Commit 1c1ae9cb authored by Jean-Paul Saman's avatar Jean-Paul Saman Committed by Laurent Aimar

netsync: rewrite

Signed-off-by: default avatarLaurent Aimar <fenrir@videolan.org>
parent 709d0455
/*****************************************************************************
* netsync.c: synchronisation between several network clients.
*****************************************************************************
* Copyright (C) 2004 the VideoLAN team
* Copyright (C) 2004-2009 the VideoLAN team
* $Id$
*
* Authors: Gildas Bazin <gbazin@videolan.org>
* Jean-Paul Saman <jpsaman@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
......@@ -32,7 +33,7 @@
#include <vlc_plugin.h>
#include <vlc_interface.h>
#include <vlc_input.h>
#include <vlc_es_out.h>
#include <vlc_playlist.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
......@@ -46,26 +47,24 @@
#define NETSYNC_PORT 9875
/* FIXME: UGLY UGLY !! Netsync should be totally reworked */
#include "../../src/input/input_internal.h"
/*****************************************************************************
* 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_( "Network master clock" )
#define NETSYNC_LONGTEXT N_( "When set then " \
"this vlc instance shall dictate its clock for synchronisation" \
"over clients listening on the masters network ip address" )
/// \bug [String] This string is BAD.
#define NETSYNC_TEXT N_( "Act as master" )
#define NETSYNC_LONGTEXT N_( "Should " \
"act as the master client for the network synchronisation?" )
#define MIP_TEXT N_( "Master server ip address" )
#define MIP_LONGTEXT N_( "The IP address of " \
"the network master clock to use for clock synchronisation." )
/// \bug [String] This string is BAD.
#define MIP_TEXT N_( "Master client ip address" )
#define MIP_LONGTEXT N_( "IP address of " \
"the master client used for the network synchronisation." )
#define NETSYNC_TIMEOUT_TEXT N_( "UDP timeout (in ms)" )
#define NETSYNC_TIMEOUT_LONGTEXT N_("Amount of time (in ms) " \
"to wait before aborting network reception of data." )
vlc_module_begin ()
set_shortname( N_("Network Sync"))
......@@ -77,6 +76,8 @@ vlc_module_begin ()
NETSYNC_TEXT, NETSYNC_LONGTEXT, true )
add_string( "netsync-master-ip", NULL, NULL, MIP_TEXT, MIP_LONGTEXT,
true )
add_integer( "netsync-timeout", 500, NULL,
NETSYNC_TIMEOUT_TEXT, NETSYNC_TIMEOUT_LONGTEXT, true )
set_capability( "interface", 0 )
set_callbacks( Activate, Close )
......@@ -95,7 +96,7 @@ static int Activate( vlc_object_t *p_this )
intf_thread_t *p_intf = (intf_thread_t*)p_this;
int fd;
if( !var_InheritInteger( p_intf, "netsync-master" ) )
if( !var_InheritBool( p_intf, "netsync-master" ) )
{
char *psz_master = var_InheritString( p_intf, "netsync-master-ip" );
if( psz_master == NULL )
......@@ -136,11 +137,15 @@ void Close( vlc_object_t *p_this )
static void Run( intf_thread_t *p_intf )
{
#define MAX_MSG_LENGTH (2 * sizeof(int64_t))
int canc = vlc_savecancel();
input_thread_t *p_input = NULL;
char p_data[MAX_MSG_LENGTH];
int i_socket;
int canc = vlc_savecancel();
playlist_t *p_playlist = pl_Hold( p_intf );
int i_timeout = __MIN( 500, var_InheritInteger( p_intf, "netsync-timeout" ) );
bool b_master = var_InheritBool( p_intf, "netsync-master" );
i_socket = (intptr_t)p_intf->p_sys;
/* High priority thread */
vlc_thread_set_priority( p_intf, VLC_THREAD_PRIORITY_INPUT );
......@@ -149,10 +154,10 @@ static void Run( intf_thread_t *p_intf )
{
/* Update the input */
if( p_input == NULL )
p_input =
(input_thread_t *)vlc_object_find( p_intf, VLC_OBJECT_INPUT,
FIND_ANYWHERE );
else if( p_input->b_dead )
{
p_input = playlist_CurrentInput( p_playlist );
}
else if( p_input->b_dead || !vlc_object_alive( p_input ) )
{
vlc_object_release( p_input );
p_input = NULL;
......@@ -176,18 +181,14 @@ static void Run( intf_thread_t *p_intf )
if( b_master )
{
struct sockaddr_storage from;
mtime_t i_date, i_clockref, i_master_clockref;
mtime_t i_master_system;
mtime_t i_client_system;
mtime_t i_date;
int i_struct_size, i_read, i_ret;
/* Don't block */
i_ret = poll( &ufd, 1, 500 );
if( i_ret == 0 ) continue;
if( i_ret < 0 )
{
/* Wait a bit */
msleep( INTF_IDLE_SLEEP );
continue;
}
i_ret = poll( &ufd, 1, i_timeout );
if( i_ret <= 0 ) continue;
/* We received something */
i_struct_size = sizeof( from );
......@@ -195,13 +196,17 @@ static void Run( intf_thread_t *p_intf )
(struct sockaddr*)&from,
(unsigned int *)&i_struct_size );
i_clockref = ntoh64(*(int64_t *)p_data);
/* not sure we need the client information to sync,
since we are the master anyway */
i_client_system = 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 );
if( input_GetPcrSystem( p_input, &i_master_system ) )
continue;
*((int64_t *)p_data) = hton64( i_date );
*(((int64_t *)p_data)+1) = hton64( i_master_system );
/* Reply to the sender */
sendto( i_socket, p_data, 2 * sizeof(int64_t), 0,
......@@ -209,96 +214,88 @@ static void Run( intf_thread_t *p_intf )
#if 0
msg_Dbg( p_intf, "Master clockref: %"PRId64" -> %"PRId64", from %s "
"(date: %"PRId64")", i_clockref, i_master_clockref,
from.ss_family == AF_INET
? inet_ntoa(((struct sockaddr_in *)&from)->sin_addr)
"(date: %"PRId64")", i_client_system, i_master_system,
(from.ss_family == AF_INET) ? inet_ntoa(((struct sockaddr_in *)&from)->sin_addr)
: "non-IPv4", i_date );
#endif
}
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;
mtime_t i_master_system;
mtime_t i_client_system;
mtime_t i_system = 0;
mtime_t i_send_date, i_receive_date;
mtime_t i_diff_date, i_master_date;
int i_sent, i_read, i_ret;
if( input_GetPcrSystem( p_input, &i_system ) )
{
msleep( INTF_IDLE_SLEEP );
continue;
}
/* Send clock request to the master */
*(int64_t *)p_data = hton64( i_clockref );
i_send_date = mdate();
*((int64_t *)p_data) = hton64( i_system );
i_sent = send( i_socket, p_data, sizeof(int64_t), 0 );
if( i_sent <= 0 )
{
/* Wait a bit */
msleep( INTF_IDLE_SLEEP );
continue;
}
/* Don't block */
i_ret = poll( &ufd, 1, 500 );
i_ret = poll( &ufd, 1, i_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_master_system = ntoh64(*(((int64_t *)p_data)+1)); /* system date */
i_diff_date = i_receive_date -
((i_receive_date - i_send_date) / 2 + i_master_date);
i_client_clockref = i_drift = 0;
if( p_input && i_master_clockref )
if( p_input && i_master_system > 0 )
{
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_input->i_pts_delay -= i_drift;
}
mtime_t i_diff_system;
if( input_GetPcrSystem( p_input, &i_client_system ) )
{
msleep( INTF_IDLE_SLEEP );
continue;
}
i_diff_system = i_client_system - i_master_system - i_diff_date;
if( i_diff_system != 0 )
{
input_ModifyPcrSystem( p_input, true, i_master_system - i_diff_date );
#if 0
msg_Dbg( p_intf, "Slave clockref: %"PRId64" -> %"PRId64" -> %"PRId64", "
"clock diff: %"PRId64" drift: %"PRId64,
i_clockref, i_master_clockref,
i_client_clockref, i_diff_date, i_drift );
msg_Dbg( p_intf, "Slave clockref: %"PRId64" -> %"PRId64" -> %"PRId64","
" clock diff: %"PRId64", diff: %"PRId64"",
i_system, i_master_system, i_client_system,
i_diff_system, i_diff_date );
#endif
/* Wait a bit */
}
}
msleep( INTF_IDLE_SLEEP );
}
}
if( p_input ) vlc_object_release( p_input );
pl_Release( p_intf );
vlc_restorecancel( canc );
}
static mtime_t GetClockRef( intf_thread_t *p_intf, mtime_t i_pts )
{
input_thread_t *p_input = p_intf->p_sys->p_input;
mtime_t i_ts;
if( !p_input || !p_input->p->p_es_out ) return 0;
if( es_out_Control( p_input->p->p_es_out, ES_OUT_GET_TS, i_pts, &i_ts ) ==
VLC_SUCCESS )
{
return i_ts;
}
return 0;
}
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