mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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b1cb4a633c
Original commit message from CVS: * libs/gst/net/gstnetclientclock.c: (inet_aton), (gst_net_client_clock_init), (gst_net_client_clock_finalize), (gst_net_client_clock_do_select), (gst_net_client_clock_new): * libs/gst/net/gstnetclientclock.h: * libs/gst/net/gstnettimepacket.c: (gst_net_time_packet_send): * libs/gst/net/gstnettimepacket.h: * libs/gst/net/gstnettimeprovider.c: (inet_aton), (gst_net_time_provider_init), (gst_net_time_provider_finalize), (gst_net_time_provider_thread), (gst_net_time_provider_new): * libs/gst/net/gstnettimeprovider.h: Make stuff compile on windows. Fixes #345295.
648 lines
17 KiB
C
648 lines
17 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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/**
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* SECTION:gstnetclientclock
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* @short_description: Special clock that synchronizes to a remote time
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* provider.
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* @see_also: #GstClock, #GstNetTimeProvider, #GstPipeline
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*
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* This object implements a custom #GstClock that synchronizes its time
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* to a remote time provider such as #GstNetTimeProvider.
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*
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* A new clock is created with gst_net_client_clock_new() which takes the
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* address and port of the remote time provider along with a name and
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* an initial time.
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*
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* This clock will poll the time provider and will update its calibration
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* parameters based on the local and remote observations.
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*
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* Various parameters of the clock can be configured with the parent #GstClock
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* "timeout", "window-size" and "window-threshold" object properties.
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*
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* A #GstNetClientClock is typically set on a #GstPipeline with
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* gst_pipeline_use_clock().
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*
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* Last reviewed on 2005-11-23 (0.9.5)
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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_STATIC (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_TIMEOUT GST_SECOND
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#ifdef G_OS_WIN32
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#define getsockname(sock,addr,len) getsockname(sock,addr,(int *)len)
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#endif
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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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};
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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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#ifdef G_OS_WIN32
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static int
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inet_aton (const char *c, struct in_addr *paddr)
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{
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/* note that inet_addr is deprecated on unix because
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* inet_addr returns -1 (INADDR_NONE) for the valid 255.255.255.255
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* address. */
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paddr->s_addr = inet_addr (c);
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if (paddr->s_addr == INADDR_NONE)
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return 0;
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return 1;
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}
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#endif
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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 = G_OBJECT_CLASS (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 (gobject_class, 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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}
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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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GstClock *clock = GST_CLOCK_CAST (self);
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#ifdef G_OS_WIN32
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WSADATA w;
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int error = WSAStartup (0x0202, &w);
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if (error) {
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GST_DEBUG_OBJECT (self, "Error on WSAStartup");
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}
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if (w.wVersion != 0x0202) {
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WSACleanup ();
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}
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#endif
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self->port = DEFAULT_PORT;
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self->address = g_strdup (DEFAULT_ADDRESS);
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clock->timeout = DEFAULT_TIMEOUT;
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self->sock = -1;
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self->thread = NULL;
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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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#ifdef G_OS_WIN32
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WSACleanup ();
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#endif
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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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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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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_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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gdouble r_squared;
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GstClock *clock;
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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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clock = GST_CLOCK_CAST (self);
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gst_clock_add_observation (GST_CLOCK (self), local_avg, remote, &r_squared);
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GST_CLOCK_SLAVE_LOCK (self);
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if (clock->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, clock->timeout);
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}
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GST_CLOCK_SLAVE_UNLOCK (clock);
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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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#ifdef G_OS_WIN32
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if (((max_sock + 1) != READ_SOCKET (self)) ||
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((max_sock + 1) != WRITE_SOCKET (self))) {
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ret =
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select (max_sock + 1, readfds, NULL, NULL, (struct timeval *) ptv);
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} else {
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ret = 1;
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}
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#else
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ret = select (max_sock + 1, readfds, NULL, NULL, (struct timeval *) ptv);
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#endif
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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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GstClock *clock = data;
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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,
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GST_TIME_ARGS (packet->local_time));
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gst_net_time_packet_send (packet, self->sock,
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(struct sockaddr *) self->servaddr, sizeof (struct sockaddr_in));
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g_free (packet);
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/* reset timeout */
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self->current_timeout = clock->timeout;
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continue;
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} else if (FD_ISSET (self->sock, &read_fds)) {
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/* got data in */
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GstClockTime new_local = gst_clock_get_internal_time (GST_CLOCK (self));
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len = sizeof (struct sockaddr);
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packet = gst_net_time_packet_receive (self->sock,
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(struct sockaddr *) &tmpaddr, &len);
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if (!packet)
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goto receive_error;
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DEBUG ("got packet back");
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DEBUG ("local_1 = %" GST_TIME_FORMAT, GST_TIME_ARGS (packet->local_time));
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DEBUG ("remote = %" GST_TIME_FORMAT, GST_TIME_ARGS (packet->remote_time));
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DEBUG ("local_2 = %" GST_TIME_FORMAT, GST_TIME_ARGS (new_local));
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/* observe_times will reset the timeout */
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gst_net_client_clock_observe_times (self, packet->local_time,
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packet->remote_time, new_local);
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g_free (packet);
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continue;
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} else {
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GST_WARNING_OBJECT (self, "unhandled select return state?");
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continue;
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}
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g_assert_not_reached ();
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stopped:
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{
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GST_DEBUG_OBJECT (self, "shutting down");
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/* socket gets closed in _stop() */
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return NULL;
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}
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receive_error:
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{
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GST_WARNING_OBJECT (self, "receive error");
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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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g_assert_not_reached ();
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return NULL;
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}
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static gboolean
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gst_net_client_clock_start (GstNetClientClock * self)
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{
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struct sockaddr_in servaddr, myaddr;
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socklen_t len;
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gint ret;
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GError *error;
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g_return_val_if_fail (self->address != NULL, FALSE);
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g_return_val_if_fail (self->servaddr == NULL, FALSE);
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if ((ret = socket (AF_INET, SOCK_DGRAM, 0)) < 0)
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goto no_socket;
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self->sock = ret;
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len = sizeof (myaddr);
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ret = getsockname (self->sock, (struct sockaddr *) &myaddr, &len);
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if (ret < 0)
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goto getsockname_error;
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memset (&servaddr, 0, sizeof (servaddr));
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servaddr.sin_family = AF_INET; /* host byte order */
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servaddr.sin_port = htons (self->port); /* short, network byte order */
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GST_DEBUG_OBJECT (self, "socket opened on UDP port %hd",
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ntohs (servaddr.sin_port));
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if (!inet_aton (self->address, &servaddr.sin_addr))
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goto bad_address;
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self->servaddr = g_malloc (sizeof (struct sockaddr_in));
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memcpy (self->servaddr, &servaddr, sizeof (servaddr));
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|
|
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;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_net_client_clock_new:
|
|
* @name: a name for the clock
|
|
* @remote_address: the address of the remote clock provider
|
|
* @remote_port: the port of the remote clock provider
|
|
* @base_time: initial time of the clock
|
|
*
|
|
* Create a new #GstNetClientClock that will report the time
|
|
* provided by the #GstNetClockProvider on @remote_address and
|
|
* @remote_port.
|
|
*
|
|
* Returns: a new #GstClock that receives a time from the remote
|
|
* clock.
|
|
*/
|
|
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, 1);
|
|
|
|
{
|
|
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!");
|
|
}
|
|
|
|
#ifdef G_OS_WIN32
|
|
GST_DEBUG_OBJECT (ret, "creating pipe");
|
|
if ((iret = pipe (CONTROL_SOCKETS (ret))) < 0)
|
|
goto no_socket_pair;
|
|
#else
|
|
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);
|
|
#endif
|
|
|
|
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;
|
|
}
|
|
}
|