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 2002/05/27 16:01:42 fenrir 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_stream_id == 0xbd )
 337         {
 338             /* With private stream 1, the first byte of the payload
 339              * is a stream_private_id, so skip it. */
 340             i_pes_header_size++;
 341         }
 342
 343         if( p_es->i_type == AC3_AUDIO_ES )
 344         {
 345             /* With ac3 audio, we need to skip first 3 bytes */
 346             i_pes_header_size += 3;
 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 == LPCM_AUDIO_ES
 609                             );
 610
 611             /* input_AddES has inserted the new element at the end. */
 612             p_input->stream.pp_programs[0]->pp_es[
 613                 p_input->stream.pp_programs[0]->i_es_number ]
 614                 = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
 615             p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ] = p_es;
 616             i_new_es_number++;
 617         }
 618         p_byte += 4 + U16_AT(&p_byte[2]);
 619     }
 620
 621     /* Un-select the streams that are no longer parts of the program. */
 622     while( i_new_es_number < p_input->stream.pp_programs[0]->i_es_number )
 623     {
 624         /* We remove pp_es[i_new_es_member] and not pp_es[i] because the
 625          * list will be emptied starting from the end */
 626         input_DelES( p_input,
 627                      p_input->stream.pp_programs[0]->pp_es[i_new_es_number] );
 628     }
 629
 630     if( p_main->b_stats )
 631     {
 632         intf_StatMsg( "input info: The stream map after the PSM is now :" );
 633         input_DumpStream( p_input );
 634     }
 635
 636     vlc_mutex_unlock( &p_input->stream.stream_lock );
 637 }
 638
 639 /*****************************************************************************
 640  * input_ReadPS: store a PS packet into a data_buffer_t
 641  *****************************************************************************/
 642 #define PEEK( SIZE )                                                        \
 643     i_error = input_Peek( p_input, &p_peek, SIZE );                         \
 644     if( i_error == -1 )                                                     \
 645     {                                                                       \
 646         return( -1 );                                                       \
 647     }                                                                       \
 648     else if( i_error < SIZE )                                               \
 649     {                                                                       \
 650         /* EOF */                                                           \
 651         return( 0 );                                                        \
 652     }
 653
 654 ssize_t input_ReadPS( input_thread_t * p_input, data_packet_t ** pp_data )
 655 {
 656     byte_t *            p_peek;
 657     size_t              i_packet_size;
 658     ssize_t             i_error, i_read;
 659
 660     /* Read what we believe to be a packet header. */
 661     PEEK( 4 );
 662
 663     if( p_peek[0] || p_peek[1] || p_peek[2] != 1 || p_peek[3] < 0xB9 )
 664     {
 665         if( p_peek[0] || p_peek[1] || p_peek[2] )
 666         {
 667             /* It is common for MPEG-1 streams to pad with zeros
 668              * (although it is forbidden by the recommendation), so
 669              * don't bother everybody in this case. */
 670             intf_WarnMsg( 3, "input warning: garbage (0x%.2x%.2x%.2x%.2x)",
 671                  p_peek[0], p_peek[1], p_peek[2], p_peek[3] );
 672         }
 673
 674         /* This is not the startcode of a packet. Read the stream
 675          * until we find one. */
 676         while( p_peek[0] || p_peek[1] || p_peek[2] != 1 || p_peek[3] < 0xB9 )
 677         {
 678             p_input->p_current_data++;
 679             PEEK( 4 );
 680             if( p_input->b_die ) return( -1 );
 681         }
 682         /* Packet found. */
 683     }
 684
 685     /* 0x1B9 == SYSTEM_END_CODE, it is only 4 bytes long. */
 686     if( p_peek[3] != 0xB9 )
 687     {
 688         /* The packet is at least 6 bytes long. */
 689         PEEK( 6 );
 690
 691         if( p_peek[3] != 0xBA )
 692         {
 693             /* That's the case for all packets, except pack header. */
 694             i_packet_size = (p_peek[4] << 8) | p_peek[5];
 695         }
 696         else
 697         {
 698             /* Pack header. */
 699             if( (p_peek[4] & 0xC0) == 0x40 )
 700             {
 701                 /* MPEG-2 */
 702                 i_packet_size = 8;
 703             }
 704             else if( (p_peek[4] & 0xF0) == 0x20 )
 705             {
 706                 /* MPEG-1 */
 707                 i_packet_size = 6;
 708             }
 709             else
 710             {
 711                 intf_ErrMsg( "Unable to determine stream type" );
 712                 return( -1 );
 713             }
 714         }
 715     }
 716     else
 717     {
 718         /* System End Code */
 719         i_packet_size = -2;
 720     }
 721
 722     /* Fetch a packet of the appropriate size. */
 723     i_read = input_SplitBuffer( p_input, pp_data, i_packet_size + 6 );
 724     if( i_read <= 0 )
 725     {
 726         return( i_read );
 727     }
 728
 729     /* In MPEG-2 pack headers we still have to read stuffing bytes. */
 730     if( ((*pp_data)->p_demux_start[3] == 0xBA) && (i_packet_size == 8) )
 731     {
 732         size_t i_stuffing = ((*pp_data)->p_demux_start[13] & 0x7);
 733         /* Force refill of the input buffer - though we don't care
 734          * about p_peek. Please note that this is unoptimized. */
 735         PEEK( i_stuffing );
 736         p_input->p_current_data += i_stuffing;
 737     }
 738
 739     return( 1 );
 740 }
 741
 742 #undef PEEK
 743
 744 /*****************************************************************************
 745  * input_ParsePS: read the PS header
 746  *****************************************************************************/
 747 es_descriptor_t * input_ParsePS( input_thread_t * p_input,
 748                                  data_packet_t * p_data )
 749 {
 750     u32                 i_code;
 751     es_descriptor_t *   p_es = NULL;
 752
 753     i_code = p_data->p_demux_start[3];
 754
 755     if( i_code > 0xBC ) /* ES start code */
 756     {
 757         u16                 i_id;
 758         int                 i_dummy;
 759
 760         /* This is a PES packet. Find out if we want it or not. */
 761         i_id = GetID( p_data );
 762
 763         vlc_mutex_lock( &p_input->stream.stream_lock );
 764         if( p_input->stream.pp_programs[0]->b_is_ok )
 765         {
 766             /* Look only at the selected ES. */
 767             for( i_dummy = 0; i_dummy < p_input->stream.i_selected_es_number;
 768                  i_dummy++ )
 769             {
 770                 if( p_input->stream.pp_selected_es[i_dummy] != NULL
 771                     && p_input->stream.pp_selected_es[i_dummy]->i_id == i_id )
 772                 {
 773                     p_es = p_input->stream.pp_selected_es[i_dummy];
 774                     break;
 775                 }
 776             }
 777         }
 778         else
 779         {
 780             stream_ps_data_t * p_demux =
 781               (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
 782
 783             /* Search all ES ; if not found -> AddES */
 784             p_es = input_FindES( p_input, i_id );
 785
 786             if( p_es == NULL && !p_demux->b_has_PSM )
 787             {
 788                 p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
 789                                     i_id, 0 );
 790                 if( p_es != NULL )
 791                 {
 792                     p_es->i_stream_id = p_data->p_demux_start[3];
 793
 794                     /* Set stream type and auto-spawn. */
 795                     if( (i_id & 0xF0) == 0xE0 )
 796                     {
 797                         /* MPEG video */
 798                         p_es->i_type = MPEG2_VIDEO_ES;
 799                         p_es->i_cat = VIDEO_ES;
 800 #ifdef AUTO_SPAWN
 801                         if( !p_input->stream.b_seekable )
 802                             input_SelectES( p_input, p_es );
 803 #endif
 804                     }
 805                     else if( (i_id & 0xE0) == 0xC0 )
 806                     {
 807                         /* MPEG audio */
 808                         p_es->i_type = MPEG2_AUDIO_ES;
 809                         p_es->b_audio = 1;
 810                         p_es->i_cat = AUDIO_ES;
 811 #ifdef AUTO_SPAWN
 812                         if( !p_input->stream.b_seekable )
 813                         if( config_GetIntVariable( "audio-channel" )
 814                                 == (p_es->i_id & 0x1F) ||
 815                             ( config_GetIntVariable( "audio-channel" ) < 0
 816                               && !(p_es->i_id & 0x1F) ) )
 817                         switch( config_GetIntVariable( "audio-type" ) )
 818                         {
 819                         case -1:
 820                         case REQUESTED_MPEG:
 821                             input_SelectES( p_input, p_es );
 822                         }
 823 #endif
 824                     }
 825                     else if( (i_id & 0xF0FF) == 0x80BD )
 826                     {
 827                         /* AC3 audio (0x80->0x8F) */
 828                         p_es->i_type = AC3_AUDIO_ES;
 829                         p_es->b_audio = 1;
 830                         p_es->i_cat = AUDIO_ES;
 831 #ifdef AUTO_SPAWN
 832                         if( !p_input->stream.b_seekable )
 833                         if( config_GetIntVariable( "audio-channel" )
 834                                 == ((p_es->i_id & 0xF00) >> 8) ||
 835                             ( config_GetIntVariable( "audio-channel" ) < 0
 836                               && !((p_es->i_id & 0xF00) >> 8)) )
 837                         switch( config_GetIntVariable( "audio-type" ) )
 838                         {
 839                         case -1:
 840                         case REQUESTED_AC3:
 841                             input_SelectES( p_input, p_es );
 842                         }
 843 #endif
 844                     }
 845                     else if( (i_id & 0xE0FF) == 0x20BD )
 846                     {
 847                         /* Subtitles video (0x20->0x3F) */
 848                         p_es->i_type = DVD_SPU_ES;
 849                         p_es->i_cat = SPU_ES;
 850 #ifdef AUTO_SPAWN
 851                         if( config_GetIntVariable( "spu-channel" )
 852                                 == ((p_es->i_id & 0x1F00) >> 8) )
 853                         {
 854                             if( !p_input->stream.b_seekable )
 855                                 input_SelectES( p_input, p_es );
 856                         }
 857 #endif
 858                     }
 859                     else if( (i_id & 0xF0FF) == 0xA0BD )
 860                     {
 861                         /* LPCM audio (0xA0->0xAF) */
 862                         p_es->i_type = LPCM_AUDIO_ES;
 863                         p_es->b_audio = 1;
 864                         p_es->i_cat = AUDIO_ES;
 865                     }
 866                     else
 867                     {
 868                         p_es->i_type = UNKNOWN_ES;
 869                     }
 870                 }
 871
 872                 /* Tell the interface the stream has changed */
 873                 p_input->stream.b_changed = 1;
 874             }
 875         } /* stream.b_is_ok */
 876         vlc_mutex_unlock( &p_input->stream.stream_lock );
 877     } /* i_code > 0xBC */
 878
 879     return( p_es );
 880 }
 881
 882 /*****************************************************************************
 883  * input_DemuxPS: first step of demultiplexing: the PS header
 884  *****************************************************************************/
 885 void input_DemuxPS( input_thread_t * p_input, data_packet_t * p_data )
 886 {
 887     u32                 i_code;
 888     boolean_t           b_trash = 0;
 889     es_descriptor_t *   p_es = NULL;
 890
 891     i_code = ((u32)p_data->p_demux_start[0] << 24)
 892                 | ((u32)p_data->p_demux_start[1] << 16)
 893                 | ((u32)p_data->p_demux_start[2] << 8)
 894                 | p_data->p_demux_start[3];
 895     if( i_code <= 0x1BC )
 896     {
 897         switch( i_code )
 898         {
 899         case 0x1BA: /* PACK_START_CODE */
 900             {
 901                 /* Read the SCR. */
 902                 mtime_t         scr_time;
 903                 u32             i_mux_rate;
 904
 905                 if( (p_data->p_demux_start[4] & 0xC0) == 0x40 )
 906                 {
 907                     /* MPEG-2 */
 908                     byte_t      p_header[14];
 909                     byte_t *    p_byte;
 910                     p_byte = p_data->p_demux_start;
 911
 912                     if( MoveChunk( p_header, &p_data, &p_byte, 14 ) != 14 )
 913                     {
 914                         intf_WarnMsg( 1, "input: packet too short "
 915                                          "to have a header" );
 916                         b_trash = 1;
 917                         break;
 918                     }
 919                     scr_time =
 920                          ((mtime_t)(p_header[4] & 0x38) << 27) |
 921                          ((mtime_t)(U32_AT(p_header + 4) & 0x03FFF800)
 922                                         << 4) |
 923                          ((( ((mtime_t)U16_AT(p_header + 6) << 16)
 924                             | (mtime_t)U16_AT(p_header + 8) ) & 0x03FFF800)
 925                                         >> 11);
 926
 927                     /* mux_rate */
 928                     i_mux_rate = ((u32)U16_AT(p_header + 10) << 6)
 929                                    | (p_header[12] >> 2);
 930                     /* FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
 931                      * This is the biggest kludge ever !
 932                      * I don't know what's wrong with mux_rate calculation
 933                      * but this heuristic work well : */
 934                     i_mux_rate <<= 1;
 935                     i_mux_rate /= 3;
 936                 }
 937                 else
 938                 {
 939                     /* MPEG-1 SCR is like PTS. */
 940                     byte_t      p_header[12];
 941                     byte_t *    p_byte;
 942                     p_byte = p_data->p_demux_start;
 943
 944                     if( MoveChunk( p_header, &p_data, &p_byte, 12 ) != 12 )
 945                     {
 946                         intf_WarnMsg( 1, "input: packet too short "
 947                                          "to have a header" );
 948                         b_trash = 1;
 949                         break;
 950                     }
 951                     scr_time =
 952                          ((mtime_t)(p_header[4] & 0x0E) << 29) |
 953                          (((mtime_t)U32_AT(p_header + 4) & 0xFFFE00) << 6) |
 954                          ((mtime_t)p_header[7] << 7) |
 955                          ((mtime_t)p_header[8] >> 1);
 956
 957                     /* mux_rate */
 958                     i_mux_rate = (U32_AT(p_header + 8) & 0x7FFFFE) >> 1;
 959                 }
 960                 /* Call the pace control. */
 961                 input_ClockManageRef( p_input,
 962                                       p_input->stream.p_selected_program,
 963                                       scr_time );
 964
 965                 if( i_mux_rate != p_input->stream.i_mux_rate
 966                      && p_input->stream.i_mux_rate )
 967                 {
 968                     intf_WarnMsg( 2, "input: mux_rate changed, "
 969                                      "expect cosmetic errors" );
 970                 }
 971                 p_input->stream.i_mux_rate = i_mux_rate;
 972
 973                 b_trash = 1;
 974             }
 975             break;
 976
 977         case 0x1BB: /* SYSTEM_START_CODE */
 978             b_trash = 1;                              /* Nothing interesting */
 979             break;
 980
 981         case 0x1BC: /* PROGRAM_STREAM_MAP_CODE */
 982             DecodePSM( p_input, p_data );
 983             b_trash = 1;
 984             break;
 985
 986         case 0x1B9: /* PROGRAM_END_CODE */
 987             b_trash = 1;
 988             break;
 989
 990         default:
 991             /* This should not happen */
 992             b_trash = 1;
 993             intf_WarnMsg( 3, "input: unwanted packet received "
 994                              "with start code 0x%.8x", i_code );
 995         }
 996     }
 997     else
 998     {
 999         p_es = input_ParsePS( p_input, p_data );
1000
1001         vlc_mutex_lock( &p_input->stream.control.control_lock );
1002         if( p_es != NULL && p_es->p_decoder_fifo != NULL
1003              && (!p_es->b_audio || !p_input->stream.control.b_mute) )
1004         {
1005             vlc_mutex_unlock( &p_input->stream.control.control_lock );
1006             p_es->c_packets++;
1007             input_GatherPES( p_input, p_data, p_es, 1, 0 );
1008         }
1009         else
1010         {
1011             vlc_mutex_unlock( &p_input->stream.control.control_lock );
1012             b_trash = 1;
1013         }
1014     }
1015
1016     /* Trash the packet if it has no payload or if it isn't selected */
1017     if( b_trash )
1018     {
1019         input_DeletePacket( p_input->p_method_data, p_data );
1020         p_input->stream.c_packets_trashed++;
1021     }
1022 }
1023
1024
1025 /*
1026  * TS Demultiplexing
1027  */
1028
1029 /*****************************************************************************
1030  * input_ReadTS: store a TS packet into a data_buffer_t
1031  *****************************************************************************/
1032 #define PEEK( SIZE )                                                        \
1033     i_error = input_Peek( p_input, &p_peek, SIZE );                         \
1034     if( i_error == -1 )                                                     \
1035     {                                                                       \
1036         return( -1 );                                                       \
1037     }                                                                       \
1038     else if( i_error < SIZE )                                               \
1039     {                                                                       \
1040         /* EOF */                                                           \
1041         return( 0 );                                                        \
1042     }
1043
1044 ssize_t input_ReadTS( input_thread_t * p_input, data_packet_t ** pp_data )
1045 {
1046     byte_t *            p_peek;
1047     ssize_t             i_error, i_read;
1048
1049     PEEK( 1 );
1050
1051     if( *p_peek != TS_SYNC_CODE )
1052     {
1053         intf_WarnMsg( 3, "input warning: garbage at input (%x)", *p_peek );
1054
1055         if( p_input->i_mtu )
1056         {
1057             while( *p_peek != TS_SYNC_CODE )
1058             {
1059                 /* Try to resync on next packet. */
1060                 PEEK( TS_PACKET_SIZE );
1061                 p_input->p_current_data += TS_PACKET_SIZE;
1062                 PEEK( 1 );
1063             }
1064         }
1065         else
1066         {
1067             /* Move forward until we find 0x47 (and hope it's the good
1068              * one... FIXME) */
1069             while( *p_peek != TS_SYNC_CODE )
1070             {
1071                 p_input->p_current_data++;
1072                 PEEK( 1 );
1073             }
1074         }
1075     }
1076
1077     i_read = input_SplitBuffer( p_input, pp_data, TS_PACKET_SIZE );
1078     if( i_read <= 0 )
1079     {
1080         return( i_read );
1081     }
1082
1083     return( 1 );
1084 }
1085
1086 /*****************************************************************************
1087  * input_DemuxTS: first step of demultiplexing: the TS header
1088  *****************************************************************************/
1089 void input_DemuxTS( input_thread_t * p_input, data_packet_t * p_data,
1090                         psi_callback_t pf_psi_callback )
1091 {
1092     u16                 i_pid;
1093     int                 i_dummy;
1094     boolean_t           b_adaptation;         /* Adaptation field is present */
1095     boolean_t           b_payload;                 /* Packet carries payload */
1096     boolean_t           b_unit_start;  /* A PSI or a PES start in the packet */
1097     boolean_t           b_trash = 0;             /* Is the packet unuseful ? */
1098     boolean_t           b_lost = 0;             /* Was there a packet loss ? */
1099     boolean_t           b_psi = 0;                        /* Is this a PSI ? */
1100     boolean_t           b_pcr = 0;                   /* Does it have a PCR ? */
1101     es_descriptor_t *   p_es = NULL;
1102     es_ts_data_t *      p_es_demux = NULL;
1103     pgrm_ts_data_t *    p_pgrm_demux = NULL;
1104
1105 #define p (p_data->p_demux_start)
1106     /* Extract flags values from TS common header. */
1107     i_pid = ((p[1] & 0x1F) << 8) | p[2];
1108     b_unit_start = (p[1] & 0x40);
1109     b_adaptation = (p[3] & 0x20);
1110     b_payload = (p[3] & 0x10);
1111
1112     /* Find out the elementary stream. */
1113     vlc_mutex_lock( &p_input->stream.stream_lock );
1114
1115     for( i_dummy = 0; i_dummy < p_input->stream.i_pgrm_number; i_dummy ++ )
1116     {
1117         if( (( pgrm_ts_data_t * ) p_input->stream.pp_programs[i_dummy]->
1118                     p_demux_data)->i_pcr_pid == i_pid )
1119         {
1120             b_pcr = 1;
1121             break;
1122         }
1123     }
1124
1125     p_es= input_FindES( p_input, i_pid );
1126
1127     if( (p_es != NULL) && (p_es->p_demux_data != NULL) )
1128     {
1129         p_es_demux = (es_ts_data_t *)p_es->p_demux_data;
1130
1131         if( p_es_demux->b_psi )
1132         {
1133             b_psi = 1;
1134         }
1135         else
1136         {
1137             p_pgrm_demux = (pgrm_ts_data_t *)p_es->p_pgrm->p_demux_data;
1138         }
1139     }
1140
1141     vlc_mutex_lock( &p_input->stream.control.control_lock );
1142     if( ( p_es == NULL ) || (p_es->b_audio && p_input->stream.control.b_mute) )
1143     {
1144         /* Not selected. Just read the adaptation field for a PCR. */
1145         b_trash = 1;
1146     }
1147     else if( p_es->p_decoder_fifo == NULL && !b_psi )
1148     {
1149         b_trash = 1;
1150     }
1151
1152     vlc_mutex_unlock( &p_input->stream.control.control_lock );
1153     vlc_mutex_unlock( &p_input->stream.stream_lock );
1154
1155
1156     /* Don't change the order of the tests : if b_psi then p_pgrm_demux
1157      * may still be null. Who said it was ugly ?
1158      * I have written worse. --Meuuh */
1159     if( ( p_es  ) &&
1160         ((p_es->p_decoder_fifo != NULL) || b_psi || b_pcr ) )
1161     {
1162         p_es->c_packets++;
1163
1164         /* Extract adaptation field information if any */
1165
1166         if( !b_adaptation )
1167         {
1168             /* We don't have any adaptation_field, so payload starts
1169              * immediately after the 4 byte TS header */
1170             p_data->p_payload_start += 4;
1171         }
1172         else
1173         {
1174             /* p[4] is adaptation_field_length minus one */
1175             p_data->p_payload_start += 5 + p[4];
1176
1177             /* The adaptation field can be limited to the
1178              * adaptation_field_length byte, so that there is nothing to do:
1179              * skip this possibility */
1180             if( p[4] )
1181             {
1182                 /* If the packet has both adaptation_field and payload,
1183                  * adaptation_field cannot be more than 182 bytes long; if
1184                  * there is only an adaptation_field, it must fill the next
1185                  * 183 bytes. */
1186                 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
1187                 {
1188                     intf_WarnMsg( 2,
1189                         "input: invalid TS adaptation field (%p)",
1190                         p_data );
1191                     p_data->b_discard_payload = 1;
1192                     p_es->c_invalid_packets++;
1193                 }
1194
1195                 /* Now we are sure that the byte containing flags is present:
1196                  * read it */
1197                 else
1198                 {
1199                     /* discontinuity_indicator */
1200                     if( p[5] & 0x80 )
1201                     {
1202                         intf_WarnMsg( 2,
1203                             "input: discontinuity_indicator"
1204                             " encountered by TS demux (position read: %d,"
1205                             " saved: %d)",
1206                             p[5] & 0x80, p_es_demux->i_continuity_counter );
1207
1208                         /* If the PID carries the PCR, there will be a system
1209                          * time-based discontinuity. We let the PCR decoder
1210                          * handle that. */
1211                         p_es->p_pgrm->i_synchro_state = SYNCHRO_REINIT;
1212
1213                         /* There also may be a continuity_counter
1214                          * discontinuity: resynchronize our counter with
1215                          * the one of the stream. */
1216                         p_es_demux->i_continuity_counter = (p[3] & 0x0f) - 1;
1217                     }
1218
1219                 } /* valid TS adaptation field ? */
1220             } /* length > 0 */
1221         } /* has adaptation field */
1222         /* Check the continuity of the stream. */
1223         i_dummy = ((p[3] & 0x0f) - p_es_demux->i_continuity_counter) & 0x0f;
1224         if( i_dummy == 1 )
1225         {
1226             /* Everything is ok, just increase our counter */
1227             (p_es_demux->i_continuity_counter)++;
1228         }
1229         else
1230         {
1231             if( !b_payload && i_dummy == 0 )
1232             {
1233                 /* This is a packet without payload, this is allowed by the
1234                  * draft. As there is nothing interesting in this packet
1235                  * (except PCR that have already been handled), we can trash
1236                  * the packet. */
1237                 intf_WarnMsg( 3, "input: packet without payload received "
1238                                  "by TS demux" );
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 }