/* GStreamer * Copyright (C) 2005 Andy Wingo * * 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:gstnettimeprovider * @short_description: Special object that exposed the time of a clock * on the network. * @see_also: #GstClock, #GstNetClientClock, #GstPipeline * * This object exposes the time of a #GstClock on the network. * * A #GstNetTimeProvider is created with gst_net_time_provider_new() which * takes a #GstClock, an address and a port number as arguments. * * After creating the object, a client clock such as #GstNetClientClock can * query the exposed clock over the network for its values. * * The #GstNetTimeProvider typically wraps the clock used by a #GstPipeline. * * Last reviewed on 2005-11-23 (0.9.5) */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "gstnettimeprovider.h" #include "gstnettimepacket.h" GST_DEBUG_CATEGORY_STATIC (ntp_debug); #define GST_CAT_DEFAULT (ntp_debug) #define DEFAULT_ADDRESS "0.0.0.0" #define DEFAULT_PORT 5637 #define IS_ACTIVE(self) (g_atomic_int_get (&((self)->priv->active))) enum { PROP_0, PROP_PORT, PROP_ADDRESS, PROP_CLOCK, PROP_ACTIVE }; #define GST_NET_TIME_PROVIDER_GET_PRIVATE(obj) \ (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_NET_TIME_PROVIDER, GstNetTimeProviderPrivate)) struct _GstNetTimeProviderPrivate { gchar *address; int port; GThread *thread; GstClock *clock; gboolean active; /* ATOMIC */ GSocket *socket; GCancellable *cancel; }; static gboolean gst_net_time_provider_start (GstNetTimeProvider * bself); static void gst_net_time_provider_stop (GstNetTimeProvider * bself); static gpointer gst_net_time_provider_thread (gpointer data); static void gst_net_time_provider_finalize (GObject * object); static void gst_net_time_provider_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_net_time_provider_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); #define _do_init \ GST_DEBUG_CATEGORY_INIT (ntp_debug, "nettime", 0, "Network time provider"); #define gst_net_time_provider_parent_class parent_class G_DEFINE_TYPE_WITH_CODE (GstNetTimeProvider, gst_net_time_provider, GST_TYPE_OBJECT, _do_init); static void gst_net_time_provider_class_init (GstNetTimeProviderClass * klass) { GObjectClass *gobject_class; gobject_class = G_OBJECT_CLASS (klass); g_assert (sizeof (GstClockTime) == 8); g_type_class_add_private (klass, sizeof (GstNetTimeProviderPrivate)); gobject_class->finalize = gst_net_time_provider_finalize; gobject_class->set_property = gst_net_time_provider_set_property; gobject_class->get_property = gst_net_time_provider_get_property; g_object_class_install_property (gobject_class, PROP_PORT, g_param_spec_int ("port", "port", "The port to receive the packets from, 0=allocate", 0, G_MAXUINT16, DEFAULT_PORT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_ADDRESS, g_param_spec_string ("address", "address", "The address to bind on, as a dotted quad (x.x.x.x)", DEFAULT_ADDRESS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_CLOCK, g_param_spec_object ("clock", "Clock", "The clock to export over the network", GST_TYPE_CLOCK, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_ACTIVE, g_param_spec_boolean ("active", "Active", "TRUE if the clock will respond to queries over the network", TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); } static void gst_net_time_provider_init (GstNetTimeProvider * self) { self->priv = GST_NET_TIME_PROVIDER_GET_PRIVATE (self); self->priv->port = DEFAULT_PORT; self->priv->address = g_strdup (DEFAULT_ADDRESS); self->priv->thread = NULL; self->priv->active = TRUE; } static void gst_net_time_provider_finalize (GObject * object) { GstNetTimeProvider *self = GST_NET_TIME_PROVIDER (object); if (self->priv->thread) { gst_net_time_provider_stop (self); g_assert (self->priv->thread == NULL); } g_free (self->priv->address); self->priv->address = NULL; if (self->priv->clock) gst_object_unref (self->priv->clock); self->priv->clock = NULL; G_OBJECT_CLASS (parent_class)->finalize (object); } static gpointer gst_net_time_provider_thread (gpointer data) { GstNetTimeProvider *self = data; GCancellable *cancel = self->priv->cancel; GSocket *socket = self->priv->socket; GstNetTimePacket *packet; GError *err = NULL; GST_INFO_OBJECT (self, "time provider thread is running"); while (TRUE) { GSocketAddress *sender_addr = NULL; GST_LOG_OBJECT (self, "waiting on socket"); if (!g_socket_condition_wait (socket, G_IO_IN, cancel, &err)) { GST_INFO_OBJECT (self, "socket error: %s", err->message); if (err->code == G_IO_ERROR_CANCELLED) break; /* try again */ g_usleep (G_USEC_PER_SEC / 10); g_error_free (err); err = NULL; continue; } /* got data in */ packet = gst_net_time_packet_receive (socket, &sender_addr, &err); if (err != NULL) { GST_DEBUG_OBJECT (self, "receive error: %s", err->message); g_usleep (G_USEC_PER_SEC / 10); g_error_free (err); err = NULL; continue; } if (IS_ACTIVE (self)) { /* do what we were asked to and send the packet back */ packet->remote_time = gst_clock_get_time (self->priv->clock); /* ignore errors */ gst_net_time_packet_send (packet, socket, sender_addr, NULL); g_object_unref (sender_addr); g_free (packet); } } g_error_free (err); GST_INFO_OBJECT (self, "time provider thread is stopping"); return NULL; } static void gst_net_time_provider_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstNetTimeProvider *self = GST_NET_TIME_PROVIDER (object); GstClock **clock_p = &self->priv->clock; switch (prop_id) { case PROP_PORT: self->priv->port = g_value_get_int (value); break; case PROP_ADDRESS: g_free (self->priv->address); if (g_value_get_string (value) == NULL) self->priv->address = g_strdup (DEFAULT_ADDRESS); else self->priv->address = g_strdup (g_value_get_string (value)); break; case PROP_CLOCK: gst_object_replace ((GstObject **) clock_p, (GstObject *) g_value_get_object (value)); break; case PROP_ACTIVE: g_atomic_int_set (&self->priv->active, g_value_get_boolean (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_net_time_provider_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstNetTimeProvider *self = GST_NET_TIME_PROVIDER (object); switch (prop_id) { case PROP_PORT: g_value_set_int (value, self->priv->port); break; case PROP_ADDRESS: g_value_set_string (value, self->priv->address); break; case PROP_CLOCK: g_value_set_object (value, self->priv->clock); break; case PROP_ACTIVE: g_value_set_boolean (value, IS_ACTIVE (self)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static gboolean gst_net_time_provider_start (GstNetTimeProvider * self) { GSocketAddress *socket_addr, *bound_addr; GInetAddress *inet_addr; GSocket *socket; GError *err = NULL; int port; gchar *address; if (self->priv->address) { inet_addr = g_inet_address_new_from_string (self->priv->address); if (inet_addr == NULL) goto invalid_address; } else { inet_addr = g_inet_address_new_any (G_SOCKET_FAMILY_IPV4); } GST_LOG_OBJECT (self, "creating socket"); socket = g_socket_new (g_inet_address_get_family (inet_addr), G_SOCKET_TYPE_DATAGRAM, G_SOCKET_PROTOCOL_UDP, &err); if (err != NULL) goto no_socket; GST_DEBUG_OBJECT (self, "binding on port %d", self->priv->port); socket_addr = g_inet_socket_address_new (inet_addr, self->priv->port); g_socket_bind (socket, socket_addr, TRUE, &err); g_object_unref (socket_addr); g_object_unref (inet_addr); if (err != NULL) goto bind_error; bound_addr = g_socket_get_local_address (socket, NULL); port = g_inet_socket_address_get_port (G_INET_SOCKET_ADDRESS (bound_addr)); inet_addr = g_inet_socket_address_get_address (G_INET_SOCKET_ADDRESS (bound_addr)); address = g_inet_address_to_string (inet_addr); if (g_strcmp0 (address, self->priv->address)) { g_free (self->priv->address); self->priv->address = address; GST_DEBUG_OBJECT (self, "notifying address %s", address); g_object_notify (G_OBJECT (self), "address"); } else { g_free (address); } if (port != self->priv->port) { self->priv->port = port; GST_DEBUG_OBJECT (self, "notifying port %d", port); g_object_notify (G_OBJECT (self), "port"); } GST_DEBUG_OBJECT (self, "bound on UDP address %s, port %d", address, port); g_object_unref (bound_addr); self->priv->socket = socket; self->priv->cancel = g_cancellable_new (); self->priv->thread = g_thread_try_new ("GstNetTimeProvider", gst_net_time_provider_thread, self, &err); if (err != NULL) goto no_thread; return TRUE; /* ERRORS */ invalid_address: { GST_ERROR_OBJECT (self, "invalid address: %s", self->priv->address); return FALSE; } no_socket: { GST_ERROR_OBJECT (self, "could not create socket: %s", err->message); g_error_free (err); g_object_unref (inet_addr); return FALSE; } bind_error: { GST_ERROR_OBJECT (self, "bind failed: %s", err->message); g_error_free (err); g_object_unref (socket); return FALSE; } no_thread: { GST_ERROR_OBJECT (self, "could not create thread: %s", err->message); g_error_free (err); g_object_unref (self->priv->socket); self->priv->socket = NULL; g_object_unref (self->priv->cancel); self->priv->cancel = NULL; return FALSE; } } static void gst_net_time_provider_stop (GstNetTimeProvider * self) { g_return_if_fail (self->priv->thread != NULL); GST_INFO_OBJECT (self, "stopping.."); g_cancellable_cancel (self->priv->cancel); g_thread_join (self->priv->thread); self->priv->thread = NULL; g_object_unref (self->priv->cancel); self->priv->cancel = NULL; g_object_unref (self->priv->socket); self->priv->socket = NULL; GST_INFO_OBJECT (self, "stopped"); } /** * gst_net_time_provider_new: * @clock: a #GstClock to export over the network * @address: (allow-none): an address to bind on as a dotted quad * (xxx.xxx.xxx.xxx), IPv6 address, or NULL to bind to all addresses * @port: a port to bind on, or 0 to let the kernel choose * * Allows network clients to get the current time of @clock. * * Returns: the new #GstNetTimeProvider, or NULL on error */ GstNetTimeProvider * gst_net_time_provider_new (GstClock * clock, const gchar * address, gint port) { GstNetTimeProvider *ret; g_return_val_if_fail (clock && GST_IS_CLOCK (clock), NULL); g_return_val_if_fail (port >= 0 && port <= G_MAXUINT16, NULL); ret = g_object_new (GST_TYPE_NET_TIME_PROVIDER, "clock", clock, "address", address, "port", port, NULL); if (!gst_net_time_provider_start (ret)) goto failed_start; /* all systems go, cap'n */ return ret; failed_start: { /* already printed a nice error */ gst_object_unref (ret); return NULL; } }