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 1.97.2.4 2002/10/01 21:55:53 massiot 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 <videolan/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         intf_WarnMsg( 1, "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         intf_ErrMsg( "input error: data loss, "
 142                      "PES packet doesn't start with 0x000001" );
 143         input_DeletePES( p_input->p_method_data, p_pes );
 144         p_pes = NULL;
 145     }
 146     else
 147     {
 148         int i_pes_header_size, i_payload_size;
 149
 150         if ( p_es->i_pes_real_size &&
 151              (p_es->i_pes_real_size != p_pes->i_pes_size) )
 152         {
 153             /* PES_packet_length is set and != total received payload */
 154             /* Warn the decoder that the data may be corrupt. */
 155             intf_WarnMsg( 1, "input: packet corrupted, "
 156                              "PES sizes do not match" );
 157         }
 158
 159         switch( p_es->i_stream_id )
 160         {
 161         case 0xBC:  /* Program stream map */
 162         case 0xBE:  /* Padding */
 163         case 0xBF:  /* Private stream 2 */
 164         case 0xB0:  /* ECM */
 165         case 0xB1:  /* EMM */
 166         case 0xFF:  /* Program stream directory */
 167         case 0xF2:  /* DSMCC stream */
 168         case 0xF8:  /* ITU-T H.222.1 type E stream */
 169             /* The payload begins immediately after the 6 bytes header, so
 170              * we have finished with the parsing */
 171             i_pes_header_size = 6;
 172             break;
 173
 174         default:
 175             if( (p_header[6] & 0xC0) == 0x80 )
 176             {
 177                 /* MPEG-2 : the PES header contains at least 3 more bytes. */
 178                 size_t      i_max_len;
 179                 boolean_t   b_has_pts, b_has_dts;
 180                 byte_t      p_full_header[12];
 181
 182                 p_pes->b_data_alignment = p_header[6] & 0x04;
 183
 184                 i_max_len = MoveChunk( p_full_header, &p_data, &p_byte, 12 );
 185                 if( i_max_len < 2 )
 186                 {
 187                     intf_WarnMsg( 1,
 188                             "PES packet too short to have a MPEG-2 header" );
 189                     input_DeletePES( p_input->p_method_data,
 190                                             p_pes );
 191                     p_pes = NULL;
 192                     return;
 193                 }
 194
 195                 b_has_pts = p_full_header[0] & 0x80;
 196                 b_has_dts = p_full_header[0] & 0x40;
 197                 i_pes_header_size = p_full_header[1] + 9;
 198
 199                 /* Now parse the optional header extensions */
 200                 if( b_has_pts )
 201                 {
 202                     if( i_max_len < 7 )
 203                     {
 204                         intf_WarnMsg( 1,
 205                             "PES packet too short to have a MPEG-2 header" );
 206                         input_DeletePES( p_input->p_method_data,
 207                                                 p_pes );
 208                         p_pes = NULL;
 209                         return;
 210                     }
 211                     p_pes->i_pts = input_ClockGetTS( p_input, p_es->p_pgrm,
 212                     ( ((mtime_t)(p_full_header[2] & 0x0E) << 29) |
 213                       ((mtime_t)(p_full_header[3]) << 22) |
 214                       ((mtime_t)(p_full_header[4] & 0xFE) << 14) |
 215                       ((mtime_t)p_full_header[5] << 7) |
 216                       ((mtime_t)p_full_header[6] >> 1) ) );
 217
 218                     if( b_has_dts )
 219                     {
 220                         if( i_max_len < 12 )
 221                         {
 222                             intf_WarnMsg( 1,
 223                               "PES packet too short to have a MPEG-2 header" );
 224                             input_DeletePES( p_input->p_method_data,
 225                                                     p_pes );
 226                             p_pes = NULL;
 227                             return;
 228                         }
 229                         p_pes->i_dts = input_ClockGetTS( p_input, p_es->p_pgrm,
 230                         ( ((mtime_t)(p_full_header[7] & 0x0E) << 29) |
 231                           (((mtime_t)U16_AT(p_full_header + 8) << 14)
 232                                 - (1 << 14)) |
 233                           ((mtime_t)U16_AT(p_full_header + 10) >> 1) ) );
 234                     }
 235                 }
 236             }
 237             else
 238             {
 239                 /* Probably MPEG-1 */
 240                 boolean_t       b_has_pts, b_has_dts;
 241
 242                 i_pes_header_size = 6;
 243                 p_data = p_pes->p_first;
 244                 p_byte = p_data->p_payload_start;
 245                 /* Cannot fail because the previous one succeeded. */
 246                 MoveChunk( NULL, &p_data, &p_byte, 6 );
 247
 248                 while( *p_byte == 0xFF && i_pes_header_size < 23 )
 249                 {
 250                     i_pes_header_size++;
 251                     if( MoveChunk( NULL, &p_data, &p_byte, 1 ) != 1 )
 252                     {
 253                         intf_WarnMsg( 1,
 254                             "PES packet too short to have a MPEG-1 header" );
 255                         input_DeletePES( p_input->p_method_data, p_pes );
 256                         p_pes = NULL;
 257                         return;
 258                     }
 259                 }
 260                 if( i_pes_header_size == 23 )
 261                 {
 262                     intf_ErrMsg( "input error: too much MPEG-1 stuffing" );
 263                     input_DeletePES( p_input->p_method_data, p_pes );
 264                     p_pes = NULL;
 265                     return;
 266                 }
 267
 268                 if( (*p_byte & 0xC0) == 0x40 )
 269                 {
 270                     /* Don't ask why... --Meuuh */
 271                     /* Erm... why ? --Sam */
 272                     /* Well... According to the recommendation, it is for
 273                      * STD_buffer_scale and STD_buffer_size. --Meuuh */
 274                     i_pes_header_size += 2;
 275                     if( MoveChunk( NULL, &p_data, &p_byte, 2 ) != 2 )
 276                     {
 277                         intf_WarnMsg( 1, "input: PES packet too short "
 278                                          "to have a MPEG-1 header" );
 279                         input_DeletePES( p_input->p_method_data, p_pes );
 280                         p_pes = NULL;
 281                         return;
 282                     }
 283                 }
 284
 285                 i_pes_header_size++;
 286
 287                 b_has_pts = *p_byte & 0x20;
 288                 b_has_dts = *p_byte & 0x10;
 289
 290                 if( b_has_pts )
 291                 {
 292                     byte_t      p_ts[5];
 293
 294                     i_pes_header_size += 4;
 295                     if( MoveChunk( p_ts, &p_data, &p_byte, 5 ) != 5 )
 296                     {
 297                         intf_WarnMsg( 1, "input: PES packet too short "
 298                                          "to have a MPEG-1 header" );
 299                         input_DeletePES( p_input->p_method_data, p_pes );
 300                         p_pes = NULL;
 301                         return;
 302                     }
 303
 304                     p_pes->i_pts = input_ClockGetTS( p_input, p_es->p_pgrm,
 305                        ( ((mtime_t)(p_ts[0] & 0x0E) << 29) |
 306                          (((mtime_t)U32_AT(p_ts) & 0xFFFE00) << 6) |
 307                          ((mtime_t)p_ts[3] << 7) |
 308                          ((mtime_t)p_ts[4] >> 1) ) );
 309
 310                     if( b_has_dts )
 311                     {
 312                         i_pes_header_size += 5;
 313                         if( MoveChunk( p_ts, &p_data, &p_byte, 5 ) != 5 )
 314                         {
 315                             intf_WarnMsg( 1, "input: PES packet too short "
 316                                              "to have a MPEG-1 header" );
 317                             input_DeletePES( p_input->p_method_data,
 318                                                     p_pes );
 319                             p_pes = NULL;
 320                             return;
 321                         }
 322
 323                         p_pes->i_dts = input_ClockGetTS( p_input,
 324                                                          p_es->p_pgrm,
 325                             ( ((mtime_t)(p_ts[0] & 0x0E) << 29) |
 326                               (((mtime_t)U32_AT(p_ts) & 0xFFFE00) << 6) |
 327                               ((mtime_t)p_ts[3] << 7) |
 328                               ((mtime_t)p_ts[4] >> 1) ) );
 329                     }
 330                 }
 331             }
 332
 333             break;
 334         }
 335
 336         if ( p_es->i_type == A52B_AUDIO_ES )
 337         {
 338             /* With A/52 audio, we need to skip the first 4 bytes */
 339             i_pes_header_size += 4;
 340         }
 341
 342         if( p_es->i_type == LPCMB_AUDIO_ES
 343              || p_es->i_type == DVDB_SPU_ES )
 344         {
 345             /* stream_private_id */
 346             i_pes_header_size += 1;
 347         }
 348
 349         /* Now we've parsed the header, we just have to indicate in some
 350          * specific data packets where the PES payload begins (renumber
 351          * p_payload_start), so that the decoders can find the beginning
 352          * of their data right out of the box. */
 353         p_data = p_pes->p_first;
 354         i_payload_size = p_data->p_payload_end
 355                                  - p_data->p_payload_start;
 356         while( i_pes_header_size > i_payload_size )
 357         {
 358             /* These packets are entirely filled by the PES header. */
 359             i_pes_header_size -= i_payload_size;
 360             p_data->p_payload_start = p_data->p_payload_end;
 361             /* Go to the next data packet. */
 362             if( (p_data = p_data->p_next) == NULL )
 363             {
 364                 intf_ErrMsg( "input error: PES header bigger than payload" );
 365                 input_DeletePES( p_input->p_method_data, p_pes );
 366                 p_pes = NULL;
 367                 return;
 368             }
 369             i_payload_size = p_data->p_payload_end
 370                                  - p_data->p_payload_start;
 371         }
 372         /* This last packet is partly header, partly payload. */
 373         if( i_payload_size < i_pes_header_size )
 374         {
 375             intf_ErrMsg( "input error: PES header bigger than payload" );
 376             input_DeletePES( p_input->p_method_data, p_pes );
 377             p_pes = NULL;
 378             return;
 379         }
 380         p_data->p_payload_start += i_pes_header_size;
 381
 382
 383         /* Now we can eventually put the PES packet in the decoder's
 384          * PES fifo */
 385         if( p_es->p_decoder_fifo != NULL )
 386         {
 387             input_DecodePES( p_es->p_decoder_fifo, p_pes );
 388         }
 389         else
 390         {
 391             intf_ErrMsg( "input error: no fifo to receive PES %p "
 392                          "(who wrote this damn code ?)", p_pes );
 393             input_DeletePES( p_input->p_method_data, p_pes );
 394         }
 395         p_pes = NULL;
 396     }
 397 #undef p_pes
 398
 399 }
 400
 401 /*****************************************************************************
 402  * input_GatherPES:
 403  *****************************************************************************
 404  * Gather a PES packet.
 405  *****************************************************************************/
 406 void input_GatherPES( input_thread_t * p_input, data_packet_t * p_data,
 407                       es_descriptor_t * p_es,
 408                       boolean_t b_unit_start, boolean_t b_packet_lost )
 409 {
 410 #define p_pes (p_es->p_pes)
 411
 412     /* If we lost data, insert a NULL data packet (philosophy : 0 is quite
 413      * often an escape sequence in decoders, so that should make them wait
 414      * for the next start code). */
 415     if( b_packet_lost )
 416     {
 417         input_NullPacket( p_input, p_es );
 418     }
 419
 420     if( b_unit_start && p_pes != NULL )
 421     {
 422         /* If the data packet contains the begining of a new PES packet, and
 423          * if we were reassembling a PES packet, then the PES should be
 424          * complete now, so parse its header and give it to the decoders. */
 425         input_ParsePES( p_input, p_es );
 426     }
 427
 428     if( !b_unit_start && p_pes == NULL )
 429     {
 430         /* Random access... */
 431         input_DeletePacket( p_input->p_method_data, p_data );
 432     }
 433     else
 434     {
 435         if( b_unit_start )
 436         {
 437             /* If we are at the beginning of a new PES packet, we must fetch
 438              * a new PES buffer to begin with the reassembly of this PES
 439              * packet. This is also here that we can synchronize with the
 440              * stream if we lost packets or if the decoder has just
 441              * started. */
 442             if( (p_pes = input_NewPES( p_input->p_method_data ) ) == NULL )
 443             {
 444                 intf_ErrMsg( "input error: out of memory" );
 445                 p_input->b_error = 1;
 446                 return;
 447             }
 448             p_pes->i_rate = p_input->stream.control.i_rate;
 449             p_pes->p_first = p_data;
 450
 451             /* If the PES header fits in the first data packet, we can
 452              * already set p_gather->i_pes_real_size. */
 453             if( p_data->p_payload_end - p_data->p_payload_start
 454                     >= PES_HEADER_SIZE )
 455             {
 456                 p_es->i_pes_real_size = ((u16)p_data->p_payload_start[4] << 8)
 457                                          + p_data->p_payload_start[5] + 6;
 458             }
 459             else
 460             {
 461                 p_es->i_pes_real_size = 0;
 462             }
 463         }
 464         else
 465         {
 466             /* Update the relations between the data packets */
 467             p_pes->p_last->p_next = p_data;
 468         }
 469
 470         p_pes->p_last = p_data;
 471         p_pes->i_nb_data++;
 472
 473         /* Size of the payload carried in the data packet */
 474         p_pes->i_pes_size += (p_data->p_payload_end
 475                                  - p_data->p_payload_start);
 476
 477         /* We can check if the packet is finished */
 478         if( p_pes->i_pes_size == p_es->i_pes_real_size )
 479         {
 480             /* The packet is finished, parse it */
 481             input_ParsePES( p_input, p_es );
 482         }
 483     }
 484 #undef p_pes
 485 }
 486
 487
 488 /*
 489  * PS Demultiplexing
 490  */
 491
 492 /*****************************************************************************
 493  * GetID: Get the ID of a stream
 494  *****************************************************************************/
 495 static u16 GetID( data_packet_t * p_data )
 496 {
 497     u16         i_id;
 498
 499     i_id = p_data->p_demux_start[3];                            /* stream_id */
 500     if( i_id == 0xBD )
 501     {
 502         /* FIXME : this is not valid if the header is split in multiple
 503          * packets */
 504         /* stream_private_id */
 505         i_id |= p_data->p_demux_start[ 9 + p_data->p_demux_start[8] ] << 8;
 506     }
 507     return( i_id );
 508 }
 509
 510 /*****************************************************************************
 511  * DecodePSM: Decode the Program Stream Map information
 512  *****************************************************************************
 513  * FIXME : loads are not aligned in this function
 514  *****************************************************************************/
 515 static void DecodePSM( input_thread_t * p_input, data_packet_t * p_data )
 516 {
 517     stream_ps_data_t *  p_demux =
 518                  (stream_ps_data_t *)p_input->stream.p_demux_data;
 519     byte_t *            p_byte;
 520     byte_t *            p_end;
 521     int                 i;
 522     int                 i_new_es_number = 0;
 523
 524     if( p_data->p_demux_start + 10 > p_data->p_payload_end )
 525     {
 526         intf_ErrMsg( "input error: PSM too short : packet corrupt" );
 527         return;
 528     }
 529
 530     if( p_demux->b_has_PSM
 531         && p_demux->i_PSM_version == (p_data->p_demux_start[6] & 0x1F) )
 532     {
 533         /* Already got that one. */
 534         return;
 535     }
 536
 537     p_demux->b_has_PSM = 1;
 538     p_demux->i_PSM_version = p_data->p_demux_start[6] & 0x1F;
 539
 540     /* Go to elementary_stream_map_length, jumping over
 541      * program_stream_info. */
 542     p_byte = p_data->p_demux_start + 10
 543               + U16_AT(&p_data->p_demux_start[8]);
 544     if( p_byte > p_data->p_payload_end )
 545     {
 546         intf_ErrMsg( "input error: PSM too short, packet corrupt" );
 547         return;
 548     }
 549     /* This is the full size of the elementary_stream_map.
 550      * 2 == elementary_stream_map_length
 551      * Please note that CRC_32 is not included in the length. */
 552     p_end = p_byte + 2 + U16_AT(p_byte);
 553     p_byte += 2;
 554     if( p_end > p_data->p_payload_end )
 555     {
 556         intf_ErrMsg( "input error: PSM too short, packet corrupt" );
 557         return;
 558     }
 559
 560     vlc_mutex_lock( &p_input->stream.stream_lock );
 561
 562     /* 4 == minimum useful size of a section */
 563     while( p_byte + 4 <= p_end )
 564     {
 565         es_descriptor_t *   p_es = NULL;
 566         u8                  i_stream_id = p_byte[1];
 567         /* FIXME: there will be a problem with private streams... (same
 568          * stream_id) */
 569
 570         /* Look for the ES in the ES table */
 571         for( i = i_new_es_number;
 572              i < p_input->stream.pp_programs[0]->i_es_number;
 573              i++ )
 574         {
 575             if( p_input->stream.pp_programs[0]->pp_es[i]->i_stream_id
 576                     == i_stream_id )
 577             {
 578                 p_es = p_input->stream.pp_programs[0]->pp_es[i];
 579                 if( p_es->i_type != p_byte[0] )
 580                 {
 581                     input_DelES( p_input, p_es );
 582                     p_es = NULL;
 583                 }
 584                 else
 585                 {
 586                     /* Move the ES to the beginning. */
 587                     p_input->stream.pp_programs[0]->pp_es[i]
 588                         = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
 589                     p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ]
 590                         = p_es;
 591                     i_new_es_number++;
 592                 }
 593                 break;
 594             }
 595         }
 596
 597         /* The goal is to have all the ES we have just read in the
 598          * beginning of the pp_es table, and all the others at the end,
 599          * so that we can close them more easily at the end. */
 600         if( p_es == NULL )
 601         {
 602             p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
 603                                 i_stream_id, 0 );
 604             p_es->i_type = p_byte[0];
 605             p_es->b_audio = ( p_es->i_type == MPEG1_AUDIO_ES
 606                               || p_es->i_type == MPEG2_AUDIO_ES
 607                               || p_es->i_type == AC3_AUDIO_ES
 608                               || p_es->i_type == A52B_AUDIO_ES
 609                               || p_es->i_type == LPCM_AUDIO_ES
 610                               || p_es->i_type == LPCMB_AUDIO_ES
 611                             );
 612
 613             /* input_AddES has inserted the new element at the end. */
 614             p_input->stream.pp_programs[0]->pp_es[
 615                 p_input->stream.pp_programs[0]->i_es_number ]
 616                 = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
 617             p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ] = p_es;
 618             i_new_es_number++;
 619         }
 620         p_byte += 4 + U16_AT(&p_byte[2]);
 621     }
 622
 623     /* Un-select the streams that are no longer parts of the program. */
 624     while( i_new_es_number < p_input->stream.pp_programs[0]->i_es_number )
 625     {
 626         /* We remove pp_es[i_new_es_member] and not pp_es[i] because the
 627          * list will be emptied starting from the end */
 628         input_DelES( p_input,
 629                      p_input->stream.pp_programs[0]->pp_es[i_new_es_number] );
 630     }
 631
 632     if( p_main->b_stats )
 633     {
 634         intf_StatMsg( "input info: The stream map after the PSM is now :" );
 635         input_DumpStream( p_input );
 636     }
 637
 638     vlc_mutex_unlock( &p_input->stream.stream_lock );
 639 }
 640
 641 /*****************************************************************************
 642  * input_ReadPS: store a PS packet into a data_buffer_t
 643  *****************************************************************************/
 644 #define PEEK( SIZE )                                                        \
 645     i_error = input_Peek( p_input, &p_peek, SIZE );                         \
 646     if( i_error == -1 )                                                     \
 647     {                                                                       \
 648         return( -1 );                                                       \
 649     }                                                                       \
 650     else if( i_error < SIZE )                                               \
 651     {                                                                       \
 652         /* EOF */                                                           \
 653         return( 0 );                                                        \
 654     }
 655
 656 ssize_t input_ReadPS( input_thread_t * p_input, data_packet_t ** pp_data )
 657 {
 658     byte_t *            p_peek;
 659     size_t              i_packet_size;
 660     ssize_t             i_error, i_read;
 661
 662     /* Read what we believe to be a packet header. */
 663     PEEK( 4 );
 664
 665     if( p_peek[0] || p_peek[1] || p_peek[2] != 1 || p_peek[3] < 0xB9 )
 666     {
 667         if( p_peek[0] || p_peek[1] || p_peek[2] )
 668         {
 669             /* It is common for MPEG-1 streams to pad with zeros
 670              * (although it is forbidden by the recommendation), so
 671              * don't bother everybody in this case. */
 672             intf_WarnMsg( 3, "input warning: garbage (0x%.2x%.2x%.2x%.2x)",
 673                  p_peek[0], p_peek[1], p_peek[2], p_peek[3] );
 674         }
 675
 676         /* This is not the startcode of a packet. Read the stream
 677          * until we find one. */
 678         while( p_peek[0] || p_peek[1] || p_peek[2] != 1 || p_peek[3] < 0xB9 )
 679         {
 680             p_input->p_current_data++;
 681             PEEK( 4 );
 682             if( p_input->b_die ) return( -1 );
 683         }
 684         /* Packet found. */
 685     }
 686
 687     /* 0x1B9 == SYSTEM_END_CODE, it is only 4 bytes long. */
 688     if( p_peek[3] != 0xB9 )
 689     {
 690         /* The packet is at least 6 bytes long. */
 691         PEEK( 6 );
 692
 693         if( p_peek[3] != 0xBA )
 694         {
 695             /* That's the case for all packets, except pack header. */
 696             i_packet_size = (p_peek[4] << 8) | p_peek[5];
 697         }
 698         else
 699         {
 700             /* Pack header. */
 701             if( (p_peek[4] & 0xC0) == 0x40 )
 702             {
 703                 /* MPEG-2 */
 704                 i_packet_size = 8;
 705             }
 706             else if( (p_peek[4] & 0xF0) == 0x20 )
 707             {
 708                 /* MPEG-1 */
 709                 i_packet_size = 6;
 710             }
 711             else
 712             {
 713                 intf_ErrMsg( "Unable to determine stream type" );
 714                 return( -1 );
 715             }
 716         }
 717     }
 718     else
 719     {
 720         /* System End Code */
 721         i_packet_size = -2;
 722     }
 723
 724     /* Fetch a packet of the appropriate size. */
 725     i_read = input_SplitBuffer( p_input, pp_data, i_packet_size + 6 );
 726     if( i_read <= 0 )
 727     {
 728         return( i_read );
 729     }
 730
 731     /* In MPEG-2 pack headers we still have to read stuffing bytes. */
 732     if( ((*pp_data)->p_demux_start[3] == 0xBA) && (i_packet_size == 8) )
 733     {
 734         size_t i_stuffing = ((*pp_data)->p_demux_start[13] & 0x7);
 735         /* Force refill of the input buffer - though we don't care
 736          * about p_peek. Please note that this is unoptimized. */
 737         PEEK( i_stuffing );
 738         p_input->p_current_data += i_stuffing;
 739     }
 740
 741     return( 1 );
 742 }
 743
 744 #undef PEEK
 745
 746 /*****************************************************************************
 747  * input_ParsePS: read the PS header
 748  *****************************************************************************/
 749 es_descriptor_t * input_ParsePS( input_thread_t * p_input,
 750                                  data_packet_t * p_data )
 751 {
 752     u32                 i_code;
 753     es_descriptor_t *   p_es = NULL;
 754
 755     i_code = p_data->p_demux_start[3];
 756
 757     if( i_code > 0xBC ) /* ES start code */
 758     {
 759         u16                 i_id;
 760         int                 i_dummy;
 761
 762         /* This is a PES packet. Find out if we want it or not. */
 763         i_id = GetID( p_data );
 764
 765         vlc_mutex_lock( &p_input->stream.stream_lock );
 766         if( p_input->stream.pp_programs[0]->b_is_ok )
 767         {
 768             /* Look only at the selected ES. */
 769             for( i_dummy = 0; i_dummy < p_input->stream.i_selected_es_number;
 770                  i_dummy++ )
 771             {
 772                 if( p_input->stream.pp_selected_es[i_dummy] != NULL
 773                     && p_input->stream.pp_selected_es[i_dummy]->i_id == i_id )
 774                 {
 775                     p_es = p_input->stream.pp_selected_es[i_dummy];
 776                     break;
 777                 }
 778             }
 779         }
 780         else
 781         {
 782             stream_ps_data_t * p_demux =
 783               (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
 784
 785             /* Search all ES ; if not found -> AddES */
 786             p_es = input_FindES( p_input, i_id );
 787
 788             if( p_es == NULL && !p_demux->b_has_PSM )
 789             {
 790                 p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
 791                                     i_id, 0 );
 792                 if( p_es != NULL )
 793                 {
 794                     p_es->i_stream_id = p_data->p_demux_start[3];
 795
 796                     /* Set stream type and auto-spawn. */
 797                     if( (i_id & 0xF0) == 0xE0 )
 798                     {
 799                         /* MPEG video */
 800                         p_es->i_type = MPEG2_VIDEO_ES;
 801                         p_es->i_cat = VIDEO_ES;
 802 #ifdef AUTO_SPAWN
 803                         if( !p_input->stream.b_seekable )
 804                             input_SelectES( p_input, p_es );
 805 #endif
 806                     }
 807                     else if( (i_id & 0xE0) == 0xC0 )
 808                     {
 809                         /* MPEG audio */
 810                         p_es->i_type = MPEG2_AUDIO_ES;
 811                         p_es->b_audio = 1;
 812                         p_es->i_cat = AUDIO_ES;
 813 #ifdef AUTO_SPAWN
 814                         if( !p_input->stream.b_seekable )
 815                         if( config_GetIntVariable( "audio-channel" )
 816                                 == (p_es->i_id & 0x1F) ||
 817                             ( config_GetIntVariable( "audio-channel" ) < 0
 818                               && !(p_es->i_id & 0x1F) ) )
 819                         switch( config_GetIntVariable( "audio-type" ) )
 820                         {
 821                         case -1:
 822                         case REQUESTED_MPEG:
 823                             input_SelectES( p_input, p_es );
 824                         }
 825 #endif
 826                     }
 827                     else if( (i_id & 0xF0FF) == 0x80BD )
 828                     {
 829                         /* AC3 audio (0x80->0x8F) */
 830                         p_es->i_type = A52B_AUDIO_ES;
 831                         p_es->b_audio = 1;
 832                         p_es->i_cat = AUDIO_ES;
 833 #ifdef AUTO_SPAWN
 834                         if( !p_input->stream.b_seekable )
 835                         if( config_GetIntVariable( "audio-channel" )
 836                                 == ((p_es->i_id & 0xF00) >> 8) ||
 837                             ( config_GetIntVariable( "audio-channel" ) < 0
 838                               && !((p_es->i_id & 0xF00) >> 8)) )
 839                         switch( config_GetIntVariable( "audio-type" ) )
 840                         {
 841                         case -1:
 842                         case REQUESTED_AC3:
 843                             input_SelectES( p_input, p_es );
 844                         }
 845 #endif
 846                     }
 847                     else if( (i_id & 0xE0FF) == 0x20BD )
 848                     {
 849                         /* Subtitles video (0x20->0x3F) */
 850                         p_es->i_type = DVDB_SPU_ES;
 851                         p_es->i_cat = SPU_ES;
 852 #ifdef AUTO_SPAWN
 853                         if( config_GetIntVariable( "spu-channel" )
 854                                 == ((p_es->i_id & 0x1F00) >> 8) )
 855                         {
 856                             if( !p_input->stream.b_seekable )
 857                                 input_SelectES( p_input, p_es );
 858                         }
 859 #endif
 860                     }
 861                     else if( (i_id & 0xF0FF) == 0xA0BD )
 862                     {
 863                         /* LPCM audio (0xA0->0xAF) */
 864                         p_es->i_type = LPCMB_AUDIO_ES;
 865                         p_es->b_audio = 1;
 866                         p_es->i_cat = AUDIO_ES;
 867                     }
 868                     else
 869                     {
 870                         p_es->i_type = UNKNOWN_ES;
 871                     }
 872                 }
 873
 874                 /* Tell the interface the stream has changed */
 875                 p_input->stream.b_changed = 1;
 876             }
 877         } /* stream.b_is_ok */
 878         vlc_mutex_unlock( &p_input->stream.stream_lock );
 879     } /* i_code > 0xBC */
 880
 881     return( p_es );
 882 }
 883
 884 /*****************************************************************************
 885  * input_DemuxPS: first step of demultiplexing: the PS header
 886  *****************************************************************************/
 887 void input_DemuxPS( input_thread_t * p_input, data_packet_t * p_data )
 888 {
 889     u32                 i_code;
 890     boolean_t           b_trash = 0;
 891     es_descriptor_t *   p_es = NULL;
 892
 893     i_code = ((u32)p_data->p_demux_start[0] << 24)
 894                 | ((u32)p_data->p_demux_start[1] << 16)
 895                 | ((u32)p_data->p_demux_start[2] << 8)
 896                 | p_data->p_demux_start[3];
 897     if( i_code <= 0x1BC )
 898     {
 899         switch( i_code )
 900         {
 901         case 0x1BA: /* PACK_START_CODE */
 902             {
 903                 /* Read the SCR. */
 904                 mtime_t         scr_time;
 905                 u32             i_mux_rate;
 906
 907                 if( (p_data->p_demux_start[4] & 0xC0) == 0x40 )
 908                 {
 909                     /* MPEG-2 */
 910                     byte_t      p_header[14];
 911                     byte_t *    p_byte;
 912                     p_byte = p_data->p_demux_start;
 913
 914                     if( MoveChunk( p_header, &p_data, &p_byte, 14 ) != 14 )
 915                     {
 916                         intf_WarnMsg( 1, "input: packet too short "
 917                                          "to have a header" );
 918                         b_trash = 1;
 919                         break;
 920                     }
 921                     scr_time =
 922                          ((mtime_t)(p_header[4] & 0x38) << 27) |
 923                          ((mtime_t)(U32_AT(p_header + 4) & 0x03FFF800)
 924                                         << 4) |
 925                          ((( ((mtime_t)U16_AT(p_header + 6) << 16)
 926                             | (mtime_t)U16_AT(p_header + 8) ) & 0x03FFF800)
 927                                         >> 11);
 928
 929                     /* mux_rate */
 930                     i_mux_rate = ((u32)U16_AT(p_header + 10) << 6)
 931                                    | (p_header[12] >> 2);
 932                     /* FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
 933                      * This is the biggest kludge ever !
 934                      * I don't know what's wrong with mux_rate calculation
 935                      * but this heuristic work well : */
 936                     i_mux_rate <<= 1;
 937                     i_mux_rate /= 3;
 938                 }
 939                 else
 940                 {
 941                     /* MPEG-1 SCR is like PTS. */
 942                     byte_t      p_header[12];
 943                     byte_t *    p_byte;
 944                     p_byte = p_data->p_demux_start;
 945
 946                     if( MoveChunk( p_header, &p_data, &p_byte, 12 ) != 12 )
 947                     {
 948                         intf_WarnMsg( 1, "input: packet too short "
 949                                          "to have a header" );
 950                         b_trash = 1;
 951                         break;
 952                     }
 953                     scr_time =
 954                          ((mtime_t)(p_header[4] & 0x0E) << 29) |
 955                          (((mtime_t)U32_AT(p_header + 4) & 0xFFFE00) << 6) |
 956                          ((mtime_t)p_header[7] << 7) |
 957                          ((mtime_t)p_header[8] >> 1);
 958
 959                     /* mux_rate */
 960                     i_mux_rate = (U32_AT(p_header + 8) & 0x7FFFFE) >> 1;
 961                 }
 962                 /* Call the pace control. */
 963                 input_ClockManageRef( p_input,
 964                                       p_input->stream.p_selected_program,
 965                                       scr_time );
 966
 967                 if( i_mux_rate != p_input->stream.i_mux_rate
 968                      && p_input->stream.i_mux_rate )
 969                 {
 970                     intf_WarnMsg( 2, "input: mux_rate changed, "
 971                                      "expect cosmetic errors" );
 972                 }
 973                 p_input->stream.i_mux_rate = i_mux_rate;
 974
 975                 b_trash = 1;
 976             }
 977             break;
 978
 979         case 0x1BB: /* SYSTEM_START_CODE */
 980             b_trash = 1;                              /* Nothing interesting */
 981             break;
 982
 983         case 0x1BC: /* PROGRAM_STREAM_MAP_CODE */
 984             DecodePSM( p_input, p_data );
 985             b_trash = 1;
 986             break;
 987
 988         case 0x1B9: /* PROGRAM_END_CODE */
 989             b_trash = 1;
 990             break;
 991
 992         default:
 993             /* This should not happen */
 994             b_trash = 1;
 995             intf_WarnMsg( 3, "input: unwanted packet received "
 996                              "with start code 0x%.8x", i_code );
 997         }
 998     }
 999     else
1000     {
1001         p_es = input_ParsePS( p_input, p_data );
1002
1003         vlc_mutex_lock( &p_input->stream.control.control_lock );
1004         if( p_es != NULL && p_es->p_decoder_fifo != NULL
1005              && (!p_es->b_audio || !p_input->stream.control.b_mute) )
1006         {
1007             vlc_mutex_unlock( &p_input->stream.control.control_lock );
1008             p_es->c_packets++;
1009             input_GatherPES( p_input, p_data, p_es, 1, 0 );
1010         }
1011         else
1012         {
1013             vlc_mutex_unlock( &p_input->stream.control.control_lock );
1014             b_trash = 1;
1015         }
1016     }
1017
1018     /* Trash the packet if it has no payload or if it isn't selected */
1019     if( b_trash )
1020     {
1021         input_DeletePacket( p_input->p_method_data, p_data );
1022         p_input->stream.c_packets_trashed++;
1023     }
1024 }
1025
1026
1027 /*
1028  * TS Demultiplexing
1029  */
1030
1031 /*****************************************************************************
1032  * input_ReadTS: store a TS packet into a data_buffer_t
1033  *****************************************************************************/
1034 #define PEEK( SIZE )                                                        \
1035     i_error = input_Peek( p_input, &p_peek, SIZE );                         \
1036     if( i_error == -1 )                                                     \
1037     {                                                                       \
1038         return( -1 );                                                       \
1039     }                                                                       \
1040     else if( i_error < SIZE )                                               \
1041     {                                                                       \
1042         /* EOF */                                                           \
1043         return( 0 );                                                        \
1044     }
1045
1046 ssize_t input_ReadTS( input_thread_t * p_input, data_packet_t ** pp_data )
1047 {
1048     byte_t *            p_peek;
1049     ssize_t             i_error, i_read;
1050
1051     PEEK( 1 );
1052
1053     if( *p_peek != TS_SYNC_CODE )
1054     {
1055         intf_WarnMsg( 3, "input warning: garbage at input (%x)", *p_peek );
1056
1057         if( p_input->i_mtu )
1058         {
1059             while( *p_peek != TS_SYNC_CODE )
1060             {
1061                 /* Try to resync on next packet. */
1062                 PEEK( TS_PACKET_SIZE );
1063                 p_input->p_current_data += TS_PACKET_SIZE;
1064                 PEEK( 1 );
1065             }
1066         }
1067         else
1068         {
1069             /* Move forward until we find 0x47 (and hope it's the good
1070              * one... FIXME) */
1071             while( *p_peek != TS_SYNC_CODE )
1072             {
1073                 p_input->p_current_data++;
1074                 PEEK( 1 );
1075             }
1076         }
1077     }
1078
1079     i_read = input_SplitBuffer( p_input, pp_data, TS_PACKET_SIZE );
1080     if( i_read <= 0 )
1081     {
1082         return( i_read );
1083     }
1084
1085     return( 1 );
1086 }
1087
1088 /*****************************************************************************
1089  * input_DemuxTS: first step of demultiplexing: the TS header
1090  *****************************************************************************/
1091 void input_DemuxTS( input_thread_t * p_input, data_packet_t * p_data,
1092                         psi_callback_t pf_psi_callback )
1093 {
1094     u16                 i_pid;
1095     int                 i_dummy;
1096     boolean_t           b_adaptation;         /* Adaptation field is present */
1097     boolean_t           b_payload;                 /* Packet carries payload */
1098     boolean_t           b_unit_start;  /* A PSI or a PES start in the packet */
1099     boolean_t           b_trash = 0;             /* Is the packet unuseful ? */
1100     boolean_t           b_lost = 0;             /* Was there a packet loss ? */
1101     boolean_t           b_psi = 0;                        /* Is this a PSI ? */
1102     boolean_t           b_pcr = 0;                   /* Does it have a PCR ? */
1103     es_descriptor_t *   p_es = NULL;
1104     es_ts_data_t *      p_es_demux = NULL;
1105     pgrm_ts_data_t *    p_pgrm_demux = NULL;
1106
1107 #define p (p_data->p_demux_start)
1108     /* Extract flags values from TS common header. */
1109     i_pid = ((p[1] & 0x1F) << 8) | p[2];
1110     b_unit_start = (p[1] & 0x40);
1111     b_adaptation = (p[3] & 0x20);
1112     b_payload = (p[3] & 0x10);
1113
1114     /* Find out the elementary stream. */
1115     vlc_mutex_lock( &p_input->stream.stream_lock );
1116
1117     for( i_dummy = 0; i_dummy < p_input->stream.i_pgrm_number; i_dummy ++ )
1118     {
1119         if( (( pgrm_ts_data_t * ) p_input->stream.pp_programs[i_dummy]->
1120                     p_demux_data)->i_pcr_pid == i_pid )
1121         {
1122             b_pcr = 1;
1123             break;
1124         }
1125     }
1126
1127     p_es= input_FindES( p_input, i_pid );
1128
1129     if( (p_es != NULL) && (p_es->p_demux_data != NULL) )
1130     {
1131         p_es_demux = (es_ts_data_t *)p_es->p_demux_data;
1132
1133         if( p_es_demux->b_psi )
1134         {
1135             b_psi = 1;
1136         }
1137         else
1138         {
1139             p_pgrm_demux = (pgrm_ts_data_t *)p_es->p_pgrm->p_demux_data;
1140         }
1141     }
1142
1143     vlc_mutex_lock( &p_input->stream.control.control_lock );
1144     if( ( p_es == NULL ) || (p_es->b_audio && p_input->stream.control.b_mute) )
1145     {
1146         /* Not selected. Just read the adaptation field for a PCR. */
1147         b_trash = 1;
1148     }
1149     else if( p_es->p_decoder_fifo == NULL && !b_psi )
1150     {
1151         b_trash = 1;
1152     }
1153
1154     vlc_mutex_unlock( &p_input->stream.control.control_lock );
1155     vlc_mutex_unlock( &p_input->stream.stream_lock );
1156
1157
1158     /* Don't change the order of the tests : if b_psi then p_pgrm_demux
1159      * may still be null. Who said it was ugly ?
1160      * I have written worse. --Meuuh */
1161     if( ( p_es  ) &&
1162         ((p_es->p_decoder_fifo != NULL) || b_psi || b_pcr ) )
1163     {
1164         p_es->c_packets++;
1165
1166         /* Extract adaptation field information if any */
1167
1168         if( !b_adaptation )
1169         {
1170             /* We don't have any adaptation_field, so payload starts
1171              * immediately after the 4 byte TS header */
1172             p_data->p_payload_start += 4;
1173         }
1174         else
1175         {
1176             /* p[4] is adaptation_field_length minus one */
1177             p_data->p_payload_start += 5 + p[4];
1178
1179             /* The adaptation field can be limited to the
1180              * adaptation_field_length byte, so that there is nothing to do:
1181              * skip this possibility */
1182             if( p[4] )
1183             {
1184                 /* If the packet has both adaptation_field and payload,
1185                  * adaptation_field cannot be more than 182 bytes long; if
1186                  * there is only an adaptation_field, it must fill the next
1187                  * 183 bytes. */
1188                 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
1189                 {
1190                     intf_WarnMsg( 2,
1191                         "input: invalid TS adaptation field (%p)",
1192                         p_data );
1193                     p_data->b_discard_payload = 1;
1194                     p_es->c_invalid_packets++;
1195                 }
1196
1197                 /* Now we are sure that the byte containing flags is present:
1198                  * read it */
1199                 else
1200                 {
1201                     /* discontinuity_indicator */
1202                     if( p[5] & 0x80 )
1203                     {
1204                         intf_WarnMsg( 2,
1205                             "input: discontinuity_indicator"
1206                             " encountered by TS demux (position read: %d,"
1207                             " saved: %d)",
1208                             p[5] & 0x80, p_es_demux->i_continuity_counter );
1209
1210                         /* If the PID carries the PCR, there will be a system
1211                          * time-based discontinuity. We let the PCR decoder
1212                          * handle that. */
1213                         p_es->p_pgrm->i_synchro_state = SYNCHRO_REINIT;
1214
1215                         /* There also may be a continuity_counter
1216                          * discontinuity: resynchronize our counter with
1217                          * the one of the stream. */
1218                         p_es_demux->i_continuity_counter = (p[3] & 0x0f) - 1;
1219                     }
1220
1221                 } /* valid TS adaptation field ? */
1222             } /* length > 0 */
1223         } /* has adaptation field */
1224         /* Check the continuity of the stream. */
1225         i_dummy = ((p[3] & 0x0f) - p_es_demux->i_continuity_counter) & 0x0f;
1226         if( i_dummy == 1 )
1227         {
1228             /* Everything is ok, just increase our counter */
1229             (p_es_demux->i_continuity_counter)++;
1230         }
1231         else
1232         {
1233             if( !b_payload && i_dummy == 0 )
1234             {
1235                 /* This is a packet without payload, this is allowed by the
1236                  * draft. As there is nothing interesting in this packet
1237                  * (except PCR that have already been handled), we can trash
1238                  * the packet. */
1239                 b_trash = 1;
1240             }
1241             else if( i_dummy <= 0 )
1242             {
1243                 /* Duplicate packet: mark it as being to be trashed. */
1244                 intf_WarnMsg( 3, "input: duplicate packet received "
1245                                  "by TS demux" );
1246                 b_trash = 1;
1247             }
1248             else if( p_es_demux->i_continuity_counter == 0xFF )
1249             {
1250                 /* This means that the packet is the first one we receive for
1251                  * this ES since the continuity counter ranges between 0 and
1252                  * 0x0F excepts when it has been initialized by the input:
1253                  * init the counter to the correct value. */
1254                 intf_WarnMsg( 3, "input: first packet for PID %d received "
1255                              "by TS demux", p_es->i_id );
1256                 p_es_demux->i_continuity_counter = (p[3] & 0x0f);
1257             }
1258             else
1259             {
1260                 /* This can indicate that we missed a packet or that the
1261                  * continuity_counter wrapped and we received a dup packet:
1262                  * as we don't know, do as if we missed a packet to be sure
1263                  * to recover from this situation */
1264                 intf_WarnMsg( 2, "input: packet lost by TS demux: "
1265                                  "current %d, packet %d",
1266                               p_es_demux->i_continuity_counter & 0x0f,
1267                               p[3] & 0x0f );
1268                 b_lost = 1;
1269                 p_es_demux->i_continuity_counter = p[3] & 0x0f;
1270             } /* not continuous */
1271         } /* continuity */
1272     } /* if selected or PCR */
1273
1274     /* Handle PCR */
1275     if( b_pcr && b_adaptation && (p[5] & 0x10) && p[4]>=7 )
1276     {
1277         /* Read the PCR. */
1278         mtime_t     pcr_time;
1279         pcr_time = ( (mtime_t)p[6] << 25 ) |
1280                    ( (mtime_t)p[7] << 17 ) |
1281                    ( (mtime_t)p[8] << 9 ) |
1282                    ( (mtime_t)p[9] << 1 ) |
1283                    ( (mtime_t)p[10] >> 7 );
1284         /* Call the pace control. */
1285         for( i_dummy = 0; i_dummy < p_input->stream.i_pgrm_number;
1286                                 i_dummy ++ )
1287         {
1288             if( ( ( pgrm_ts_data_t * ) p_input->stream.pp_programs[i_dummy]->
1289                         p_demux_data )->i_pcr_pid == i_pid )
1290             {
1291                 input_ClockManageRef( p_input,
1292                     p_input->stream.pp_programs[i_dummy], pcr_time );
1293             }
1294         }
1295
1296     }
1297
1298     /* Trash the packet if it has no payload or if it isn't selected */
1299     if( b_trash )
1300     {
1301         input_DeletePacket( p_input->p_method_data, p_data );
1302         p_input->stream.c_packets_trashed++;
1303     }
1304     else
1305     {
1306         if( b_psi )
1307         {
1308             /* The payload contains PSI tables */
1309             (* pf_psi_callback) ( p_input, p_data, p_es, b_unit_start );
1310         }
1311         else
1312         {
1313             /* The payload carries a PES stream */
1314             input_GatherPES( p_input, p_data, p_es, b_unit_start, b_lost );
1315         }
1316
1317     }
1318
1319 #undef p
1320
1321 }