git.sesse.net Git - vlc/blob - plugins/mpeg_vdec/vpar_headers.c

   1 /*****************************************************************************
   2  * vpar_headers.c : headers parsing
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 VideoLAN
   5  * $Id: vpar_headers.c,v 1.23 2002/06/01 12:32:00 sam Exp $
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *          Stéphane Borel <stef@via.ecp.fr>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <stdlib.h>                                                /* free() */
  29 #include <string.h>                                    /* memcpy(), memset() */
  30
  31 #include <vlc/vlc.h>
  32 #include <vlc/vout.h>
  33 #include <vlc/decoder.h>
  34
  35 #include "vdec_ext-plugins.h"
  36 #include "vpar_pool.h"
  37 #include "video_parser.h"
  38 #include "video_decoder.h"
  39
  40 /*
  41  * Local prototypes
  42  */
  43 static inline void NextStartCode( bit_stream_t * );
  44 static void SequenceHeader( vpar_thread_t * p_vpar );
  45 static void GroupHeader( vpar_thread_t * p_vpar );
  46 static void PictureHeader( vpar_thread_t * p_vpar );
  47 static void ExtensionAndUserData( vpar_thread_t * p_vpar );
  48 static void QuantMatrixExtension( vpar_thread_t * p_vpar );
  49 static void SequenceScalableExtension( vpar_thread_t * p_vpar );
  50 static void SequenceDisplayExtension( vpar_thread_t * p_vpar );
  51 static void PictureDisplayExtension( vpar_thread_t * p_vpar );
  52 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar );
  53 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar );
  54 static void CopyrightExtension( vpar_thread_t * p_vpar );
  55
  56 /*
  57  * Standard variables
  58  */
  59
  60 /*****************************************************************************
  61  * pi_default_intra_quant : default quantization matrix
  62  *****************************************************************************/
  63 u8 pi_default_intra_quant[] ATTR_ALIGN(16) =
  64 {
  65     8,  16, 19, 22, 26, 27, 29, 34,
  66     16, 16, 22, 24, 27, 29, 34, 37,
  67     19, 22, 26, 27, 29, 34, 34, 38,
  68     22, 22, 26, 27, 29, 34, 37, 40,
  69     22, 26, 27, 29, 32, 35, 40, 48,
  70     26, 27, 29, 32, 35, 40, 48, 58,
  71     26, 27, 29, 34, 38, 46, 56, 69,
  72     27, 29, 35, 38, 46, 56, 69, 83
  73 };
  74
  75 /*****************************************************************************
  76  * pi_default_nonintra_quant : default quantization matrix
  77  *****************************************************************************/
  78 u8 pi_default_nonintra_quant[] ATTR_ALIGN(16) =
  79 {
  80     16, 16, 16, 16, 16, 16, 16, 16,
  81     16, 16, 16, 16, 16, 16, 16, 16,
  82     16, 16, 16, 16, 16, 16, 16, 16,
  83     16, 16, 16, 16, 16, 16, 16, 16,
  84     16, 16, 16, 16, 16, 16, 16, 16,
  85     16, 16, 16, 16, 16, 16, 16, 16,
  86     16, 16, 16, 16, 16, 16, 16, 16,
  87     16, 16, 16, 16, 16, 16, 16, 16
  88 };
  89
  90 /*****************************************************************************
  91  * pi_scan : zig-zag and alternate scan patterns
  92  *****************************************************************************/
  93 u8 pi_scan[2][64] ATTR_ALIGN(16) =
  94 {
  95     { /* Zig-Zag pattern */
  96         0,1,8,16,9,2,3,10,17,24,32,25,18,11,4,5,
  97         12,19,26,33,40,48,41,34,27,20,13,6,7,14,21,28,
  98         35,42,49,56,57,50,43,36,29,22,15,23,30,37,44,51,
  99         58,59,52,45,38,31,39,46,53,60,61,54,47,55,62,63
 100     },
 101     { /* Alternate scan pattern */
 102         0,8,16,24,1,9,2,10,17,25,32,40,48,56,57,49,
 103         41,33,26,18,3,11,4,12,19,27,34,42,50,58,35,43,
 104         51,59,20,28,5,13,6,14,21,29,36,44,52,60,37,45,
 105         53,61,22,30,7,15,23,31,38,46,54,62,39,47,55,63
 106     }
 107 };
 108
 109 /*
 110  * Local inline functions.
 111  */
 112
 113 /*****************************************************************************
 114  * ReferenceUpdate : Update the reference pointers when we have a new picture
 115  *****************************************************************************/
 116 static void inline ReferenceUpdate( vpar_thread_t * p_vpar,
 117                                     int i_coding_type, picture_t * p_newref )
 118 {
 119     if( i_coding_type != B_CODING_TYPE )
 120     {
 121         if( p_vpar->sequence.p_forward != NULL )
 122         {
 123             vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_forward );
 124         }
 125         if( p_vpar->sequence.p_backward != NULL )
 126         {
 127             vout_DatePicture( p_vpar->p_vout, p_vpar->sequence.p_backward,
 128                               vpar_SynchroDate( p_vpar ) );
 129         }
 130         p_vpar->sequence.p_forward = p_vpar->sequence.p_backward;
 131         p_vpar->sequence.p_backward = p_newref;
 132         if( p_newref != NULL )
 133         {
 134             vout_LinkPicture( p_vpar->p_vout, p_newref );
 135         }
 136     }
 137     else if( p_newref != NULL )
 138     {
 139         /* Put date immediately. */
 140         vout_DatePicture( p_vpar->p_vout, p_newref, vpar_SynchroDate(p_vpar) );
 141     }
 142 }
 143
 144 /*****************************************************************************
 145  * ReferenceReplace : Replace the last reference pointer when we destroy
 146  *                    a picture
 147  *****************************************************************************/
 148 static void inline ReferenceReplace( vpar_thread_t * p_vpar,
 149                                      int i_coding_type, picture_t * p_newref )
 150 {
 151     if( i_coding_type != B_CODING_TYPE )
 152     {
 153         if( p_vpar->sequence.p_backward != NULL )
 154         {
 155             vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_backward );
 156         }
 157         p_vpar->sequence.p_backward = p_newref;
 158         if( p_newref != NULL )
 159         {
 160             vout_LinkPicture( p_vpar->p_vout, p_newref );
 161         }
 162     }
 163 }
 164
 165 /*****************************************************************************
 166  * LoadMatrix : Load a quantization matrix
 167  *****************************************************************************/
 168 static inline void LoadMatrix( vpar_thread_t * p_vpar,
 169                                quant_matrix_t * p_matrix )
 170 {
 171     int i_dummy;
 172
 173     if( !p_matrix->b_allocated )
 174     {
 175         /* Allocate a piece of memory to load the matrix. */
 176         if( (p_matrix->pi_matrix = (u8 *)malloc( 64*sizeof(u8) )) == NULL )
 177         {
 178             msg_Err( p_vpar->p_fifo, "out of memory" );
 179             p_vpar->p_fifo->b_error = 1;
 180             return;
 181         }
 182         p_matrix->b_allocated = 1;
 183     }
 184
 185     for( i_dummy = 0; i_dummy < 64; i_dummy++ )
 186     {
 187         p_matrix->pi_matrix[p_vpar->ppi_scan[0][i_dummy]]
 188              = GetBits( &p_vpar->bit_stream, 8 );
 189     }
 190 }
 191
 192 /*****************************************************************************
 193  * LinkMatrix : Link a quantization matrix to another
 194  *****************************************************************************/
 195 static inline void LinkMatrix( quant_matrix_t * p_matrix, u8 * pi_array )
 196 {
 197     if( p_matrix->b_allocated )
 198     {
 199         /* Deallocate the piece of memory. */
 200         free( p_matrix->pi_matrix );
 201         p_matrix->b_allocated = 0;
 202     }
 203
 204     p_matrix->pi_matrix = pi_array;
 205 }
 206
 207 /*****************************************************************************
 208  * ChromaToFourCC: Return a FourCC value used by the video output.
 209  *****************************************************************************/
 210 static inline u64 ChromaToFourCC( int i_chroma )
 211 {
 212     switch( i_chroma )
 213     {
 214         case CHROMA_420:
 215             return FOURCC_I420;
 216
 217         case CHROMA_422:
 218             return FOURCC_I422;
 219
 220         case CHROMA_444:
 221             return FOURCC_I444;
 222
 223         default:
 224             /* This can't happen */
 225             return 0xdeadbeef;
 226     }
 227 }
 228
 229 /*
 230  * Exported functions.
 231  */
 232
 233 /*****************************************************************************
 234  * vpar_NextSequenceHeader : Find the next sequence header
 235  *****************************************************************************/
 236 int vpar_NextSequenceHeader( vpar_thread_t * p_vpar )
 237 {
 238     while( !p_vpar->p_fifo->b_die )
 239     {
 240         NextStartCode( &p_vpar->bit_stream );
 241         if( ShowBits( &p_vpar->bit_stream, 32 ) == SEQUENCE_HEADER_CODE )
 242         {
 243             return 0;
 244         }
 245         RemoveBits( &p_vpar->bit_stream, 8 );
 246     }
 247     return 1;
 248 }
 249
 250 /*****************************************************************************
 251  * vpar_ParseHeader : Parse the next header
 252  *****************************************************************************/
 253 int vpar_ParseHeader( vpar_thread_t * p_vpar )
 254 {
 255     NextStartCode( &p_vpar->bit_stream );
 256     switch( GetBits32( &p_vpar->bit_stream ) )
 257     {
 258     case SEQUENCE_HEADER_CODE:
 259         p_vpar->c_sequences++;
 260         SequenceHeader( p_vpar );
 261         return 0;
 262
 263     case GROUP_START_CODE:
 264         GroupHeader( p_vpar );
 265         return 0;
 266
 267     case PICTURE_START_CODE:
 268         PictureHeader( p_vpar );
 269         return 0;
 270
 271     case SEQUENCE_END_CODE:
 272         msg_Dbg( p_vpar->p_fifo, "sequence end code received" );
 273         if( p_vpar->sequence.p_backward != NULL )
 274         {
 275             p_vpar->sequence.p_backward->b_force = 1;
 276         }
 277         ReferenceUpdate( p_vpar, I_CODING_TYPE, NULL );
 278         return 1;
 279
 280     default:
 281         break;
 282     }
 283
 284     return 0;
 285 }
 286
 287 /*
 288  * Following functions are local
 289  */
 290
 291 /*****************************************************************************
 292  * SequenceHeader : Parse the next sequence header
 293  *****************************************************************************/
 294 static void SequenceHeader( vpar_thread_t * p_vpar )
 295 {
 296 #define RESERVED    -1
 297     static int i_frame_rate_table[16] =
 298     {
 299         0,
 300         23 * 1000,
 301         24 * 1001,
 302         25 * 1001,
 303         30 * 1000,
 304         30 * 1001,
 305         50 * 1001,
 306         60 * 1000,
 307         60 * 1001,
 308         RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED
 309     };
 310 #undef RESERVED
 311
 312     int i_height_save, i_width_save, i_aspect;
 313
 314     i_height_save = p_vpar->sequence.i_height;
 315     i_width_save = p_vpar->sequence.i_width;
 316
 317     p_vpar->sequence.i_width = GetBits( &p_vpar->bit_stream, 12 );
 318     p_vpar->sequence.i_height = GetBits( &p_vpar->bit_stream, 12 );
 319     i_aspect = GetBits( &p_vpar->bit_stream, 4 );
 320     p_vpar->sequence.i_frame_rate =
 321             i_frame_rate_table[ GetBits( &p_vpar->bit_stream, 4 ) ];
 322
 323     /* We don't need bit_rate_value, marker_bit, vbv_buffer_size,
 324      * constrained_parameters_flag */
 325     RemoveBits( &p_vpar->bit_stream, 30 );
 326
 327     /*
 328      * Quantization matrices
 329      */
 330     if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_intra_quantizer_matrix */
 331     {
 332         LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
 333     }
 334     else
 335     {
 336         /* Use default matrix. */
 337         LinkMatrix( &p_vpar->sequence.intra_quant,
 338                     p_vpar->pi_default_intra_quant );
 339     }
 340
 341     if( GetBits(&p_vpar->bit_stream, 1) ) /* load_non_intra_quantizer_matrix */
 342     {
 343         LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
 344     }
 345     else
 346     {
 347         /* Use default matrix. */
 348         LinkMatrix( &p_vpar->sequence.nonintra_quant,
 349                     p_vpar->pi_default_nonintra_quant );
 350     }
 351
 352     /* Unless later overwritten by a matrix extension, we have the same
 353      * matrices for luminance and chrominance. */
 354     LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 355                 p_vpar->sequence.intra_quant.pi_matrix );
 356     LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
 357                 p_vpar->sequence.nonintra_quant.pi_matrix );
 358
 359     /*
 360      * Sequence Extension
 361      */
 362     NextStartCode( &p_vpar->bit_stream );
 363     if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
 364     {
 365         int                         i_dummy;
 366
 367         /* Turn the MPEG2 flag on */
 368         p_vpar->sequence.b_mpeg2 = 1;
 369
 370         /* Parse sequence_extension */
 371         RemoveBits32( &p_vpar->bit_stream );
 372         /* extension_start_code_identifier, profile_and_level_indication */
 373         RemoveBits( &p_vpar->bit_stream, 12 );
 374         p_vpar->sequence.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
 375         p_vpar->sequence.i_chroma_format = GetBits( &p_vpar->bit_stream, 2 );
 376         p_vpar->sequence.i_width |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
 377         p_vpar->sequence.i_height |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
 378         /* bit_rate_extension, marker_bit, vbv_buffer_size_extension,
 379          * low_delay */
 380         RemoveBits( &p_vpar->bit_stream, 22 );
 381         /* frame_rate_extension_n */
 382         i_dummy = GetBits( &p_vpar->bit_stream, 2 );
 383         /* frame_rate_extension_d */
 384         p_vpar->sequence.i_frame_rate *= (i_dummy + 1)
 385                                   / (GetBits( &p_vpar->bit_stream, 5 ) + 1);
 386     }
 387     else
 388     {
 389         /* It's an MPEG-1 stream. Put adequate parameters. */
 390         int i_xyratio;
 391         static int pi_mpeg1ratio[15] = {
 392             10000, 10000,  6735,  7031,  7615,  8055,  8437, 8935,
 393              9157,  9815, 10255, 10695, 10950, 11575, 12015
 394         };
 395
 396         if( i_aspect > 1 )
 397         {
 398                 i_xyratio = p_vpar->sequence.i_height *
 399                         pi_mpeg1ratio[i_aspect] / p_vpar->sequence.i_width;
 400                 if( 7450 < i_xyratio && i_xyratio < 7550 )
 401                 {
 402                         i_aspect = 2;
 403                 }
 404                 else if( 5575 < i_xyratio && i_xyratio < 5675 )
 405                 {
 406                         i_aspect = 3;
 407                 }
 408                 else if( 4475 < i_xyratio && i_xyratio < 4575 )
 409                 {
 410                         i_aspect = 4;
 411                 }
 412         }
 413
 414         p_vpar->sequence.b_mpeg2 = 0;
 415         p_vpar->sequence.b_progressive = 1;
 416         p_vpar->sequence.i_chroma_format = CHROMA_420;
 417     }
 418
 419     /* check whether the input gives a particular aspect ratio */
 420     if( p_vpar->p_fifo->p_demux_data
 421          && ( *(int*)(p_vpar->p_fifo->p_demux_data) & 0x7 ) )
 422     {
 423         i_aspect = *(int*)(p_vpar->p_fifo->p_demux_data);
 424     }
 425
 426     /* Store calculated aspect ratio */
 427     switch( i_aspect )
 428     {
 429         case AR_3_4_PICTURE:
 430             p_vpar->sequence.i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 431             break;
 432
 433         case AR_16_9_PICTURE:
 434             p_vpar->sequence.i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
 435             break;
 436
 437         case AR_221_1_PICTURE:
 438             p_vpar->sequence.i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
 439             break;
 440
 441         case AR_SQUARE_PICTURE:
 442         default:
 443             p_vpar->sequence.i_aspect = VOUT_ASPECT_FACTOR
 444                     * p_vpar->sequence.i_width / p_vpar->sequence.i_height;
 445             break;
 446     }
 447
 448     /* Update sizes */
 449     p_vpar->sequence.i_mb_width = (p_vpar->sequence.i_width + 15) / 16;
 450     p_vpar->sequence.i_mb_height = (p_vpar->sequence.b_progressive) ?
 451                                    (p_vpar->sequence.i_height + 15) / 16 :
 452                                    2 * ((p_vpar->sequence.i_height + 31) / 32);
 453     p_vpar->sequence.i_mb_size = p_vpar->sequence.i_mb_width
 454                                         * p_vpar->sequence.i_mb_height;
 455     p_vpar->sequence.i_width = (p_vpar->sequence.i_mb_width * 16);
 456     p_vpar->sequence.i_height = (p_vpar->sequence.i_mb_height * 16);
 457     p_vpar->sequence.i_size = p_vpar->sequence.i_width
 458                                         * p_vpar->sequence.i_height;
 459     switch( p_vpar->sequence.i_chroma_format )
 460     {
 461     case CHROMA_420:
 462         p_vpar->sequence.i_chroma_nb_blocks = 2;
 463         p_vpar->sequence.b_chroma_h_subsampled = 1;
 464         p_vpar->sequence.b_chroma_v_subsampled = 1;
 465         break;
 466     case CHROMA_422:
 467         p_vpar->sequence.i_chroma_nb_blocks = 4;
 468         p_vpar->sequence.b_chroma_h_subsampled = 1;
 469         p_vpar->sequence.b_chroma_v_subsampled = 0;
 470         break;
 471     case CHROMA_444:
 472         p_vpar->sequence.i_chroma_nb_blocks = 6;
 473         p_vpar->sequence.b_chroma_h_subsampled = 0;
 474         p_vpar->sequence.b_chroma_v_subsampled = 0;
 475         break;
 476     }
 477
 478 #if 0
 479     if(    p_vpar->sequence.i_width != i_width_save
 480         || p_vpar->sequence.i_height != i_height_save )
 481     {
 482          /* FIXME: Warn the video output */
 483     }
 484 #endif
 485
 486     /* Extension and User data */
 487     ExtensionAndUserData( p_vpar );
 488
 489     /* Spawn a video output if there is none */
 490
 491     p_vpar->p_vout = vlc_object_find( p_vpar->p_fifo->p_vlc, VLC_OBJECT_VOUT,
 492                                                              FIND_CHILD );
 493
 494     if( p_vpar->p_vout )
 495     {
 496         if( p_vpar->p_vout->render.i_width != p_vpar->sequence.i_width
 497              || p_vpar->p_vout->render.i_height != p_vpar->sequence.i_height
 498              || p_vpar->p_vout->render.i_chroma != ChromaToFourCC( p_vpar->sequence.i_chroma_format )
 499              || p_vpar->p_vout->render.i_aspect != p_vpar->sequence.i_aspect )
 500         {
 501             /* We are not interested in this format, close this vout */
 502             vlc_object_unlink_all( p_vpar->p_vout );
 503             vlc_object_release( p_vpar->p_vout );
 504             vout_DestroyThread( p_vpar->p_vout );
 505             p_vpar->p_vout = NULL;
 506         }
 507         else
 508         {
 509             /* This video output is cool! Hijack it. */
 510             vlc_object_unlink_all( p_vpar->p_vout );
 511             vlc_object_attach( p_vpar->p_vout, p_vpar->p_fifo );
 512             vlc_object_release( p_vpar->p_vout );
 513         }
 514     }
 515
 516     if( p_vpar->p_vout == NULL )
 517     {
 518         msg_Dbg( p_vpar->p_fifo, "no vout present, spawning one" );
 519
 520         p_vpar->p_vout = vout_CreateThread( p_vpar->p_fifo->p_this,
 521                            p_vpar->sequence.i_width,
 522                            p_vpar->sequence.i_height,
 523                            ChromaToFourCC( p_vpar->sequence.i_chroma_format ),
 524                            p_vpar->sequence.i_aspect );
 525
 526         /* Everything failed */
 527         if( p_vpar->p_vout == NULL )
 528         {
 529             msg_Err( p_vpar->p_fifo, "cannot open vout, aborting" );
 530             p_vpar->p_fifo->b_error = 1;
 531             return;
 532         }
 533     }
 534 }
 535
 536 /*****************************************************************************
 537  * GroupHeader : Parse the next group of pictures header
 538  *****************************************************************************/
 539 static void GroupHeader( vpar_thread_t * p_vpar )
 540 {
 541     /* Nothing to do, we don't care. */
 542     RemoveBits( &p_vpar->bit_stream, 27 );
 543     ExtensionAndUserData( p_vpar );
 544 }
 545
 546 /*****************************************************************************
 547  * PictureHeader : Parse the next picture header
 548  *****************************************************************************/
 549 static void PictureHeader( vpar_thread_t * p_vpar )
 550 {
 551     int                 i_structure, i_previous_coding_type;
 552     vlc_bool_t          b_parsable = 0;
 553
 554     /* Retrieve the PTS. */
 555     CurrentPTS( &p_vpar->bit_stream, &p_vpar->sequence.next_pts,
 556                 &p_vpar->sequence.next_dts );
 557
 558     /* Recover in case of stream discontinuity. */
 559     if( p_vpar->sequence.b_expect_discontinuity )
 560     {
 561         ReferenceUpdate( p_vpar, I_CODING_TYPE, NULL );
 562         ReferenceUpdate( p_vpar, I_CODING_TYPE, NULL );
 563         if( p_vpar->picture.p_picture != NULL )
 564         {
 565             vout_DestroyPicture( p_vpar->p_vout, p_vpar->picture.p_picture );
 566             p_vpar->picture.p_picture = NULL;
 567         }
 568         p_vpar->picture.i_current_structure = 0;
 569         p_vpar->sequence.b_expect_discontinuity = 0;
 570     }
 571
 572     /* Parse the picture header. */
 573     RemoveBits( &p_vpar->bit_stream, 10 ); /* temporal_reference */
 574     i_previous_coding_type = p_vpar->picture.i_coding_type;
 575     p_vpar->picture.i_coding_type = GetBits( &p_vpar->bit_stream, 3 );
 576     RemoveBits( &p_vpar->bit_stream, 16 ); /* vbv_delay */
 577
 578     if( p_vpar->picture.i_coding_type == P_CODING_TYPE
 579         || p_vpar->picture.i_coding_type == B_CODING_TYPE )
 580     {
 581         p_vpar->picture.ppi_f_code[0][1] = GetBits( &p_vpar->bit_stream, 1 );
 582         p_vpar->picture.ppi_f_code[0][0] = GetBits( &p_vpar->bit_stream, 3 )
 583                                             - 1;
 584     }
 585     if( p_vpar->picture.i_coding_type == B_CODING_TYPE )
 586     {
 587         p_vpar->picture.ppi_f_code[1][1] = GetBits( &p_vpar->bit_stream, 1 );
 588         p_vpar->picture.ppi_f_code[1][0] = GetBits( &p_vpar->bit_stream, 3 )
 589                                             - 1;
 590     }
 591
 592     /* extra_information_picture */
 593     while( GetBits( &p_vpar->bit_stream, 1 ) )
 594     {
 595         RemoveBits( &p_vpar->bit_stream, 8 );
 596     }
 597
 598     /*
 599      * Picture Coding Extension
 600      */
 601     NextStartCode( &p_vpar->bit_stream );
 602     if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
 603     {
 604         /* Parse picture_coding_extension */
 605         RemoveBits32( &p_vpar->bit_stream );
 606         /* extension_start_code_identifier */
 607         RemoveBits( &p_vpar->bit_stream, 4 );
 608
 609         /* Pre-substract 1 for later use in MotionDelta(). */
 610         p_vpar->picture.ppi_f_code[0][0] = GetBits( &p_vpar->bit_stream, 4 ) -1;
 611         p_vpar->picture.ppi_f_code[0][1] = GetBits( &p_vpar->bit_stream, 4 ) -1;
 612         p_vpar->picture.ppi_f_code[1][0] = GetBits( &p_vpar->bit_stream, 4 ) -1;
 613         p_vpar->picture.ppi_f_code[1][1] = GetBits( &p_vpar->bit_stream, 4 ) -1;
 614         p_vpar->picture.i_intra_dc_precision = GetBits( &p_vpar->bit_stream, 2 );
 615         i_structure = GetBits( &p_vpar->bit_stream, 2 );
 616         p_vpar->picture.b_top_field_first = GetBits( &p_vpar->bit_stream, 1 );
 617         p_vpar->picture.b_frame_pred_frame_dct
 618              = GetBits( &p_vpar->bit_stream, 1 );
 619         p_vpar->picture.b_concealment_mv = GetBits( &p_vpar->bit_stream, 1 );
 620         p_vpar->picture.b_q_scale_type = GetBits( &p_vpar->bit_stream, 1 );
 621         p_vpar->picture.b_intra_vlc_format = GetBits( &p_vpar->bit_stream, 1 );
 622         /* Alternate scan */
 623         p_vpar->picture.pi_scan =
 624             p_vpar->ppi_scan[ GetBits( &p_vpar->bit_stream, 1 ) ];
 625         p_vpar->picture.b_repeat_first_field = GetBits( &p_vpar->bit_stream, 1 );
 626         /* chroma_420_type (obsolete) */
 627         RemoveBits( &p_vpar->bit_stream, 1 );
 628         p_vpar->picture.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
 629
 630         /* composite_display_flag */
 631         if( GetBits( &p_vpar->bit_stream, 1 ) )
 632         {
 633             /* v_axis, field_sequence, sub_carrier, burst_amplitude,
 634              * sub_carrier_phase */
 635             RemoveBits( &p_vpar->bit_stream, 20 );
 636         }
 637     }
 638     else
 639     {
 640         /* MPEG-1 compatibility flags */
 641         p_vpar->picture.i_intra_dc_precision = 0; /* 8 bits */
 642         i_structure = FRAME_STRUCTURE;
 643         p_vpar->picture.b_top_field_first = 0;
 644         p_vpar->picture.b_frame_pred_frame_dct = 1;
 645         p_vpar->picture.b_concealment_mv = 0;
 646         p_vpar->picture.b_q_scale_type = 0;
 647         p_vpar->picture.b_intra_vlc_format = 0;
 648         p_vpar->picture.pi_scan = p_vpar->ppi_scan[0];
 649         p_vpar->picture.b_repeat_first_field = 0;
 650         p_vpar->picture.b_progressive = 1;
 651     }
 652
 653     /* Extension and User data. */
 654     ExtensionAndUserData( p_vpar );
 655
 656     p_vpar->pc_pictures[p_vpar->picture.i_coding_type]++;
 657
 658     if( p_vpar->picture.i_current_structure )
 659     {
 660         if ( (i_structure == FRAME_STRUCTURE ||
 661               i_structure == p_vpar->picture.i_current_structure) )
 662         {
 663             /* We don't have the second field of the buffered frame. */
 664             if( p_vpar->picture.p_picture != NULL )
 665             {
 666                 ReferenceReplace( p_vpar,
 667                                   p_vpar->picture.i_coding_type,
 668                                   NULL );
 669                 vout_DestroyPicture( p_vpar->p_vout,
 670                                      p_vpar->picture.p_picture );
 671                 p_vpar->picture.p_picture = NULL;
 672             }
 673
 674             p_vpar->picture.i_current_structure = 0;
 675
 676             msg_Warn( p_vpar->p_fifo, "odd number of field pictures" );
 677         }
 678         else
 679         {
 680             /* Second field of a frame. We will decode it if, and only if we
 681              * have decoded the first field. */
 682             if( p_vpar->picture.p_picture == NULL )
 683             {
 684                 if( (p_vpar->picture.i_coding_type == I_CODING_TYPE
 685                       && p_vpar->sequence.p_backward == NULL) )
 686                 {
 687                     /* Exceptionnally, parse the picture if it is I. We need
 688                      * this in case of an odd number of field pictures, if the
 689                      * previous picture is not intra, we desperately need a
 690                      * new reference picture. OK, this is kind of kludgy. */
 691                     p_vpar->picture.i_current_structure = 0;
 692                 }
 693                 else
 694                 {
 695                     b_parsable = 0;
 696                 }
 697             }
 698             else
 699             {
 700                 /* We suppose we have the reference pictures, since we already
 701                  * decoded the first field and the second field will not need
 702                  * any extra reference picture. There is a special case of
 703                  * P field being the second field of an I field, but ISO/IEC
 704                  * 13818-2 section 7.6.3.5 specifies that this P field will
 705                  * not need any reference picture besides the I field. So far
 706                  * so good. */
 707                 b_parsable = 1;
 708
 709                 if( p_vpar->picture.i_coding_type == P_CODING_TYPE &&
 710                     i_previous_coding_type == I_CODING_TYPE &&
 711                     p_vpar->sequence.p_forward == NULL )
 712                 {
 713                     /* This is the special case of section 7.6.3.5. Create
 714                      * a fake reference picture (which will not be used)
 715                      * but will prevent us from segfaulting in the slice
 716                      * parsing. */
 717                     static picture_t    fake_picture;
 718                     fake_picture.i_planes = 0; /* We will use it later */
 719                     p_vpar->sequence.p_forward = &fake_picture;
 720                 }
 721             }
 722         }
 723     }
 724
 725     if( !p_vpar->picture.i_current_structure )
 726     {
 727         /* First field of a frame, or new frame picture. */
 728         int     i_repeat_field;
 729
 730         /* Do we have the reference pictures ? */
 731         b_parsable = !(((p_vpar->picture.i_coding_type == P_CODING_TYPE ||
 732                          p_vpar->picture.b_concealment_mv) &&
 733                         (p_vpar->sequence.p_backward == NULL)) ||
 734                          /* p_backward will become p_forward later */
 735                        ((p_vpar->picture.i_coding_type == B_CODING_TYPE) &&
 736                         (p_vpar->sequence.p_forward == NULL ||
 737                          p_vpar->sequence.p_backward == NULL)));
 738
 739         /* Compute the number of times the frame will be emitted by the
 740          * decoder (number of half-periods). */
 741         if( p_vpar->sequence.b_progressive )
 742         {
 743             i_repeat_field = (1 + p_vpar->picture.b_repeat_first_field
 744                                 + p_vpar->picture.b_top_field_first) * 2;
 745         }
 746         else
 747         {
 748             if( p_vpar->picture.b_progressive )
 749             {
 750                 i_repeat_field = 2 + p_vpar->picture.b_repeat_first_field;
 751             }
 752             else
 753             {
 754                 i_repeat_field = 2;
 755             }
 756         }
 757
 758         /* Warn synchro we have a new picture (updates pictures index). */
 759         vpar_SynchroNewPicture( p_vpar, p_vpar->picture.i_coding_type,
 760                                 i_repeat_field );
 761
 762         if( b_parsable )
 763         {
 764             /* Does synchro say we have enough time to decode it ? */
 765             b_parsable = vpar_SynchroChoose( p_vpar,
 766                                p_vpar->picture.i_coding_type, i_structure );
 767         }
 768     }
 769
 770     if( !b_parsable )
 771     {
 772         /* Update the reference pointers. */
 773         ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, NULL );
 774
 775         /* Update context. */
 776         if( i_structure != FRAME_STRUCTURE )
 777         {
 778             if( (p_vpar->picture.i_current_structure | i_structure)
 779                     == FRAME_STRUCTURE )
 780             {
 781                 /* The frame is complete. */
 782                 p_vpar->picture.i_current_structure = 0;
 783
 784                 vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
 785             }
 786             else
 787             {
 788                 p_vpar->picture.i_current_structure = i_structure;
 789             }
 790         }
 791         else
 792         {
 793             /* Warn Synchro we have trashed a picture. */
 794             vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
 795         }
 796         p_vpar->picture.p_picture = NULL;
 797
 798         return;
 799     }
 800
 801     /* OK, now we are sure we will decode the picture. */
 802     p_vpar->pc_decoded_pictures[p_vpar->picture.i_coding_type]++;
 803
 804 #define P_picture p_vpar->picture.p_picture
 805     p_vpar->picture.b_error = 0;
 806     p_vpar->picture.b_frame_structure = (i_structure == FRAME_STRUCTURE);
 807
 808     if( !p_vpar->picture.i_current_structure )
 809     {
 810         /* This is a new frame. Get a structure from the video_output. */
 811         while( ( P_picture = vout_CreatePicture( p_vpar->p_vout,
 812                                  p_vpar->picture.b_progressive,
 813                                  p_vpar->picture.b_top_field_first,
 814                                  p_vpar->picture.b_repeat_first_field ) )
 815                  == NULL )
 816         {
 817             if( p_vpar->p_fifo->b_die || p_vpar->p_fifo->b_error )
 818             {
 819                 return;
 820             }
 821             msleep( VOUT_OUTMEM_SLEEP );
 822         }
 823
 824         /* Initialize values. */
 825         vpar_SynchroDecode( p_vpar, p_vpar->picture.i_coding_type, i_structure );
 826         P_picture->i_matrix_coefficients = p_vpar->sequence.i_matrix_coefficients;
 827
 828         /* Update the reference pointers. */
 829         ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, P_picture );
 830     }
 831
 832     /* Initialize picture data for decoding. */
 833     p_vpar->picture.i_current_structure |= i_structure;
 834     p_vpar->picture.i_structure = i_structure;
 835     p_vpar->picture.b_second_field =
 836         (i_structure != p_vpar->picture.i_current_structure);
 837     p_vpar->picture.b_current_field =
 838         (i_structure == BOTTOM_FIELD );
 839     p_vpar->picture.i_lum_stride = p_vpar->picture.p_picture->Y_PITCH
 840         << ( 1 - p_vpar->picture.b_frame_structure );
 841     p_vpar->picture.i_chrom_stride = p_vpar->picture.p_picture->U_PITCH
 842         << ( 1 - p_vpar->picture.b_frame_structure );
 843     /* We suppose the pitch is the same for U and V planes. */
 844     p_vpar->picture.i_field_width = p_vpar->sequence.i_width
 845         << ( 1 - p_vpar->picture.b_frame_structure );
 846
 847     if( !p_vpar->p_fifo->p_stream_ctrl->b_grayscale )
 848     {
 849         switch( p_vpar->sequence.i_chroma_format )
 850         {
 851         case CHROMA_422:
 852             p_vpar->pool.pf_vdec_decode = vdec_DecodeMacroblock422;
 853             break;
 854         case CHROMA_444:
 855             p_vpar->pool.pf_vdec_decode = vdec_DecodeMacroblock444;
 856             break;
 857         case CHROMA_420:
 858         default:
 859             p_vpar->pool.pf_vdec_decode = vdec_DecodeMacroblock420;
 860             break;
 861         }
 862     }
 863     else
 864     {
 865         p_vpar->pool.pf_vdec_decode = vdec_DecodeMacroblockBW;
 866     }
 867
 868
 869     if( p_vpar->sequence.b_mpeg2 )
 870     {
 871         static f_picture_data_t ppf_picture_data[4][4] =
 872         {
 873             {
 874                 NULL, NULL, NULL, NULL
 875             },
 876             {
 877                 /* TOP_FIELD */
 878 #if (VPAR_OPTIM_LEVEL > 1)
 879                 NULL, vpar_PictureData2IT, vpar_PictureData2PT,
 880                 vpar_PictureData2BT
 881 #else
 882                 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
 883                 vpar_PictureDataGENERIC
 884 #endif
 885             },
 886             {
 887                 /* BOTTOM_FIELD */
 888 #if (VPAR_OPTIM_LEVEL > 1)
 889                 NULL, vpar_PictureData2IB, vpar_PictureData2PB,
 890                 vpar_PictureData2BB
 891 #else
 892                 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
 893                 vpar_PictureDataGENERIC
 894 #endif
 895             },
 896             {
 897                 /* FRAME_PICTURE */
 898 #if (VPAR_OPTIM_LEVEL > 0)
 899                 NULL, vpar_PictureData2IF, vpar_PictureData2PF,
 900                 vpar_PictureData2BF
 901 #else
 902                 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
 903                 vpar_PictureDataGENERIC
 904 #endif
 905             }
 906         };
 907
 908         ppf_picture_data[p_vpar->picture.i_structure]
 909                         [p_vpar->picture.i_coding_type]( p_vpar );
 910     }
 911     else
 912     {
 913 #if (VPAR_OPTIM_LEVEL > 1)
 914         static f_picture_data_t pf_picture_data[5] =
 915         { NULL, vpar_PictureData1I, vpar_PictureData1P, vpar_PictureData1B,
 916           vpar_PictureData1D };
 917
 918         pf_picture_data[p_vpar->picture.i_coding_type]( p_vpar );
 919 #else
 920         vpar_PictureDataGENERIC( p_vpar );
 921 #endif
 922     }
 923
 924     /* Wait for all the macroblocks to be decoded. */
 925     p_vpar->pool.pf_wait_pool( &p_vpar->pool );
 926
 927     /* Re-spawn decoder threads if the user changed settings. */
 928     vpar_SpawnPool( p_vpar );
 929
 930     if( p_vpar->p_fifo->b_die || p_vpar->p_fifo->b_error )
 931     {
 932         return;
 933     }
 934
 935     if( p_vpar->sequence.p_forward != NULL &&
 936         p_vpar->sequence.p_forward->i_planes == 0 )
 937     {
 938         /* This can only happen with the fake picture created for section
 939          * 7.6.3.5. Clean up our mess. */
 940         p_vpar->sequence.p_forward = NULL;
 941     }
 942
 943     if( p_vpar->picture.b_error )
 944     {
 945         /* Trash picture. */
 946         p_vpar->pc_malformed_pictures[p_vpar->picture.i_coding_type]++;
 947
 948         vpar_SynchroEnd( p_vpar, p_vpar->picture.i_coding_type,
 949                          p_vpar->picture.i_structure, 1 );
 950         vout_DestroyPicture( p_vpar->p_vout, P_picture );
 951
 952         ReferenceReplace( p_vpar, p_vpar->picture.i_coding_type, NULL );
 953
 954         /* Prepare context for the next picture. */
 955         P_picture = NULL;
 956         if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
 957             p_vpar->picture.i_current_structure = 0;
 958     }
 959     else if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
 960     {
 961         /* Frame completely parsed. */
 962         vpar_SynchroEnd( p_vpar, p_vpar->picture.i_coding_type,
 963                          p_vpar->picture.i_structure, 0 );
 964         vout_DisplayPicture( p_vpar->p_vout, P_picture );
 965
 966         /* Prepare context for the next picture. */
 967         P_picture = NULL;
 968         p_vpar->picture.i_current_structure = 0;
 969     }
 970 #undef P_picture
 971 }
 972
 973 /*****************************************************************************
 974  * ExtensionAndUserData : Parse the extension_and_user_data structure
 975  *****************************************************************************/
 976 static void ExtensionAndUserData( vpar_thread_t * p_vpar )
 977 {
 978     while( !p_vpar->p_fifo->b_die )
 979     {
 980         NextStartCode( &p_vpar->bit_stream );
 981         switch( ShowBits( &p_vpar->bit_stream, 32 ) )
 982         {
 983         case EXTENSION_START_CODE:
 984             RemoveBits32( &p_vpar->bit_stream );
 985             switch( GetBits( &p_vpar->bit_stream, 4 ) )
 986             {
 987             case SEQUENCE_DISPLAY_EXTENSION_ID:
 988                 SequenceDisplayExtension( p_vpar );
 989                 break;
 990             case QUANT_MATRIX_EXTENSION_ID:
 991                 QuantMatrixExtension( p_vpar );
 992                 break;
 993             case SEQUENCE_SCALABLE_EXTENSION_ID:
 994                 SequenceScalableExtension( p_vpar );
 995                 break;
 996             case PICTURE_DISPLAY_EXTENSION_ID:
 997                 PictureDisplayExtension( p_vpar );
 998                 break;
 999             case PICTURE_SPATIAL_SCALABLE_EXTENSION_ID:
1000                 PictureSpatialScalableExtension( p_vpar );
1001                 break;
1002             case PICTURE_TEMPORAL_SCALABLE_EXTENSION_ID:
1003                 PictureTemporalScalableExtension( p_vpar );
1004                 break;
1005             case COPYRIGHT_EXTENSION_ID:
1006                 CopyrightExtension( p_vpar );
1007                 break;
1008             default:
1009                 break;
1010             }
1011             break;
1012
1013         case USER_DATA_START_CODE:
1014             RemoveBits32( &p_vpar->bit_stream );
1015             /* Wait for the next start code */
1016             break;
1017
1018         default:
1019             return;
1020         }
1021     }
1022 }
1023
1024
1025 /*****************************************************************************
1026  * SequenceDisplayExtension : Parse the sequence_display_extension structure *
1027  *****************************************************************************/
1028
1029 static void SequenceDisplayExtension( vpar_thread_t * p_vpar )
1030 {
1031     /* We don't care sequence_display_extension. */
1032     /* video_format */
1033     RemoveBits( &p_vpar->bit_stream, 3 );
1034     if( GetBits( &p_vpar->bit_stream, 1 ) )
1035     {
1036         /* Two bytes for color_desciption */
1037         RemoveBits( &p_vpar->bit_stream, 16 );
1038         p_vpar->sequence.i_matrix_coefficients = GetBits( &p_vpar->bit_stream, 8 );
1039     }
1040     /* display_horizontal and vertical_size and a marker_bit */
1041     RemoveBits( &p_vpar->bit_stream, 29 );
1042 }
1043
1044
1045 /*****************************************************************************
1046  * QuantMatrixExtension : Load quantization matrices for luminance           *
1047  *                        and chrominance                                    *
1048  *****************************************************************************/
1049
1050 static void QuantMatrixExtension( vpar_thread_t * p_vpar )
1051 {
1052     if( GetBits( &p_vpar->bit_stream, 1 ) )
1053     {
1054         /* Load intra_quantiser_matrix for luminance. */
1055         LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
1056     }
1057     else
1058     {
1059         /* Use the default matrix. */
1060         LinkMatrix( &p_vpar->sequence.intra_quant,
1061                     p_vpar->pi_default_intra_quant );
1062     }
1063     if( GetBits( &p_vpar->bit_stream, 1 ) )
1064     {
1065         /* Load non_intra_quantiser_matrix for luminance. */
1066         LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
1067     }
1068     else
1069     {
1070         /* Use the default matrix. */
1071         LinkMatrix( &p_vpar->sequence.nonintra_quant,
1072                     p_vpar->pi_default_nonintra_quant );
1073     }
1074     if( GetBits( &p_vpar->bit_stream, 1 ) )
1075     {
1076         /* Load intra_quantiser_matrix for chrominance. */
1077         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_intra_quant );
1078     }
1079     else
1080     {
1081         /* Link the chrominance intra matrix to the luminance one. */
1082         LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
1083                     p_vpar->sequence.intra_quant.pi_matrix );
1084     }
1085     if( GetBits( &p_vpar->bit_stream, 1 ) )
1086     {
1087         /* Load non_intra_quantiser_matrix for chrominance. */
1088         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
1089     }
1090     else
1091     {
1092         /* Link the chrominance nonintra matrix to the luminance one. */
1093         LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
1094                     p_vpar->sequence.nonintra_quant.pi_matrix );
1095     }
1096 }
1097
1098
1099 /*****************************************************************************
1100  * SequenceScalableExtension : Parse the sequence_scalable_extension         *
1101  *                             structure to handle scalable coding           *
1102  *****************************************************************************/
1103
1104 static void SequenceScalableExtension( vpar_thread_t * p_vpar )
1105 {
1106     /* We don't care about anything scalable except the scalable mode. */
1107     switch( p_vpar->sequence.i_scalable_mode = GetBits( &p_vpar->bit_stream, 2 ) )
1108     /* The length of the structure depends on the value of the scalable_mode */
1109     {
1110         case 1:
1111             RemoveBits32( &p_vpar->bit_stream );
1112             RemoveBits( &p_vpar->bit_stream, 21 );
1113             break;
1114         case 2:
1115             RemoveBits( &p_vpar->bit_stream, 12 );
1116             break;
1117         default:
1118             RemoveBits( &p_vpar->bit_stream, 4 );
1119     }
1120
1121 }
1122 /*****************************************************************************
1123  * PictureDisplayExtension : Parse the picture_display_extension structure   *
1124  *****************************************************************************/
1125
1126 static void PictureDisplayExtension( vpar_thread_t * p_vpar )
1127 {
1128     /* Number of frame center offset */
1129     int i_nb, i_dummy;
1130     /* I am not sure it works but it should
1131         (fewer tests than shown in §6.3.12) */
1132     i_nb = p_vpar->sequence.b_progressive ? p_vpar->sequence.b_progressive +
1133                                             p_vpar->picture.b_repeat_first_field +
1134                                             p_vpar->picture.b_top_field_first
1135                            : ( p_vpar->picture.b_frame_structure + 1 ) +
1136                              p_vpar->picture.b_repeat_first_field;
1137     for( i_dummy = 0; i_dummy < i_nb; i_dummy++ )
1138     {
1139         RemoveBits( &p_vpar->bit_stream, 17 );
1140         RemoveBits( &p_vpar->bit_stream, 17 );
1141     }
1142 }
1143
1144
1145 /*****************************************************************************
1146  * PictureSpatialScalableExtension                                           *
1147  *****************************************************************************/
1148
1149 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar )
1150 {
1151     /* That's scalable, so we trash it */
1152     RemoveBits32( &p_vpar->bit_stream );
1153     RemoveBits( &p_vpar->bit_stream, 16 );
1154 }
1155
1156
1157 /*****************************************************************************
1158  * PictureTemporalScalableExtension                                          *
1159  *****************************************************************************/
1160
1161 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar )
1162 {
1163     /* Scalable again, trashed again */
1164     RemoveBits( &p_vpar->bit_stream, 23 );
1165 }
1166
1167
1168 /*****************************************************************************
1169  * CopyrightExtension : Keeps some legal informations                        *
1170  *****************************************************************************/
1171
1172 static void CopyrightExtension( vpar_thread_t * p_vpar )
1173 {
1174     u32     i_copyright_nb_1, i_copyright_nb_2; /* local integers */
1175     p_vpar->sequence.b_copyright_flag = GetBits( &p_vpar->bit_stream, 1 );
1176         /* A flag that says whether the copyright information is significant */
1177     p_vpar->sequence.i_copyright_id = GetBits( &p_vpar->bit_stream, 8 );
1178         /* An identifier compliant with ISO/CEI JTC 1/SC 29 */
1179     p_vpar->sequence.b_original = GetBits( &p_vpar->bit_stream, 1 );
1180         /* Reserved bits */
1181     RemoveBits( &p_vpar->bit_stream, 8 );
1182         /* The copyright_number is split in three parts */
1183         /* first part */
1184     i_copyright_nb_1 = GetBits( &p_vpar->bit_stream, 20 );
1185     RemoveBits( &p_vpar->bit_stream, 1 );
1186         /* second part */
1187     i_copyright_nb_2 = GetBits( &p_vpar->bit_stream, 22 );
1188     RemoveBits( &p_vpar->bit_stream, 1 );
1189         /* third part and sum */
1190     p_vpar->sequence.i_copyright_nb = ( (u64)i_copyright_nb_1 << 44 ) |
1191                                       ( (u64)i_copyright_nb_2 << 22 ) |
1192                                       ( (u64)GetBits( &p_vpar->bit_stream, 22 ) );
1193 }