdup_printf ("ptp-clock-%u", domain->domain);
domain->domain_clock =
g_object_new (GST_TYPE_SYSTEM_CLOCK, "name", clock_name, NULL);
gst_object_ref_sink (domain->domain_clock);
g_free (clock_name);
g_queue_init (&domain->pending_syncs);
domain->last_path_delays_missing = 9;
domain_data = g_list_prepend (domain_data, domain);
g_mutex_lock (&domain_clocks_lock);
domain_clocks = g_list_prepend (domain_clocks, domain);
g_mutex_unlock (&domain_clocks_lock);
}
/* If we have a master clock, ignore this message if it's not coming from there */
if (domain->have_master_clock
&& compare_clock_identity (&domain->master_clock_identity,
&msg->source_port_identity) != 0)
return;
#ifdef USE_OPPORTUNISTIC_CLOCK_SELECTION
/* Opportunistic selection of master clock */
if (!domain->have_master_clock)
memcpy (&domain->master_clock_identity, &msg->source_port_identity,
sizeof (PtpClockIdentity));
#else
if (!domain->have_master_clock)
return;
#endif
domain->sync_interval = log2_to_clock_time (msg->log_message_interval);
/* Check if duplicated */
for (l = domain->pending_syncs.head; l; l = l->next) {
PtpPendingSync *tmp = l->data;
if (tmp->sync_seqnum == msg->sequence_id)
return;
}
if (msg->message_specific.sync.origin_timestamp.seconds_field >
GST_CLOCK_TIME_NONE / GST_SECOND) {
GST_FIXME ("Unsupported sync message seconds field value: %"
G_GUINT64_FORMAT " > %" G_GUINT64_FORMAT,
msg->message_specific.sync.origin_timestamp.seconds_field,
GST_CLOCK_TIME_NONE / GST_SECOND);
return;
}
sync = g_new0 (PtpPendingSync, 1);
sync->domain = domain->domain;
sync->sync_seqnum = msg->sequence_id;
sync->sync_recv_time_local = receive_time;
sync->sync_send_time_remote = GST_CLOCK_TIME_NONE;
sync->follow_up_recv_time_local = GST_CLOCK_TIME_NONE;
sync->delay_req_send_time_local = GST_CLOCK_TIME_NONE;
sync->delay_req_recv_time_remote = GST_CLOCK_TIME_NONE;
sync->delay_resp_recv_time_local = GST_CLOCK_TIME_NONE;
/* 0.5 correction factor for division later */
sync->correction_field_sync = msg->correction_field;
if ((msg->flag_field & 0x0200)) {
/* Wait for FOLLOW_UP */
} else {
sync->sync_send_time_remote =
PTP_TIMESTAMP_TO_GST_CLOCK_TIME (msg->message_specific.
sync.origin_timestamp);
if (domain->last_ptp_sync_time != 0
&& domain->last_ptp_sync_time >= sync->sync_send_time_remote) {
GST_WARNING ("Backwards PTP times in domain %u: %" GST_TIME_FORMAT " >= %"
GST_TIME_FORMAT, domain->domain,
GST_TIME_ARGS (domain->last_ptp_sync_time),
GST_TIME_ARGS (sync->sync_send_time_remote));
ptp_pending_sync_free (sync);
sync = NULL;
return;
}
domain->last_ptp_sync_time = sync->sync_send_time_remote;
if (send_delay_req (domain, sync)) {
/* Sent delay request */
} else {
update_ptp_time (domain, sync);
ptp_pending_sync_free (sync);
sync = NULL;
}
}
if (sync)
g_queue_push_tail (&domain->pending_syncs, sync);
}
static void
handle_follow_up_message (PtpMessage * msg, GstClockTime receive_time)
{
GList *l;
PtpDomainData *domain = NULL;
PtpPendingSync *sync = NULL;
/* Don't consider messages with the alternate master flag set */
if ((msg->flag_field & 0x0100))
return;
for (l = domain_data; l; l = l->next) {
PtpDomainData *tmp = l->data;
if (msg->domain_number == tmp->domain) {
domain = tmp;
break;
}
}
if (!domain)
return;
/* If we have a master clock, ignore this message if it's not coming from there */
if (domain->have_master_clock
&& compare_clock_identity (&domain->master_clock_identity,
&msg->source_port_identity) != 0)
return;
/* Check if we know about this one */
for (l = domain->pending_syncs.head; l; l = l->next) {
PtpPendingSync *tmp = l->data;
if (tmp->sync_seqnum == msg->sequence_id) {
sync = tmp;
break;
}
}
if (!sync)
return;
/* Got a FOLLOW_UP for this already */
if (sync->sync_send_time_remote != GST_CLOCK_TIME_NONE)
return;
if (sync->sync_recv_time_local >= receive_time) {
GST_ERROR ("Got bogus follow up in domain %u: %" GST_TIME_FORMAT " > %"
GST_TIME_FORMAT, domain->domain,
GST_TIME_ARGS (sync->sync_recv_time_local),
GST_TIME_ARGS (receive_time));
g_queue_remove (&domain->pending_syncs, sync);
ptp_pending_sync_free (sync);
return;
}
sync->correction_field_sync += msg->correction_field;
sync->sync_send_time_remote =
PTP_TIMESTAMP_TO_GST_CLOCK_TIME (msg->message_specific.
follow_up.precise_origin_timestamp);
sync->follow_up_recv_time_local = receive_time;
if (domain->last_ptp_sync_time >= sync->sync_send_time_remote) {
GST_WARNING ("Backwards PTP times in domain %u: %" GST_TIME_FORMAT " >= %"
GST_TIME_FORMAT, domain->domain,
GST_TIME_ARGS (domain->last_ptp_sync_time),
GST_TIME_ARGS (sync->sync_send_time_remote));
g_queue_remove (&domain->pending_syncs, sync);
ptp_pending_sync_free (sync);
sync = NULL;
return;
}
domain->last_ptp_sync_time = sync->sync_send_time_remote;
if (send_delay_req (domain, sync)) {
/* Sent delay request */
} else {
update_ptp_time (domain, sync);
g_queue_remove (&domain->pending_syncs, sync);
ptp_pending_sync_free (sync);
sync = NULL;
}
}
static void
handle_delay_resp_message (PtpMessage * msg, GstClockTime receive_time)
{
GList *l;
PtpDomainData *domain = NULL;
PtpPendingSync *sync = NULL;
/* Don't consider messages with the alternate master flag set */
if ((msg->flag_field & 0x0100))
return;
for (l = domain_data; l; l = l->next) {
PtpDomainData *tmp = l->data;
if (msg->domain_number == tmp->domain) {
domain = tmp;
break;
}
}
if (!domain)
return;
/* If we have a master clock, ignore this message if it's not coming from there */
if (domain->have_master_clock
&& compare_clock_identity (&domain->master_clock_identity,
&msg->source_port_identity) != 0)
return;
/* Not for us */
if (msg->message_specific.delay_resp.
requesting_port_identity.clock_identity != ptp_clock_id.clock_identity
|| msg->message_specific.delay_resp.
requesting_port_identity.port_number != ptp_clock_id.port_number)
return;
domain->min_delay_req_interval =
log2_to_clock_time (msg->log_message_interval);
/* Check if we know about this one */
for (l = domain->pending_syncs.head; l; l = l->next) {
PtpPendingSync *tmp = l->data;
if (tmp->delay_req_seqnum == msg->sequence_id) {
sync = tmp;
break;
}
}
if (!sync)
return;
/* Got a DELAY_RESP for this already */
if (sync->delay_req_recv_time_remote != GST_CLOCK_TIME_NONE)
return;
if (sync->delay_req_send_time_local > receive_time) {
GST_ERROR ("Got bogus delay response in domain %u: %" GST_TIME_FORMAT " > %"
GST_TIME_FORMAT, domain->domain,
GST_TIME_ARGS (sync->delay_req_send_time_local),
GST_TIME_ARGS (receive_time));
g_queue_remove (&domain->pending_syncs, sync);
ptp_pending_sync_free (sync);
return;
}
sync->correction_field_delay = msg->correction_field;
sync->delay_req_recv_time_remote =
PTP_TIMESTAMP_TO_GST_CLOCK_TIME (msg->message_specific.
delay_resp.receive_timestamp);
sync->delay_resp_recv_time_local = receive_time;
if (domain->mean_path_delay != 0
&& sync->sync_send_time_remote > sync->delay_req_recv_time_remote) {
GST_WARNING ("Sync send time after delay req receive time for domain %u: %"
GST_TIME_FORMAT " > %" GST_TIME_FORMAT, domain->domain,
GST_TIME_ARGS (sync->sync_send_time_remote),
GST_TIME_ARGS (sync->delay_req_recv_time_remote));
g_queue_remove (&domain->pending_syncs, sync);
ptp_pending_sync_free (sync);
return;
}
if (update_mean_path_delay (domain, sync))
update_ptp_time (domain, sync);
g_queue_remove (&domain->pending_syncs, sync);
ptp_pending_sync_free (sync);
}
static void
handle_ptp_message (PtpMessage * msg, GstClockTime receive_time)
{
/* Ignore our own messages */
if (msg->source_port_identity.clock_identity == ptp_clock_id.clock_identity &&
msg->source_port_identity.port_number == ptp_clock_id.port_number)
return;
switch (msg->message_type) {
case PTP_MESSAGE_TYPE_ANNOUNCE:
handle_announce_message (msg, receive_time);
break;
case PTP_MESSAGE_TYPE_SYNC:
handle_sync_message (msg, receive_time);
break;
case PTP_MESSAGE_TYPE_FOLLOW_UP:
handle_follow_up_message (msg, receive_time);
break;
case PTP_MESSAGE_TYPE_DELAY_RESP:
handle_delay_resp_message (msg, receive_time);
break;
default:
break;
}
}
static gboolean
have_stdin_data_cb (GIOChannel * channel, GIOCondition condition,
gpointer user_data)
{
GIOStatus status;
StdIOHeader header;
gchar buffer[8192];
GError *err = NULL;
gsize read;
if ((condition & G_IO_STATUS_EOF)) {
GST_ERROR ("Got EOF on stdin");
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
}
status =
g_io_channel_read_chars (channel, (gchar *) & header, sizeof (header),
&read, &err);
if (status == G_IO_STATUS_ERROR) {
GST_ERROR ("Failed to read from stdin: %s", err->message);
g_clear_error (&err);
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
} else if (status == G_IO_STATUS_EOF) {
GST_ERROR ("Got EOF on stdin");
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
} else if (status != G_IO_STATUS_NORMAL) {
GST_ERROR ("Unexpected stdin read status: %d", status);
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
} else if (read != sizeof (header)) {
GST_ERROR ("Unexpected read size: %" G_GSIZE_FORMAT, read);
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
} else if (header.size > 8192) {
GST_ERROR ("Unexpected size: %u", header.size);
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
}
status = g_io_channel_read_chars (channel, buffer, header.size, &read, &err);
if (status == G_IO_STATUS_ERROR) {
GST_ERROR ("Failed to read from stdin: %s", err->message);
g_clear_error (&err);
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
} else if (status == G_IO_STATUS_EOF) {
GST_ERROR ("EOF on stdin");
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
} else if (status != G_IO_STATUS_NORMAL) {
GST_ERROR ("Unexpected stdin read status: %d", status);
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
} else if (read != header.size) {
GST_ERROR ("Unexpected read size: %" G_GSIZE_FORMAT, read);
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
}
switch (header.type) {
case TYPE_EVENT:
case TYPE_GENERAL:{
GstClockTime receive_time = gst_clock_get_time (observation_system_clock);
PtpMessage msg;
if (parse_ptp_message (&msg, (const guint8 *) buffer, header.size)) {
dump_ptp_message (&msg);
handle_ptp_message (&msg, receive_time);
}
break;
}
default:
case TYPE_CLOCK_ID:{
if (header.size != 8) {
GST_ERROR ("Unexpected clock id size (%u != 8)", header.size);
g_main_loop_quit (main_loop);
return G_SOURCE_REMOVE;
}
g_mutex_lock (&ptp_lock);
ptp_clock_id.clock_identity = GST_READ_UINT64_BE (buffer);
ptp_clock_id.port_number = getpid ();
GST_DEBUG ("Got clock id 0x%016" G_GINT64_MODIFIER "x %u",
ptp_clock_id.clock_identity, ptp_clock_id.port_number);
g_cond_signal (&ptp_cond);
g_mutex_unlock (&ptp_lock);
break;
}
}
return G_SOURCE_CONTINUE;
}
/* Cleanup all announce messages and announce message senders
* that are timed out by now, and clean up all pending syncs
* that are missing their FOLLOW_UP or DELAY_RESP */
static gboolean
cleanup_cb (gpointer data)
{
GstClockTime now = gst_clock_get_time (observation_system_clock);
GList *l, *m, *n;
for (l = domain_data; l; l = l->next) {
PtpDomainData *domain = l->data;
for (n = domain->announce_senders; n;) {
PtpAnnounceSender *sender = n->data;
gboolean timed_out = TRUE;
/* Keep only 5 messages per sender around */
while (g_queue_get_length (&sender->announce_messages) > 5) {
PtpAnnounceMessage *msg = g_queue_pop_head (&sender->announce_messages);
g_free (msg);
}
for (m = sender->announce_messages.head; m; m = m->next) {
PtpAnnounceMessage *msg = m->data;
if (msg->receive_time +
sender->announce_interval * PTP_ANNOUNCE_RECEIPT_TIMEOUT > now) {
timed_out = FALSE;
break;
}
}
if (timed_out) {
GST_DEBUG ("Announce sender 0x%016" G_GINT64_MODIFIER "x %u timed out",
sender->master_clock_identity.clock_identity,
sender->master_clock_identity.port_number);
g_queue_foreach (&sender->announce_messages, (GFunc) g_free, NULL);
g_queue_clear (&sender->announce_messages);
}
if (g_queue_get_length (&sender->announce_messages) == 0) {
GList *tmp = n->next;
if (compare_clock_identity (&sender->master_clock_identity,
&domain->master_clock_identity) == 0)
GST_WARNING ("currently selected master clock timed out");
g_free (sender);
domain->announce_senders =
g_list_delete_link (domain->announce_senders, n);
n = tmp;
} else {
n = n->next;
}
}
select_best_master_clock (domain, now);
/* Clean up any pending syncs */
for (n = domain->pending_syncs.head; n;) {
PtpPendingSync *sync = n->data;
gboolean timed_out = FALSE;
/* Time out pending syncs after 4 sync intervals or 10 seconds,
* and pending delay reqs after 4 delay req intervals or 10 seconds
*/
if (sync->delay_req_send_time_local != GST_CLOCK_TIME_NONE &&
((domain->min_delay_req_interval != 0
&& sync->delay_req_send_time_local +
4 * domain->min_delay_req_interval < now)
|| (sync->delay_req_send_time_local + 10 * GST_SECOND < now))) {
timed_out = TRUE;
} else if ((domain->sync_interval != 0
&& sync->sync_recv_time_local + 4 * domain->sync_interval < now)
|| (sync->sync_recv_time_local + 10 * GST_SECOND < now)) {
timed_out = TRUE;
}
if (timed_out) {
GList *tmp = n->next;
ptp_pending_sync_free (sync);
g_queue_delete_link (&domain->pending_syncs, n);
n = tmp;
} else {
n = n->next;
}
}
}
return G_SOURCE_CONTINUE;
}
static gpointer
ptp_helper_main (gpointer data)
{
GSource *cleanup_source;
GST_DEBUG ("Starting PTP helper loop");
/* Check all 5 seconds, if we have to cleanup ANNOUNCE or pending syncs message */
cleanup_source = g_timeout_source_new_seconds (5);
g_source_set_priority (cleanup_source, G_PRIORITY_DEFAULT);
g_source_set_callback (cleanup_source, (GSourceFunc) cleanup_cb, NULL, NULL);
g_source_attach (cleanup_source, main_context);
g_source_unref (cleanup_source);
g_main_loop_run (main_loop);
GST_DEBUG ("Stopped PTP helper loop");
g_mutex_lock (&ptp_lock);
ptp_clock_id.clock_identity = GST_PTP_CLOCK_ID_NONE;
ptp_clock_id.port_number = 0;
initted = FALSE;
g_cond_signal (&ptp_cond);
g_mutex_unlock (&ptp_lock);
return NULL;
}
/**
* gst_ptp_is_supported:
*
* Check if PTP clocks are generally supported on this system, and if previous
* initializations did not fail.
*
* Returns: %TRUE if PTP clocks are generally supported on this system, and
* previous initializations did not fail.
*
* Since: 1.6
*/
gboolean
gst_ptp_is_supported (void)
{
return supported;
}
/**
* gst_ptp_is_initialized:
*
* Check if the GStreamer PTP clock subsystem is initialized.
*
* Returns: %TRUE if the GStreamer PTP clock subsystem is intialized.
*
* Since: 1.6
*/
gboolean
gst_ptp_is_initialized (void)
{
return initted;
}
/**
* gst_ptp_init:
* @clock_id: PTP clock id of this process' clock or %GST_PTP_CLOCK_ID_NONE
* @interfaces: (transfer none) (array zero-terminated=1) (allow-none): network interfaces to run the clock on
*
* Initialize the GStreamer PTP subsystem and create a PTP ordinary clock in
* slave-only mode for all domains on the given @interfaces with the
* given @clock_id.
*
* If @clock_id is %GST_PTP_CLOCK_ID_NONE, a clock id is automatically
* generated from the MAC address of the first network interface.
*
* This function is automatically called by gst_ptp_clock_new() with default
* parameters if it wasn't called before.
*
* Returns: %TRUE if the GStreamer PTP clock subsystem could be initialized.
*
* Since: 1.6
*/
gboolean
gst_ptp_init (guint64 clock_id, gchar ** interfaces)
{
gboolean ret;
const gchar *env;
gchar **argv = NULL;
gint argc, argc_c;
gint fd_r, fd_w;
GError *err = NULL;
GSource *stdin_source;
GST_DEBUG_CATEGORY_INIT (ptp_debug, "ptp", 0, "PTP clock");
g_mutex_lock (&ptp_lock);
if (!supported) {
GST_ERROR ("PTP not supported");
ret = FALSE;
goto done;
}
if (initted) {
GST_DEBUG ("PTP already initialized");
ret = TRUE;
goto done;
}
if (ptp_helper_pid) {
GST_DEBUG ("PTP currently initializing");
goto wait;
}
if (!domain_stats_hooks_initted) {
g_hook_list_init (&domain_stats_hooks, sizeof (GHook));
domain_stats_hooks_initted = TRUE;
}
argc = 1;
if (clock_id != GST_PTP_CLOCK_ID_NONE)
argc += 2;
if (interfaces != NULL)
argc += 2 * g_strv_length (interfaces);
argv = g_new0 (gchar *, argc + 2);
argc_c = 0;
env = g_getenv ("GST_PTP_HELPER_1_0");
if (env == NULL)
env = g_getenv ("GST_PTP_HELPER");
if (env != NULL && *env != '\0') {
GST_LOG ("Trying GST_PTP_HELPER env var: %s", env);
argv[argc_c++] = g_strdup (env);
} else {
argv[argc_c++] = g_strdup (GST_PTP_HELPER_INSTALLED);
}
if (clock_id != GST_PTP_CLOCK_ID_NONE) {
argv[argc_c++] = g_strdup ("-c");
argv[argc_c++] = g_strdup_printf ("0x%016" G_GINT64_MODIFIER "x", clock_id);
}
if (interfaces != NULL) {
gchar **ptr = interfaces;
while (*ptr) {
argv[argc_c++] = g_strdup ("-i");
argv[argc_c++] = g_strdup (*ptr);
ptr++;
}
}
main_context = g_main_context_new ();
main_loop = g_main_loop_new (main_context, FALSE);
ptp_helper_thread =
g_thread_try_new ("ptp-helper-thread", ptp_helper_main, NULL, &err);
if (!ptp_helper_thread) {
GST_ERROR ("Failed to start PTP helper thread: %s", err->message);
g_clear_error (&err);
ret = FALSE;
goto done;
}
if (!g_spawn_async_with_pipes (NULL, argv, NULL, 0, NULL, NULL,
&ptp_helper_pid, &fd_w, &fd_r, NULL, &err)) {
GST_ERROR ("Failed to start ptp helper process: %s", err->message);
g_clear_error (&err);
ret = FALSE;
supported = FALSE;
goto done;
}
stdin_channel = g_io_channel_unix_new (fd_r);
g_io_channel_set_encoding (stdin_channel, NULL, NULL);
g_io_channel_set_buffered (stdin_channel, FALSE);
g_io_channel_set_close_on_unref (stdin_channel, TRUE);
stdin_source =
g_io_create_watch (stdin_channel, G_IO_IN | G_IO_PRI | G_IO_HUP);
g_source_set_priority (stdin_source, G_PRIORITY_DEFAULT);
g_source_set_callback (stdin_source, (GSourceFunc) have_stdin_data_cb, NULL,
NULL);
g_source_attach (stdin_source, main_context);
g_source_unref (stdin_source);
/* Create stdout channel */
stdout_channel = g_io_channel_unix_new (fd_w);
g_io_channel_set_encoding (stdout_channel, NULL, NULL);
g_io_channel_set_close_on_unref (stdout_channel, TRUE);
g_io_channel_set_buffered (stdout_channel, FALSE);
delay_req_rand = g_rand_new ();
observation_system_clock =
g_object_new (GST_TYPE_SYSTEM_CLOCK, "name", "ptp-observation-clock",
NULL);
gst_object_ref_sink (observation_system_clock);
initted = TRUE;
wait:
GST_DEBUG ("Waiting for PTP to be initialized");
while (ptp_clock_id.clock_identity == GST_PTP_CLOCK_ID_NONE && initted)
g_cond_wait (&ptp_cond, &ptp_lock);
ret = initted;
if (ret) {
GST_DEBUG ("Initialized and got clock id 0x%016" G_GINT64_MODIFIER "x %u",
ptp_clock_id.clock_identity, ptp_clock_id.port_number);
} else {
GST_ERROR ("Failed to initialize");
supported = FALSE;
}
done:
g_strfreev (argv);
if (!ret) {
if (ptp_helper_pid) {
#ifndef G_OS_WIN32
kill (ptp_helper_pid, SIGKILL);
waitpid (ptp_helper_pid, NULL, 0);
#else
TerminateProcess (ptp_helper_pid, 1);
WaitForSingleObject (ptp_helper_pid, INFINITE);
#endif
g_spawn_close_pid (ptp_helper_pid);
}
ptp_helper_pid = 0;
if (stdin_channel)
g_io_channel_unref (stdin_channel);
stdin_channel = NULL;
if (stdout_channel)
g_io_channel_unref (stdout_channel);
stdout_channel = NULL;
if (main_loop && ptp_helper_thread) {
g_main_loop_quit (main_loop);
g_thread_join (ptp_helper_thread);
}
ptp_helper_thread = NULL;
if (main_loop)
g_main_loop_unref (main_loop);
main_loop = NULL;
if (main_context)
g_main_context_unref (main_context);
main_context = NULL;
if (delay_req_rand)
g_rand_free (delay_req_rand);
delay_req_rand = NULL;
if (observation_system_clock)
gst_object_unref (observation_system_clock);
observation_system_clock = NULL;
}
g_mutex_unlock (&ptp_lock);
return ret;
}
/**
* gst_ptp_deinit:
*
* Deinitialize the GStreamer PTP subsystem and stop the PTP clock. If there
* are any remaining GstPtpClock instances, they won't be further synchronized
* to the PTP network clock.
*
* Since: 1.6
*/
void
gst_ptp_deinit (void)
{
GList *l, *m;
g_mutex_lock (&ptp_lock);
if (ptp_helper_pid) {
#ifndef G_OS_WIN32
kill (ptp_helper_pid, SIGKILL);
waitpid (ptp_helper_pid, NULL, 0);
#else
TerminateProcess (ptp_helper_pid, 1);
WaitForSingleObject (ptp_helper_pid, INFINITE);
#endif
g_spawn_close_pid (ptp_helper_pid);
}
ptp_helper_pid = 0;
if (stdin_channel)
g_io_channel_unref (stdin_channel);
stdin_channel = NULL;
if (stdout_channel)
g_io_channel_unref (stdout_channel);
stdout_channel = NULL;
if (main_loop && ptp_helper_thread) {
GThread *tmp = ptp_helper_thread;
ptp_helper_thread = NULL;
g_mutex_unlock (&ptp_lock);
g_main_loop_quit (main_loop);
g_thread_join (tmp);
g_mutex_lock (&ptp_lock);
}
if (main_loop)
g_main_loop_unref (main_loop);
main_loop = NULL;
if (main_context)
g_main_context_unref (main_context);
main_context = NULL;
if (delay_req_rand)
g_rand_free (delay_req_rand);
delay_req_rand = NULL;
if (observation_system_clock)
gst_object_unref (observation_system_clock);
observation_system_clock = NULL;
for (l = domain_data; l; l = l->next) {
PtpDomainData *domain = l->data;
for (m = domain->announce_senders; m; m = m->next) {
PtpAnnounceSender *sender = m->data;
g_queue_foreach (&sender->announce_messages, (GFunc) g_free, NULL);
g_queue_clear (&sender->announce_messages);
g_free (sender);
}
g_list_free (domain->announce_senders);
g_queue_foreach (&domain->pending_syncs, (GFunc) ptp_pending_sync_free,
NULL);
g_queue_clear (&domain->pending_syncs);
gst_object_unref (domain->domain_clock);
g_free (domain);
}
g_list_free (domain_data);
domain_data = NULL;
g_list_foreach (domain_clocks, (GFunc) g_free, NULL);
g_list_free (domain_clocks);
domain_clocks = NULL;
ptp_clock_id.clock_identity = GST_PTP_CLOCK_ID_NONE;
ptp_clock_id.port_number = 0;
initted = FALSE;
g_mutex_unlock (&ptp_lock);
}
#define DEFAULT_DOMAIN 0
enum
{
PROP_0,
PROP_DOMAIN,
PROP_INTERNAL_CLOCK,
PROP_MASTER_CLOCK_ID,
PROP_GRANDMASTER_CLOCK_ID
};
#define GST_PTP_CLOCK_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_PTP_CLOCK, GstPtpClockPrivate))
struct _GstPtpClockPrivate
{
guint domain;
GstClock *domain_clock;
gulong domain_stats_id;
};
#define gst_ptp_clock_parent_class parent_class
G_DEFINE_TYPE (GstPtpClock, gst_ptp_clock, GST_TYPE_SYSTEM_CLOCK);
static void gst_ptp_clock_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_ptp_clock_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_ptp_clock_finalize (GObject * object);
static GstClockTime gst_ptp_clock_get_internal_time (GstClock * clock);
static void
gst_ptp_clock_class_init (GstPtpClockClass * klass)
{
GObjectClass *gobject_class;
GstClockClass *clock_class;
gobject_class = G_OBJECT_CLASS (klass);
clock_class = GST_CLOCK_CLASS (klass);
g_type_class_add_private (klass, sizeof (GstPtpClockPrivate));
gobject_class->finalize = gst_ptp_clock_finalize;
gobject_class->get_property = gst_ptp_clock_get_property;
gobject_class->set_property = gst_ptp_clock_set_property;
g_object_class_install_property (gobject_class, PROP_DOMAIN,
g_param_spec_uint ("domain", "Domain",
"The PTP domain", 0, G_MAXUINT8,
DEFAULT_DOMAIN,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_INTERNAL_CLOCK,
g_param_spec_object ("internal-clock", "Internal Clock",
"Internal clock", GST_TYPE_CLOCK,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MASTER_CLOCK_ID,
g_param_spec_uint64 ("master-clock-id", "Master Clock ID",
"Master Clock ID", 0, G_MAXUINT64, 0,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_GRANDMASTER_CLOCK_ID,
g_param_spec_uint64 ("grandmaster-clock-id", "Grand Master Clock ID",
"Grand Master Clock ID", 0, G_MAXUINT64, 0,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
clock_class->get_internal_time = gst_ptp_clock_get_internal_time;
}
static void
gst_ptp_clock_init (GstPtpClock * self)
{
GstPtpClockPrivate *priv;
self->priv = priv = GST_PTP_CLOCK_GET_PRIVATE (self);
GST_OBJECT_FLAG_SET (self, GST_CLOCK_FLAG_CAN_SET_MASTER);
GST_OBJECT_FLAG_SET (self, GST_CLOCK_FLAG_NEEDS_STARTUP_SYNC);
priv->domain = DEFAULT_DOMAIN;
}
static gboolean
gst_ptp_clock_ensure_domain_clock (GstPtpClock * self)
{
gboolean got_clock = TRUE;
if (G_UNLIKELY (!self->priv->domain_clock)) {
g_mutex_lock (&domain_clocks_lock);
if (!self->priv->domain_clock) {
GList *l;
got_clock = FALSE;
for (l = domain_clocks; l; l = l->next) {
PtpDomainData *clock_data = l->data;
if (clock_data->domain == self->priv->domain
&& clock_data->last_ptp_time != 0) {
self->priv->domain_clock = clock_data->domain_clock;
got_clock = TRUE;
break;
}
}
}
g_mutex_unlock (&domain_clocks_lock);
if (got_clock) {
g_object_notify (G_OBJECT (self), "internal-clock");
gst_clock_set_synced (GST_CLOCK (self), TRUE);
}
}
return got_clock;
}
static gboolean
gst_ptp_clock_stats_callback (guint8 domain, const GstStructure * stats,
gpointer user_data)
{
GstPtpClock *self = user_data;
if (domain != self->priv->domain
|| !gst_structure_has_name (stats, GST_PTP_STATISTICS_TIME_UPDATED))
return TRUE;
/* Let's set our internal clock */
if (!gst_ptp_clock_ensure_domain_clock (self))
return TRUE;
self->priv->domain_stats_id = 0;
return FALSE;
}
static void
gst_ptp_clock_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstPtpClock *self = GST_PTP_CLOCK (object);
switch (prop_id) {
case PROP_DOMAIN:
self->priv->domain = g_value_get_uint (value);
gst_ptp_clock_ensure_domain_clock (self);
if (!self->priv->domain_clock)
self->priv->domain_stats_id =
gst_ptp_statistics_callback_add (gst_ptp_clock_stats_callback, self,
NULL);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_ptp_clock_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstPtpClock *self = GST_PTP_CLOCK (object);
switch (prop_id) {
case PROP_DOMAIN:
g_value_set_uint (value, self->priv->domain);
break;
case PROP_INTERNAL_CLOCK:
gst_ptp_clock_ensure_domain_clock (self);
g_value_set_object (value, self->priv->domain_clock);
break;
case PROP_MASTER_CLOCK_ID:
case PROP_GRANDMASTER_CLOCK_ID:{
GList *l;
g_mutex_lock (&domain_clocks_lock);
g_value_set_uint64 (value, 0);
for (l = domain_clocks; l; l = l->next) {
PtpDomainData *clock_data = l->data;
if (clock_data->domain == self->priv->domain) {
if (prop_id == PROP_MASTER_CLOCK_ID)
g_value_set_uint64 (value,
clock_data->master_clock_identity.clock_identity);
else
g_value_set_uint64 (value, clock_data->grandmaster_identity);
break;
}
}
g_mutex_unlock (&domain_clocks_lock);
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_ptp_clock_finalize (GObject * object)
{
GstPtpClock *self = GST_PTP_CLOCK (object);
if (self->priv->domain_stats_id)
gst_ptp_statistics_callback_remove (self->priv->domain_stats_id);
G_OBJECT_CLASS (gst_ptp_clock_parent_class)->finalize (object);
}
static GstClockTime
gst_ptp_clock_get_internal_time (GstClock * clock)
{
GstPtpClock *self = GST_PTP_CLOCK (clock);
gst_ptp_clock_ensure_domain_clock (self);
if (!self->priv->domain_clock) {
GST_ERROR_OBJECT (self, "Domain %u has no clock yet and is not synced",
self->priv->domain);
return GST_CLOCK_TIME_NONE;
}
return gst_clock_get_time (self->priv->domain_clock);
}
/**
* gst_ptp_clock_new:
* @name: Name of the clock
* @domain: PTP domain
*
* Creates a new PTP clock instance that exports the PTP time of the master
* clock in @domain. This clock can be slaved to other clocks as needed.
*
* If gst_ptp_init() was not called before, this will call gst_ptp_init() with
* default parameters.
*
* This clock only returns valid timestamps after it received the first
* times from the PTP master clock on the network. Once this happens the
* GstPtpClock::internal-clock property will become non-NULL. You can
* check this with gst_clock_wait_for_sync(), the GstClock::synced signal and
* gst_clock_is_synced().
*
* Returns: (transfer full): A new #GstClock
*
* Since: 1.6
*/
GstClock *
gst_ptp_clock_new (const gchar * name, guint domain)
{
GstClock *clock;
g_return_val_if_fail (domain <= G_MAXUINT8, NULL);
if (!initted && !gst_ptp_init (GST_PTP_CLOCK_ID_NONE, NULL)) {
GST_ERROR ("Failed to initialize PTP");
return NULL;
}
clock = g_object_new (GST_TYPE_PTP_CLOCK, "name", name, "domain", domain,
NULL);
/* Clear floating flag */
gst_object_ref_sink (clock);
return clock;
}
typedef struct
{
guint8 domain;
const GstStructure *stats;
} DomainStatsMarshalData;
static void
domain_stats_marshaller (GHook * hook, DomainStatsMarshalData * data)
{
GstPtpStatisticsCallback callback = (GstPtpStatisticsCallback) hook->func;
if (!callback (data->domain, data->stats, hook->data))
g_hook_destroy (&domain_stats_hooks, hook->hook_id);
}
static void
emit_ptp_statistics (guint8 domain, const GstStructure * stats)
{
DomainStatsMarshalData data = { domain, stats };
g_mutex_lock (&ptp_lock);
g_hook_list_marshal (&domain_stats_hooks, TRUE,
(GHookMarshaller) domain_stats_marshaller, &data);
g_mutex_unlock (&ptp_lock);
}
/**
* gst_ptp_statistics_callback_add:
* @callback: GstPtpStatisticsCallback to call
* @user_data: Data to pass to the callback
* @destroy_data: GDestroyNotify to destroy the data
*
* Installs a new statistics callback for gathering PTP statistics. See
* GstPtpStatisticsCallback for a list of statistics that are provided.
*
* Returns: Id for the callback that can be passed to
* gst_ptp_statistics_callback_remove()
*
* Since: 1.6
*/
gulong
gst_ptp_statistics_callback_add (GstPtpStatisticsCallback callback,
gpointer user_data, GDestroyNotify destroy_data)
{
GHook *hook;
g_mutex_lock (&ptp_lock);
if (!domain_stats_hooks_initted) {
g_hook_list_init (&domain_stats_hooks, sizeof (GHook));
domain_stats_hooks_initted = TRUE;
}
hook = g_hook_alloc (&domain_stats_hooks);
hook->func = callback;
hook->data = user_data;
hook->destroy = destroy_data;
g_hook_prepend (&domain_stats_hooks, hook);
g_atomic_int_add (&domain_stats_n_hooks, 1);
g_mutex_unlock (&ptp_lock);
return hook->hook_id;
}
/**
* gst_ptp_statistics_callback_remove:
* @id: Callback id to remove
*
* Removes a PTP statistics callback that was previously added with
* gst_ptp_statistics_callback_add().
*
* Since: 1.6
*/
void
gst_ptp_statistics_callback_remove (gulong id)
{
g_mutex_lock (&ptp_lock);
if (g_hook_destroy (&domain_stats_hooks, id))
g_atomic_int_add (&domain_stats_n_hooks, -1);
g_mutex_unlock (&ptp_lock);
}