1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2001-2007 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8 * Eric Petit <titer@videolan.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
30 #include <sys/types.h>
38 #include <vlc_block.h>
45 # include <winsock2.h>
46 # include <ws2tcpip.h>
48 # include <sys/socket.h>
51 #include <vlc_network.h>
53 #if defined (HAVE_NETINET_UDPLITE_H)
54 # include <netinet/udplite.h>
55 #elif defined (__linux__)
56 # define UDPLITE_SEND_CSCOV 10
57 # define UDPLITE_RECV_CSCOV 11
60 #ifndef IPPROTO_UDPLITE
61 # define IPPROTO_UDPLITE 136 /* from IANA */
64 # define SOL_UDPLITE IPPROTO_UDPLITE
67 #define MAX_EMPTY_BLOCKS 200
69 #if defined(WIN32) || defined(UNDER_CE)
70 # define WINSOCK_STRERROR_SIZE 20
71 static const char *winsock_strerror( char *buf )
73 snprintf( buf, WINSOCK_STRERROR_SIZE, "Winsock error %d",
75 buf[WINSOCK_STRERROR_SIZE - 1] = '\0';
80 /*****************************************************************************
82 *****************************************************************************/
83 static int Open ( vlc_object_t * );
84 static void Close( vlc_object_t * );
86 #define SOUT_CFG_PREFIX "sout-udp-"
88 #define CACHING_TEXT N_("Caching value (ms)")
89 #define CACHING_LONGTEXT N_( \
90 "Default caching value for outbound UDP streams. This " \
91 "value should be set in milliseconds." )
93 #define GROUP_TEXT N_("Group packets")
94 #define GROUP_LONGTEXT N_("Packets can be sent one by one at the right time " \
95 "or by groups. You can choose the number " \
96 "of packets that will be sent at a time. It " \
97 "helps reducing the scheduling load on " \
98 "heavily-loaded systems." )
99 #define RAW_TEXT N_("Raw write")
100 #define RAW_LONGTEXT N_("Packets will be sent " \
101 "directly, without trying to fill the MTU (ie, " \
102 "without trying to make the biggest possible packets " \
103 "in order to improve streaming)." )
104 #define RTCP_TEXT N_("RTCP Sender Report")
105 #define RTCP_LONGTEXT N_("Send RTCP Sender Report packets")
106 #define RTCP_PORT_TEXT N_("RTCP destination port number")
107 #define RTCP_PORT_LONGTEXT N_("Sends RTCP packets to this port (0 = auto)")
108 #define AUTO_MCAST_TEXT N_("Automatic multicast streaming")
109 #define AUTO_MCAST_LONGTEXT N_("Allocates an outbound multicast address " \
111 #define UDPLITE_TEXT N_("UDP-Lite")
112 #define UDPLITE_LONGTEXT N_("Use UDP-Lite/IP instead of normal UDP/IP")
113 #define CSCOV_TEXT N_("Checksum coverage")
114 #define CSCOV_LONGTEXT N_("Payload bytes covered by layer-4 checksum")
117 set_description( _("UDP stream output") );
118 set_shortname( "UDP" );
119 set_category( CAT_SOUT );
120 set_subcategory( SUBCAT_SOUT_ACO );
121 add_integer( SOUT_CFG_PREFIX "caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT, CACHING_LONGTEXT, VLC_TRUE );
122 add_integer( SOUT_CFG_PREFIX "group", 1, NULL, GROUP_TEXT, GROUP_LONGTEXT,
124 add_obsolete_integer( SOUT_CFG_PREFIX "late" );
125 add_bool( SOUT_CFG_PREFIX "raw", VLC_FALSE, NULL, RAW_TEXT, RAW_LONGTEXT,
127 add_bool( SOUT_CFG_PREFIX "rtcp", VLC_FALSE, NULL, RAW_TEXT, RAW_LONGTEXT,
129 add_integer( SOUT_CFG_PREFIX "rtcp-port", 0, NULL, RTCP_PORT_TEXT,
130 RTCP_PORT_LONGTEXT, VLC_TRUE );
131 add_bool( SOUT_CFG_PREFIX "auto-mcast", VLC_FALSE, NULL, AUTO_MCAST_TEXT,
132 AUTO_MCAST_LONGTEXT, VLC_TRUE );
133 add_bool( SOUT_CFG_PREFIX "udplite", VLC_FALSE, NULL, UDPLITE_TEXT, UDPLITE_LONGTEXT, VLC_TRUE );
134 add_integer( SOUT_CFG_PREFIX "cscov", 12, NULL, CSCOV_TEXT, CSCOV_LONGTEXT, VLC_TRUE );
136 set_capability( "sout access", 100 );
137 add_shortcut( "udp" );
138 add_shortcut( "rtp" ); // Will work only with ts muxer
139 set_callbacks( Open, Close );
142 /*****************************************************************************
143 * Exported prototypes
144 *****************************************************************************/
146 static const char *const ppsz_sout_options[] = {
158 /* Options handled by the libvlc network core */
159 static const char *const ppsz_core_options[] = {
167 static int Write ( sout_access_out_t *, block_t * );
168 static int WriteRaw( sout_access_out_t *, block_t * );
169 static int Seek ( sout_access_out_t *, off_t );
171 static void ThreadWrite( vlc_object_t * );
172 static block_t *NewUDPPacket( sout_access_out_t *, mtime_t );
173 static const char *MakeRandMulticast (int family, char *buf, size_t buflen);
175 typedef struct sout_access_thread_t
179 sout_instance_t *p_sout;
181 block_fifo_t *p_fifo;
188 block_fifo_t *p_empty_blocks;
194 uint8_t rtcp_data[28 + 8 + (2 * 257)];
196 } sout_access_thread_t;
198 struct sout_access_out_sys_t
202 vlc_bool_t b_rtpts; // true for RTP/MP2 encapsulation
203 vlc_bool_t b_mtu_warning;
204 uint16_t i_sequence_number;
209 sout_access_thread_t *p_thread;
213 #define DEFAULT_PORT 1234
214 #define RTP_HEADER_LENGTH 12
216 static int OpenRTCP (sout_access_out_t *obj, int proto, uint16_t dport);
217 static void SendRTCP (sout_access_thread_t *obj, uint32_t timestamp);
218 static void CloseRTCP (sout_access_thread_t *obj);
220 /*****************************************************************************
221 * Open: open the file
222 *****************************************************************************/
223 static int Open( vlc_object_t *p_this )
225 sout_access_out_t *p_access = (sout_access_out_t*)p_this;
226 sout_access_out_sys_t *p_sys;
228 char *psz_dst_addr = NULL;
229 int i_dst_port, i_rtcp_port = 0, proto = IPPROTO_UDP;
230 const char *protoname = "UDP";
234 config_ChainParse( p_access, SOUT_CFG_PREFIX,
235 ppsz_sout_options, p_access->p_cfg );
236 config_ChainParse( p_access, "",
237 ppsz_core_options, p_access->p_cfg );
239 if (var_Create (p_access, "dst-port", VLC_VAR_INTEGER)
240 || var_Create (p_access, "src-port", VLC_VAR_INTEGER)
241 || var_Create (p_access, "dst-addr", VLC_VAR_STRING)
242 || var_Create (p_access, "src-addr", VLC_VAR_STRING))
247 if( !( p_sys = calloc ( 1, sizeof( sout_access_out_sys_t ) ) ) )
249 msg_Err( p_access, "not enough memory" );
252 p_access->p_sys = p_sys;
254 if( p_access->psz_access != NULL )
256 if (strcmp (p_access->psz_access, "rtp") == 0)
257 p_sys->b_rtpts = VLC_TRUE;
260 if (var_GetBool (p_access, SOUT_CFG_PREFIX"lite"))
262 protoname = "UDP-Lite";
263 proto = IPPROTO_UDPLITE;
266 i_dst_port = DEFAULT_PORT;
267 if (var_GetBool (p_access, SOUT_CFG_PREFIX"auto-mcast"))
269 char buf[INET6_ADDRSTRLEN];
270 if (MakeRandMulticast (AF_INET, buf, sizeof (buf)) != NULL)
271 psz_dst_addr = strdup (buf);
275 char *psz_parser = psz_dst_addr = strdup( p_access->psz_path );
277 if (psz_parser[0] == '[')
278 psz_parser = strchr (psz_parser, ']');
280 psz_parser = strchr (psz_parser ?: psz_dst_addr, ':');
281 if (psz_parser != NULL)
283 *psz_parser++ = '\0';
284 i_dst_port = atoi (psz_parser);
288 if (var_GetBool (p_access, SOUT_CFG_PREFIX"rtcp"))
290 /* This is really only for the RTP sout plugin.
291 * Doing RTCP for non RTP packet is NOT a good idea. */
292 i_rtcp_port = var_GetInteger (p_access, SOUT_CFG_PREFIX"rtcp-port");
293 if (i_rtcp_port == 0)
294 i_rtcp_port = i_dst_port + 1;
298 vlc_object_create( p_access, sizeof( sout_access_thread_t ) );
299 if( !p_sys->p_thread )
301 msg_Err( p_access, "out of memory" );
307 vlc_object_attach( p_sys->p_thread, p_access );
308 p_sys->p_thread->p_sout = p_access->p_sout;
309 p_sys->p_thread->b_die = 0;
310 p_sys->p_thread->b_error= 0;
311 p_sys->p_thread->p_fifo = block_FifoNew( p_access );
312 p_sys->p_thread->p_empty_blocks = block_FifoNew( p_access );
314 i_handle = net_ConnectDgram( p_this, psz_dst_addr, i_dst_port, -1, proto );
319 msg_Err( p_access, "failed to create %s socket", protoname );
320 vlc_object_destroy (p_sys->p_thread);
326 char addr[NI_MAXNUMERICHOST];
329 if (net_GetSockAddress (i_handle, addr, &port) == 0)
331 msg_Dbg (p_access, "source: %s port %d", addr, port);
332 var_SetString (p_access, "src-addr", addr);
333 var_SetInteger (p_access, "src-port", port);
336 if (net_GetPeerAddress (i_handle, addr, &port) == 0)
338 msg_Dbg (p_access, "destination: %s port %d", addr, port);
339 var_SetString (p_access, "dst-addr", addr);
340 var_SetInteger (p_access, "dst-port", port);
343 p_sys->p_thread->i_handle = i_handle;
344 shutdown( i_handle, SHUT_RD );
346 int cscov = var_GetInteger (p_access, SOUT_CFG_PREFIX"cscov");
351 #ifdef UDPLITE_SEND_CSCOV
352 case IPPROTO_UDPLITE:
354 setsockopt (i_handle, SOL_UDPLITE, UDPLITE_SEND_CSCOV,
355 &(int){ cscov }, sizeof (cscov));
358 #ifdef DCCP_SOCKOPT_RECV_CSCOV
359 /* FIXME: ^^is this the right name ? */
360 /* FIXME: is this inherited by accept() ? */
362 cscov = ((cscov + 3) >> 2) + 1;
364 break; /* out of DCCP cscov range */
365 setsockopt (i_handle, SOL_DCCP, DCCP_SOCKOPT_RECV_CSCOV,
366 &(int){ cscov }, sizeof (cscov));
372 p_sys->p_thread->i_caching =
373 (int64_t)1000 * var_GetInteger( p_access, SOUT_CFG_PREFIX "caching");
374 p_sys->p_thread->i_group =
375 var_GetInteger( p_access, SOUT_CFG_PREFIX "group" );
377 p_sys->i_mtu = var_GetInteger( p_this, "mtu" );
379 srand( (uint32_t)mdate());
380 p_sys->p_buffer = NULL;
381 p_sys->i_sequence_number = rand()&0xffff;
382 p_sys->i_ssrc = rand()&0xffffffff;
384 if (i_rtcp_port && OpenRTCP (p_access, proto, i_rtcp_port))
386 msg_Err (p_access, "cannot initialize RTCP sender");
387 net_Close (i_handle);
388 vlc_object_destroy (p_sys->p_thread);
393 if( vlc_thread_create( p_sys->p_thread, "sout write thread", ThreadWrite,
394 VLC_THREAD_PRIORITY_HIGHEST, VLC_FALSE ) )
396 msg_Err( p_access->p_sout, "cannot spawn sout access thread" );
397 net_Close (i_handle);
398 vlc_object_destroy( p_sys->p_thread );
403 if (var_GetBool (p_access, SOUT_CFG_PREFIX"raw"))
404 p_access->pf_write = WriteRaw;
406 p_access->pf_write = Write;
408 p_access->pf_seek = Seek;
410 /* update p_sout->i_out_pace_nocontrol */
411 p_access->p_sout->i_out_pace_nocontrol++;
416 /*****************************************************************************
417 * Close: close the target
418 *****************************************************************************/
419 static void Close( vlc_object_t * p_this )
421 sout_access_out_t *p_access = (sout_access_out_t*)p_this;
422 sout_access_out_sys_t *p_sys = p_access->p_sys;
425 vlc_object_kill( p_sys->p_thread );
426 for( i = 0; i < 10; i++ )
428 block_t *p_dummy = block_New( p_access, p_sys->i_mtu );
431 p_dummy->i_length = 0;
432 memset( p_dummy->p_buffer, 0, p_dummy->i_buffer );
433 block_FifoPut( p_sys->p_thread->p_fifo, p_dummy );
435 vlc_thread_join( p_sys->p_thread );
437 block_FifoRelease( p_sys->p_thread->p_fifo );
438 block_FifoRelease( p_sys->p_thread->p_empty_blocks );
440 if( p_sys->p_buffer ) block_Release( p_sys->p_buffer );
442 net_Close( p_sys->p_thread->i_handle );
443 CloseRTCP (p_sys->p_thread);
445 vlc_object_detach( p_sys->p_thread );
446 vlc_object_destroy( p_sys->p_thread );
447 /* update p_sout->i_out_pace_nocontrol */
448 p_access->p_sout->i_out_pace_nocontrol--;
450 msg_Dbg( p_access, "UDP access output closed" );
454 /*****************************************************************************
455 * Write: standard write on a file descriptor.
456 *****************************************************************************/
457 static int Write( sout_access_out_t *p_access, block_t *p_buffer )
459 sout_access_out_sys_t *p_sys = p_access->p_sys;
466 mtime_t now = mdate();
468 if( !p_sys->b_mtu_warning && p_buffer->i_buffer > p_sys->i_mtu )
470 msg_Warn( p_access, "packet size > MTU, you should probably "
471 "increase the MTU" );
472 p_sys->b_mtu_warning = VLC_TRUE;
475 /* Check if there is enough space in the buffer */
476 if( p_sys->p_buffer &&
477 p_sys->p_buffer->i_buffer + p_buffer->i_buffer > p_sys->i_mtu )
479 if( p_sys->p_buffer->i_dts + p_sys->p_thread->i_caching < now )
481 msg_Dbg( p_access, "late packet for UDP input (" I64Fd ")",
482 now - p_sys->p_buffer->i_dts
483 - p_sys->p_thread->i_caching );
485 block_FifoPut( p_sys->p_thread->p_fifo, p_sys->p_buffer );
486 p_sys->p_buffer = NULL;
489 i_len += p_buffer->i_buffer;
490 while( p_buffer->i_buffer )
492 int i_payload_size = p_sys->i_mtu;
494 i_payload_size -= RTP_HEADER_LENGTH;
496 int i_write = __MIN( p_buffer->i_buffer, i_payload_size );
500 if( !p_sys->p_buffer )
502 p_sys->p_buffer = NewUDPPacket( p_access, p_buffer->i_dts );
503 if( !p_sys->p_buffer ) break;
506 memcpy( p_sys->p_buffer->p_buffer + p_sys->p_buffer->i_buffer,
507 p_buffer->p_buffer, i_write );
509 p_sys->p_buffer->i_buffer += i_write;
510 p_buffer->p_buffer += i_write;
511 p_buffer->i_buffer -= i_write;
512 if ( p_buffer->i_flags & BLOCK_FLAG_CLOCK )
514 if ( p_sys->p_buffer->i_flags & BLOCK_FLAG_CLOCK )
515 msg_Warn( p_access, "putting two PCRs at once" );
516 p_sys->p_buffer->i_flags |= BLOCK_FLAG_CLOCK;
519 if( p_sys->p_buffer->i_buffer == p_sys->i_mtu || i_packets > 1 )
522 if( p_sys->p_buffer->i_dts + p_sys->p_thread->i_caching < now )
524 msg_Dbg( p_access, "late packet for udp input (" I64Fd ")",
525 mdate() - p_sys->p_buffer->i_dts
526 - p_sys->p_thread->i_caching );
528 block_FifoPut( p_sys->p_thread->p_fifo, p_sys->p_buffer );
529 p_sys->p_buffer = NULL;
533 p_next = p_buffer->p_next;
534 block_Release( p_buffer );
538 return( p_sys->p_thread->b_error ? -1 : i_len );
541 /*****************************************************************************
542 * WriteRaw: write p_buffer without trying to fill mtu
543 *****************************************************************************/
544 static int WriteRaw( sout_access_out_t *p_access, block_t *p_buffer )
546 sout_access_out_sys_t *p_sys = p_access->p_sys;
550 while ( p_sys->p_thread->p_empty_blocks->i_depth >= MAX_EMPTY_BLOCKS )
552 p_buf = block_FifoGet(p_sys->p_thread->p_empty_blocks);
553 block_Release( p_buf );
556 i_len = p_buffer->i_buffer;
557 block_FifoPut( p_sys->p_thread->p_fifo, p_buffer );
559 return( p_sys->p_thread->b_error ? -1 : i_len );
562 /*****************************************************************************
563 * Seek: seek to a specific location in a file
564 *****************************************************************************/
565 static int Seek( sout_access_out_t *p_access, off_t i_pos )
567 msg_Err( p_access, "UDP sout access cannot seek" );
571 /*****************************************************************************
572 * NewUDPPacket: allocate a new UDP packet of size p_sys->i_mtu
573 *****************************************************************************/
574 static block_t *NewUDPPacket( sout_access_out_t *p_access, mtime_t i_dts)
576 sout_access_out_sys_t *p_sys = p_access->p_sys;
579 while ( p_sys->p_thread->p_empty_blocks->i_depth > MAX_EMPTY_BLOCKS )
581 p_buffer = block_FifoGet( p_sys->p_thread->p_empty_blocks );
582 block_Release( p_buffer );
585 if( p_sys->p_thread->p_empty_blocks->i_depth == 0 )
587 p_buffer = block_New( p_access->p_sout, p_sys->i_mtu );
591 p_buffer = block_FifoGet(p_sys->p_thread->p_empty_blocks );
592 p_buffer->i_flags = 0;
593 p_buffer = block_Realloc( p_buffer, 0, p_sys->i_mtu );
596 p_buffer->i_dts = i_dts;
597 p_buffer->i_buffer = 0;
601 mtime_t i_timestamp = p_buffer->i_dts * 9 / 100;
603 /* add rtp/ts header */
604 p_buffer->p_buffer[0] = 0x80;
605 p_buffer->p_buffer[1] = 33; // mpeg2-ts
607 SetWBE( p_buffer->p_buffer + 2, p_sys->i_sequence_number );
608 p_sys->i_sequence_number++;
609 SetDWBE( p_buffer->p_buffer + 4, i_timestamp );
610 SetDWBE( p_buffer->p_buffer + 8, p_sys->i_ssrc );
612 p_buffer->i_buffer = RTP_HEADER_LENGTH;
618 /*****************************************************************************
619 * ThreadWrite: Write a packet on the network at the good time.
620 *****************************************************************************/
621 static void ThreadWrite( vlc_object_t *p_this )
623 sout_access_thread_t *p_thread = (sout_access_thread_t*)p_this;
624 mtime_t i_date_last = -1;
625 mtime_t i_to_send = p_thread->i_group;
626 int i_dropped_packets = 0;
627 #if defined(WIN32) || defined(UNDER_CE)
628 char strerror_buf[WINSOCK_STRERROR_SIZE];
629 # define strerror( x ) winsock_strerror( strerror_buf )
631 size_t rtcp_counter = 0;
633 while( !p_thread->b_die )
636 mtime_t i_date, i_sent;
638 if( (i++ % 1000)==0 ) {
641 block_t *p_tmp = p_thread->p_empty_blocks->p_first;
642 while( p_tmp ) { p_tmp = p_tmp->p_next; i++;}
643 p_tmp = p_thread->p_fifo->p_first;
644 while( p_tmp ) { p_tmp = p_tmp->p_next; j++;}
645 msg_Dbg( p_thread, "fifo depth: %d/%d, empty blocks: %d/%d",
646 p_thread->p_fifo->i_depth, j,p_thread->p_empty_blocks->i_depth,i );
649 p_pk = block_FifoGet( p_thread->p_fifo );
651 i_date = p_thread->i_caching + p_pk->i_dts;
652 if( i_date_last > 0 )
654 if( i_date - i_date_last > 2000000 )
656 if( !i_dropped_packets )
657 msg_Dbg( p_thread, "mmh, hole ("I64Fd" > 2s) -> drop",
658 i_date - i_date_last );
660 block_FifoPut( p_thread->p_empty_blocks, p_pk );
662 i_date_last = i_date;
666 else if( i_date - i_date_last < -1000 )
668 if( !i_dropped_packets )
669 msg_Dbg( p_thread, "mmh, packets in the past ("I64Fd")",
670 i_date_last - i_date );
675 if( !i_to_send || (p_pk->i_flags & BLOCK_FLAG_CLOCK) )
678 i_to_send = p_thread->i_group;
680 ssize_t val = send( p_thread->i_handle, p_pk->p_buffer,
684 msg_Warn( p_thread, "send error: %s", strerror(errno) );
688 p_thread->sent_pkts++;
689 p_thread->sent_bytes += val;
693 if( i_dropped_packets )
695 msg_Dbg( p_thread, "dropped %i packets", i_dropped_packets );
696 i_dropped_packets = 0;
701 if ( i_sent > i_date + 20000 )
703 msg_Dbg( p_thread, "packet has been sent too late (" I64Fd ")",
708 if ((p_thread->rtcp_handle != -1) && (p_pk->i_buffer >= 8))
709 { // 1.25% rate limit:
710 if ((rtcp_counter / 80) >= p_thread->rtcp_size)
712 SendRTCP (p_thread, GetDWBE (p_pk->p_buffer + 4));
717 block_FifoPut( p_thread->p_empty_blocks, p_pk );
719 i_date_last = i_date;
724 static const char *MakeRandMulticast (int family, char *buf, size_t buflen)
726 uint32_t rand = (getpid() & 0xffff)
727 | (uint32_t)(((mdate () >> 10) & 0xffff) << 16);
734 struct in6_addr addr;
735 memcpy (&addr, "\xff\x38\x00\x00" "\x00\x00\x00\x00"
736 "\x00\x00\x00\x00", 12);
738 memcpy (addr.s6_addr + 12, &(uint32_t){ htonl (rand) }, 4);
739 return inet_ntop (family, &addr, buf, buflen);
746 addr.s_addr = htonl ((rand & 0xffffff) | 0xe8000000);
747 return inet_ntop (family, &addr, buf, buflen);
751 errno = EAFNOSUPPORT;
758 * NOTE on RTCP implementation:
759 * - there is a single sender (us), no conferencing here! => n = sender = 1,
760 * - as such we need not bother to include Receiver Reports,
761 * - in unicast case, there is a single receiver => members = 1 + 1 = 2,
762 * and obviously n > 25% of members,
763 * - in multicast case, we do not want to maintain the number of receivers
764 * and we assume it is big (i.e. than 3) because that's what broadcasting is
766 * - it is assumed we_sent = true (could be wrong), since we are THE sender,
767 * - we always send SR + SDES, while running,
768 * - FIXME: we do not implement separate rate limiting for SDES,
769 * - we do not implement any profile-specific extensions for the time being.
771 static int OpenRTCP (sout_access_out_t *obj, int proto, uint16_t dport)
773 sout_access_out_sys_t *p_sys = obj->p_sys;
777 char src[NI_MAXNUMERICHOST], dst[NI_MAXNUMERICHOST];
780 fd = obj->p_sys->p_thread->i_handle;
781 if (net_GetSockAddress (fd, src, &sport)
782 || net_GetPeerAddress (fd, dst, NULL))
786 fd = net_OpenDgram (obj, src, sport, dst, dport, AF_UNSPEC, proto);
790 obj->p_sys->p_thread->rtcp_handle = fd;
792 ptr = (uint8_t *)strchr (src, '%');
794 *ptr = '\0'; /* remove scope ID frop IPv6 addresses */
796 ptr = obj->p_sys->p_thread->rtcp_data;
799 ptr[0] = 2 << 6; /* V = 2, P = RC = 0 */
800 ptr[1] = 200; /* payload type: Sender Report */
801 SetWBE (ptr + 2, 6); /* length = 6 (7 double words) */
802 SetDWBE (ptr + 4, p_sys->i_ssrc);
803 SetQWBE (ptr + 8, NTPtime64 ());
805 /* timestamp and counter are handled later */
807 /* Source description */
809 ptr[0] = (2 << 6) | 1; /* V = 2, P = 0, SC = 1 */
810 ptr[1] = 202; /* payload type: Source Description */
811 uint8_t *lenptr = ptr + 2;
812 SetDWBE (ptr + 4, p_sys->i_ssrc);
815 ptr[0] = 1; /* CNAME - mandatory */
816 assert (NI_MAXNUMERICHOST <= 256);
817 ptr[1] = strlen (src);
818 memcpy (ptr + 2, src, ptr[1]);
821 static const char tool[] = PACKAGE_STRING;
822 ptr[0] = 6; /* TOOL */
823 ptr[1] = (sizeof (tool) > 256) ? 255 : (sizeof (tool) - 1);
824 memcpy (ptr + 2, tool, ptr[1]);
827 while ((ptr - sdes) & 3) /* 32-bits padding */
829 SetWBE (lenptr, ptr - sdes);
831 obj->p_sys->p_thread->rtcp_size = ptr - obj->p_sys->p_thread->rtcp_data;
835 static void CloseRTCP (sout_access_thread_t *obj)
837 if (obj->rtcp_handle == -1)
840 uint8_t *ptr = obj->rtcp_data;
842 ptr[0] = (2 << 6) | 1; /* V = 2, P = 0, SC = 1 */
843 ptr[1] = 203; /* payload type: Bye */
845 /* SSRC is already there :) */
847 /* We are THE sender, so we are more important than anybody else, so
848 * we can afford not to check bandwidth constraints here. */
849 send (obj->rtcp_handle, obj->rtcp_data, 8, 0);
850 net_Close (obj->rtcp_handle);
853 static void SendRTCP (sout_access_thread_t *obj, uint32_t timestamp)
855 uint8_t *ptr = obj->rtcp_data;
857 uint32_t last = GetDWBE (ptr + 8); // last RTCP SR send time
858 uint64_t now64 = NTPtime64 ();
859 if ((now64 >> 32) < (last + 5))
860 return; // no more than one SR every 5 seconds
862 SetQWBE (ptr + 8, now64);
863 SetDWBE (ptr + 16, timestamp);
864 SetDWBE (ptr + 20, obj->sent_pkts);
865 SetDWBE (ptr + 24, obj->sent_bytes);
867 send (obj->rtcp_handle, ptr, obj->rtcp_size, 0);