gstreamer/libs/gst/net/gstnettimeprovider.c

486 lines
13 KiB
C
Raw Normal View History

/* GStreamer
* Copyright (C) 2005 Andy Wingo <wingo@pobox.com>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, 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 numner as arguments.
*
* After creating the object, a client clock such as #GstNetClientClock can
* query the exposed clock 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"
#include <unistd.h>
#include <sys/ioctl.h>
#ifdef HAVE_FIONREAD_IN_SYS_FILIO
#include <sys/filio.h>
#endif
GST_DEBUG_CATEGORY (ntp_debug);
#define GST_CAT_DEFAULT (ntp_debug)
/* the select call is also performed on the control sockets, that way
* we can send special commands to unblock or restart the select call */
#define CONTROL_RESTART 'R' /* restart the select call */
#define CONTROL_STOP 'S' /* stop the select call */
#define CONTROL_SOCKETS(self) self->control_sock
#define WRITE_SOCKET(self) self->control_sock[1]
#define READ_SOCKET(self) self->control_sock[0]
#define SEND_COMMAND(self, command) \
G_STMT_START { \
unsigned char c; c = command; \
write (WRITE_SOCKET(self), &c, 1); \
} G_STMT_END
#define READ_COMMAND(self, command, res) \
G_STMT_START { \
res = read(READ_SOCKET(self), &command, 1); \
} G_STMT_END
#define DEFAULT_ADDRESS "0.0.0.0"
#define DEFAULT_PORT 5637
enum
{
PROP_0,
PROP_PORT,
PROP_ADDRESS,
PROP_CLOCK
/* FILL ME */
};
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(type) \
GST_DEBUG_CATEGORY_INIT (ntp_debug, "nettime", 0, "Network time provider");
GST_BOILERPLATE_FULL (GstNetTimeProvider, gst_net_time_provider, GstObject,
GST_TYPE_OBJECT, _do_init);
static void
gst_net_time_provider_base_init (gpointer g_class)
{
g_assert (sizeof (GstClockTime) == 8);
}
static void
gst_net_time_provider_class_init (GstNetTimeProviderClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
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 (G_OBJECT_CLASS (klass), 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_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_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));
}
static void
gst_net_time_provider_init (GstNetTimeProvider * self,
GstNetTimeProviderClass * g_class)
{
self->port = DEFAULT_PORT;
self->sock = -1;
self->address = g_strdup (DEFAULT_ADDRESS);
self->thread = NULL;
READ_SOCKET (self) = -1;
WRITE_SOCKET (self) = -1;
}
static void
gst_net_time_provider_finalize (GObject * object)
{
GstNetTimeProvider *self = GST_NET_TIME_PROVIDER (object);
if (self->thread) {
gst_net_time_provider_stop (self);
g_assert (self->thread == NULL);
}
if (READ_SOCKET (self) != -1) {
close (READ_SOCKET (self));
close (WRITE_SOCKET (self));
READ_SOCKET (self) = -1;
WRITE_SOCKET (self) = -1;
}
g_free (self->address);
self->address = NULL;
if (self->clock)
gst_object_unref (self->clock);
self->clock = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gpointer
gst_net_time_provider_thread (gpointer data)
{
GstNetTimeProvider *self = data;
struct sockaddr_in tmpaddr;
socklen_t len;
fd_set read_fds;
guint max_sock;
GstNetTimePacket *packet;
gint ret;
while (TRUE) {
FD_ZERO (&read_fds);
FD_SET (self->sock, &read_fds);
FD_SET (READ_SOCKET (self), &read_fds);
max_sock = MAX (self->sock, READ_SOCKET (self));
GST_LOG_OBJECT (self, "doing select");
ret = select (max_sock + 1, &read_fds, NULL, NULL, NULL);
GST_LOG_OBJECT (self, "select returned %d", ret);
if (ret <= 0) {
if (errno != EAGAIN && errno != EINTR)
goto select_error;
else
continue;
} else if (FD_ISSET (READ_SOCKET (self), &read_fds)) {
/* got control message */
while (TRUE) {
gchar command;
int res;
READ_COMMAND (self, command, res);
if (res < 0) {
GST_LOG_OBJECT (self, "no more commands");
break;
}
switch (command) {
case CONTROL_STOP:
/* break out of the select loop */
GST_LOG_OBJECT (self, "stop");
goto stopped;
default:
GST_WARNING_OBJECT (self, "unkown");
g_warning ("nettimeprovider: unknown control message received");
continue;
}
g_assert_not_reached ();
}
continue;
} else {
/* got data in */
len = sizeof (struct sockaddr);
packet = gst_net_time_packet_receive (self->sock,
(struct sockaddr *) &tmpaddr, &len);
if (!packet)
goto receive_error;
/* do what we were asked to and send the packet back */
packet->remote_time = gst_clock_get_time (self->clock);
/* ignore errors */
gst_net_time_packet_send (packet, self->sock,
(struct sockaddr *) &tmpaddr, len);
g_free (packet);
continue;
}
g_assert_not_reached ();
/* log errors and keep going */
select_error:
{
GST_DEBUG_OBJECT (self, "select error %d: %s (%d)", ret,
g_strerror (errno), errno);
continue;
}
stopped:
{
GST_DEBUG_OBJECT (self, "shutting down");
/* close socket */
return NULL;
}
receive_error:
{
GST_DEBUG_OBJECT (self, "receive error");
continue;
}
g_assert_not_reached ();
}
g_assert_not_reached ();
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);
switch (prop_id) {
case PROP_PORT:
self->port = g_value_get_int (value);
break;
case PROP_ADDRESS:
g_free (self->address);
if (g_value_get_string (value) == NULL)
self->address = g_strdup (DEFAULT_ADDRESS);
else
self->address = g_strdup (g_value_get_string (value));
break;
case PROP_CLOCK:
gst_object_replace ((GstObject **) & self->clock,
(GstObject *) g_value_get_object (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->port);
break;
case PROP_ADDRESS:
g_value_set_string (value, self->address);
break;
case PROP_CLOCK:
g_value_set_object (value, self->clock);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_net_time_provider_start (GstNetTimeProvider * self)
{
gint ru;
struct sockaddr_in my_addr;
guint len;
int port;
gint ret;
GError *error;
if ((ret = socket (AF_INET, SOCK_DGRAM, 0)) < 0)
goto no_socket;
self->sock = ret;
ru = 1;
ret = setsockopt (self->sock, SOL_SOCKET, SO_REUSEADDR, &ru, sizeof (ru));
if (ret < 0)
goto setsockopt_error;
memset (&my_addr, 0, sizeof (my_addr));
my_addr.sin_family = AF_INET; /* host byte order */
my_addr.sin_port = htons ((gint16) self->port); /* short, network byte order */
my_addr.sin_addr.s_addr = INADDR_ANY;
if (self->address)
inet_aton (self->address, &my_addr.sin_addr);
GST_DEBUG_OBJECT (self, "binding on port %d", self->port);
ret = bind (self->sock, (struct sockaddr *) &my_addr, sizeof (my_addr));
if (ret < 0)
goto bind_error;
len = sizeof (my_addr);
ret = getsockname (self->sock, (struct sockaddr *) &my_addr, &len);
if (ret < 0)
goto getsockname_error;
port = ntohs (my_addr.sin_port);
GST_DEBUG_OBJECT (self, "bound, on port %d", port);
if (port != self->port) {
self->port = port;
GST_DEBUG_OBJECT (self, "notifying %d", port);
g_object_notify (G_OBJECT (self), "port");
}
self->thread = g_thread_create (gst_net_time_provider_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;
}
setsockopt_error:
{
close (self->sock);
self->sock = -1;
GST_ERROR_OBJECT (self, "setsockopt failed %d: %s (%d)", ret,
g_strerror (errno), errno);
return FALSE;
}
bind_error:
{
close (self->sock);
self->sock = -1;
GST_ERROR_OBJECT (self, "bind failed %d: %s (%d)", ret,
g_strerror (errno), errno);
return FALSE;
}
getsockname_error:
{
close (self->sock);
self->sock = -1;
GST_ERROR_OBJECT (self, "getsockname failed %d: %s (%d)", ret,
g_strerror (errno), errno);
return FALSE;
}
no_thread:
{
close (self->sock);
self->sock = -1;
GST_ERROR_OBJECT (self, "could not create thread: %s", error->message);
g_error_free (error);
return FALSE;
}
}
static void
gst_net_time_provider_stop (GstNetTimeProvider * 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_time_provider_new:
* @clock: a #GstClock to export over the network
* @address: an address to bind on as a dotted quad (xxx.xxx.xxx.xxx), or NULL
* to bind to all addresses
* @port: a port to bind on, or -1 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;
gint iret;
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);
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_time_provider_start (ret))
goto failed_start;
/* all systems go, cap'n */
return 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;
}
}