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d8bdba3102
address is only used temporarily. Use the proper variable instead. CID #1212189
429 lines
12 KiB
C
429 lines
12 KiB
C
/* GStreamer
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* Copyright (C) 2005 Andy Wingo <wingo@pobox.com>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:gstnettimeprovider
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* @short_description: Special object that exposed the time of a clock
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* on the network.
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* @see_also: #GstClock, #GstNetClientClock, #GstPipeline
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*
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* This object exposes the time of a #GstClock on the network.
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*
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* A #GstNetTimeProvider is created with gst_net_time_provider_new() which
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* takes a #GstClock, an address and a port number as arguments.
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*
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* After creating the object, a client clock such as #GstNetClientClock can
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* query the exposed clock over the network for its values.
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*
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* The #GstNetTimeProvider typically wraps the clock used by a #GstPipeline.
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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 "gstnettimeprovider.h"
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#include "gstnettimepacket.h"
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GST_DEBUG_CATEGORY_STATIC (ntp_debug);
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#define GST_CAT_DEFAULT (ntp_debug)
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#define DEFAULT_ADDRESS "0.0.0.0"
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#define DEFAULT_PORT 5637
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#define IS_ACTIVE(self) (g_atomic_int_get (&((self)->priv->active)))
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enum
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{
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PROP_0,
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PROP_PORT,
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PROP_ADDRESS,
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PROP_CLOCK,
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PROP_ACTIVE
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};
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#define GST_NET_TIME_PROVIDER_GET_PRIVATE(obj) \
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(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_NET_TIME_PROVIDER, GstNetTimeProviderPrivate))
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struct _GstNetTimeProviderPrivate
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{
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gchar *address;
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int port;
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GThread *thread;
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GstClock *clock;
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gboolean active; /* ATOMIC */
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GSocket *socket;
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GCancellable *cancel;
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};
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static gboolean gst_net_time_provider_start (GstNetTimeProvider * bself);
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static void gst_net_time_provider_stop (GstNetTimeProvider * bself);
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static gpointer gst_net_time_provider_thread (gpointer data);
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static void gst_net_time_provider_finalize (GObject * object);
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static void gst_net_time_provider_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_net_time_provider_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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#define _do_init \
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GST_DEBUG_CATEGORY_INIT (ntp_debug, "nettime", 0, "Network time provider");
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#define gst_net_time_provider_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstNetTimeProvider, gst_net_time_provider,
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GST_TYPE_OBJECT, _do_init);
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static void
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gst_net_time_provider_class_init (GstNetTimeProviderClass * 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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g_assert (sizeof (GstClockTime) == 8);
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g_type_class_add_private (klass, sizeof (GstNetTimeProviderPrivate));
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gobject_class->finalize = gst_net_time_provider_finalize;
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gobject_class->set_property = gst_net_time_provider_set_property;
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gobject_class->get_property = gst_net_time_provider_get_property;
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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 to receive the packets from, 0=allocate", 0, G_MAXUINT16,
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DEFAULT_PORT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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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 to bind on, as a dotted quad (x.x.x.x)",
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DEFAULT_ADDRESS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_CLOCK,
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g_param_spec_object ("clock", "Clock",
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"The clock to export over the network", GST_TYPE_CLOCK,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_ACTIVE,
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g_param_spec_boolean ("active", "Active",
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"TRUE if the clock will respond to queries over the network", TRUE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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}
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static void
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gst_net_time_provider_init (GstNetTimeProvider * self)
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{
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self->priv = GST_NET_TIME_PROVIDER_GET_PRIVATE (self);
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self->priv->port = DEFAULT_PORT;
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self->priv->address = g_strdup (DEFAULT_ADDRESS);
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self->priv->thread = NULL;
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self->priv->active = TRUE;
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}
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static void
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gst_net_time_provider_finalize (GObject * object)
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{
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GstNetTimeProvider *self = GST_NET_TIME_PROVIDER (object);
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if (self->priv->thread) {
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gst_net_time_provider_stop (self);
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g_assert (self->priv->thread == NULL);
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}
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g_free (self->priv->address);
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self->priv->address = NULL;
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if (self->priv->clock)
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gst_object_unref (self->priv->clock);
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self->priv->clock = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static gpointer
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gst_net_time_provider_thread (gpointer data)
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{
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GstNetTimeProvider *self = data;
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GCancellable *cancel = self->priv->cancel;
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GSocket *socket = self->priv->socket;
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GstNetTimePacket *packet;
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GError *err = NULL;
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GST_INFO_OBJECT (self, "time provider thread is running");
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while (TRUE) {
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GSocketAddress *sender_addr = NULL;
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GST_LOG_OBJECT (self, "waiting on socket");
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if (!g_socket_condition_wait (socket, G_IO_IN, cancel, &err)) {
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GST_INFO_OBJECT (self, "socket error: %s", err->message);
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if (err->code == G_IO_ERROR_CANCELLED)
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break;
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/* try again */
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g_usleep (G_USEC_PER_SEC / 10);
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g_error_free (err);
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err = NULL;
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continue;
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}
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/* got data in */
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packet = gst_net_time_packet_receive (socket, &sender_addr, &err);
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if (err != NULL) {
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GST_DEBUG_OBJECT (self, "receive error: %s", err->message);
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g_usleep (G_USEC_PER_SEC / 10);
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g_error_free (err);
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err = NULL;
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continue;
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}
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if (IS_ACTIVE (self)) {
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/* do what we were asked to and send the packet back */
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packet->remote_time = gst_clock_get_time (self->priv->clock);
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/* ignore errors */
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gst_net_time_packet_send (packet, socket, sender_addr, NULL);
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g_object_unref (sender_addr);
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g_free (packet);
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}
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}
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if (err != NULL)
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g_error_free (err);
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GST_INFO_OBJECT (self, "time provider thread is stopping");
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return NULL;
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}
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static void
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gst_net_time_provider_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstNetTimeProvider *self = GST_NET_TIME_PROVIDER (object);
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GstClock **clock_p = &self->priv->clock;
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switch (prop_id) {
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case PROP_PORT:
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self->priv->port = g_value_get_int (value);
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break;
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case PROP_ADDRESS:
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g_free (self->priv->address);
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if (g_value_get_string (value) == NULL)
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self->priv->address = g_strdup (DEFAULT_ADDRESS);
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else
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self->priv->address = g_strdup (g_value_get_string (value));
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break;
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case PROP_CLOCK:
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gst_object_replace ((GstObject **) clock_p,
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(GstObject *) g_value_get_object (value));
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break;
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case PROP_ACTIVE:
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g_atomic_int_set (&self->priv->active, g_value_get_boolean (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_time_provider_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstNetTimeProvider *self = GST_NET_TIME_PROVIDER (object);
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switch (prop_id) {
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case PROP_PORT:
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g_value_set_int (value, self->priv->port);
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break;
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case PROP_ADDRESS:
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g_value_set_string (value, self->priv->address);
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break;
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case PROP_CLOCK:
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g_value_set_object (value, self->priv->clock);
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break;
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case PROP_ACTIVE:
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g_value_set_boolean (value, IS_ACTIVE (self));
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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 gboolean
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gst_net_time_provider_start (GstNetTimeProvider * self)
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{
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GSocketAddress *socket_addr, *bound_addr;
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GInetAddress *inet_addr;
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GSocket *socket;
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GError *err = NULL;
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int port;
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gchar *address;
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if (self->priv->address) {
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inet_addr = g_inet_address_new_from_string (self->priv->address);
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if (inet_addr == NULL)
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goto invalid_address;
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} else {
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inet_addr = g_inet_address_new_any (G_SOCKET_FAMILY_IPV4);
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}
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GST_LOG_OBJECT (self, "creating socket");
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socket = g_socket_new (g_inet_address_get_family (inet_addr),
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G_SOCKET_TYPE_DATAGRAM, G_SOCKET_PROTOCOL_UDP, &err);
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if (err != NULL)
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goto no_socket;
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GST_DEBUG_OBJECT (self, "binding on port %d", self->priv->port);
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socket_addr = g_inet_socket_address_new (inet_addr, self->priv->port);
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g_socket_bind (socket, socket_addr, TRUE, &err);
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g_object_unref (socket_addr);
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g_object_unref (inet_addr);
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if (err != NULL)
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goto bind_error;
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bound_addr = g_socket_get_local_address (socket, NULL);
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port = g_inet_socket_address_get_port (G_INET_SOCKET_ADDRESS (bound_addr));
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inet_addr =
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g_inet_socket_address_get_address (G_INET_SOCKET_ADDRESS (bound_addr));
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address = g_inet_address_to_string (inet_addr);
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if (g_strcmp0 (address, self->priv->address)) {
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g_free (self->priv->address);
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self->priv->address = address;
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GST_DEBUG_OBJECT (self, "notifying address %s", address);
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g_object_notify (G_OBJECT (self), "address");
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} else {
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g_free (address);
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}
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if (port != self->priv->port) {
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self->priv->port = port;
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GST_DEBUG_OBJECT (self, "notifying port %d", port);
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g_object_notify (G_OBJECT (self), "port");
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}
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GST_DEBUG_OBJECT (self, "bound on UDP address %s, port %d",
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self->priv->address, port);
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g_object_unref (bound_addr);
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self->priv->socket = socket;
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self->priv->cancel = g_cancellable_new ();
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self->priv->thread = g_thread_try_new ("GstNetTimeProvider",
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gst_net_time_provider_thread, self, &err);
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if (err != NULL)
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goto no_thread;
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return TRUE;
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/* ERRORS */
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invalid_address:
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{
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GST_ERROR_OBJECT (self, "invalid address: %s", self->priv->address);
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return FALSE;
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}
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no_socket:
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{
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GST_ERROR_OBJECT (self, "could not create socket: %s", err->message);
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g_error_free (err);
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g_object_unref (inet_addr);
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return FALSE;
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}
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bind_error:
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{
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GST_ERROR_OBJECT (self, "bind failed: %s", err->message);
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g_error_free (err);
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g_object_unref (socket);
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return FALSE;
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}
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no_thread:
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{
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GST_ERROR_OBJECT (self, "could not create thread: %s", err->message);
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g_error_free (err);
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g_object_unref (self->priv->socket);
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self->priv->socket = NULL;
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g_object_unref (self->priv->cancel);
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self->priv->cancel = NULL;
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return FALSE;
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}
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}
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static void
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gst_net_time_provider_stop (GstNetTimeProvider * self)
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{
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g_return_if_fail (self->priv->thread != NULL);
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GST_INFO_OBJECT (self, "stopping..");
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g_cancellable_cancel (self->priv->cancel);
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g_thread_join (self->priv->thread);
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self->priv->thread = NULL;
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g_object_unref (self->priv->cancel);
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self->priv->cancel = NULL;
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g_object_unref (self->priv->socket);
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self->priv->socket = NULL;
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GST_INFO_OBJECT (self, "stopped");
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}
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/**
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* gst_net_time_provider_new:
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* @clock: a #GstClock to export over the network
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* @address: (allow-none): an address to bind on as a dotted quad
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* (xxx.xxx.xxx.xxx), IPv6 address, or NULL to bind to all addresses
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* @port: a port to bind on, or 0 to let the kernel choose
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*
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* Allows network clients to get the current time of @clock.
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*
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* Returns: the new #GstNetTimeProvider, or NULL on error
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*/
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GstNetTimeProvider *
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gst_net_time_provider_new (GstClock * clock, const gchar * address, gint port)
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{
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GstNetTimeProvider *ret;
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g_return_val_if_fail (clock && GST_IS_CLOCK (clock), NULL);
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g_return_val_if_fail (port >= 0 && port <= G_MAXUINT16, NULL);
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ret = g_object_new (GST_TYPE_NET_TIME_PROVIDER, "clock", clock, "address",
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address, "port", port, NULL);
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if (!gst_net_time_provider_start (ret))
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goto failed_start;
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/* all systems go, cap'n */
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return ret;
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failed_start:
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{
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/* already printed a nice error */
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gst_object_unref (ret);
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return NULL;
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}
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}
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