blob: e6c666fdc1ede2bf6916be993d57161d9f32c7de [file] [log] [blame]
/* GStreamer
* Copyright (C) 2015 Sebastian Dröge <>
* 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
* 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.
/* Create a PTP client clock and print times and statistics.
* When running this from a GStreamer build tree, you will have to set
* GST_PTP_HELPER to libs/gst/helpers/.libs/gst-ptp-helper and also
* make sure that it has the right permissions (setuid root or appropriate
* capabilities
* You can test this with any PTP compatible clock, e.g. ptpd from here:
* For testing the accuracy, you can use the PTP reflector available from
* or here
#include <gst/gst.h>
#include <gst/net/net.h>
static gint domain = 0;
static gboolean stats = FALSE;
static GOptionEntry opt_entries[] = {
{"domain", 'd', 0, G_OPTION_ARG_INT, &domain,
"PTP domain", NULL},
{"stats", 's', 0, G_OPTION_ARG_NONE, &stats,
"Print PTP statistics", NULL},
static gboolean
stats_cb (guint8 d, const GstStructure * stats, gpointer user_data)
if (d == domain) {
gchar *stats_str = gst_structure_to_string (stats);
g_print ("Got stats: %s\n", stats_str);
g_free (stats_str);
return TRUE;
main (gint argc, gchar ** argv)
GOptionContext *opt_ctx;
GstClock *clock;
GError *err = NULL;
opt_ctx = g_option_context_new ("- GStreamer PTP clock test app");
g_option_context_add_main_entries (opt_ctx, opt_entries, NULL);
g_option_context_add_group (opt_ctx, gst_init_get_option_group ());
if (!g_option_context_parse (opt_ctx, &argc, &argv, &err))
g_error ("Error parsing options: %s", err->message);
g_option_context_free (opt_ctx);
if (!gst_ptp_init (GST_PTP_CLOCK_ID_NONE, NULL))
g_error ("failed to init ptp");
if (stats)
gst_ptp_statistics_callback_add (stats_cb, NULL, NULL);
clock = gst_ptp_clock_new ("test-clock", domain);
gst_clock_wait_for_sync (GST_CLOCK (clock), GST_CLOCK_TIME_NONE);
while (TRUE) {
GstClockTime local, remote;
GstClockTimeDiff diff;
local = g_get_real_time () * 1000;
remote = gst_clock_get_time (clock);
diff = GST_CLOCK_DIFF (local, remote);
g_print ("local: %" GST_TIME_FORMAT " ptp: %" GST_TIME_FORMAT " diff: %s%"
(diff < 0 ? "-" : " "), GST_TIME_ARGS (ABS (diff)));
g_usleep (100000);
return 0;