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

   1 /*****************************************************************************
   2  * vpar_headers.c : headers parsing
   3  *****************************************************************************
   4  * Copyright (C) 1999, 2000 VideoLAN
   5  * $Id: vpar_headers.c,v 1.80 2001/03/02 13:20:29 massiot Exp $
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *          Stéphane Borel <stef@via.ecp.fr>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include "defs.h"
  29
  30 #include <stdlib.h>                                                /* free() */
  31
  32 #include "config.h"
  33 #include "common.h"
  34 #include "threads.h"
  35 #include "mtime.h"
  36
  37 #include "intf_msg.h"
  38
  39 #include "stream_control.h"
  40 #include "input_ext-dec.h"
  41
  42 #include "video.h"
  43 #include "video_output.h"
  44
  45 #include "video_decoder.h"
  46 #include "vdec_motion.h"
  47 #include "../video_decoder/vdec_idct.h"
  48
  49 #include "vpar_blocks.h"
  50 #include "../video_decoder/vpar_headers.h"
  51 #include "../video_decoder/vpar_synchro.h"
  52 #include "../video_decoder/video_parser.h"
  53 #include "../video_decoder/video_fifo.h"
  54
  55 /*
  56  * Local prototypes
  57  */
  58 static __inline__ void NextStartCode( bit_stream_t * );
  59 static void SequenceHeader( vpar_thread_t * p_vpar );
  60 static void GroupHeader( vpar_thread_t * p_vpar );
  61 static void PictureHeader( vpar_thread_t * p_vpar );
  62 static void ExtensionAndUserData( vpar_thread_t * p_vpar );
  63 static void QuantMatrixExtension( vpar_thread_t * p_vpar );
  64 static void SequenceScalableExtension( vpar_thread_t * p_vpar );
  65 static void SequenceDisplayExtension( vpar_thread_t * p_vpar );
  66 static void PictureDisplayExtension( vpar_thread_t * p_vpar );
  67 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar );
  68 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar );
  69 static void CopyrightExtension( vpar_thread_t * p_vpar );
  70
  71 /*
  72  * Standard variables
  73  */
  74
  75 /*****************************************************************************
  76  * pi_default_intra_quant : default quantization matrix
  77  *****************************************************************************/
  78 u8 pi_default_intra_quant[] =
  79 {
  80     8,  16, 19, 22, 26, 27, 29, 34,
  81     16, 16, 22, 24, 27, 29, 34, 37,
  82     19, 22, 26, 27, 29, 34, 34, 38,
  83     22, 22, 26, 27, 29, 34, 37, 40,
  84     22, 26, 27, 29, 32, 35, 40, 48,
  85     26, 27, 29, 32, 35, 40, 48, 58,
  86     26, 27, 29, 34, 38, 46, 56, 69,
  87     27, 29, 35, 38, 46, 56, 69, 83
  88 };
  89
  90 /*****************************************************************************
  91  * pi_default_nonintra_quant : default quantization matrix
  92  *****************************************************************************/
  93 u8 pi_default_nonintra_quant[] =
  94 {
  95     16, 16, 16, 16, 16, 16, 16, 16,
  96     16, 16, 16, 16, 16, 16, 16, 16,
  97     16, 16, 16, 16, 16, 16, 16, 16,
  98     16, 16, 16, 16, 16, 16, 16, 16,
  99     16, 16, 16, 16, 16, 16, 16, 16,
 100     16, 16, 16, 16, 16, 16, 16, 16,
 101     16, 16, 16, 16, 16, 16, 16, 16,
 102     16, 16, 16, 16, 16, 16, 16, 16
 103 };
 104
 105 /*****************************************************************************
 106  * pi_scan : zig-zag and alternate scan patterns
 107  *****************************************************************************/
 108 u8 pi_scan[2][64] =
 109 {
 110     { /* Zig-Zag pattern */
 111         0,1,8,16,9,2,3,10,17,24,32,25,18,11,4,5,
 112         12,19,26,33,40,48,41,34,27,20,13,6,7,14,21,28,
 113         35,42,49,56,57,50,43,36,29,22,15,23,30,37,44,51,
 114         58,59,52,45,38,31,39,46,53,60,61,54,47,55,62,63
 115     },
 116     { /* Alternate scan pattern */
 117         0,8,16,24,1,9,2,10,17,25,32,40,48,56,57,49,
 118         41,33,26,18,3,11,4,12,19,27,34,42,50,58,35,43,
 119         51,59,20,28,5,13,6,14,21,29,36,44,52,60,37,45,
 120         53,61,22,30,7,15,23,31,38,46,54,62,39,47,55,63
 121     }
 122 };
 123
 124 /*
 125  * Local inline functions.
 126  */
 127
 128 /*****************************************************************************
 129  * ReferenceUpdate : Update the reference pointers when we have a new picture
 130  *****************************************************************************/
 131 static void __inline__ ReferenceUpdate( vpar_thread_t * p_vpar,
 132                                         int i_coding_type,
 133                                         picture_t * p_newref )
 134 {
 135     if( i_coding_type != B_CODING_TYPE )
 136     {
 137         if( p_vpar->sequence.p_forward != NULL )
 138         {
 139             vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_forward );
 140         }
 141         if( p_vpar->sequence.p_backward != NULL )
 142         {
 143             vout_DatePicture( p_vpar->p_vout, p_vpar->sequence.p_backward,
 144                               vpar_SynchroDate( p_vpar ) );
 145         }
 146         p_vpar->sequence.p_forward = p_vpar->sequence.p_backward;
 147         p_vpar->sequence.p_backward = p_newref;
 148         if( p_newref != NULL )
 149         {
 150             vout_LinkPicture( p_vpar->p_vout, p_newref );
 151         }
 152     }
 153     else if( p_newref != NULL )
 154     {
 155         /* Put date immediately. */
 156         vout_DatePicture( p_vpar->p_vout, p_newref, vpar_SynchroDate(p_vpar) );
 157     }
 158 }
 159
 160 /*****************************************************************************
 161  * ReferenceReplace : Replace the last reference pointer when we destroy
 162  *                    a picture
 163  *****************************************************************************/
 164 static void __inline__ ReferenceReplace( vpar_thread_t * p_vpar,
 165                                          int i_coding_type,
 166                                          picture_t * p_newref )
 167 {
 168     if( i_coding_type != B_CODING_TYPE )
 169     {
 170         if( p_vpar->sequence.p_backward != NULL )
 171         {
 172             vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_backward );
 173         }
 174         p_vpar->sequence.p_backward = p_newref;
 175         if( p_newref != NULL )
 176         {
 177             vout_LinkPicture( p_vpar->p_vout, p_newref );
 178         }
 179     }
 180 }
 181
 182 /*****************************************************************************
 183  * LoadMatrix : Load a quantization matrix
 184  *****************************************************************************/
 185 static __inline__ void LoadMatrix( vpar_thread_t * p_vpar,
 186                                    quant_matrix_t * p_matrix )
 187 {
 188     int i_dummy;
 189
 190     if( !p_matrix->b_allocated )
 191     {
 192         /* Allocate a piece of memory to load the matrix. */
 193         if( (p_matrix->pi_matrix = (u8 *)malloc( 64*sizeof(u8) )) == NULL )
 194         {
 195             intf_ErrMsg( "vpar error: allocation error in LoadMatrix()" );
 196             p_vpar->p_fifo->b_error = 1;
 197             return;
 198         }
 199         p_matrix->b_allocated = 1;
 200     }
 201
 202     for( i_dummy = 0; i_dummy < 64; i_dummy++ )
 203     {
 204         p_matrix->pi_matrix[p_vpar->ppi_scan[SCAN_ZIGZAG][i_dummy]]
 205              = GetBits( &p_vpar->bit_stream, 8 );
 206     }
 207
 208 #ifdef VDEC_DFT
 209     /* Discrete Fourier Transform requires the quantization matrices to
 210      * be normalized before using them. */
 211     vdec_NormQuantMatrix( p_matrix->pi_matrix );
 212 #endif
 213 }
 214
 215 /*****************************************************************************
 216  * LinkMatrix : Link a quantization matrix to another
 217  *****************************************************************************/
 218 static __inline__ void LinkMatrix( quant_matrix_t * p_matrix, u8 * pi_array )
 219 {
 220     if( p_matrix->b_allocated )
 221     {
 222         /* Deallocate the piece of memory. */
 223         free( p_matrix->pi_matrix );
 224         p_matrix->b_allocated = 0;
 225     }
 226
 227     p_matrix->pi_matrix = pi_array;
 228 }
 229
 230 /*
 231  * Exported functions.
 232  */
 233
 234 /*****************************************************************************
 235  * vpar_NextSequenceHeader : Find the next sequence header
 236  *****************************************************************************/
 237 int vpar_NextSequenceHeader( vpar_thread_t * p_vpar )
 238 {
 239     while( !p_vpar->p_fifo->b_die )
 240     {
 241         NextStartCode( &p_vpar->bit_stream );
 242         if( ShowBits( &p_vpar->bit_stream, 32 ) == SEQUENCE_HEADER_CODE )
 243         {
 244             return 0;
 245         }
 246         RemoveBits( &p_vpar->bit_stream, 8 );
 247     }
 248     return 1;
 249 }
 250
 251 /*****************************************************************************
 252  * vpar_ParseHeader : Parse the next header
 253  *****************************************************************************/
 254 int vpar_ParseHeader( vpar_thread_t * p_vpar )
 255 {
 256     while( !p_vpar->p_fifo->b_die )
 257     {
 258         NextStartCode( &p_vpar->bit_stream );
 259         switch( GetBits32( &p_vpar->bit_stream ) )
 260         {
 261         case SEQUENCE_HEADER_CODE:
 262 #ifdef STATS
 263             p_vpar->c_sequences++;
 264 #endif
 265             SequenceHeader( p_vpar );
 266             return 0;
 267             break;
 268
 269         case GROUP_START_CODE:
 270             GroupHeader( p_vpar );
 271             return 0;
 272             break;
 273
 274         case PICTURE_START_CODE:
 275             PictureHeader( p_vpar );
 276             return 0;
 277             break;
 278
 279         case SEQUENCE_END_CODE:
 280             intf_DbgMsg("vpar debug: sequence end code received");
 281             return 1;
 282             break;
 283
 284         default:
 285         }
 286     }
 287
 288     return 0;
 289 }
 290
 291 /*
 292  * Following functions are local
 293  */
 294
 295 /*****************************************************************************
 296  * SequenceHeader : Parse the next sequence header
 297  *****************************************************************************/
 298 static void SequenceHeader( vpar_thread_t * p_vpar )
 299 {
 300 #define RESERVED    -1
 301     static int i_frame_rate_table[16] =
 302     {
 303         0,
 304         23 * 1000,
 305         24 * 1001,
 306         25 * 1001,
 307         30 * 1000,
 308         30 * 1001,
 309         50 * 1001,
 310         60 * 1000,
 311         60 * 1001,
 312         RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED
 313     };
 314 #undef RESERVED
 315
 316     int i_height_save, i_width_save;
 317
 318     i_height_save = p_vpar->sequence.i_height;
 319     i_width_save = p_vpar->sequence.i_width;
 320
 321     p_vpar->sequence.i_width = GetBits( &p_vpar->bit_stream, 12 );
 322     p_vpar->sequence.i_height = GetBits( &p_vpar->bit_stream, 12 );
 323     p_vpar->sequence.i_aspect_ratio = GetBits( &p_vpar->bit_stream, 4 );
 324     p_vpar->sequence.i_frame_rate =
 325             i_frame_rate_table[ GetBits( &p_vpar->bit_stream, 4 ) ];
 326
 327     /* We don't need bit_rate_value, marker_bit, vbv_buffer_size,
 328      * constrained_parameters_flag */
 329     RemoveBits( &p_vpar->bit_stream, 30 );
 330
 331     /*
 332      * Quantization matrices
 333      */
 334     if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_intra_quantizer_matrix */
 335     {
 336         LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
 337     }
 338     else
 339     {
 340         /* Use default matrix. */
 341         LinkMatrix( &p_vpar->sequence.intra_quant,
 342                     p_vpar->pi_default_intra_quant );
 343     }
 344
 345     if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_non_intra_quantizer_matrix */
 346     {
 347         LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
 348     }
 349     else
 350     {
 351         /* Use default matrix. */
 352         LinkMatrix( &p_vpar->sequence.nonintra_quant,
 353                     p_vpar->pi_default_nonintra_quant );
 354     }
 355
 356     /* Unless later overwritten by a matrix extension, we have the same
 357      * matrices for luminance and chrominance. */
 358     LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 359                 p_vpar->sequence.intra_quant.pi_matrix );
 360     LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
 361                 p_vpar->sequence.nonintra_quant.pi_matrix );
 362
 363     /*
 364      * Sequence Extension
 365      */
 366     NextStartCode( &p_vpar->bit_stream );
 367     if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
 368     {
 369         int                         i_dummy;
 370
 371         /* Turn the MPEG2 flag on */
 372         p_vpar->sequence.b_mpeg2 = 1;
 373
 374         /* Parse sequence_extension */
 375         RemoveBits32( &p_vpar->bit_stream );
 376         /* extension_start_code_identifier, profile_and_level_indication */
 377         RemoveBits( &p_vpar->bit_stream, 12 );
 378         p_vpar->sequence.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
 379         p_vpar->sequence.i_chroma_format = GetBits( &p_vpar->bit_stream, 2 );
 380         p_vpar->sequence.i_width |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
 381         p_vpar->sequence.i_height |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
 382         /* bit_rate_extension, marker_bit, vbv_buffer_size_extension, low_delay */
 383         RemoveBits( &p_vpar->bit_stream, 22 );
 384         /* frame_rate_extension_n */
 385         i_dummy = GetBits( &p_vpar->bit_stream, 2 );
 386         /* frame_rate_extension_d */
 387         p_vpar->sequence.i_frame_rate *= (i_dummy + 1)
 388                                   / (GetBits( &p_vpar->bit_stream, 5 ) + 1);
 389     }
 390     else
 391     {
 392         /* It's an MPEG-1 stream. Put adequate parameters. */
 393
 394         p_vpar->sequence.b_mpeg2 = 0;
 395         p_vpar->sequence.b_progressive = 1;
 396         p_vpar->sequence.i_chroma_format = CHROMA_420;
 397     }
 398
 399     /* Update sizes */
 400     p_vpar->sequence.i_mb_width = (p_vpar->sequence.i_width + 15) / 16;
 401     p_vpar->sequence.i_mb_height = (p_vpar->sequence.b_progressive) ?
 402                                    (p_vpar->sequence.i_height + 15) / 16 :
 403                                    2 * ((p_vpar->sequence.i_height + 31) / 32);
 404     p_vpar->sequence.i_mb_size = p_vpar->sequence.i_mb_width
 405                                         * p_vpar->sequence.i_mb_height;
 406     p_vpar->sequence.i_width = (p_vpar->sequence.i_mb_width * 16);
 407     p_vpar->sequence.i_height = (p_vpar->sequence.i_mb_height * 16);
 408     p_vpar->sequence.i_size = p_vpar->sequence.i_width
 409                                         * p_vpar->sequence.i_height;
 410
 411     /* Update chromatic information. */
 412     switch( p_vpar->sequence.i_chroma_format )
 413     {
 414     case CHROMA_420:
 415         p_vpar->sequence.i_chroma_nb_blocks = 2;
 416         p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width >> 1;
 417         p_vpar->sequence.i_chroma_mb_width = 8;
 418         p_vpar->sequence.i_chroma_mb_height = 8;
 419         break;
 420
 421     case CHROMA_422:
 422         p_vpar->sequence.i_chroma_nb_blocks = 4;
 423         p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width >> 1;
 424         p_vpar->sequence.i_chroma_mb_width = 8;
 425         p_vpar->sequence.i_chroma_mb_height = 16;
 426         break;
 427
 428     case CHROMA_444:
 429         p_vpar->sequence.i_chroma_nb_blocks = 8;
 430         p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width;
 431         p_vpar->sequence.i_chroma_mb_width = 16;
 432         p_vpar->sequence.i_chroma_mb_height = 16;
 433     }
 434
 435     /* Reset scalable_mode. */
 436     p_vpar->sequence.i_scalable_mode = SC_NONE;
 437
 438 #if 0
 439     if(    p_vpar->sequence.i_width != i_width_save
 440         || p_vpar->sequence.i_height != i_height_save )
 441     {
 442          /* FIXME: What do we do in case of a size change ?? */
 443     }
 444 #endif
 445
 446     /* Extension and User data */
 447     ExtensionAndUserData( p_vpar );
 448 }
 449
 450 /*****************************************************************************
 451  * GroupHeader : Parse the next group of pictures header
 452  *****************************************************************************/
 453 static void GroupHeader( vpar_thread_t * p_vpar )
 454 {
 455     /* Nothing to do, we don't care. */
 456     RemoveBits( &p_vpar->bit_stream, 27 );
 457     ExtensionAndUserData( p_vpar );
 458 }
 459
 460 /*****************************************************************************
 461  * PictureHeader : Parse the next picture header
 462  *****************************************************************************/
 463 static void PictureHeader( vpar_thread_t * p_vpar )
 464 {
 465     int                 i_structure;
 466     int                 i_mb_base;
 467     boolean_t           b_parsable;
 468 #ifdef VDEC_SMP
 469     int                 i_mb;
 470 #endif
 471
 472     /* Recover in case of stream discontinuity. */
 473     if( p_vpar->sequence.b_expect_discontinuity )
 474     {
 475         ReferenceUpdate( p_vpar, I_CODING_TYPE, NULL );
 476         ReferenceUpdate( p_vpar, I_CODING_TYPE, NULL );
 477         if( p_vpar->picture.p_picture != NULL )
 478         {
 479 #ifdef VDEC_SMP
 480             int     i_mb;
 481
 482             for( i_mb = 0; p_vpar->picture.pp_mb[i_mb] != NULL; i_mb++ )
 483             {
 484                 vpar_DestroyMacroblock( &p_vpar->vfifo,
 485                                         p_vpar->picture.pp_mb[i_mb] );
 486             }
 487 #endif
 488             vout_DestroyPicture( p_vpar->p_vout, p_vpar->picture.p_picture );
 489         }
 490         p_vpar->sequence.b_expect_discontinuity = 0;
 491     }
 492
 493     /* Parse the picture header. */
 494     RemoveBits( &p_vpar->bit_stream, 10 ); /* temporal_reference */
 495     p_vpar->picture.i_coding_type = GetBits( &p_vpar->bit_stream, 3 );
 496     RemoveBits( &p_vpar->bit_stream, 16 ); /* vbv_delay */
 497
 498     if( p_vpar->picture.i_coding_type == P_CODING_TYPE
 499         || p_vpar->picture.i_coding_type == B_CODING_TYPE )
 500     {
 501         p_vpar->picture.pb_full_pel_vector[0] = GetBits( &p_vpar->bit_stream, 1 );
 502         p_vpar->picture.i_forward_f_code = GetBits( &p_vpar->bit_stream, 3 );
 503     }
 504     if( p_vpar->picture.i_coding_type == B_CODING_TYPE )
 505     {
 506         p_vpar->picture.pb_full_pel_vector[1] = GetBits( &p_vpar->bit_stream, 1 );
 507         p_vpar->picture.i_backward_f_code = GetBits( &p_vpar->bit_stream, 3 );
 508     }
 509
 510     /* extra_information_picture */
 511     while( GetBits( &p_vpar->bit_stream, 1 ) )
 512     {
 513         RemoveBits( &p_vpar->bit_stream, 8 );
 514     }
 515
 516     /*
 517      * Picture Coding Extension
 518      */
 519     NextStartCode( &p_vpar->bit_stream );
 520     if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
 521     {
 522         /* Parse picture_coding_extension */
 523         RemoveBits32( &p_vpar->bit_stream );
 524         /* extension_start_code_identifier */
 525         RemoveBits( &p_vpar->bit_stream, 4 );
 526
 527         p_vpar->picture.ppi_f_code[0][0] = GetBits( &p_vpar->bit_stream, 4 );
 528         p_vpar->picture.ppi_f_code[0][1] = GetBits( &p_vpar->bit_stream, 4 );
 529         p_vpar->picture.ppi_f_code[1][0] = GetBits( &p_vpar->bit_stream, 4 );
 530         p_vpar->picture.ppi_f_code[1][1] = GetBits( &p_vpar->bit_stream, 4 );
 531         p_vpar->picture.i_intra_dc_precision = GetBits( &p_vpar->bit_stream, 2 );
 532         i_structure = GetBits( &p_vpar->bit_stream, 2 );
 533         p_vpar->picture.b_top_field_first = GetBits( &p_vpar->bit_stream, 1 );
 534         p_vpar->picture.b_frame_pred_frame_dct
 535              = GetBits( &p_vpar->bit_stream, 1 );
 536         p_vpar->picture.b_concealment_mv = GetBits( &p_vpar->bit_stream, 1 );
 537         p_vpar->picture.b_q_scale_type = GetBits( &p_vpar->bit_stream, 1 );
 538         p_vpar->picture.b_intra_vlc_format = GetBits( &p_vpar->bit_stream, 1 );
 539         p_vpar->picture.b_alternate_scan = GetBits( &p_vpar->bit_stream, 1 );
 540         p_vpar->picture.b_repeat_first_field = GetBits( &p_vpar->bit_stream, 1 );
 541         /* chroma_420_type (obsolete) */
 542         RemoveBits( &p_vpar->bit_stream, 1 );
 543         p_vpar->picture.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
 544
 545         /* composite_display_flag */
 546         if( GetBits( &p_vpar->bit_stream, 1 ) )
 547         {
 548             /* v_axis, field_sequence, sub_carrier, burst_amplitude,
 549              * sub_carrier_phase */
 550             RemoveBits( &p_vpar->bit_stream, 20 );
 551         }
 552     }
 553     else
 554     {
 555         /* MPEG-1 compatibility flags */
 556         p_vpar->picture.i_intra_dc_precision = 0; /* 8 bits */
 557         i_structure = FRAME_STRUCTURE;
 558         p_vpar->picture.b_top_field_first = 0;
 559         p_vpar->picture.b_frame_pred_frame_dct = 1;
 560         p_vpar->picture.b_concealment_mv = 0;
 561         p_vpar->picture.b_q_scale_type = 0;
 562         p_vpar->picture.b_intra_vlc_format = 0;
 563         p_vpar->picture.b_alternate_scan = 0; /* zigzag */
 564         p_vpar->picture.b_repeat_first_field = 0;
 565         p_vpar->picture.b_progressive = 1;
 566     }
 567
 568 #ifdef STATS
 569     p_vpar->pc_pictures[p_vpar->picture.i_coding_type]++;
 570 #endif
 571
 572     if( p_vpar->picture.i_current_structure &&
 573         (i_structure == FRAME_STRUCTURE ||
 574          i_structure == p_vpar->picture.i_current_structure) )
 575     {
 576         /* We don't have the second field of the buffered frame. */
 577         if( p_vpar->picture.p_picture != NULL )
 578         {
 579             ReferenceReplace( p_vpar,
 580                       p_vpar->picture.i_coding_type,
 581                       NULL );
 582
 583 #ifdef VDEC_SMP
 584             for( i_mb = 0; p_vpar->picture.pp_mb[i_mb] != NULL; i_mb++ )
 585             {
 586                 vpar_DestroyMacroblock( &p_vpar->vfifo,
 587                                         p_vpar->picture.pp_mb[i_mb] );
 588             }
 589 #endif
 590             vout_DestroyPicture( p_vpar->p_vout, p_vpar->picture.p_picture );
 591         }
 592
 593         p_vpar->picture.i_current_structure = 0;
 594
 595         intf_WarnMsg( 2, "Odd number of field pictures." );
 596     }
 597
 598     /* Do we have the reference pictures ? */
 599     b_parsable = !(((p_vpar->picture.i_coding_type == P_CODING_TYPE) &&
 600                     (p_vpar->sequence.p_backward == NULL)) ||
 601                      /* p_backward will become p_forward later */
 602                    ((p_vpar->picture.i_coding_type == B_CODING_TYPE) &&
 603                     (p_vpar->sequence.p_forward == NULL ||
 604                      p_vpar->sequence.p_backward == NULL)));
 605
 606     if( p_vpar->picture.i_current_structure )
 607     {
 608         /* Second field of a frame. We will decode it if, and only if we
 609          * have decoded the first field. */
 610         if( b_parsable )
 611         {
 612             b_parsable = (p_vpar->picture.p_picture != NULL);
 613         }
 614     }
 615     else
 616     {
 617         int     i_repeat_field;
 618
 619         /* Compute the number of times the frame will be emitted by the
 620          * decoder (number of half-periods). */
 621         if( p_vpar->sequence.b_progressive )
 622         {
 623             i_repeat_field = (1 + p_vpar->picture.b_repeat_first_field
 624                                 + p_vpar->picture.b_top_field_first) * 2;
 625         }
 626         else
 627         {
 628             if( p_vpar->picture.b_progressive )
 629             {
 630                 i_repeat_field = 2 + p_vpar->picture.b_repeat_first_field;
 631             }
 632             else
 633             {
 634                 i_repeat_field = 2;
 635             }
 636         }
 637
 638         /* Warn synchro we have a new picture (updates pictures index). */
 639         vpar_SynchroNewPicture( p_vpar, p_vpar->picture.i_coding_type,
 640                                 i_repeat_field );
 641
 642         if( b_parsable )
 643         {
 644             /* Does synchro say we have enough time to decode it ? */
 645             b_parsable = vpar_SynchroChoose( p_vpar,
 646                                p_vpar->picture.i_coding_type, i_structure );
 647         }
 648     }
 649
 650     if( !b_parsable )
 651     {
 652         /* Update the reference pointers. */
 653         ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, NULL );
 654
 655         /* Update context. */
 656         if( i_structure != FRAME_STRUCTURE )
 657         {
 658             if( (p_vpar->picture.i_current_structure | i_structure)
 659                     == FRAME_STRUCTURE )
 660             {
 661                 p_vpar->picture.i_current_structure = 0;
 662             }
 663             else
 664             {
 665                 /* The frame is complete. */
 666                 p_vpar->picture.i_current_structure = i_structure;
 667
 668                 vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
 669             }
 670         }
 671         else
 672         {
 673             /* Warn Synchro we have trashed a picture. */
 674             vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
 675         }
 676         p_vpar->picture.p_picture = NULL;
 677
 678         return;
 679     }
 680
 681     /* OK, now we are sure we will decode the picture. */
 682 #ifdef STATS
 683     p_vpar->pc_decoded_pictures[p_vpar->picture.i_coding_type]++;
 684 #endif
 685
 686 #define P_picture p_vpar->picture.p_picture
 687     p_vpar->picture.b_error = 0;
 688     p_vpar->picture.b_frame_structure = (i_structure == FRAME_STRUCTURE);
 689
 690     if( !p_vpar->picture.i_current_structure )
 691     {
 692         /* This is a new frame. Get a structure from the video_output. */
 693         while( ( P_picture = vout_CreatePicture( p_vpar->p_vout,
 694                                         99+p_vpar->sequence.i_chroma_format, /*XXX??*/
 695                                         p_vpar->sequence.i_width,
 696                                         p_vpar->sequence.i_height ) )
 697              == NULL )
 698         {
 699             intf_DbgMsg("vpar debug: allocation error in vout_CreatePicture, delaying");
 700             if( p_vpar->p_fifo->b_die || p_vpar->p_fifo->b_error )
 701             {
 702                 return;
 703             }
 704             msleep( VPAR_OUTMEM_SLEEP );
 705         }
 706
 707         /* Initialize values. */
 708         vpar_SynchroDecode( p_vpar, p_vpar->picture.i_coding_type, i_structure );
 709         P_picture->i_aspect_ratio = p_vpar->sequence.i_aspect_ratio;
 710         P_picture->i_matrix_coefficients = p_vpar->sequence.i_matrix_coefficients;
 711         p_vpar->picture.i_l_stride = ( p_vpar->sequence.i_width
 712                     << ( 1 - p_vpar->picture.b_frame_structure ) );
 713         p_vpar->picture.i_c_stride = ( p_vpar->sequence.i_chroma_width
 714                     << ( 1 - p_vpar->picture.b_frame_structure ));
 715
 716         P_picture->i_deccount = p_vpar->sequence.i_mb_size;
 717 #ifdef VDEC_SMP
 718         memset( p_vpar->picture.pp_mb, 0, MAX_MB*sizeof(macroblock_t *) );
 719 #endif
 720 /* FIXME ! remove asap ?? */
 721 //memset( P_picture->p_data, 0, (p_vpar->sequence.i_mb_size*384));
 722
 723         /* Update the reference pointers. */
 724         ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, P_picture );
 725
 726 #ifdef VDEC_SMP
 727         /* Link referenced pictures for the decoder
 728          * They are unlinked in vpar_ReleaseMacroblock() & vpar_DestroyMacroblock() */
 729         if( p_vpar->picture.i_coding_type == P_CODING_TYPE ||
 730             p_vpar->picture.i_coding_type == B_CODING_TYPE )
 731         {
 732             vout_LinkPicture( p_vpar->p_vout, p_vpar->sequence.p_forward );
 733         }
 734         if( p_vpar->picture.i_coding_type == B_CODING_TYPE )
 735         {
 736             vout_LinkPicture( p_vpar->p_vout, p_vpar->sequence.p_backward );
 737         }
 738 #endif
 739     }
 740     p_vpar->picture.i_current_structure |= i_structure;
 741     p_vpar->picture.i_structure = i_structure;
 742
 743     /* Initialize picture data for decoding. */
 744     if( i_structure == BOTTOM_FIELD )
 745     {
 746         i_mb_base = p_vpar->sequence.i_mb_size >> 1;
 747         p_vpar->mb.i_l_y = 1;
 748         p_vpar->mb.i_c_y = 1;
 749     }
 750     else
 751     {
 752         i_mb_base = 0;
 753         p_vpar->mb.i_l_y = p_vpar->mb.i_c_y = 0;
 754     }
 755     p_vpar->mb.i_l_x = p_vpar->mb.i_c_x = 0;
 756
 757     /* Extension and User data. */
 758     ExtensionAndUserData( p_vpar );
 759
 760     /* This is an MP@ML decoder, please note that neither of the following
 761      * assertions can be true :
 762      *   p_vpar->sequence.i_chroma_format != CHROMA_420
 763      *   p_vpar->sequence.i_height > 2800
 764      *   p_vpar->sequence.i_scalable_mode == SC_DP
 765      * Be cautious if you try to use the decoder for other profiles and
 766      * levels.
 767      */
 768     if( p_vpar->sequence.b_mpeg2 )
 769     {
 770         static f_picture_data_t ppf_picture_data[4][4] =
 771         {
 772             {
 773                 NULL, NULL, NULL, NULL
 774             },
 775             {
 776                 /* TOP_FIELD */
 777 #if (VPAR_OPTIM_LEVEL > 1)
 778                 NULL, vpar_PictureData2IT, vpar_PictureData2PT,
 779                 vpar_PictureData2BT
 780 #else
 781                 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
 782                 vpar_PictureDataGENERIC
 783 #endif
 784             },
 785             {
 786                 /* BOTTOM_FIELD */
 787 #if (VPAR_OPTIM_LEVEL > 1)
 788                 NULL, vpar_PictureData2IB, vpar_PictureData2PB,
 789                 vpar_PictureData2BB
 790 #else
 791                 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
 792                 vpar_PictureDataGENERIC
 793 #endif
 794             },
 795             {
 796                 /* FRAME_PICTURE */
 797 #if (VPAR_OPTIM_LEVEL > 0)
 798                 NULL, vpar_PictureData2IF, vpar_PictureData2PF,
 799                 vpar_PictureData2BF
 800 #else
 801                 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
 802                 vpar_PictureDataGENERIC
 803 #endif
 804             }
 805         };
 806
 807         ppf_picture_data[p_vpar->picture.i_structure]
 808                         [p_vpar->picture.i_coding_type]( p_vpar, i_mb_base );
 809     }
 810     else
 811     {
 812 #if (VPAR_OPTIM_LEVEL > 0)
 813         static f_picture_data_t pf_picture_data[5] =
 814         { NULL, vpar_PictureData1I, vpar_PictureData1P, vpar_PictureData1B,
 815           vpar_PictureData1D };
 816
 817         pf_picture_data[p_vpar->picture.i_coding_type]( p_vpar, i_mb_base );
 818 #else
 819         vpar_PictureDataGENERIC( p_vpar, i_mb_base );
 820 #endif
 821     }
 822
 823     if( p_vpar->p_fifo->b_die || p_vpar->p_fifo->b_error )
 824     {
 825         return;
 826     }
 827
 828     if( p_vpar->picture.b_error )
 829     {
 830         /* Trash picture. */
 831 #ifdef VDEC_SMP
 832         for( i_mb = 1; p_vpar->picture.pp_mb[i_mb] != NULL; i_mb++ )
 833         {
 834             vpar_DestroyMacroblock( &p_vpar->vfifo, p_vpar->picture.pp_mb[i_mb] );
 835         }
 836 #endif
 837
 838 #ifdef STATS
 839         p_vpar->pc_malformed_pictures[p_vpar->picture.i_coding_type]++;
 840 #endif
 841
 842         if( P_picture->i_deccount != 1 )
 843         {
 844             vpar_SynchroEnd( p_vpar, 1 );
 845             vout_DestroyPicture( p_vpar->p_vout, P_picture );
 846         }
 847
 848         ReferenceReplace( p_vpar, p_vpar->picture.i_coding_type, NULL );
 849
 850         /* Prepare context for the next picture. */
 851         P_picture = NULL;
 852         if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
 853             p_vpar->picture.i_current_structure = 0;
 854     }
 855     else if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
 856     {
 857         /* Frame completely parsed. */
 858 #ifdef VDEC_SMP
 859         for( i_mb = 1; p_vpar->picture.pp_mb[i_mb] != NULL; i_mb++ )
 860         {
 861             vpar_DecodeMacroblock( &p_vpar->vfifo, p_vpar->picture.pp_mb[i_mb] );
 862         }
 863
 864         /* Send signal to the video_decoder. */
 865         vlc_mutex_lock( &p_vpar->vfifo.lock );
 866         vlc_cond_signal( &p_vpar->vfifo.wait );
 867         vlc_mutex_unlock( &p_vpar->vfifo.lock );
 868 #endif
 869
 870         /* Prepare context for the next picture. */
 871         P_picture = NULL;
 872         p_vpar->picture.i_current_structure = 0;
 873     }
 874 #undef P_picture
 875 }
 876
 877 /*****************************************************************************
 878  * ExtensionAndUserData : Parse the extension_and_user_data structure
 879  *****************************************************************************/
 880 static void ExtensionAndUserData( vpar_thread_t * p_vpar )
 881 {
 882     while( !p_vpar->p_fifo->b_die )
 883     {
 884         NextStartCode( &p_vpar->bit_stream );
 885         switch( ShowBits( &p_vpar->bit_stream, 32 ) )
 886         {
 887         case EXTENSION_START_CODE:
 888             RemoveBits32( &p_vpar->bit_stream );
 889             switch( GetBits( &p_vpar->bit_stream, 4 ) )
 890             {
 891             case SEQUENCE_DISPLAY_EXTENSION_ID:
 892                 SequenceDisplayExtension( p_vpar );
 893                 break;
 894             case QUANT_MATRIX_EXTENSION_ID:
 895                 QuantMatrixExtension( p_vpar );
 896                 break;
 897             case SEQUENCE_SCALABLE_EXTENSION_ID:
 898                 SequenceScalableExtension( p_vpar );
 899                 break;
 900             case PICTURE_DISPLAY_EXTENSION_ID:
 901                 PictureDisplayExtension( p_vpar );
 902                 break;
 903             case PICTURE_SPATIAL_SCALABLE_EXTENSION_ID:
 904                 PictureSpatialScalableExtension( p_vpar );
 905                 break;
 906             case PICTURE_TEMPORAL_SCALABLE_EXTENSION_ID:
 907                 PictureTemporalScalableExtension( p_vpar );
 908                 break;
 909             case COPYRIGHT_EXTENSION_ID:
 910                 CopyrightExtension( p_vpar );
 911                 break;
 912             default:
 913             }
 914             break;
 915
 916         case USER_DATA_START_CODE:
 917             RemoveBits32( &p_vpar->bit_stream );
 918             /* Wait for the next start code */
 919             break;
 920
 921         default:
 922             return;
 923         }
 924     }
 925 }
 926
 927
 928 /*****************************************************************************
 929  * SequenceDisplayExtension : Parse the sequence_display_extension structure *
 930  *****************************************************************************/
 931
 932 static void SequenceDisplayExtension( vpar_thread_t * p_vpar )
 933 {
 934     /* We don't care sequence_display_extension. */
 935     /* video_format */
 936     RemoveBits( &p_vpar->bit_stream, 3 );
 937     if( GetBits( &p_vpar->bit_stream, 1 ) )
 938     {
 939         /* Two bytes for color_desciption */
 940         RemoveBits( &p_vpar->bit_stream, 16 );
 941         p_vpar->sequence.i_matrix_coefficients = GetBits( &p_vpar->bit_stream, 8 );
 942     }
 943     /* display_horizontal and vertical_size and a marker_bit */
 944     RemoveBits( &p_vpar->bit_stream, 29 );
 945 }
 946
 947
 948 /*****************************************************************************
 949  * QuantMatrixExtension : Load quantization matrices for luminance           *
 950  *                        and chrominance                                    *
 951  *****************************************************************************/
 952
 953 static void QuantMatrixExtension( vpar_thread_t * p_vpar )
 954 {
 955     if( GetBits( &p_vpar->bit_stream, 1 ) )
 956     {
 957         /* Load intra_quantiser_matrix for luminance. */
 958         LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
 959     }
 960     else
 961     {
 962         /* Use the default matrix. */
 963         LinkMatrix( &p_vpar->sequence.intra_quant,
 964                     p_vpar->pi_default_intra_quant );
 965     }
 966     if( GetBits( &p_vpar->bit_stream, 1 ) )
 967     {
 968         /* Load non_intra_quantiser_matrix for luminance. */
 969         LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
 970     }
 971     else
 972     {
 973         /* Use the default matrix. */
 974         LinkMatrix( &p_vpar->sequence.nonintra_quant,
 975                     p_vpar->pi_default_nonintra_quant );
 976     }
 977     if( GetBits( &p_vpar->bit_stream, 1 ) )
 978     {
 979         /* Load intra_quantiser_matrix for chrominance. */
 980         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_intra_quant );
 981     }
 982     else
 983     {
 984         /* Link the chrominance intra matrix to the luminance one. */
 985         LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 986                     p_vpar->sequence.intra_quant.pi_matrix );
 987     }
 988     if( GetBits( &p_vpar->bit_stream, 1 ) )
 989     {
 990         /* Load non_intra_quantiser_matrix for chrominance. */
 991         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
 992     }
 993     else
 994     {
 995         /* Link the chrominance intra matrix to the luminance one. */
 996         LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 997                     p_vpar->sequence.intra_quant.pi_matrix );
 998     }
 999     if( GetBits( &p_vpar->bit_stream, 1 ) )
1000     {
1001         /* Load non_intra_quantiser_matrix for chrominance. */
1002         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
1003     }
1004     else
1005     {
1006         /* Link the chrominance nonintra matrix to the luminance one. */
1007         LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
1008                     p_vpar->sequence.nonintra_quant.pi_matrix );
1009     }
1010 }
1011
1012
1013 /*****************************************************************************
1014  * SequenceScalableExtension : Parse the sequence_scalable_extension         *
1015  *                             structure to handle scalable coding           *
1016  *****************************************************************************/
1017
1018 static void SequenceScalableExtension( vpar_thread_t * p_vpar )
1019 {
1020     /* We don't care about anything scalable except the scalable mode. */
1021     switch( p_vpar->sequence.i_scalable_mode = GetBits( &p_vpar->bit_stream, 2 ) )
1022     /* The length of the structure depends on the value of the scalable_mode */
1023     {
1024         case 1:
1025             RemoveBits32( &p_vpar->bit_stream );
1026             RemoveBits( &p_vpar->bit_stream, 21 );
1027             break;
1028         case 2:
1029             RemoveBits( &p_vpar->bit_stream, 12 );
1030             break;
1031         default:
1032             RemoveBits( &p_vpar->bit_stream, 4 );
1033     }
1034
1035 }
1036 /*****************************************************************************
1037  * PictureDisplayExtension : Parse the picture_display_extension structure   *
1038  *****************************************************************************/
1039
1040 static void PictureDisplayExtension( vpar_thread_t * p_vpar )
1041 {
1042     /* Number of frame center offset */
1043     int i_nb, i_dummy;
1044     /* I am not sure it works but it should
1045         (fewer tests than shown in §6.3.12) */
1046     i_nb = p_vpar->sequence.b_progressive ? p_vpar->sequence.b_progressive +
1047                                             p_vpar->picture.b_repeat_first_field +
1048                                             p_vpar->picture.b_top_field_first
1049                            : ( p_vpar->picture.b_frame_structure + 1 ) +
1050                              p_vpar->picture.b_repeat_first_field;
1051     for( i_dummy = 0; i_dummy < i_nb; i_dummy++ )
1052     {
1053         RemoveBits( &p_vpar->bit_stream, 17 );
1054         RemoveBits( &p_vpar->bit_stream, 17 );
1055     }
1056 }
1057
1058
1059 /*****************************************************************************
1060  * PictureSpatialScalableExtension                                           *
1061  *****************************************************************************/
1062
1063 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar )
1064 {
1065     /* That's scalable, so we trash it */
1066     RemoveBits32( &p_vpar->bit_stream );
1067     RemoveBits( &p_vpar->bit_stream, 16 );
1068 }
1069
1070
1071 /*****************************************************************************
1072  * PictureTemporalScalableExtension                                          *
1073  *****************************************************************************/
1074
1075 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar )
1076 {
1077     /* Scalable again, trashed again */
1078     RemoveBits( &p_vpar->bit_stream, 23 );
1079 }
1080
1081
1082 /*****************************************************************************
1083  * CopyrightExtension : Keeps some legal informations                        *
1084  *****************************************************************************/
1085
1086 static void CopyrightExtension( vpar_thread_t * p_vpar )
1087 {
1088     u32     i_copyright_nb_1, i_copyright_nb_2; /* local integers */
1089     p_vpar->sequence.b_copyright_flag = GetBits( &p_vpar->bit_stream, 1 );
1090         /* A flag that says whether the copyright information is significant */
1091     p_vpar->sequence.i_copyright_id = GetBits( &p_vpar->bit_stream, 8 );
1092         /* An identifier compliant with ISO/CEI JTC 1/SC 29 */
1093     p_vpar->sequence.b_original = GetBits( &p_vpar->bit_stream, 1 );
1094         /* Reserved bits */
1095     RemoveBits( &p_vpar->bit_stream, 8 );
1096         /* The copyright_number is split in three parts */
1097         /* first part */
1098     i_copyright_nb_1 = GetBits( &p_vpar->bit_stream, 20 );
1099     RemoveBits( &p_vpar->bit_stream, 1 );
1100         /* second part */
1101     i_copyright_nb_2 = GetBits( &p_vpar->bit_stream, 22 );
1102     RemoveBits( &p_vpar->bit_stream, 1 );
1103         /* third part and sum */
1104     p_vpar->sequence.i_copyright_nb = ( (u64)i_copyright_nb_1 << 44 ) |
1105                                       ( (u64)i_copyright_nb_2 << 22 ) |
1106                                       ( (u64)GetBits( &p_vpar->bit_stream, 22 ) );
1107 }