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

   1 /*****************************************************************************
   2  * vpar_headers.c : headers parsing
   3  *****************************************************************************
   4  * Copyright (C) 1999, 2000 VideoLAN
   5  * $Id: vpar_headers.c,v 1.11 2001/10/01 16:44:07 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 #include <string.h>                                    /* memcpy(), memset() */
  32
  33 #include "config.h"
  34 #include "common.h"
  35 #include "threads.h"
  36 #include "mtime.h"
  37
  38 #include "intf_msg.h"
  39
  40 #include "stream_control.h"
  41 #include "input_ext-dec.h"
  42
  43 #include "video.h"
  44 #include "video_output.h"
  45
  46 #include "vdec_ext-plugins.h"
  47 #include "vpar_pool.h"
  48 #include "video_parser.h"
  49
  50 /*
  51  * Local prototypes
  52  */
  53 static __inline__ void NextStartCode( bit_stream_t * );
  54 static void SequenceHeader( vpar_thread_t * p_vpar );
  55 static void GroupHeader( vpar_thread_t * p_vpar );
  56 static void PictureHeader( vpar_thread_t * p_vpar );
  57 static void ExtensionAndUserData( vpar_thread_t * p_vpar );
  58 static void QuantMatrixExtension( vpar_thread_t * p_vpar );
  59 static void SequenceScalableExtension( vpar_thread_t * p_vpar );
  60 static void SequenceDisplayExtension( vpar_thread_t * p_vpar );
  61 static void PictureDisplayExtension( vpar_thread_t * p_vpar );
  62 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar );
  63 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar );
  64 static void CopyrightExtension( vpar_thread_t * p_vpar );
  65
  66 /*
  67  * Standard variables
  68  */
  69
  70 /*****************************************************************************
  71  * pi_default_intra_quant : default quantization matrix
  72  *****************************************************************************/
  73 u8 pi_default_intra_quant[] ATTR_ALIGN(16) =
  74 {
  75     8,  16, 19, 22, 26, 27, 29, 34,
  76     16, 16, 22, 24, 27, 29, 34, 37,
  77     19, 22, 26, 27, 29, 34, 34, 38,
  78     22, 22, 26, 27, 29, 34, 37, 40,
  79     22, 26, 27, 29, 32, 35, 40, 48,
  80     26, 27, 29, 32, 35, 40, 48, 58,
  81     26, 27, 29, 34, 38, 46, 56, 69,
  82     27, 29, 35, 38, 46, 56, 69, 83
  83 };
  84
  85 /*****************************************************************************
  86  * pi_default_nonintra_quant : default quantization matrix
  87  *****************************************************************************/
  88 u8 pi_default_nonintra_quant[] ATTR_ALIGN(16) =
  89 {
  90     16, 16, 16, 16, 16, 16, 16, 16,
  91     16, 16, 16, 16, 16, 16, 16, 16,
  92     16, 16, 16, 16, 16, 16, 16, 16,
  93     16, 16, 16, 16, 16, 16, 16, 16,
  94     16, 16, 16, 16, 16, 16, 16, 16,
  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 };
  99
 100 /*****************************************************************************
 101  * pi_scan : zig-zag and alternate scan patterns
 102  *****************************************************************************/
 103 u8 pi_scan[2][64] ATTR_ALIGN(16) =
 104 {
 105     { /* Zig-Zag pattern */
 106         0,1,8,16,9,2,3,10,17,24,32,25,18,11,4,5,
 107         12,19,26,33,40,48,41,34,27,20,13,6,7,14,21,28,
 108         35,42,49,56,57,50,43,36,29,22,15,23,30,37,44,51,
 109         58,59,52,45,38,31,39,46,53,60,61,54,47,55,62,63
 110     },
 111     { /* Alternate scan pattern */
 112         0,8,16,24,1,9,2,10,17,25,32,40,48,56,57,49,
 113         41,33,26,18,3,11,4,12,19,27,34,42,50,58,35,43,
 114         51,59,20,28,5,13,6,14,21,29,36,44,52,60,37,45,
 115         53,61,22,30,7,15,23,31,38,46,54,62,39,47,55,63
 116     }
 117 };
 118
 119 /*
 120  * Local inline functions.
 121  */
 122
 123 /*****************************************************************************
 124  * ReferenceUpdate : Update the reference pointers when we have a new picture
 125  *****************************************************************************/
 126 static void __inline__ ReferenceUpdate( vpar_thread_t * p_vpar,
 127                                         int i_coding_type,
 128                                         picture_t * p_newref )
 129 {
 130     if( i_coding_type != B_CODING_TYPE )
 131     {
 132         if( p_vpar->sequence.p_forward != NULL )
 133         {
 134             vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_forward );
 135         }
 136         if( p_vpar->sequence.p_backward != NULL )
 137         {
 138             vout_DatePicture( p_vpar->p_vout, p_vpar->sequence.p_backward,
 139                               vpar_SynchroDate( p_vpar ) );
 140         }
 141         p_vpar->sequence.p_forward = p_vpar->sequence.p_backward;
 142         p_vpar->sequence.p_backward = p_newref;
 143         if( p_newref != NULL )
 144         {
 145             vout_LinkPicture( p_vpar->p_vout, p_newref );
 146         }
 147     }
 148     else if( p_newref != NULL )
 149     {
 150         /* Put date immediately. */
 151         vout_DatePicture( p_vpar->p_vout, p_newref, vpar_SynchroDate(p_vpar) );
 152     }
 153 }
 154
 155 /*****************************************************************************
 156  * ReferenceReplace : Replace the last reference pointer when we destroy
 157  *                    a picture
 158  *****************************************************************************/
 159 static void __inline__ ReferenceReplace( vpar_thread_t * p_vpar,
 160                                          int i_coding_type,
 161                                          picture_t * p_newref )
 162 {
 163     if( i_coding_type != B_CODING_TYPE )
 164     {
 165         if( p_vpar->sequence.p_backward != NULL )
 166         {
 167             vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_backward );
 168         }
 169         p_vpar->sequence.p_backward = p_newref;
 170         if( p_newref != NULL )
 171         {
 172             vout_LinkPicture( p_vpar->p_vout, p_newref );
 173         }
 174     }
 175 }
 176
 177 /*****************************************************************************
 178  * LoadMatrix : Load a quantization matrix
 179  *****************************************************************************/
 180 static __inline__ void LoadMatrix( vpar_thread_t * p_vpar,
 181                                    quant_matrix_t * p_matrix )
 182 {
 183     int i_dummy;
 184
 185     if( !p_matrix->b_allocated )
 186     {
 187         /* Allocate a piece of memory to load the matrix. */
 188         if( (p_matrix->pi_matrix = (u8 *)malloc( 64*sizeof(u8) )) == NULL )
 189         {
 190             intf_ErrMsg( "vpar error: allocation error in LoadMatrix()" );
 191             p_vpar->p_fifo->b_error = 1;
 192             return;
 193         }
 194         p_matrix->b_allocated = 1;
 195     }
 196
 197     for( i_dummy = 0; i_dummy < 64; i_dummy++ )
 198     {
 199         p_matrix->pi_matrix[p_vpar->ppi_scan[0][i_dummy]]
 200              = GetBits( &p_vpar->bit_stream, 8 );
 201     }
 202 }
 203
 204 /*****************************************************************************
 205  * LinkMatrix : Link a quantization matrix to another
 206  *****************************************************************************/
 207 static __inline__ void LinkMatrix( quant_matrix_t * p_matrix, u8 * pi_array )
 208 {
 209     if( p_matrix->b_allocated )
 210     {
 211         /* Deallocate the piece of memory. */
 212         free( p_matrix->pi_matrix );
 213         p_matrix->b_allocated = 0;
 214     }
 215
 216     p_matrix->pi_matrix = pi_array;
 217 }
 218
 219 /*
 220  * Exported functions.
 221  */
 222
 223 /*****************************************************************************
 224  * vpar_NextSequenceHeader : Find the next sequence header
 225  *****************************************************************************/
 226 int vpar_NextSequenceHeader( vpar_thread_t * p_vpar )
 227 {
 228     while( !p_vpar->p_fifo->b_die )
 229     {
 230         NextStartCode( &p_vpar->bit_stream );
 231         if( ShowBits( &p_vpar->bit_stream, 32 ) == SEQUENCE_HEADER_CODE )
 232         {
 233             return 0;
 234         }
 235         RemoveBits( &p_vpar->bit_stream, 8 );
 236     }
 237     return 1;
 238 }
 239
 240 /*****************************************************************************
 241  * vpar_ParseHeader : Parse the next header
 242  *****************************************************************************/
 243 int vpar_ParseHeader( vpar_thread_t * p_vpar )
 244 {
 245     while( !p_vpar->p_fifo->b_die )
 246     {
 247         NextStartCode( &p_vpar->bit_stream );
 248         switch( GetBits32( &p_vpar->bit_stream ) )
 249         {
 250         case SEQUENCE_HEADER_CODE:
 251             p_vpar->c_sequences++;
 252
 253             SequenceHeader( p_vpar );
 254             return 0;
 255             break;
 256
 257         case GROUP_START_CODE:
 258             GroupHeader( p_vpar );
 259             return 0;
 260             break;
 261
 262         case PICTURE_START_CODE:
 263             PictureHeader( p_vpar );
 264             return 0;
 265             break;
 266
 267         case SEQUENCE_END_CODE:
 268             intf_DbgMsg("vpar debug: sequence end code received");
 269             return 1;
 270             break;
 271
 272         default:
 273             break;
 274         }
 275     }
 276
 277     return 0;
 278 }
 279
 280 /*
 281  * Following functions are local
 282  */
 283
 284 /*****************************************************************************
 285  * SequenceHeader : Parse the next sequence header
 286  *****************************************************************************/
 287 static void SequenceHeader( vpar_thread_t * p_vpar )
 288 {
 289 #define RESERVED    -1
 290     static int i_frame_rate_table[16] =
 291     {
 292         0,
 293         23 * 1000,
 294         24 * 1001,
 295         25 * 1001,
 296         30 * 1000,
 297         30 * 1001,
 298         50 * 1001,
 299         60 * 1000,
 300         60 * 1001,
 301         RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED
 302     };
 303 #undef RESERVED
 304
 305     int i_height_save, i_width_save;
 306
 307     i_height_save = p_vpar->sequence.i_height;
 308     i_width_save = p_vpar->sequence.i_width;
 309
 310     p_vpar->sequence.i_width = GetBits( &p_vpar->bit_stream, 12 );
 311     p_vpar->sequence.i_height = GetBits( &p_vpar->bit_stream, 12 );
 312     p_vpar->sequence.i_aspect_ratio = GetBits( &p_vpar->bit_stream, 4 );
 313     p_vpar->sequence.i_frame_rate =
 314             i_frame_rate_table[ GetBits( &p_vpar->bit_stream, 4 ) ];
 315
 316     /* We don't need bit_rate_value, marker_bit, vbv_buffer_size,
 317      * constrained_parameters_flag */
 318     RemoveBits( &p_vpar->bit_stream, 30 );
 319
 320     /*
 321      * Quantization matrices
 322      */
 323     if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_intra_quantizer_matrix */
 324     {
 325         LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
 326     }
 327     else
 328     {
 329         /* Use default matrix. */
 330         LinkMatrix( &p_vpar->sequence.intra_quant,
 331                     p_vpar->pi_default_intra_quant );
 332     }
 333
 334     if( GetBits(&p_vpar->bit_stream, 1) ) /* load_non_intra_quantizer_matrix */
 335     {
 336         LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
 337     }
 338     else
 339     {
 340         /* Use default matrix. */
 341         LinkMatrix( &p_vpar->sequence.nonintra_quant,
 342                     p_vpar->pi_default_nonintra_quant );
 343     }
 344
 345     /* Unless later overwritten by a matrix extension, we have the same
 346      * matrices for luminance and chrominance. */
 347     LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 348                 p_vpar->sequence.intra_quant.pi_matrix );
 349     LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
 350                 p_vpar->sequence.nonintra_quant.pi_matrix );
 351
 352     /*
 353      * Sequence Extension
 354      */
 355     NextStartCode( &p_vpar->bit_stream );
 356     if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
 357     {
 358         int                         i_dummy;
 359
 360         /* Turn the MPEG2 flag on */
 361         p_vpar->sequence.b_mpeg2 = 1;
 362
 363         /* Parse sequence_extension */
 364         RemoveBits32( &p_vpar->bit_stream );
 365         /* extension_start_code_identifier, profile_and_level_indication */
 366         RemoveBits( &p_vpar->bit_stream, 12 );
 367         p_vpar->sequence.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
 368         p_vpar->sequence.i_chroma_format = GetBits( &p_vpar->bit_stream, 2 );
 369         p_vpar->sequence.i_width |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
 370         p_vpar->sequence.i_height |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
 371         /* bit_rate_extension, marker_bit, vbv_buffer_size_extension,
 372          * low_delay */
 373         RemoveBits( &p_vpar->bit_stream, 22 );
 374         /* frame_rate_extension_n */
 375         i_dummy = GetBits( &p_vpar->bit_stream, 2 );
 376         /* frame_rate_extension_d */
 377         p_vpar->sequence.i_frame_rate *= (i_dummy + 1)
 378                                   / (GetBits( &p_vpar->bit_stream, 5 ) + 1);
 379     }
 380     else
 381     {
 382         /* It's an MPEG-1 stream. Put adequate parameters. */
 383
 384         p_vpar->sequence.b_mpeg2 = 0;
 385         p_vpar->sequence.b_progressive = 1;
 386         p_vpar->sequence.i_chroma_format = CHROMA_420;
 387     }
 388
 389     /* Update sizes */
 390     p_vpar->sequence.i_mb_width = (p_vpar->sequence.i_width + 15) / 16;
 391     p_vpar->sequence.i_mb_height = (p_vpar->sequence.b_progressive) ?
 392                                    (p_vpar->sequence.i_height + 15) / 16 :
 393                                    2 * ((p_vpar->sequence.i_height + 31) / 32);
 394     p_vpar->sequence.i_mb_size = p_vpar->sequence.i_mb_width
 395                                         * p_vpar->sequence.i_mb_height;
 396     p_vpar->sequence.i_width = (p_vpar->sequence.i_mb_width * 16);
 397     p_vpar->sequence.i_height = (p_vpar->sequence.i_mb_height * 16);
 398     p_vpar->sequence.i_size = p_vpar->sequence.i_width
 399                                         * p_vpar->sequence.i_height;
 400
 401 #if 0
 402     if(    p_vpar->sequence.i_width != i_width_save
 403         || p_vpar->sequence.i_height != i_height_save )
 404     {
 405          /* FIXME: Warn the video output */
 406     }
 407 #endif
 408
 409     /* Extension and User data */
 410     ExtensionAndUserData( p_vpar );
 411
 412     /* XXX: The vout request and fifo opening will eventually be here */
 413
 414     /* Spawn a video output if there is none */
 415     vlc_mutex_lock( &p_vout_bank->lock );
 416
 417     if( p_vout_bank->i_count == 0 )
 418     {
 419         intf_WarnMsg( 1, "vpar: no vout present, spawning one" );
 420
 421         p_vpar->p_vout = vout_CreateThread( NULL, p_vpar->sequence.i_width,
 422                                             p_vpar->sequence.i_height );
 423
 424         /* Everything failed */
 425         if( p_vpar->p_vout == NULL )
 426         {
 427             intf_ErrMsg( "vpar error: can't open vout, aborting" );
 428             vlc_mutex_unlock( &p_vout_bank->lock );
 429
 430             /* XXX ! XXX ! XXX ! what to do here ? */
 431             return;
 432         }
 433
 434         p_vout_bank->pp_vout[ p_vout_bank->i_count ] = p_vpar->p_vout;
 435         p_vout_bank->i_count++;
 436     }
 437     else
 438     {
 439         /* Take the first video output FIXME: take the best one */
 440         p_vpar->p_vout = p_vout_bank->pp_vout[ 0 ];
 441     }
 442
 443     vlc_mutex_unlock( &p_vout_bank->lock );
 444 }
 445
 446 /*****************************************************************************
 447  * GroupHeader : Parse the next group of pictures header
 448  *****************************************************************************/
 449 static void GroupHeader( vpar_thread_t * p_vpar )
 450 {
 451     /* Nothing to do, we don't care. */
 452     RemoveBits( &p_vpar->bit_stream, 27 );
 453     ExtensionAndUserData( p_vpar );
 454 }
 455
 456 /*****************************************************************************
 457  * PictureHeader : Parse the next picture header
 458  *****************************************************************************/
 459 static void PictureHeader( vpar_thread_t * p_vpar )
 460 {
 461     int                 i_structure, i_previous_coding_type;
 462     boolean_t           b_parsable = 0;
 463
 464     /* Recover in case of stream discontinuity. */
 465     if( p_vpar->sequence.b_expect_discontinuity )
 466     {
 467         ReferenceUpdate( p_vpar, I_CODING_TYPE, NULL );
 468         ReferenceUpdate( p_vpar, I_CODING_TYPE, NULL );
 469         if( p_vpar->picture.p_picture != NULL )
 470         {
 471             vout_DestroyPicture( p_vpar->p_vout, p_vpar->picture.p_picture );
 472             p_vpar->picture.p_picture = NULL;
 473         }
 474         p_vpar->picture.i_current_structure = 0;
 475         p_vpar->sequence.b_expect_discontinuity = 0;
 476     }
 477
 478     /* Parse the picture header. */
 479     RemoveBits( &p_vpar->bit_stream, 10 ); /* temporal_reference */
 480     i_previous_coding_type = p_vpar->picture.i_coding_type;
 481     p_vpar->picture.i_coding_type = GetBits( &p_vpar->bit_stream, 3 );
 482     RemoveBits( &p_vpar->bit_stream, 16 ); /* vbv_delay */
 483
 484     if( p_vpar->picture.i_coding_type == P_CODING_TYPE
 485         || p_vpar->picture.i_coding_type == B_CODING_TYPE )
 486     {
 487         p_vpar->picture.ppi_f_code[0][1] = GetBits( &p_vpar->bit_stream, 1 );
 488         p_vpar->picture.ppi_f_code[0][0] = GetBits( &p_vpar->bit_stream, 3 )
 489                                             - 1;
 490     }
 491     if( p_vpar->picture.i_coding_type == B_CODING_TYPE )
 492     {
 493         p_vpar->picture.ppi_f_code[1][1] = GetBits( &p_vpar->bit_stream, 1 );
 494         p_vpar->picture.ppi_f_code[1][0] = GetBits( &p_vpar->bit_stream, 3 )
 495                                             - 1;
 496     }
 497
 498     /* extra_information_picture */
 499     while( GetBits( &p_vpar->bit_stream, 1 ) )
 500     {
 501         RemoveBits( &p_vpar->bit_stream, 8 );
 502     }
 503
 504     /*
 505      * Picture Coding Extension
 506      */
 507     NextStartCode( &p_vpar->bit_stream );
 508     if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
 509     {
 510         /* Parse picture_coding_extension */
 511         RemoveBits32( &p_vpar->bit_stream );
 512         /* extension_start_code_identifier */
 513         RemoveBits( &p_vpar->bit_stream, 4 );
 514
 515         /* Pre-substract 1 for later use in MotionDelta(). */
 516         p_vpar->picture.ppi_f_code[0][0] = GetBits( &p_vpar->bit_stream, 4 ) -1;
 517         p_vpar->picture.ppi_f_code[0][1] = GetBits( &p_vpar->bit_stream, 4 ) -1;
 518         p_vpar->picture.ppi_f_code[1][0] = GetBits( &p_vpar->bit_stream, 4 ) -1;
 519         p_vpar->picture.ppi_f_code[1][1] = GetBits( &p_vpar->bit_stream, 4 ) -1;
 520         p_vpar->picture.i_intra_dc_precision = GetBits( &p_vpar->bit_stream, 2 );
 521         i_structure = GetBits( &p_vpar->bit_stream, 2 );
 522         p_vpar->picture.b_top_field_first = GetBits( &p_vpar->bit_stream, 1 );
 523         p_vpar->picture.b_frame_pred_frame_dct
 524              = GetBits( &p_vpar->bit_stream, 1 );
 525         p_vpar->picture.b_concealment_mv = GetBits( &p_vpar->bit_stream, 1 );
 526         p_vpar->picture.b_q_scale_type = GetBits( &p_vpar->bit_stream, 1 );
 527         p_vpar->picture.b_intra_vlc_format = GetBits( &p_vpar->bit_stream, 1 );
 528         /* Alternate scan */
 529         p_vpar->picture.pi_scan =
 530             p_vpar->ppi_scan[ GetBits( &p_vpar->bit_stream, 1 ) ];
 531         p_vpar->picture.b_repeat_first_field = GetBits( &p_vpar->bit_stream, 1 );
 532         /* chroma_420_type (obsolete) */
 533         RemoveBits( &p_vpar->bit_stream, 1 );
 534         p_vpar->picture.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
 535
 536         /* composite_display_flag */
 537         if( GetBits( &p_vpar->bit_stream, 1 ) )
 538         {
 539             /* v_axis, field_sequence, sub_carrier, burst_amplitude,
 540              * sub_carrier_phase */
 541             RemoveBits( &p_vpar->bit_stream, 20 );
 542         }
 543     }
 544     else
 545     {
 546         /* MPEG-1 compatibility flags */
 547         p_vpar->picture.i_intra_dc_precision = 0; /* 8 bits */
 548         i_structure = FRAME_STRUCTURE;
 549         p_vpar->picture.b_top_field_first = 0;
 550         p_vpar->picture.b_frame_pred_frame_dct = 1;
 551         p_vpar->picture.b_concealment_mv = 0;
 552         p_vpar->picture.b_q_scale_type = 0;
 553         p_vpar->picture.b_intra_vlc_format = 0;
 554         p_vpar->picture.pi_scan = p_vpar->ppi_scan[0];
 555         p_vpar->picture.b_repeat_first_field = 0;
 556         p_vpar->picture.b_progressive = 1;
 557     }
 558
 559     /* Extension and User data. */
 560     ExtensionAndUserData( p_vpar );
 561
 562     p_vpar->pc_pictures[p_vpar->picture.i_coding_type]++;
 563
 564     if( p_vpar->picture.i_current_structure )
 565     {
 566         if ( (i_structure == FRAME_STRUCTURE ||
 567               i_structure == p_vpar->picture.i_current_structure) )
 568         {
 569             /* We don't have the second field of the buffered frame. */
 570             if( p_vpar->picture.p_picture != NULL )
 571             {
 572                 ReferenceReplace( p_vpar,
 573                                   p_vpar->picture.i_coding_type,
 574                                   NULL );
 575                 vout_DestroyPicture( p_vpar->p_vout,
 576                                      p_vpar->picture.p_picture );
 577                 p_vpar->picture.p_picture = NULL;
 578             }
 579
 580             p_vpar->picture.i_current_structure = 0;
 581
 582             intf_WarnMsg( 2, "Odd number of field pictures." );
 583         }
 584         else
 585         {
 586             /* Second field of a frame. We will decode it if, and only if we
 587              * have decoded the first field. */
 588             if( p_vpar->picture.p_picture == NULL )
 589             {
 590                 if( (p_vpar->picture.i_coding_type == I_CODING_TYPE
 591                       && p_vpar->sequence.p_backward == NULL) )
 592                 {
 593                     /* Exceptionnally, parse the picture if it is I. We need
 594                      * this in case of an odd number of field pictures, if the
 595                      * previous picture is not intra, we desperately need a
 596                      * new reference picture. OK, this is kind of kludgy. */
 597                     p_vpar->picture.i_current_structure = 0;
 598                 }
 599                 else
 600                 {
 601                     b_parsable = 0;
 602                 }
 603             }
 604             else
 605             {
 606                 /* We suppose we have the reference pictures, since we already
 607                  * decoded the first field and the second field will not need
 608                  * any extra reference picture. There is a special case of
 609                  * P field being the second field of an I field, but ISO/IEC
 610                  * 13818-2 section 7.6.3.5 specifies that this P field will
 611                  * not need any reference picture besides the I field. So far
 612                  * so good. */
 613                 b_parsable = 1;
 614
 615                 if( p_vpar->picture.i_coding_type == P_CODING_TYPE &&
 616                     i_previous_coding_type == I_CODING_TYPE &&
 617                     p_vpar->sequence.p_forward == NULL )
 618                 {
 619                     /* This is the special case of section 7.6.3.5. Create
 620                      * a fake reference picture (which will not be used)
 621                      * but will prevent us from segfaulting in the slice
 622                      * parsing. */
 623                     static picture_t    fake_picture;
 624                     fake_picture.p_data = NULL; /* We will use it later */
 625                     p_vpar->sequence.p_forward = &fake_picture;
 626                 }
 627             }
 628         }
 629     }
 630
 631     if( !p_vpar->picture.i_current_structure )
 632     {
 633         /* First field of a frame, or new frame picture. */
 634         int     i_repeat_field;
 635
 636         /* Do we have the reference pictures ? */
 637         b_parsable = !(((p_vpar->picture.i_coding_type == P_CODING_TYPE ||
 638                          p_vpar->picture.b_concealment_mv) &&
 639                         (p_vpar->sequence.p_backward == NULL)) ||
 640                          /* p_backward will become p_forward later */
 641                        ((p_vpar->picture.i_coding_type == B_CODING_TYPE) &&
 642                         (p_vpar->sequence.p_forward == NULL ||
 643                          p_vpar->sequence.p_backward == NULL)));
 644
 645         /* Compute the number of times the frame will be emitted by the
 646          * decoder (number of half-periods). */
 647         if( p_vpar->sequence.b_progressive )
 648         {
 649             i_repeat_field = (1 + p_vpar->picture.b_repeat_first_field
 650                                 + p_vpar->picture.b_top_field_first) * 2;
 651         }
 652         else
 653         {
 654             if( p_vpar->picture.b_progressive )
 655             {
 656                 i_repeat_field = 2 + p_vpar->picture.b_repeat_first_field;
 657             }
 658             else
 659             {
 660                 i_repeat_field = 2;
 661             }
 662         }
 663
 664         /* Warn synchro we have a new picture (updates pictures index). */
 665         vpar_SynchroNewPicture( p_vpar, p_vpar->picture.i_coding_type,
 666                                 i_repeat_field );
 667
 668         if( b_parsable )
 669         {
 670             /* Does synchro say we have enough time to decode it ? */
 671             b_parsable = vpar_SynchroChoose( p_vpar,
 672                                p_vpar->picture.i_coding_type, i_structure );
 673         }
 674     }
 675
 676     if( !b_parsable )
 677     {
 678         /* Update the reference pointers. */
 679         ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, NULL );
 680
 681         /* Update context. */
 682         if( i_structure != FRAME_STRUCTURE )
 683         {
 684             if( (p_vpar->picture.i_current_structure | i_structure)
 685                     == FRAME_STRUCTURE )
 686             {
 687                 /* The frame is complete. */
 688                 p_vpar->picture.i_current_structure = 0;
 689
 690                 vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
 691             }
 692             else
 693             {
 694                 p_vpar->picture.i_current_structure = i_structure;
 695             }
 696         }
 697         else
 698         {
 699             /* Warn Synchro we have trashed a picture. */
 700             vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
 701         }
 702         p_vpar->picture.p_picture = NULL;
 703
 704         return;
 705     }
 706
 707     /* OK, now we are sure we will decode the picture. */
 708     p_vpar->pc_decoded_pictures[p_vpar->picture.i_coding_type]++;
 709
 710 #define P_picture p_vpar->picture.p_picture
 711     p_vpar->picture.b_error = 0;
 712     p_vpar->picture.b_frame_structure = (i_structure == FRAME_STRUCTURE);
 713
 714     if( !p_vpar->picture.i_current_structure )
 715     {
 716         /* This is a new frame. Get a structure from the video_output. */
 717         while( ( P_picture = vout_CreatePicture( p_vpar->p_vout,
 718                               /* XXX */ 99+p_vpar->sequence.i_chroma_format,
 719                                         p_vpar->sequence.i_width,
 720                                         p_vpar->sequence.i_height ) )
 721              == NULL )
 722         {
 723             intf_DbgMsg("vpar debug: allocation error in vout_CreatePicture, delaying");
 724             if( p_vpar->p_fifo->b_die || p_vpar->p_fifo->b_error )
 725             {
 726                 return;
 727             }
 728             msleep( VPAR_OUTMEM_SLEEP );
 729         }
 730
 731         /* Initialize values. */
 732         vpar_SynchroDecode( p_vpar, p_vpar->picture.i_coding_type, i_structure );
 733         P_picture->i_aspect_ratio = p_vpar->sequence.i_aspect_ratio;
 734         P_picture->i_matrix_coefficients = p_vpar->sequence.i_matrix_coefficients;
 735         p_vpar->picture.i_field_width = ( p_vpar->sequence.i_width
 736                     << ( 1 - p_vpar->picture.b_frame_structure ) );
 737
 738 /* FIXME ! remove asap ?? */
 739 //memset( P_picture->p_data, 0, (p_vpar->sequence.i_mb_size*384));
 740
 741         /* Update the reference pointers. */
 742         ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, P_picture );
 743     }
 744
 745     /* Initialize picture data for decoding. */
 746     p_vpar->picture.i_current_structure |= i_structure;
 747     p_vpar->picture.i_structure = i_structure;
 748     p_vpar->picture.b_second_field =
 749         (i_structure != p_vpar->picture.i_current_structure);
 750     p_vpar->picture.b_current_field =
 751         (i_structure == BOTTOM_FIELD );
 752
 753     if( p_vpar->sequence.b_mpeg2 )
 754     {
 755         static f_picture_data_t ppf_picture_data[4][4] =
 756         {
 757             {
 758                 NULL, NULL, NULL, NULL
 759             },
 760             {
 761                 /* TOP_FIELD */
 762 #if (VPAR_OPTIM_LEVEL > 1)
 763                 NULL, vpar_PictureData2IT, vpar_PictureData2PT,
 764                 vpar_PictureData2BT
 765 #else
 766                 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
 767                 vpar_PictureDataGENERIC
 768 #endif
 769             },
 770             {
 771                 /* BOTTOM_FIELD */
 772 #if (VPAR_OPTIM_LEVEL > 1)
 773                 NULL, vpar_PictureData2IB, vpar_PictureData2PB,
 774                 vpar_PictureData2BB
 775 #else
 776                 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
 777                 vpar_PictureDataGENERIC
 778 #endif
 779             },
 780             {
 781                 /* FRAME_PICTURE */
 782 #if (VPAR_OPTIM_LEVEL > 0)
 783                 NULL, vpar_PictureData2IF, vpar_PictureData2PF,
 784                 vpar_PictureData2BF
 785 #else
 786                 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
 787                 vpar_PictureDataGENERIC
 788 #endif
 789             }
 790         };
 791
 792         ppf_picture_data[p_vpar->picture.i_structure]
 793                         [p_vpar->picture.i_coding_type]( p_vpar );
 794     }
 795     else
 796     {
 797 #if (VPAR_OPTIM_LEVEL > 1)
 798         static f_picture_data_t pf_picture_data[5] =
 799         { NULL, vpar_PictureData1I, vpar_PictureData1P, vpar_PictureData1B,
 800           vpar_PictureData1D };
 801
 802         pf_picture_data[p_vpar->picture.i_coding_type]( p_vpar );
 803 #else
 804         vpar_PictureDataGENERIC( p_vpar );
 805 #endif
 806     }
 807
 808     /* Wait for all the macroblocks to be decoded. */
 809     p_vpar->pool.pf_wait_pool( &p_vpar->pool );
 810
 811     /* Re-spawn decoder threads if the user changed settings. */
 812     vpar_SpawnPool( p_vpar );
 813
 814     if( p_vpar->p_fifo->b_die || p_vpar->p_fifo->b_error )
 815     {
 816         return;
 817     }
 818
 819     if( p_vpar->sequence.p_forward != NULL &&
 820         p_vpar->sequence.p_forward->p_data == NULL )
 821     {
 822         /* This can only happen with the fake picture created for section
 823          * 7.6.3.5. Clean up our mess. */
 824         p_vpar->sequence.p_forward = NULL;
 825     }
 826
 827     if( p_vpar->picture.b_error )
 828     {
 829         /* Trash picture. */
 830         p_vpar->pc_malformed_pictures[p_vpar->picture.i_coding_type]++;
 831
 832         vpar_SynchroEnd( p_vpar, p_vpar->picture.i_coding_type,
 833                          p_vpar->picture.i_structure, 1 );
 834         vout_DestroyPicture( p_vpar->p_vout, P_picture );
 835
 836         ReferenceReplace( p_vpar, p_vpar->picture.i_coding_type, NULL );
 837
 838         /* Prepare context for the next picture. */
 839         P_picture = NULL;
 840         if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
 841             p_vpar->picture.i_current_structure = 0;
 842     }
 843     else if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
 844     {
 845         /* Frame completely parsed. */
 846         vpar_SynchroEnd( p_vpar, p_vpar->picture.i_coding_type,
 847                          p_vpar->picture.i_structure, 0 );
 848         vout_DisplayPicture( p_vpar->p_vout, P_picture );
 849
 850         /* Prepare context for the next picture. */
 851         P_picture = NULL;
 852         p_vpar->picture.i_current_structure = 0;
 853     }
 854 #undef P_picture
 855 }
 856
 857 /*****************************************************************************
 858  * ExtensionAndUserData : Parse the extension_and_user_data structure
 859  *****************************************************************************/
 860 static void ExtensionAndUserData( vpar_thread_t * p_vpar )
 861 {
 862     while( !p_vpar->p_fifo->b_die )
 863     {
 864         NextStartCode( &p_vpar->bit_stream );
 865         switch( ShowBits( &p_vpar->bit_stream, 32 ) )
 866         {
 867         case EXTENSION_START_CODE:
 868             RemoveBits32( &p_vpar->bit_stream );
 869             switch( GetBits( &p_vpar->bit_stream, 4 ) )
 870             {
 871             case SEQUENCE_DISPLAY_EXTENSION_ID:
 872                 SequenceDisplayExtension( p_vpar );
 873                 break;
 874             case QUANT_MATRIX_EXTENSION_ID:
 875                 QuantMatrixExtension( p_vpar );
 876                 break;
 877             case SEQUENCE_SCALABLE_EXTENSION_ID:
 878                 SequenceScalableExtension( p_vpar );
 879                 break;
 880             case PICTURE_DISPLAY_EXTENSION_ID:
 881                 PictureDisplayExtension( p_vpar );
 882                 break;
 883             case PICTURE_SPATIAL_SCALABLE_EXTENSION_ID:
 884                 PictureSpatialScalableExtension( p_vpar );
 885                 break;
 886             case PICTURE_TEMPORAL_SCALABLE_EXTENSION_ID:
 887                 PictureTemporalScalableExtension( p_vpar );
 888                 break;
 889             case COPYRIGHT_EXTENSION_ID:
 890                 CopyrightExtension( p_vpar );
 891                 break;
 892             default:
 893                 break;
 894             }
 895             break;
 896
 897         case USER_DATA_START_CODE:
 898             RemoveBits32( &p_vpar->bit_stream );
 899             /* Wait for the next start code */
 900             break;
 901
 902         default:
 903             return;
 904         }
 905     }
 906 }
 907
 908
 909 /*****************************************************************************
 910  * SequenceDisplayExtension : Parse the sequence_display_extension structure *
 911  *****************************************************************************/
 912
 913 static void SequenceDisplayExtension( vpar_thread_t * p_vpar )
 914 {
 915     /* We don't care sequence_display_extension. */
 916     /* video_format */
 917     RemoveBits( &p_vpar->bit_stream, 3 );
 918     if( GetBits( &p_vpar->bit_stream, 1 ) )
 919     {
 920         /* Two bytes for color_desciption */
 921         RemoveBits( &p_vpar->bit_stream, 16 );
 922         p_vpar->sequence.i_matrix_coefficients = GetBits( &p_vpar->bit_stream, 8 );
 923     }
 924     /* display_horizontal and vertical_size and a marker_bit */
 925     RemoveBits( &p_vpar->bit_stream, 29 );
 926 }
 927
 928
 929 /*****************************************************************************
 930  * QuantMatrixExtension : Load quantization matrices for luminance           *
 931  *                        and chrominance                                    *
 932  *****************************************************************************/
 933
 934 static void QuantMatrixExtension( vpar_thread_t * p_vpar )
 935 {
 936     if( GetBits( &p_vpar->bit_stream, 1 ) )
 937     {
 938         /* Load intra_quantiser_matrix for luminance. */
 939         LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
 940     }
 941     else
 942     {
 943         /* Use the default matrix. */
 944         LinkMatrix( &p_vpar->sequence.intra_quant,
 945                     p_vpar->pi_default_intra_quant );
 946     }
 947     if( GetBits( &p_vpar->bit_stream, 1 ) )
 948     {
 949         /* Load non_intra_quantiser_matrix for luminance. */
 950         LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
 951     }
 952     else
 953     {
 954         /* Use the default matrix. */
 955         LinkMatrix( &p_vpar->sequence.nonintra_quant,
 956                     p_vpar->pi_default_nonintra_quant );
 957     }
 958     if( GetBits( &p_vpar->bit_stream, 1 ) )
 959     {
 960         /* Load intra_quantiser_matrix for chrominance. */
 961         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_intra_quant );
 962     }
 963     else
 964     {
 965         /* Link the chrominance intra matrix to the luminance one. */
 966         LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 967                     p_vpar->sequence.intra_quant.pi_matrix );
 968     }
 969     if( GetBits( &p_vpar->bit_stream, 1 ) )
 970     {
 971         /* Load non_intra_quantiser_matrix for chrominance. */
 972         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
 973     }
 974     else
 975     {
 976         /* Link the chrominance intra matrix to the luminance one. */
 977         LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
 978                     p_vpar->sequence.intra_quant.pi_matrix );
 979     }
 980     if( GetBits( &p_vpar->bit_stream, 1 ) )
 981     {
 982         /* Load non_intra_quantiser_matrix for chrominance. */
 983         LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
 984     }
 985     else
 986     {
 987         /* Link the chrominance nonintra matrix to the luminance one. */
 988         LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
 989                     p_vpar->sequence.nonintra_quant.pi_matrix );
 990     }
 991 }
 992
 993
 994 /*****************************************************************************
 995  * SequenceScalableExtension : Parse the sequence_scalable_extension         *
 996  *                             structure to handle scalable coding           *
 997  *****************************************************************************/
 998
 999 static void SequenceScalableExtension( vpar_thread_t * p_vpar )
1000 {
1001     /* We don't care about anything scalable except the scalable mode. */
1002     switch( p_vpar->sequence.i_scalable_mode = GetBits( &p_vpar->bit_stream, 2 ) )
1003     /* The length of the structure depends on the value of the scalable_mode */
1004     {
1005         case 1:
1006             RemoveBits32( &p_vpar->bit_stream );
1007             RemoveBits( &p_vpar->bit_stream, 21 );
1008             break;
1009         case 2:
1010             RemoveBits( &p_vpar->bit_stream, 12 );
1011             break;
1012         default:
1013             RemoveBits( &p_vpar->bit_stream, 4 );
1014     }
1015
1016 }
1017 /*****************************************************************************
1018  * PictureDisplayExtension : Parse the picture_display_extension structure   *
1019  *****************************************************************************/
1020
1021 static void PictureDisplayExtension( vpar_thread_t * p_vpar )
1022 {
1023     /* Number of frame center offset */
1024     int i_nb, i_dummy;
1025     /* I am not sure it works but it should
1026         (fewer tests than shown in §6.3.12) */
1027     i_nb = p_vpar->sequence.b_progressive ? p_vpar->sequence.b_progressive +
1028                                             p_vpar->picture.b_repeat_first_field +
1029                                             p_vpar->picture.b_top_field_first
1030                            : ( p_vpar->picture.b_frame_structure + 1 ) +
1031                              p_vpar->picture.b_repeat_first_field;
1032     for( i_dummy = 0; i_dummy < i_nb; i_dummy++ )
1033     {
1034         RemoveBits( &p_vpar->bit_stream, 17 );
1035         RemoveBits( &p_vpar->bit_stream, 17 );
1036     }
1037 }
1038
1039
1040 /*****************************************************************************
1041  * PictureSpatialScalableExtension                                           *
1042  *****************************************************************************/
1043
1044 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar )
1045 {
1046     /* That's scalable, so we trash it */
1047     RemoveBits32( &p_vpar->bit_stream );
1048     RemoveBits( &p_vpar->bit_stream, 16 );
1049 }
1050
1051
1052 /*****************************************************************************
1053  * PictureTemporalScalableExtension                                          *
1054  *****************************************************************************/
1055
1056 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar )
1057 {
1058     /* Scalable again, trashed again */
1059     RemoveBits( &p_vpar->bit_stream, 23 );
1060 }
1061
1062
1063 /*****************************************************************************
1064  * CopyrightExtension : Keeps some legal informations                        *
1065  *****************************************************************************/
1066
1067 static void CopyrightExtension( vpar_thread_t * p_vpar )
1068 {
1069     u32     i_copyright_nb_1, i_copyright_nb_2; /* local integers */
1070     p_vpar->sequence.b_copyright_flag = GetBits( &p_vpar->bit_stream, 1 );
1071         /* A flag that says whether the copyright information is significant */
1072     p_vpar->sequence.i_copyright_id = GetBits( &p_vpar->bit_stream, 8 );
1073         /* An identifier compliant with ISO/CEI JTC 1/SC 29 */
1074     p_vpar->sequence.b_original = GetBits( &p_vpar->bit_stream, 1 );
1075         /* Reserved bits */
1076     RemoveBits( &p_vpar->bit_stream, 8 );
1077         /* The copyright_number is split in three parts */
1078         /* first part */
1079     i_copyright_nb_1 = GetBits( &p_vpar->bit_stream, 20 );
1080     RemoveBits( &p_vpar->bit_stream, 1 );
1081         /* second part */
1082     i_copyright_nb_2 = GetBits( &p_vpar->bit_stream, 22 );
1083     RemoveBits( &p_vpar->bit_stream, 1 );
1084         /* third part and sum */
1085     p_vpar->sequence.i_copyright_nb = ( (u64)i_copyright_nb_1 << 44 ) |
1086                                       ( (u64)i_copyright_nb_2 << 22 ) |
1087                                       ( (u64)GetBits( &p_vpar->bit_stream, 22 ) );
1088 }