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 #include "vpar_motion.h"
  42
  43 /*
  44  * Local prototypes
  45  */
  46 static __inline__ void NextStartCode( vpar_thread_t * p_vpar );
  47 static void SequenceHeader( vpar_thread_t * p_vpar );
  48 static void GroupHeader( vpar_thread_t * p_vpar );
  49 static void PictureHeader( vpar_thread_t * p_vpar );
  50 static void SliceHeader00( vpar_thread_t * p_vpar,
  51                            int * pi_mb_address, int i_mb_base,
  52                            u32 i_vert_code );
  53 static void SliceHeader01( vpar_thread_t * p_vpar,
  54                            int * pi_mb_address, int i_mb_base,
  55                            u32 i_vert_code );
  56 static void SliceHeader10( vpar_thread_t * p_vpar,
  57                            int * pi_mb_address, int i_mb_base,
  58                            u32 i_vert_code );
  59 static void SliceHeader11( vpar_thread_t * p_vpar,
  60                            int * pi_mb_address, int i_mb_base,
  61                            u32 i_vert_code );
  62 static __inline__ void SliceHeader( vpar_thread_t * p_vpar,
  63                                     int * pi_mb_address, int i_mb_base,
  64                                     u32 i_vert_code );
  65 static void ExtensionAndUserData( vpar_thread_t * p_vpar );
  66 static void QuantMatrixExtension( vpar_thread_t * p_vpar );
  67 static void SequenceScalableExtension( vpar_thread_t * p_vpar );
  68 static void SequenceDisplayExtension( vpar_thread_t * p_vpar );
  69 static void PictureDisplayExtension( vpar_thread_t * p_vpar );
  70 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar );
  71 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar );
  72 static void CopyrightExtension( vpar_thread_t * p_vpar );
  73
  74 /*
  75  * Standard variables
  76  */
  77
  78 /*****************************************************************************
  79  * pi_default_intra_quant : default quantization matrix
  80  *****************************************************************************/
  81 #ifndef VDEC_DFT
  82 int pi_default_intra_quant[] =
  83 {
  84     8,  16, 19, 22, 26, 27, 29, 34,
  85     16, 16, 22, 24, 27, 29, 34, 37,
  86     19, 22, 26, 27, 29, 34, 34, 38,
  87     22, 22, 26, 27, 29, 34, 37, 40,
  88     22, 26, 27, 29, 32, 35, 40, 48,
  89     26, 27, 29, 32, 35, 40, 48, 58,
  90     26, 27, 29, 34, 38, 46, 56, 69,
  91     27, 29, 35, 38, 46, 56, 69, 83
  92 };
  93 #else
  94 int pi_default_intra_quant[] =
  95 {
  96     2048,   5681,   6355,   6623,   6656,   5431,   4018,   2401,
  97     5681,   7880,   10207,  10021,  9587,   8091,   6534,   3625,
  98     6355,   10207,  11363,  10619,  9700,   8935,   6155,   3507,
  99     6623,   9186,   10226,  9557,   8730,   8041,   6028,   3322,
 100     5632,   9232,   9031,   8730,   8192,   7040,   5542,   3390,
 101     5230,   7533,   7621,   7568,   7040,   6321,   5225,   3219,
 102     3602,   5189,   5250,   5539,   5265,   5007,   4199,   2638,
 103     1907,   2841,   3230,   3156,   3249,   3108,   2638,   1617
 104 };
 105 #endif
 106
 107 /*****************************************************************************
 108  * pi_default_nonintra_quant : default quantization matrix
 109  *****************************************************************************/
 110 #ifndef VDEC_DFT
 111 int pi_default_nonintra_quant[] =
 112 {
 113     16, 16, 16, 16, 16, 16, 16, 16,
 114     16, 16, 16, 16, 16, 16, 16, 16,
 115     16, 16, 16, 16, 16, 16, 16, 16,
 116     16, 16, 16, 16, 16, 16, 16, 16,
 117     16, 16, 16, 16, 16, 16, 16, 16,
 118     16, 16, 16, 16, 16, 16, 16, 16,
 119     16, 16, 16, 16, 16, 16, 16, 16,
 120     16, 16, 16, 16, 16, 16, 16, 16
 121 };
 122 #else
 123 int pi_default_nonintra_quanit[] =
 124 {
 125     4096,   5680,   5344,   4816,   4096,   3216,   2224,   1136,
 126     5680,   7888,   7424,   6688,   5680,   4464,   3072,   1568,
 127     5344,   7424,   6992,   6288,   5344,   4208,   2896,   1472,
 128     4816,   6688,   6288,   5664,   4816,   3792,   2608,   1328,
 129     4096,   5680,   5344,   4816,   4096,   3216,   2224,   1136,
 130     3216,   4464,   4208,   3792,   3216,   2528,   1744,   880,
 131     2224,   3072,   2896,   2608,   2224,   1744,   1200,   608,
 132     1136,   1568,   1472,   1328,   1136,   880,    608,    304
 133 };
 134 #endif
 135
 136 /*****************************************************************************
 137  * pi_scan : zig-zag and alternate scan patterns
 138  *****************************************************************************/
 139 u8 pi_scan[2][64] =
 140 {
 141     { /* Zig-Zag pattern */
 142         0,1,8,16,9,2,3,10,17,24,32,25,18,11,4,5,
 143         12,19,26,33,40,48,41,34,27,20,13,6,7,14,21,28,
 144         35,42,49,56,57,50,43,36,29,22,15,23,30,37,44,51,
 145         58,59,52,45,38,31,39,46,53,60,61,54,47,55,62,63
 146     },
 147     { /* Alternate scan pattern */
 148         0,8,16,24,1,9,2,10,17,25,32,40,48,56,57,49,
 149         41,33,26,18,3,11,4,12,19,27,34,42,50,58,35,43,
 150         51,59,20,28,5,13,6,14,21,29,36,44,52,60,37,45,
 151         53,61,22,30,7,15,23,31,38,46,54,62,39,47,55,63
 152     }
 153 };
 154
 155 /*
 156  * Local inline functions.
 157  */
 158
 159 /*****************************************************************************
 160  * NextStartCode : Find the next start code
 161  *****************************************************************************/
 162 static __inline__ void NextStartCode( vpar_thread_t * p_vpar )
 163 {
 164     /* Re-align the buffer on an 8-bit boundary */
 165     RealignBits( &p_vpar->bit_stream );
 166
 167     while( ShowBits( &p_vpar->bit_stream, 24 ) != 0x01L && !p_vpar->b_die )
 168     {
 169         RemoveBits( &p_vpar->bit_stream, 8 );
 170     }
 171 }
 172
 173 /*****************************************************************************
 174  * ReferenceUpdate : Update the reference pointers when we have a new picture
 175  *****************************************************************************/
 176 static void __inline__ ReferenceUpdate( vpar_thread_t * p_vpar,
 177                                         int i_coding_type,
 178                                         picture_t * p_newref )
 179 {
 180     if( i_coding_type != B_CODING_TYPE )
 181     {
 182         if( p_vpar->sequence.p_forward != NULL )
 183             vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_forward );
 184         p_vpar->sequence.p_forward = p_vpar->sequence.p_backward;
 185         p_vpar->sequence.p_backward = p_newref;
 186         if( p_newref != NULL )
 187             vout_LinkPicture( p_vpar->p_vout, p_newref );
 188     }
 189 }
 190
 191 /*****************************************************************************
 192  * ReferenceReplace : Replace the last reference pointer when we destroy
 193  * a picture
 194  *****************************************************************************/
 195 static void __inline__ ReferenceReplace( vpar_thread_t * p_vpar,
 196                                          int i_coding_type,
 197                                          picture_t * p_newref )
 198 {
 199     if( i_coding_type != B_CODING_TYPE )
 200     {
 201         if( p_vpar->sequence.p_backward != NULL )
 202             vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_backward );
 203         p_vpar->sequence.p_backward = p_newref;
 204         if( p_newref != NULL )
 205             vout_LinkPicture( p_vpar->p_vout, p_newref );
 206     }
 207 }
 208
 209 /*****************************************************************************
 210  * LoadMatrix : Load a quantization matrix
 211  *****************************************************************************/
 212 static __inline__ void LoadMatrix( vpar_thread_t * p_vpar, quant_matrix_t * p_matrix )
 213 {
 214     int i_dummy;
 215
 216     if( !p_matrix->b_allocated )
 217     {
 218         /* Allocate a piece of memory to load the matrix. */
 219         p_matrix->pi_matrix = (int *)malloc( 64*sizeof(int) );
 220         p_matrix->b_allocated = 1;
 221     }
 222
 223     for( i_dummy = 0; i_dummy < 64; i_dummy++ )
 224     {
 225         p_matrix->pi_matrix[pi_scan[SCAN_ZIGZAG][i_dummy]]
 226              = GetBits( &p_vpar->bit_stream, 8 );
 227     }
 228
 229 #ifdef VDEC_DFT
 230     /* Discrete Fourier Transform requires the quantization matrices to
 231      * be normalized before using them. */
 232     vdec_NormQuantMatrix( p_matrix->pi_matrix );
 233 #endif
 234 }
 235
 236 /*****************************************************************************
 237  * LinkMatrix : Link a quantization matrix to another
 238  *****************************************************************************/
 239 static __inline__ void LinkMatrix( quant_matrix_t * p_matrix, int * pi_array )
 240 {
 241     if( p_matrix->b_allocated )
 242     {
 243         /* Deallocate the piece of memory. */
 244         free( p_matrix->pi_matrix );
 245         p_matrix->b_allocated = 0;
 246     }
 247
 248     p_matrix->pi_matrix = pi_array;
 249 }
 250
 251 /*
 252  * Exported functions.
 253  */
 254
 255 /*****************************************************************************
 256  * vpar_NextSequenceHeader : Find the next sequence header
 257  *****************************************************************************/
 258 int vpar_NextSequenceHeader( vpar_thread_t * p_vpar )
 259 {
 260     while( !p_vpar->b_die )
 261     {
 262         NextStartCode( p_vpar );
 263         if( ShowBits( &p_vpar->bit_stream, 32 ) == SEQUENCE_HEADER_CODE )
 264             return 0;
 265         RemoveBits( &p_vpar->bit_stream, 8 );
 266     }
 267     return 1;
 268 }
 269
 270 /*****************************************************************************
 271  * vpar_ParseHeader : Parse the next header
 272  *****************************************************************************/
 273 int vpar_ParseHeader( vpar_thread_t * p_vpar )
 274 {
 275     while( !p_vpar->b_die )
 276     {
 277         NextStartCode( p_vpar );
 278         switch( GetBits32( &p_vpar->bit_stream ) )
 279         {
 280         case SEQUENCE_HEADER_CODE:
 281             SequenceHeader( p_vpar );
 282             return 0;
 283             break;
 284
 285         case GROUP_START_CODE:
 286             GroupHeader( p_vpar );
 287             return 0;
 288             break;
 289
 290         case PICTURE_START_CODE:
 291             PictureHeader( p_vpar );
 292             return 0;
 293             break;
 294
 295         case SEQUENCE_END_CODE:
 296             intf_DbgMsg("vpar debug: sequence end code received\n");
 297             return 1;
 298             break;
 299
 300         default:
 301         }
 302     }
 303
 304     return 0;
 305 }
 306
 307 /*
 308  * Following functions are local
 309  */
 310
 311 /*****************************************************************************
 312  * SequenceHeader : Parse the next sequence header
 313  *****************************************************************************/
 314 static void SequenceHeader( vpar_thread_t * p_vpar )
 315 {
 316 #define RESERVED    -1
 317     static float r_frame_rate_table[16] =
 318     {
 319         0.0,
 320         ((23.0*1000.0)/1001.0),
 321         24.0,
 322         25.0,
 323         ((30.0*1000.0)/1001.0),
 324         30.0,
 325         50.0,
 326         ((60.0*1000.0)/1001.0),
 327         60.0,
 328         RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED
 329     };
 330 #undef RESERVED
 331
 332     int i_height_save, i_width_save;
 333
 334     i_height_save = p_vpar->sequence.i_height;
 335     i_width_save = p_vpar->sequence.i_width;
 336
 337     p_vpar->sequence.i_width = GetBits( &p_vpar->bit_stream, 12 );
 338     p_vpar->sequence.i_height = GetBits( &p_vpar->bit_stream, 12 );
 339     p_vpar->sequence.i_aspect_ratio = GetBits( &p_vpar->bit_stream, 4 );
 340     p_vpar->sequence.r_frame_rate =
 341             r_frame_rate_table[ GetBits( &p_vpar->bit_stream, 4 ) ];
 342
 343     /* We don't need bit_rate_value, marker_bit, vbv_buffer_size,
 344      * constrained_parameters_flag */
 345     RemoveBits( &p_vpar->bit_stream, 30 );
 346
 347     /*
 348      * Quantization matrices
 349      */
 350     if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_intra_quantizer_matrix */
 351     {
 352         LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
 353     }
 354     else
 355     {
 356         /* Use default matrix. */
 357         LinkMatrix( &p_vpar->sequence.intra_quant, pi_default_intra_quant );
 358     }
 359
 360     if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_non_intra_quantizer_matrix */
 361     {
 362         LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
 363     }
 364     else
 365     {
 366         /* Use default matrix. */
 367         LinkMatrix( &p_vpar->sequence.nonintra_quant, pi_default_nonintra_quant );
 368     }
 369
 370     /* Unless later overwritten by a matrix extension, we have the same
 371      * matrices for luminance and chrominance. */
 372     LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 373                 p_vpar->sequence.intra_quant.pi_matrix );
 374     LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
 375                 p_vpar->sequence.nonintra_quant.pi_matrix );
 376
 377     /*
 378      * Sequence Extension
 379      */
 380     NextStartCode( p_vpar );
 381     if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
 382     {
 383         int                         i_dummy;
 384         static f_chroma_pattern_t   ppf_chroma_pattern[4] =
 385                             {NULL, vpar_CodedPattern420,
 386                              vpar_CodedPattern422, vpar_CodedPattern444};
 387
 388         /* Turn the MPEG2 flag on */
 389         p_vpar->sequence.b_mpeg2 = 1;
 390
 391         /* Parse sequence_extension */
 392         RemoveBits32( &p_vpar->bit_stream );
 393         /* extension_start_code_identifier, profile_and_level_indication */
 394         RemoveBits( &p_vpar->bit_stream, 12 );
 395         p_vpar->sequence.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
 396         p_vpar->sequence.i_chroma_format = GetBits( &p_vpar->bit_stream, 2 );
 397         p_vpar->sequence.pf_decode_pattern = ppf_chroma_pattern
 398                                     [p_vpar->sequence.i_chroma_format];
 399         p_vpar->sequence.i_width |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
 400         p_vpar->sequence.i_height |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
 401         /* bit_rate_extension, marker_bit, vbv_buffer_size_extension, low_delay */
 402         RemoveBits( &p_vpar->bit_stream, 22 );
 403         /* frame_rate_extension_n */
 404         i_dummy = GetBits( &p_vpar->bit_stream, 2 );
 405         /* frame_rate_extension_d */
 406         p_vpar->sequence.r_frame_rate *= (i_dummy + 1)
 407                                   / (GetBits( &p_vpar->bit_stream, 5 ) + 1);
 408
 409         p_vpar->sequence.pf_decode_mv = vpar_MPEG2MotionVector;
 410     }
 411     else
 412     {
 413         /* It's an MPEG-1 stream. Put adequate parameters. */
 414
 415         p_vpar->sequence.b_mpeg2 = 0;
 416         p_vpar->sequence.b_progressive = 1;
 417         p_vpar->sequence.i_chroma_format = CHROMA_420;
 418         p_vpar->sequence.pf_decode_pattern = vpar_CodedPattern420;
 419
 420         p_vpar->sequence.pf_decode_mv = vpar_MPEG1MotionVector;
 421     }
 422
 423     /* Update sizes */
 424     p_vpar->sequence.i_mb_width = (p_vpar->sequence.i_width + 15) / 16;
 425     p_vpar->sequence.i_mb_height = (p_vpar->sequence.b_progressive) ?
 426                                    (p_vpar->sequence.i_height + 15) / 16 :
 427                                    2 * ((p_vpar->sequence.i_height + 31) / 32);
 428     p_vpar->sequence.i_mb_size = p_vpar->sequence.i_mb_width
 429                                         * p_vpar->sequence.i_mb_height;
 430     p_vpar->sequence.i_width = (p_vpar->sequence.i_mb_width * 16);
 431     p_vpar->sequence.i_height = (p_vpar->sequence.i_mb_height * 16);
 432     p_vpar->sequence.i_size = p_vpar->sequence.i_width
 433                                         * p_vpar->sequence.i_height;
 434
 435     /* Update chromatic information */
 436     switch( p_vpar->sequence.i_chroma_format )
 437     {
 438     case CHROMA_420:
 439         p_vpar->sequence.i_chroma_nb_blocks = 2;
 440         p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width >> 1;
 441         p_vpar->sequence.i_chroma_mb_width = 8;
 442         p_vpar->sequence.i_chroma_mb_height = 8;
 443         break;
 444
 445     case CHROMA_422:
 446         p_vpar->sequence.i_chroma_nb_blocks = 4;
 447         p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width >> 1;
 448         p_vpar->sequence.i_chroma_mb_width = 8;
 449         p_vpar->sequence.i_chroma_mb_height = 16;
 450         break;
 451
 452     case CHROMA_444:
 453         p_vpar->sequence.i_chroma_nb_blocks = 8;
 454         p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width;
 455         p_vpar->sequence.i_chroma_mb_width = 16;
 456         p_vpar->sequence.i_chroma_mb_height = 16;
 457     }
 458
 459     /* Slice Header functions */
 460     if( p_vpar->sequence.i_height <= 2800 )
 461     {
 462         if( p_vpar->sequence.i_scalable_mode != SC_DP )
 463         {
 464             p_vpar->sequence.pf_slice_header = SliceHeader00;
 465         }
 466         else
 467         {
 468             p_vpar->sequence.pf_slice_header = SliceHeader01;
 469         }
 470     }
 471     else
 472     {
 473         if( p_vpar->sequence.i_scalable_mode != SC_DP )
 474         {
 475             p_vpar->sequence.pf_slice_header = SliceHeader10;
 476         }
 477         else
 478         {
 479             p_vpar->sequence.pf_slice_header = SliceHeader11;
 480         }
 481     }
 482
 483     if(    p_vpar->sequence.i_width != i_width_save
 484         || p_vpar->sequence.i_height != i_height_save )
 485     {
 486          /* What do we do in case of a size change ??? */
 487     }
 488
 489     /* Extension and User data */
 490     ExtensionAndUserData( p_vpar );
 491 }
 492
 493 /*****************************************************************************
 494  * GroupHeader : Parse the next group of pictures header
 495  *****************************************************************************/
 496 static void GroupHeader( vpar_thread_t * p_vpar )
 497 {
 498     /* Nothing to do, we don't care. */
 499     RemoveBits( &p_vpar->bit_stream, 27 );
 500     ExtensionAndUserData( p_vpar );
 501 }
 502
 503 /*****************************************************************************
 504  * PictureHeader : Parse the next picture header
 505  *****************************************************************************/
 506 static void PictureHeader( vpar_thread_t * p_vpar )
 507 {
 508     static f_macroblock_type_t ppf_macroblock_type[5] = {NULL,
 509                                                   vpar_IMBType, vpar_PMBType,
 510                                                   vpar_BMBType, vpar_DMBType};
 511
 512     int                 i_structure;
 513     int                 i_mb_address, i_mb_base, i_mb;
 514     boolean_t           b_parsable;
 515     u32                 i_dummy;
 516
 517     RemoveBits( &p_vpar->bit_stream, 10 ); /* temporal_reference */
 518     p_vpar->picture.i_coding_type = GetBits( &p_vpar->bit_stream, 3 );
 519     p_vpar->picture.pf_macroblock_type = ppf_macroblock_type
 520                                          [p_vpar->picture.i_coding_type];
 521     RemoveBits( &p_vpar->bit_stream, 16 ); /* vbv_delay */
 522
 523     if( p_vpar->picture.i_coding_type == P_CODING_TYPE || p_vpar->picture.i_coding_type == B_CODING_TYPE )
 524     {
 525         p_vpar->picture.pb_full_pel_vector[0] = GetBits( &p_vpar->bit_stream, 1 );
 526         p_vpar->picture.i_forward_f_code = GetBits( &p_vpar->bit_stream, 3 );
 527     }
 528     if( p_vpar->picture.i_coding_type == B_CODING_TYPE )
 529     {
 530         p_vpar->picture.pb_full_pel_vector[1] = GetBits( &p_vpar->bit_stream, 1 );
 531         p_vpar->picture.i_backward_f_code = GetBits( &p_vpar->bit_stream, 3 );
 532     }
 533
 534     /* extra_information_picture */
 535     while( GetBits( &p_vpar->bit_stream, 1 ) )
 536     {
 537         RemoveBits( &p_vpar->bit_stream, 8 );
 538     }
 539
 540     /*
 541      * Picture Coding Extension
 542      */
 543     NextStartCode( p_vpar );
 544     if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
 545     {
 546         /* Parse picture_coding_extension */
 547         RemoveBits32( &p_vpar->bit_stream );
 548         /* extension_start_code_identifier */
 549         RemoveBits( &p_vpar->bit_stream, 4 );
 550
 551         p_vpar->picture.ppi_f_code[0][0] = GetBits( &p_vpar->bit_stream, 4 );
 552         p_vpar->picture.ppi_f_code[0][1] = GetBits( &p_vpar->bit_stream, 4 );
 553         p_vpar->picture.ppi_f_code[1][0] = GetBits( &p_vpar->bit_stream, 4 );
 554         p_vpar->picture.ppi_f_code[1][1] = GetBits( &p_vpar->bit_stream, 4 );
 555         p_vpar->picture.i_intra_dc_precision = GetBits( &p_vpar->bit_stream, 2 );
 556         i_structure = GetBits( &p_vpar->bit_stream, 2 );
 557         p_vpar->picture.b_top_field_first = GetBits( &p_vpar->bit_stream, 1 );
 558         p_vpar->picture.b_frame_pred_frame_dct
 559              = GetBits( &p_vpar->bit_stream, 1 );
 560         p_vpar->picture.b_concealment_mv = GetBits( &p_vpar->bit_stream, 1 );
 561         p_vpar->picture.b_q_scale_type = GetBits( &p_vpar->bit_stream, 1 );
 562         p_vpar->picture.b_intra_vlc_format = GetBits( &p_vpar->bit_stream, 1 );
 563         p_vpar->picture.b_alternate_scan = GetBits( &p_vpar->bit_stream, 1 );
 564         p_vpar->picture.b_repeat_first_field = GetBits( &p_vpar->bit_stream, 1 );
 565         /* repeat_first_field (ISO/IEC 13818-2 6.3.10 is necessary to know
 566          * the length of the picture_display_extension structure.
 567          * chroma_420_type (obsolete) */
 568         RemoveBits( &p_vpar->bit_stream, 1 );
 569         p_vpar->picture.b_progressive_frame = GetBits( &p_vpar->bit_stream, 1 );
 570
 571         /* composite_display_flag */
 572         if( GetBits( &p_vpar->bit_stream, 1 ) )
 573         {
 574             /* v_axis, field_sequence, sub_carrier, burst_amplitude,
 575              * sub_carrier_phase */
 576             RemoveBits( &p_vpar->bit_stream, 20 );
 577         }
 578     }
 579     else
 580     {
 581         /* MPEG-1 compatibility flags */
 582         p_vpar->picture.i_intra_dc_precision = 0; /* 8 bits */
 583         i_structure = FRAME_STRUCTURE;
 584         p_vpar->picture.b_frame_pred_frame_dct = 1;
 585         p_vpar->picture.b_concealment_mv = 0;
 586         p_vpar->picture.b_q_scale_type = 0;
 587         p_vpar->picture.b_intra_vlc_format = 0;
 588         p_vpar->picture.b_alternate_scan = 0; /* zigzag */
 589         p_vpar->picture.b_repeat_first_field = 0;
 590         p_vpar->picture.b_progressive_frame = 1;
 591     }
 592
 593     if( p_vpar->picture.i_current_structure &&
 594         (i_structure == FRAME_STRUCTURE ||
 595          i_structure == p_vpar->picture.i_current_structure) )
 596     {
 597         /* We don't have the second field of the buffered frame. */
 598         if( p_vpar->picture.p_picture != NULL )
 599         {
 600             ReferenceReplace( p_vpar,
 601                       p_vpar->picture.i_coding_type,
 602                       NULL );
 603
 604             for( i_mb = 0; i_mb < p_vpar->sequence.i_mb_size >> 1; i_mb++ )
 605             {
 606                 vpar_DestroyMacroblock( &p_vpar->vfifo,
 607                                         p_vpar->picture.pp_mb[i_mb] );
 608             }
 609             vout_DestroyPicture( p_vpar->p_vout, p_vpar->picture.p_picture );
 610         }
 611
 612         p_vpar->picture.i_current_structure = 0;
 613
 614         intf_DbgMsg("vpar debug: odd number of field picture.\n");
 615     }
 616
 617     if( p_vpar->picture.i_current_structure )
 618     {
 619         /* Second field of a frame. We will decode it if, and only if we
 620          * have decoded the first frame. */
 621         b_parsable = (p_vpar->picture.p_picture != NULL);
 622     }
 623     else
 624     {
 625         /* Do we have the reference pictures ? */
 626         b_parsable = !((p_vpar->picture.i_coding_type == P_CODING_TYPE) &&
 627                        (p_vpar->sequence.p_forward == NULL)) ||
 628                       ((p_vpar->picture.i_coding_type == B_CODING_TYPE) &&
 629                        (p_vpar->sequence.p_forward == NULL ||
 630                         p_vpar->sequence.p_backward == NULL));
 631
 632         if( b_parsable )
 633         {
 634             /* Does synchro say we have enough time to decode it ? */
 635             b_parsable = vpar_SynchroChoose( p_vpar,
 636                                p_vpar->picture.i_coding_type, i_structure );
 637         }
 638     }
 639
 640     if( !b_parsable )
 641     {
 642         /* Update the reference pointers. */
 643         ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, NULL );
 644
 645         /* Warn Synchro we have trashed a picture. */
 646         vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
 647
 648         /* Update context. */
 649         if( i_structure != FRAME_STRUCTURE )
 650             p_vpar->picture.i_current_structure = i_structure;
 651         p_vpar->picture.p_picture = NULL;
 652
 653         return;
 654     }
 655
 656     /* OK, now we are sure we will decode the picture. */
 657 #define P_picture p_vpar->picture.p_picture
 658     p_vpar->picture.b_error = 0;
 659
 660     if( !p_vpar->picture.i_current_structure )
 661     {
 662         /* This is a new frame. Get a structure from the video_output. */
 663         if( ( P_picture = vout_CreatePicture( p_vpar->p_vout,
 664                                         99+p_vpar->sequence.i_chroma_format, /*???*/
 665                                         p_vpar->sequence.i_width,
 666                                         p_vpar->sequence.i_height,
 667                                         p_vpar->sequence.i_width*sizeof(yuv_data_t) ) )
 668              == NULL )
 669         {
 670             intf_ErrMsg("vpar debug: allocation error in vout_CreatePicture\n");
 671             p_vpar->b_error = 1;
 672             return;
 673         }
 674
 675         /* Initialize values. */
 676         P_picture->date = vpar_SynchroDecode( p_vpar,
 677                                               p_vpar->picture.i_coding_type,
 678                                               i_structure );
 679         p_vpar->picture.i_l_stride = - 8 + ( p_vpar->sequence.i_width
 680                     << ( 1 - p_vpar->picture.b_frame_structure ) );
 681         p_vpar->picture.i_c_stride = - 8 + ( p_vpar->sequence.i_chroma_width
 682                     << ( 1 - p_vpar->picture.b_frame_structure ));
 683
 684         P_picture->i_deccount = p_vpar->sequence.i_mb_size;
 685         memset( p_vpar->picture.pp_mb, 0, MAX_MB );
 686
 687         /* Update the reference pointers. */
 688         ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, P_picture );
 689     }
 690     p_vpar->picture.i_current_structure |= i_structure;
 691     p_vpar->picture.i_structure = i_structure;
 692     p_vpar->picture.b_frame_structure = (i_structure == FRAME_STRUCTURE);
 693
 694     /* Initialize picture data for decoding. */
 695     if( i_structure == BOTTOM_FIELD )
 696     {
 697         i_mb_base = p_vpar->sequence.i_mb_size >> 1;
 698         p_vpar->mb.i_l_y = 1;
 699         p_vpar->mb.i_c_y = 1;
 700     }
 701     else
 702     {
 703         i_mb_base = 0;
 704         p_vpar->mb.i_l_y = p_vpar->mb.i_c_y = 0;
 705     }
 706     i_mb_address = 0;
 707     p_vpar->mb.i_l_x = p_vpar->mb.i_c_x = 0;
 708
 709     /* Extension and User data. */
 710     ExtensionAndUserData( p_vpar );
 711
 712     /* Picture data (ISO/IEC 13818-2 6.2.3.7). */
 713     NextStartCode( p_vpar );
 714     while( i_mb_address+i_mb_base < p_vpar->sequence.i_mb_size
 715            && !p_vpar->picture.b_error && !p_vpar->b_die )
 716     {
 717         if( ((i_dummy = ShowBits( &p_vpar->bit_stream, 32 ))
 718                  < SLICE_START_CODE_MIN) ||
 719             (i_dummy > SLICE_START_CODE_MAX) )
 720         {
 721             intf_DbgMsg("vpar debug: premature end of picture\n");
 722             p_vpar->picture.b_error = 1;
 723             break;
 724         }
 725         RemoveBits32( &p_vpar->bit_stream );
 726
 727         /* Decode slice data. */
 728         p_vpar->sequence.pf_slice_header( p_vpar, &i_mb_address, i_mb_base, i_dummy & 255 );
 729     }
 730
 731     if( p_vpar->picture.b_error )
 732     {
 733         /* Trash picture. */
 734 fprintf(stderr, "Image trashee\n");
 735         for( i_mb = 1; p_vpar->picture.pp_mb[i_mb]; i_mb++ )
 736         {
 737             vpar_DestroyMacroblock( &p_vpar->vfifo, p_vpar->picture.pp_mb[i_mb] );
 738         }
 739         vout_DestroyPicture( p_vpar->p_vout, p_vpar->picture.p_picture );
 740
 741         ReferenceReplace( p_vpar, p_vpar->picture.i_coding_type, NULL );
 742
 743         /* Prepare context for the next picture. */
 744         P_picture = NULL;
 745         if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
 746             p_vpar->picture.i_current_structure = 0;
 747     }
 748     else if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
 749     {
 750 fprintf(stderr, "Image parsee\n");
 751         /* Frame completely parsed. */
 752         for( i_mb = 1; p_vpar->picture.pp_mb[i_mb]; i_mb++ )
 753         {
 754             vpar_DecodeMacroblock( &p_vpar->vfifo, p_vpar->picture.pp_mb[i_mb] );
 755         }
 756
 757         /* Link referenced pictures for the decoder
 758          * They are unlinked in vpar_ReleaseMacroblock() & vpar_DestroyMacroblock() */
 759 #if 0
 760         if( p_vpar->sequence.p_forward != NULL )
 761         {
 762             vout_LinkPicture( p_vpar->p_vout, p_vpar->sequence.p_forward );
 763         }
 764         if( p_vpar->sequence.p_backward != NULL )
 765         {
 766             vout_LinkPicture( p_vpar->p_vout, p_vpar->sequence.p_backward );
 767         }
 768 #endif
 769         /* Send signal to the video_decoder. */
 770         vlc_mutex_lock( &p_vpar->vfifo.lock );
 771         vlc_cond_signal( &p_vpar->vfifo.wait );
 772         vlc_mutex_unlock( &p_vpar->vfifo.lock );
 773
 774         /* Prepare context for the next picture. */
 775         P_picture = NULL;
 776         p_vpar->picture.i_current_structure = 0;
 777     }
 778 #undef P_picture
 779 }
 780
 781 /*****************************************************************************
 782  * SliceHeader : Parse the next slice structure
 783  *****************************************************************************/
 784 static __inline__ void SliceHeader( vpar_thread_t * p_vpar,
 785                                     int * pi_mb_address, int i_mb_base,
 786                                     u32 i_vert_code )
 787 {
 788     /* DC predictors initialization table */
 789     static int              pi_dc_dct_reinit[4] = {128,256,512,1024};
 790
 791     int                     i_mb_address_save = *pi_mb_address;
 792
 793     /* slice_vertical_position_extension and priority_breakpoint already done */
 794     LoadQuantizerScale( p_vpar );
 795
 796     if( GetBits( &p_vpar->bit_stream, 1 ) )
 797     {
 798         /* intra_slice, slice_id */
 799         RemoveBits( &p_vpar->bit_stream, 8 );
 800         /* extra_information_slice */
 801         while( GetBits( &p_vpar->bit_stream, 1 ) )
 802         {
 803             RemoveBits( &p_vpar->bit_stream, 8 );
 804         }
 805     }
 806     *pi_mb_address = (i_vert_code - 1)*p_vpar->sequence.i_mb_width;
 807
 808     /* Reset DC coefficients predictors (ISO/IEC 13818-2 7.2.1). Why
 809      * does the reference decoder put 0 instead of the normative values ? */
 810     p_vpar->slice.pi_dc_dct_pred[0] = p_vpar->slice.pi_dc_dct_pred[1]
 811         = p_vpar->slice.pi_dc_dct_pred[2]
 812         = pi_dc_dct_reinit[p_vpar->picture.i_intra_dc_precision];
 813
 814     /* Reset motion vector predictors (ISO/IEC 13818-2 7.6.3.4). */
 815     memset( p_vpar->slice.pppi_pmv, 0, 8*sizeof(int) );
 816
 817     do
 818     {
 819         vpar_ParseMacroblock( p_vpar, pi_mb_address, i_mb_address_save,
 820                               i_mb_base );
 821         i_mb_address_save = *pi_mb_address;
 822     }
 823     while( ShowBits( &p_vpar->bit_stream, 23 ) && !p_vpar->b_die );
 824     NextStartCode( p_vpar );
 825 }
 826
 827 /*****************************************************************************
 828  * SliceHeaderXY : Parse the next slice structure
 829  *****************************************************************************
 830  * X = i_height > 2800 ?
 831  * Y = scalable_mode == SC_DP ?
 832  *****************************************************************************/
 833 static void SliceHeader00( vpar_thread_t * p_vpar,
 834                            int * pi_mb_address, int i_mb_base,
 835                            u32 i_vert_code )
 836 {
 837     SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
 838 }
 839
 840 static void SliceHeader01( vpar_thread_t * p_vpar,
 841                            int * pi_mb_address, int i_mb_base,
 842                            u32 i_vert_code )
 843 {
 844     RemoveBits( &p_vpar->bit_stream, 7 ); /* priority_breakpoint */
 845     SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
 846 }
 847
 848 static void SliceHeader10( vpar_thread_t * p_vpar,
 849                            int * pi_mb_address, int i_mb_base,
 850                            u32 i_vert_code )
 851 {
 852     i_vert_code += GetBits( &p_vpar->bit_stream, 3 ) << 7;
 853     SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
 854 }
 855
 856 static void SliceHeader11( vpar_thread_t * p_vpar,
 857                            int * pi_mb_address, int i_mb_base,
 858                            u32 i_vert_code )
 859 {
 860     i_vert_code += GetBits( &p_vpar->bit_stream, 3 ) << 7;
 861     RemoveBits( &p_vpar->bit_stream, 7 ); /* priority_breakpoint */
 862     SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
 863 }
 864
 865 /*****************************************************************************
 866  * ExtensionAndUserData : Parse the extension_and_user_data structure
 867  *****************************************************************************/
 868 static void ExtensionAndUserData( vpar_thread_t * p_vpar )
 869 {
 870     while( !p_vpar->b_die )
 871     {
 872         NextStartCode( p_vpar );
 873         switch( ShowBits( &p_vpar->bit_stream, 32 ) )
 874         {
 875         case EXTENSION_START_CODE:
 876             RemoveBits32( &p_vpar->bit_stream );
 877             switch( GetBits( &p_vpar->bit_stream, 4 ) )
 878             {
 879             case SEQUENCE_DISPLAY_EXTENSION_ID:
 880                 SequenceDisplayExtension( p_vpar );
 881                 break;
 882             case QUANT_MATRIX_EXTENSION_ID:
 883                 QuantMatrixExtension( p_vpar );
 884                 break;
 885             case SEQUENCE_SCALABLE_EXTENSION_ID:
 886                 SequenceScalableExtension( p_vpar );
 887                 break;
 888             case PICTURE_DISPLAY_EXTENSION_ID:
 889                 PictureDisplayExtension( p_vpar );
 890                 break;
 891             case PICTURE_SPATIAL_SCALABLE_EXTENSION_ID:
 892                 PictureSpatialScalableExtension( p_vpar );
 893                 break;
 894             case PICTURE_TEMPORAL_SCALABLE_EXTENSION_ID:
 895                 PictureTemporalScalableExtension( p_vpar );
 896                 break;
 897             case COPYRIGHT_EXTENSION_ID:
 898                 CopyrightExtension( p_vpar );
 899                 break;
 900             default:
 901             }
 902             break;
 903
 904         case USER_DATA_START_CODE:
 905             RemoveBits32( &p_vpar->bit_stream );
 906             /* Wait for the next start code */
 907             break;
 908
 909         default:
 910             return;
 911         }
 912     }
 913 }
 914
 915
 916 /*****************************************************************************
 917  * SequenceDisplayExtension : Parse the sequence_display_extension structure *
 918  *****************************************************************************/
 919
 920 static void SequenceDisplayExtension( vpar_thread_t * p_vpar )
 921 {
 922     /* We don't care sequence_display_extension. */
 923     /* video_format */
 924     RemoveBits( &p_vpar->bit_stream, 3 );
 925     if( GetBits( &p_vpar->bit_stream, 1 ) )
 926     {
 927         /* Three bytes for color_desciption */
 928         RemoveBits( &p_vpar->bit_stream, 24 );
 929     }
 930     /* display_horizontal and vertical_size and a marker_bit */
 931     RemoveBits( &p_vpar->bit_stream, 29 );
 932 }
 933
 934
 935 /*****************************************************************************
 936  * QuantMatrixExtension : Load quantization matrices for luminance           *
 937  *                        and chrominance                                    *
 938  *****************************************************************************/
 939
 940 static void QuantMatrixExtension( vpar_thread_t * p_vpar )
 941 {
 942     if( GetBits( &p_vpar->bit_stream, 1 ) )
 943     {
 944         /* Load intra_quantiser_matrix for luminance. */
 945         LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
 946     }
 947     else
 948     {
 949         /* Use the default matrix. */
 950         LinkMatrix( &p_vpar->sequence.intra_quant,
 951                     pi_default_intra_quant );
 952     }
 953     if( GetBits( &p_vpar->bit_stream, 1 ) )
 954     {
 955         /* Load non_intra_quantiser_matrix for luminance. */
 956         LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
 957     }
 958     else
 959     {
 960         /* Use the default matrix. */
 961         LinkMatrix( &p_vpar->sequence.nonintra_quant,
 962                     pi_default_nonintra_quant );
 963     }
 964     if( GetBits( &p_vpar->bit_stream, 1 ) )
 965     {
 966         /* Load intra_quantiser_matrix for chrominance. */
 967         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_intra_quant );
 968     }
 969     else
 970     {
 971         /* Link the chrominance intra matrix to the luminance one. */
 972         LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 973                     p_vpar->sequence.intra_quant.pi_matrix );
 974     }
 975     if( GetBits( &p_vpar->bit_stream, 1 ) )
 976     {
 977         /* Load non_intra_quantiser_matrix for chrominance. */
 978         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
 979     }
 980     else
 981     {
 982         /* Link the chrominance intra matrix to the luminance one. */
 983         LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 984                     p_vpar->sequence.intra_quant.pi_matrix );
 985     }
 986     if( GetBits( &p_vpar->bit_stream, 1 ) )
 987     {
 988         /* Load non_intra_quantiser_matrix for chrominance. */
 989         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
 990     }
 991     else
 992     {
 993         /* Link the chrominance nonintra matrix to the luminance one. */
 994         LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
 995                     p_vpar->sequence.nonintra_quant.pi_matrix );
 996     }
 997 }
 998
 999
1000 /*****************************************************************************
1001  * SequenceScalableExtension : Parse the sequence_scalable_extension         *
1002  *                             structure to handle scalable coding           *
1003  *****************************************************************************/
1004
1005 static void SequenceScalableExtension( vpar_thread_t * p_vpar )
1006 {
1007     /* We don't care about anything scalable except the scalable mode. */
1008     switch( p_vpar->sequence.i_scalable_mode = GetBits( &p_vpar->bit_stream, 2 ) )
1009     /* The length of the structure depends on the value of the scalable_mode */
1010     {
1011         case 1:
1012             RemoveBits32( &p_vpar->bit_stream );
1013             RemoveBits( &p_vpar->bit_stream, 21 );
1014             break;
1015         case 2:
1016             RemoveBits( &p_vpar->bit_stream, 12 );
1017             break;
1018         default:
1019             RemoveBits( &p_vpar->bit_stream, 4 );
1020     }
1021
1022 }
1023 /*****************************************************************************
1024  * PictureDisplayExtension : Parse the picture_display_extension structure   *
1025  *****************************************************************************/
1026
1027 static void PictureDisplayExtension( vpar_thread_t * p_vpar )
1028 {
1029     /* Number of frame center offset */
1030     int nb;
1031     /* I am not sure it works but it should
1032         (fewer tests than shown in §6.3.12) */
1033     nb = p_vpar->sequence.b_progressive ? p_vpar->sequence.b_progressive +
1034                                           p_vpar->picture.b_repeat_first_field +
1035                                           p_vpar->picture.b_top_field_first
1036                          : ( p_vpar->picture.b_frame_structure + 1 ) +
1037                            p_vpar->picture.b_repeat_first_field;
1038     RemoveBits( &p_vpar->bit_stream, 34 * nb );
1039 }
1040
1041
1042 /*****************************************************************************
1043  * PictureSpatialScalableExtension                                           *
1044  *****************************************************************************/
1045
1046 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar )
1047 {
1048     /* That's scalable, so we trash it */
1049     RemoveBits32( &p_vpar->bit_stream );
1050     RemoveBits( &p_vpar->bit_stream, 16 );
1051 }
1052
1053
1054 /*****************************************************************************
1055  * PictureTemporalScalableExtension                                          *
1056  *****************************************************************************/
1057
1058 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar )
1059 {
1060     /* Scalable again, trashed again */
1061     RemoveBits( &p_vpar->bit_stream, 23 );
1062 }
1063
1064
1065 /*****************************************************************************
1066  * CopyrightExtension : Keeps some legal informations                        *
1067  *****************************************************************************/
1068
1069 static void CopyrightExtension( vpar_thread_t * p_vpar )
1070 {
1071     u32     i_copyright_nb_1, i_copyright_nb_2; /* local integers */
1072     p_vpar->sequence.b_copyright_flag = GetBits( &p_vpar->bit_stream, 1 );
1073         /* A flag that says whether the copyright information is significant */
1074     p_vpar->sequence.i_copyright_id = GetBits( &p_vpar->bit_stream, 8 );
1075         /* An identifier compliant with ISO/CEI JTC 1/SC 29 */
1076     p_vpar->sequence.b_original = GetBits( &p_vpar->bit_stream, 1 );
1077         /* Reserved bits */
1078     RemoveBits( &p_vpar->bit_stream, 8 );
1079         /* The copyright_number is split in three parts */
1080         /* first part */
1081     i_copyright_nb_1 = GetBits( &p_vpar->bit_stream, 20 );
1082     RemoveBits( &p_vpar->bit_stream, 1 );
1083         /* second part */
1084     i_copyright_nb_2 = GetBits( &p_vpar->bit_stream, 22 );
1085     RemoveBits( &p_vpar->bit_stream, 1 );
1086         /* third part and sum */
1087     p_vpar->sequence.i_copyright_nb = ( (u64)i_copyright_nb_1 << 44 ) +
1088                                       ( (u64)i_copyright_nb_2 << 22 ) +
1089                                       ( (u64)GetBits( &p_vpar->bit_stream, 22 ) );
1090 }