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vlc/modules/access/udp.c

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/*****************************************************************************
* udp.c: raw UDP & RTP input module
*****************************************************************************
* Copyright (C) 2001-2004 VideoLAN
* $Id$
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
* Tristan Leteurtre <tooney@via.ecp.fr>
* Laurent Aimar <fenrir@via.ecp.fr>
*
* Reviewed: 23 October 2003, Jean-Paul Saman <jpsaman@wxs.nl>
*
* 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/input.h>
#include "network.h"
/*****************************************************************************
* Module descriptor
*****************************************************************************/
#define CACHING_TEXT N_("Caching value in ms")
#define CACHING_LONGTEXT N_( \
"Allows you to modify the default caching value for UDP streams. This " \
"value should be set in millisecond units." )
#define AUTO_MTU_TEXT N_("Autodetection of MTU")
#define AUTO_MTU_LONGTEXT N_( \
"Allows growing the MTU if truncated packets are found" )
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
vlc_module_begin();
set_description( _("UDP/RTP input") );
add_integer( "udp-caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT,
CACHING_LONGTEXT, VLC_TRUE );
add_bool( "udp-auto-mtu", 1, NULL,
AUTO_MTU_TEXT, AUTO_MTU_LONGTEXT, VLC_TRUE );
set_capability( "access2", 0 );
add_shortcut( "udp" );
add_shortcut( "udpstream" );
add_shortcut( "udp4" );
add_shortcut( "udp6" );
add_shortcut( "rtp" );
add_shortcut( "rtp4" );
add_shortcut( "rtp6" );
set_callbacks( Open, Close );
vlc_module_end();
/*****************************************************************************
* Local prototypes
*****************************************************************************/
#define RTP_HEADER_LEN 12
static block_t *BlockUDP( access_t * );
static block_t *BlockRTP( access_t * );
static block_t *BlockChoose( access_t * );
static int Control( access_t *, int, va_list );
struct access_sys_t
{
int fd;
int i_mtu;
vlc_bool_t b_auto_mtu;
};
/*****************************************************************************
* Open: open the socket
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
access_t *p_access = (access_t*)p_this;
access_sys_t *p_sys;
char *psz_name = strdup( p_access->psz_path );
char *psz_parser = psz_name;
char *psz_server_addr = "";
char *psz_server_port = "";
char *psz_bind_addr = "";
char *psz_bind_port = "";
int i_bind_port = 0;
int i_server_port = 0;
/* First set ipv4/ipv6 */
var_Create( p_access, "ipv4", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
var_Create( p_access, "ipv6", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
if( *p_access->psz_access )
{
vlc_value_t val;
/* Find out which shortcut was used */
if( !strncmp( p_access->psz_access, "udp4", 6 ) ||
!strncmp( p_access->psz_access, "rtp4", 6 ))
{
val.b_bool = VLC_TRUE;
var_Set( p_access, "ipv4", val );
val.b_bool = VLC_FALSE;
var_Set( p_access, "ipv6", val );
}
else if( !strncmp( p_access->psz_access, "udp6", 6 ) ||
!strncmp( p_access->psz_access, "rtp6", 6 ) )
{
val.b_bool = VLC_TRUE;
var_Set( p_access, "ipv6", val );
val.b_bool = VLC_FALSE;
var_Set( p_access, "ipv4", val );
}
}
/* Parse psz_name syntax :
* [serveraddr[:serverport]][@[bindaddr]:[bindport]] */
if( *psz_parser && *psz_parser != '@' )
{
/* Found server */
psz_server_addr = psz_parser;
while( *psz_parser && *psz_parser != ':' && *psz_parser != '@' )
{
if( *psz_parser == '[' )
{
/* IPv6 address */
while( *psz_parser && *psz_parser != ']' )
{
psz_parser++;
}
}
psz_parser++;
}
if( *psz_parser == ':' )
{
/* Found server port */
*psz_parser++ = '\0'; /* Terminate server name */
psz_server_port = psz_parser;
while( *psz_parser && *psz_parser != '@' )
{
psz_parser++;
}
}
}
if( *psz_parser == '@' )
{
/* Found bind address or bind port */
*psz_parser++ = '\0'; /* Terminate server port or name if necessary */
if( *psz_parser && *psz_parser != ':' )
{
/* Found bind address */
psz_bind_addr = psz_parser;
while( *psz_parser && *psz_parser != ':' )
{
if( *psz_parser == '[' )
{
/* IPv6 address */
while( *psz_parser && *psz_parser != ']' )
{
psz_parser++;
}
}
psz_parser++;
}
}
if( *psz_parser == ':' )
{
/* Found bind port */
*psz_parser++ = '\0'; /* Terminate bind address if necessary */
psz_bind_port = psz_parser;
}
}
i_server_port = strtol( psz_server_port, NULL, 10 );
if( ( i_bind_port = strtol( psz_bind_port, NULL, 10 ) ) == 0 )
{
i_bind_port = var_CreateGetInteger( p_access, "server-port" );
}
msg_Dbg( p_access, "opening server=%s:%d local=%s:%d",
psz_server_addr, i_server_port, psz_bind_addr, i_bind_port );
/* Set up p_access */
p_access->pf_read = NULL;
p_access->pf_block = BlockChoose;
p_access->pf_control = Control;
p_access->pf_seek = NULL;
p_access->info.i_update = 0;
p_access->info.i_size = 0;
p_access->info.i_pos = 0;
p_access->info.b_eof = VLC_FALSE;
p_access->info.i_title = 0;
p_access->info.i_seekpoint = 0;
p_access->p_sys = p_sys = malloc( sizeof( access_sys_t ) );
p_sys->fd = net_OpenUDP( p_access, psz_bind_addr, i_bind_port,
psz_server_addr, i_server_port );
if( p_sys->fd < 0 )
{
msg_Err( p_access, "cannot open socket" );
free( psz_name );
free( p_sys );
return VLC_EGENERIC;
}
free( psz_name );
/* FIXME */
p_sys->i_mtu = var_CreateGetInteger( p_access, "mtu" );
if( p_sys->i_mtu <= 1 )
p_sys->i_mtu = 1500; /* Avoid problem */
p_sys->b_auto_mtu = var_CreateGetBool( p_access, "udp-auto-mtu" );;
/* Update default_pts to a suitable value for udp access */
var_Create( p_access, "udp-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
return VLC_SUCCESS;
}
/*****************************************************************************
* Close: free unused data structures
*****************************************************************************/
static void Close( vlc_object_t *p_this )
{
access_t *p_access = (access_t*)p_this;
access_sys_t *p_sys = p_access->p_sys;
net_Close( p_sys->fd );
free( p_sys );
}
/*****************************************************************************
* Control:
*****************************************************************************/
static int Control( access_t *p_access, int i_query, va_list args )
{
access_sys_t *p_sys = p_access->p_sys;
vlc_bool_t *pb_bool;
int *pi_int;
int64_t *pi_64;
switch( i_query )
{
/* */
case ACCESS_CAN_SEEK:
case ACCESS_CAN_FASTSEEK:
case ACCESS_CAN_PAUSE:
case ACCESS_CAN_CONTROL_PACE:
pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
*pb_bool = VLC_FALSE;
break;
/* */
case ACCESS_GET_MTU:
pi_int = (int*)va_arg( args, int * );
*pi_int = p_sys->i_mtu;
break;
case ACCESS_GET_PTS_DELAY:
pi_64 = (int64_t*)va_arg( args, int64_t * );
*pi_64 = var_GetInteger( p_access, "udp-caching" ) * 1000;
break;
/* */
case ACCESS_SET_PAUSE_STATE:
case ACCESS_GET_TITLE_INFO:
case ACCESS_SET_TITLE:
case ACCESS_SET_SEEKPOINT:
case ACCESS_SET_PRIVATE_ID_STATE:
return VLC_EGENERIC;
default:
msg_Warn( p_access, "unimplemented query in control" );
return VLC_EGENERIC;
}
return VLC_SUCCESS;
}
/*****************************************************************************
* BlockUDP:
*****************************************************************************/
static block_t *BlockUDP( access_t *p_access )
{
access_sys_t *p_sys = p_access->p_sys;
block_t *p_block;
/* Read data */
p_block = block_New( p_access, p_sys->i_mtu );
p_block->i_buffer = net_Read( p_access, p_sys->fd, NULL,
p_block->p_buffer, p_sys->i_mtu,
VLC_FALSE );
if( p_block->i_buffer <= 0 )
{
block_Release( p_block );
return NULL;
}
if( p_block->i_buffer >= p_sys->i_mtu && p_sys->b_auto_mtu &&
p_sys->i_mtu < 32767 )
{
/* Increase by 100% */
p_sys->i_mtu *= 2;
msg_Dbg( p_access, "increasing MTU to %d", p_sys->i_mtu );
}
return p_block;
}
/*****************************************************************************
* BlockParseRTP/BlockRTP:
*****************************************************************************/
static block_t *BlockParseRTP( access_t *p_access, block_t *p_block )
{
int i_rtp_version;
int i_CSRC_count;
int i_payload_type;
int i_skip = 0;
if( p_block->i_buffer < RTP_HEADER_LEN )
goto trash;
/* Parse the header and make some verifications.
* See RFC 1889 & RFC 2250. */
i_rtp_version = ( p_block->p_buffer[0] & 0xC0 ) >> 6;
i_CSRC_count = ( p_block->p_buffer[0] & 0x0F );
i_payload_type = ( p_block->p_buffer[1] & 0x7F );
if ( i_rtp_version != 2 )
msg_Dbg( p_access, "RTP version is %u, should be 2", i_rtp_version );
if( i_payload_type == 14 )
i_skip = 4;
else if( i_payload_type != 33 && i_payload_type != 32 )
msg_Dbg( p_access, "unsupported RTP payload type (%u)", i_payload_type );
i_skip += RTP_HEADER_LEN + 4*i_CSRC_count;
/* A CSRC extension field is 32 bits in size (4 bytes) */
if( i_skip >= p_block->i_buffer )
goto trash;
/* Return the packet without the RTP header. */
p_block->i_buffer -= i_skip;
p_block->p_buffer += i_skip;
return p_block;
trash:
msg_Warn( p_access, "received a too short packet for RTP" );
block_Release( p_block );
return NULL;
}
static block_t *BlockRTP( access_t *p_access )
{
return BlockParseRTP( p_access, BlockUDP( p_access ) );
}
/*****************************************************************************
* BlockChoose: decide between RTP and UDP
*****************************************************************************/
static block_t *BlockChoose( access_t *p_access )
{
block_t *p_block;
int i_rtp_version;
int i_CSRC_count;
int i_payload_type;
if( ( p_block = BlockUDP( p_access ) ) == NULL )
return NULL;
if( p_block->p_buffer[0] == 0x47 )
{
msg_Dbg( p_access, "detected TS over raw UDP" );
p_access->pf_block = BlockUDP;
return p_block;
}
if( p_block->i_buffer < RTP_HEADER_LEN )
return p_block;
/* Parse the header and make some verifications.
* See RFC 1889 & RFC 2250. */
i_rtp_version = ( p_block->p_buffer[0] & 0xC0 ) >> 6;
i_CSRC_count = ( p_block->p_buffer[0] & 0x0F );
i_payload_type = ( p_block->p_buffer[1] & 0x7F );
if( i_rtp_version != 2 )
{
msg_Dbg( p_access, "no supported RTP header detected" );
p_access->pf_block = BlockUDP;
return p_block;
}
switch( i_payload_type )
{
case 33:
msg_Dbg( p_access, "detected TS over RTP" );
p_access->psz_demux = strdup( "ts" );
break;
case 14:
msg_Dbg( p_access, "detected MPEG audio over RTP" );
p_access->psz_demux = strdup( "mpga" );
break;
case 32:
msg_Dbg( p_access, "detected MPEG video over RTP" );
p_access->psz_demux = strdup( "mpgv" );
break;
default:
msg_Dbg( p_access, "no RTP header detected" );
p_access->pf_block = BlockUDP;
return p_block;
}
p_access->pf_block = BlockRTP;
return BlockParseRTP( p_access, p_block );
}
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