1 /*****************************************************************************
\r
2 * netsync.c: synchronisation between several network clients.
\r
3 *****************************************************************************
\r
4 * Copyright (C) 2004 VideoLAN
\r
7 * Authors: Gildas Bazin <gbazin@videolan.org>
\r
9 * This program is free software; you can redistribute it and/or modify
\r
10 * it under the terms of the GNU General Public License as published by
\r
11 * the Free Software Foundation; either version 2 of the License, or
\r
12 * (at your option) any later version.
\r
14 * This program is distributed in the hope that it will be useful,
\r
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
\r
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\r
17 * GNU General Public License for more details.
\r
19 * You should have received a copy of the GNU General Public License
\r
20 * along with this program; if not, write to the Free Software
\r
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
\r
22 *****************************************************************************/
\r
24 /*****************************************************************************
\r
26 *****************************************************************************/
\r
28 #include <vlc/vlc.h>
\r
29 #include <vlc/intf.h>
\r
31 #ifdef HAVE_UNISTD_H
\r
32 # include <unistd.h>
\r
35 #ifdef HAVE_SYS_TIME_H
\r
36 # include <sys/time.h>
\r
38 #include <sys/types.h>
\r
41 # include <winsock2.h>
\r
42 # include <ws2tcpip.h>
\r
43 # ifndef IN_MULTICAST
\r
44 # define IN_MULTICAST(a) IN_CLASSD(a)
\r
47 # include <sys/socket.h>
\r
48 # include <netinet/in.h>
\r
49 # if HAVE_ARPA_INET_H
\r
50 # include <arpa/inet.h>
\r
51 # elif defined( SYS_BEOS )
\r
52 # include <net/netdb.h>
\r
57 # define close(a) CloseHandle(a);
\r
58 #elif defined( WIN32 )
\r
59 # define close(a) closesocket(a);
\r
62 #include "network.h"
\r
63 #include "input_ext-plugins.h"
\r
65 #define NETSYNC_PORT_MASTER 9875
\r
66 #define NETSYNC_PORT_SLAVE 9876
\r
68 /*****************************************************************************
\r
70 *****************************************************************************/
\r
71 static int Activate( vlc_object_t * );
\r
72 static void Close ( vlc_object_t * );
\r
74 static mtime_t GetClockRef( intf_thread_t *, mtime_t );
\r
76 #define NETSYNC_TEXT N_( "Act as master for network synchronisation" )
\r
77 #define NETSYNC_LONGTEXT N_( "Allows you to specify if this client should " \
\r
78 "act as the master client for the network synchronisation." )
\r
80 #define MIP_TEXT N_( "Master client ip address" )
\r
81 #define MIP_LONGTEXT N_( "Allows you to specify the ip address of " \
\r
82 "the master client used for the network synchronisation." )
\r
85 set_description( _("Network synchronisation") );
\r
87 add_bool( "netsync-master", 0, NULL,
\r
88 NETSYNC_TEXT, NETSYNC_LONGTEXT, VLC_TRUE );
\r
89 add_string( "netsync-master-ip", NULL, NULL, MIP_TEXT, MIP_LONGTEXT,
\r
92 set_capability( "interface", 0 );
\r
93 set_callbacks( Activate, Close );
\r
98 input_thread_t *p_input;
\r
101 /*****************************************************************************
\r
103 *****************************************************************************/
\r
104 static void Run( intf_thread_t *p_intf );
\r
106 /*****************************************************************************
\r
107 * Activate: initialize and create stuff
\r
108 *****************************************************************************/
\r
109 static int Activate( vlc_object_t *p_this )
\r
111 intf_thread_t *p_intf = (intf_thread_t*)p_this;
\r
113 msg_Info( p_intf, "Using the netsync interface module..." );
\r
115 p_intf->p_sys = malloc( sizeof( intf_sys_t ) );
\r
116 if( !p_intf->p_sys )
\r
118 msg_Err( p_intf, "no memory" );
\r
122 p_intf->p_sys->p_input = NULL;
\r
124 p_intf->pf_run = Run;
\r
125 return VLC_SUCCESS;
\r
128 /*****************************************************************************
\r
129 * Close: destroy interface
\r
130 *****************************************************************************/
\r
131 void Close( vlc_object_t *p_this )
\r
133 intf_thread_t *p_intf = (intf_thread_t*)p_this;
\r
135 free( p_intf->p_sys );
\r
138 /*****************************************************************************
\r
139 * Run: interface thread
\r
140 *****************************************************************************/
\r
141 static void Run( intf_thread_t *p_intf )
\r
143 #define MAX_MSG_LENGTH (2 * sizeof(int64_t))
\r
145 vlc_bool_t b_master = config_GetInt( p_intf, "netsync-master" );
\r
146 char *psz_master = config_GetPsz( p_intf, "netsync-master-ip" );
\r
147 struct sockaddr_in master_addr;
\r
148 char p_data[MAX_MSG_LENGTH];
\r
151 if( !b_master && (!psz_master || inet_addr( psz_master ) == INADDR_NONE) )
\r
153 if( psz_master ) free( psz_master );
\r
154 msg_Err( p_intf, "invalid master address." );
\r
158 memset( &master_addr, 0, sizeof( struct sockaddr_in ) );
\r
159 master_addr.sin_family = AF_INET;
\r
160 master_addr.sin_port = htons( (uint16_t)NETSYNC_PORT_MASTER );
\r
161 master_addr.sin_addr.s_addr = inet_addr( psz_master );
\r
162 free( psz_master );
\r
164 i_socket = net_OpenUDP( p_intf, NULL, b_master ? NETSYNC_PORT_MASTER :
\r
165 NETSYNC_PORT_SLAVE, NULL, 0 );
\r
168 msg_Err( p_intf, "failed opening UDP socket." );
\r
172 /* High priority thread */
\r
173 vlc_thread_set_priority( p_intf, VLC_THREAD_PRIORITY_INPUT );
\r
175 while( !p_intf->b_die )
\r
177 struct timeval timeout;
\r
180 /* Update the input */
\r
181 if( p_intf->p_sys->p_input == NULL )
\r
183 p_intf->p_sys->p_input =
\r
184 (input_thread_t *)vlc_object_find( p_intf, VLC_OBJECT_INPUT,
\r
187 else if( p_intf->p_sys->p_input->b_dead )
\r
189 vlc_object_release( p_intf->p_sys->p_input );
\r
190 p_intf->p_sys->p_input = NULL;
\r
193 if( p_intf->p_sys->p_input == NULL )
\r
196 msleep( INTF_IDLE_SLEEP );
\r
201 * We now have an input
\r
204 /* Initialize file descriptor set and timeout (0.5s) */
\r
206 FD_SET( i_socket, &fds_r );
\r
207 timeout.tv_sec = 0;
\r
208 timeout.tv_usec = 500000;
\r
212 struct sockaddr_in from;
\r
213 mtime_t i_date, i_clockref, i_master_clockref;
\r
214 int i_struct_size, i_read, i_ret;
\r
217 i_ret = select( i_socket + 1, &fds_r, 0, 0, &timeout );
\r
218 if( i_ret == 0 ) continue;
\r
222 msleep( INTF_IDLE_SLEEP );
\r
226 /* We received something */
\r
227 i_struct_size = sizeof(struct sockaddr_in);
\r
228 i_read = recvfrom( i_socket, p_data, MAX_MSG_LENGTH, 0,
\r
229 (struct sockaddr*)&from, &i_struct_size );
\r
231 from.sin_port = htons( (uint16_t)NETSYNC_PORT_SLAVE );
\r
233 i_clockref = ntoh64(*(int64_t *)p_data);
\r
236 *(int64_t *)p_data = hton64( i_date );
\r
238 i_master_clockref = GetClockRef( p_intf, i_clockref );
\r
239 *(((int64_t *)p_data)+1) = hton64( i_master_clockref );
\r
241 /* Reply to the sender */
\r
242 sendto( i_socket, p_data, 2 * sizeof(int64_t), 0,
\r
243 (struct sockaddr *)&from, sizeof(struct sockaddr_in) );
\r
245 msg_Dbg( p_intf, "Master clockref: "I64Fd" -> "I64Fd", from %s "
\r
246 "(date: "I64Fd")", i_clockref, i_master_clockref,
\r
247 inet_ntoa(from.sin_addr), i_date );
\r
251 mtime_t i_send_date, i_receive_date, i_master_date, i_diff_date;
\r
252 mtime_t i_master_clockref, i_client_clockref, i_drift;
\r
253 mtime_t i_clockref = 0;
\r
254 int i_sent, i_read, i_ret;
\r
256 /* Send clock request to the master */
\r
257 *(int64_t *)p_data = hton64( i_clockref );
\r
258 i_send_date = mdate();
\r
260 i_sent = sendto( i_socket, p_data, sizeof(int64_t), 0,
\r
261 (struct sockaddr *)&master_addr,
\r
262 sizeof(struct sockaddr_in) );
\r
266 msleep( INTF_IDLE_SLEEP );
\r
271 i_ret = select(i_socket + 1, &fds_r, 0, 0, &timeout);
\r
272 if( i_ret == 0 ) continue;
\r
276 msleep( INTF_IDLE_SLEEP );
\r
280 i_receive_date = mdate();
\r
282 i_read = recv( i_socket, p_data, MAX_MSG_LENGTH, 0 );
\r
286 msleep( INTF_IDLE_SLEEP );
\r
290 i_master_date = ntoh64(*(int64_t *)p_data);
\r
291 i_master_clockref = ntoh64(*(((int64_t *)p_data)+1));
\r
293 i_diff_date = i_receive_date -
\r
294 ((i_receive_date - i_send_date) / 2 + i_master_date);
\r
296 i_client_clockref = i_drift = 0;
\r
297 if( p_intf->p_sys->p_input && i_master_clockref )
\r
299 i_client_clockref = GetClockRef( p_intf, i_clockref );
\r
300 i_drift = i_client_clockref - i_master_clockref - i_diff_date;
\r
302 /* Update our clock to match the master's one */
\r
303 if( i_client_clockref )
\r
304 p_intf->p_sys->p_input->i_pts_delay -= i_drift;
\r
307 msg_Dbg( p_intf, "Slave clockref: "I64Fd" -> "I64Fd" -> "I64Fd", "
\r
308 "clock diff: "I64Fd" drift: "I64Fd,
\r
309 i_clockref, i_master_clockref,
\r
310 i_client_clockref, i_diff_date, i_drift );
\r
313 msleep( INTF_IDLE_SLEEP );
\r
317 if( p_intf->p_sys->p_input ) vlc_object_release( p_intf->p_sys->p_input );
\r
318 net_Close( i_socket );
\r
321 static mtime_t GetClockRef( intf_thread_t *p_intf, mtime_t i_pts )
\r
323 input_thread_t *p_input = p_intf->p_sys->p_input;
\r
324 pgrm_descriptor_t *p_pgrm;
\r
326 if( !p_input ) return 0;
\r
328 p_pgrm = p_input->stream.p_selected_program;
\r
329 if( p_pgrm ) return input_ClockGetTS( p_input, p_pgrm, i_pts );
\r