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