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Support for TCP/RTP/AVP (rtptcp://).

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This is no excuse for using TCP instead of UDP/UDP-Lite when you can.
This commit is contained in:
Rémi Denis-Courmont 2007-02-12 19:42:40 +00:00
parent 64bbfe6b27
commit 9a62137022
1 changed files with 93 additions and 11 deletions
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104
modules/access/udp.c
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@ -95,6 +95,7 @@ vlc_module_begin();
add_shortcut( "rtp4" );
add_shortcut( "rtp6" );
add_shortcut( "udplite" );
add_shortcut( "rtptcp" );
set_callbacks( Open, Close );
vlc_module_end();
@ -105,6 +106,7 @@ vlc_module_end();
#define RTP_HEADER_LEN 12
static block_t *BlockUDP( access_t * );
static block_t *BlockTCP( access_t * );
static block_t *BlockRTP( access_t * );
static block_t *BlockChoose( access_t * );
static int Control( access_t *, int, va_list );
@ -115,12 +117,14 @@ struct access_sys_t
int i_mtu;
vlc_bool_t b_auto_mtu;
vlc_bool_t b_framed_rtp;
/* reorder rtp packets when out-of-sequence */
mtime_t i_rtp_late;
uint16_t i_last_seqno;
mtime_t i_rtp_late;
block_t *p_list;
block_t *p_end;
block_t *p_partial_frame; /* Partial Framed RTP packet */
};
/*****************************************************************************
@ -136,6 +140,7 @@ static int Open( vlc_object_t *p_this )
const char *psz_server_addr, *psz_bind_addr = "";
int i_bind_port, i_server_port = 0;
int fam = AF_UNSPEC, proto = IPPROTO_UDP;
vlc_bool_t b_framed = VLC_FALSE;
if (strlen (p_access->psz_access) >= 3)
{
@ -151,6 +156,11 @@ static int Open( vlc_object_t *p_this )
}
if (strcmp (p_access->psz_access + 3, "lite") == 0)
proto = IPPROTO_UDPLITE;
if (strcmp (p_access->psz_access + 3, "tcp") == 0)
{
proto = IPPROTO_TCP;
b_framed = VLC_TRUE;
}
}
i_bind_port = var_CreateGetInteger( p_access, "server-port" );
@ -203,7 +213,9 @@ static int Open( vlc_object_t *p_this )
p_access->info.b_prebuffered = VLC_FALSE;
MALLOC_ERR( p_access->p_sys, access_sys_t ); p_sys = p_access->p_sys;
p_sys->fd = net_OpenDgram( p_access, psz_bind_addr, i_bind_port,
p_sys->fd = b_framed
? net_ConnectTCP( p_access, psz_server_addr, i_server_port )
: net_OpenDgram( p_access, psz_bind_addr, i_bind_port,
psz_server_addr, i_server_port, fam, proto );
free (psz_name);
if( p_sys->fd == -1 )
@ -222,12 +234,18 @@ static int Open( vlc_object_t *p_this )
&(int){ 20 }, sizeof (int));
#endif
/* 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_framed_rtp = b_framed;
if (b_framed)
p_sys->i_mtu = 65535;
else
{
/* 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" );;
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 );
@ -330,6 +348,68 @@ static block_t *BlockUDP( access_t *p_access )
return p_block;
}
/*****************************************************************************
* BlockTCP: Framed RTP/AVP packet reception for COMEDIA
* Still an I-D (draft-ietf-avt-rtp-framing-contrans-06) - subject to change.
*****************************************************************************/
static block_t *BlockTCP( access_t *p_access )
{
access_sys_t *p_sys = p_access->p_sys;
block_t *p_block = p_sys->p_partial_frame;
int i_read;
if( p_block == NULL )
{
/* MTU should always be 65535 in this case */
p_sys->p_partial_frame = p_block = block_New( p_access, 65537 );
if (p_block == NULL)
return NULL;
}
/* Read RTP framing */
if (p_block->i_buffer < 2)
{
/* FIXME: not very efficient */
i_read = net_Read( p_access, p_sys->fd, NULL,
p_block->p_buffer + p_block->i_buffer,
2 - p_block->i_buffer, VLC_FALSE );
if( i_read <= 0 )
goto error;
p_block->i_buffer += i_read;
if (p_block->i_buffer < 2)
return NULL;
}
uint16_t framelen = GetWLE( p_block->p_buffer );
/* Read RTP frame */
if( framelen > 0 )
{
i_read = net_Read( p_access, p_sys->fd, NULL,
p_block->p_buffer + p_block->i_buffer,
2 + framelen - p_block->i_buffer, VLC_FALSE );
if( i_read <= 0 )
goto error;
p_block->i_buffer += i_read;
}
if( p_block->i_buffer < (2 + framelen) )
return NULL; // incomplete frame
/* Hide framing from RTP layer */
p_block->p_buffer += 2;
p_block->i_buffer -= 2;
p_sys->p_partial_frame = NULL;
return p_block;
error:
block_Release( p_block );
p_sys->p_partial_frame = NULL;
return NULL;
}
/*
* rtp_ChainInsert - insert a p_block in the chain and
* look at the sequence numbers.
@ -389,7 +469,7 @@ static inline vlc_bool_t rtp_ChainInsert( access_t *p_access, block_t *p_block )
}
if( !i_tmp ) /* trash duplicate */
break;
break;
/* reordering failed - append the packet to the end of queue */
msg_Dbg(p_access, "RTP: sequence changed (or buffer too small) "
@ -497,7 +577,9 @@ static block_t *BlockPrebufferRTP( access_t *p_access, block_t *p_block )
if( i_count > 2 && (i_date - i_first) > p_sys->i_rtp_late )
break;
p = BlockParseRTP( p_access, BlockUDP( p_access ));
p = BlockParseRTP( p_access,
p_sys->b_framed_rtp ? BlockTCP( p_access )
: BlockUDP( p_access ) );
if( !p && (i_date - i_first) > p_sys->i_rtp_late )
{
msg_Err( p_access, "error in RTP prebuffering!" );
@ -519,12 +601,12 @@ static block_t *BlockRTP( access_t *p_access )
access_sys_t *p_sys = p_access->p_sys;
block_t *p;
while ( !p_sys->p_list ||
while ( !p_sys->p_list ||
( mdate() - p_sys->p_list->i_pts ) < p_sys->i_rtp_late )
{
p = BlockParseRTP( p_access, BlockUDP( p_access ));
if ( !p )
if ( !p )
return NULL;
rtp_ChainInsert( p_access, p );