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_forward != NULL )
 202             vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_forward );
 203         p_vpar->sequence.p_forward = p_vpar->sequence.p_backward;
 204         p_vpar->sequence.p_backward = p_newref;
 205         if( p_newref != NULL )
 206             vout_LinkPicture( p_vpar->p_vout, p_newref );
 207     }
 208 }
 209
 210 /*****************************************************************************
 211  * LoadMatrix : Load a quantization matrix
 212  *****************************************************************************/
 213 static __inline__ void LoadMatrix( vpar_thread_t * p_vpar, quant_matrix_t * p_matrix )
 214 {
 215     int i_dummy;
 216
 217     if( !p_matrix->b_allocated )
 218     {
 219         /* Allocate a piece of memory to load the matrix. */
 220         p_matrix->pi_matrix = (int *)malloc( 64*sizeof(int) );
 221         p_matrix->b_allocated = 1;
 222     }
 223
 224     for( i_dummy = 0; i_dummy < 64; i_dummy++ )
 225     {
 226         p_matrix->pi_matrix[pi_scan[SCAN_ZIGZAG][i_dummy]]
 227              = GetBits( &p_vpar->bit_stream, 8 );
 228     }
 229
 230 #ifdef VDEC_DFT
 231     /* Discrete Fourier Transform requires the quantization matrices to
 232      * be normalized before using them. */
 233     vdec_NormQuantMatrix( p_matrix->pi_matrix );
 234 #endif
 235 }
 236
 237 /*****************************************************************************
 238  * LinkMatrix : Link a quantization matrix to another
 239  *****************************************************************************/
 240 static __inline__ void LinkMatrix( quant_matrix_t * p_matrix, int * pi_array )
 241 {
 242     if( p_matrix->b_allocated )
 243     {
 244         /* Deallocate the piece of memory. */
 245         free( p_matrix->pi_matrix );
 246         p_matrix->b_allocated = 0;
 247     }
 248
 249     p_matrix->pi_matrix = pi_array;
 250 }
 251
 252 /*
 253  * Exported functions.
 254  */
 255
 256 /*****************************************************************************
 257  * vpar_NextSequenceHeader : Find the next sequence header
 258  *****************************************************************************/
 259 int vpar_NextSequenceHeader( vpar_thread_t * p_vpar )
 260 {
 261     while( !p_vpar->b_die )
 262     {
 263         NextStartCode( p_vpar );
 264         if( ShowBits( &p_vpar->bit_stream, 32 ) == SEQUENCE_HEADER_CODE )
 265             return 0;
 266         RemoveBits( &p_vpar->bit_stream, 8 );
 267     }
 268     return 1;
 269 }
 270
 271 /*****************************************************************************
 272  * vpar_ParseHeader : Parse the next header
 273  *****************************************************************************/
 274 int vpar_ParseHeader( vpar_thread_t * p_vpar )
 275 {
 276     while( !p_vpar->b_die )
 277     {
 278         NextStartCode( p_vpar );
 279         switch( GetBits32( &p_vpar->bit_stream ) )
 280         {
 281         case SEQUENCE_HEADER_CODE:
 282             SequenceHeader( p_vpar );
 283             return 0;
 284             break;
 285
 286         case GROUP_START_CODE:
 287             GroupHeader( p_vpar );
 288             return 0;
 289             break;
 290
 291         case PICTURE_START_CODE:
 292             PictureHeader( p_vpar );
 293             return 0;
 294             break;
 295
 296         case SEQUENCE_END_CODE:
 297             intf_DbgMsg("vpar debug: sequence end code received\n");
 298             return 1;
 299             break;
 300
 301         default:
 302         }
 303     }
 304
 305     return 0;
 306 }
 307
 308 /*
 309  * Following functions are local
 310  */
 311
 312 /*****************************************************************************
 313  * SequenceHeader : Parse the next sequence header
 314  *****************************************************************************/
 315 static void SequenceHeader( vpar_thread_t * p_vpar )
 316 {
 317 #define RESERVED    -1
 318     static float r_frame_rate_table[16] =
 319     {
 320         0.0,
 321         ((23.0*1000.0)/1001.0),
 322         24.0,
 323         25.0,
 324         ((30.0*1000.0)/1001.0),
 325         30.0,
 326         50.0,
 327         ((60.0*1000.0)/1001.0),
 328         60.0,
 329         RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED
 330     };
 331 #undef RESERVED
 332
 333     int i_height_save, i_width_save;
 334
 335     i_height_save = p_vpar->sequence.i_height;
 336     i_width_save = p_vpar->sequence.i_width;
 337
 338     p_vpar->sequence.i_width = GetBits( &p_vpar->bit_stream, 12 );
 339     p_vpar->sequence.i_height = GetBits( &p_vpar->bit_stream, 12 );
 340     p_vpar->sequence.i_aspect_ratio = GetBits( &p_vpar->bit_stream, 4 );
 341     p_vpar->sequence.r_frame_rate =
 342             r_frame_rate_table[ GetBits( &p_vpar->bit_stream, 4 ) ];
 343
 344     /* We don't need bit_rate_value, marker_bit, vbv_buffer_size,
 345      * constrained_parameters_flag */
 346     RemoveBits( &p_vpar->bit_stream, 30 );
 347
 348     /*
 349      * Quantization matrices
 350      */
 351     if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_intra_quantizer_matrix */
 352     {
 353         LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
 354     }
 355     else
 356     {
 357         /* Use default matrix. */
 358         LinkMatrix( &p_vpar->sequence.intra_quant, pi_default_intra_quant );
 359     }
 360
 361     if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_non_intra_quantizer_matrix */
 362     {
 363         LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
 364     }
 365     else
 366     {
 367         /* Use default matrix. */
 368         LinkMatrix( &p_vpar->sequence.nonintra_quant, pi_default_nonintra_quant );
 369     }
 370
 371     /* Unless later overwritten by a matrix extension, we have the same
 372      * matrices for luminance and chrominance. */
 373     LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 374                 p_vpar->sequence.intra_quant.pi_matrix );
 375     LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
 376                 p_vpar->sequence.nonintra_quant.pi_matrix );
 377
 378     /*
 379      * Sequence Extension
 380      */
 381     NextStartCode( p_vpar );
 382     if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
 383     {
 384         int                         i_dummy;
 385         static f_chroma_pattern_t   ppf_chroma_pattern[4] =
 386                             {NULL, vpar_CodedPattern420,
 387                              vpar_CodedPattern422, vpar_CodedPattern444};
 388
 389         /* Turn the MPEG2 flag on */
 390         p_vpar->sequence.b_mpeg2 = 1;
 391
 392         /* Parse sequence_extension */
 393         RemoveBits32( &p_vpar->bit_stream );
 394         /* extension_start_code_identifier, profile_and_level_indication */
 395         RemoveBits( &p_vpar->bit_stream, 12 );
 396         p_vpar->sequence.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
 397         p_vpar->sequence.i_chroma_format = GetBits( &p_vpar->bit_stream, 2 );
 398         p_vpar->sequence.pf_decode_pattern = ppf_chroma_pattern
 399                                     [p_vpar->sequence.i_chroma_format];
 400         p_vpar->sequence.i_width |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
 401         p_vpar->sequence.i_height |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
 402         /* bit_rate_extension, marker_bit, vbv_buffer_size_extension, low_delay */
 403         RemoveBits( &p_vpar->bit_stream, 22 );
 404         /* frame_rate_extension_n */
 405         i_dummy = GetBits( &p_vpar->bit_stream, 2 );
 406         /* frame_rate_extension_d */
 407         p_vpar->sequence.r_frame_rate *= (i_dummy + 1)
 408                                   / (GetBits( &p_vpar->bit_stream, 5 ) + 1);
 409
 410         p_vpar->sequence.pf_decode_mv = vpar_MPEG2MotionVector;
 411     }
 412     else
 413     {
 414         /* It's an MPEG-1 stream. Put adequate parameters. */
 415
 416         p_vpar->sequence.b_mpeg2 = 0;
 417         p_vpar->sequence.b_progressive = 1;
 418         p_vpar->sequence.i_chroma_format = CHROMA_420;
 419         p_vpar->sequence.pf_decode_pattern = vpar_CodedPattern420;
 420
 421         p_vpar->sequence.pf_decode_mv = vpar_MPEG1MotionVector;
 422     }
 423
 424     /* Update sizes */
 425     p_vpar->sequence.i_mb_width = (p_vpar->sequence.i_width + 15) / 16;
 426     p_vpar->sequence.i_mb_height = (p_vpar->sequence.b_progressive) ?
 427                                    (p_vpar->sequence.i_height + 15) / 16 :
 428                                    2 * ((p_vpar->sequence.i_height + 31) / 32);
 429     p_vpar->sequence.i_mb_size = p_vpar->sequence.i_mb_width
 430                                         * p_vpar->sequence.i_mb_height;
 431     p_vpar->sequence.i_width = (p_vpar->sequence.i_mb_width * 16);
 432     p_vpar->sequence.i_height = (p_vpar->sequence.i_mb_height * 16);
 433     p_vpar->sequence.i_size = p_vpar->sequence.i_width
 434                                         * p_vpar->sequence.i_height;
 435
 436     /* Update chromatic information */
 437     switch( p_vpar->sequence.i_chroma_format )
 438     {
 439     case CHROMA_420:
 440         p_vpar->sequence.i_chroma_nb_blocks = 2;
 441         p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width >> 1;
 442         p_vpar->sequence.i_chroma_mb_width = 8;
 443         p_vpar->sequence.i_chroma_mb_height = 8;
 444         break;
 445
 446     case CHROMA_422:
 447         p_vpar->sequence.i_chroma_nb_blocks = 4;
 448         p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width >> 1;
 449         p_vpar->sequence.i_chroma_mb_width = 8;
 450         p_vpar->sequence.i_chroma_mb_height = 16;
 451         break;
 452
 453     case CHROMA_444:
 454         p_vpar->sequence.i_chroma_nb_blocks = 8;
 455         p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width;
 456         p_vpar->sequence.i_chroma_mb_width = 16;
 457         p_vpar->sequence.i_chroma_mb_height = 16;
 458     }
 459
 460     /* Slice Header functions */
 461     if( p_vpar->sequence.i_height <= 2800 )
 462     {
 463         if( p_vpar->sequence.i_scalable_mode != SC_DP )
 464         {
 465             p_vpar->sequence.pf_slice_header = SliceHeader00;
 466         }
 467         else
 468         {
 469             p_vpar->sequence.pf_slice_header = SliceHeader01;
 470         }
 471     }
 472     else
 473     {
 474         if( p_vpar->sequence.i_scalable_mode != SC_DP )
 475         {
 476             p_vpar->sequence.pf_slice_header = SliceHeader10;
 477         }
 478         else
 479         {
 480             p_vpar->sequence.pf_slice_header = SliceHeader11;
 481         }
 482     }
 483
 484     if(    p_vpar->sequence.i_width != i_width_save
 485         || p_vpar->sequence.i_height != i_height_save )
 486     {
 487          /* What do we do in case of a size change ??? */
 488     }
 489
 490     /* Extension and User data */
 491     ExtensionAndUserData( p_vpar );
 492 }
 493
 494 /*****************************************************************************
 495  * GroupHeader : Parse the next group of pictures header
 496  *****************************************************************************/
 497 static void GroupHeader( vpar_thread_t * p_vpar )
 498 {
 499     /* Nothing to do, we don't care. */
 500     RemoveBits( &p_vpar->bit_stream, 27 );
 501     ExtensionAndUserData( p_vpar );
 502 }
 503
 504 /*****************************************************************************
 505  * PictureHeader : Parse the next picture header
 506  *****************************************************************************/
 507 static void PictureHeader( vpar_thread_t * p_vpar )
 508 {
 509     static f_macroblock_type_t ppf_macroblock_type[5] = {NULL,
 510                                                   vpar_IMBType, vpar_PMBType,
 511                                                   vpar_BMBType, vpar_DMBType};
 512
 513     int                 i_structure;
 514     int                 i_mb_address, i_mb_base, i_mb;
 515     boolean_t           b_parsable;
 516     u32                 i_dummy;
 517
 518     RemoveBits( &p_vpar->bit_stream, 10 ); /* temporal_reference */
 519     p_vpar->picture.i_coding_type = GetBits( &p_vpar->bit_stream, 3 );
 520     p_vpar->picture.pf_macroblock_type = ppf_macroblock_type
 521                                          [p_vpar->picture.i_coding_type];
 522     RemoveBits( &p_vpar->bit_stream, 16 ); /* vbv_delay */
 523
 524     if( p_vpar->picture.i_coding_type == P_CODING_TYPE || p_vpar->picture.i_coding_type == B_CODING_TYPE )
 525     {
 526         p_vpar->picture.pb_full_pel_vector[0] = GetBits( &p_vpar->bit_stream, 1 );
 527         p_vpar->picture.i_forward_f_code = GetBits( &p_vpar->bit_stream, 3 );
 528     }
 529     if( p_vpar->picture.i_coding_type == B_CODING_TYPE )
 530     {
 531         p_vpar->picture.pb_full_pel_vector[1] = GetBits( &p_vpar->bit_stream, 1 );
 532         p_vpar->picture.i_backward_f_code = GetBits( &p_vpar->bit_stream, 3 );
 533     }
 534
 535     /* extra_information_picture */
 536     while( GetBits( &p_vpar->bit_stream, 1 ) )
 537     {
 538         RemoveBits( &p_vpar->bit_stream, 8 );
 539     }
 540
 541     /*
 542      * Picture Coding Extension
 543      */
 544     NextStartCode( p_vpar );
 545     if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
 546     {
 547         /* Parse picture_coding_extension */
 548         RemoveBits32( &p_vpar->bit_stream );
 549         /* extension_start_code_identifier */
 550         RemoveBits( &p_vpar->bit_stream, 4 );
 551
 552         p_vpar->picture.ppi_f_code[0][0] = GetBits( &p_vpar->bit_stream, 4 );
 553         p_vpar->picture.ppi_f_code[0][1] = GetBits( &p_vpar->bit_stream, 4 );
 554         p_vpar->picture.ppi_f_code[1][0] = GetBits( &p_vpar->bit_stream, 4 );
 555         p_vpar->picture.ppi_f_code[1][1] = GetBits( &p_vpar->bit_stream, 4 );
 556         p_vpar->picture.i_intra_dc_precision = GetBits( &p_vpar->bit_stream, 2 );
 557         i_structure = GetBits( &p_vpar->bit_stream, 2 );
 558         p_vpar->picture.b_top_field_first = GetBits( &p_vpar->bit_stream, 1 );
 559         p_vpar->picture.b_frame_pred_frame_dct
 560              = GetBits( &p_vpar->bit_stream, 1 );
 561         p_vpar->picture.b_concealment_mv = GetBits( &p_vpar->bit_stream, 1 );
 562         p_vpar->picture.b_q_scale_type = GetBits( &p_vpar->bit_stream, 1 );
 563         p_vpar->picture.b_intra_vlc_format = GetBits( &p_vpar->bit_stream, 1 );
 564         p_vpar->picture.b_alternate_scan = GetBits( &p_vpar->bit_stream, 1 );
 565         p_vpar->picture.b_repeat_first_field = GetBits( &p_vpar->bit_stream, 1 );
 566         /* repeat_first_field (ISO/IEC 13818-2 6.3.10 is necessary to know
 567          * the length of the picture_display_extension structure.
 568          * chroma_420_type (obsolete) */
 569         RemoveBits( &p_vpar->bit_stream, 1 );
 570         p_vpar->picture.b_progressive_frame = GetBits( &p_vpar->bit_stream, 1 );
 571
 572         /* composite_display_flag */
 573         if( GetBits( &p_vpar->bit_stream, 1 ) )
 574         {
 575             /* v_axis, field_sequence, sub_carrier, burst_amplitude,
 576              * sub_carrier_phase */
 577             RemoveBits( &p_vpar->bit_stream, 20 );
 578         }
 579     }
 580     else
 581     {
 582         /* MPEG-1 compatibility flags */
 583         p_vpar->picture.i_intra_dc_precision = 0; /* 8 bits */
 584         i_structure = FRAME_STRUCTURE;
 585         p_vpar->picture.b_frame_pred_frame_dct = 1;
 586         p_vpar->picture.b_concealment_mv = 0;
 587         p_vpar->picture.b_q_scale_type = 0;
 588         p_vpar->picture.b_intra_vlc_format = 0;
 589         p_vpar->picture.b_alternate_scan = 0; /* zigzag */
 590         p_vpar->picture.b_repeat_first_field = 0;
 591         p_vpar->picture.b_progressive_frame = 1;
 592     }
 593
 594     if( p_vpar->picture.i_current_structure &&
 595         (i_structure == FRAME_STRUCTURE ||
 596          i_structure == p_vpar->picture.i_current_structure) )
 597     {
 598         /* We don't have the second field of the buffered frame. */
 599         if( p_vpar->picture.p_picture != NULL )
 600         {
 601             ReferenceReplace( p_vpar,
 602                       p_vpar->picture.i_coding_type,
 603                       NULL );
 604
 605             for( i_mb = 0; i_mb < p_vpar->sequence.i_mb_size >> 1; i_mb++ )
 606             {
 607                 vpar_DestroyMacroblock( &p_vpar->vfifo,
 608                                         p_vpar->picture.pp_mb[i_mb] );
 609             }
 610             vout_DestroyPicture( p_vpar->p_vout, p_vpar->picture.p_picture );
 611         }
 612
 613         p_vpar->picture.i_current_structure = 0;
 614
 615         intf_DbgMsg("vpar debug: odd number of field picture.\n");
 616     }
 617
 618     /* Do we have the reference pictures ? */
 619     b_parsable = !(((p_vpar->picture.i_coding_type == P_CODING_TYPE) &&
 620                     (p_vpar->sequence.p_backward == NULL)) ||
 621                      /* p_backward will become p_forward later */
 622                    ((p_vpar->picture.i_coding_type == B_CODING_TYPE) &&
 623                     (p_vpar->sequence.p_forward == NULL ||
 624                      p_vpar->sequence.p_backward == NULL)));
 625
 626     if( b_parsable )
 627     {
 628         if( p_vpar->picture.i_current_structure )
 629         {
 630             /* Second field of a frame. We will decode it if, and only if we
 631             * have decoded the first frame. */
 632             b_parsable = (p_vpar->picture.p_picture != NULL);
 633         }
 634         else
 635         {
 636             /* Does synchro say we have enough time to decode it ? */
 637             b_parsable = vpar_SynchroChoose( p_vpar,
 638                                p_vpar->picture.i_coding_type, i_structure );
 639         }
 640     }
 641
 642     if( !b_parsable )
 643     {
 644         /* Update the reference pointers. */
 645         ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, NULL );
 646
 647         /* Warn Synchro we have trashed a picture. */
 648         vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
 649
 650         /* Update context. */
 651         if( i_structure != FRAME_STRUCTURE )
 652             p_vpar->picture.i_current_structure = i_structure;
 653         p_vpar->picture.p_picture = NULL;
 654
 655         return;
 656     }
 657
 658     /* OK, now we are sure we will decode the picture. */
 659 #define P_picture p_vpar->picture.p_picture
 660     p_vpar->picture.b_error = 0;
 661
 662     if( !p_vpar->picture.i_current_structure )
 663     {
 664         /* This is a new frame. Get a structure from the video_output. */
 665         while( ( P_picture = vout_CreatePicture( p_vpar->p_vout,
 666                                         99+p_vpar->sequence.i_chroma_format, /*???*/
 667                                         p_vpar->sequence.i_width,
 668                                         p_vpar->sequence.i_height ) )
 669              == NULL )
 670         {
 671             intf_ErrMsg("vpar debug: allocation error in vout_CreatePicture\n");
 672             if( p_vpar->b_die )
 673             {
 674                 return;
 675             }
 676             mwait( VPAR_IDLE_SLEEP );
 677         }
 678
 679         /* Initialize values. */
 680         P_picture->date = vpar_SynchroDecode( p_vpar,
 681                                               p_vpar->picture.i_coding_type,
 682                                               i_structure );
 683         P_picture->i_aspect_ratio = p_vpar->sequence.i_aspect_ratio;
 684         P_picture->i_matrix_coefficients = p_vpar->sequence.i_matrix_coefficients;
 685         p_vpar->picture.i_l_stride = ( p_vpar->sequence.i_width
 686                     << ( 1 - p_vpar->picture.b_frame_structure ) );
 687         p_vpar->picture.i_c_stride = ( p_vpar->sequence.i_chroma_width
 688                     << ( 1 - p_vpar->picture.b_frame_structure ));
 689
 690         P_picture->i_deccount = p_vpar->sequence.i_mb_size;
 691         memset( p_vpar->picture.pp_mb, 0, MAX_MB );
 692 memset( P_picture->p_data, 0, (p_vpar->sequence.i_mb_size*384));
 693
 694         /* Update the reference pointers. */
 695         ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, P_picture );
 696     }
 697     p_vpar->picture.i_current_structure |= i_structure;
 698     p_vpar->picture.i_structure = i_structure;
 699     p_vpar->picture.b_frame_structure = (i_structure == FRAME_STRUCTURE);
 700
 701     /* Initialize picture data for decoding. */
 702     if( p_vpar->picture.b_motion_field = (i_structure == BOTTOM_FIELD) )
 703     {
 704         i_mb_base = p_vpar->sequence.i_mb_size >> 1;
 705         p_vpar->mb.i_l_y = 1;
 706         p_vpar->mb.i_c_y = 1;
 707     }
 708     else
 709     {
 710         i_mb_base = 0;
 711         p_vpar->mb.i_l_y = p_vpar->mb.i_c_y = 0;
 712     }
 713     i_mb_address = 0;
 714     p_vpar->mb.i_l_x = p_vpar->mb.i_c_x = 0;
 715
 716     /* Extension and User data. */
 717     ExtensionAndUserData( p_vpar );
 718
 719     /* Picture data (ISO/IEC 13818-2 6.2.3.7). */
 720     NextStartCode( p_vpar );
 721     while( i_mb_address+i_mb_base < p_vpar->sequence.i_mb_size
 722            && !p_vpar->picture.b_error && !p_vpar->b_die )
 723     {
 724         if( ((i_dummy = ShowBits( &p_vpar->bit_stream, 32 ))
 725                  < SLICE_START_CODE_MIN) ||
 726             (i_dummy > SLICE_START_CODE_MAX) )
 727         {
 728             intf_DbgMsg("vpar debug: premature end of picture\n");
 729             p_vpar->picture.b_error = 1;
 730             break;
 731         }
 732         RemoveBits32( &p_vpar->bit_stream );
 733
 734         /* Decode slice data. */
 735         p_vpar->sequence.pf_slice_header( p_vpar, &i_mb_address, i_mb_base, i_dummy & 255 );
 736     }
 737
 738     if( p_vpar->picture.b_error )
 739     {
 740         /* Trash picture. */
 741 fprintf(stderr, "Image trashee\n");
 742         for( i_mb = 1; p_vpar->picture.pp_mb[i_mb]; i_mb++ )
 743         {
 744             vpar_DestroyMacroblock( &p_vpar->vfifo, p_vpar->picture.pp_mb[i_mb] );
 745         }
 746         vout_DestroyPicture( p_vpar->p_vout, p_vpar->picture.p_picture );
 747
 748         ReferenceReplace( p_vpar, p_vpar->picture.i_coding_type, NULL );
 749
 750         /* Prepare context for the next picture. */
 751         P_picture = NULL;
 752         if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
 753             p_vpar->picture.i_current_structure = 0;
 754     }
 755     else if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
 756     {
 757 fprintf(stderr, "Image parsee (%d)\n", p_vpar->picture.i_coding_type);
 758         /* Frame completely parsed. */
 759         for( i_mb = 1; p_vpar->picture.pp_mb[i_mb]; i_mb++ )
 760         {
 761             vpar_DecodeMacroblock( &p_vpar->vfifo, p_vpar->picture.pp_mb[i_mb] );
 762         }
 763
 764         /* Link referenced pictures for the decoder
 765          * They are unlinked in vpar_ReleaseMacroblock() & vpar_DestroyMacroblock() */
 766         if( p_vpar->picture.i_coding_type == P_CODING_TYPE ||
 767             p_vpar->picture.i_coding_type == B_CODING_TYPE )
 768         {
 769             vout_LinkPicture( p_vpar->p_vout, p_vpar->sequence.p_forward );
 770         }
 771         if( p_vpar->picture.i_coding_type == B_CODING_TYPE )
 772         {
 773             vout_LinkPicture( p_vpar->p_vout, p_vpar->sequence.p_backward );
 774         }
 775
 776         /* Send signal to the video_decoder. */
 777         vlc_mutex_lock( &p_vpar->vfifo.lock );
 778         vlc_cond_signal( &p_vpar->vfifo.wait );
 779         vlc_mutex_unlock( &p_vpar->vfifo.lock );
 780
 781         /* Prepare context for the next picture. */
 782         P_picture = NULL;
 783         p_vpar->picture.i_current_structure = 0;
 784     }
 785 #undef P_picture
 786 }
 787
 788 /*****************************************************************************
 789  * SliceHeader : Parse the next slice structure
 790  *****************************************************************************/
 791 static __inline__ void SliceHeader( vpar_thread_t * p_vpar,
 792                                     int * pi_mb_address, int i_mb_base,
 793                                     u32 i_vert_code )
 794 {
 795     /* DC predictors initialization table */
 796     static int              pi_dc_dct_reinit[4] = {128,256,512,1024};
 797
 798     int                     i_mb_address_save = *pi_mb_address;
 799
 800     /* slice_vertical_position_extension and priority_breakpoint already done */
 801     LoadQuantizerScale( p_vpar );
 802
 803     if( GetBits( &p_vpar->bit_stream, 1 ) )
 804     {
 805         /* intra_slice, slice_id */
 806         RemoveBits( &p_vpar->bit_stream, 8 );
 807         /* extra_information_slice */
 808         while( GetBits( &p_vpar->bit_stream, 1 ) )
 809         {
 810             RemoveBits( &p_vpar->bit_stream, 8 );
 811         }
 812     }
 813     *pi_mb_address = (i_vert_code - 1)*p_vpar->sequence.i_mb_width;
 814
 815     /* Reset DC coefficients predictors (ISO/IEC 13818-2 7.2.1). Why
 816      * does the reference decoder put 0 instead of the normative values ? */
 817     p_vpar->slice.pi_dc_dct_pred[0] = p_vpar->slice.pi_dc_dct_pred[1]
 818         = p_vpar->slice.pi_dc_dct_pred[2]
 819         = pi_dc_dct_reinit[p_vpar->picture.i_intra_dc_precision];
 820
 821     /* Reset motion vector predictors (ISO/IEC 13818-2 7.6.3.4). */
 822     memset( p_vpar->slice.pppi_pmv, 0, 8*sizeof(int) );
 823
 824     do
 825     {
 826         vpar_ParseMacroblock( p_vpar, pi_mb_address, i_mb_address_save,
 827                               i_mb_base );
 828         i_mb_address_save = *pi_mb_address;
 829     }
 830     while( ShowBits( &p_vpar->bit_stream, 23 ) && !p_vpar->b_die );
 831     NextStartCode( p_vpar );
 832 }
 833
 834 /*****************************************************************************
 835  * SliceHeaderXY : Parse the next slice structure
 836  *****************************************************************************
 837  * X = i_height > 2800 ?
 838  * Y = scalable_mode == SC_DP ?
 839  *****************************************************************************/
 840 static void SliceHeader00( vpar_thread_t * p_vpar,
 841                            int * pi_mb_address, int i_mb_base,
 842                            u32 i_vert_code )
 843 {
 844     SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
 845 }
 846
 847 static void SliceHeader01( vpar_thread_t * p_vpar,
 848                            int * pi_mb_address, int i_mb_base,
 849                            u32 i_vert_code )
 850 {
 851     RemoveBits( &p_vpar->bit_stream, 7 ); /* priority_breakpoint */
 852     SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
 853 }
 854
 855 static void SliceHeader10( vpar_thread_t * p_vpar,
 856                            int * pi_mb_address, int i_mb_base,
 857                            u32 i_vert_code )
 858 {
 859     i_vert_code += GetBits( &p_vpar->bit_stream, 3 ) << 7;
 860     SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
 861 }
 862
 863 static void SliceHeader11( vpar_thread_t * p_vpar,
 864                            int * pi_mb_address, int i_mb_base,
 865                            u32 i_vert_code )
 866 {
 867     i_vert_code += GetBits( &p_vpar->bit_stream, 3 ) << 7;
 868     RemoveBits( &p_vpar->bit_stream, 7 ); /* priority_breakpoint */
 869     SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
 870 }
 871
 872 /*****************************************************************************
 873  * ExtensionAndUserData : Parse the extension_and_user_data structure
 874  *****************************************************************************/
 875 static void ExtensionAndUserData( vpar_thread_t * p_vpar )
 876 {
 877     while( !p_vpar->b_die )
 878     {
 879         NextStartCode( p_vpar );
 880         switch( ShowBits( &p_vpar->bit_stream, 32 ) )
 881         {
 882         case EXTENSION_START_CODE:
 883             RemoveBits32( &p_vpar->bit_stream );
 884             switch( GetBits( &p_vpar->bit_stream, 4 ) )
 885             {
 886             case SEQUENCE_DISPLAY_EXTENSION_ID:
 887                 SequenceDisplayExtension( p_vpar );
 888                 break;
 889             case QUANT_MATRIX_EXTENSION_ID:
 890                 QuantMatrixExtension( p_vpar );
 891                 break;
 892             case SEQUENCE_SCALABLE_EXTENSION_ID:
 893                 SequenceScalableExtension( p_vpar );
 894                 break;
 895             case PICTURE_DISPLAY_EXTENSION_ID:
 896                 PictureDisplayExtension( p_vpar );
 897                 break;
 898             case PICTURE_SPATIAL_SCALABLE_EXTENSION_ID:
 899                 PictureSpatialScalableExtension( p_vpar );
 900                 break;
 901             case PICTURE_TEMPORAL_SCALABLE_EXTENSION_ID:
 902                 PictureTemporalScalableExtension( p_vpar );
 903                 break;
 904             case COPYRIGHT_EXTENSION_ID:
 905                 CopyrightExtension( p_vpar );
 906                 break;
 907             default:
 908             }
 909             break;
 910
 911         case USER_DATA_START_CODE:
 912             RemoveBits32( &p_vpar->bit_stream );
 913             /* Wait for the next start code */
 914             break;
 915
 916         default:
 917             return;
 918         }
 919     }
 920 }
 921
 922
 923 /*****************************************************************************
 924  * SequenceDisplayExtension : Parse the sequence_display_extension structure *
 925  *****************************************************************************/
 926
 927 static void SequenceDisplayExtension( vpar_thread_t * p_vpar )
 928 {
 929     /* We don't care sequence_display_extension. */
 930     /* video_format */
 931     RemoveBits( &p_vpar->bit_stream, 3 );
 932     if( GetBits( &p_vpar->bit_stream, 1 ) )
 933     {
 934         /* Two bytes for color_desciption */
 935         RemoveBits( &p_vpar->bit_stream, 16 );
 936         p_vpar->sequence.i_matrix_coefficients = GetBits( &p_vpar->bit_stream, 8 );
 937     }
 938     /* display_horizontal and vertical_size and a marker_bit */
 939     RemoveBits( &p_vpar->bit_stream, 29 );
 940 }
 941
 942
 943 /*****************************************************************************
 944  * QuantMatrixExtension : Load quantization matrices for luminance           *
 945  *                        and chrominance                                    *
 946  *****************************************************************************/
 947
 948 static void QuantMatrixExtension( vpar_thread_t * p_vpar )
 949 {
 950     if( GetBits( &p_vpar->bit_stream, 1 ) )
 951     {
 952         /* Load intra_quantiser_matrix for luminance. */
 953         LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
 954     }
 955     else
 956     {
 957         /* Use the default matrix. */
 958         LinkMatrix( &p_vpar->sequence.intra_quant,
 959                     pi_default_intra_quant );
 960     }
 961     if( GetBits( &p_vpar->bit_stream, 1 ) )
 962     {
 963         /* Load non_intra_quantiser_matrix for luminance. */
 964         LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
 965     }
 966     else
 967     {
 968         /* Use the default matrix. */
 969         LinkMatrix( &p_vpar->sequence.nonintra_quant,
 970                     pi_default_nonintra_quant );
 971     }
 972     if( GetBits( &p_vpar->bit_stream, 1 ) )
 973     {
 974         /* Load intra_quantiser_matrix for chrominance. */
 975         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_intra_quant );
 976     }
 977     else
 978     {
 979         /* Link the chrominance intra matrix to the luminance one. */
 980         LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 981                     p_vpar->sequence.intra_quant.pi_matrix );
 982     }
 983     if( GetBits( &p_vpar->bit_stream, 1 ) )
 984     {
 985         /* Load non_intra_quantiser_matrix for chrominance. */
 986         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
 987     }
 988     else
 989     {
 990         /* Link the chrominance intra matrix to the luminance one. */
 991         LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 992                     p_vpar->sequence.intra_quant.pi_matrix );
 993     }
 994     if( GetBits( &p_vpar->bit_stream, 1 ) )
 995     {
 996         /* Load non_intra_quantiser_matrix for chrominance. */
 997         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
 998     }
 999     else
1000     {
1001         /* Link the chrominance nonintra matrix to the luminance one. */
1002         LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
1003                     p_vpar->sequence.nonintra_quant.pi_matrix );
1004     }
1005 }
1006
1007
1008 /*****************************************************************************
1009  * SequenceScalableExtension : Parse the sequence_scalable_extension         *
1010  *                             structure to handle scalable coding           *
1011  *****************************************************************************/
1012
1013 static void SequenceScalableExtension( vpar_thread_t * p_vpar )
1014 {
1015     /* We don't care about anything scalable except the scalable mode. */
1016     switch( p_vpar->sequence.i_scalable_mode = GetBits( &p_vpar->bit_stream, 2 ) )
1017     /* The length of the structure depends on the value of the scalable_mode */
1018     {
1019         case 1:
1020             RemoveBits32( &p_vpar->bit_stream );
1021             RemoveBits( &p_vpar->bit_stream, 21 );
1022             break;
1023         case 2:
1024             RemoveBits( &p_vpar->bit_stream, 12 );
1025             break;
1026         default:
1027             RemoveBits( &p_vpar->bit_stream, 4 );
1028     }
1029
1030 }
1031 /*****************************************************************************
1032  * PictureDisplayExtension : Parse the picture_display_extension structure   *
1033  *****************************************************************************/
1034
1035 static void PictureDisplayExtension( vpar_thread_t * p_vpar )
1036 {
1037     /* Number of frame center offset */
1038     int nb;
1039     /* I am not sure it works but it should
1040         (fewer tests than shown in §6.3.12) */
1041     nb = p_vpar->sequence.b_progressive ? p_vpar->sequence.b_progressive +
1042                                           p_vpar->picture.b_repeat_first_field +
1043                                           p_vpar->picture.b_top_field_first
1044                          : ( p_vpar->picture.b_frame_structure + 1 ) +
1045                            p_vpar->picture.b_repeat_first_field;
1046     RemoveBits( &p_vpar->bit_stream, 34 * nb );
1047 }
1048
1049
1050 /*****************************************************************************
1051  * PictureSpatialScalableExtension                                           *
1052  *****************************************************************************/
1053
1054 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar )
1055 {
1056     /* That's scalable, so we trash it */
1057     RemoveBits32( &p_vpar->bit_stream );
1058     RemoveBits( &p_vpar->bit_stream, 16 );
1059 }
1060
1061
1062 /*****************************************************************************
1063  * PictureTemporalScalableExtension                                          *
1064  *****************************************************************************/
1065
1066 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar )
1067 {
1068     /* Scalable again, trashed again */
1069     RemoveBits( &p_vpar->bit_stream, 23 );
1070 }
1071
1072
1073 /*****************************************************************************
1074  * CopyrightExtension : Keeps some legal informations                        *
1075  *****************************************************************************/
1076
1077 static void CopyrightExtension( vpar_thread_t * p_vpar )
1078 {
1079     u32     i_copyright_nb_1, i_copyright_nb_2; /* local integers */
1080     p_vpar->sequence.b_copyright_flag = GetBits( &p_vpar->bit_stream, 1 );
1081         /* A flag that says whether the copyright information is significant */
1082     p_vpar->sequence.i_copyright_id = GetBits( &p_vpar->bit_stream, 8 );
1083         /* An identifier compliant with ISO/CEI JTC 1/SC 29 */
1084     p_vpar->sequence.b_original = GetBits( &p_vpar->bit_stream, 1 );
1085         /* Reserved bits */
1086     RemoveBits( &p_vpar->bit_stream, 8 );
1087         /* The copyright_number is split in three parts */
1088         /* first part */
1089     i_copyright_nb_1 = GetBits( &p_vpar->bit_stream, 20 );
1090     RemoveBits( &p_vpar->bit_stream, 1 );
1091         /* second part */
1092     i_copyright_nb_2 = GetBits( &p_vpar->bit_stream, 22 );
1093     RemoveBits( &p_vpar->bit_stream, 1 );
1094         /* third part and sum */
1095     p_vpar->sequence.i_copyright_nb = ( (u64)i_copyright_nb_1 << 44 ) +
1096                                       ( (u64)i_copyright_nb_2 << 22 ) +
1097                                       ( (u64)GetBits( &p_vpar->bit_stream, 22 ) );
1098 }