--- /dev/null
+/*****************************************************************************\r
+ * netsync.c: synchronisation between several network clients.\r
+ *****************************************************************************\r
+ * Copyright (C) 2004 VideoLAN\r
+ * $Id: ntservice.c 6963 2004-03-05 19:24:14Z murray $\r
+ *\r
+ * Authors: Gildas Bazin <gbazin@videolan.org>\r
+ *\r
+ * This program is free software; you can redistribute it and/or modify\r
+ * it under the terms of the GNU General Public License as published by\r
+ * the Free Software Foundation; either version 2 of the License, or\r
+ * (at your option) any later version.\r
+ *\r
+ * This program is distributed in the hope that it will be useful,\r
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r
+ * GNU General Public License for more details.\r
+ *\r
+ * You should have received a copy of the GNU General Public License\r
+ * along with this program; if not, write to the Free Software\r
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.\r
+ *****************************************************************************/\r
+\r
+/*****************************************************************************\r
+ * Preamble\r
+ *****************************************************************************/\r
+#include <stdlib.h>\r
+#include <vlc/vlc.h>\r
+#include <vlc/intf.h>\r
+\r
+#ifdef HAVE_UNISTD_H\r
+# include <unistd.h>\r
+#endif\r
+\r
+#ifdef HAVE_SYS_TIME_H\r
+# include <sys/time.h>\r
+#endif\r
+#include <sys/types.h>\r
+\r
+#ifdef WIN32\r
+# include <winsock2.h>\r
+# include <ws2tcpip.h>\r
+# ifndef IN_MULTICAST\r
+# define IN_MULTICAST(a) IN_CLASSD(a)\r
+# endif\r
+#else\r
+# include <sys/socket.h>\r
+# include <netinet/in.h>\r
+# if HAVE_ARPA_INET_H\r
+# include <arpa/inet.h>\r
+# elif defined( SYS_BEOS )\r
+# include <net/netdb.h>\r
+# endif\r
+#endif\r
+\r
+#ifdef UNDER_CE\r
+# define close(a) CloseHandle(a);\r
+#elif defined( WIN32 )\r
+# define close(a) closesocket(a);\r
+#endif\r
+\r
+#include "network.h"\r
+#include "input_ext-plugins.h"\r
+\r
+#define NETSYNC_PORT_MASTER 9875\r
+#define NETSYNC_PORT_SLAVE 9876\r
+\r
+/*****************************************************************************\r
+ * Module descriptor\r
+ *****************************************************************************/\r
+static int Activate( vlc_object_t * );\r
+static void Close ( vlc_object_t * );\r
+\r
+static mtime_t GetClockRef( intf_thread_t *, mtime_t );\r
+\r
+#define NETSYNC_TEXT N_( "Act as master for network synchronisation" )\r
+#define NETSYNC_LONGTEXT N_( "Allows you to specify if this client should " \\r
+ "act as the master client for the network synchronisation." )\r
+\r
+#define MIP_TEXT N_( "Master client ip address" )\r
+#define MIP_LONGTEXT N_( "Allows you to specify the ip address of " \\r
+ "the master client used for the network synchronisation." )\r
+\r
+vlc_module_begin();\r
+ set_description( _("Network synchronisation") );\r
+\r
+ add_bool( "netsync-master", 0, NULL,\r
+ NETSYNC_TEXT, NETSYNC_LONGTEXT, VLC_TRUE );\r
+ add_string( "netsync-master-ip", NULL, NULL, MIP_TEXT, MIP_LONGTEXT,\r
+ VLC_TRUE );\r
+\r
+ set_capability( "interface", 0 );\r
+ set_callbacks( Activate, Close );\r
+vlc_module_end();\r
+\r
+struct intf_sys_t\r
+{\r
+ input_thread_t *p_input;\r
+};\r
+\r
+/*****************************************************************************\r
+ * Local prototypes\r
+ *****************************************************************************/\r
+static void Run( intf_thread_t *p_intf );\r
+\r
+/*****************************************************************************\r
+ * Activate: initialize and create stuff\r
+ *****************************************************************************/\r
+static int Activate( vlc_object_t *p_this )\r
+{\r
+ intf_thread_t *p_intf = (intf_thread_t*)p_this;\r
+\r
+ msg_Info( p_intf, "Using the netsync interface module..." );\r
+\r
+ p_intf->p_sys = malloc( sizeof( intf_sys_t ) );\r
+\r
+ p_intf->pf_run = Run;\r
+ return VLC_SUCCESS;\r
+}\r
+\r
+/*****************************************************************************\r
+ * Close: destroy interface\r
+ *****************************************************************************/\r
+void Close( vlc_object_t *p_this )\r
+{\r
+ intf_thread_t *p_intf = (intf_thread_t*)p_this;\r
+\r
+ free( p_intf->p_sys );\r
+}\r
+\r
+/*****************************************************************************\r
+ * Run: interface thread\r
+ *****************************************************************************/\r
+static void Run( intf_thread_t *p_intf )\r
+{\r
+#define MAX_MSG_LENGTH (2 * sizeof(int64_t))\r
+\r
+ vlc_bool_t b_master = config_GetInt( p_intf, "netsync-master" );\r
+ char *psz_master = config_GetPsz( p_intf, "netsync-master-ip" );\r
+ struct sockaddr_in master_addr;\r
+ char p_data[MAX_MSG_LENGTH];\r
+ int i_socket;\r
+\r
+ if( !psz_master || inet_addr( psz_master ) == INADDR_NONE )\r
+ {\r
+ if( psz_master ) free( psz_master );\r
+ msg_Err( p_intf, "invalid master address." );\r
+ return;\r
+ }\r
+\r
+ memset( &master_addr, 0, sizeof( struct sockaddr_in ) );\r
+ master_addr.sin_family = AF_INET;\r
+ master_addr.sin_port = htons( (uint16_t)NETSYNC_PORT_MASTER );\r
+ master_addr.sin_addr.s_addr = inet_addr( psz_master );\r
+ free( psz_master );\r
+\r
+ i_socket = net_OpenUDP( p_intf, NULL, b_master ? NETSYNC_PORT_MASTER :\r
+ NETSYNC_PORT_SLAVE, NULL, 0 );\r
+ if( i_socket < 0 )\r
+ {\r
+ msg_Err( p_intf, "failed opening UDP socket." );\r
+ return;\r
+ }\r
+\r
+ /* High priority thread */\r
+ vlc_thread_set_priority( p_intf, VLC_THREAD_PRIORITY_INPUT );\r
+\r
+ while( !p_intf->b_die )\r
+ {\r
+ struct timeval timeout;\r
+ fd_set fds_r;\r
+\r
+ /* Update the input */\r
+ if( p_intf->p_sys->p_input == NULL )\r
+ {\r
+ p_intf->p_sys->p_input =\r
+ (input_thread_t *)vlc_object_find( p_intf, VLC_OBJECT_INPUT,\r
+ FIND_ANYWHERE );\r
+ }\r
+ else if( p_intf->p_sys->p_input->b_dead )\r
+ {\r
+ vlc_object_release( p_intf->p_sys->p_input );\r
+ p_intf->p_sys->p_input = NULL;\r
+ }\r
+\r
+ if( p_intf->p_sys->p_input == NULL )\r
+ {\r
+ /* Wait a bit */\r
+ msleep( INTF_IDLE_SLEEP );\r
+ continue;\r
+ }\r
+\r
+ /*\r
+ * We now have an input\r
+ */\r
+\r
+ /* Initialize file descriptor set and timeout (0.5s) */\r
+ FD_ZERO( &fds_r );\r
+ FD_SET( i_socket, &fds_r );\r
+ timeout.tv_sec = 0;\r
+ timeout.tv_usec = 500000;\r
+\r
+ if( b_master )\r
+ {\r
+ struct sockaddr_in from;\r
+ mtime_t i_date, i_clockref, i_master_clockref;\r
+ int i_struct_size, i_read, i_ret;\r
+\r
+ /* Don't block */\r
+ i_ret = select( i_socket + 1, &fds_r, 0, 0, &timeout );\r
+ if( i_ret == 0 ) continue;\r
+ if( i_ret < 0 )\r
+ {\r
+ /* Wait a bit */\r
+ msleep( INTF_IDLE_SLEEP );\r
+ continue;\r
+ }\r
+\r
+ /* We received something */\r
+ i_struct_size = sizeof(struct sockaddr_in);\r
+ i_read = recvfrom( i_socket, p_data, MAX_MSG_LENGTH, 0,\r
+ (struct sockaddr*)&from, &i_struct_size );\r
+\r
+ from.sin_port = htons( (uint16_t)NETSYNC_PORT_SLAVE );\r
+\r
+ i_clockref = ntoh64(*(int64_t *)p_data);\r
+\r
+ i_date = mdate();\r
+ *(int64_t *)p_data = hton64( i_date );\r
+\r
+ i_master_clockref = GetClockRef( p_intf, i_clockref );\r
+ *(((int64_t *)p_data)+1) = hton64( i_master_clockref );\r
+\r
+ /* Reply to the sender */\r
+ sendto( i_socket, p_data, 2 * sizeof(int64_t), 0,\r
+ (struct sockaddr *)&from, sizeof(struct sockaddr_in) );\r
+\r
+ msg_Dbg( p_intf, "Master clockref: "I64Fd" -> "I64Fd", from %s "\r
+ "(date: "I64Fd")", i_clockref, i_master_clockref, \r
+ inet_ntoa(from.sin_addr), i_date );\r
+ }\r
+ else\r
+ {\r
+ mtime_t i_send_date, i_receive_date, i_master_date, i_diff_date;\r
+ mtime_t i_master_clockref, i_client_clockref, i_drift;\r
+ mtime_t i_clockref = 0;\r
+ int i_sent, i_read, i_ret;\r
+\r
+ /* Send clock request to the master */\r
+ *(int64_t *)p_data = hton64( i_clockref );\r
+ i_send_date = mdate();\r
+\r
+ i_sent = sendto( i_socket, p_data, sizeof(int64_t), 0,\r
+ (struct sockaddr *)&master_addr,\r
+ sizeof(struct sockaddr_in) );\r
+ if( i_sent <= 0 )\r
+ {\r
+ /* Wait a bit */\r
+ msleep( INTF_IDLE_SLEEP );\r
+ continue;\r
+ }\r
+\r
+ /* Don't block */\r
+ i_ret = select(i_socket + 1, &fds_r, 0, 0, &timeout);\r
+ if( i_ret == 0 ) continue;\r
+ if( i_ret < 0 )\r
+ {\r
+ /* Wait a bit */\r
+ msleep( INTF_IDLE_SLEEP );\r
+ continue;\r
+ }\r
+\r
+ i_receive_date = mdate();\r
+\r
+ i_read = recv( i_socket, p_data, MAX_MSG_LENGTH, 0 );\r
+ if( i_read <= 0 )\r
+ {\r
+ /* Wait a bit */\r
+ msleep( INTF_IDLE_SLEEP );\r
+ continue;\r
+ }\r
+\r
+ i_master_date = ntoh64(*(int64_t *)p_data);\r
+ i_master_clockref = ntoh64(*(((int64_t *)p_data)+1));\r
+\r
+ i_diff_date = i_receive_date -\r
+ ((i_receive_date - i_send_date) / 2 + i_master_date);\r
+\r
+ i_client_clockref = i_drift = 0;\r
+ if( p_intf->p_sys->p_input && i_master_clockref )\r
+ {\r
+ i_client_clockref = GetClockRef( p_intf, i_clockref );\r
+ i_drift = i_client_clockref - i_master_clockref - i_diff_date;\r
+\r
+ /* Update our clock to match the master's one */\r
+ if( i_client_clockref )\r
+ p_intf->p_sys->p_input->i_pts_delay -= i_drift;\r
+ }\r
+\r
+ msg_Dbg( p_intf, "Slave clockref: "I64Fd" -> "I64Fd" -> "I64Fd", "\r
+ "clock diff: "I64Fd" drift: "I64Fd,\r
+ i_clockref, i_master_clockref, \r
+ i_client_clockref, i_diff_date, i_drift );\r
+\r
+ /* Wait a bit */\r
+ msleep( INTF_IDLE_SLEEP );\r
+ }\r
+ }\r
+\r
+ if( p_intf->p_sys->p_input ) vlc_object_release( p_intf->p_sys->p_input );\r
+ net_Close( i_socket );\r
+}\r
+\r
+static mtime_t GetClockRef( intf_thread_t *p_intf, mtime_t i_pts )\r
+{\r
+ input_thread_t *p_input = p_intf->p_sys->p_input;\r
+ pgrm_descriptor_t *p_pgrm;\r
+\r
+ if( !p_input ) return 0;\r
+\r
+ p_pgrm = p_input->stream.p_selected_program;\r
+ if( p_pgrm ) return input_ClockGetTS( p_input, p_pgrm, i_pts );\r
+\r
+ return 0;\r
+}\r
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