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Original commit message from CVS: 2005-11-18 Andy Wingo <wingo@pobox.com> * gst/net/gstnetclientclock.c (do_linear_regression): Use all integer arithmetic. Return the minimum of the domain, which can be set as "internal" for gst_clock_set_calibration. (gst_net_client_clock_observe_times): Call _set_calibration. (gst_net_client_clock_new): Call _set_calibration instead of rate_offset. * check/net/gstnetclientclock.c (test_functioning): Use the right adjustment api. * gst/gstclock.h: * gst/gstclock.c (gst_clock_get_calibration) (gst_clock_set_calibration): New functions, obsolete the ones I added yesterday. Doh. Precision issues mean we have to extrapolate from a point in the more recent past than 1970. (gst_clock_get_rate_offset, gst_clock_set_rate_offset): Mark as obsolete. (gst_clock_adjust_unlocked): Use the right calibration data.
691 lines
19 KiB
C
691 lines
19 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2005 Wim Taymans <wim@fluendo.com>
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* 2005 Andy Wingo <wingo@pobox.com>
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*
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* gstnetclientclock.h: clock that synchronizes itself to a time provider over
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* the network
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <unistd.h>
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#include "gstnettimepacket.h"
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#include "gstnetclientclock.h"
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GST_DEBUG_CATEGORY (ncc_debug);
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#define GST_CAT_DEFAULT (ncc_debug)
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#define DEBUGGING_ENABLED
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#ifdef DEBUGGING_ENABLED
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#define DEBUG(x, args...) g_print (x "\n", ##args)
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#else
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#define DEBUG(x, args...) /* nop */
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#endif
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/* the select call is also performed on the control sockets, that way
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* we can send special commands to unblock or restart the select call */
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#define CONTROL_RESTART 'R' /* restart the select call */
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#define CONTROL_STOP 'S' /* stop the select call */
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#define CONTROL_SOCKETS(self) self->control_sock
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#define WRITE_SOCKET(self) self->control_sock[1]
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#define READ_SOCKET(self) self->control_sock[0]
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#define SEND_COMMAND(self, command) \
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G_STMT_START { \
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unsigned char c; c = command; \
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write (WRITE_SOCKET(self), &c, 1); \
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} G_STMT_END
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#define READ_COMMAND(self, command, res) \
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G_STMT_START { \
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res = read(READ_SOCKET(self), &command, 1); \
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} G_STMT_END
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#define DEFAULT_ADDRESS "127.0.0.1"
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#define DEFAULT_PORT 5637
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#define DEFAULT_WINDOW_SIZE 32
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#define DEFAULT_TIMEOUT GST_SECOND
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enum
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{
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PROP_0,
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PROP_ADDRESS,
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PROP_PORT,
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PROP_WINDOW_SIZE,
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PROP_TIMEOUT
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};
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#define _do_init(type) \
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GST_DEBUG_CATEGORY_INIT (ncc_debug, "netclock", 0, "Network client clock");
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GST_BOILERPLATE_FULL (GstNetClientClock, gst_net_client_clock,
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GstSystemClock, GST_TYPE_SYSTEM_CLOCK, _do_init);
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static void gst_net_client_clock_finalize (GObject * object);
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static void gst_net_client_clock_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_net_client_clock_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_net_client_clock_stop (GstNetClientClock * self);
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static void
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gst_net_client_clock_base_init (gpointer g_class)
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{
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/* nop */
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}
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static void
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gst_net_client_clock_class_init (GstNetClientClockClass * klass)
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{
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GObjectClass *gobject_class;
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gobject_class = (GObjectClass *) klass;
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gobject_class->finalize = gst_net_client_clock_finalize;
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gobject_class->get_property = gst_net_client_clock_get_property;
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gobject_class->set_property = gst_net_client_clock_set_property;
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g_object_class_install_property (gobject_class, PROP_ADDRESS,
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g_param_spec_string ("address", "address",
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"The address of the machine providing a time server, "
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"as a dotted quad (x.x.x.x)", DEFAULT_ADDRESS, G_PARAM_READWRITE));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_PORT,
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g_param_spec_int ("port", "port",
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"The port on which the remote server is listening", 0, G_MAXUINT16,
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DEFAULT_PORT, G_PARAM_READWRITE));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_WINDOW_SIZE,
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g_param_spec_int ("window-size", "Window size",
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"The size of the window used to calculate rate and offset", 2, 1024,
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DEFAULT_WINDOW_SIZE, G_PARAM_READWRITE));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TIMEOUT,
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g_param_spec_uint64 ("timeout", "Timeout",
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"The amount of time, in nanoseconds, to wait for replies", 0,
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G_MAXUINT64, DEFAULT_TIMEOUT, G_PARAM_READWRITE));
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}
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static void
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gst_net_client_clock_init (GstNetClientClock * self,
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GstNetClientClockClass * g_class)
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{
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self->port = DEFAULT_PORT;
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self->address = g_strdup (DEFAULT_ADDRESS);
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self->window_size = DEFAULT_WINDOW_SIZE;
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self->timeout = DEFAULT_TIMEOUT;
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self->sock = -1;
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self->thread = NULL;
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self->filling = TRUE;
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self->time_index = 0;
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self->local_times = g_new0 (GstClockTime, self->window_size);
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self->remote_times = g_new0 (GstClockTime, self->window_size);
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self->servaddr = NULL;
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READ_SOCKET (self) = -1;
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WRITE_SOCKET (self) = -1;
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}
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static void
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gst_net_client_clock_finalize (GObject * object)
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{
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GstNetClientClock *self = GST_NET_CLIENT_CLOCK (object);
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if (self->thread) {
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gst_net_client_clock_stop (self);
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g_assert (self->thread == NULL);
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}
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if (READ_SOCKET (self) != -1) {
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close (READ_SOCKET (self));
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close (WRITE_SOCKET (self));
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READ_SOCKET (self) = -1;
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WRITE_SOCKET (self) = -1;
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}
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g_free (self->address);
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self->address = NULL;
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g_free (self->servaddr);
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self->servaddr = NULL;
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g_free (self->local_times);
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self->local_times = NULL;
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g_free (self->remote_times);
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self->remote_times = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_net_client_clock_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstNetClientClock *self = GST_NET_CLIENT_CLOCK (object);
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switch (prop_id) {
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case PROP_ADDRESS:
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g_free (self->address);
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if (g_value_get_string (value) == NULL)
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self->address = g_strdup (DEFAULT_ADDRESS);
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else
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self->address = g_strdup (g_value_get_string (value));
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break;
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case PROP_PORT:
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self->port = g_value_get_int (value);
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break;
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case PROP_WINDOW_SIZE:
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self->window_size = g_value_get_int (value);
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break;
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case PROP_TIMEOUT:
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self->timeout = g_value_get_uint64 (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_net_client_clock_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstNetClientClock *self = GST_NET_CLIENT_CLOCK (object);
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switch (prop_id) {
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case PROP_ADDRESS:
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g_value_set_string (value, self->address);
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break;
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case PROP_PORT:
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g_value_set_int (value, self->port);
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break;
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case PROP_WINDOW_SIZE:
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g_value_set_int (value, self->window_size);
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break;
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case PROP_TIMEOUT:
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g_value_set_uint64 (value, self->timeout);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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/* http://mathworld.wolfram.com/LeastSquaresFitting.html */
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static gboolean
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do_linear_regression (GstClockTime * x, GstClockTime * y, gint n, gdouble * m,
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GstClockTime * b, GstClockTime * xbase, gdouble * r_squared)
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{
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GstClockTime *newx, *newy;
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GstClockTime xmin, ymin, xbar, ybar;
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GstClockTimeDiff sxx, sxy, syy;
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gint i;
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xbar = ybar = sxx = syy = sxy = 0;
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#ifdef DEBUGGING_ENABLED
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DEBUG ("doing regression on:");
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for (i = 0; i < n; i++)
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DEBUG (" %" G_GUINT64_FORMAT " %" G_GUINT64_FORMAT, x[i], y[i]);
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#endif
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xmin = ymin = G_MAXUINT64;
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for (i = 0; i < n; i++) {
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xmin = MIN (xmin, x[i]);
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ymin = MIN (ymin, y[i]);
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}
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DEBUG ("min x: %" G_GUINT64_FORMAT, xmin);
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DEBUG ("min y: %" G_GUINT64_FORMAT, ymin);
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newx = g_new (GstClockTime, n);
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newy = g_new (GstClockTime, n);
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/* strip off unnecessary bits of precision */
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for (i = 0; i < n; i++) {
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newx[i] = x[i] - xmin;
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newy[i] = y[i] - ymin;
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}
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#ifdef DEBUGGING_ENABLED
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DEBUG ("reduced numbers:");
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for (i = 0; i < n; i++)
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DEBUG (" %" G_GUINT64_FORMAT " %" G_GUINT64_FORMAT, newx[i], newy[i]);
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#endif
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/* have to do this precisely otherwise the results are pretty much useless.
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* should guarantee that none of these accumulators can overflow */
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/* quantities on the order of 1e10 -> 30 bits; window size a max of 2^10, so
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this addition could end up around 2^40 or so -- ample headroom */
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for (i = 0; i < n; i++) {
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xbar += newx[i];
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ybar += newy[i];
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}
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xbar /= n;
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ybar /= n;
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DEBUG (" xbar = %" G_GUINT64_FORMAT, xbar);
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DEBUG (" ybar = %" G_GUINT64_FORMAT, ybar);
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/* multiplying directly would give quantities on the order of 1e20 -> 60 bits;
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times the window size that's 70 which is too much. Instead we (1) subtract
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off the xbar*ybar in the loop instead of after, to avoid accumulation; (2)
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shift off 4 bits from each multiplicand, giving an expected ceiling of 52
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bits, which should be enough. Need to check the incoming range and domain
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to ensure this is an appropriate loss of precision though. */
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for (i = 0; i < n; i++) {
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sxx += (newx[i] >> 4) * (newx[i] >> 4) - (xbar >> 4) * (xbar >> 4);
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syy += (newy[i] >> 4) * (newy[i] >> 4) - (ybar >> 4) * (ybar >> 4);
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sxy += (newx[i] >> 4) * (newy[i] >> 4) - (xbar >> 4) * (ybar >> 4);
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}
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*m = ((double) sxy) / sxx;
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*xbase = xmin;
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*b = (ybar + ymin) - (GstClockTime) (xbar * *m);
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*r_squared = ((double) sxy * (double) sxy) / ((double) sxx * (double) syy);
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DEBUG (" m = %g", *m);
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DEBUG (" b = %" G_GUINT64_FORMAT, *b);
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DEBUG (" xbase = %" G_GUINT64_FORMAT, *xbase);
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DEBUG (" r2 = %g", *r_squared);
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g_free (newx);
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g_free (newy);
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return TRUE;
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}
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static void
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gst_net_client_clock_observe_times (GstNetClientClock * self,
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GstClockTime local_1, GstClockTime remote, GstClockTime local_2)
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{
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GstClockTime local_avg;
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GstClockTime b, xbase;
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gdouble m, r_squared;
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if (local_2 < local_1)
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goto bogus_observation;
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local_avg = (local_2 + local_1) / 2;
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self->local_times[self->time_index] = local_avg;
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self->remote_times[self->time_index] = remote;
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self->time_index++;
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if (self->time_index == self->window_size) {
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self->filling = FALSE;
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self->time_index = 0;
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}
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if (!self->filling || self->time_index >= 4) {
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/* need to allow tuning of the "4" parameter -- means that we need 4 samples
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* before beginning to adjust the clock */
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do_linear_regression (self->local_times, self->remote_times,
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self->filling ? self->time_index : self->window_size, &m, &b,
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&xbase, &r_squared);
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GST_LOG_OBJECT (self, "adjusting clock to m=%g, b=%" G_GINT64_FORMAT
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" (rsquared=%g)", m, b, r_squared);
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gst_clock_set_calibration (GST_CLOCK (self), xbase, b, m);
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}
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if (self->filling) {
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self->current_timeout = 0;
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} else {
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/* geto formula */
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self->current_timeout =
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(1e-3 / (1 - MIN (r_squared, 0.99999))) * GST_SECOND;
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self->current_timeout = MIN (self->current_timeout, self->timeout);
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}
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return;
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bogus_observation:
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{
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GST_WARNING_OBJECT (self, "time packet receive time < send time (%",
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GST_TIME_FORMAT, " < %" GST_TIME_FORMAT ")", GST_TIME_ARGS (local_1),
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GST_TIME_ARGS (local_2));
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return;
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}
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}
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static gint
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gst_net_client_clock_do_select (GstNetClientClock * self, fd_set * readfds)
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{
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gint max_sock;
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gint ret;
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while (TRUE) {
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FD_ZERO (readfds);
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FD_SET (self->sock, readfds);
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FD_SET (READ_SOCKET (self), readfds);
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max_sock = MAX (self->sock, READ_SOCKET (self));
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GST_LOG_OBJECT (self, "doing select");
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{
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GstClockTime diff;
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GTimeVal tv, *ptv = &tv;
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diff = gst_clock_get_internal_time (GST_CLOCK (self));
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GST_TIME_TO_TIMEVAL (self->current_timeout, tv);
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ret = select (max_sock + 1, readfds, NULL, NULL, (struct timeval *) ptv);
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diff = gst_clock_get_internal_time (GST_CLOCK (self)) - diff;
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if (diff > self->current_timeout)
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self->current_timeout = 0;
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else
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self->current_timeout -= diff;
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}
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GST_LOG_OBJECT (self, "select returned %d", ret);
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if (ret < 0) {
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if (errno != EAGAIN && errno != EINTR)
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goto select_error;
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else
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continue;
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} else {
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return ret;
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}
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g_assert_not_reached ();
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/* log errors and keep going */
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select_error:
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{
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GST_WARNING_OBJECT (self, "select error %d: %s (%d)", ret,
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g_strerror (errno), errno);
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continue;
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}
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}
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g_assert_not_reached ();
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return -1;
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}
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static gpointer
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gst_net_client_clock_thread (gpointer data)
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{
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GstNetClientClock *self = data;
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struct sockaddr_in tmpaddr;
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socklen_t len;
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fd_set read_fds;
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GstNetTimePacket *packet;
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gint ret;
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while (TRUE) {
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ret = gst_net_client_clock_do_select (self, &read_fds);
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if (FD_ISSET (READ_SOCKET (self), &read_fds)) {
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/* got control message */
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while (TRUE) {
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gchar command;
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int res;
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READ_COMMAND (self, command, res);
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if (res < 0) {
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GST_LOG_OBJECT (self, "no more commands");
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break;
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}
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DEBUG ("control message: '%c'", command);
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switch (command) {
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case CONTROL_STOP:
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/* break out of the select loop */
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GST_LOG_OBJECT (self, "stop");
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goto stopped;
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default:
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GST_WARNING_OBJECT (self, "unknown message: '%c'", command);
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g_warning ("netclientclock: unknown control message received");
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continue;
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}
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g_assert_not_reached ();
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}
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continue;
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} else if (ret == 0) {
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/* timed out, let's send another packet */
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DEBUG ("timed out");
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packet = gst_net_time_packet_new (NULL);
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packet->local_time = gst_clock_get_internal_time (GST_CLOCK (self));
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DEBUG ("sending packet, local time = %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (packet->local_time));
|
|
gst_net_time_packet_send (packet, self->sock,
|
|
(struct sockaddr *) self->servaddr, sizeof (struct sockaddr_in));
|
|
|
|
g_free (packet);
|
|
|
|
/* reset timeout */
|
|
self->current_timeout = self->timeout;
|
|
continue;
|
|
} else if (FD_ISSET (self->sock, &read_fds)) {
|
|
/* got data in */
|
|
GstClockTime new_local = gst_clock_get_internal_time (GST_CLOCK (self));
|
|
|
|
len = sizeof (struct sockaddr);
|
|
packet = gst_net_time_packet_receive (self->sock,
|
|
(struct sockaddr *) &tmpaddr, &len);
|
|
|
|
if (!packet)
|
|
goto receive_error;
|
|
|
|
DEBUG ("got packet back");
|
|
DEBUG ("local_1 = %" GST_TIME_FORMAT, GST_TIME_ARGS (packet->local_time));
|
|
DEBUG ("remote = %" GST_TIME_FORMAT, GST_TIME_ARGS (packet->remote_time));
|
|
DEBUG ("local_2 = %" GST_TIME_FORMAT, GST_TIME_ARGS (new_local));
|
|
|
|
/* observe_times will reset the timeout */
|
|
gst_net_client_clock_observe_times (self, packet->local_time,
|
|
packet->remote_time, new_local);
|
|
|
|
g_free (packet);
|
|
continue;
|
|
} else {
|
|
GST_WARNING_OBJECT (self, "unhandled select return state?");
|
|
continue;
|
|
}
|
|
|
|
g_assert_not_reached ();
|
|
|
|
stopped:
|
|
{
|
|
GST_DEBUG_OBJECT (self, "shutting down");
|
|
/* socket gets closed in _stop() */
|
|
return NULL;
|
|
}
|
|
receive_error:
|
|
{
|
|
GST_WARNING_OBJECT (self, "receive error");
|
|
continue;
|
|
}
|
|
|
|
g_assert_not_reached ();
|
|
|
|
}
|
|
|
|
g_assert_not_reached ();
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static gboolean
|
|
gst_net_client_clock_start (GstNetClientClock * self)
|
|
{
|
|
struct sockaddr_in servaddr, myaddr;
|
|
socklen_t len;
|
|
gint ret;
|
|
GError *error;
|
|
|
|
g_return_val_if_fail (self->address != NULL, FALSE);
|
|
g_return_val_if_fail (self->servaddr == NULL, FALSE);
|
|
|
|
if ((ret = socket (AF_INET, SOCK_DGRAM, 0)) < 0)
|
|
goto no_socket;
|
|
|
|
self->sock = ret;
|
|
|
|
len = sizeof (myaddr);
|
|
ret = getsockname (self->sock, (struct sockaddr *) &myaddr, &len);
|
|
if (ret < 0)
|
|
goto getsockname_error;
|
|
|
|
GST_DEBUG_OBJECT (self, "socket opened on UDP port %hd",
|
|
ntohs (servaddr.sin_port));
|
|
|
|
memset (&servaddr, 0, sizeof (servaddr));
|
|
servaddr.sin_family = AF_INET; /* host byte order */
|
|
servaddr.sin_port = htons (self->port); /* short, network byte order */
|
|
if (!inet_aton (self->address, &servaddr.sin_addr))
|
|
goto bad_address;
|
|
|
|
self->servaddr = g_malloc (sizeof (struct sockaddr_in));
|
|
memcpy (self->servaddr, &servaddr, sizeof (servaddr));
|
|
|
|
GST_DEBUG_OBJECT (self, "will communicate with %s:%d", self->address,
|
|
self->port);
|
|
|
|
self->thread = g_thread_create (gst_net_client_clock_thread, self, TRUE,
|
|
&error);
|
|
if (!self->thread)
|
|
goto no_thread;
|
|
|
|
return TRUE;
|
|
|
|
/* ERRORS */
|
|
no_socket:
|
|
{
|
|
GST_ERROR_OBJECT (self, "socket failed %d: %s (%d)", ret,
|
|
g_strerror (errno), errno);
|
|
return FALSE;
|
|
}
|
|
getsockname_error:
|
|
{
|
|
GST_ERROR_OBJECT (self, "getsockname failed %d: %s (%d)", ret,
|
|
g_strerror (errno), errno);
|
|
close (self->sock);
|
|
self->sock = -1;
|
|
return FALSE;
|
|
}
|
|
bad_address:
|
|
{
|
|
GST_ERROR_OBJECT (self, "inet_aton failed %d: %s (%d)", ret,
|
|
g_strerror (errno), errno);
|
|
close (self->sock);
|
|
self->sock = -1;
|
|
return FALSE;
|
|
}
|
|
no_thread:
|
|
{
|
|
GST_ERROR_OBJECT (self, "could not create thread: %s", error->message);
|
|
close (self->sock);
|
|
self->sock = -1;
|
|
g_free (self->servaddr);
|
|
self->servaddr = NULL;
|
|
g_error_free (error);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static void
|
|
gst_net_client_clock_stop (GstNetClientClock * self)
|
|
{
|
|
SEND_COMMAND (self, CONTROL_STOP);
|
|
g_thread_join (self->thread);
|
|
self->thread = NULL;
|
|
|
|
if (self->sock != -1) {
|
|
close (self->sock);
|
|
self->sock = -1;
|
|
}
|
|
}
|
|
|
|
GstClock *
|
|
gst_net_client_clock_new (gchar * name, const gchar * remote_address,
|
|
gint remote_port, GstClockTime base_time)
|
|
{
|
|
GstNetClientClock *ret;
|
|
GstClockTime internal;
|
|
gint iret;
|
|
|
|
g_return_val_if_fail (remote_address != NULL, NULL);
|
|
g_return_val_if_fail (remote_port > 0, NULL);
|
|
g_return_val_if_fail (remote_port <= G_MAXUINT16, NULL);
|
|
g_return_val_if_fail (base_time != GST_CLOCK_TIME_NONE, NULL);
|
|
|
|
ret = g_object_new (GST_TYPE_NET_CLIENT_CLOCK, "address", remote_address,
|
|
"port", remote_port, NULL);
|
|
|
|
/* gst_clock_get_time() values are guaranteed to be increasing. because no one
|
|
* has called get_time on this clock yet we are free to adjust to any value
|
|
* without worrying about worrying about MAX() issues with the clock's
|
|
* internal time.
|
|
*/
|
|
|
|
/* update our internal time so get_time() give something around base_time.
|
|
assume that the rate is 1 in the beginning. */
|
|
internal = gst_clock_get_internal_time (GST_CLOCK (ret));
|
|
gst_clock_set_calibration (GST_CLOCK (ret), internal, base_time, 1.0);
|
|
|
|
{
|
|
GstClockTime now = gst_clock_get_time (GST_CLOCK (ret));
|
|
|
|
if (now < base_time || now > base_time + GST_SECOND)
|
|
g_warning ("unable to set the base time, expect sync problems!");
|
|
}
|
|
|
|
GST_DEBUG_OBJECT (ret, "creating socket pair");
|
|
if ((iret = socketpair (PF_UNIX, SOCK_STREAM, 0, CONTROL_SOCKETS (ret))) < 0)
|
|
goto no_socket_pair;
|
|
|
|
fcntl (READ_SOCKET (ret), F_SETFL, O_NONBLOCK);
|
|
fcntl (WRITE_SOCKET (ret), F_SETFL, O_NONBLOCK);
|
|
|
|
if (!gst_net_client_clock_start (ret))
|
|
goto failed_start;
|
|
|
|
/* all systems go, cap'n */
|
|
return (GstClock *) ret;
|
|
|
|
no_socket_pair:
|
|
{
|
|
GST_ERROR_OBJECT (ret, "no socket pair %d: %s (%d)", iret,
|
|
g_strerror (errno), errno);
|
|
gst_object_unref (ret);
|
|
return NULL;
|
|
}
|
|
failed_start:
|
|
{
|
|
/* already printed a nice error */
|
|
gst_object_unref (ret);
|
|
return NULL;
|
|
}
|
|
}
|