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

   1 /*****************************************************************************
   2  * udp.c
   3  *****************************************************************************
   4  * Copyright (C) 2001-2007 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 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc/vlc.h>
  33
  34 #include <sys/types.h>
  35 #include <sys/stat.h>
  36 #include <errno.h>
  37 #include <fcntl.h>
  38 #include <assert.h>
  39
  40 #include <vlc_sout.h>
  41 #include <vlc_block.h>
  42
  43 #ifdef HAVE_UNISTD_H
  44 #   include <unistd.h>
  45 #endif
  46
  47 #ifdef WIN32
  48 #   include <winsock2.h>
  49 #   include <ws2tcpip.h>
  50 #else
  51 #   include <sys/socket.h>
  52 #endif
  53
  54 #include <vlc_network.h>
  55
  56 #define MAX_EMPTY_BLOCKS 200
  57
  58 /*****************************************************************************
  59  * Module descriptor
  60  *****************************************************************************/
  61 static int  Open ( vlc_object_t * );
  62 static void Close( vlc_object_t * );
  63
  64 #define SOUT_CFG_PREFIX "sout-udp-"
  65
  66 #define CACHING_TEXT N_("Caching value (ms)")
  67 #define CACHING_LONGTEXT N_( \
  68     "Default caching value for outbound UDP streams. This " \
  69     "value should be set in milliseconds." )
  70
  71 #define GROUP_TEXT N_("Group packets")
  72 #define GROUP_LONGTEXT N_("Packets can be sent one by one at the right time " \
  73                           "or by groups. You can choose the number " \
  74                           "of packets that will be sent at a time. It " \
  75                           "helps reducing the scheduling load on " \
  76                           "heavily-loaded systems." )
  77
  78 vlc_module_begin();
  79     set_description( _("UDP stream output") );
  80     set_shortname( "UDP" );
  81     set_category( CAT_SOUT );
  82     set_subcategory( SUBCAT_SOUT_ACO );
  83     add_integer( SOUT_CFG_PREFIX "caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT, CACHING_LONGTEXT, true );
  84     add_integer( SOUT_CFG_PREFIX "group", 1, NULL, GROUP_TEXT, GROUP_LONGTEXT,
  85                                  true );
  86     add_obsolete_integer( SOUT_CFG_PREFIX "late" );
  87     add_obsolete_bool( SOUT_CFG_PREFIX "raw" );
  88
  89     set_capability( "sout access", 100 );
  90     add_shortcut( "udp" );
  91     set_callbacks( Open, Close );
  92 vlc_module_end();
  93
  94 /*****************************************************************************
  95  * Exported prototypes
  96  *****************************************************************************/
  97
  98 static const char *const ppsz_sout_options[] = {
  99     "caching",
 100     "group",
 101     NULL
 102 };
 103
 104 /* Options handled by the libvlc network core */
 105 static const char *const ppsz_core_options[] = {
 106     "dscp",
 107     "ttl",
 108     "miface",
 109     "miface-addr",
 110     NULL
 111 };
 112
 113 static ssize_t Write   ( sout_access_out_t *, block_t * );
 114 static int  Seek    ( sout_access_out_t *, off_t  );
 115
 116 static void ThreadWrite( vlc_object_t * );
 117 static block_t *NewUDPPacket( sout_access_out_t *, mtime_t );
 118 static const char *MakeRandMulticast (int family, char *buf, size_t buflen);
 119
 120 typedef struct sout_access_thread_t
 121 {
 122     VLC_COMMON_MEMBERS
 123
 124     sout_instance_t *p_sout;
 125
 126     block_fifo_t *p_fifo;
 127
 128     int         i_handle;
 129
 130     int64_t     i_caching;
 131     int         i_group;
 132
 133     block_fifo_t *p_empty_blocks;
 134 } sout_access_thread_t;
 135
 136 struct sout_access_out_sys_t
 137 {
 138     int                 i_mtu;
 139     bool          b_mtu_warning;
 140
 141     block_t             *p_buffer;
 142
 143     sout_access_thread_t *p_thread;
 144
 145 };
 146
 147 #define DEFAULT_PORT 1234
 148
 149 /*****************************************************************************
 150  * Open: open the file
 151  *****************************************************************************/
 152 static int Open( vlc_object_t *p_this )
 153 {
 154     sout_access_out_t       *p_access = (sout_access_out_t*)p_this;
 155     sout_access_out_sys_t   *p_sys;
 156
 157     char                *psz_dst_addr = NULL;
 158     int                 i_dst_port;
 159
 160     int                 i_handle;
 161
 162     config_ChainParse( p_access, SOUT_CFG_PREFIX,
 163                        ppsz_sout_options, p_access->p_cfg );
 164     config_ChainParse( p_access, "",
 165                        ppsz_core_options, p_access->p_cfg );
 166
 167     if (var_Create (p_access, "dst-port", VLC_VAR_INTEGER)
 168      || var_Create (p_access, "src-port", VLC_VAR_INTEGER)
 169      || var_Create (p_access, "dst-addr", VLC_VAR_STRING)
 170      || var_Create (p_access, "src-addr", VLC_VAR_STRING))
 171     {
 172         return VLC_ENOMEM;
 173     }
 174
 175     if( !( p_sys = calloc ( 1, sizeof( sout_access_out_sys_t ) ) ) )
 176     {
 177         msg_Err( p_access, "not enough memory" );
 178         return VLC_ENOMEM;
 179     }
 180     p_access->p_sys = p_sys;
 181
 182     i_dst_port = DEFAULT_PORT;
 183     char *psz_parser = psz_dst_addr = strdup( p_access->psz_path );
 184
 185     if (psz_parser[0] == '[')
 186         psz_parser = strchr (psz_parser, ']');
 187
 188     psz_parser = strchr (psz_parser ?: psz_dst_addr, ':');
 189     if (psz_parser != NULL)
 190     {
 191         *psz_parser++ = '\0';
 192         i_dst_port = atoi (psz_parser);
 193     }
 194
 195     p_sys->p_thread =
 196         vlc_object_create( p_access, sizeof( sout_access_thread_t ) );
 197     if( !p_sys->p_thread )
 198     {
 199         msg_Err( p_access, "out of memory" );
 200         free (p_sys);
 201         free (psz_dst_addr);
 202         return VLC_ENOMEM;
 203     }
 204
 205     vlc_object_attach( p_sys->p_thread, p_access );
 206     p_sys->p_thread->p_sout = p_access->p_sout;
 207     p_sys->p_thread->b_die  = 0;
 208     p_sys->p_thread->b_error= 0;
 209     p_sys->p_thread->p_fifo = block_FifoNew();
 210     p_sys->p_thread->p_empty_blocks = block_FifoNew();
 211
 212     i_handle = net_ConnectDgram( p_this, psz_dst_addr, i_dst_port, -1,
 213                                  IPPROTO_UDP );
 214     free (psz_dst_addr);
 215
 216     if( i_handle == -1 )
 217     {
 218          msg_Err( p_access, "failed to create raw UDP socket" );
 219          vlc_object_release (p_sys->p_thread);
 220          free (p_sys);
 221          return VLC_EGENERIC;
 222     }
 223     else
 224     {
 225         char addr[NI_MAXNUMERICHOST];
 226         int port;
 227
 228         if (net_GetSockAddress (i_handle, addr, &port) == 0)
 229         {
 230             msg_Dbg (p_access, "source: %s port %d", addr, port);
 231             var_SetString (p_access, "src-addr", addr);
 232             var_SetInteger (p_access, "src-port", port);
 233         }
 234
 235         if (net_GetPeerAddress (i_handle, addr, &port) == 0)
 236         {
 237             msg_Dbg (p_access, "destination: %s port %d", addr, port);
 238             var_SetString (p_access, "dst-addr", addr);
 239             var_SetInteger (p_access, "dst-port", port);
 240         }
 241     }
 242     p_sys->p_thread->i_handle = i_handle;
 243     shutdown( i_handle, SHUT_RD );
 244
 245     p_sys->p_thread->i_caching =
 246         (int64_t)1000 * var_GetInteger( p_access, SOUT_CFG_PREFIX "caching");
 247     p_sys->p_thread->i_group =
 248         var_GetInteger( p_access, SOUT_CFG_PREFIX "group" );
 249
 250     p_sys->i_mtu = var_CreateGetInteger( p_this, "mtu" );
 251     p_sys->p_buffer = NULL;
 252
 253     if( vlc_thread_create( p_sys->p_thread, "sout write thread", ThreadWrite,
 254                            VLC_THREAD_PRIORITY_HIGHEST, false ) )
 255     {
 256         msg_Err( p_access->p_sout, "cannot spawn sout access thread" );
 257         net_Close (i_handle);
 258         vlc_object_release( p_sys->p_thread );
 259         free (p_sys);
 260         return VLC_EGENERIC;
 261     }
 262
 263     p_access->pf_write = Write;
 264     p_access->pf_seek = Seek;
 265
 266     /* update p_sout->i_out_pace_nocontrol */
 267     p_access->p_sout->i_out_pace_nocontrol++;
 268
 269     return VLC_SUCCESS;
 270 }
 271
 272 /*****************************************************************************
 273  * Close: close the target
 274  *****************************************************************************/
 275 static void Close( vlc_object_t * p_this )
 276 {
 277     sout_access_out_t     *p_access = (sout_access_out_t*)p_this;
 278     sout_access_out_sys_t *p_sys = p_access->p_sys;
 279     int i;
 280
 281     vlc_object_kill( p_sys->p_thread );
 282     block_FifoWake( p_sys->p_thread->p_fifo );
 283
 284     for( i = 0; i < 10; i++ )
 285     {
 286         block_t *p_dummy = block_New( p_access, p_sys->i_mtu );
 287         p_dummy->i_dts = 0;
 288         p_dummy->i_pts = 0;
 289         p_dummy->i_length = 0;
 290         memset( p_dummy->p_buffer, 0, p_dummy->i_buffer );
 291         block_FifoPut( p_sys->p_thread->p_fifo, p_dummy );
 292     }
 293     vlc_thread_join( p_sys->p_thread );
 294
 295     block_FifoRelease( p_sys->p_thread->p_fifo );
 296     block_FifoRelease( p_sys->p_thread->p_empty_blocks );
 297
 298     if( p_sys->p_buffer ) block_Release( p_sys->p_buffer );
 299
 300     net_Close( p_sys->p_thread->i_handle );
 301
 302     vlc_object_detach( p_sys->p_thread );
 303     vlc_object_release( p_sys->p_thread );
 304     /* update p_sout->i_out_pace_nocontrol */
 305     p_access->p_sout->i_out_pace_nocontrol--;
 306
 307     msg_Dbg( p_access, "UDP access output closed" );
 308     free( p_sys );
 309 }
 310
 311 /*****************************************************************************
 312  * Write: standard write on a file descriptor.
 313  *****************************************************************************/
 314 static ssize_t Write( sout_access_out_t *p_access, block_t *p_buffer )
 315 {
 316     sout_access_out_sys_t *p_sys = p_access->p_sys;
 317     int i_len = 0;
 318
 319     while( p_buffer )
 320     {
 321         block_t *p_next;
 322         int i_packets = 0;
 323         mtime_t now = mdate();
 324
 325         if( !p_sys->b_mtu_warning && p_buffer->i_buffer > p_sys->i_mtu )
 326         {
 327             msg_Warn( p_access, "packet size > MTU, you should probably "
 328                       "increase the MTU" );
 329             p_sys->b_mtu_warning = true;
 330         }
 331
 332         /* Check if there is enough space in the buffer */
 333         if( p_sys->p_buffer &&
 334             p_sys->p_buffer->i_buffer + p_buffer->i_buffer > p_sys->i_mtu )
 335         {
 336             if( p_sys->p_buffer->i_dts + p_sys->p_thread->i_caching < now )
 337             {
 338                 msg_Dbg( p_access, "late packet for UDP input (%"PRId64 ")",
 339                          now - p_sys->p_buffer->i_dts
 340                           - p_sys->p_thread->i_caching );
 341             }
 342             block_FifoPut( p_sys->p_thread->p_fifo, p_sys->p_buffer );
 343             p_sys->p_buffer = NULL;
 344         }
 345
 346         i_len += p_buffer->i_buffer;
 347         while( p_buffer->i_buffer )
 348         {
 349             int i_payload_size = p_sys->i_mtu;
 350
 351             int i_write = __MIN( p_buffer->i_buffer, i_payload_size );
 352
 353             i_packets++;
 354
 355             if( !p_sys->p_buffer )
 356             {
 357                 p_sys->p_buffer = NewUDPPacket( p_access, p_buffer->i_dts );
 358                 if( !p_sys->p_buffer ) break;
 359             }
 360
 361             memcpy( p_sys->p_buffer->p_buffer + p_sys->p_buffer->i_buffer,
 362                     p_buffer->p_buffer, i_write );
 363
 364             p_sys->p_buffer->i_buffer += i_write;
 365             p_buffer->p_buffer += i_write;
 366             p_buffer->i_buffer -= i_write;
 367             if ( p_buffer->i_flags & BLOCK_FLAG_CLOCK )
 368             {
 369                 if ( p_sys->p_buffer->i_flags & BLOCK_FLAG_CLOCK )
 370                     msg_Warn( p_access, "putting two PCRs at once" );
 371                 p_sys->p_buffer->i_flags |= BLOCK_FLAG_CLOCK;
 372             }
 373
 374             if( p_sys->p_buffer->i_buffer == p_sys->i_mtu || i_packets > 1 )
 375             {
 376                 /* Flush */
 377                 if( p_sys->p_buffer->i_dts + p_sys->p_thread->i_caching < now )
 378                 {
 379                     msg_Dbg( p_access, "late packet for udp input (%"PRId64 ")",
 380                              mdate() - p_sys->p_buffer->i_dts
 381                               - p_sys->p_thread->i_caching );
 382                 }
 383                 block_FifoPut( p_sys->p_thread->p_fifo, p_sys->p_buffer );
 384                 p_sys->p_buffer = NULL;
 385             }
 386         }
 387
 388         p_next = p_buffer->p_next;
 389         block_Release( p_buffer );
 390         p_buffer = p_next;
 391     }
 392
 393     return( p_sys->p_thread->b_error ? -1 : i_len );
 394 }
 395
 396 /*****************************************************************************
 397  * Seek: seek to a specific location in a file
 398  *****************************************************************************/
 399 static int Seek( sout_access_out_t *p_access, off_t i_pos )
 400 {
 401     msg_Err( p_access, "UDP sout access cannot seek" );
 402     return -1;
 403 }
 404
 405 /*****************************************************************************
 406  * NewUDPPacket: allocate a new UDP packet of size p_sys->i_mtu
 407  *****************************************************************************/
 408 static block_t *NewUDPPacket( sout_access_out_t *p_access, mtime_t i_dts)
 409 {
 410     sout_access_out_sys_t *p_sys = p_access->p_sys;
 411     block_t *p_buffer;
 412
 413     while ( block_FifoCount( p_sys->p_thread->p_empty_blocks ) > MAX_EMPTY_BLOCKS )
 414     {
 415         p_buffer = block_FifoGet( p_sys->p_thread->p_empty_blocks );
 416         block_Release( p_buffer );
 417     }
 418
 419     if( block_FifoCount( p_sys->p_thread->p_empty_blocks ) == 0 )
 420     {
 421         p_buffer = block_New( p_access->p_sout, p_sys->i_mtu );
 422     }
 423     else
 424     {
 425         p_buffer = block_FifoGet(p_sys->p_thread->p_empty_blocks );
 426         p_buffer->i_flags = 0;
 427         p_buffer = block_Realloc( p_buffer, 0, p_sys->i_mtu );
 428     }
 429
 430     p_buffer->i_dts = i_dts;
 431     p_buffer->i_buffer = 0;
 432
 433     return p_buffer;
 434 }
 435
 436 /*****************************************************************************
 437  * ThreadWrite: Write a packet on the network at the good time.
 438  *****************************************************************************/
 439 static void ThreadWrite( vlc_object_t *p_this )
 440 {
 441     sout_access_thread_t *p_thread = (sout_access_thread_t*)p_this;
 442     mtime_t              i_date_last = -1;
 443     mtime_t              i_to_send = p_thread->i_group;
 444     int                  i_dropped_packets = 0;
 445
 446     while( !p_thread->b_die )
 447     {
 448         block_t *p_pk;
 449         mtime_t       i_date, i_sent;
 450 #if 0
 451         if( (i++ % 1000)==0 ) {
 452           int i = 0;
 453           int j = 0;
 454           block_t *p_tmp = p_thread->p_empty_blocks->p_first;
 455           while( p_tmp ) { p_tmp = p_tmp->p_next; i++;}
 456           p_tmp = p_thread->p_fifo->p_first;
 457           while( p_tmp ) { p_tmp = p_tmp->p_next; j++;}
 458           msg_Dbg( p_thread, "fifo depth: %d/%d, empty blocks: %d/%d",
 459                    p_thread->p_fifo->i_depth, j,p_thread->p_empty_blocks->i_depth,i );
 460         }
 461 #endif
 462         p_pk = block_FifoGet( p_thread->p_fifo );
 463         if( p_pk == NULL )
 464             continue; /* forced wake-up */
 465
 466         i_date = p_thread->i_caching + p_pk->i_dts;
 467         if( i_date_last > 0 )
 468         {
 469             if( i_date - i_date_last > 2000000 )
 470             {
 471                 if( !i_dropped_packets )
 472                     msg_Dbg( p_thread, "mmh, hole (%"PRId64" > 2s) -> drop",
 473                              i_date - i_date_last );
 474
 475                 block_FifoPut( p_thread->p_empty_blocks, p_pk );
 476
 477                 i_date_last = i_date;
 478                 i_dropped_packets++;
 479                 continue;
 480             }
 481             else if( i_date - i_date_last < -1000 )
 482             {
 483                 if( !i_dropped_packets )
 484                     msg_Dbg( p_thread, "mmh, packets in the past (%"PRId64")",
 485                              i_date_last - i_date );
 486             }
 487         }
 488
 489         i_to_send--;
 490         if( !i_to_send || (p_pk->i_flags & BLOCK_FLAG_CLOCK) )
 491         {
 492             mwait( i_date );
 493             i_to_send = p_thread->i_group;
 494         }
 495         ssize_t val = send( p_thread->i_handle, p_pk->p_buffer,
 496                             p_pk->i_buffer, 0 );
 497         if (val == -1)
 498         {
 499             msg_Warn( p_thread, "send error: %m" );
 500         }
 501
 502         if( i_dropped_packets )
 503         {
 504             msg_Dbg( p_thread, "dropped %i packets", i_dropped_packets );
 505             i_dropped_packets = 0;
 506         }
 507
 508 #if 1
 509         i_sent = mdate();
 510         if ( i_sent > i_date + 20000 )
 511         {
 512             msg_Dbg( p_thread, "packet has been sent too late (%"PRId64 ")",
 513                      i_sent - i_date );
 514         }
 515 #endif
 516
 517         block_FifoPut( p_thread->p_empty_blocks, p_pk );
 518
 519         i_date_last = i_date;
 520     }
 521 }