git.sesse.net Git - vlc/blob - src/video_parser/vpar_headers.c

   1 /*****************************************************************************
   2  * vpar_headers.c : headers parsing
   3  * (c)1999 VideoLAN
   4  *****************************************************************************/
   5
   6 /*****************************************************************************
   7  * Preamble
   8  *****************************************************************************/
   9 #include <errno.h>
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12 #include <unistd.h>
  13 #include <string.h>
  14 #include <sys/uio.h>
  15 #include <X11/Xlib.h>
  16 #include <X11/extensions/XShm.h>
  17
  18 #include "config.h"
  19 #include "common.h"
  20 #include "mtime.h"
  21 #include "vlc_thread.h"
  22
  23 #include "intf_msg.h"
  24 #include "debug.h"                    /* ?? temporaire, requis par netlist.h */
  25
  26 #include "input.h"
  27 #include "input_netlist.h"
  28 #include "decoder_fifo.h"
  29 #include "video.h"
  30 #include "video_output.h"
  31
  32 #include "vdec_idct.h"
  33 #include "video_decoder.h"
  34 #include "vdec_motion.h"
  35
  36 #include "vpar_blocks.h"
  37 #include "vpar_headers.h"
  38 #include "video_fifo.h"
  39 #include "vpar_synchro.h"
  40 #include "video_parser.h"
  41
  42 /*
  43  * Local prototypes
  44  */
  45 static __inline__ void NextStartCode( vpar_thread_t * p_vpar );
  46 static void SequenceHeader( vpar_thread_t * p_vpar );
  47 static void GroupHeader( vpar_thread_t * p_vpar );
  48 static void PictureHeader( vpar_thread_t * p_vpar );
  49 static void __inline__ ReferenceUpdate( vpar_thread_t * p_vpar,
  50                                         int i_coding_type,
  51                                         picture_t * p_newref );
  52 static void __inline__ ReferenceReplace( vpar_thread_t * p_vpar,
  53                                          int i_coding_type,
  54                                          picture_t * p_newref );
  55 static void SliceHeader00( vpar_thread_t * p_vpar,
  56                            int * pi_mb_address, int i_mb_base,
  57                            u32 i_vert_code );
  58 static void SliceHeader01( vpar_thread_t * p_vpar,
  59                            int * pi_mb_address, int i_mb_base,
  60                            u32 i_vert_code );
  61 static void SliceHeader10( vpar_thread_t * p_vpar,
  62                            int * pi_mb_address, int i_mb_base,
  63                            u32 i_vert_code );
  64 static void SliceHeader11( vpar_thread_t * p_vpar,
  65                            int * pi_mb_address, int i_mb_base,
  66                            u32 i_vert_code );
  67 static __inline__ void SliceHeader( vpar_thread_t * p_vpar,
  68                                     int * pi_mb_address, int i_mb_base,
  69                                     u32 i_vert_code );
  70 static void ExtensionAndUserData( vpar_thread_t * p_vpar );
  71 static void QuantMatrixExtension( vpar_thread_t * p_vpar );
  72 static void SequenceScalableExtension( vpar_thread_t * p_vpar );
  73 static void SequenceDisplayExtension( vpar_thread_t * p_vpar );
  74 static void PictureDisplayExtension( vpar_thread_t * p_vpar );
  75 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar );
  76 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar );
  77 static void CopyrightExtension( vpar_thread_t * p_vpar );
  78 static __inline__ void LoadMatrix( vpar_thread_t * p_vpar, quant_matrix_t * p_matrix );
  79 static __inline__ void LinkMatrix( quant_matrix_t * p_matrix, int * pi_array );
  80
  81 /*****************************************************************************
  82  * vpar_NextSequenceHeader : Find the next sequence header
  83  *****************************************************************************/
  84 int vpar_NextSequenceHeader( vpar_thread_t * p_vpar )
  85 {
  86     while( !p_vpar->b_die )
  87     {
  88         NextStartCode( p_vpar );
  89         if( ShowBits( &p_vpar->bit_stream, 32 ) == SEQUENCE_HEADER_CODE )
  90             return 0;
  91     }
  92     return 1;
  93 }
  94
  95 /*****************************************************************************
  96  * vpar_ParseHeader : Parse the next header
  97  *****************************************************************************/
  98 int vpar_ParseHeader( vpar_thread_t * p_vpar )
  99 {
 100     while( !p_vpar->b_die )
 101     {
 102         NextStartCode( p_vpar );
 103         switch( GetBits32( &p_vpar->bit_stream ) )
 104         {
 105         case SEQUENCE_HEADER_CODE:
 106             SequenceHeader( p_vpar );
 107             return 0;
 108             break;
 109
 110         case GROUP_START_CODE:
 111             GroupHeader( p_vpar );
 112             return 0;
 113             break;
 114
 115         case PICTURE_START_CODE:
 116             PictureHeader( p_vpar );
 117             return 0;
 118             break;
 119
 120         case SEQUENCE_END_CODE:
 121             return 1;
 122             break;
 123
 124         default:
 125         }
 126     }
 127
 128     return 0;
 129 }
 130
 131 /*
 132  * Following functions are local
 133  */
 134
 135 /*****************************************************************************
 136  * NextStartCode : Find the next start code
 137  *****************************************************************************/
 138 static __inline__ void NextStartCode( vpar_thread_t * p_vpar )
 139 {
 140     /* Re-align the buffer on an 8-bit boundary */
 141     RealignBits( &p_vpar->bit_stream );
 142
 143     while( ShowBits( &p_vpar->bit_stream, 24 ) != 0x01L && !p_vpar->b_die )
 144     {
 145         DumpBits( &p_vpar->bit_stream, 8 );
 146     }
 147 }
 148
 149 /*****************************************************************************
 150  * SequenceHeader : Parse the next sequence header
 151  *****************************************************************************/
 152 static void SequenceHeader( vpar_thread_t * p_vpar )
 153 {
 154 #define RESERVED    -1
 155     static double d_frame_rate_table[16] =
 156     {
 157         0.0,
 158         ((23.0*1000.0)/1001.0),
 159         24.0,
 160         25.0,
 161         ((30.0*1000.0)/1001.0),
 162         30.0,
 163         50.0,
 164         ((60.0*1000.0)/1001.0),
 165         60.0,
 166         RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED
 167     };
 168 #undef RESERVED
 169
 170     int i_height_save, i_width_save;
 171
 172     i_height_save = p_vpar->sequence.i_height;
 173     i_width_save = p_vpar->sequence.i_width;
 174
 175     p_vpar->sequence.i_height = GetBits( &p_vpar->bit_stream, 12 );
 176     p_vpar->sequence.i_width = GetBits( &p_vpar->bit_stream, 12 );
 177     p_vpar->sequence.i_aspect_ratio = GetBits( &p_vpar->bit_stream, 4 );
 178     p_vpar->sequence.d_frame_rate =
 179             d_frame_rate_table[ GetBits( &p_vpar->bit_stream, 4 ) ];
 180
 181     /* We don't need bit_rate_value, marker_bit, vbv_buffer_size,
 182      * constrained_parameters_flag */
 183     DumpBits( &p_vpar->bit_stream, 30 );
 184
 185     /*
 186      * Quantization matrices
 187      */
 188     if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_intra_quantizer_matrix */
 189     {
 190         LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
 191     }
 192     else
 193     {
 194         /* Use default matrix. */
 195         LinkMatrix( &p_vpar->sequence.intra_quant, pi_default_intra_quant );
 196     }
 197
 198     if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_non_intra_quantizer_matrix */
 199     {
 200         LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
 201     }
 202     else
 203     {
 204         /* Use default matrix. */
 205         LinkMatrix( &p_vpar->sequence.nonintra_quant, pi_default_nonintra_quant );
 206     }
 207
 208     /* Unless later overwritten by a matrix extension, we have the same
 209      * matrices for luminance and chrominance. */
 210     LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 211                 p_vpar->sequence.intra_quant.pi_matrix );
 212     LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
 213                 p_vpar->sequence.nonintra_quant.pi_matrix );
 214
 215     /*
 216      * Sequence Extension
 217      */
 218     NextStartCode( p_vpar );
 219     if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
 220     {
 221         int                         i_dummy;
 222         static int                  pi_chroma_nb_blocks[4] = {0, 1, 2, 4};
 223         static f_chroma_pattern_t   ppf_chroma_pattern[4] =
 224                             {NULL, vpar_CodedPattern420,
 225                              vpar_CodedPattern422, vpar_CodedPattern444};
 226
 227         /* Parse sequence_extension */
 228         DumpBits32( &p_vpar->bit_stream );
 229         /* extension_start_code_identifier, profile_and_level_indication */
 230         DumpBits( &p_vpar->bit_stream, 12 );
 231         p_vpar->sequence.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
 232         p_vpar->sequence.i_chroma_format = GetBits( &p_vpar->bit_stream, 2 );
 233         p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width
 234                     >> (3-p_vpar->sequence.i_chroma_format);
 235         p_vpar->sequence.i_chroma_nb_blocks = pi_chroma_nb_blocks
 236                                     [p_vpar->sequence.i_chroma_format];
 237         p_vpar->sequence.pf_decode_pattern = ppf_chroma_pattern
 238                                     [p_vpar->sequence.i_chroma_format];
 239         p_vpar->sequence.i_width |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
 240         p_vpar->sequence.i_height |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
 241         /* bit_rate_extension, marker_bit, vbv_buffer_size_extension, low_delay */
 242         DumpBits( &p_vpar->bit_stream, 22 );
 243         /* frame_rate_extension_n */
 244         i_dummy = GetBits( &p_vpar->bit_stream, 2 );
 245         /* frame_rate_extension_d */
 246         p_vpar->sequence.d_frame_rate *= (i_dummy + 1)
 247                                   / (GetBits( &p_vpar->bit_stream, 5 ) + 1);
 248
 249         p_vpar->sequence.pf_decode_mv = vpar_MPEG2MotionVector;
 250     }
 251     else
 252     {
 253         /* It's an MPEG-1 stream. Put adequate parameters. */
 254         p_vpar->sequence.b_progressive = 1;
 255         p_vpar->sequence.i_chroma_format = CHROMA_420;
 256         p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width >> 2;
 257         p_vpar->sequence.i_chroma_nb_blocks = 2;
 258         p_vpar->sequence.pf_decode_pattern = vpar_CodedPattern420;
 259
 260         p_vpar->sequence.pf_decode_mv = vpar_MPEG1MotionVector;
 261     }
 262
 263     p_vpar->sequence.i_mb_width = (p_vpar->sequence.i_width + 15) / 16;
 264     p_vpar->sequence.i_mb_height = (p_vpar->sequence.b_progressive) ?
 265                                    (p_vpar->sequence.i_height + 15) / 16 :
 266                                    2 * (p_vpar->sequence.i_height + 31) / 32;
 267     p_vpar->sequence.i_mb_size = p_vpar->sequence.i_mb_width
 268                                         * p_vpar->sequence.i_mb_height;
 269     p_vpar->sequence.i_width = (p_vpar->sequence.i_mb_width * 16);
 270     p_vpar->sequence.i_height = (p_vpar->sequence.i_mb_height * 16);
 271     p_vpar->sequence.i_size = p_vpar->sequence.i_width
 272                                         * p_vpar->sequence.i_height;
 273
 274     /* Slice Header functions */
 275     if( p_vpar->sequence.i_height <= 2800 )
 276     {
 277         if( p_vpar->sequence.i_scalable_mode != SC_DP )
 278         {
 279             p_vpar->sequence.pf_slice_header = SliceHeader00;
 280         }
 281         else
 282         {
 283             p_vpar->sequence.pf_slice_header = SliceHeader01;
 284         }
 285     }
 286     else
 287     {
 288         if( p_vpar->sequence.i_scalable_mode != SC_DP )
 289         {
 290             p_vpar->sequence.pf_slice_header = SliceHeader10;
 291         }
 292         else
 293         {
 294             p_vpar->sequence.pf_slice_header = SliceHeader11;
 295         }
 296     }
 297
 298     if(    p_vpar->sequence.i_width != i_width_save
 299         || p_vpar->sequence.i_height != i_height_save )
 300     {
 301          /* What do we do in case of a size change ??? */
 302     }
 303
 304     /* Extension and User data */
 305     ExtensionAndUserData( p_vpar );
 306 }
 307
 308 /*****************************************************************************
 309  * GroupHeader : Parse the next group of pictures header
 310  *****************************************************************************/
 311 static void GroupHeader( vpar_thread_t * p_vpar )
 312 {
 313     /* Nothing to do, we don't care. */
 314     DumpBits( &p_vpar->bit_stream, 27 );
 315     ExtensionAndUserData( p_vpar );
 316 }
 317
 318 /*****************************************************************************
 319  * PictureHeader : Parse the next picture header
 320  *****************************************************************************/
 321 static void PictureHeader( vpar_thread_t * p_vpar )
 322 {
 323     static f_macroblock_type_t ppf_macroblock_type[4] =
 324                                                  {vpar_IMBType, vpar_PMBType,
 325                                                   vpar_BMBType, vpar_DMBType};
 326
 327     int                 i_structure;
 328     int                 i_mb_address, i_mb_base, i_mb;
 329     elem_t *            p_y, p_u, p_v;
 330     boolean_t           b_parsable;
 331     u32                 i_dummy;
 332
 333     DumpBits( &p_vpar->bit_stream, 10 ); /* temporal_reference */
 334     p_vpar->picture.i_coding_type = GetBits( &p_vpar->bit_stream, 3 );
 335     p_vpar->picture.pf_macroblock_type = ppf_macroblock_type
 336                                          [p_vpar->picture.i_coding_type];
 337
 338     DumpBits( &p_vpar->bit_stream, 16 ); /* vbv_delay */
 339
 340     p_vpar->picture.b_full_pel_forward_vector = GetBits( &p_vpar->bit_stream, 1 );
 341     p_vpar->picture.i_forward_f_code = GetBits( &p_vpar->bit_stream, 3 );
 342     p_vpar->picture.b_full_pel_backward_vector = GetBits( &p_vpar->bit_stream, 1 );
 343     p_vpar->picture.i_backward_f_code = GetBits( &p_vpar->bit_stream, 3 );
 344
 345     /* extra_information_picture */
 346     while( GetBits( &p_vpar->bit_stream, 1 ) )
 347     {
 348         DumpBits( &p_vpar->bit_stream, 8 );
 349     }
 350
 351     /*
 352      * Picture Coding Extension
 353      */
 354     NextStartCode( p_vpar );
 355     if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
 356     {
 357         /* Parse picture_coding_extension */
 358         DumpBits32( &p_vpar->bit_stream );
 359         /* extension_start_code_identifier */
 360         DumpBits( &p_vpar->bit_stream, 4 );
 361
 362         p_vpar->picture.ppi_f_code[0][0] = GetBits( &p_vpar->bit_stream, 4 );
 363         p_vpar->picture.ppi_f_code[0][1] = GetBits( &p_vpar->bit_stream, 4 );
 364         p_vpar->picture.ppi_f_code[1][0] = GetBits( &p_vpar->bit_stream, 4 );
 365         p_vpar->picture.ppi_f_code[1][1] = GetBits( &p_vpar->bit_stream, 4 );
 366         p_vpar->picture.i_intra_dc_precision = GetBits( &p_vpar->bit_stream, 2 );
 367         i_structure = GetBits( &p_vpar->bit_stream, 2 );
 368         p_vpar->picture.b_top_field_first = GetBits( &p_vpar->bit_stream, 1 );
 369         p_vpar->picture.b_frame_pred_frame_dct
 370              = GetBits( &p_vpar->bit_stream, 1 );
 371         p_vpar->picture.b_concealment_mv = GetBits( &p_vpar->bit_stream, 1 );
 372         p_vpar->picture.b_q_scale_type = GetBits( &p_vpar->bit_stream, 1 );
 373         p_vpar->picture.b_intra_vlc_format = GetBits( &p_vpar->bit_stream, 1 );
 374         p_vpar->picture.b_alternate_scan = GetBits( &p_vpar->bit_stream, 1 );
 375         p_vpar->picture.b_repeat_first_field = GetBits( &p_vpar->bit_stream, 1 );
 376         /* repeat_first_field (ISO/IEC 13818-2 6.3.10 is necessary to know
 377          * the length of the picture_display_extension structure.
 378          * chroma_420_type (obsolete) */
 379         DumpBits( &p_vpar->bit_stream, 1 );
 380         p_vpar->picture.b_progressive_frame = GetBits( &p_vpar->bit_stream, 1 );
 381
 382         /* composite_display_flag */
 383         if( GetBits( &p_vpar->bit_stream, 1 ) )
 384         {
 385             /* v_axis, field_sequence, sub_carrier, burst_amplitude,
 386              * sub_carrier_phase */
 387             DumpBits( &p_vpar->bit_stream, 20 );
 388         }
 389     }
 390     else
 391     {
 392         /* MPEG-1 compatibility flags */
 393         p_vpar->picture.i_intra_dc_precision = 0; /* 8 bits */
 394         i_structure = FRAME_STRUCTURE;
 395         p_vpar->picture.b_frame_pred_frame_dct = 1;
 396         p_vpar->picture.b_concealment_mv = 0;
 397         p_vpar->picture.b_q_scale_type = 0;
 398         p_vpar->picture.b_intra_vlc_format = 0;
 399         p_vpar->picture.b_alternate_scan = 0; /* zigzag */
 400         p_vpar->picture.b_repeat_first_field = 0;
 401         p_vpar->picture.b_progressive_frame = 1;
 402     }
 403
 404     if( p_vpar->picture.i_current_structure &&
 405         (i_structure == FRAME_STRUCTURE ||
 406          i_structure == p_vpar->picture.i_current_structure) )
 407     {
 408         /* We don't have the second field of the buffered frame. */
 409         if( p_vpar->picture.p_picture != NULL )
 410         {
 411             ReferenceReplace( p_vpar,
 412                       p_vpar->picture.i_coding_type,
 413                       NULL );
 414
 415             for( i_mb = 0; i_mb < p_vpar->sequence.i_mb_size >> 1; i_mb++ )
 416             {
 417                 vpar_DestroyMacroblock( &p_vpar->vfifo,
 418                                         p_vpar->picture.pp_mb[i_mb] );
 419             }
 420             vout_DestroyPicture( p_vpar->p_vout, p_vpar->picture.p_picture );
 421         }
 422
 423         p_vpar->picture.i_current_structure = 0;
 424
 425         intf_DbgMsg("vpar debug: odd number of field picture.");
 426     }
 427
 428     if( p_vpar->picture.i_current_structure )
 429     {
 430         /* Second field of a frame. We will decode it if, and only if we
 431          * have decoded the first frame. */
 432         b_parsable = (p_vpar->picture.p_picture != NULL);
 433     }
 434     else
 435     {
 436         /* Do we have the reference pictures ? */
 437         b_parsable = !((p_vpar->picture.i_coding_type == P_CODING_TYPE) &&
 438                        (p_vpar->sequence.p_forward == NULL)) ||
 439                       ((p_vpar->picture.i_coding_type == B_CODING_TYPE) &&
 440                        (p_vpar->sequence.p_forward == NULL ||
 441                         p_vpar->sequence.p_backward == NULL));
 442
 443         if( b_parsable )
 444         {
 445             /* Does synchro say we have enough time to decode it ? */
 446             b_parsable = vpar_SynchroChoose( p_vpar,
 447                                p_vpar->picture.i_coding_type, i_structure );
 448         }
 449     }
 450
 451     if( !b_parsable )
 452     {
 453         /* Update the reference pointers. */
 454         ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, NULL );
 455
 456         /* Warn Synchro we have trashed a picture. */
 457         vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
 458
 459         /* Update context. */
 460         if( i_structure != FRAME_STRUCTURE )
 461             p_vpar->picture.i_current_structure = i_structure;
 462         p_vpar->picture.p_picture = NULL;
 463
 464         return;
 465     }
 466
 467     /* OK, now we are sure we will decode the picture. */
 468 #define P_picture p_vpar->picture.p_picture
 469     p_vpar->picture.b_error = 0;
 470
 471     if( !p_vpar->picture.i_current_structure )
 472     {
 473         /* This is a new frame. Get a structure from the video_output. */
 474         P_picture = vout_CreatePicture( p_vpar->p_vout,
 475                                         SPLITTED_YUV_PICTURE,
 476                                         p_vpar->sequence.i_width,
 477                                         p_vpar->sequence.i_height,
 478                                         p_vpar->sequence.i_chroma_format );
 479
 480         /* Initialize values. */
 481         P_picture->date = vpar_SynchroDecode( p_vpar,
 482                                               p_vpar->picture.i_coding_type,
 483                                               i_structure );
 484         p_vpar->picture.i_lum_incr = - 8 + ( p_vpar->sequence.i_width
 485                     << ( i_structure != FRAME_STRUCTURE ) );
 486         p_vpar->picture.i_chroma_incr = -8 + ( p_vpar->sequence.i_width
 487                     << (( i_structure != FRAME_STRUCTURE ) +
 488                         ( 3 - p_vpar->sequence.i_chroma_format )) );
 489
 490         /* Update the reference pointers. */
 491         ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, P_picture );
 492     }
 493     p_vpar->picture.i_current_structure |= i_structure;
 494     p_vpar->picture.i_structure = i_structure;
 495     p_vpar->picture.b_frame_structure = (i_structure == FRAME_STRUCTURE);
 496
 497     /* Initialize picture data for decoding. */
 498     if( i_structure == BOTTOM_FIELD )
 499     {
 500         i_mb_base = p_vpar->sequence.i_mb_size >> 1;
 501     }
 502     else
 503     {
 504         i_mb_base = 0;
 505     }
 506     i_mb_address = 0;
 507
 508     /* Extension and User data. */
 509     ExtensionAndUserData( p_vpar );
 510
 511     /* Picture data (ISO/IEC 13818-2 6.2.3.7). */
 512     NextStartCode( p_vpar );
 513     while( i_mb_address+i_mb_base < p_vpar->sequence.i_mb_size
 514            && !p_vpar->picture.b_error)
 515     {
 516         if( ((i_dummy = ShowBits( &p_vpar->bit_stream, 32 ))
 517                  < SLICE_START_CODE_MIN) ||
 518             (i_dummy > SLICE_START_CODE_MAX) )
 519         {
 520             intf_DbgMsg("vpar debug: premature end of picture");
 521             p_vpar->picture.b_error = 1;
 522             break;
 523         }
 524         DumpBits32( &p_vpar->bit_stream );
 525
 526         /* Decode slice data. */
 527         SliceHeader( p_vpar, &i_mb_address, i_mb_base, i_dummy & 255 );
 528     }
 529
 530     if( p_vpar->picture.b_error )
 531     {
 532         /* Trash picture. */
 533         for( i_mb = 0; p_vpar->picture.pp_mb[i_mb]; i_mb++ )
 534         {
 535             vpar_DestroyMacroblock( &p_vpar->vfifo, p_vpar->picture.pp_mb[i_mb] );
 536         }
 537
 538         ReferenceReplace( p_vpar, p_vpar->picture.i_coding_type, NULL );
 539         vout_DestroyPicture( p_vpar->p_vout, P_picture );
 540
 541         /* Prepare context for the next picture. */
 542         P_picture = NULL;
 543     }
 544     else if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
 545     {
 546         /* Frame completely parsed. */
 547         P_picture.i_deccount = p_vpar->sequence.i_mb_size;
 548         for( i_mb = 0; i_mb < p_vpar->sequence.i_mb_size; i_mb++ )
 549         {
 550             vpar_DecodeMacroblock( &p_vpar->vfifo, p_vpar->picture.pp_mb[i_mb] );
 551         }
 552
 553         /* Prepare context for the next picture. */
 554         P_picture = NULL;
 555     }
 556 #undef P_picture
 557 }
 558
 559 /*****************************************************************************
 560  * ReferenceUpdate : Update the reference pointers when we have a new picture
 561  *****************************************************************************/
 562 static void __inline__ ReferenceUpdate( vpar_thread_t * p_vpar,
 563                                         int i_coding_type,
 564                                         picture_t * p_newref )
 565 {
 566     if( i_coding_type != B_CODING_TYPE )
 567     {
 568         if( p_vpar->sequence.p_forward != NULL )
 569             vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_forward );
 570         p_vpar->sequence.p_forward = p_vpar->sequence.p_backward;
 571         p_vpar->sequence.p_backward = p_newref;
 572         if( p_newref != NULL )
 573             vout_LinkPicture( p_vpar->p_vout, p_newref );
 574     }
 575 }
 576
 577 /*****************************************************************************
 578  * ReferenceReplace : Replace the last reference pointer when we destroy
 579  * a picture
 580  *****************************************************************************/
 581 static void __inline__ ReferenceReplace( vpar_thread_t * p_vpar,
 582                                          int i_coding_type,
 583                                          picture_t * p_newref )
 584 {
 585     if( i_coding_type != B_CODING_TYPE )
 586     {
 587         if( p_vpar->sequence.p_backward != NULL )
 588             vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_backward );
 589         p_vpar->sequence.p_backward = p_newref;
 590         if( p_newref != NULL )
 591             vout_LinkPicture( p_vpar->p_vout, p_newref );
 592     }
 593 }
 594
 595 /*****************************************************************************
 596  * SliceHeaderXY : Parse the next slice structure
 597  *****************************************************************************
 598  * X = i_height > 2800 ?
 599  * Y = scalable_mode == SC_DP ?
 600  *****************************************************************************/
 601 static void SliceHeader00( vpar_thread_t * p_vpar,
 602                            int * pi_mb_address, int i_mb_base,
 603                            u32 i_vert_code )
 604 {
 605     SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
 606 }
 607
 608 static void SliceHeader01( vpar_thread_t * p_vpar,
 609                            int * pi_mb_address, int i_mb_base,
 610                            u32 i_vert_code )
 611 {
 612     DumpBits( &p_vpar->bit_stream, 7 ); /* priority_breakpoint */
 613     SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
 614 }
 615
 616 static void SliceHeader10( vpar_thread_t * p_vpar,
 617                            int * pi_mb_address, int i_mb_base,
 618                            u32 i_vert_code )
 619 {
 620     i_vert_code += GetBits( &p_vpar->bit_stream, 3 ) << 7;
 621     SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
 622 }
 623
 624 static void SliceHeader11( vpar_thread_t * p_vpar,
 625                            int * pi_mb_address, int i_mb_base,
 626                            u32 i_vert_code )
 627 {
 628     i_vert_code += GetBits( &p_vpar->bit_stream, 3 ) << 7;
 629     DumpBits( &p_vpar->bit_stream, 7 ); /* priority_breakpoint */
 630     SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
 631 }
 632
 633 /*****************************************************************************
 634  * SliceHeader : Parse the next slice structure
 635  *****************************************************************************/
 636 static __inline__ void SliceHeader( vpar_thread_t * p_vpar,
 637                                     int * pi_mb_address, int i_mb_base,
 638                                     u32 i_vert_code )
 639 {
 640     /* DC predictors initialization table */
 641     static int              pi_dc_dct_reinit[4] = {128,256,512,1024};
 642
 643     int                     i_mb_address_save = *pi_mb_address;
 644
 645     /* slice_vertical_position_extension and priority_breakpoint already done */
 646     LoadQuantizerScale( p_vpar );
 647
 648     if( GetBits( &p_vpar->bit_stream, 1 ) )
 649     {
 650         /* intra_slice, slice_id */
 651         DumpBits( &p_vpar->bit_stream, 8 );
 652         /* extra_information_slice */
 653         while( GetBits( &p_vpar->bit_stream, 1 ) )
 654         {
 655             DumpBits( &p_vpar->bit_stream, 8 );
 656         }
 657     }
 658
 659     *pi_mb_address = (i_vert_code - 1)*p_vpar->sequence.i_mb_width;
 660
 661     /* Reset DC coefficients predictors (ISO/IEC 13818-2 7.2.1). Why
 662      * does the reference decoder put 0 instead of the normative values ? */
 663     p_vpar->slice.pi_dc_dct_pred[0] = p_vpar->slice.pi_dc_dct_pred[1]
 664         = p_vpar->slice.pi_dc_dct_pred[2]
 665         = pi_dc_dct_reinit[p_vpar->picture.i_intra_dc_precision];
 666
 667     /* Reset motion vector predictors (ISO/IEC 13818-2 7.6.3.4). */
 668     bzero( p_vpar->slice.pppi_pmv, 8*sizeof(int) );
 669
 670     do
 671     {
 672         vpar_ParseMacroblock( p_vpar, pi_mb_address, i_mb_address_save,
 673                               i_mb_base );
 674         i_mb_address_save = *pi_mb_address;
 675     }
 676     while( !ShowBits( &p_vpar->bit_stream, 23 ) );
 677 }
 678
 679 /*****************************************************************************
 680  * ExtensionAndUserData : Parse the extension_and_user_data structure
 681  *****************************************************************************/
 682 static void ExtensionAndUserData( vpar_thread_t * p_vpar )
 683 {
 684     while( !p_vpar->b_die )
 685     {
 686         NextStartCode( p_vpar );
 687         switch( ShowBits( &p_vpar->bit_stream, 32 ) )
 688         {
 689         case EXTENSION_START_CODE:
 690             DumpBits32( &p_vpar->bit_stream );
 691             switch( GetBits( &p_vpar->bit_stream, 4 ) )
 692             {
 693             case SEQUENCE_DISPLAY_EXTENSION_ID:
 694                 SequenceDisplayExtension( p_vpar );
 695                 break;
 696             case QUANT_MATRIX_EXTENSION_ID:
 697                 QuantMatrixExtension( p_vpar );
 698                 break;
 699             case SEQUENCE_SCALABLE_EXTENSION_ID:
 700                 SequenceScalableExtension( p_vpar );
 701                 break;
 702             case PICTURE_DISPLAY_EXTENSION_ID:
 703                 PictureDisplayExtension( p_vpar );
 704                 break;
 705             case PICTURE_SPATIAL_SCALABLE_EXTENSION_ID:
 706                 PictureSpatialScalableExtension( p_vpar );
 707                 break;
 708             case PICTURE_TEMPORAL_SCALABLE_EXTENSION_ID:
 709                 PictureTemporalScalableExtension( p_vpar );
 710                 break;
 711             case COPYRIGHT_EXTENSION_ID:
 712                 CopyrightExtension( p_vpar );
 713                 break;
 714             default:
 715             }
 716             break;
 717
 718         case USER_DATA_START_CODE:
 719             DumpBits32( &p_vpar->bit_stream );
 720             /* Wait for the next start code */
 721             break;
 722
 723         default:
 724             return;
 725         }
 726     }
 727 }
 728
 729
 730 /*****************************************************************************
 731  * SequenceDisplayExtension : Parse the sequence_display_extension structure *
 732  *****************************************************************************/
 733
 734 static void SequenceDisplayExtension( vpar_thread_t * p_vpar )
 735 {
 736     /* We don't care sequence_display_extension. */
 737     /* video_format */
 738     DumpBits( &p_vpar->bit_stream, 3 );
 739     if( GetBits( &p_vpar->bit_stream, 1 ) )
 740     {
 741         /* Three bytes for color_desciption */
 742         DumpBits( &p_vpar->bit_stream, 24 );
 743     }
 744     /* display_horizontal and vertical_size and a marker_bit */
 745     DumpBits( &p_vpar->bit_stream, 29 );
 746 }
 747
 748
 749 /*****************************************************************************
 750  * QuantMatrixExtension : Load quantization matrices for luminance           *
 751  *                        and chrominance                                    *
 752  *****************************************************************************/
 753
 754 static void QuantMatrixExtension( vpar_thread_t * p_vpar )
 755 {
 756     if( GetBits( &p_vpar->bit_stream, 1 ) )
 757     {
 758         /* Load intra_quantiser_matrix for luminance. */
 759         LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
 760     }
 761     else
 762     {
 763         /* Use the default matrix. */
 764         LinkMatrix( &p_vpar->sequence.intra_quant,
 765                     pi_default_intra_quant );
 766     }
 767     if( GetBits( &p_vpar->bit_stream, 1 ) )
 768     {
 769         /* Load non_intra_quantiser_matrix for luminance. */
 770         LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
 771     }
 772     else
 773     {
 774         /* Use the default matrix. */
 775         LinkMatrix( &p_vpar->sequence.nonintra_quant,
 776                     pi_default_nonintra_quant );
 777     }
 778     if( GetBits( &p_vpar->bit_stream, 1 ) )
 779     {
 780         /* Load intra_quantiser_matrix for chrominance. */
 781         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_intra_quant );
 782     }
 783     else
 784     {
 785         /* Link the chrominance intra matrix to the luminance one. */
 786         LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 787                     p_vpar->sequence.intra_quant.pi_matrix );
 788     }
 789     if( GetBits( &p_vpar->bit_stream, 1 ) )
 790     {
 791         /* Load non_intra_quantiser_matrix for chrominance. */
 792         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
 793     }
 794     else
 795     {
 796         /* Link the chrominance intra matrix to the luminance one. */
 797         LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 798                     p_vpar->sequence.intra_quant.pi_matrix );
 799     }
 800     if( GetBits( &p_vpar->bit_stream, 1 ) )
 801     {
 802         /* Load non_intra_quantiser_matrix for chrominance. */
 803         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
 804     }
 805     else
 806     {
 807         /* Link the chrominance nonintra matrix to the luminance one. */
 808         LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
 809                     p_vpar->sequence.nonintra_quant.pi_matrix );
 810     }
 811 }
 812
 813
 814 /*****************************************************************************
 815  * SequenceScalableExtension : Parse the sequence_scalable_extension         *
 816  *                             structure to handle scalable coding           *
 817  *****************************************************************************/
 818
 819 static void SequenceScalableExtension( vpar_thread_t * p_vpar )
 820 {
 821     /* We don't care about anything scalable except the scalable mode. */
 822     switch( p_vpar->sequence.i_scalable_mode = GetBits( &p_vpar->bit_stream, 2 ) )
 823     /* The length of the structure depends on the value of the scalable_mode */
 824     {
 825         case 1:
 826             DumpBits32( &p_vpar->bit_stream );
 827             DumpBits( &p_vpar->bit_stream, 21 );
 828             break;
 829         case 2:
 830             DumpBits( &p_vpar->bit_stream, 12 );
 831             break;
 832         default:
 833             DumpBits( &p_vpar->bit_stream, 4 );
 834     }
 835
 836 }
 837 /*****************************************************************************
 838  * PictureDisplayExtension : Parse the picture_display_extension structure   *
 839  *****************************************************************************/
 840
 841 static void PictureDisplayExtension( vpar_thread_t * p_vpar )
 842 {
 843     /* Number of frame center offset */
 844     int nb;
 845     /* I am not sure it works but it should
 846         (fewer tests than shown in §6.3.12) */
 847     nb = p_vpar->sequence.b_progressive ? p_vpar->sequence.b_progressive +
 848                                           p_vpar->picture.b_repeat_first_field +
 849                                           p_vpar->picture.b_top_field_first
 850                          : ( p_vpar->picture.b_frame_structure + 1 ) +
 851                            p_vpar->picture.b_repeat_first_field;
 852     DumpBits( &p_vpar->bit_stream, 34 * nb );
 853 }
 854
 855
 856 /*****************************************************************************
 857  * PictureSpatialScalableExtension                                           *
 858  *****************************************************************************/
 859
 860 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar )
 861 {
 862     /* That's scalable, so we trash it */
 863     DumpBits32( &p_vpar->bit_stream );
 864     DumpBits( &p_vpar->bit_stream, 14 );
 865 }
 866
 867
 868 /*****************************************************************************
 869  * PictureTemporalScalableExtension                                          *
 870  *****************************************************************************/
 871
 872 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar )
 873 {
 874     /* Scalable again, trashed again */
 875     DumpBits( &p_vpar->bit_stream, 23 );
 876 }
 877
 878
 879 /*****************************************************************************
 880  * CopyrightExtension : Keeps some legal informations                        *
 881  *****************************************************************************/
 882
 883 static void CopyrightExtension( vpar_thread_t * p_vpar )
 884 {
 885     u32     i_copyright_nb_1, i_copyright_nb_2; /* local integers */
 886     p_vpar->sequence.b_copyright_flag = GetBits( &p_vpar->bit_stream, 1 );
 887         /* A flag that says whether the copyright information is significant */
 888     p_vpar->sequence.i_copyright_id = GetBits( &p_vpar->bit_stream, 8 );
 889         /* An identifier compliant with ISO/CEI JTC 1/SC 29 */
 890     p_vpar->sequence.b_original = GetBits( &p_vpar->bit_stream, 1 );
 891         /* Reserved bits */
 892     DumpBits( &p_vpar->bit_stream, 8 );
 893         /* The copyright_number is split in three parts */
 894         /* first part */
 895     i_copyright_nb_1 = GetBits( &p_vpar->bit_stream, 20 );
 896     DumpBits( &p_vpar->bit_stream, 1 );
 897         /* second part */
 898     i_copyright_nb_2 = GetBits( &p_vpar->bit_stream, 22 );
 899     DumpBits( &p_vpar->bit_stream, 1 );
 900         /* third part and sum */
 901     p_vpar->sequence.i_copyright_nb = ( (u64)i_copyright_nb_1 << 44 ) +
 902                                       ( (u64)i_copyright_nb_2 << 22 ) +
 903                                       ( (u64)GetBits( &p_vpar->bit_stream, 22 ) );
 904 }
 905
 906
 907 /*****************************************************************************
 908  * LoadMatrix : Load a quantization matrix
 909  *****************************************************************************/
 910 static __inline__ void LoadMatrix( vpar_thread_t * p_vpar, quant_matrix_t * p_matrix )
 911 {
 912     int i_dummy;
 913
 914     if( !p_matrix->b_allocated )
 915     {
 916         /* Allocate a piece of memory to load the matrix. */
 917         p_matrix->pi_matrix = (int *)malloc( 64*sizeof(int) );
 918         p_matrix->b_allocated = 1;
 919     }
 920
 921     for( i_dummy = 0; i_dummy < 64; i_dummy++ )
 922     {
 923         p_matrix->pi_matrix[pi_scan[SCAN_ZIGZAG][i_dummy]]
 924              = GetBits( &p_vpar->bit_stream, 8 );
 925     }
 926
 927 #ifdef FOURIER_IDCT
 928     /* Discrete Fourier Transform requires the quantization matrices to
 929      * be normalized before using them. */
 930     vdec_NormQuantMatrix( p_matrix->pi_matrix );
 931 #endif
 932 }
 933
 934 /*****************************************************************************
 935  * LinkMatrix : Link a quantization matrix to another
 936  *****************************************************************************/
 937 static __inline__ void LinkMatrix( quant_matrix_t * p_matrix, int * pi_array )
 938 {
 939     int i_dummy;
 940
 941     if( p_matrix->b_allocated )
 942     {
 943         /* Deallocate the piece of memory. */
 944         free( p_matrix->pi_matrix );
 945         p_matrix->b_allocated = 0;
 946     }
 947
 948     p_matrix->pi_matrix = pi_array;
 949 }