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vlc-2-2
Commit 26f8df3b authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont
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UDP: remove old RTP code

parent 51a5b2be
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Showing with 14 additions and 419 deletions
modules/access/udp.c
View file @ 26f8df3b
/*****************************************************************************
* udp.c: raw UDP & RTP input module
* udp.c: raw UDP input module
*****************************************************************************
* Copyright (C) 2001-2005 the VideoLAN team
* Copyright (C) 2007 Remi Denis-Courmont
......@@ -51,23 +51,18 @@
"Caching value for UDP streams. This " \
"value should be set in milliseconds." )
#define RTP_LATE_TEXT N_("RTP reordering timeout in ms")
#define RTP_LATE_LONGTEXT N_( \
"VLC reorders RTP packets. The input will wait for late packets at most "\
"the time specified here (in milliseconds)." )
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
vlc_module_begin();
set_shortname( N_("UDP/RTP" ) );
set_description( N_("UDP/RTP input") );
set_shortname( N_("UDP" ) );
set_description( N_("UDP input") );
set_category( CAT_INPUT );
set_subcategory( SUBCAT_INPUT_ACCESS );
add_integer( "udp-caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT,
CACHING_LONGTEXT, true );
add_integer( "rtp-late", 100, NULL, RTP_LATE_TEXT, RTP_LATE_LONGTEXT, true );
add_obsolete_integer( "rtp-late" );
add_obsolete_bool( "udp-auto-mtu" );
set_capability( "access", 0 );
......@@ -75,7 +70,6 @@ vlc_module_begin();
add_shortcut( "udpstream" );
add_shortcut( "udp4" );
add_shortcut( "udp6" );
add_shortcut( "rtptcp" ); /* tcp name is already taken */
set_callbacks( Open, Close );
vlc_module_end();
......@@ -86,44 +80,26 @@ vlc_module_end();
#define RTP_HEADER_LEN 12
static block_t *BlockUDP( access_t * );
static block_t *BlockStartRTP( access_t * );
static block_t *BlockRTP( access_t * );
static int Control( access_t *, int, va_list );
struct access_sys_t
{
int fd;
bool b_framed_rtp, b_comedia;
/* reorder rtp packets when out-of-sequence */
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 */
};
/*****************************************************************************
* 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;
const char *psz_server_addr, *psz_bind_addr = "";
int i_bind_port, i_server_port = 0;
int fam = AF_UNSPEC, proto = IPPROTO_UDP;
int fam = AF_UNSPEC;
int fd;
/* Set up p_access */
access_InitFields( p_access );
ACCESS_SET_CALLBACKS( NULL, BlockStartRTP, Control, NULL );
ACCESS_SET_CALLBACKS( NULL, BlockUDP, Control, NULL );
p_access->info.b_prebuffered = false;
MALLOC_ERR( p_access->p_sys, access_sys_t ); p_sys = p_access->p_sys;
memset (p_sys, 0, sizeof (*p_sys));
if (strlen (p_access->psz_access) > 0)
{
......@@ -137,12 +113,6 @@ static int Open( vlc_object_t *p_this )
fam = AF_INET6;
break;
}
if (strncmp (p_access->psz_access, "udp", 3 ) == 0 )
p_access->pf_block = BlockUDP;
else
if (strcmp (p_access->psz_access, "rtptcp") == 0)
proto = IPPROTO_TCP;
}
i_bind_port = var_CreateGetInteger( p_access, "server-port" );
......@@ -189,40 +159,18 @@ static int Open( vlc_object_t *p_this )
msg_Dbg( p_access, "opening server=%s:%d local=%s:%d",
psz_server_addr, i_server_port, psz_bind_addr, i_bind_port );
/* Hmm, the net_* connection functions may need to be unified... */
switch (proto)
{
case IPPROTO_UDP:
p_sys->fd = net_OpenDgram( p_access, psz_bind_addr, i_bind_port,
psz_server_addr, i_server_port, fam,
proto );
break;
case IPPROTO_TCP:
p_sys->fd = net_ConnectTCP( p_access, psz_server_addr, i_server_port );
p_access->pf_block = BlockRTP;
p_sys->b_comedia = p_sys->b_framed_rtp = true;
break;
}
fd = net_OpenDgram( p_access, psz_bind_addr, i_bind_port,
psz_server_addr, i_server_port, fam, IPPROTO_UDP );
free (psz_name);
if( p_sys->fd == -1 )
if( fd == -1 )
{
msg_Err( p_access, "cannot open socket" );
free( p_sys );
return VLC_EGENERIC;
}
shutdown( p_sys->fd, SHUT_WR );
net_SetCSCov (p_sys->fd, -1, 12);
p_access->p_sys = (void *)(intptr_t)fd;
/* Update default_pts to a suitable value for udp access */
var_Create( p_access, "udp-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
/* RTP reordering for out-of-sequence packets */
p_sys->i_rtp_late = var_CreateGetInteger( p_access, "rtp-late" ) * 1000;
p_sys->i_last_seqno = 0;
p_sys->p_list = NULL;
p_sys->p_end = NULL;
return VLC_SUCCESS;
}
......@@ -232,11 +180,8 @@ static int Open( vlc_object_t *p_this )
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;
block_ChainRelease( p_sys->p_list );
net_Close( p_sys->fd );
free( p_sys );
net_Close( (intptr_t)p_access->p_sys );
}
/*****************************************************************************
......@@ -300,363 +245,13 @@ static block_t *BlockUDP( access_t *p_access )
/* Read data */
p_block = block_New( p_access, MTU );
len = net_Read( p_access, p_sys->fd, NULL,
len = net_Read( p_access, (intptr_t)p_sys, NULL,
p_block->p_buffer, MTU, false );
if( ( len < 0 )
|| ( p_sys->b_comedia && ( len == 0 ) ) )
if( len < 0 )
{
if( p_sys->b_comedia )
{
p_access->info.b_eof = true;
msg_Dbg( p_access, "connection-oriented media hangup" );
}
block_Release( p_block );
return NULL;
}
return block_Realloc( p_block, 0, p_block->i_buffer = len );
}
/*****************************************************************************
* BlockTCP: Framed RTP/AVP packet reception for COMEDIA (see RFC4571)
*****************************************************************************/
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;
if( p_access->info.b_eof )
return NULL;
if( p_block == NULL )
{
/* MTU should always be 65535 in this case */
p_sys->p_partial_frame = p_block = block_New( p_access, 2 + MTU );
if (p_block == NULL)
return NULL;
}
/* Read RTP framing */
if (p_block->i_buffer < 2)
{
int i_read = net_Read( p_access, p_sys->fd, NULL,
p_block->p_buffer + p_block->i_buffer,
2 - p_block->i_buffer, 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 )
{
int i_read = net_Read( p_access, p_sys->fd, NULL,
p_block->p_buffer + p_block->i_buffer,
2 + framelen - p_block->i_buffer, false );
if( i_read <= 0 )
goto error;
p_block->i_buffer += i_read;
}
if( p_block->i_buffer < (2u + 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:
p_access->info.b_eof = true;
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.
*/
static inline bool rtp_ChainInsert( access_t *p_access, block_t *p_block )
{
access_sys_t *p_sys = (access_sys_t *) p_access->p_sys;
block_t *p_prev = NULL;
block_t *p = p_sys->p_end;
uint16_t i_new = (uint16_t) p_block->i_dts;
uint16_t i_tmp = 0;
if( !p_sys->p_list )
{
p_sys->p_list = p_block;
p_sys->p_end = p_block;
return true;
}
/* walk through the queue from top down since the new packet is in
most cases just appended to the end */
for( ;; )
{
i_tmp = i_new - (uint16_t) p->i_dts;
if( !i_tmp ) /* trash duplicate */
break;
if ( i_tmp < 32768 )
{ /* insert after this block ( i_new > p->i_dts ) */
p_block->p_next = p->p_next;
p->p_next = p_block;
p_block->p_prev = p;
if (p_prev)
{
p_prev->p_prev = p_block;
msg_Dbg(p_access, "RTP reordering: insert after %d, new %d",
(uint16_t) p->i_dts, i_new );
}
else
{
p_sys->p_end = p_block;
}
return true;
}
if( p == p_sys->p_list )
{ /* we've reached bottom of chain */
i_tmp = p_sys->i_last_seqno - i_new;
if( !p_access->info.b_prebuffered || (i_tmp > 32767) )
{
msg_Dbg(p_access, "RTP reordering: prepend %d before %d",
i_new, (uint16_t) p->i_dts );
p_block->p_next = p;
p->p_prev = p_block;
p_sys->p_list = p_block;
return true;
}
if( !i_tmp ) /* trash duplicate */
break;
/* reordering failed - append the packet to the end of queue */
msg_Dbg(p_access, "RTP: sequence changed (or buffer too small) "
"new: %d, buffer %d...%d", i_new, (uint16_t) p->i_dts,
(uint16_t) p_sys->p_end->i_dts);
p_sys->p_end->p_next = p_block;
p_block->p_prev = p_sys->p_end;
p_sys->p_end = p_block;
return true;
}
p_prev = p;
p = p->p_prev;
}
block_Release( p_block );
return false;
}
/*****************************************************************************
* BlockParseRTP: decapsulate the RTP packet and return it
*****************************************************************************/
static block_t *BlockParseRTP( access_t *p_access, block_t *p_block )
{
int i_payload_type;
size_t i_skip = RTP_HEADER_LEN;
if( p_block == NULL )
return NULL;
if( p_block->i_buffer < RTP_HEADER_LEN )
{
msg_Dbg( p_access, "short RTP packet received" );
goto trash;
}
/* Parse the header and make some verifications.
* See RFC 3550. */
// Version number:
if( ( p_block->p_buffer[0] >> 6 ) != 2)
{
msg_Dbg( p_access, "RTP version is %u instead of 2",
p_block->p_buffer[0] >> 6 );
goto trash;
}
// Padding bit:
uint8_t pad = (p_block->p_buffer[0] & 0x20)
? p_block->p_buffer[p_block->i_buffer - 1] : 0;
// CSRC count:
i_skip += (p_block->p_buffer[0] & 0x0F) * 4;
// Extension header:
if (p_block->p_buffer[0] & 0x10) /* Extension header */
{
i_skip += 4;
if ((size_t)p_block->i_buffer < i_skip)
goto trash;
i_skip += 4 * GetWBE( p_block->p_buffer + i_skip - 2 );
}
i_payload_type = p_block->p_buffer[1] & 0x7F;
/* Remember sequence number in i_dts */
p_block->i_pts = mdate();
p_block->i_dts = (mtime_t) GetWBE( p_block->p_buffer + 2 );
/* FIXME: use rtpmap */
const char *psz_demux = NULL;
switch( i_payload_type )
{
case 14: // MPA: MPEG Audio (RFC2250, §3.4)
i_skip += 4; // 32 bits RTP/MPA header
psz_demux = "mpga";
break;
case 32: // MPV: MPEG Video (RFC2250, §3.5)
i_skip += 4; // 32 bits RTP/MPV header
if( (size_t)p_block->i_buffer < i_skip )
goto trash;
if( p_block->p_buffer[i_skip - 3] & 0x4 )
{
/* MPEG2 Video extension header */
/* TODO: shouldn't we skip this too ? */
}
psz_demux = "mpgv";
break;
case 33: // MP2: MPEG TS (RFC2250, §2)
/* plain TS over RTP */
psz_demux = "ts";
break;
case 72: /* muxed SR */
case 73: /* muxed RR */
case 74: /* muxed SDES */
case 75: /* muxed BYE */
case 76: /* muxed APP */
goto trash; /* ooh! ignoring RTCP is evil! */
default:
msg_Dbg( p_access, "unsupported RTP payload type: %u", i_payload_type );
goto trash;
}
if( (size_t)p_block->i_buffer < (i_skip + pad) )
goto trash;
/* Remove the RTP header */
p_block->i_buffer -= i_skip;
p_block->p_buffer += i_skip;
/* This is the place for deciphering and authentication */
/* Remove padding (at the end) */
p_block->i_buffer -= pad;
#if 0
/* Emulate packet loss */
if ( (i_sequence_number % 4000) == 0)
{
msg_Warn( p_access, "Emulating packet drop" );
block_Release( p_block );
return NULL;
}
#endif
if( !p_access->psz_demux || !*p_access->psz_demux )
{
free( p_access->psz_demux );
p_access->psz_demux = strdup( psz_demux );
}
return p_block;
trash:
block_Release( p_block );
return NULL;
}
/*****************************************************************************
* BlockRTP: receives an RTP packet, parses it, queues it queue,
* then dequeues the oldest packet and returns it to input/demux.
****************************************************************************/
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 ||
( mdate() - p_sys->p_list->i_pts ) < p_sys->i_rtp_late )
{
p = BlockParseRTP( p_access,
p_sys->b_framed_rtp ? BlockTCP( p_access )
: BlockUDP( p_access ) );
if ( !p )
return NULL;
rtp_ChainInsert( p_access, p );
}
p = p_sys->p_list;
p_sys->p_list = p_sys->p_list->p_next;
p_sys->i_last_seqno++;
if( p_sys->i_last_seqno != (uint16_t) p->i_dts )
{
msg_Dbg( p_access, "RTP: packet(s) lost, expected %d, got %d",
p_sys->i_last_seqno, (uint16_t) p->i_dts );
p_sys->i_last_seqno = (uint16_t) p->i_dts;
}
p->p_next = NULL;
return p;
}
/*****************************************************************************
* BlockPrebufferRTP: waits until we have at least two RTP datagrams,
* so that we can synchronize the RTP sequence number.
* This is only useful for non-reliable transport protocols.
****************************************************************************/
static block_t *BlockPrebufferRTP( access_t *p_access, block_t *p_block )
{
access_sys_t *p_sys = p_access->p_sys;
mtime_t i_first = mdate();
int i_count = 0;
block_t *p = p_block;
if( BlockParseRTP( p_access, p_block ) == NULL )
return NULL;
for( ;; )
{
mtime_t i_date = mdate();
if( p && rtp_ChainInsert( p_access, p ))
i_count++;
/* Require at least 2 packets in the buffer */
if( i_count > 2 && (i_date - i_first) > p_sys->i_rtp_late )
break;
p = BlockParseRTP( p_access, BlockUDP( p_access ) );
if( !p && (i_date - i_first) > p_sys->i_rtp_late )
{
msg_Err( p_access, "error in RTP prebuffering!" );
return NULL;
}
}
msg_Dbg( p_access, "RTP: prebuffered %d packets", i_count - 1 );
p_access->info.b_prebuffered = true;
p = p_sys->p_list;
p_sys->p_list = p_sys->p_list->p_next;
p_sys->i_last_seqno = (uint16_t) p->i_dts;
p->p_next = NULL;
return p;
}
static block_t *BlockStartRTP( access_t *p_access )
{
p_access->pf_block = BlockRTP;
return BlockPrebufferRTP( p_access, BlockUDP( p_access ) );
}
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