git.sesse.net Git - vlc/blob - src/input/mpeg_system.c

   1 /*****************************************************************************
   2  * mpeg_system.c: TS, PS and PES management
   3  *****************************************************************************
   4  * Copyright (C) 1998-2001 VideoLAN
   5  * $Id: mpeg_system.c,v 1.98 2002/06/01 12:32:01 sam Exp $
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *          Michel Lespinasse <walken@via.ecp.fr>
   9  *          Benoît Steiner <benny@via.ecp.fr>
  10  *          Samuel Hocevar <sam@via.ecp.fr>
  11  *          Henri Fallon <henri@via.ecp.fr>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  26  *****************************************************************************/
  27
  28 /*****************************************************************************
  29  * Preamble
  30  *****************************************************************************/
  31 #include <stdlib.h>
  32 #include <string.h>                                    /* memcpy(), memset() */
  33 #include <sys/types.h>                                              /* off_t */
  34
  35 #include <vlc/vlc.h>
  36
  37 #include "stream_control.h"
  38 #include "input_ext-intf.h"
  39 #include "input_ext-dec.h"
  40 #include "input_ext-plugins.h"
  41
  42 /*
  43  * PES Packet management
  44  */
  45
  46 /*****************************************************************************
  47  * MoveChunk
  48  *****************************************************************************
  49  * Small utility function used to parse discontinuous headers safely. Copies
  50  * i_buf_len bytes of data to a buffer and returns the size copied.
  51  * It also solves some alignment problems on non-IA-32, non-PPC processors.
  52  * This is a variation on the theme of input_ext-dec.h:GetChunk().
  53  *****************************************************************************/
  54 static inline size_t MoveChunk( byte_t * p_dest, data_packet_t ** pp_data_src,
  55                                 byte_t ** pp_src, size_t i_buf_len )
  56 {
  57     ptrdiff_t           i_available;
  58
  59     if( (i_available = (*pp_data_src)->p_payload_end - *pp_src)
  60             >= i_buf_len )
  61     {
  62         if( p_dest != NULL )
  63             memcpy( p_dest, *pp_src, i_buf_len );
  64         *pp_src += i_buf_len;
  65         return( i_buf_len );
  66     }
  67     else
  68     {
  69         size_t          i_init_len = i_buf_len;
  70
  71         do
  72         {
  73             if( p_dest != NULL )
  74                 memcpy( p_dest, *pp_src, i_available );
  75             *pp_data_src = (*pp_data_src)->p_next;
  76             i_buf_len -= i_available;
  77             p_dest += i_available;
  78             if( *pp_data_src == NULL )
  79             {
  80                 *pp_src = NULL;
  81                 return( i_init_len - i_buf_len );
  82             }
  83             *pp_src = (*pp_data_src)->p_payload_start;
  84         }
  85         while( (i_available = (*pp_data_src)->p_payload_end - *pp_src)
  86                 <= i_buf_len );
  87
  88         if( i_buf_len )
  89         {
  90             if( p_dest != NULL )
  91                 memcpy( p_dest, *pp_src, i_buf_len );
  92             *pp_src += i_buf_len;
  93         }
  94         return( i_init_len );
  95     }
  96 }
  97
  98 /*****************************************************************************
  99  * input_ParsePES
 100  *****************************************************************************
 101  * Parse a finished PES packet and analyze its header.
 102  *****************************************************************************/
 103 #define PES_HEADER_SIZE     7
 104 void input_ParsePES( input_thread_t * p_input, es_descriptor_t * p_es )
 105 {
 106     data_packet_t * p_data;
 107     byte_t *        p_byte;
 108     byte_t          p_header[PES_HEADER_SIZE];
 109     int             i_done;
 110
 111 #define p_pes (p_es->p_pes)
 112
 113     /* Parse the header. The header has a variable length, but in order
 114      * to improve the algorithm, we will read the 14 bytes we may be
 115      * interested in */
 116     p_data = p_pes->p_first;
 117     p_byte = p_data->p_payload_start;
 118     i_done = 0;
 119
 120     if( MoveChunk( p_header, &p_data, &p_byte, PES_HEADER_SIZE )
 121             != PES_HEADER_SIZE )
 122     {
 123         msg_Warn( p_input, "PES packet too short to have a header" );
 124         input_DeletePES( p_input->p_method_data, p_pes );
 125         p_pes = NULL;
 126         return;
 127     }
 128
 129     /* Get the PES size if defined */
 130     p_es->i_pes_real_size = U16_AT(p_header + 4);
 131     if( p_es->i_pes_real_size )
 132     {
 133         p_es->i_pes_real_size += 6;
 134     }
 135
 136     /* First read the 6 header bytes common to all PES packets:
 137      * use them to test the PES validity */
 138     if( (p_header[0] || p_header[1] || (p_header[2] != 1)) )
 139     {
 140         /* packet_start_code_prefix != 0x000001 */
 141         msg_Err( p_input, "data loss, PES packet does not start with 000001" );
 142         input_DeletePES( p_input->p_method_data, p_pes );
 143         p_pes = NULL;
 144     }
 145     else
 146     {
 147         int i_pes_header_size, i_payload_size;
 148
 149         if ( p_es->i_pes_real_size &&
 150              (p_es->i_pes_real_size != p_pes->i_pes_size) )
 151         {
 152             /* PES_packet_length is set and != total received payload */
 153             /* Warn the decoder that the data may be corrupt. */
 154             msg_Warn( p_input, "packet corrupted, PES sizes do not match" );
 155         }
 156
 157         switch( p_es->i_stream_id )
 158         {
 159         case 0xBC:  /* Program stream map */
 160         case 0xBE:  /* Padding */
 161         case 0xBF:  /* Private stream 2 */
 162         case 0xB0:  /* ECM */
 163         case 0xB1:  /* EMM */
 164         case 0xFF:  /* Program stream directory */
 165         case 0xF2:  /* DSMCC stream */
 166         case 0xF8:  /* ITU-T H.222.1 type E stream */
 167             /* The payload begins immediately after the 6 bytes header, so
 168              * we have finished with the parsing */
 169             i_pes_header_size = 6;
 170             break;
 171
 172         default:
 173             if( (p_header[6] & 0xC0) == 0x80 )
 174             {
 175                 /* MPEG-2 : the PES header contains at least 3 more bytes. */
 176                 size_t      i_max_len;
 177                 vlc_bool_t  b_has_pts, b_has_dts;
 178                 byte_t      p_full_header[12];
 179
 180                 p_pes->b_data_alignment = p_header[6] & 0x04;
 181
 182                 i_max_len = MoveChunk( p_full_header, &p_data, &p_byte, 12 );
 183                 if( i_max_len < 2 )
 184                 {
 185                     msg_Warn( p_input,
 186                               "PES packet too short to have a MPEG-2 header" );
 187                     input_DeletePES( p_input->p_method_data,
 188                                             p_pes );
 189                     p_pes = NULL;
 190                     return;
 191                 }
 192
 193                 b_has_pts = p_full_header[0] & 0x80;
 194                 b_has_dts = p_full_header[0] & 0x40;
 195                 i_pes_header_size = p_full_header[1] + 9;
 196
 197                 /* Now parse the optional header extensions */
 198                 if( b_has_pts )
 199                 {
 200                     if( i_max_len < 7 )
 201                     {
 202                         msg_Warn( p_input,
 203                              "PES packet too short to have a MPEG-2 header" );
 204                         input_DeletePES( p_input->p_method_data,
 205                                                 p_pes );
 206                         p_pes = NULL;
 207                         return;
 208                     }
 209                     p_pes->i_pts = input_ClockGetTS( p_input, p_es->p_pgrm,
 210                     ( ((mtime_t)(p_full_header[2] & 0x0E) << 29) |
 211                       ((mtime_t)(p_full_header[3]) << 22) |
 212                       ((mtime_t)(p_full_header[4] & 0xFE) << 14) |
 213                       ((mtime_t)p_full_header[5] << 7) |
 214                       ((mtime_t)p_full_header[6] >> 1) ) );
 215
 216                     if( b_has_dts )
 217                     {
 218                         if( i_max_len < 12 )
 219                         {
 220                             msg_Warn( p_input,
 221                               "PES packet too short to have a MPEG-2 header" );
 222                             input_DeletePES( p_input->p_method_data,
 223                                                     p_pes );
 224                             p_pes = NULL;
 225                             return;
 226                         }
 227                         p_pes->i_dts = input_ClockGetTS( p_input, p_es->p_pgrm,
 228                         ( ((mtime_t)(p_full_header[7] & 0x0E) << 29) |
 229                           (((mtime_t)U16_AT(p_full_header + 8) << 14)
 230                                 - (1 << 14)) |
 231                           ((mtime_t)U16_AT(p_full_header + 10) >> 1) ) );
 232                     }
 233                 }
 234             }
 235             else
 236             {
 237                 /* Probably MPEG-1 */
 238                 vlc_bool_t      b_has_pts, b_has_dts;
 239
 240                 i_pes_header_size = 6;
 241                 p_data = p_pes->p_first;
 242                 p_byte = p_data->p_payload_start;
 243                 /* Cannot fail because the previous one succeeded. */
 244                 MoveChunk( NULL, &p_data, &p_byte, 6 );
 245
 246                 while( *p_byte == 0xFF && i_pes_header_size < 23 )
 247                 {
 248                     i_pes_header_size++;
 249                     if( MoveChunk( NULL, &p_data, &p_byte, 1 ) != 1 )
 250                     {
 251                         msg_Warn( p_input,
 252                             "PES packet too short to have a MPEG-1 header" );
 253                         input_DeletePES( p_input->p_method_data, p_pes );
 254                         p_pes = NULL;
 255                         return;
 256                     }
 257                 }
 258                 if( i_pes_header_size == 23 )
 259                 {
 260                     msg_Err( p_input, "too much MPEG-1 stuffing" );
 261                     input_DeletePES( p_input->p_method_data, p_pes );
 262                     p_pes = NULL;
 263                     return;
 264                 }
 265
 266                 if( (*p_byte & 0xC0) == 0x40 )
 267                 {
 268                     /* Don't ask why... --Meuuh */
 269                     /* Erm... why ? --Sam */
 270                     /* Well... According to the recommendation, it is for
 271                      * STD_buffer_scale and STD_buffer_size. --Meuuh */
 272                     i_pes_header_size += 2;
 273                     if( MoveChunk( NULL, &p_data, &p_byte, 2 ) != 2 )
 274                     {
 275                         msg_Warn( p_input,
 276                             "PES packet too short to have a MPEG-1 header" );
 277                         input_DeletePES( p_input->p_method_data, p_pes );
 278                         p_pes = NULL;
 279                         return;
 280                     }
 281                 }
 282
 283                 i_pes_header_size++;
 284
 285                 b_has_pts = *p_byte & 0x20;
 286                 b_has_dts = *p_byte & 0x10;
 287
 288                 if( b_has_pts )
 289                 {
 290                     byte_t      p_ts[5];
 291
 292                     i_pes_header_size += 4;
 293                     if( MoveChunk( p_ts, &p_data, &p_byte, 5 ) != 5 )
 294                     {
 295                         msg_Warn( p_input,
 296                             "PES packet too short to have a MPEG-1 header" );
 297                         input_DeletePES( p_input->p_method_data, p_pes );
 298                         p_pes = NULL;
 299                         return;
 300                     }
 301
 302                     p_pes->i_pts = input_ClockGetTS( p_input, p_es->p_pgrm,
 303                        ( ((mtime_t)(p_ts[0] & 0x0E) << 29) |
 304                          (((mtime_t)U32_AT(p_ts) & 0xFFFE00) << 6) |
 305                          ((mtime_t)p_ts[3] << 7) |
 306                          ((mtime_t)p_ts[4] >> 1) ) );
 307
 308                     if( b_has_dts )
 309                     {
 310                         i_pes_header_size += 5;
 311                         if( MoveChunk( p_ts, &p_data, &p_byte, 5 ) != 5 )
 312                         {
 313                             msg_Warn( p_input,
 314                               "PES packet too short to have a MPEG-1 header" );
 315                             input_DeletePES( p_input->p_method_data, p_pes );
 316                             p_pes = NULL;
 317                             return;
 318                         }
 319
 320                         p_pes->i_dts = input_ClockGetTS( p_input,
 321                                                          p_es->p_pgrm,
 322                             ( ((mtime_t)(p_ts[0] & 0x0E) << 29) |
 323                               (((mtime_t)U32_AT(p_ts) & 0xFFFE00) << 6) |
 324                               ((mtime_t)p_ts[3] << 7) |
 325                               ((mtime_t)p_ts[4] >> 1) ) );
 326                     }
 327                 }
 328             }
 329
 330             break;
 331         }
 332
 333         if( p_es->i_stream_id == 0xbd )
 334         {
 335             /* With private stream 1, the first byte of the payload
 336              * is a stream_private_id, so skip it. */
 337             i_pes_header_size++;
 338         }
 339
 340         if( p_es->i_type == AC3_AUDIO_ES )
 341         {
 342             /* With ac3 audio, we need to skip first 3 bytes */
 343             i_pes_header_size += 3;
 344         }
 345
 346         /* Now we've parsed the header, we just have to indicate in some
 347          * specific data packets where the PES payload begins (renumber
 348          * p_payload_start), so that the decoders can find the beginning
 349          * of their data right out of the box. */
 350         p_data = p_pes->p_first;
 351         i_payload_size = p_data->p_payload_end
 352                                  - p_data->p_payload_start;
 353         while( i_pes_header_size > i_payload_size )
 354         {
 355             /* These packets are entirely filled by the PES header. */
 356             i_pes_header_size -= i_payload_size;
 357             p_data->p_payload_start = p_data->p_payload_end;
 358             /* Go to the next data packet. */
 359             if( (p_data = p_data->p_next) == NULL )
 360             {
 361                 msg_Err( p_input, "PES header bigger than payload" );
 362                 input_DeletePES( p_input->p_method_data, p_pes );
 363                 p_pes = NULL;
 364                 return;
 365             }
 366             i_payload_size = p_data->p_payload_end
 367                                  - p_data->p_payload_start;
 368         }
 369         /* This last packet is partly header, partly payload. */
 370         if( i_payload_size < i_pes_header_size )
 371         {
 372             msg_Err( p_input, "PES header bigger than payload" );
 373             input_DeletePES( p_input->p_method_data, p_pes );
 374             p_pes = NULL;
 375             return;
 376         }
 377         p_data->p_payload_start += i_pes_header_size;
 378
 379
 380         /* Now we can eventually put the PES packet in the decoder's
 381          * PES fifo */
 382         if( p_es->p_decoder_fifo != NULL )
 383         {
 384             input_DecodePES( p_es->p_decoder_fifo, p_pes );
 385         }
 386         else
 387         {
 388             msg_Err( p_input, "no fifo to receive PES %p "
 389                               "(who wrote this damn code ?)", p_pes );
 390             input_DeletePES( p_input->p_method_data, p_pes );
 391         }
 392         p_pes = NULL;
 393     }
 394 #undef p_pes
 395
 396 }
 397
 398 /*****************************************************************************
 399  * input_GatherPES:
 400  *****************************************************************************
 401  * Gather a PES packet.
 402  *****************************************************************************/
 403 void input_GatherPES( input_thread_t * p_input, data_packet_t * p_data,
 404                       es_descriptor_t * p_es,
 405                       vlc_bool_t b_unit_start, vlc_bool_t b_packet_lost )
 406 {
 407 #define p_pes (p_es->p_pes)
 408
 409     /* If we lost data, insert a NULL data packet (philosophy : 0 is quite
 410      * often an escape sequence in decoders, so that should make them wait
 411      * for the next start code). */
 412     if( b_packet_lost )
 413     {
 414         input_NullPacket( p_input, p_es );
 415     }
 416
 417     if( b_unit_start && p_pes != NULL )
 418     {
 419         /* If the data packet contains the begining of a new PES packet, and
 420          * if we were reassembling a PES packet, then the PES should be
 421          * complete now, so parse its header and give it to the decoders. */
 422         input_ParsePES( p_input, p_es );
 423     }
 424
 425     if( !b_unit_start && p_pes == NULL )
 426     {
 427         /* Random access... */
 428         input_DeletePacket( p_input->p_method_data, p_data );
 429     }
 430     else
 431     {
 432         if( b_unit_start )
 433         {
 434             /* If we are at the beginning of a new PES packet, we must fetch
 435              * a new PES buffer to begin with the reassembly of this PES
 436              * packet. This is also here that we can synchronize with the
 437              * stream if we lost packets or if the decoder has just
 438              * started. */
 439             if( (p_pes = input_NewPES( p_input->p_method_data ) ) == NULL )
 440             {
 441                 msg_Err( p_input, "out of memory" );
 442                 p_input->b_error = 1;
 443                 return;
 444             }
 445             p_pes->i_rate = p_input->stream.control.i_rate;
 446             p_pes->p_first = p_data;
 447
 448             /* If the PES header fits in the first data packet, we can
 449              * already set p_gather->i_pes_real_size. */
 450             if( p_data->p_payload_end - p_data->p_payload_start
 451                     >= PES_HEADER_SIZE )
 452             {
 453                 p_es->i_pes_real_size = ((u16)p_data->p_payload_start[4] << 8)
 454                                          + p_data->p_payload_start[5] + 6;
 455             }
 456             else
 457             {
 458                 p_es->i_pes_real_size = 0;
 459             }
 460         }
 461         else
 462         {
 463             /* Update the relations between the data packets */
 464             p_pes->p_last->p_next = p_data;
 465         }
 466
 467         p_pes->p_last = p_data;
 468         p_pes->i_nb_data++;
 469
 470         /* Size of the payload carried in the data packet */
 471         p_pes->i_pes_size += (p_data->p_payload_end
 472                                  - p_data->p_payload_start);
 473
 474         /* We can check if the packet is finished */
 475         if( p_pes->i_pes_size == p_es->i_pes_real_size )
 476         {
 477             /* The packet is finished, parse it */
 478             input_ParsePES( p_input, p_es );
 479         }
 480     }
 481 #undef p_pes
 482 }
 483
 484
 485 /*
 486  * PS Demultiplexing
 487  */
 488
 489 /*****************************************************************************
 490  * GetID: Get the ID of a stream
 491  *****************************************************************************/
 492 static u16 GetID( data_packet_t * p_data )
 493 {
 494     u16         i_id;
 495
 496     i_id = p_data->p_demux_start[3];                            /* stream_id */
 497     if( i_id == 0xBD )
 498     {
 499         /* FIXME : this is not valid if the header is split in multiple
 500          * packets */
 501         /* stream_private_id */
 502         i_id |= p_data->p_demux_start[ 9 + p_data->p_demux_start[8] ] << 8;
 503     }
 504     return( i_id );
 505 }
 506
 507 /*****************************************************************************
 508  * DecodePSM: Decode the Program Stream Map information
 509  *****************************************************************************
 510  * FIXME : loads are not aligned in this function
 511  *****************************************************************************/
 512 static void DecodePSM( input_thread_t * p_input, data_packet_t * p_data )
 513 {
 514     stream_ps_data_t *  p_demux =
 515                  (stream_ps_data_t *)p_input->stream.p_demux_data;
 516     byte_t *            p_byte;
 517     byte_t *            p_end;
 518     int                 i;
 519     int                 i_new_es_number = 0;
 520
 521     if( p_data->p_demux_start + 10 > p_data->p_payload_end )
 522     {
 523         msg_Err( p_input, "PSM too short, packet corrupt" );
 524         return;
 525     }
 526
 527     if( p_demux->b_has_PSM
 528         && p_demux->i_PSM_version == (p_data->p_demux_start[6] & 0x1F) )
 529     {
 530         /* Already got that one. */
 531         return;
 532     }
 533
 534     p_demux->b_has_PSM = 1;
 535     p_demux->i_PSM_version = p_data->p_demux_start[6] & 0x1F;
 536
 537     /* Go to elementary_stream_map_length, jumping over
 538      * program_stream_info. */
 539     p_byte = p_data->p_demux_start + 10
 540               + U16_AT(&p_data->p_demux_start[8]);
 541     if( p_byte > p_data->p_payload_end )
 542     {
 543         msg_Err( p_input, "PSM too short, packet corrupt" );
 544         return;
 545     }
 546     /* This is the full size of the elementary_stream_map.
 547      * 2 == elementary_stream_map_length
 548      * Please note that CRC_32 is not included in the length. */
 549     p_end = p_byte + 2 + U16_AT(p_byte);
 550     p_byte += 2;
 551     if( p_end > p_data->p_payload_end )
 552     {
 553         msg_Err( p_input, "PSM too short, packet corrupt" );
 554         return;
 555     }
 556
 557     vlc_mutex_lock( &p_input->stream.stream_lock );
 558
 559     /* 4 == minimum useful size of a section */
 560     while( p_byte + 4 <= p_end )
 561     {
 562         es_descriptor_t *   p_es = NULL;
 563         u8                  i_stream_id = p_byte[1];
 564         /* FIXME: there will be a problem with private streams... (same
 565          * stream_id) */
 566
 567         /* Look for the ES in the ES table */
 568         for( i = i_new_es_number;
 569              i < p_input->stream.pp_programs[0]->i_es_number;
 570              i++ )
 571         {
 572             if( p_input->stream.pp_programs[0]->pp_es[i]->i_stream_id
 573                     == i_stream_id )
 574             {
 575                 p_es = p_input->stream.pp_programs[0]->pp_es[i];
 576                 if( p_es->i_type != p_byte[0] )
 577                 {
 578                     input_DelES( p_input, p_es );
 579                     p_es = NULL;
 580                 }
 581                 else
 582                 {
 583                     /* Move the ES to the beginning. */
 584                     p_input->stream.pp_programs[0]->pp_es[i]
 585                         = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
 586                     p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ]
 587                         = p_es;
 588                     i_new_es_number++;
 589                 }
 590                 break;
 591             }
 592         }
 593
 594         /* The goal is to have all the ES we have just read in the
 595          * beginning of the pp_es table, and all the others at the end,
 596          * so that we can close them more easily at the end. */
 597         if( p_es == NULL )
 598         {
 599             p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
 600                                 i_stream_id, 0 );
 601             p_es->i_type = p_byte[0];
 602             p_es->b_audio = ( p_es->i_type == MPEG1_AUDIO_ES
 603                               || p_es->i_type == MPEG2_AUDIO_ES
 604                               || p_es->i_type == AC3_AUDIO_ES
 605                               || p_es->i_type == LPCM_AUDIO_ES
 606                             );
 607
 608             /* input_AddES has inserted the new element at the end. */
 609             p_input->stream.pp_programs[0]->pp_es[
 610                 p_input->stream.pp_programs[0]->i_es_number ]
 611                 = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
 612             p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ] = p_es;
 613             i_new_es_number++;
 614         }
 615         p_byte += 4 + U16_AT(&p_byte[2]);
 616     }
 617
 618     /* Un-select the streams that are no longer parts of the program. */
 619     while( i_new_es_number < p_input->stream.pp_programs[0]->i_es_number )
 620     {
 621         /* We remove pp_es[i_new_es_member] and not pp_es[i] because the
 622          * list will be emptied starting from the end */
 623         input_DelES( p_input,
 624                      p_input->stream.pp_programs[0]->pp_es[i_new_es_number] );
 625     }
 626
 627     msg_Dbg( p_input, "the stream map after the PSM is now:" );
 628     input_DumpStream( p_input );
 629
 630     vlc_mutex_unlock( &p_input->stream.stream_lock );
 631 }
 632
 633 /*****************************************************************************
 634  * input_ReadPS: store a PS packet into a data_buffer_t
 635  *****************************************************************************/
 636 #define PEEK( SIZE )                                                        \
 637     i_error = input_Peek( p_input, &p_peek, SIZE );                         \
 638     if( i_error == -1 )                                                     \
 639     {                                                                       \
 640         return( -1 );                                                       \
 641     }                                                                       \
 642     else if( i_error < SIZE )                                               \
 643     {                                                                       \
 644         /* EOF */                                                           \
 645         return( 0 );                                                        \
 646     }
 647
 648 ssize_t input_ReadPS( input_thread_t * p_input, data_packet_t ** pp_data )
 649 {
 650     byte_t *            p_peek;
 651     size_t              i_packet_size;
 652     ssize_t             i_error, i_read;
 653
 654     /* Read what we believe to be a packet header. */
 655     PEEK( 4 );
 656
 657     if( p_peek[0] || p_peek[1] || p_peek[2] != 1 || p_peek[3] < 0xB9 )
 658     {
 659         if( p_peek[0] || p_peek[1] || p_peek[2] )
 660         {
 661             /* It is common for MPEG-1 streams to pad with zeros
 662              * (although it is forbidden by the recommendation), so
 663              * don't bother everybody in this case. */
 664             msg_Warn( p_input, "garbage (0x%.2x%.2x%.2x%.2x)",
 665                       p_peek[0], p_peek[1], p_peek[2], p_peek[3] );
 666         }
 667
 668         /* This is not the startcode of a packet. Read the stream
 669          * until we find one. */
 670         while( p_peek[0] || p_peek[1] || p_peek[2] != 1 || p_peek[3] < 0xB9 )
 671         {
 672             p_input->p_current_data++;
 673             PEEK( 4 );
 674             if( p_input->b_die ) return( -1 );
 675         }
 676         /* Packet found. */
 677     }
 678
 679     /* 0x1B9 == SYSTEM_END_CODE, it is only 4 bytes long. */
 680     if( p_peek[3] != 0xB9 )
 681     {
 682         /* The packet is at least 6 bytes long. */
 683         PEEK( 6 );
 684
 685         if( p_peek[3] != 0xBA )
 686         {
 687             /* That's the case for all packets, except pack header. */
 688             i_packet_size = (p_peek[4] << 8) | p_peek[5];
 689         }
 690         else
 691         {
 692             /* Pack header. */
 693             if( (p_peek[4] & 0xC0) == 0x40 )
 694             {
 695                 /* MPEG-2 */
 696                 i_packet_size = 8;
 697             }
 698             else if( (p_peek[4] & 0xF0) == 0x20 )
 699             {
 700                 /* MPEG-1 */
 701                 i_packet_size = 6;
 702             }
 703             else
 704             {
 705                 msg_Err( p_input, "unable to determine stream type" );
 706                 return( -1 );
 707             }
 708         }
 709     }
 710     else
 711     {
 712         /* System End Code */
 713         i_packet_size = -2;
 714     }
 715
 716     /* Fetch a packet of the appropriate size. */
 717     i_read = input_SplitBuffer( p_input, pp_data, i_packet_size + 6 );
 718     if( i_read <= 0 )
 719     {
 720         return( i_read );
 721     }
 722
 723     /* In MPEG-2 pack headers we still have to read stuffing bytes. */
 724     if( ((*pp_data)->p_demux_start[3] == 0xBA) && (i_packet_size == 8) )
 725     {
 726         size_t i_stuffing = ((*pp_data)->p_demux_start[13] & 0x7);
 727         /* Force refill of the input buffer - though we don't care
 728          * about p_peek. Please note that this is unoptimized. */
 729         PEEK( i_stuffing );
 730         p_input->p_current_data += i_stuffing;
 731     }
 732
 733     return( 1 );
 734 }
 735
 736 #undef PEEK
 737
 738 /*****************************************************************************
 739  * input_ParsePS: read the PS header
 740  *****************************************************************************/
 741 es_descriptor_t * input_ParsePS( input_thread_t * p_input,
 742                                  data_packet_t * p_data )
 743 {
 744     u32                 i_code;
 745     es_descriptor_t *   p_es = NULL;
 746
 747     i_code = p_data->p_demux_start[3];
 748
 749     if( i_code > 0xBC ) /* ES start code */
 750     {
 751         u16                 i_id;
 752         int                 i_dummy;
 753
 754         /* This is a PES packet. Find out if we want it or not. */
 755         i_id = GetID( p_data );
 756
 757         vlc_mutex_lock( &p_input->stream.stream_lock );
 758         if( p_input->stream.pp_programs[0]->b_is_ok )
 759         {
 760             /* Look only at the selected ES. */
 761             for( i_dummy = 0; i_dummy < p_input->stream.i_selected_es_number;
 762                  i_dummy++ )
 763             {
 764                 if( p_input->stream.pp_selected_es[i_dummy] != NULL
 765                     && p_input->stream.pp_selected_es[i_dummy]->i_id == i_id )
 766                 {
 767                     p_es = p_input->stream.pp_selected_es[i_dummy];
 768                     break;
 769                 }
 770             }
 771         }
 772         else
 773         {
 774             stream_ps_data_t * p_demux =
 775               (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
 776
 777             /* Search all ES ; if not found -> AddES */
 778             p_es = input_FindES( p_input, i_id );
 779
 780             if( p_es == NULL && !p_demux->b_has_PSM )
 781             {
 782                 p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
 783                                     i_id, 0 );
 784                 if( p_es != NULL )
 785                 {
 786                     p_es->i_stream_id = p_data->p_demux_start[3];
 787
 788                     /* Set stream type and auto-spawn. */
 789                     if( (i_id & 0xF0) == 0xE0 )
 790                     {
 791                         /* MPEG video */
 792                         p_es->i_type = MPEG2_VIDEO_ES;
 793                         p_es->i_cat = VIDEO_ES;
 794 #ifdef AUTO_SPAWN
 795                         if( !p_input->stream.b_seekable )
 796                             input_SelectES( p_input, p_es );
 797 #endif
 798                     }
 799                     else if( (i_id & 0xE0) == 0xC0 )
 800                     {
 801                         /* MPEG audio */
 802                         p_es->i_type = MPEG2_AUDIO_ES;
 803                         p_es->b_audio = 1;
 804                         p_es->i_cat = AUDIO_ES;
 805 #ifdef AUTO_SPAWN
 806                         if( !p_input->stream.b_seekable )
 807                         if( config_GetInt( p_input, "audio-channel" )
 808                                 == (p_es->i_id & 0x1F) ||
 809                             ( config_GetInt( p_input, "audio-channel" ) < 0
 810                               && !(p_es->i_id & 0x1F) ) )
 811                         switch( config_GetInt( p_input, "audio-type" ) )
 812                         {
 813                         case -1:
 814                         case REQUESTED_MPEG:
 815                             input_SelectES( p_input, p_es );
 816                         }
 817 #endif
 818                     }
 819                     else if( (i_id & 0xF0FF) == 0x80BD )
 820                     {
 821                         /* AC3 audio (0x80->0x8F) */
 822                         p_es->i_type = AC3_AUDIO_ES;
 823                         p_es->b_audio = 1;
 824                         p_es->i_cat = AUDIO_ES;
 825 #ifdef AUTO_SPAWN
 826                         if( !p_input->stream.b_seekable )
 827                         if( config_GetInt( p_input, "audio-channel" )
 828                                 == ((p_es->i_id & 0xF00) >> 8) ||
 829                             ( config_GetInt( p_input, "audio-channel" ) < 0
 830                               && !((p_es->i_id & 0xF00) >> 8)) )
 831                         switch( config_GetInt( p_input, "audio-type" ) )
 832                         {
 833                         case -1:
 834                         case REQUESTED_AC3:
 835                             input_SelectES( p_input, p_es );
 836                         }
 837 #endif
 838                     }
 839                     else if( (i_id & 0xE0FF) == 0x20BD )
 840                     {
 841                         /* Subtitles video (0x20->0x3F) */
 842                         p_es->i_type = DVD_SPU_ES;
 843                         p_es->i_cat = SPU_ES;
 844 #ifdef AUTO_SPAWN
 845                         if( config_GetInt( p_input, "spu-channel" )
 846                                 == ((p_es->i_id & 0x1F00) >> 8) )
 847                         {
 848                             if( !p_input->stream.b_seekable )
 849                                 input_SelectES( p_input, p_es );
 850                         }
 851 #endif
 852                     }
 853                     else if( (i_id & 0xF0FF) == 0xA0BD )
 854                     {
 855                         /* LPCM audio (0xA0->0xAF) */
 856                         p_es->i_type = LPCM_AUDIO_ES;
 857                         p_es->b_audio = 1;
 858                         p_es->i_cat = AUDIO_ES;
 859                     }
 860                     else
 861                     {
 862                         p_es->i_type = UNKNOWN_ES;
 863                     }
 864                 }
 865
 866                 /* Tell the interface the stream has changed */
 867                 p_input->stream.b_changed = 1;
 868             }
 869         } /* stream.b_is_ok */
 870         vlc_mutex_unlock( &p_input->stream.stream_lock );
 871     } /* i_code > 0xBC */
 872
 873     return( p_es );
 874 }
 875
 876 /*****************************************************************************
 877  * input_DemuxPS: first step of demultiplexing: the PS header
 878  *****************************************************************************/
 879 void input_DemuxPS( input_thread_t * p_input, data_packet_t * p_data )
 880 {
 881     u32                 i_code;
 882     vlc_bool_t          b_trash = 0;
 883     es_descriptor_t *   p_es = NULL;
 884
 885     i_code = ((u32)p_data->p_demux_start[0] << 24)
 886                 | ((u32)p_data->p_demux_start[1] << 16)
 887                 | ((u32)p_data->p_demux_start[2] << 8)
 888                 | p_data->p_demux_start[3];
 889     if( i_code <= 0x1BC )
 890     {
 891         switch( i_code )
 892         {
 893         case 0x1BA: /* PACK_START_CODE */
 894             {
 895                 /* Read the SCR. */
 896                 mtime_t         scr_time;
 897                 u32             i_mux_rate;
 898
 899                 if( (p_data->p_demux_start[4] & 0xC0) == 0x40 )
 900                 {
 901                     /* MPEG-2 */
 902                     byte_t      p_header[14];
 903                     byte_t *    p_byte;
 904                     p_byte = p_data->p_demux_start;
 905
 906                     if( MoveChunk( p_header, &p_data, &p_byte, 14 ) != 14 )
 907                     {
 908                         msg_Warn( p_input,
 909                                   "packet too short to have a header" );
 910                         b_trash = 1;
 911                         break;
 912                     }
 913                     scr_time =
 914                          ((mtime_t)(p_header[4] & 0x38) << 27) |
 915                          ((mtime_t)(U32_AT(p_header + 4) & 0x03FFF800)
 916                                         << 4) |
 917                          ((( ((mtime_t)U16_AT(p_header + 6) << 16)
 918                             | (mtime_t)U16_AT(p_header + 8) ) & 0x03FFF800)
 919                                         >> 11);
 920
 921                     /* mux_rate */
 922                     i_mux_rate = ((u32)U16_AT(p_header + 10) << 6)
 923                                    | (p_header[12] >> 2);
 924                     /* FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
 925                      * This is the biggest kludge ever !
 926                      * I don't know what's wrong with mux_rate calculation
 927                      * but this heuristic works well : */
 928                     i_mux_rate <<= 1;
 929                     i_mux_rate /= 3;
 930                 }
 931                 else
 932                 {
 933                     /* MPEG-1 SCR is like PTS. */
 934                     byte_t      p_header[12];
 935                     byte_t *    p_byte;
 936                     p_byte = p_data->p_demux_start;
 937
 938                     if( MoveChunk( p_header, &p_data, &p_byte, 12 ) != 12 )
 939                     {
 940                         msg_Warn( p_input,
 941                                   "packet too short to have a header" );
 942                         b_trash = 1;
 943                         break;
 944                     }
 945                     scr_time =
 946                          ((mtime_t)(p_header[4] & 0x0E) << 29) |
 947                          (((mtime_t)U32_AT(p_header + 4) & 0xFFFE00) << 6) |
 948                          ((mtime_t)p_header[7] << 7) |
 949                          ((mtime_t)p_header[8] >> 1);
 950
 951                     /* mux_rate */
 952                     i_mux_rate = (U32_AT(p_header + 8) & 0x7FFFFE) >> 1;
 953                 }
 954                 /* Call the pace control. */
 955                 input_ClockManageRef( p_input,
 956                                       p_input->stream.p_selected_program,
 957                                       scr_time );
 958
 959                 if( i_mux_rate != p_input->stream.i_mux_rate
 960                      && p_input->stream.i_mux_rate )
 961                 {
 962                     msg_Warn( p_input,
 963                               "mux_rate changed, expect cosmetic errors" );
 964                 }
 965                 p_input->stream.i_mux_rate = i_mux_rate;
 966
 967                 b_trash = 1;
 968             }
 969             break;
 970
 971         case 0x1BB: /* SYSTEM_START_CODE */
 972             b_trash = 1;                              /* Nothing interesting */
 973             break;
 974
 975         case 0x1BC: /* PROGRAM_STREAM_MAP_CODE */
 976             DecodePSM( p_input, p_data );
 977             b_trash = 1;
 978             break;
 979
 980         case 0x1B9: /* PROGRAM_END_CODE */
 981             b_trash = 1;
 982             break;
 983
 984         default:
 985             /* This should not happen */
 986             b_trash = 1;
 987             msg_Warn( p_input, "unwanted packet received "
 988                                "with startcode 0x%.8x", i_code );
 989         }
 990     }
 991     else
 992     {
 993         p_es = input_ParsePS( p_input, p_data );
 994
 995         vlc_mutex_lock( &p_input->stream.control.control_lock );
 996         if( p_es != NULL && p_es->p_decoder_fifo != NULL
 997              && (!p_es->b_audio || !p_input->stream.control.b_mute) )
 998         {
 999             vlc_mutex_unlock( &p_input->stream.control.control_lock );
1000             p_es->c_packets++;
1001             input_GatherPES( p_input, p_data, p_es, 1, 0 );
1002         }
1003         else
1004         {
1005             vlc_mutex_unlock( &p_input->stream.control.control_lock );
1006             b_trash = 1;
1007         }
1008     }
1009
1010     /* Trash the packet if it has no payload or if it isn't selected */
1011     if( b_trash )
1012     {
1013         input_DeletePacket( p_input->p_method_data, p_data );
1014         p_input->stream.c_packets_trashed++;
1015     }
1016 }
1017
1018
1019 /*
1020  * TS Demultiplexing
1021  */
1022
1023 /*****************************************************************************
1024  * input_ReadTS: store a TS packet into a data_buffer_t
1025  *****************************************************************************/
1026 #define PEEK( SIZE )                                                        \
1027     i_error = input_Peek( p_input, &p_peek, SIZE );                         \
1028     if( i_error == -1 )                                                     \
1029     {                                                                       \
1030         return( -1 );                                                       \
1031     }                                                                       \
1032     else if( i_error < SIZE )                                               \
1033     {                                                                       \
1034         /* EOF */                                                           \
1035         return( 0 );                                                        \
1036     }
1037
1038 ssize_t input_ReadTS( input_thread_t * p_input, data_packet_t ** pp_data )
1039 {
1040     byte_t *            p_peek;
1041     ssize_t             i_error, i_read;
1042
1043     PEEK( 1 );
1044
1045     if( *p_peek != TS_SYNC_CODE )
1046     {
1047         msg_Warn( p_input, "garbage at input (%x)", *p_peek );
1048
1049         if( p_input->i_mtu )
1050         {
1051             while( *p_peek != TS_SYNC_CODE )
1052             {
1053                 /* Try to resync on next packet. */
1054                 PEEK( TS_PACKET_SIZE );
1055                 p_input->p_current_data += TS_PACKET_SIZE;
1056                 PEEK( 1 );
1057             }
1058         }
1059         else
1060         {
1061             /* Move forward until we find 0x47 (and hope it's the good
1062              * one... FIXME) */
1063             while( *p_peek != TS_SYNC_CODE )
1064             {
1065                 p_input->p_current_data++;
1066                 PEEK( 1 );
1067             }
1068         }
1069     }
1070
1071     i_read = input_SplitBuffer( p_input, pp_data, TS_PACKET_SIZE );
1072     if( i_read <= 0 )
1073     {
1074         return( i_read );
1075     }
1076
1077     return( 1 );
1078 }
1079
1080 /*****************************************************************************
1081  * input_DemuxTS: first step of demultiplexing: the TS header
1082  *****************************************************************************/
1083 void input_DemuxTS( input_thread_t * p_input, data_packet_t * p_data,
1084                         psi_callback_t pf_psi_callback )
1085 {
1086     u16                 i_pid;
1087     int                 i_dummy;
1088     vlc_bool_t          b_adaptation;         /* Adaptation field is present */
1089     vlc_bool_t          b_payload;                 /* Packet carries payload */
1090     vlc_bool_t          b_unit_start;  /* A PSI or a PES start in the packet */
1091     vlc_bool_t          b_trash = 0;             /* Is the packet unuseful ? */
1092     vlc_bool_t          b_lost = 0;             /* Was there a packet loss ? */
1093     vlc_bool_t          b_psi = 0;                        /* Is this a PSI ? */
1094     vlc_bool_t          b_pcr = 0;                   /* Does it have a PCR ? */
1095     es_descriptor_t *   p_es = NULL;
1096     es_ts_data_t *      p_es_demux = NULL;
1097     pgrm_ts_data_t *    p_pgrm_demux = NULL;
1098
1099 #define p (p_data->p_demux_start)
1100     /* Extract flags values from TS common header. */
1101     i_pid = ((p[1] & 0x1F) << 8) | p[2];
1102     b_unit_start = (p[1] & 0x40);
1103     b_adaptation = (p[3] & 0x20);
1104     b_payload = (p[3] & 0x10);
1105
1106     /* Find out the elementary stream. */
1107     vlc_mutex_lock( &p_input->stream.stream_lock );
1108
1109     for( i_dummy = 0; i_dummy < p_input->stream.i_pgrm_number; i_dummy ++ )
1110     {
1111         if( (( pgrm_ts_data_t * ) p_input->stream.pp_programs[i_dummy]->
1112                     p_demux_data)->i_pcr_pid == i_pid )
1113         {
1114             b_pcr = 1;
1115             break;
1116         }
1117     }
1118
1119     p_es= input_FindES( p_input, i_pid );
1120
1121     if( (p_es != NULL) && (p_es->p_demux_data != NULL) )
1122     {
1123         p_es_demux = (es_ts_data_t *)p_es->p_demux_data;
1124
1125         if( p_es_demux->b_psi )
1126         {
1127             b_psi = 1;
1128         }
1129         else
1130         {
1131             p_pgrm_demux = (pgrm_ts_data_t *)p_es->p_pgrm->p_demux_data;
1132         }
1133     }
1134
1135     vlc_mutex_lock( &p_input->stream.control.control_lock );
1136     if( ( p_es == NULL ) || (p_es->b_audio && p_input->stream.control.b_mute) )
1137     {
1138         /* Not selected. Just read the adaptation field for a PCR. */
1139         b_trash = 1;
1140     }
1141     else if( p_es->p_decoder_fifo == NULL && !b_psi )
1142     {
1143         b_trash = 1;
1144     }
1145
1146     vlc_mutex_unlock( &p_input->stream.control.control_lock );
1147     vlc_mutex_unlock( &p_input->stream.stream_lock );
1148
1149
1150     /* Don't change the order of the tests : if b_psi then p_pgrm_demux
1151      * may still be null. Who said it was ugly ?
1152      * I have written worse. --Meuuh */
1153     if( ( p_es  ) &&
1154         ((p_es->p_decoder_fifo != NULL) || b_psi || b_pcr ) )
1155     {
1156         p_es->c_packets++;
1157
1158         /* Extract adaptation field information if any */
1159
1160         if( !b_adaptation )
1161         {
1162             /* We don't have any adaptation_field, so payload starts
1163              * immediately after the 4 byte TS header */
1164             p_data->p_payload_start += 4;
1165         }
1166         else
1167         {
1168             /* p[4] is adaptation_field_length minus one */
1169             p_data->p_payload_start += 5 + p[4];
1170
1171             /* The adaptation field can be limited to the
1172              * adaptation_field_length byte, so that there is nothing to do:
1173              * skip this possibility */
1174             if( p[4] )
1175             {
1176                 /* If the packet has both adaptation_field and payload,
1177                  * adaptation_field cannot be more than 182 bytes long; if
1178                  * there is only an adaptation_field, it must fill the next
1179                  * 183 bytes. */
1180                 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
1181                 {
1182                     msg_Warn( p_input, "invalid TS adaptation field (%p)",
1183                               p_data );
1184                     p_data->b_discard_payload = 1;
1185                     p_es->c_invalid_packets++;
1186                 }
1187
1188                 /* Now we are sure that the byte containing flags is present:
1189                  * read it */
1190                 else
1191                 {
1192                     /* discontinuity_indicator */
1193                     if( p[5] & 0x80 )
1194                     {
1195                         msg_Warn( p_input,
1196                             "discontinuity_indicator encountered by TS demux "
1197                             "(position read: %d, saved: %d)",
1198                             p[5] & 0x80, p_es_demux->i_continuity_counter );
1199
1200                         /* If the PID carries the PCR, there will be a system
1201                          * time-based discontinuity. We let the PCR decoder
1202                          * handle that. */
1203                         p_es->p_pgrm->i_synchro_state = SYNCHRO_REINIT;
1204
1205                         /* There also may be a continuity_counter
1206                          * discontinuity: resynchronize our counter with
1207                          * the one of the stream. */
1208                         p_es_demux->i_continuity_counter = (p[3] & 0x0f) - 1;
1209                     }
1210
1211                 } /* valid TS adaptation field ? */
1212             } /* length > 0 */
1213         } /* has adaptation field */
1214         /* Check the continuity of the stream. */
1215         i_dummy = ((p[3] & 0x0f) - p_es_demux->i_continuity_counter) & 0x0f;
1216         if( i_dummy == 1 )
1217         {
1218             /* Everything is ok, just increase our counter */
1219             (p_es_demux->i_continuity_counter)++;
1220         }
1221         else
1222         {
1223             if( !b_payload && i_dummy == 0 )
1224             {
1225                 /* This is a packet without payload, this is allowed by the
1226                  * draft. As there is nothing interesting in this packet
1227                  * (except PCR that have already been handled), we can trash
1228                  * the packet. */
1229                 msg_Warn( p_input,
1230                           "packet without payload received by TS demux" );
1231                 b_trash = 1;
1232             }
1233             else if( i_dummy <= 0 )
1234             {
1235                 /* Duplicate packet: mark it as being to be trashed. */
1236                 msg_Warn( p_input,
1237                           "duplicate packet received by TS demux" );
1238                 b_trash = 1;
1239             }
1240             else if( p_es_demux->i_continuity_counter == 0xFF )
1241             {
1242                 /* This means that the packet is the first one we receive for
1243                  * this ES since the continuity counter ranges between 0 and
1244                  * 0x0F excepts when it has been initialized by the input:
1245                  * init the counter to the correct value. */
1246                 msg_Warn( p_input, "first packet for PID %d received "
1247                                    "by TS demux", p_es->i_id );
1248                 p_es_demux->i_continuity_counter = (p[3] & 0x0f);
1249             }
1250             else
1251             {
1252                 /* This can indicate that we missed a packet or that the
1253                  * continuity_counter wrapped and we received a dup packet:
1254                  * as we don't know, do as if we missed a packet to be sure
1255                  * to recover from this situation */
1256                 msg_Warn( p_input,
1257                           "packet lost by TS demux: current %d, packet %d",
1258                           p_es_demux->i_continuity_counter & 0x0f,
1259                           p[3] & 0x0f );
1260                 b_lost = 1;
1261                 p_es_demux->i_continuity_counter = p[3] & 0x0f;
1262             } /* not continuous */
1263         } /* continuity */
1264     } /* if selected or PCR */
1265
1266     /* Handle PCR */
1267     if( b_pcr && b_adaptation && (p[5] & 0x10) && p[4]>=7 )
1268     {
1269         /* Read the PCR. */
1270         mtime_t     pcr_time;
1271         pcr_time = ( (mtime_t)p[6] << 25 ) |
1272                    ( (mtime_t)p[7] << 17 ) |
1273                    ( (mtime_t)p[8] << 9 ) |
1274                    ( (mtime_t)p[9] << 1 ) |
1275                    ( (mtime_t)p[10] >> 7 );
1276         /* Call the pace control. */
1277         for( i_dummy = 0; i_dummy < p_input->stream.i_pgrm_number;
1278                                 i_dummy ++ )
1279         {
1280             if( ( ( pgrm_ts_data_t * ) p_input->stream.pp_programs[i_dummy]->
1281                         p_demux_data )->i_pcr_pid == i_pid )
1282             {
1283                 input_ClockManageRef( p_input,
1284                     p_input->stream.pp_programs[i_dummy], pcr_time );
1285             }
1286         }
1287
1288     }
1289
1290     /* Trash the packet if it has no payload or if it isn't selected */
1291     if( b_trash )
1292     {
1293         input_DeletePacket( p_input->p_method_data, p_data );
1294         p_input->stream.c_packets_trashed++;
1295     }
1296     else
1297     {
1298         if( b_psi )
1299         {
1300             /* The payload contains PSI tables */
1301             (* pf_psi_callback) ( p_input, p_data, p_es, b_unit_start );
1302         }
1303         else
1304         {
1305             /* The payload carries a PES stream */
1306             input_GatherPES( p_input, p_data, p_es, b_unit_start, b_lost );
1307         }
1308
1309     }
1310
1311 #undef p
1312
1313 }