Commit 9ccc7235 authored by Gildas Bazin's avatar Gildas Bazin

* modules/control/netsync.c: Experimental network synchronisation module.

parent 9a426b4b
......@@ -883,7 +883,7 @@ test "${enable_cprof}" != "yes" && enable_cprof="no"
dnl
dnl default modules
dnl
AX_ADD_PLUGINS([dummy rc telnet logger gestures memcpy hotkeys])
AX_ADD_PLUGINS([dummy rc telnet logger gestures memcpy hotkeys netsync])
AX_ADD_PLUGINS([mpgv mpga m4v h264 mpeg_system ps ps2 pva ts avi asf aac mp4 rawdv demux2 nsv real aiff mjpeg])
AX_ADD_PLUGINS([cvdsub svcdsub spudec dvbsub mpeg_audio lpcm a52 dts cinepak])
AX_ADD_PLUGINS([deinterlace invert adjust wall transform distort clone crop motionblur])
......
SOURCES_gestures = gestures.c
SOURCES_http = http.c
SOURCES_telnet = telnet.c
SOURCES_netsync = netsync.c
SOURCES_ntservice = ntservice.c
SOURCES_joystick = joystick.c
SOURCES_hotkeys = hotkeys.c
......
/*****************************************************************************
* netsync.c: synchronisation between several network clients.
*****************************************************************************
* Copyright (C) 2004 VideoLAN
* $Id: ntservice.c 6963 2004-03-05 19:24:14Z murray $
*
* Authors: Gildas Bazin <gbazin@videolan.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <stdlib.h>
#include <vlc/vlc.h>
#include <vlc/intf.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#include <sys/types.h>
#ifdef WIN32
# include <winsock2.h>
# include <ws2tcpip.h>
# ifndef IN_MULTICAST
# define IN_MULTICAST(a) IN_CLASSD(a)
# endif
#else
# include <sys/socket.h>
# include <netinet/in.h>
# if HAVE_ARPA_INET_H
# include <arpa/inet.h>
# elif defined( SYS_BEOS )
# include <net/netdb.h>
# endif
#endif
#ifdef UNDER_CE
# define close(a) CloseHandle(a);
#elif defined( WIN32 )
# define close(a) closesocket(a);
#endif
#include "network.h"
#include "input_ext-plugins.h"
#define NETSYNC_PORT_MASTER 9875
#define NETSYNC_PORT_SLAVE 9876
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Activate( vlc_object_t * );
static void Close ( vlc_object_t * );
static mtime_t GetClockRef( intf_thread_t *, mtime_t );
#define NETSYNC_TEXT N_( "Act as master for network synchronisation" )
#define NETSYNC_LONGTEXT N_( "Allows you to specify if this client should " \
"act as the master client for the network synchronisation." )
#define MIP_TEXT N_( "Master client ip address" )
#define MIP_LONGTEXT N_( "Allows you to specify the ip address of " \
"the master client used for the network synchronisation." )
vlc_module_begin();
set_description( _("Network synchronisation") );
add_bool( "netsync-master", 0, NULL,
NETSYNC_TEXT, NETSYNC_LONGTEXT, VLC_TRUE );
add_string( "netsync-master-ip", NULL, NULL, MIP_TEXT, MIP_LONGTEXT,
VLC_TRUE );
set_capability( "interface", 0 );
set_callbacks( Activate, Close );
vlc_module_end();
struct intf_sys_t
{
input_thread_t *p_input;
};
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static void Run( intf_thread_t *p_intf );
/*****************************************************************************
* Activate: initialize and create stuff
*****************************************************************************/
static int Activate( vlc_object_t *p_this )
{
intf_thread_t *p_intf = (intf_thread_t*)p_this;
msg_Info( p_intf, "Using the netsync interface module..." );
p_intf->p_sys = malloc( sizeof( intf_sys_t ) );
p_intf->pf_run = Run;
return VLC_SUCCESS;
}
/*****************************************************************************
* Close: destroy interface
*****************************************************************************/
void Close( vlc_object_t *p_this )
{
intf_thread_t *p_intf = (intf_thread_t*)p_this;
free( p_intf->p_sys );
}
/*****************************************************************************
* Run: interface thread
*****************************************************************************/
static void Run( intf_thread_t *p_intf )
{
#define MAX_MSG_LENGTH (2 * sizeof(int64_t))
vlc_bool_t b_master = config_GetInt( p_intf, "netsync-master" );
char *psz_master = config_GetPsz( p_intf, "netsync-master-ip" );
struct sockaddr_in master_addr;
char p_data[MAX_MSG_LENGTH];
int i_socket;
if( !psz_master || inet_addr( psz_master ) == INADDR_NONE )
{
if( psz_master ) free( psz_master );
msg_Err( p_intf, "invalid master address." );
return;
}
memset( &master_addr, 0, sizeof( struct sockaddr_in ) );
master_addr.sin_family = AF_INET;
master_addr.sin_port = htons( (uint16_t)NETSYNC_PORT_MASTER );
master_addr.sin_addr.s_addr = inet_addr( psz_master );
free( psz_master );
i_socket = net_OpenUDP( p_intf, NULL, b_master ? NETSYNC_PORT_MASTER :
NETSYNC_PORT_SLAVE, NULL, 0 );
if( i_socket < 0 )
{
msg_Err( p_intf, "failed opening UDP socket." );
return;
}
/* High priority thread */
vlc_thread_set_priority( p_intf, VLC_THREAD_PRIORITY_INPUT );
while( !p_intf->b_die )
{
struct timeval timeout;
fd_set fds_r;
/* Update the input */
if( p_intf->p_sys->p_input == NULL )
{
p_intf->p_sys->p_input =
(input_thread_t *)vlc_object_find( p_intf, VLC_OBJECT_INPUT,
FIND_ANYWHERE );
}
else if( p_intf->p_sys->p_input->b_dead )
{
vlc_object_release( p_intf->p_sys->p_input );
p_intf->p_sys->p_input = NULL;
}
if( p_intf->p_sys->p_input == NULL )
{
/* Wait a bit */
msleep( INTF_IDLE_SLEEP );
continue;
}
/*
* We now have an input
*/
/* Initialize file descriptor set and timeout (0.5s) */
FD_ZERO( &fds_r );
FD_SET( i_socket, &fds_r );
timeout.tv_sec = 0;
timeout.tv_usec = 500000;
if( b_master )
{
struct sockaddr_in from;
mtime_t i_date, i_clockref, i_master_clockref;
int i_struct_size, i_read, i_ret;
/* Don't block */
i_ret = select( i_socket + 1, &fds_r, 0, 0, &timeout );
if( i_ret == 0 ) continue;
if( i_ret < 0 )
{
/* Wait a bit */
msleep( INTF_IDLE_SLEEP );
continue;
}
/* We received something */
i_struct_size = sizeof(struct sockaddr_in);
i_read = recvfrom( i_socket, p_data, MAX_MSG_LENGTH, 0,
(struct sockaddr*)&from, &i_struct_size );
from.sin_port = htons( (uint16_t)NETSYNC_PORT_SLAVE );
i_clockref = ntoh64(*(int64_t *)p_data);
i_date = mdate();
*(int64_t *)p_data = hton64( i_date );
i_master_clockref = GetClockRef( p_intf, i_clockref );
*(((int64_t *)p_data)+1) = hton64( i_master_clockref );
/* Reply to the sender */
sendto( i_socket, p_data, 2 * sizeof(int64_t), 0,
(struct sockaddr *)&from, sizeof(struct sockaddr_in) );
msg_Dbg( p_intf, "Master clockref: "I64Fd" -> "I64Fd", from %s "
"(date: "I64Fd")", i_clockref, i_master_clockref,
inet_ntoa(from.sin_addr), i_date );
}
else
{
mtime_t i_send_date, i_receive_date, i_master_date, i_diff_date;
mtime_t i_master_clockref, i_client_clockref, i_drift;
mtime_t i_clockref = 0;
int i_sent, i_read, i_ret;
/* Send clock request to the master */
*(int64_t *)p_data = hton64( i_clockref );
i_send_date = mdate();
i_sent = sendto( i_socket, p_data, sizeof(int64_t), 0,
(struct sockaddr *)&master_addr,
sizeof(struct sockaddr_in) );
if( i_sent <= 0 )
{
/* Wait a bit */
msleep( INTF_IDLE_SLEEP );
continue;
}
/* Don't block */
i_ret = select(i_socket + 1, &fds_r, 0, 0, &timeout);
if( i_ret == 0 ) continue;
if( i_ret < 0 )
{
/* Wait a bit */
msleep( INTF_IDLE_SLEEP );
continue;
}
i_receive_date = mdate();
i_read = recv( i_socket, p_data, MAX_MSG_LENGTH, 0 );
if( i_read <= 0 )
{
/* Wait a bit */
msleep( INTF_IDLE_SLEEP );
continue;
}
i_master_date = ntoh64(*(int64_t *)p_data);
i_master_clockref = ntoh64(*(((int64_t *)p_data)+1));
i_diff_date = i_receive_date -
((i_receive_date - i_send_date) / 2 + i_master_date);
i_client_clockref = i_drift = 0;
if( p_intf->p_sys->p_input && i_master_clockref )
{
i_client_clockref = GetClockRef( p_intf, i_clockref );
i_drift = i_client_clockref - i_master_clockref - i_diff_date;
/* Update our clock to match the master's one */
if( i_client_clockref )
p_intf->p_sys->p_input->i_pts_delay -= i_drift;
}
msg_Dbg( p_intf, "Slave clockref: "I64Fd" -> "I64Fd" -> "I64Fd", "
"clock diff: "I64Fd" drift: "I64Fd,
i_clockref, i_master_clockref,
i_client_clockref, i_diff_date, i_drift );
/* Wait a bit */
msleep( INTF_IDLE_SLEEP );
}
}
if( p_intf->p_sys->p_input ) vlc_object_release( p_intf->p_sys->p_input );
net_Close( i_socket );
}
static mtime_t GetClockRef( intf_thread_t *p_intf, mtime_t i_pts )
{
input_thread_t *p_input = p_intf->p_sys->p_input;
pgrm_descriptor_t *p_pgrm;
if( !p_input ) return 0;
p_pgrm = p_input->stream.p_selected_program;
if( p_pgrm ) return input_ClockGetTS( p_input, p_pgrm, i_pts );
return 0;
}
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