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 1.87 2002/03/20 17:44:15 sam Exp $
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *          Michel Lespinasse <walken@via.ecp.fr>
   9  *          Benoît Steiner <benny@via.ecp.fr>
  10  *          Samuel Hocevar <sam@via.ecp.fr>
  11  *          Henri Fallon <henri@via.ecp.fr>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  26  *****************************************************************************/
  27
  28 /*****************************************************************************
  29  * Preamble
  30  *****************************************************************************/
  31 #include <stdlib.h>
  32 #include <string.h>                                    /* memcpy(), memset() */
  33 #include <sys/types.h>                                              /* off_t */
  34
  35 #include <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  * Local prototypes
  44  *****************************************************************************/
  45
  46 static void input_DecodePAT( input_thread_t *, es_descriptor_t *);
  47 static void input_DecodePMT( input_thread_t *, es_descriptor_t *);
  48
  49 /*
  50  * PES Packet management
  51  */
  52
  53 /*****************************************************************************
  54  * MoveChunk
  55  *****************************************************************************
  56  * Small utility function used to parse discontinuous headers safely. Copies
  57  * i_buf_len bytes of data to a buffer and returns the size copied.
  58  * It also solves some alignment problems on non-IA-32, non-PPC processors.
  59  * This is a variation on the theme of input_ext-dec.h:GetChunk().
  60  *****************************************************************************/
  61 static __inline__ size_t MoveChunk( byte_t * p_dest,
  62                                     data_packet_t ** pp_data_src,
  63                                     byte_t ** pp_src,
  64                                     size_t i_buf_len )
  65 {
  66     ptrdiff_t           i_available;
  67
  68     if( (i_available = (*pp_data_src)->p_payload_end - *pp_src)
  69             >= i_buf_len )
  70     {
  71         if( p_dest != NULL )
  72             memcpy( p_dest, *pp_src, i_buf_len );
  73         *pp_src += i_buf_len;
  74         return( i_buf_len );
  75     }
  76     else
  77     {
  78         size_t          i_init_len = i_buf_len;
  79
  80         do
  81         {
  82             if( p_dest != NULL )
  83                 memcpy( p_dest, *pp_src, i_available );
  84             *pp_data_src = (*pp_data_src)->p_next;
  85             i_buf_len -= i_available;
  86             p_dest += i_available;
  87             if( *pp_data_src == NULL )
  88             {
  89                 *pp_src = NULL;
  90                 return( i_init_len - i_buf_len );
  91             }
  92             *pp_src = (*pp_data_src)->p_payload_start;
  93         }
  94         while( (i_available = (*pp_data_src)->p_payload_end - *pp_src)
  95                 <= i_buf_len );
  96
  97         if( i_buf_len )
  98         {
  99             if( p_dest != NULL )
 100                 memcpy( p_dest, *pp_src, i_buf_len );
 101             *pp_src += i_buf_len;
 102         }
 103         return( i_init_len );
 104     }
 105 }
 106
 107 /*****************************************************************************
 108  * input_ParsePES
 109  *****************************************************************************
 110  * Parse a finished PES packet and analyze its header.
 111  *****************************************************************************/
 112 #define PES_HEADER_SIZE     7
 113 void input_ParsePES( input_thread_t * p_input, es_descriptor_t * p_es )
 114 {
 115     data_packet_t * p_data;
 116     byte_t *        p_byte;
 117     byte_t          p_header[PES_HEADER_SIZE];
 118     int             i_done;
 119
 120 #define p_pes (p_es->p_pes)
 121
 122     /* Parse the header. The header has a variable length, but in order
 123      * to improve the algorithm, we will read the 14 bytes we may be
 124      * interested in */
 125     p_data = p_pes->p_first;
 126     p_byte = p_data->p_payload_start;
 127     i_done = 0;
 128
 129     if( MoveChunk( p_header, &p_data, &p_byte, PES_HEADER_SIZE )
 130             != PES_HEADER_SIZE )
 131     {
 132         intf_WarnMsg( 1, "input: PES packet too short to have a header" );
 133         input_DeletePES( p_input->p_method_data, p_pes );
 134         p_pes = NULL;
 135         return;
 136     }
 137
 138     /* Get the PES size if defined */
 139     p_es->i_pes_real_size = U16_AT(p_header + 4);
 140     if( p_es->i_pes_real_size )
 141     {
 142         p_es->i_pes_real_size += 6;
 143     }
 144
 145     /* First read the 6 header bytes common to all PES packets:
 146      * use them to test the PES validity */
 147     if( (p_header[0] || p_header[1] || (p_header[2] != 1)) )
 148     {
 149         /* packet_start_code_prefix != 0x000001 */
 150         intf_ErrMsg( "input error: data loss, "
 151                      "PES packet doesn't start with 0x000001" );
 152         input_DeletePES( p_input->p_method_data, p_pes );
 153         p_pes = NULL;
 154     }
 155     else
 156     {
 157         int i_pes_header_size, i_payload_size;
 158
 159         if ( p_es->i_pes_real_size &&
 160              (p_es->i_pes_real_size != p_pes->i_pes_size) )
 161         {
 162             /* PES_packet_length is set and != total received payload */
 163             /* Warn the decoder that the data may be corrupt. */
 164             intf_WarnMsg( 1, "input: packet corrupted, "
 165                              "PES sizes do not match" );
 166         }
 167
 168         switch( p_es->i_stream_id )
 169         {
 170         case 0xBC:  /* Program stream map */
 171         case 0xBE:  /* Padding */
 172         case 0xBF:  /* Private stream 2 */
 173         case 0xB0:  /* ECM */
 174         case 0xB1:  /* EMM */
 175         case 0xFF:  /* Program stream directory */
 176         case 0xF2:  /* DSMCC stream */
 177         case 0xF8:  /* ITU-T H.222.1 type E stream */
 178             /* The payload begins immediately after the 6 bytes header, so
 179              * we have finished with the parsing */
 180             i_pes_header_size = 6;
 181             break;
 182
 183         default:
 184             if( (p_header[6] & 0xC0) == 0x80 )
 185             {
 186                 /* MPEG-2 : the PES header contains at least 3 more bytes. */
 187                 size_t      i_max_len;
 188                 boolean_t   b_has_pts, b_has_dts;
 189                 byte_t      p_full_header[12];
 190
 191                 p_pes->b_data_alignment = p_header[6] & 0x04;
 192
 193                 i_max_len = MoveChunk( p_full_header, &p_data, &p_byte, 12 );
 194                 if( i_max_len < 2 )
 195                 {
 196                     intf_WarnMsg( 1,
 197                             "PES packet too short to have a MPEG-2 header" );
 198                     input_DeletePES( p_input->p_method_data,
 199                                             p_pes );
 200                     p_pes = NULL;
 201                     return;
 202                 }
 203
 204                 b_has_pts = p_full_header[0] & 0x80;
 205                 b_has_dts = p_full_header[0] & 0x40;
 206                 i_pes_header_size = p_full_header[1] + 9;
 207
 208                 /* Now parse the optional header extensions */
 209                 if( b_has_pts )
 210                 {
 211                     if( i_max_len < 7 )
 212                     {
 213                         intf_WarnMsg( 1,
 214                             "PES packet too short to have a MPEG-2 header" );
 215                         input_DeletePES( p_input->p_method_data,
 216                                                 p_pes );
 217                         p_pes = NULL;
 218                         return;
 219                     }
 220                     p_pes->i_pts = input_ClockGetTS( p_input, p_es->p_pgrm,
 221                     ( ((mtime_t)(p_full_header[2] & 0x0E) << 29) |
 222                       ((mtime_t)(p_full_header[3]) << 22) |
 223                       ((mtime_t)(p_full_header[4] & 0xFE) << 14) |
 224                       ((mtime_t)p_full_header[5] << 7) |
 225                       ((mtime_t)p_full_header[6] >> 1) ) );
 226
 227                     if( b_has_dts )
 228                     {
 229                         if( i_max_len < 12 )
 230                         {
 231                             intf_WarnMsg( 1,
 232                               "PES packet too short to have a MPEG-2 header" );
 233                             input_DeletePES( p_input->p_method_data,
 234                                                     p_pes );
 235                             p_pes = NULL;
 236                             return;
 237                         }
 238                         p_pes->i_dts = input_ClockGetTS( p_input, p_es->p_pgrm,
 239                         ( ((mtime_t)(p_full_header[7] & 0x0E) << 29) |
 240                           (((mtime_t)U16_AT(p_full_header + 8) << 14)
 241                                 - (1 << 14)) |
 242                           ((mtime_t)U16_AT(p_full_header + 10) >> 1) ) );
 243                     }
 244                 }
 245             }
 246             else
 247             {
 248                 /* Probably MPEG-1 */
 249                 boolean_t       b_has_pts, b_has_dts;
 250
 251                 i_pes_header_size = 6;
 252                 p_data = p_pes->p_first;
 253                 p_byte = p_data->p_payload_start;
 254                 /* Cannot fail because the previous one succeeded. */
 255                 MoveChunk( NULL, &p_data, &p_byte, 6 );
 256
 257                 while( *p_byte == 0xFF && i_pes_header_size < 23 )
 258                 {
 259                     i_pes_header_size++;
 260                     if( MoveChunk( NULL, &p_data, &p_byte, 1 ) != 1 )
 261                     {
 262                         intf_WarnMsg( 1,
 263                             "PES packet too short to have a MPEG-1 header" );
 264                         input_DeletePES( p_input->p_method_data, p_pes );
 265                         p_pes = NULL;
 266                         return;
 267                     }
 268                 }
 269                 if( i_pes_header_size == 23 )
 270                 {
 271                     intf_ErrMsg( "input error: too much MPEG-1 stuffing" );
 272                     input_DeletePES( p_input->p_method_data, p_pes );
 273                     p_pes = NULL;
 274                     return;
 275                 }
 276
 277                 if( (*p_byte & 0xC0) == 0x40 )
 278                 {
 279                     /* Don't ask why... --Meuuh */
 280                     /* Erm... why ? --Sam */
 281                     /* Well... According to the recommendation, it is for
 282                      * STD_buffer_scale and STD_buffer_size. --Meuuh */
 283                     i_pes_header_size += 2;
 284                     if( MoveChunk( NULL, &p_data, &p_byte, 2 ) != 2 )
 285                     {
 286                         intf_WarnMsg( 1, "input: PES packet too short "
 287                                          "to have a MPEG-1 header" );
 288                         input_DeletePES( p_input->p_method_data, p_pes );
 289                         p_pes = NULL;
 290                         return;
 291                     }
 292                 }
 293
 294                 i_pes_header_size++;
 295
 296                 b_has_pts = *p_byte & 0x20;
 297                 b_has_dts = *p_byte & 0x10;
 298
 299                 if( b_has_pts )
 300                 {
 301                     byte_t      p_ts[5];
 302
 303                     i_pes_header_size += 4;
 304                     if( MoveChunk( p_ts, &p_data, &p_byte, 5 ) != 5 )
 305                     {
 306                         intf_WarnMsg( 1, "input: PES packet too short "
 307                                          "to have a MPEG-1 header" );
 308                         input_DeletePES( p_input->p_method_data, p_pes );
 309                         p_pes = NULL;
 310                         return;
 311                     }
 312
 313                     p_pes->i_pts = input_ClockGetTS( p_input, p_es->p_pgrm,
 314                        ( ((mtime_t)(p_ts[0] & 0x0E) << 29) |
 315                          (((mtime_t)U32_AT(p_ts) & 0xFFFE00) << 6) |
 316                          ((mtime_t)p_ts[3] << 7) |
 317                          ((mtime_t)p_ts[4] >> 1) ) );
 318
 319                     if( b_has_dts )
 320                     {
 321                         i_pes_header_size += 5;
 322                         if( MoveChunk( p_ts, &p_data, &p_byte, 5 ) != 5 )
 323                         {
 324                             intf_WarnMsg( 1, "input: PES packet too short "
 325                                              "to have a MPEG-1 header" );
 326                             input_DeletePES( p_input->p_method_data,
 327                                                     p_pes );
 328                             p_pes = NULL;
 329                             return;
 330                         }
 331
 332                         p_pes->i_dts = input_ClockGetTS( p_input,
 333                                                          p_es->p_pgrm,
 334                             ( ((mtime_t)(p_ts[0] & 0x0E) << 29) |
 335                               (((mtime_t)U32_AT(p_ts) & 0xFFFE00) << 6) |
 336                               ((mtime_t)p_ts[3] << 7) |
 337                               ((mtime_t)p_ts[4] >> 1) ) );
 338                     }
 339                 }
 340             }
 341
 342             break;
 343         }
 344
 345         if( p_es->i_stream_id == 0xbd )
 346         {
 347             /* With private stream 1, the first byte of the payload
 348              * is a stream_private_id, so skip it. */
 349             i_pes_header_size++;
 350         }
 351
 352         /* Now we've parsed the header, we just have to indicate in some
 353          * specific data packets where the PES payload begins (renumber
 354          * p_payload_start), so that the decoders can find the beginning
 355          * of their data right out of the box. */
 356         p_data = p_pes->p_first;
 357         i_payload_size = p_data->p_payload_end
 358                                  - p_data->p_payload_start;
 359         while( i_pes_header_size > i_payload_size )
 360         {
 361             /* These packets are entirely filled by the PES header. */
 362             i_pes_header_size -= i_payload_size;
 363             p_data->p_payload_start = p_data->p_payload_end;
 364             /* Go to the next data packet. */
 365             if( (p_data = p_data->p_next) == NULL )
 366             {
 367                 intf_ErrMsg( "input error: PES header bigger than payload" );
 368                 input_DeletePES( p_input->p_method_data, p_pes );
 369                 p_pes = NULL;
 370                 return;
 371             }
 372             i_payload_size = p_data->p_payload_end
 373                                  - p_data->p_payload_start;
 374         }
 375         /* This last packet is partly header, partly payload. */
 376         if( i_payload_size < i_pes_header_size )
 377         {
 378             intf_ErrMsg( "input error: PES header bigger than payload" );
 379             input_DeletePES( p_input->p_method_data, p_pes );
 380             p_pes = NULL;
 381             return;
 382         }
 383         p_data->p_payload_start += i_pes_header_size;
 384
 385         /* Now we can eventually put the PES packet in the decoder's
 386          * PES fifo */
 387         if( p_es->p_decoder_fifo != NULL )
 388         {
 389             input_DecodePES( p_es->p_decoder_fifo, p_pes );
 390         }
 391         else
 392         {
 393             intf_ErrMsg( "input error: no fifo to receive PES %p "
 394                          "(who wrote this damn code ?)", p_pes );
 395             input_DeletePES( p_input->p_method_data, p_pes );
 396         }
 397         p_pes = NULL;
 398     }
 399 #undef p_pes
 400
 401 }
 402
 403 /*****************************************************************************
 404  * input_GatherPES:
 405  *****************************************************************************
 406  * Gather a PES packet.
 407  *****************************************************************************/
 408 void input_GatherPES( input_thread_t * p_input, data_packet_t * p_data,
 409                       es_descriptor_t * p_es,
 410                       boolean_t b_unit_start, boolean_t b_packet_lost )
 411 {
 412 #define p_pes (p_es->p_pes)
 413
 414     /* If we lost data, insert a NULL data packet (philosophy : 0 is quite
 415      * often an escape sequence in decoders, so that should make them wait
 416      * for the next start code). */
 417     if( b_packet_lost )
 418     {
 419         input_NullPacket( p_input, p_es );
 420     }
 421
 422     if( b_unit_start && p_pes != NULL )
 423     {
 424         /* If the data packet contains the begining of a new PES packet, and
 425          * if we were reassembling a PES packet, then the PES should be
 426          * complete now, so parse its header and give it to the decoders. */
 427         input_ParsePES( p_input, p_es );
 428     }
 429
 430     if( !b_unit_start && p_pes == NULL )
 431     {
 432         /* Random access... */
 433         input_DeletePacket( p_input->p_method_data, p_data );
 434     }
 435     else
 436     {
 437         if( b_unit_start )
 438         {
 439             /* If we are at the beginning of a new PES packet, we must fetch
 440              * a new PES buffer to begin with the reassembly of this PES
 441              * packet. This is also here that we can synchronize with the
 442              * stream if we lost packets or if the decoder has just
 443              * started. */
 444             if( (p_pes = input_NewPES( p_input->p_method_data ) ) == NULL )
 445             {
 446                 intf_ErrMsg( "input error: out of memory" );
 447                 p_input->b_error = 1;
 448                 return;
 449             }
 450             p_pes->i_rate = p_input->stream.control.i_rate;
 451             p_pes->p_first = p_data;
 452
 453             /* If the PES header fits in the first data packet, we can
 454              * already set p_gather->i_pes_real_size. */
 455             if( p_data->p_payload_end - p_data->p_payload_start
 456                     >= PES_HEADER_SIZE )
 457             {
 458                 p_es->i_pes_real_size = ((u16)p_data->p_payload_start[4] << 8)
 459                                          + p_data->p_payload_start[5] + 6;
 460             }
 461             else
 462             {
 463                 p_es->i_pes_real_size = 0;
 464             }
 465         }
 466         else
 467         {
 468             /* Update the relations between the data packets */
 469             p_pes->p_last->p_next = p_data;
 470         }
 471
 472         p_pes->p_last = p_data;
 473         p_pes->i_nb_data++;
 474
 475         /* Size of the payload carried in the data packet */
 476         p_pes->i_pes_size += (p_data->p_payload_end
 477                                  - p_data->p_payload_start);
 478
 479         /* We can check if the packet is finished */
 480         if( p_pes->i_pes_size == p_es->i_pes_real_size )
 481         {
 482             /* The packet is finished, parse it */
 483             input_ParsePES( p_input, p_es );
 484         }
 485     }
 486 #undef p_pes
 487 }
 488
 489
 490 /*
 491  * PS Demultiplexing
 492  */
 493
 494 /*****************************************************************************
 495  * GetID: Get the ID of a stream
 496  *****************************************************************************/
 497 static u16 GetID( data_packet_t * p_data )
 498 {
 499     u16         i_id;
 500
 501     i_id = p_data->p_demux_start[3];                            /* stream_id */
 502     if( i_id == 0xBD )
 503     {
 504         /* FIXME : this is not valid if the header is split in multiple
 505          * packets */
 506         /* stream_private_id */
 507         i_id |= p_data->p_demux_start[ 9 + p_data->p_demux_start[8] ] << 8;
 508     }
 509     return( i_id );
 510 }
 511
 512 /*****************************************************************************
 513  * DecodePSM: Decode the Program Stream Map information
 514  *****************************************************************************
 515  * FIXME : loads are not aligned in this function
 516  *****************************************************************************/
 517 static void DecodePSM( input_thread_t * p_input, data_packet_t * p_data )
 518 {
 519     stream_ps_data_t *  p_demux =
 520                  (stream_ps_data_t *)p_input->stream.p_demux_data;
 521     byte_t *            p_byte;
 522     byte_t *            p_end;
 523     int                 i;
 524     int                 i_new_es_number = 0;
 525
 526     if( p_data->p_demux_start + 10 > p_data->p_payload_end )
 527     {
 528         intf_ErrMsg( "input error: PSM too short : packet corrupt" );
 529         return;
 530     }
 531
 532     if( p_demux->b_has_PSM
 533         && p_demux->i_PSM_version == (p_data->p_demux_start[6] & 0x1F) )
 534     {
 535         /* Already got that one. */
 536         return;
 537     }
 538
 539     p_demux->b_has_PSM = 1;
 540     p_demux->i_PSM_version = p_data->p_demux_start[6] & 0x1F;
 541
 542     /* Go to elementary_stream_map_length, jumping over
 543      * program_stream_info. */
 544     p_byte = p_data->p_demux_start + 10
 545               + U16_AT(&p_data->p_demux_start[8]);
 546     if( p_byte > p_data->p_payload_end )
 547     {
 548         intf_ErrMsg( "input error: PSM too short, packet corrupt" );
 549         return;
 550     }
 551     /* This is the full size of the elementary_stream_map.
 552      * 2 == elementary_stream_map_length
 553      * Please note that CRC_32 is not included in the length. */
 554     p_end = p_byte + 2 + U16_AT(p_byte);
 555     p_byte += 2;
 556     if( p_end > p_data->p_payload_end )
 557     {
 558         intf_ErrMsg( "input error: PSM too short, packet corrupt" );
 559         return;
 560     }
 561
 562     vlc_mutex_lock( &p_input->stream.stream_lock );
 563
 564     /* 4 == minimum useful size of a section */
 565     while( p_byte + 4 <= p_end )
 566     {
 567         es_descriptor_t *   p_es = NULL;
 568         u8                  i_stream_id = p_byte[1];
 569         /* FIXME: there will be a problem with private streams... (same
 570          * stream_id) */
 571
 572         /* Look for the ES in the ES table */
 573         for( i = i_new_es_number;
 574              i < p_input->stream.pp_programs[0]->i_es_number;
 575              i++ )
 576         {
 577             if( p_input->stream.pp_programs[0]->pp_es[i]->i_stream_id
 578                     == i_stream_id )
 579             {
 580                 p_es = p_input->stream.pp_programs[0]->pp_es[i];
 581                 if( p_es->i_type != p_byte[0] )
 582                 {
 583                     input_DelES( p_input, p_es );
 584                     p_es = NULL;
 585                 }
 586                 else
 587                 {
 588                     /* Move the ES to the beginning. */
 589                     p_input->stream.pp_programs[0]->pp_es[i]
 590                         = p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ];
 591                     p_input->stream.pp_programs[0]->pp_es[ i_new_es_number ]
 592                         = p_es;
 593                     i_new_es_number++;
 594                 }
 595                 break;
 596             }
 597         }
 598
 599         /* The goal is to have all the ES we have just read in the
 600          * beginning of the pp_es table, and all the others at the end,
 601          * so that we can close them more easily at the end. */
 602         if( p_es == NULL )
 603         {
 604             p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
 605                                 i_stream_id, 0 );
 606             p_es->i_type = p_byte[0];
 607             p_es->b_audio = ( p_es->i_type == MPEG1_AUDIO_ES
 608                               || p_es->i_type == MPEG2_AUDIO_ES
 609                               || p_es->i_type == AC3_AUDIO_ES
 610                               || p_es->i_type == LPCM_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 || *(p_peek + 1) || *(p_peek + 2) != 1 )
 666     {
 667         if( *p_peek || *(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, *(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 || *(p_peek + 1) || *(p_peek + 2) != 1 )
 679         {
 680             p_input->p_current_data++;
 681             PEEK( 4 );
 682         }
 683         /* Packet found. */
 684     }
 685
 686     /* 0x1B9 == SYSTEM_END_CODE, it is only 4 bytes long. */
 687     if( p_peek[3] != 0xB9 )
 688     {
 689         /* The packet is at least 6 bytes long. */
 690         PEEK( 6 );
 691
 692         if( p_peek[3] != 0xBA )
 693         {
 694             /* That's the case for all packets, except pack header. */
 695             i_packet_size = (p_peek[4] << 8) | p_peek[5];
 696         }
 697         else
 698         {
 699             /* Pack header. */
 700             if( (p_peek[4] & 0xC0) == 0x40 )
 701             {
 702                 /* MPEG-2 */
 703                 i_packet_size = 8;
 704             }
 705             else if( (p_peek[4] & 0xF0) == 0x20 )
 706             {
 707                 /* MPEG-1 */
 708                 i_packet_size = 6;
 709             }
 710             else
 711             {
 712                 intf_ErrMsg( "Unable to determine stream type" );
 713                 return( -1 );
 714             }
 715         }
 716     }
 717     else
 718     {
 719         /* System End Code */
 720         i_packet_size = -2;
 721     }
 722
 723     /* Fetch a packet of the appropriate size. */
 724     i_read = input_SplitBuffer( p_input, pp_data, i_packet_size + 6 );
 725     if( i_read <= 0 )
 726     {
 727         return( i_read );
 728     }
 729
 730     /* In MPEG-2 pack headers we still have to read stuffing bytes. */
 731     if( ((*pp_data)->p_demux_start[3] == 0xBA) && (i_packet_size == 8) )
 732     {
 733         size_t i_stuffing = ((*pp_data)->p_demux_start[13] & 0x7);
 734         /* Force refill of the input buffer - though we don't care
 735          * about p_peek. Please note that this is unoptimized. */
 736         PEEK( i_stuffing );
 737         p_input->p_current_data += i_stuffing;
 738     }
 739
 740     return( 1 );
 741 }
 742
 743 #undef PEEK
 744
 745 /*****************************************************************************
 746  * input_ParsePS: read the PS header
 747  *****************************************************************************/
 748 es_descriptor_t * input_ParsePS( input_thread_t * p_input,
 749                                  data_packet_t * p_data )
 750 {
 751     u32                 i_code;
 752     es_descriptor_t *   p_es = NULL;
 753
 754     i_code = p_data->p_demux_start[3];
 755
 756     if( i_code > 0xBC ) /* ES start code */
 757     {
 758         u16                 i_id;
 759         int                 i_dummy;
 760
 761         /* This is a PES packet. Find out if we want it or not. */
 762         i_id = GetID( p_data );
 763
 764         vlc_mutex_lock( &p_input->stream.stream_lock );
 765         if( p_input->stream.pp_programs[0]->b_is_ok )
 766         {
 767             /* Look only at the selected ES. */
 768             for( i_dummy = 0; i_dummy < p_input->stream.i_selected_es_number;
 769                  i_dummy++ )
 770             {
 771                 if( p_input->stream.pp_selected_es[i_dummy] != NULL
 772                     && p_input->stream.pp_selected_es[i_dummy]->i_id == i_id )
 773                 {
 774                     p_es = p_input->stream.pp_selected_es[i_dummy];
 775                     break;
 776                 }
 777             }
 778         }
 779         else
 780         {
 781             stream_ps_data_t * p_demux =
 782               (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
 783
 784             /* Search all ES ; if not found -> AddES */
 785             p_es = input_FindES( p_input, i_id );
 786
 787             if( p_es == NULL && !p_demux->b_has_PSM )
 788             {
 789                 p_es = input_AddES( p_input, p_input->stream.pp_programs[0],
 790                                     i_id, 0 );
 791                 if( p_es != NULL )
 792                 {
 793                     p_es->i_stream_id = p_data->p_demux_start[3];
 794
 795                     /* Set stream type and auto-spawn. */
 796                     if( (i_id & 0xF0) == 0xE0 )
 797                     {
 798                         /* MPEG video */
 799                         p_es->i_type = MPEG2_VIDEO_ES;
 800                         p_es->i_cat = VIDEO_ES;
 801 #ifdef AUTO_SPAWN
 802                         if( !p_input->stream.b_seekable )
 803                             input_SelectES( p_input, p_es );
 804 #endif
 805                     }
 806                     else if( (i_id & 0xE0) == 0xC0 )
 807                     {
 808                         /* MPEG audio */
 809                         p_es->i_type = MPEG2_AUDIO_ES;
 810                         p_es->b_audio = 1;
 811                         p_es->i_cat = AUDIO_ES;
 812 #ifdef AUTO_SPAWN
 813                         if( !p_input->stream.b_seekable )
 814                         if( config_GetIntVariable( "input_channel" )
 815                                 == (p_es->i_id & 0x1F) ||
 816                             ( config_GetIntVariable( "input_channel" ) < 0
 817                               && !(p_es->i_id & 0x1F) ) )
 818                         switch( config_GetIntVariable( "input_audio" ) )
 819                         {
 820                         case -1:
 821                         case REQUESTED_MPEG:
 822                             input_SelectES( p_input, p_es );
 823                         }
 824 #endif
 825                     }
 826                     else if( (i_id & 0xF0FF) == 0x80BD )
 827                     {
 828                         /* AC3 audio (0x80->0x8F) */
 829                         p_es->i_type = AC3_AUDIO_ES;
 830                         p_es->b_audio = 1;
 831                         p_es->i_cat = AUDIO_ES;
 832 #ifdef AUTO_SPAWN
 833                         if( !p_input->stream.b_seekable )
 834                         if( config_GetIntVariable( "input_channel" )
 835                                 == ((p_es->i_id & 0xF00) >> 8) ||
 836                             ( config_GetIntVariable( "input_channel" ) < 0
 837                               && !((p_es->i_id & 0xF00) >> 8)) )
 838                         switch( config_GetIntVariable( "input_audio" ) )
 839                         {
 840                         case -1:
 841                         case REQUESTED_AC3:
 842                             input_SelectES( p_input, p_es );
 843                         }
 844 #endif
 845                     }
 846                     else if( (i_id & 0xE0FF) == 0x20BD )
 847                     {
 848                         /* Subtitles video (0x20->0x3F) */
 849                         p_es->i_type = DVD_SPU_ES;
 850                         p_es->i_cat = SPU_ES;
 851 #ifdef AUTO_SPAWN
 852                         if( config_GetIntVariable( "input_subtitle" )
 853                                 == ((p_es->i_id & 0x1F00) >> 8) )
 854                         {
 855                             if( !p_input->stream.b_seekable )
 856                                 input_SelectES( p_input, p_es );
 857                         }
 858 #endif
 859                     }
 860                     else if( (i_id & 0xF0FF) == 0xA0BD )
 861                     {
 862                         /* LPCM audio (0xA0->0xAF) */
 863                         p_es->i_type = LPCM_AUDIO_ES;
 864                         p_es->b_audio = 1;
 865                         p_es->i_cat = AUDIO_ES;
 866                     }
 867                     else
 868                     {
 869                         p_es->i_type = UNKNOWN_ES;
 870                     }
 871                 }
 872
 873                 /* Tell the interface the stream has changed */
 874                 p_input->stream.b_changed = 1;
 875             }
 876         } /* stream.b_is_ok */
 877         vlc_mutex_unlock( &p_input->stream.stream_lock );
 878     } /* i_code > 0xBC */
 879
 880     return( p_es );
 881 }
 882
 883 /*****************************************************************************
 884  * input_DemuxPS: first step of demultiplexing: the PS header
 885  *****************************************************************************/
 886 void input_DemuxPS( input_thread_t * p_input, data_packet_t * p_data )
 887 {
 888     u32                 i_code;
 889     boolean_t           b_trash = 0;
 890     es_descriptor_t *   p_es = NULL;
 891
 892     i_code = ((u32)p_data->p_demux_start[0] << 24)
 893                 | ((u32)p_data->p_demux_start[1] << 16)
 894                 | ((u32)p_data->p_demux_start[2] << 8)
 895                 | p_data->p_demux_start[3];
 896     if( i_code <= 0x1BC )
 897     {
 898         switch( i_code )
 899         {
 900         case 0x1BA: /* PACK_START_CODE */
 901             {
 902                 /* Read the SCR. */
 903                 mtime_t         scr_time;
 904                 u32             i_mux_rate;
 905
 906                 if( (p_data->p_demux_start[4] & 0xC0) == 0x40 )
 907                 {
 908                     /* MPEG-2 */
 909                     byte_t      p_header[14];
 910                     byte_t *    p_byte;
 911                     p_byte = p_data->p_demux_start;
 912
 913                     if( MoveChunk( p_header, &p_data, &p_byte, 14 ) != 14 )
 914                     {
 915                         intf_WarnMsg( 1, "input: packet too short "
 916                                          "to have a header" );
 917                         b_trash = 1;
 918                         break;
 919                     }
 920                     scr_time =
 921                          ((mtime_t)(p_header[4] & 0x38) << 27) |
 922                          ((mtime_t)(U32_AT(p_header + 4) & 0x03FFF800)
 923                                         << 4) |
 924                          ((( ((mtime_t)U16_AT(p_header + 6) << 16)
 925                             | (mtime_t)U16_AT(p_header + 8) ) & 0x03FFF800)
 926                                         >> 11);
 927
 928                     /* mux_rate */
 929                     i_mux_rate = ((u32)U16_AT(p_header + 10) << 6)
 930                                    | (p_header[12] >> 2);
 931                     /* FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
 932                      * This is the biggest kludge ever !
 933                      * I don't know what's wrong with mux_rate calculation
 934                      * but this heuristic work well : */
 935                     i_mux_rate <<= 1;
 936                     i_mux_rate /= 3;
 937                 }
 938                 else
 939                 {
 940                     /* MPEG-1 SCR is like PTS. */
 941                     byte_t      p_header[12];
 942                     byte_t *    p_byte;
 943                     p_byte = p_data->p_demux_start;
 944
 945                     if( MoveChunk( p_header, &p_data, &p_byte, 12 ) != 12 )
 946                     {
 947                         intf_WarnMsg( 1, "input: packet too short "
 948                                          "to have a header" );
 949                         b_trash = 1;
 950                         break;
 951                     }
 952                     scr_time =
 953                          ((mtime_t)(p_header[4] & 0x0E) << 29) |
 954                          (((mtime_t)U32_AT(p_header + 4) & 0xFFFE00) << 6) |
 955                          ((mtime_t)p_header[7] << 7) |
 956                          ((mtime_t)p_header[8] >> 1);
 957
 958                     /* mux_rate */
 959                     i_mux_rate = (U32_AT(p_header + 8) & 0x7FFFFE) >> 1;
 960                 }
 961                 /* Call the pace control. */
 962                 input_ClockManageRef( p_input,
 963                                       p_input->stream.p_selected_program,
 964                                       scr_time );
 965
 966                 if( i_mux_rate != p_input->stream.i_mux_rate
 967                      && p_input->stream.i_mux_rate )
 968                 {
 969                     intf_WarnMsg( 2, "input: mux_rate changed, "
 970                                      "expect cosmetic errors" );
 971                 }
 972                 p_input->stream.i_mux_rate = i_mux_rate;
 973
 974                 b_trash = 1;
 975             }
 976             break;
 977
 978         case 0x1BB: /* SYSTEM_START_CODE */
 979             b_trash = 1;                              /* Nothing interesting */
 980             break;
 981
 982         case 0x1BC: /* PROGRAM_STREAM_MAP_CODE */
 983             DecodePSM( p_input, p_data );
 984             b_trash = 1;
 985             break;
 986
 987         case 0x1B9: /* PROGRAM_END_CODE */
 988             b_trash = 1;
 989             break;
 990
 991         default:
 992             /* This should not happen */
 993             b_trash = 1;
 994             intf_WarnMsg( 3, "input: unwanted packet received "
 995                              "with start code 0x%.8x", i_code );
 996         }
 997     }
 998     else
 999     {
1000         p_es = input_ParsePS( p_input, p_data );
1001
1002         vlc_mutex_lock( &p_input->stream.control.control_lock );
1003         if( p_es != NULL && p_es->p_decoder_fifo != NULL
1004              && (!p_es->b_audio || !p_input->stream.control.b_mute) )
1005         {
1006             vlc_mutex_unlock( &p_input->stream.control.control_lock );
1007             p_es->c_packets++;
1008             input_GatherPES( p_input, p_data, p_es, 1, 0 );
1009         }
1010         else
1011         {
1012             vlc_mutex_unlock( &p_input->stream.control.control_lock );
1013             b_trash = 1;
1014         }
1015     }
1016
1017     /* Trash the packet if it has no payload or if it isn't selected */
1018     if( b_trash )
1019     {
1020         input_DeletePacket( p_input->p_method_data, p_data );
1021         p_input->stream.c_packets_trashed++;
1022     }
1023 }
1024
1025
1026 /*
1027  * TS Demultiplexing
1028  */
1029
1030 /*****************************************************************************
1031  * input_ReadTS: store a TS packet into a data_buffer_t
1032  *****************************************************************************/
1033 #define PEEK( SIZE )                                                        \
1034     i_error = input_Peek( p_input, &p_peek, SIZE );                         \
1035     if( i_error == -1 )                                                     \
1036     {                                                                       \
1037         return( -1 );                                                       \
1038     }                                                                       \
1039     else if( i_error < SIZE )                                               \
1040     {                                                                       \
1041         /* EOF */                                                           \
1042         return( 0 );                                                        \
1043     }
1044
1045 ssize_t input_ReadTS( input_thread_t * p_input, data_packet_t ** pp_data )
1046 {
1047     byte_t *            p_peek;
1048     ssize_t             i_error, i_read;
1049
1050     PEEK( 1 );
1051
1052     if( *p_peek != TS_SYNC_CODE )
1053     {
1054         intf_WarnMsg( 3, "input warning: garbage at input (%x)", *p_peek );
1055
1056         if( p_input->i_mtu )
1057         {
1058             while( *p_peek != TS_SYNC_CODE )
1059             {
1060                 /* Try to resync on next packet. */
1061                 PEEK( TS_PACKET_SIZE );
1062                 p_input->p_current_data += TS_PACKET_SIZE;
1063                 PEEK( 1 );
1064             }
1065         }
1066         else
1067         {
1068             /* Move forward until we find 0x47 (and hope it's the good
1069              * one... FIXME) */
1070             while( *p_peek != TS_SYNC_CODE )
1071             {
1072                 p_input->p_current_data++;
1073                 PEEK( 1 );
1074             }
1075         }
1076     }
1077
1078     i_read = input_SplitBuffer( p_input, pp_data, TS_PACKET_SIZE );
1079     if( i_read <= 0 )
1080     {
1081         return( i_read );
1082     }
1083
1084     return( 1 );
1085 }
1086
1087 /*****************************************************************************
1088  * input_DemuxTS: first step of demultiplexing: the TS header
1089  *****************************************************************************/
1090 void input_DemuxTS( input_thread_t * p_input, data_packet_t * p_data )
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     es_descriptor_t *   p_es = NULL;
1101     es_ts_data_t *      p_es_demux = NULL;
1102     pgrm_ts_data_t *    p_pgrm_demux = NULL;
1103
1104 #define p (p_data->p_demux_start)
1105     /* Extract flags values from TS common header. */
1106     i_pid = ((p[1] & 0x1F) << 8) | p[2];
1107     b_unit_start = (p[1] & 0x40);
1108     b_adaptation = (p[3] & 0x20);
1109     b_payload = (p[3] & 0x10);
1110
1111     /* Find out the elementary stream. */
1112     vlc_mutex_lock( &p_input->stream.stream_lock );
1113
1114     p_es= input_FindES( p_input, i_pid );
1115
1116     if( (p_es != NULL) && (p_es->p_demux_data != NULL) )
1117     {
1118         p_es_demux = (es_ts_data_t *)p_es->p_demux_data;
1119
1120         if( p_es_demux->b_psi )
1121         {
1122             b_psi = 1;
1123         }
1124         else
1125         {
1126             p_pgrm_demux = (pgrm_ts_data_t *)p_es->p_pgrm->p_demux_data;
1127         }
1128     }
1129
1130     vlc_mutex_lock( &p_input->stream.control.control_lock );
1131     if( ( p_es == NULL ) || (p_es->b_audio && p_input->stream.control.b_mute) )
1132     {
1133         /* Not selected. Just read the adaptation field for a PCR. */
1134         b_trash = 1;
1135     }
1136     else if( p_es->p_decoder_fifo == NULL && !b_psi )
1137     {
1138         b_trash = 1;
1139     }
1140
1141     vlc_mutex_unlock( &p_input->stream.control.control_lock );
1142     vlc_mutex_unlock( &p_input->stream.stream_lock );
1143
1144
1145     /* Don't change the order of the tests : if b_psi then p_pgrm_demux
1146      * may still be null. Who said it was ugly ?
1147      * I have written worse. --Meuuh */
1148     if( ( p_es != NULL ) &&
1149         ((p_es->p_decoder_fifo != NULL) || b_psi
1150                                    || (p_pgrm_demux->i_pcr_pid == i_pid) ) )
1151     {
1152         p_es->c_packets++;
1153
1154         /* Extract adaptation field information if any */
1155
1156         if( !b_adaptation )
1157         {
1158             /* We don't have any adaptation_field, so payload starts
1159              * immediately after the 4 byte TS header */
1160             p_data->p_payload_start += 4;
1161         }
1162         else
1163         {
1164             /* p[4] is adaptation_field_length minus one */
1165             p_data->p_payload_start += 5 + p[4];
1166
1167             /* The adaptation field can be limited to the
1168              * adaptation_field_length byte, so that there is nothing to do:
1169              * skip this possibility */
1170             if( p[4] )
1171             {
1172                 /* If the packet has both adaptation_field and payload,
1173                  * adaptation_field cannot be more than 182 bytes long; if
1174                  * there is only an adaptation_field, it must fill the next
1175                  * 183 bytes. */
1176                 if( b_payload ? (p[4] > 182) : (p[4] != 183) )
1177                 {
1178                     intf_WarnMsg( 2,
1179                         "input: invalid TS adaptation field (%p)",
1180                         p_data );
1181                     p_data->b_discard_payload = 1;
1182                     p_es->c_invalid_packets++;
1183                 }
1184
1185                 /* Now we are sure that the byte containing flags is present:
1186                  * read it */
1187                 else
1188                 {
1189                     /* discontinuity_indicator */
1190                     if( p[5] & 0x80 )
1191                     {
1192                         intf_WarnMsg( 2,
1193                             "input: discontinuity_indicator"
1194                             " encountered by TS demux (position read: %d,"
1195                             " saved: %d)",
1196                             p[5] & 0x80, p_es_demux->i_continuity_counter );
1197
1198                         /* If the PID carries the PCR, there will be a system
1199                          * time-based discontinuity. We let the PCR decoder
1200                          * handle that. */
1201                         p_es->p_pgrm->i_synchro_state = SYNCHRO_REINIT;
1202
1203                         /* There also may be a continuity_counter
1204                          * discontinuity: resynchronize our counter with
1205                          * the one of the stream. */
1206                         p_es_demux->i_continuity_counter = (p[3] & 0x0f) - 1;
1207                     }
1208
1209                     /* If this is a PCR_PID, and this TS packet contains a
1210                      * PCR, we pass it along to the PCR decoder. */
1211
1212                     if( !b_psi && (p_pgrm_demux->i_pcr_pid == i_pid)
1213                         && (p[5] & 0x10) )
1214                     {
1215                         /* There should be a PCR field in the packet, check
1216                          * if the adaptation field is long enough to carry
1217                          * it. */
1218                         if( p[4] >= 7 )
1219                         {
1220                             /* Read the PCR. */
1221                             mtime_t     pcr_time;
1222                             pcr_time = ( (mtime_t)p[6] << 25 ) |
1223                                        ( (mtime_t)p[7] << 17 ) |
1224                                        ( (mtime_t)p[8] << 9 ) |
1225                                        ( (mtime_t)p[9] << 1 ) |
1226                                        ( (mtime_t)p[10] >> 7 );
1227                             /* Call the pace control. */
1228                             input_ClockManageRef( p_input, p_es->p_pgrm,
1229                                                   pcr_time );
1230                         }
1231                     } /* PCR ? */
1232                 } /* valid TS adaptation field ? */
1233             } /* length > 0 */
1234         } /* has adaptation field */
1235         /* Check the continuity of the stream. */
1236         i_dummy = ((p[3] & 0x0f) - p_es_demux->i_continuity_counter) & 0x0f;
1237         if( i_dummy == 1 )
1238         {
1239             /* Everything is ok, just increase our counter */
1240             (p_es_demux->i_continuity_counter)++;
1241         }
1242         else
1243         {
1244             if( !b_payload && i_dummy == 0 )
1245             {
1246                 /* This is a packet without payload, this is allowed by the
1247                  * draft. As there is nothing interesting in this packet
1248                  * (except PCR that have already been handled), we can trash
1249                  * the packet. */
1250                 intf_WarnMsg( 3, "input: packet without payload received "
1251                                  "by TS demux" );
1252                 b_trash = 1;
1253             }
1254             else if( i_dummy <= 0 )
1255             {
1256                 /* Duplicate packet: mark it as being to be trashed. */
1257                 intf_WarnMsg( 3, "input: duplicate packet received "
1258                                  "by TS demux" );
1259                 b_trash = 1;
1260             }
1261             else if( p_es_demux->i_continuity_counter == 0xFF )
1262             {
1263                 /* This means that the packet is the first one we receive for
1264                  * this ES since the continuity counter ranges between 0 and
1265                  * 0x0F excepts when it has been initialized by the input:
1266                  * init the counter to the correct value. */
1267                 intf_WarnMsg( 3, "input: first packet for PID %d received "
1268                              "by TS demux", p_es->i_id );
1269                 p_es_demux->i_continuity_counter = (p[3] & 0x0f);
1270             }
1271             else
1272             {
1273                 /* This can indicate that we missed a packet or that the
1274                  * continuity_counter wrapped and we received a dup packet:
1275                  * as we don't know, do as if we missed a packet to be sure
1276                  * to recover from this situation */
1277                 intf_WarnMsg( 2, "input: packet lost by TS demux: "
1278                                  "current %d, packet %d",
1279                               p_es_demux->i_continuity_counter & 0x0f,
1280                               p[3] & 0x0f );
1281                 b_lost = 1;
1282                 p_es_demux->i_continuity_counter = p[3] & 0x0f;
1283             } /* not continuous */
1284         } /* continuity */
1285     } /* if selected or PCR */
1286
1287     /* Trash the packet if it has no payload or if it isn't selected */
1288     if( b_trash )
1289     {
1290         input_DeletePacket( p_input->p_method_data, p_data );
1291         p_input->stream.c_packets_trashed++;
1292     }
1293     else
1294     {
1295         if( b_psi )
1296         {
1297             /* The payload contains PSI tables */
1298             input_DemuxPSI( p_input, p_data, p_es,
1299                             b_unit_start, b_lost );
1300
1301         }
1302         else
1303         {
1304             /* The payload carries a PES stream */
1305             input_GatherPES( p_input, p_data, p_es, b_unit_start, b_lost );
1306         }
1307
1308     }
1309
1310 #undef p
1311
1312 }
1313
1314 /*
1315  * PSI demultiplexing and decoding
1316  */
1317
1318 /*****************************************************************************
1319  * DemuxPSI : makes up complete PSI data
1320  *****************************************************************************/
1321 void input_DemuxPSI( input_thread_t * p_input, data_packet_t * p_data,
1322         es_descriptor_t * p_es, boolean_t b_unit_start, boolean_t b_lost )
1323 {
1324     es_ts_data_t  * p_demux_data;
1325
1326     p_demux_data = (es_ts_data_t *)p_es->p_demux_data;
1327
1328 #define p_psi (p_demux_data->p_psi_section)
1329 #define p (p_data->p_payload_start)
1330
1331     if( b_unit_start )
1332     {
1333         /* unit_start set to 1 -> presence of a pointer field
1334          * (see ISO/IEC 13818 (2.4.4.2) which should be set to 0x00 */
1335         if( (u8)p[0] != 0x00 )
1336         {
1337             intf_WarnMsg( 2, "input: non zero pointer field found, "
1338                              "trying to continue" );
1339             p+=(u8)p[0];
1340         }
1341         else
1342         {
1343             p++;
1344         }
1345
1346         /* This is the begining of a new section */
1347
1348         if( ((u8)(p[1]) & 0xc0) != 0x80 )
1349         {
1350             intf_WarnMsg( 2, "input: invalid PSI packet" );
1351             p_psi->b_trash = 1;
1352         }
1353         else
1354         {
1355             p_psi->i_section_length = ((p[1] & 0xF) << 8) | p[2];
1356             p_psi->b_section_complete = 0;
1357             p_psi->i_read_in_section = 0;
1358             p_psi->i_section_number = (u8)p[6];
1359
1360             if( p_psi->b_is_complete || p_psi->i_section_number == 0 )
1361             {
1362                 /* This is a new PSI packet */
1363                 p_psi->b_is_complete = 0;
1364                 p_psi->b_trash = 0;
1365                 p_psi->i_version_number = ( p[5] >> 1 ) & 0x1f;
1366                 p_psi->i_last_section_number = (u8)p[7];
1367
1368                 /* We'll write at the begining of the buffer */
1369                 p_psi->p_current = p_psi->buffer;
1370             }
1371             else
1372             {
1373                 if( p_psi->b_section_complete )
1374                 {
1375                     /* New Section of an already started PSI */
1376                     p_psi->b_section_complete = 0;
1377
1378                     if( p_psi->i_version_number != (( p[5] >> 1 ) & 0x1f) )
1379                     {
1380                         intf_WarnMsg( 2, "input: PSI version differs "
1381                                          "inside same PAT" );
1382                         p_psi->b_trash = 1;
1383                     }
1384                     if( p_psi->i_section_number + 1 != (u8)p[6] )
1385                     {
1386                         intf_WarnMsg( 2, "input: PSI Section discontinuity, "
1387                                          "packet lost ?" );
1388                         p_psi->b_trash = 1;
1389                     }
1390                     else
1391                         p_psi->i_section_number++;
1392                 }
1393                 else
1394                 {
1395                     intf_WarnMsg( 2, "input: got unexpected new PSI section" );
1396                     p_psi->b_trash = 1;
1397                 }
1398             }
1399         }
1400     } /* b_unit_start */
1401
1402     if( !p_psi->b_trash )
1403     {
1404         /* read */
1405         if( (p_data->p_payload_end - p) >=
1406             ( p_psi->i_section_length - p_psi->i_read_in_section ) )
1407         {
1408             /* The end of the section is in this TS packet */
1409             memcpy( p_psi->p_current, p,
1410             (p_psi->i_section_length - p_psi->i_read_in_section) );
1411
1412             p_psi->b_section_complete = 1;
1413             p_psi->p_current +=
1414                 (p_psi->i_section_length - p_psi->i_read_in_section);
1415
1416             if( p_psi->i_section_number == p_psi->i_last_section_number )
1417             {
1418                 /* This was the last section of PSI */
1419                 p_psi->b_is_complete = 1;
1420
1421                 switch( p_demux_data->i_psi_type)
1422                 {
1423                 case PSI_IS_PAT:
1424                     input_DecodePAT( p_input, p_es );
1425                     break;
1426                 case PSI_IS_PMT:
1427                     input_DecodePMT( p_input, p_es );
1428                     break;
1429                 default:
1430                     intf_WarnMsg(2, "Received unknown PSI in DemuxPSI");
1431                 }
1432             }
1433         }
1434         else
1435         {
1436             memcpy( p_psi->buffer, p, p_data->p_payload_end - p );
1437             p_psi->i_read_in_section += p_data->p_payload_end - p;
1438
1439             p_psi->p_current += p_data->p_payload_end - p;
1440         }
1441     }
1442
1443 #undef p_psi
1444 #undef p
1445
1446     input_DeletePacket( p_input->p_method_data, p_data );
1447
1448     return ;
1449 }
1450
1451 /*****************************************************************************
1452  * DecodePAT : Decodes Programm association table and deal with it
1453  *****************************************************************************/
1454 static void input_DecodePAT( input_thread_t * p_input, es_descriptor_t * p_es )
1455 {
1456     stream_ts_data_t  * p_stream_data;
1457     es_ts_data_t      * p_demux_data;
1458
1459     pgrm_descriptor_t * p_pgrm;
1460     es_descriptor_t   * p_current_es;
1461     byte_t            * p_current_data;
1462
1463     int                 i_section_length, i_program_id, i_pmt_pid;
1464     int                 i_loop, i_current_section;
1465
1466     boolean_t           b_changed = 0;
1467
1468     p_demux_data = (es_ts_data_t *)p_es->p_demux_data;
1469     p_stream_data = (stream_ts_data_t *)p_input->stream.p_demux_data;
1470
1471 #define p_psi (p_demux_data->p_psi_section)
1472
1473     /* Not so fast, Mike ! If the PAT version has changed, we first check
1474      * that its content has really changed before doing anything */
1475     if( p_stream_data->i_pat_version != p_psi->i_version_number )
1476     {
1477         int i_programs = p_input->stream.i_pgrm_number;
1478
1479         p_current_data = p_psi->buffer;
1480
1481         do
1482         {
1483             i_section_length = ((u32)(p_current_data[1] & 0xF) << 8) |
1484                                  p_current_data[2];
1485             i_current_section = (u8)p_current_data[6];
1486
1487             for( i_loop = 0;
1488                  ( i_loop < (i_section_length - 9) / 4 ) && !b_changed;
1489                  i_loop++ )
1490             {
1491                 i_program_id = ( (u32)*(p_current_data + i_loop * 4 + 8) << 8 )
1492                                  | *(p_current_data + i_loop * 4 + 9);
1493                 i_pmt_pid = ( ((u32)*(p_current_data + i_loop * 4 + 10) & 0x1F)
1494                                     << 8 )
1495                                | *(p_current_data + i_loop * 4 + 11);
1496
1497                 if( i_program_id )
1498                 {
1499                     if( (p_pgrm = input_FindProgram( p_input, i_program_id ))
1500                         && (p_current_es = input_FindES( p_input, i_pmt_pid ))
1501                         && p_current_es->p_pgrm == p_pgrm
1502                         && p_current_es->i_id == i_pmt_pid
1503                         && ((es_ts_data_t *)p_current_es->p_demux_data)->b_psi
1504                         && ((es_ts_data_t *)p_current_es->p_demux_data)
1505                             ->i_psi_type == PSI_IS_PMT )
1506                     {
1507                         i_programs--;
1508                     }
1509                     else
1510                     {
1511                         b_changed = 1;
1512                     }
1513                 }
1514             }
1515
1516             p_current_data += 3 + i_section_length;
1517
1518         } while( ( i_current_section < p_psi->i_last_section_number )
1519                   && !b_changed );
1520
1521         /* If we didn't find the expected amount of programs, the PAT has
1522          * changed. Otherwise, it only changed if b_changed is already != 0 */
1523         b_changed = b_changed || i_programs;
1524     }
1525
1526     if( b_changed )
1527     {
1528         /* PAT has changed. We are going to delete all programs and
1529          * create new ones. We chose not to only change what was needed
1530          * as a PAT change may mean the stream is radically changing and
1531          * this is a secure method to avoid crashes */
1532         es_ts_data_t      * p_es_demux;
1533         pgrm_ts_data_t    * p_pgrm_demux;
1534
1535         p_current_data = p_psi->buffer;
1536
1537         /* Delete all programs */
1538         while( p_input->stream.i_pgrm_number )
1539         {
1540             input_DelProgram( p_input, p_input->stream.pp_programs[0] );
1541         }
1542
1543         do
1544         {
1545             i_section_length = ((u32)(p_current_data[1] & 0xF) << 8) |
1546                                  p_current_data[2];
1547             i_current_section = (u8)p_current_data[6];
1548
1549             for( i_loop = 0; i_loop < (i_section_length - 9) / 4 ; i_loop++ )
1550             {
1551                 i_program_id = ( (u32)*(p_current_data + i_loop * 4 + 8) << 8 )
1552                                  | *(p_current_data + i_loop * 4 + 9);
1553                 i_pmt_pid = ( ((u32)*(p_current_data + i_loop * 4 + 10) & 0x1F)
1554                                     << 8 )
1555                                | *(p_current_data + i_loop * 4 + 11);
1556
1557                 /* If program = 0, we're having info about NIT not PMT */
1558                 if( i_program_id )
1559                 {
1560                     /* Add this program */
1561                     p_pgrm = input_AddProgram( p_input, i_program_id,
1562                                                sizeof( pgrm_ts_data_t ) );
1563
1564                     /* whatis the PID of the PMT of this program */
1565                     p_pgrm_demux = (pgrm_ts_data_t *)p_pgrm->p_demux_data;
1566                     p_pgrm_demux->i_pmt_version = PMT_UNINITIALIZED;
1567
1568                     /* Add the PMT ES to this program */
1569                     p_current_es = input_AddES( p_input, p_pgrm,(u16)i_pmt_pid,
1570                                         sizeof( es_ts_data_t) );
1571                     p_es_demux = (es_ts_data_t *)p_current_es->p_demux_data;
1572                     p_es_demux->b_psi = 1;
1573                     p_es_demux->i_psi_type = PSI_IS_PMT;
1574
1575                     p_es_demux->p_psi_section =
1576                                             malloc( sizeof( psi_section_t ) );
1577                     p_es_demux->p_psi_section->b_is_complete = 0;
1578                 }
1579             }
1580
1581             p_current_data += 3 + i_section_length;
1582
1583         } while( i_current_section < p_psi->i_last_section_number );
1584
1585         /* Go to the beginning of the next section */
1586         p_stream_data->i_pat_version = p_psi->i_version_number;
1587
1588     }
1589 #undef p_psi
1590
1591     /* FIXME This has nothing to do here */
1592     if( !p_input->stream.p_selected_program )
1593     {
1594         input_SetProgram( p_input, p_input->stream.pp_programs[0] );
1595     }
1596 }
1597
1598 /*****************************************************************************
1599  * DecodePMT : decode a given Program Stream Map
1600  * ***************************************************************************
1601  * When the PMT changes, it may mean a deep change in the stream, and it is
1602  * careful to delete the ES and add them again. If the PMT doesn't change,
1603  * there no need to do anything.
1604  *****************************************************************************/
1605 static void input_DecodePMT( input_thread_t * p_input, es_descriptor_t * p_es )
1606 {
1607
1608     pgrm_ts_data_t            * p_pgrm_data;
1609     es_ts_data_t              * p_demux_data;
1610
1611     p_demux_data = (es_ts_data_t *)p_es->p_demux_data;
1612     p_pgrm_data = (pgrm_ts_data_t *)p_es->p_pgrm->p_demux_data;
1613
1614 #define p_psi (p_demux_data->p_psi_section)
1615
1616     if( p_psi->i_version_number != p_pgrm_data->i_pmt_version )
1617     {
1618         es_descriptor_t   * p_new_es;
1619         es_ts_data_t      * p_es_demux;
1620         byte_t            * p_current_data, * p_current_section;
1621         int                 i_section_length,i_current_section;
1622         int                 i_prog_info_length, i_loop;
1623         int                 i_es_info_length, i_pid, i_stream_type;
1624         int                 i_audio_es, i_spu_es;
1625         int                 i_required_audio_es, i_required_spu_es;
1626
1627         p_current_section = p_psi->buffer;
1628         p_current_data = p_psi->buffer;
1629
1630         p_pgrm_data->i_pcr_pid = ( ((u32)*(p_current_section + 8) & 0x1F) << 8 ) |
1631                                     *(p_current_section + 9);
1632
1633         i_audio_es = 0;
1634         i_spu_es = 0;
1635
1636         /* Lock stream information */
1637         vlc_mutex_lock( &p_input->stream.stream_lock );
1638
1639         /* Get the number of the required audio stream */
1640         if( p_main->b_audio )
1641         {
1642             /* Default is the first one */
1643             i_required_audio_es = config_GetIntVariable( "input_channel" );
1644             if( i_required_audio_es < 0 )
1645             {
1646                 i_required_audio_es = 1;
1647             }
1648         }
1649         else
1650         {
1651             i_required_audio_es = 0;
1652         }
1653
1654         /* Same thing for subtitles */
1655         if( p_main->b_video )
1656         {
1657             /* for spu, default is none */
1658             i_required_spu_es = config_GetIntVariable( "input_subtitle" );
1659             if( i_required_spu_es < 0 )
1660             {
1661                 i_required_spu_es = 0;
1662             }
1663         }
1664         else
1665         {
1666             i_required_spu_es = 0;
1667         }
1668
1669         /* Delete all ES in this program  except the PSI. We start from the
1670          * end because i_es_number gets decremented after each deletion. */
1671         for( i_loop = p_es->p_pgrm->i_es_number ; i_loop ; )
1672         {
1673             i_loop--;
1674             p_es_demux = (es_ts_data_t *)
1675                          p_es->p_pgrm->pp_es[i_loop]->p_demux_data;
1676             if ( ! p_es_demux->b_psi )
1677             {
1678                 input_DelES( p_input, p_es->p_pgrm->pp_es[i_loop] );
1679             }
1680         }
1681
1682         /* Then add what we received in this PMT */
1683         do
1684         {
1685             i_section_length = ( ((u32)*(p_current_data + 1) & 0xF) << 8 ) |
1686                                   *(p_current_data + 2);
1687             i_current_section = (u8)p_current_data[6];
1688             i_prog_info_length = ( ((u32)*(p_current_data + 10) & 0xF) << 8 ) |
1689                                     *(p_current_data + 11);
1690
1691             /* For the moment we ignore program descriptors */
1692             p_current_data += 12 + i_prog_info_length;
1693
1694             /* The end of the section, before the CRC is at
1695              * p_current_section + i_section_length -1 */
1696             while( p_current_data < p_current_section + i_section_length -1 )
1697             {
1698                 i_stream_type = (int)p_current_data[0];
1699                 i_pid = ( ((u32)*(p_current_data + 1) & 0x1F) << 8 ) |
1700                            *(p_current_data + 2);
1701                 i_es_info_length = ( ((u32)*(p_current_data + 3) & 0xF) << 8 ) |
1702                                       *(p_current_data + 4);
1703
1704                 /* Add this ES to the program */
1705                 p_new_es = input_AddES( p_input, p_es->p_pgrm,
1706                                         (u16)i_pid, sizeof( es_ts_data_t ) );
1707
1708                 /* Tell the decoders what kind of stream it is */
1709                 p_new_es->i_type = i_stream_type;
1710
1711                 /* Tell the interface what kind of stream it is and select
1712                  * the required ones */
1713                 if ( p_input->stream.p_selected_program == p_new_es->p_pgrm )
1714                 {
1715                     switch( i_stream_type )
1716                     {
1717                         case MPEG1_VIDEO_ES:
1718                         case MPEG2_VIDEO_ES:
1719                             p_new_es->i_cat = VIDEO_ES;
1720                             input_SelectES( p_input, p_new_es );
1721                             break;
1722                         case MPEG1_AUDIO_ES:
1723                         case MPEG2_AUDIO_ES:
1724                             p_new_es->i_cat = AUDIO_ES;
1725                             i_audio_es += 1;
1726                             if( i_audio_es == i_required_audio_es )
1727                                 input_SelectES( p_input, p_new_es );
1728                             break;
1729                         case LPCM_AUDIO_ES :
1730                         case AC3_AUDIO_ES :
1731                             p_new_es->i_stream_id = 0xBD;
1732                             p_new_es->i_cat = AUDIO_ES;
1733                             i_audio_es += 1;
1734                             if( i_audio_es == i_required_audio_es )
1735                                 input_SelectES( p_input, p_new_es );
1736                             break;
1737                         /* Not sure this one is fully specification-compliant */
1738                         case DVD_SPU_ES :
1739                             p_new_es->i_stream_id = 0xBD;
1740                             p_new_es->i_cat = SPU_ES;
1741                             i_spu_es += 1;
1742                             if( i_spu_es == i_required_spu_es )
1743                                 input_SelectES( p_input, p_new_es );
1744                             break;
1745                         default :
1746                             p_new_es->i_cat = UNKNOWN_ES;
1747                             break;
1748                     }
1749                 }
1750
1751                 p_current_data += 5 + i_es_info_length;
1752             }
1753
1754             /* Go to the beginning of the next section*/
1755             p_current_data += 3 + i_section_length;
1756
1757             p_current_section++;
1758
1759         } while( i_current_section < p_psi->i_last_section_number );
1760
1761         if( i_required_audio_es > i_audio_es )
1762         {
1763             intf_WarnMsg( 2, "input: non-existing audio ES required" );
1764         }
1765
1766         if( i_required_spu_es > i_spu_es )
1767         {
1768             intf_WarnMsg( 2, "input: non-existing subtitles ES required" );
1769         }
1770
1771         p_pgrm_data->i_pmt_version = p_psi->i_version_number;
1772
1773         /* inform interface that stream has changed */
1774         p_input->stream.b_changed = 1;
1775         /*  Remove lock */
1776         vlc_mutex_unlock( &p_input->stream.stream_lock );
1777     }
1778
1779 #undef p_psi
1780 }
1781