X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=modules%2Faccess%2Fudp.c;h=d243a290eac32e8dbdfd9159b0651d5c81fd3a5d;hb=295b0e07523b7e9daf6c7ed76eec02d2dcfd80f0;hp=401acfaa6dcff48a36fe05b64928a2669ea960c5;hpb=c26261bf473f3ffdb8777132b1bf82817c3ece84;p=vlc diff --git a/modules/access/udp.c b/modules/access/udp.c index 401acfaa6d..d243a290ea 100644 --- a/modules/access/udp.c +++ b/modules/access/udp.c @@ -1,5 +1,5 @@ /***************************************************************************** - * 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 @@ -23,9 +23,9 @@ * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. + * 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., + * 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. *****************************************************************************/ /***************************************************************************** @@ -51,34 +51,24 @@ "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_category( CAT_INPUT ); - set_subcategory( SUBCAT_INPUT_ACCESS ); +vlc_module_begin () + 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_bool( "udp-auto-mtu" ); + CACHING_LONGTEXT, true ) + change_safe() - set_capability( "access", 0 ); - add_shortcut( "udp" ); - add_shortcut( "udpstream" ); - add_shortcut( "udp4" ); - add_shortcut( "udp6" ); - add_shortcut( "rtptcp" ); /* tcp name is already taken */ + set_capability( "access", 0 ) + add_shortcut( "udp", "udpstream", "udp4", "udp6" ) - set_callbacks( Open, Close ); -vlc_module_end(); + set_callbacks( Open, Close ) +vlc_module_end () /***************************************************************************** * Local prototypes @@ -86,45 +76,25 @@ 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 block_t *BlockChoose( 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_name = strdup( p_access->psz_location ); 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 ); - 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)); + ACCESS_SET_CALLBACKS( NULL, BlockUDP, Control, NULL ); if (strlen (p_access->psz_access) > 0) { @@ -138,15 +108,9 @@ 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 = BlockChoose; - else - if (strcmp (p_access->psz_access, "rtptcp") == 0) - proto = IPPROTO_TCP; } - i_bind_port = var_CreateGetInteger( p_access, "server-port" ); + i_bind_port = var_InheritInteger( p_access, "server-port" ); /* Parse psz_name syntax : * [serveraddr[:serverport]][@[bindaddr]:[bindport]] */ @@ -190,40 +154,18 @@ 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; } @@ -233,11 +175,8 @@ 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 ); } /***************************************************************************** @@ -245,9 +184,8 @@ static void Close( vlc_object_t *p_this ) *****************************************************************************/ static int Control( access_t *p_access, int i_query, va_list args ) { - bool *pb_bool; - int *pi_int; - int64_t *pi_64; + bool *pb_bool; + int64_t *pi_64; switch( i_query ) { @@ -260,14 +198,9 @@ static int Control( access_t *p_access, int i_query, va_list args ) *pb_bool = false; break; /* */ - case ACCESS_GET_MTU: - pi_int = (int*)va_arg( args, int * ); - *pi_int = 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; + *pi_64 = var_GetInteger(p_access,"udp-caching") * 1000; break; /* */ @@ -301,432 +234,13 @@ 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 ) ); -} - - -/***************************************************************************** - * BlockChoose: decide between RTP and UDP - *****************************************************************************/ -static block_t *BlockChoose( access_t *p_access ) -{ - block_t *p_block; - int i_rtp_version; - 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; - p_access->info.b_prebuffered = true; - return p_block; - } - - if( p_block->i_buffer < RTP_HEADER_LEN ) - return p_block; - - /* Parse the header and make some verifications. - * See RFC 3550. */ - - i_rtp_version = p_block->p_buffer[0] >> 6; - 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; - p_access->info.b_prebuffered = true; - return p_block; - } - - switch( i_payload_type ) - { - case 33: - msg_Dbg( p_access, "detected MPEG2 TS over RTP" ); - free( p_access->psz_demux ); - p_access->psz_demux = strdup( "ts" ); - break; - - case 14: - msg_Dbg( p_access, "detected MPEG Audio over RTP" ); - free( p_access->psz_demux ); - p_access->psz_demux = strdup( "mpga" ); - break; - - case 32: - msg_Dbg( p_access, "detected MPEG Video over RTP" ); - free( p_access->psz_demux ); - p_access->psz_demux = strdup( "mpgv" ); - break; - - default: - msg_Dbg( p_access, "no RTP header detected" ); - p_access->pf_block = BlockUDP; - p_access->info.b_prebuffered = true; - return p_block; - } - - p_access->pf_block = BlockRTP; - return BlockPrebufferRTP( p_access, p_block ); + return block_Realloc( p_block, 0, len ); }