git.sesse.net Git - vlc/blob - modules/access_output/udp.c

   1 /*****************************************************************************
   2  * udp.c
   3  *****************************************************************************
   4  * Copyright (C) 2001-2005 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Eric Petit <titer@videolan.org>
   9  *
  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.
  14  *
  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.
  19  *
  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  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <stdlib.h>
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <string.h>
  32 #include <errno.h>
  33 #include <fcntl.h>
  34
  35 #include <vlc/vlc.h>
  36 #include <vlc/sout.h>
  37
  38 #ifdef HAVE_UNISTD_H
  39 #   include <unistd.h>
  40 #endif
  41
  42 #ifdef WIN32
  43 #   include <winsock2.h>
  44 #   include <ws2tcpip.h>
  45 #   ifndef IN_MULTICAST
  46 #       define IN_MULTICAST(a) IN_CLASSD(a)
  47 #   endif
  48 #else
  49 #   include <sys/socket.h>
  50 #endif
  51
  52 #include "network.h"
  53
  54 #define MAX_EMPTY_BLOCKS 200
  55
  56 #if defined(WIN32) || defined(UNDER_CE)
  57 # define WINSOCK_STRERROR_SIZE 20
  58 static const char *winsock_strerror( char *buf )
  59 {
  60     snprintf( buf, WINSOCK_STRERROR_SIZE, "Winsock error %d",
  61               WSAGetLastError( ) );
  62     buf[WINSOCK_STRERROR_SIZE - 1] = '\0';
  63     return buf;
  64 }
  65 #endif
  66
  67 /*****************************************************************************
  68  * Module descriptor
  69  *****************************************************************************/
  70 static int  Open ( vlc_object_t * );
  71 static void Close( vlc_object_t * );
  72
  73 #define SOUT_CFG_PREFIX "sout-udp-"
  74
  75 #define CACHING_TEXT N_("Caching value (ms)")
  76 #define CACHING_LONGTEXT N_( \
  77     "Default caching value for outbound UDP streams. This " \
  78     "value should be set in milliseconds." )
  79
  80 #define GROUP_TEXT N_("Group packets")
  81 #define GROUP_LONGTEXT N_("Packets can be sent one by one at the right time " \
  82                           "or by groups. You can choose the number " \
  83                           "of packets that will be sent at a time. It " \
  84                           "helps reducing the scheduling load on " \
  85                           "heavily-loaded systems." )
  86 #define RAW_TEXT N_("Raw write")
  87 #define RAW_LONGTEXT N_("Packets will be sent " \
  88                        "directly, without trying to fill the MTU (ie, " \
  89                        "without trying to make the biggest possible packets " \
  90                        "in order to improve streaming)." )
  91
  92 vlc_module_begin();
  93     set_description( _("UDP stream output") );
  94     set_shortname( "UDP" );
  95     set_category( CAT_SOUT );
  96     set_subcategory( SUBCAT_SOUT_ACO );
  97     add_integer( SOUT_CFG_PREFIX "caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT, CACHING_LONGTEXT, VLC_TRUE );
  98     add_integer( SOUT_CFG_PREFIX "group", 1, NULL, GROUP_TEXT, GROUP_LONGTEXT,
  99                                  VLC_TRUE );
 100     add_suppressed_integer( SOUT_CFG_PREFIX "late" );
 101     add_bool( SOUT_CFG_PREFIX "raw",  0, NULL, RAW_TEXT, RAW_LONGTEXT,
 102                                  VLC_TRUE );
 103
 104     set_capability( "sout access", 100 );
 105     add_shortcut( "udp" );
 106     add_shortcut( "rtp" ); // Will work only with ts muxer
 107     set_callbacks( Open, Close );
 108 vlc_module_end();
 109
 110 /*****************************************************************************
 111  * Exported prototypes
 112  *****************************************************************************/
 113
 114 static const char *ppsz_sout_options[] = {
 115     "caching",
 116     "group",
 117     "raw",
 118     NULL
 119 };
 120
 121 /* Options handled by the libvlc network core */
 122 static const char *ppsz_core_options[] = {
 123     "dscp",
 124     "ttl",
 125     "miface",
 126     "miface-addr",
 127     NULL
 128 };
 129
 130 static int  Write   ( sout_access_out_t *, block_t * );
 131 static int  WriteRaw( sout_access_out_t *, block_t * );
 132 static int  Seek    ( sout_access_out_t *, off_t  );
 133
 134 static void ThreadWrite( vlc_object_t * );
 135 static block_t *NewUDPPacket( sout_access_out_t *, mtime_t );
 136
 137 typedef struct sout_access_thread_t
 138 {
 139     VLC_COMMON_MEMBERS
 140
 141     sout_instance_t *p_sout;
 142
 143     block_fifo_t *p_fifo;
 144
 145     int         i_handle;
 146
 147     int64_t     i_caching;
 148     int         i_group;
 149
 150     block_fifo_t *p_empty_blocks;
 151
 152 } sout_access_thread_t;
 153
 154 struct sout_access_out_sys_t
 155 {
 156     int                 b_rtpts;  // 1 if add rtp/ts header
 157     uint16_t            i_sequence_number;
 158     uint32_t            i_ssrc;
 159
 160     int                 i_mtu;
 161
 162     block_t             *p_buffer;
 163
 164     sout_access_thread_t *p_thread;
 165
 166     vlc_bool_t          b_mtu_warning;
 167 };
 168
 169 #define DEFAULT_PORT 1234
 170 #define RTP_HEADER_LENGTH 12
 171
 172 /*****************************************************************************
 173  * Open: open the file
 174  *****************************************************************************/
 175 static int Open( vlc_object_t *p_this )
 176 {
 177     sout_access_out_t       *p_access = (sout_access_out_t*)p_this;
 178     sout_access_out_sys_t   *p_sys;
 179
 180     char                *psz_parser;
 181     char                *psz_dst_addr;
 182     int                 i_dst_port;
 183
 184     int                 i_handle;
 185
 186     vlc_value_t         val;
 187
 188     config_ChainParse( p_access, SOUT_CFG_PREFIX,
 189                        ppsz_sout_options, p_access->p_cfg );
 190     config_ChainParse( p_access, "",
 191                        ppsz_core_options, p_access->p_cfg );
 192
 193     if( !( p_sys = malloc( sizeof( sout_access_out_sys_t ) ) ) )
 194     {
 195         msg_Err( p_access, "not enough memory" );
 196         return VLC_EGENERIC;
 197     }
 198     memset( p_sys, 0, sizeof(sout_access_out_sys_t) );
 199     p_access->p_sys = p_sys;
 200
 201     if( p_access->psz_access != NULL &&
 202         !strcmp( p_access->psz_access, "rtp" ) )
 203     {
 204         p_sys->b_rtpts = 1;
 205     }
 206     else
 207     {
 208         p_sys->b_rtpts = 0;
 209     }
 210
 211     psz_parser = strdup( p_access->psz_name );
 212
 213     psz_dst_addr = psz_parser;
 214     i_dst_port = 0;
 215
 216     if ( *psz_parser == '[' )
 217     {
 218         while( *psz_parser && *psz_parser != ']' )
 219         {
 220             psz_parser++;
 221         }
 222     }
 223     while( *psz_parser && *psz_parser != ':' )
 224     {
 225         psz_parser++;
 226     }
 227     if( *psz_parser == ':' )
 228     {
 229         *psz_parser = '\0';
 230         psz_parser++;
 231         i_dst_port = atoi( psz_parser );
 232     }
 233     if( i_dst_port <= 0 )
 234     {
 235         i_dst_port = DEFAULT_PORT;
 236     }
 237
 238     p_sys->p_thread =
 239         vlc_object_create( p_access, sizeof( sout_access_thread_t ) );
 240     if( !p_sys->p_thread )
 241     {
 242         msg_Err( p_access, "out of memory" );
 243         return VLC_EGENERIC;
 244     }
 245
 246     vlc_object_attach( p_sys->p_thread, p_access );
 247     p_sys->p_thread->p_sout = p_access->p_sout;
 248     p_sys->p_thread->b_die  = 0;
 249     p_sys->p_thread->b_error= 0;
 250     p_sys->p_thread->p_fifo = block_FifoNew( p_access );
 251     p_sys->p_thread->p_empty_blocks = block_FifoNew( p_access );
 252
 253     i_handle = net_ConnectUDP( p_this, psz_dst_addr, i_dst_port, -1 );
 254     if( i_handle == -1 )
 255     {
 256          msg_Err( p_access, "failed to create UDP socket" );
 257          return VLC_EGENERIC;
 258     }
 259
 260     p_sys->p_thread->i_handle = i_handle;
 261     net_StopRecv( i_handle );
 262
 263     var_Get( p_access, SOUT_CFG_PREFIX "caching", &val );
 264     p_sys->p_thread->i_caching = (int64_t)val.i_int * 1000;
 265
 266     var_Get( p_access, SOUT_CFG_PREFIX "group", &val );
 267     p_sys->p_thread->i_group = val.i_int;
 268
 269     p_sys->i_mtu = var_CreateGetInteger( p_this, "mtu" );
 270
 271     if( vlc_thread_create( p_sys->p_thread, "sout write thread", ThreadWrite,
 272                            VLC_THREAD_PRIORITY_HIGHEST, VLC_FALSE ) )
 273     {
 274         msg_Err( p_access->p_sout, "cannot spawn sout access thread" );
 275         vlc_object_destroy( p_sys->p_thread );
 276         return VLC_EGENERIC;
 277     }
 278
 279     srand( (uint32_t)mdate());
 280     p_sys->p_buffer          = NULL;
 281     p_sys->i_sequence_number = rand()&0xffff;
 282     p_sys->i_ssrc            = rand()&0xffffffff;
 283
 284     var_Get( p_access, SOUT_CFG_PREFIX "raw", &val );
 285     if( val.b_bool )  p_access->pf_write = WriteRaw;
 286     else p_access->pf_write = Write;
 287
 288     p_access->pf_seek = Seek;
 289
 290     msg_Dbg( p_access, "udp access output opened(%s:%d)",
 291              psz_dst_addr, i_dst_port );
 292
 293     free( psz_dst_addr );
 294
 295     /* update p_sout->i_out_pace_nocontrol */
 296     p_access->p_sout->i_out_pace_nocontrol++;
 297
 298     return VLC_SUCCESS;
 299 }
 300
 301 /*****************************************************************************
 302  * Close: close the target
 303  *****************************************************************************/
 304 static void Close( vlc_object_t * p_this )
 305 {
 306     sout_access_out_t     *p_access = (sout_access_out_t*)p_this;
 307     sout_access_out_sys_t *p_sys = p_access->p_sys;
 308     int i;
 309
 310     p_sys->p_thread->b_die = 1;
 311     for( i = 0; i < 10; i++ )
 312     {
 313         block_t *p_dummy = block_New( p_access, p_sys->i_mtu );
 314         p_dummy->i_dts = 0;
 315         p_dummy->i_pts = 0;
 316         p_dummy->i_length = 0;
 317         memset( p_dummy->p_buffer, 0, p_dummy->i_buffer );
 318         block_FifoPut( p_sys->p_thread->p_fifo, p_dummy );
 319     }
 320     vlc_thread_join( p_sys->p_thread );
 321
 322     block_FifoRelease( p_sys->p_thread->p_fifo );
 323     block_FifoRelease( p_sys->p_thread->p_empty_blocks );
 324
 325     if( p_sys->p_buffer ) block_Release( p_sys->p_buffer );
 326
 327     net_Close( p_sys->p_thread->i_handle );
 328
 329     vlc_object_detach( p_sys->p_thread );
 330     vlc_object_destroy( p_sys->p_thread );
 331     /* update p_sout->i_out_pace_nocontrol */
 332     p_access->p_sout->i_out_pace_nocontrol--;
 333
 334     msg_Dbg( p_access, "udp access output closed" );
 335     free( p_sys );
 336 }
 337
 338 /*****************************************************************************
 339  * Write: standard write on a file descriptor.
 340  *****************************************************************************/
 341 static int Write( sout_access_out_t *p_access, block_t *p_buffer )
 342 {
 343     sout_access_out_sys_t *p_sys = p_access->p_sys;
 344
 345     while( p_buffer )
 346     {
 347         block_t *p_next;
 348         int i_packets = 0;
 349
 350         if( !p_sys->b_mtu_warning && p_buffer->i_buffer > p_sys->i_mtu )
 351         {
 352             msg_Warn( p_access, "packet size > MTU, you should probably "
 353                       "increase the MTU" );
 354             p_sys->b_mtu_warning = VLC_TRUE;
 355         }
 356
 357         /* Check if there is enough space in the buffer */
 358         if( p_sys->p_buffer &&
 359             p_sys->p_buffer->i_buffer + p_buffer->i_buffer > p_sys->i_mtu )
 360         {
 361             if( p_sys->p_buffer->i_dts + p_sys->p_thread->i_caching < mdate() )
 362             {
 363                 msg_Dbg( p_access, "late packet for udp input (" I64Fd ")",
 364                          mdate() - p_sys->p_buffer->i_dts
 365                           - p_sys->p_thread->i_caching );
 366             }
 367             block_FifoPut( p_sys->p_thread->p_fifo, p_sys->p_buffer );
 368             p_sys->p_buffer = NULL;
 369         }
 370
 371         while( p_buffer->i_buffer )
 372         {
 373             int i_payload_size = p_sys->i_mtu;
 374             if( p_sys->b_rtpts )
 375                 i_payload_size -= RTP_HEADER_LENGTH;
 376
 377             int i_write = __MIN( p_buffer->i_buffer, i_payload_size );
 378
 379             i_packets++;
 380
 381             if( !p_sys->p_buffer )
 382             {
 383                 p_sys->p_buffer = NewUDPPacket( p_access, p_buffer->i_dts );
 384                 if( !p_sys->p_buffer ) break;
 385             }
 386
 387             memcpy( p_sys->p_buffer->p_buffer + p_sys->p_buffer->i_buffer,
 388                     p_buffer->p_buffer, i_write );
 389
 390             p_sys->p_buffer->i_buffer += i_write;
 391             p_buffer->p_buffer += i_write;
 392             p_buffer->i_buffer -= i_write;
 393             if ( p_buffer->i_flags & BLOCK_FLAG_CLOCK )
 394             {
 395                 if ( p_sys->p_buffer->i_flags & BLOCK_FLAG_CLOCK )
 396                     msg_Warn( p_access, "putting two PCRs at once" );
 397                 p_sys->p_buffer->i_flags |= BLOCK_FLAG_CLOCK;
 398             }
 399
 400             if( p_sys->p_buffer->i_buffer == p_sys->i_mtu || i_packets > 1 )
 401             {
 402                 /* Flush */
 403                 if( p_sys->p_buffer->i_dts + p_sys->p_thread->i_caching
 404                       < mdate() )
 405                 {
 406                     msg_Dbg( p_access, "late packet for udp input (" I64Fd ")",
 407                              mdate() - p_sys->p_buffer->i_dts
 408                               - p_sys->p_thread->i_caching );
 409                 }
 410                 block_FifoPut( p_sys->p_thread->p_fifo, p_sys->p_buffer );
 411                 p_sys->p_buffer = NULL;
 412             }
 413         }
 414
 415         p_next = p_buffer->p_next;
 416         block_Release( p_buffer );
 417         p_buffer = p_next;
 418     }
 419
 420     return( p_sys->p_thread->b_error ? -1 : 0 );
 421 }
 422
 423 /*****************************************************************************
 424  * WriteRaw: write p_buffer without trying to fill mtu
 425  *****************************************************************************/
 426 static int WriteRaw( sout_access_out_t *p_access, block_t *p_buffer )
 427 {
 428     sout_access_out_sys_t   *p_sys = p_access->p_sys;
 429     block_t *p_buf;
 430
 431     while ( p_sys->p_thread->p_empty_blocks->i_depth >= MAX_EMPTY_BLOCKS )
 432     {
 433         p_buf = block_FifoGet(p_sys->p_thread->p_empty_blocks);
 434         block_Release( p_buf );
 435     }
 436
 437     block_FifoPut( p_sys->p_thread->p_fifo, p_buffer );
 438
 439     return( p_sys->p_thread->b_error ? -1 : 0 );
 440 }
 441
 442 /*****************************************************************************
 443  * Seek: seek to a specific location in a file
 444  *****************************************************************************/
 445 static int Seek( sout_access_out_t *p_access, off_t i_pos )
 446 {
 447     msg_Err( p_access, "UDP sout access cannot seek" );
 448     return -1;
 449 }
 450
 451 /*****************************************************************************
 452  * NewUDPPacket: allocate a new UDP packet of size p_sys->i_mtu
 453  *****************************************************************************/
 454 static block_t *NewUDPPacket( sout_access_out_t *p_access, mtime_t i_dts)
 455 {
 456     sout_access_out_sys_t *p_sys = p_access->p_sys;
 457     block_t *p_buffer;
 458
 459     while ( p_sys->p_thread->p_empty_blocks->i_depth > MAX_EMPTY_BLOCKS )
 460     {
 461         p_buffer = block_FifoGet( p_sys->p_thread->p_empty_blocks );
 462         block_Release( p_buffer );
 463     }
 464
 465     if( p_sys->p_thread->p_empty_blocks->i_depth == 0 )
 466     {
 467         p_buffer = block_New( p_access->p_sout, p_sys->i_mtu );
 468     }
 469     else
 470     {
 471         p_buffer = block_FifoGet(p_sys->p_thread->p_empty_blocks );
 472         p_buffer->i_flags = 0;
 473         p_buffer = block_Realloc( p_buffer, 0, p_sys->i_mtu );
 474     }
 475
 476     p_buffer->i_dts = i_dts;
 477     p_buffer->i_buffer = 0;
 478
 479     if( p_sys->b_rtpts )
 480     {
 481         mtime_t i_timestamp = p_buffer->i_dts * 9 / 100;
 482
 483         /* add rtp/ts header */
 484         p_buffer->p_buffer[0] = 0x80;
 485         p_buffer->p_buffer[1] = 0x21; // mpeg2-ts
 486
 487         p_buffer->p_buffer[2] = ( p_sys->i_sequence_number >> 8 )&0xff;
 488         p_buffer->p_buffer[3] = p_sys->i_sequence_number&0xff;
 489         p_sys->i_sequence_number++;
 490
 491         p_buffer->p_buffer[4] = ( i_timestamp >> 24 )&0xff;
 492         p_buffer->p_buffer[5] = ( i_timestamp >> 16 )&0xff;
 493         p_buffer->p_buffer[6] = ( i_timestamp >>  8 )&0xff;
 494         p_buffer->p_buffer[7] = i_timestamp&0xff;
 495
 496         p_buffer->p_buffer[ 8] = ( p_sys->i_ssrc >> 24 )&0xff;
 497         p_buffer->p_buffer[ 9] = ( p_sys->i_ssrc >> 16 )&0xff;
 498         p_buffer->p_buffer[10] = ( p_sys->i_ssrc >>  8 )&0xff;
 499         p_buffer->p_buffer[11] = p_sys->i_ssrc&0xff;
 500
 501         p_buffer->i_buffer = RTP_HEADER_LENGTH;
 502     }
 503
 504     return p_buffer;
 505 }
 506
 507 /*****************************************************************************
 508  * ThreadWrite: Write a packet on the network at the good time.
 509  *****************************************************************************/
 510 static void ThreadWrite( vlc_object_t *p_this )
 511 {
 512     sout_access_thread_t *p_thread = (sout_access_thread_t*)p_this;
 513     mtime_t              i_date_last = -1;
 514     mtime_t              i_to_send = p_thread->i_group;
 515     int                  i_dropped_packets = 0;
 516 #if defined(WIN32) || defined(UNDER_CE)
 517     char strerror_buf[WINSOCK_STRERROR_SIZE];
 518 # define strerror( x ) winsock_strerror( strerror_buf )
 519 #endif
 520
 521     while( !p_thread->b_die )
 522     {
 523         block_t *p_pk;
 524         mtime_t       i_date, i_sent;
 525 #if 0
 526         if( (i++ % 1000)==0 ) {
 527           int i = 0;
 528           int j = 0;
 529           block_t *p_tmp = p_thread->p_empty_blocks->p_first;
 530           while( p_tmp ) { p_tmp = p_tmp->p_next; i++;}
 531           p_tmp = p_thread->p_fifo->p_first;
 532           while( p_tmp ) { p_tmp = p_tmp->p_next; j++;}
 533           msg_Err( p_thread, "fifo depth: %d/%d, empty blocks: %d/%d",
 534                    p_thread->p_fifo->i_depth, j,p_thread->p_empty_blocks->i_depth,i );
 535         }
 536 #endif
 537         p_pk = block_FifoGet( p_thread->p_fifo );
 538
 539         i_date = p_thread->i_caching + p_pk->i_dts;
 540         if( i_date_last > 0 )
 541         {
 542             if( i_date - i_date_last > 2000000 )
 543             {
 544                 if( !i_dropped_packets )
 545                     msg_Dbg( p_thread, "mmh, hole ("I64Fd" > 2s) -> drop",
 546                              i_date - i_date_last );
 547
 548                 block_FifoPut( p_thread->p_empty_blocks, p_pk );
 549
 550                 i_date_last = i_date;
 551                 i_dropped_packets++;
 552                 continue;
 553             }
 554             else if( i_date - i_date_last < -1000 )
 555             {
 556                 if( !i_dropped_packets )
 557                     msg_Dbg( p_thread, "mmh, packets in the past ("I64Fd")",
 558                              i_date_last - i_date );
 559             }
 560         }
 561
 562         i_to_send--;
 563         if( !i_to_send || (p_pk->i_flags & BLOCK_FLAG_CLOCK) )
 564         {
 565             mwait( i_date );
 566             i_to_send = p_thread->i_group;
 567         }
 568         if( send( p_thread->i_handle, p_pk->p_buffer, p_pk->i_buffer, 0 )
 569               == -1 )
 570         {
 571             msg_Warn( p_thread, "send error: %s", strerror(errno) );
 572         }
 573
 574         if( i_dropped_packets )
 575         {
 576             msg_Dbg( p_thread, "dropped %i packets", i_dropped_packets );
 577             i_dropped_packets = 0;
 578         }
 579
 580 #if 1
 581         i_sent = mdate();
 582         if ( i_sent > i_date + 20000 )
 583         {
 584             msg_Dbg( p_thread, "packet has been sent too late (" I64Fd ")",
 585                      i_sent - i_date );
 586         }
 587 #endif
 588
 589         block_FifoPut( p_thread->p_empty_blocks, p_pk );
 590
 591         i_date_last = i_date;
 592     }
 593 }