git.sesse.net Git - vlc/blob - modules/codec/libmpeg2.c

   1 /*****************************************************************************
   2  * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin@videolan.org>
   8  *          Christophe Massiot <massiot@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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31 #include <assert.h>
  32
  33 #include <vlc_common.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_codec.h>
  36 #include <vlc_block_helper.h>
  37 #include "../codec/cc.h"
  38
  39 #include <mpeg2.h>
  40
  41 #include <vlc_codec_synchro.h>
  42
  43 /*****************************************************************************
  44  * decoder_sys_t : libmpeg2 decoder descriptor
  45  *****************************************************************************/
  46 #define DPB_COUNT (3+1)
  47 typedef struct
  48 {
  49     picture_t *p_picture;
  50     bool      b_linked;
  51     bool      b_displayed;
  52 } picture_dpb_t;
  53
  54 struct decoder_sys_t
  55 {
  56     /*
  57      * libmpeg2 properties
  58      */
  59     mpeg2dec_t          *p_mpeg2dec;
  60     const mpeg2_info_t  *p_info;
  61     bool                b_skip;
  62
  63     /*
  64      * Input properties
  65      */
  66     mtime_t          i_previous_pts;
  67     mtime_t          i_current_pts;
  68     mtime_t          i_previous_dts;
  69     mtime_t          i_current_dts;
  70     bool             b_garbage_pic;
  71     bool             b_after_sequence_header; /* is it the next frame after
  72                                                * the sequence header ?    */
  73     bool             b_slice_i;             /* intra-slice refresh stream */
  74     bool             b_second_field;
  75
  76     bool             b_preroll;
  77
  78     /* */
  79     picture_dpb_t        p_dpb[DPB_COUNT];
  80
  81     /*
  82      * Output properties
  83      */
  84     decoder_synchro_t *p_synchro;
  85     int             i_aspect;
  86     int             i_sar_num;
  87     int             i_sar_den;
  88     mtime_t         i_last_frame_pts;
  89
  90     /* Closed captioning support */
  91     uint32_t        i_cc_flags;
  92     mtime_t         i_cc_pts;
  93     mtime_t         i_cc_dts;
  94     cc_data_t       cc;
  95     uint8_t        *p_gop_user_data;
  96     uint32_t        i_gop_user_data;
  97 };
  98
  99 /*****************************************************************************
 100  * Local prototypes
 101  *****************************************************************************/
 102 static int  OpenDecoder( vlc_object_t * );
 103 static void CloseDecoder( vlc_object_t * );
 104
 105 static picture_t *DecodeBlock( decoder_t *, block_t ** );
 106 static block_t   *GetCc( decoder_t *p_dec, bool pb_present[4] );
 107
 108 static picture_t *GetNewPicture( decoder_t * );
 109 static void PutPicture( decoder_t *, picture_t * );
 110
 111 static void GetAR( decoder_t *p_dec );
 112
 113 static void Reset( decoder_t *p_dec );
 114
 115 /* */
 116 static void DpbInit( decoder_t * );
 117 static void DpbClean( decoder_t * );
 118 static picture_t *DpbNewPicture( decoder_t * );
 119 static void DpbUnlinkPicture( decoder_t *, picture_t * );
 120 static int DpbDisplayPicture( decoder_t *, picture_t * );
 121
 122 /*****************************************************************************
 123  * Module descriptor
 124  *****************************************************************************/
 125 vlc_module_begin ()
 126     set_description( N_("MPEG I/II video decoder (using libmpeg2)") )
 127     set_capability( "decoder", 150 )
 128     set_category( CAT_INPUT )
 129     set_subcategory( SUBCAT_INPUT_VCODEC )
 130     set_callbacks( OpenDecoder, CloseDecoder )
 131     add_shortcut( "libmpeg2" )
 132 vlc_module_end ()
 133
 134 /*****************************************************************************
 135  * OpenDecoder: probe the decoder and return score
 136  *****************************************************************************/
 137 static int OpenDecoder( vlc_object_t *p_this )
 138 {
 139     decoder_t *p_dec = (decoder_t*)p_this;
 140     decoder_sys_t *p_sys;
 141     uint32_t i_accel = 0;
 142
 143     if( p_dec->fmt_in.i_codec != VLC_CODEC_MPGV )
 144         return VLC_EGENERIC;
 145
 146     /* Select onl recognized original format (standard mpeg video) */
 147     switch( p_dec->fmt_in.i_original_fourcc )
 148     {
 149     case VLC_FOURCC('m','p','g','1'):
 150     case VLC_FOURCC('m','p','g','2'):
 151     case VLC_FOURCC('m','p','g','v'):
 152     case VLC_FOURCC('P','I','M','1'):
 153     case VLC_FOURCC('h','d','v','2'):
 154         break;
 155     default:
 156         if( p_dec->fmt_in.i_original_fourcc )
 157             return VLC_EGENERIC;
 158         break;
 159     }
 160
 161     /* Allocate the memory needed to store the decoder's structure */
 162     if( ( p_dec->p_sys = p_sys = calloc( 1, sizeof(*p_sys)) ) == NULL )
 163         return VLC_ENOMEM;
 164
 165     /* Initialize the thread properties */
 166     p_sys->p_mpeg2dec = NULL;
 167     p_sys->p_synchro  = NULL;
 168     p_sys->p_info     = NULL;
 169     p_sys->i_current_pts  = 0;
 170     p_sys->i_previous_pts = 0;
 171     p_sys->i_current_dts  = 0;
 172     p_sys->i_previous_dts = 0;
 173     p_sys->b_garbage_pic = false;
 174     p_sys->b_slice_i  = false;
 175     p_sys->b_second_field = false;
 176     p_sys->b_skip     = false;
 177     p_sys->b_preroll = false;
 178     DpbInit( p_dec );
 179
 180     p_sys->i_cc_pts = 0;
 181     p_sys->i_cc_dts = 0;
 182     p_sys->i_cc_flags = 0;
 183 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 184     p_dec->pf_get_cc = GetCc;
 185     cc_Init( &p_sys->cc );
 186 #endif
 187     p_sys->p_gop_user_data = NULL;
 188     p_sys->i_gop_user_data = 0;
 189
 190 #if defined( __i386__ ) || defined( __x86_64__ )
 191     if( vlc_CPU() & CPU_CAPABILITY_MMX )
 192     {
 193         i_accel |= MPEG2_ACCEL_X86_MMX;
 194     }
 195
 196     if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
 197     {
 198         i_accel |= MPEG2_ACCEL_X86_3DNOW;
 199     }
 200
 201     if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
 202     {
 203         i_accel |= MPEG2_ACCEL_X86_MMXEXT;
 204     }
 205
 206 #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
 207     if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
 208     {
 209         i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
 210     }
 211
 212 #else
 213     /* If we do not know this CPU, trust libmpeg2's feature detection */
 214     i_accel = MPEG2_ACCEL_DETECT;
 215
 216 #endif
 217
 218     /* Set CPU acceleration features */
 219     mpeg2_accel( i_accel );
 220
 221     /* Initialize decoder */
 222     p_sys->p_mpeg2dec = mpeg2_init();
 223     if( p_sys->p_mpeg2dec == NULL)
 224     {
 225         msg_Err( p_dec, "mpeg2_init() failed" );
 226         free( p_sys );
 227         return VLC_EGENERIC;
 228     }
 229
 230     p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
 231
 232     p_dec->pf_decode_video = DecodeBlock;
 233     p_dec->fmt_out.i_cat = VIDEO_ES;
 234     p_dec->fmt_out.i_codec = 0;
 235
 236     return VLC_SUCCESS;
 237 }
 238
 239 /*****************************************************************************
 240  * RunDecoder: the libmpeg2 decoder
 241  *****************************************************************************/
 242 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 243 {
 244     decoder_sys_t   *p_sys = p_dec->p_sys;
 245     mpeg2_state_t   state;
 246     picture_t       *p_pic;
 247
 248     block_t *p_block;
 249
 250     if( !pp_block || !*pp_block )
 251         return NULL;
 252
 253     p_block = *pp_block;
 254     if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED) )
 255         Reset( p_dec );
 256
 257     while( 1 )
 258     {
 259         state = mpeg2_parse( p_sys->p_mpeg2dec );
 260
 261         switch( state )
 262         {
 263         case STATE_SEQUENCE:
 264         {
 265             /* */
 266             DpbClean( p_dec );
 267
 268             /* */
 269             mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 270
 271             /* Set the first 2 reference frames */
 272             GetAR( p_dec );
 273             for( int i = 0; i < 2; i++ )
 274             {
 275                 picture_t *p_picture = DpbNewPicture( p_dec );
 276                 if( !p_picture )
 277                 {
 278                     /* Is it ok ? or do we need a reset ? */
 279                     block_Release( p_block );
 280                     return NULL;
 281                 }
 282                 PutPicture( p_dec, p_picture );
 283             }
 284
 285             if( p_sys->p_synchro )
 286                 decoder_SynchroRelease( p_sys->p_synchro );
 287
 288             p_sys->p_synchro =
 289                 decoder_SynchroInit( p_dec, (uint32_t)((uint64_t)1001000000 * 27 /
 290                                      p_sys->p_info->sequence->frame_period) );
 291             p_sys->b_after_sequence_header = true;
 292             break;
 293         }
 294
 295         case STATE_GOP:
 296             /* There can be userdata in a GOP. It needs to be remembered for the next picture. */
 297             if( p_sys->p_info->user_data_len > 2 )
 298             {
 299                 free( p_sys->p_gop_user_data );
 300                 p_sys->p_gop_user_data = calloc( p_sys->p_info->user_data_len, sizeof(uint8_t) );
 301                 if( p_sys->p_gop_user_data )
 302                 {
 303                     p_sys->i_gop_user_data = p_sys->p_info->user_data_len;
 304                     memcpy( p_sys->p_gop_user_data, p_sys->p_info->user_data, p_sys->p_info->user_data_len );
 305                 }
 306             }
 307             break;
 308
 309         case STATE_PICTURE:
 310         {
 311             const mpeg2_info_t *p_info = p_sys->p_info;
 312             const mpeg2_picture_t *p_current = p_info->current_picture;
 313
 314             mtime_t i_pts, i_dts;
 315
 316             if( p_sys->b_after_sequence_header &&
 317                 (p_current->flags &
 318                     PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
 319             {
 320                 /* Intra-slice refresh. Simulate a blank I picture. */
 321                 msg_Dbg( p_dec, "intra-slice refresh stream" );
 322                 decoder_SynchroNewPicture( p_sys->p_synchro,
 323                                            I_CODING_TYPE, 2, 0, 0,
 324                                            p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 325                 decoder_SynchroDecode( p_sys->p_synchro );
 326                 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 327                 p_sys->b_slice_i = true;
 328             }
 329             p_sys->b_after_sequence_header = false;
 330
 331 #ifdef PIC_FLAG_PTS
 332             i_pts = p_current->flags & PIC_FLAG_PTS ?
 333                 ( ( p_current->pts ==
 334                     (uint32_t)p_sys->i_current_pts ) ?
 335                   p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 336             i_dts = 0;
 337
 338             /* Hack to handle demuxers which only have DTS timestamps */
 339             if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
 340             {
 341                 if( p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
 342                     (p_current->flags &
 343                       PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 344                 {
 345                     i_pts = p_block->i_dts;
 346                 }
 347             }
 348             p_block->i_pts = p_block->i_dts = 0;
 349             /* End hack */
 350
 351 #else /* New interface */
 352
 353             i_pts = p_current->flags & PIC_FLAG_TAGS ?
 354                 ( ( p_current->tag == (uint32_t)p_sys->i_current_pts ) ?
 355                             p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 356             i_dts = p_current->flags & PIC_FLAG_TAGS ?
 357                 ( ( p_current->tag2 == (uint32_t)p_sys->i_current_dts ) ?
 358                             p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
 359 #endif
 360
 361             /* If nb_fields == 1, it is a field picture, and it will be
 362              * followed by another field picture for which we won't call
 363              * decoder_SynchroNewPicture() because this would have other
 364              * problems, so we take it into account here.
 365              * This kind of sucks, but I didn't think better. --Meuuh
 366              */
 367             decoder_SynchroNewPicture( p_sys->p_synchro,
 368                                        p_current->flags & PIC_MASK_CODING_TYPE,
 369                                        p_current->nb_fields == 1 ? 2 :
 370                                        p_current->nb_fields, i_pts, i_dts,
 371                                        p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 372
 373
 374             bool b_skip = false;
 375             if( !p_dec->b_pace_control && !p_sys->b_preroll &&
 376                 !(p_sys->b_slice_i
 377                    && ((p_current->flags
 378                          & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P))
 379                    && !decoder_SynchroChoose( p_sys->p_synchro,
 380                               p_current->flags
 381                                 & PIC_MASK_CODING_TYPE,
 382                               /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
 383                               p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
 384             {
 385                 b_skip = true;
 386             }
 387
 388             p_pic = NULL;
 389             if( !b_skip )
 390             {
 391                 p_pic = DpbNewPicture( p_dec );
 392                 if( !p_pic )
 393                 {
 394                     Reset( p_dec );
 395                     block_Release( p_block );
 396                     return NULL;
 397                 }
 398             }
 399
 400             if( b_skip || !p_pic )
 401             {
 402                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 403                 p_sys->b_skip = true;
 404                 decoder_SynchroTrash( p_sys->p_synchro );
 405
 406                 PutPicture( p_dec, NULL );
 407
 408                 if( !b_skip )
 409                 {
 410                     block_Release( p_block );
 411                     return NULL;
 412                 }
 413             }
 414             else
 415             {
 416                 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
 417                 p_sys->b_skip = false;
 418                 decoder_SynchroDecode( p_sys->p_synchro );
 419
 420                 PutPicture( p_dec, p_pic );
 421             }
 422             if( p_info->user_data_len > 2 || p_sys->i_gop_user_data > 2 )
 423             {
 424                 p_sys->i_cc_pts = i_pts;
 425                 p_sys->i_cc_dts = i_dts;
 426                 if( (p_current->flags
 427                              & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
 428                     p_sys->i_cc_flags = BLOCK_FLAG_TYPE_P;
 429                 else if( (p_current->flags
 430                              & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 431                     p_sys->i_cc_flags = BLOCK_FLAG_TYPE_B;
 432                 else p_sys->i_cc_flags = BLOCK_FLAG_TYPE_I;
 433
 434                 if( p_sys->i_gop_user_data > 2 )
 435                 {
 436                     /* We now have picture info for any cached user_data out of the gop */
 437                     cc_Extract( &p_sys->cc, &p_sys->p_gop_user_data[0], p_sys->i_gop_user_data );
 438                     p_sys->i_gop_user_data = 0;
 439                 }
 440
 441                 /* Extract the CC from the user_data of the picture */
 442                 if( p_info->user_data_len > 2 )
 443                     cc_Extract( &p_sys->cc, &p_info->user_data[0], p_info->user_data_len );
 444             }
 445         }
 446         break;
 447
 448
 449         case STATE_BUFFER:
 450             if( !p_block->i_buffer )
 451             {
 452                 block_Release( p_block );
 453                 return NULL;
 454             }
 455
 456             if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
 457                                       | BLOCK_FLAG_CORRUPTED)) &&
 458                 p_sys->p_synchro &&
 459                 p_sys->p_info->sequence &&
 460                 p_sys->p_info->sequence->width != (unsigned)-1 )
 461             {
 462                 decoder_SynchroReset( p_sys->p_synchro );
 463                 if( p_sys->p_info->current_fbuf != NULL &&
 464                     p_sys->p_info->current_fbuf->id != NULL )
 465                 {
 466                     p_sys->b_garbage_pic = true;
 467                 }
 468                 if( p_sys->b_slice_i )
 469                 {
 470                     decoder_SynchroNewPicture( p_sys->p_synchro,
 471                                                I_CODING_TYPE, 2, 0, 0,
 472                                                p_sys->p_info->sequence->flags &
 473                                                             SEQ_FLAG_LOW_DELAY );
 474                     decoder_SynchroDecode( p_sys->p_synchro );
 475                     decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 476                 }
 477             }
 478
 479             if( p_block->i_flags & BLOCK_FLAG_PREROLL )
 480             {
 481                 p_sys->b_preroll = true;
 482             }
 483             else if( p_sys->b_preroll )
 484             {
 485                 p_sys->b_preroll = false;
 486                 if( p_sys->p_synchro )
 487                     decoder_SynchroReset( p_sys->p_synchro );
 488             }
 489
 490 #ifdef PIC_FLAG_PTS
 491             if( p_block->i_pts )
 492             {
 493                 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 494
 495 #else /* New interface */
 496             if( p_block->i_pts || p_block->i_dts )
 497             {
 498                 mpeg2_tag_picture( p_sys->p_mpeg2dec,
 499                                    (uint32_t)p_block->i_pts,
 500                                    (uint32_t)p_block->i_dts );
 501 #endif
 502                 p_sys->i_previous_pts = p_sys->i_current_pts;
 503                 p_sys->i_current_pts = p_block->i_pts;
 504                 p_sys->i_previous_dts = p_sys->i_current_dts;
 505                 p_sys->i_current_dts = p_block->i_dts;
 506             }
 507
 508             mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 509                           p_block->p_buffer + p_block->i_buffer );
 510
 511             p_block->i_buffer = 0;
 512             break;
 513
 514 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 515
 516         case STATE_SEQUENCE_MODIFIED:
 517             GetAR( p_dec );
 518             break;
 519 #endif
 520         case STATE_PICTURE_2ND:
 521             p_sys->b_second_field = true;
 522             break;
 523
 524
 525         case STATE_INVALID_END:
 526         case STATE_END:
 527         case STATE_SLICE:
 528             p_pic = NULL;
 529             if( p_sys->p_info->display_fbuf &&
 530                 p_sys->p_info->display_fbuf->id )
 531             {
 532                 p_pic = p_sys->p_info->display_fbuf->id;
 533                 if( DpbDisplayPicture( p_dec, p_pic ) )
 534                     p_pic = NULL;
 535
 536                 decoder_SynchroEnd( p_sys->p_synchro,
 537                                     p_sys->p_info->display_picture->flags & PIC_MASK_CODING_TYPE,
 538                                     p_sys->b_garbage_pic );
 539
 540                 if( p_pic )
 541                 {
 542                     p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
 543                     if( p_sys->b_garbage_pic )
 544                         p_pic->date = 0; /* ??? */
 545                     p_sys->b_garbage_pic = false;
 546                 }
 547             }
 548
 549             if( p_sys->p_info->discard_fbuf &&
 550                 p_sys->p_info->discard_fbuf->id )
 551             {
 552                 DpbUnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
 553             }
 554
 555             /* For still frames */
 556             if( state == STATE_END && p_pic )
 557                 p_pic->b_force = true;
 558
 559             if( p_pic )
 560             {
 561                 /* Avoid frames with identical timestamps.
 562                  * Especially needed for still frames in DVD menus. */
 563                 if( p_sys->i_last_frame_pts == p_pic->date )
 564                     p_pic->date++;
 565                 p_sys->i_last_frame_pts = p_pic->date;
 566                 return p_pic;
 567             }
 568             break;
 569
 570         case STATE_INVALID:
 571         {
 572             msg_Err( p_dec, "invalid picture encountered" );
 573             /* I don't think we have anything to do, but well without
 574              * docs ... */
 575             break;
 576         }
 577
 578         default:
 579             break;
 580         }
 581     }
 582
 583     /* Never reached */
 584     return NULL;
 585 }
 586
 587 /*****************************************************************************
 588  * CloseDecoder: libmpeg2 decoder destruction
 589  *****************************************************************************/
 590 static void CloseDecoder( vlc_object_t *p_this )
 591 {
 592     decoder_t *p_dec = (decoder_t *)p_this;
 593     decoder_sys_t *p_sys = p_dec->p_sys;
 594
 595     DpbClean( p_dec );
 596
 597     free( p_sys->p_gop_user_data );
 598
 599     if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
 600
 601     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 602
 603     free( p_sys );
 604 }
 605
 606 /*****************************************************************************
 607  * Reset: reset the decoder state
 608  *****************************************************************************/
 609 static void Reset( decoder_t *p_dec )
 610 {
 611     decoder_sys_t *p_sys = p_dec->p_sys;
 612
 613     cc_Flush( &p_sys->cc );
 614     mpeg2_reset( p_sys->p_mpeg2dec, p_sys->p_info->sequence != NULL );
 615     DpbClean( p_dec );
 616 }
 617
 618 /*****************************************************************************
 619  * GetNewPicture: Get a new picture from the vout and set the buf struct
 620  *****************************************************************************/
 621 static picture_t *GetNewPicture( decoder_t *p_dec )
 622 {
 623     decoder_sys_t *p_sys = p_dec->p_sys;
 624     picture_t *p_pic;
 625
 626     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
 627     p_dec->fmt_out.video.i_visible_width =
 628         p_sys->p_info->sequence->picture_width;
 629     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
 630     p_dec->fmt_out.video.i_visible_height =
 631         p_sys->p_info->sequence->picture_height;
 632     p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
 633     p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
 634     p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
 635
 636     if( p_sys->p_info->sequence->frame_period > 0 )
 637     {
 638         p_dec->fmt_out.video.i_frame_rate =
 639             (uint32_t)( (uint64_t)1001000000 * 27 /
 640                         p_sys->p_info->sequence->frame_period );
 641         p_dec->fmt_out.video.i_frame_rate_base = 1001;
 642     }
 643
 644     p_dec->fmt_out.i_codec =
 645         ( p_sys->p_info->sequence->chroma_height <
 646           p_sys->p_info->sequence->height ) ?
 647         VLC_CODEC_I420 : VLC_CODEC_I422;
 648
 649     /* Get a new picture */
 650     p_pic = decoder_NewPicture( p_dec );
 651
 652     if( p_pic == NULL )
 653         return NULL;
 654
 655     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
 656         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
 657     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
 658         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
 659     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
 660         p_sys->p_info->current_picture->nb_fields : 2;
 661
 662     return p_pic;
 663 }
 664
 665 /*****************************************************************************
 666  * GetCc: Retrieves the Closed Captions for the CC decoder.
 667  *****************************************************************************/
 668 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
 669 {
 670     decoder_sys_t   *p_sys = p_dec->p_sys;
 671     block_t         *p_cc = NULL;
 672     int i;
 673
 674     for( i = 0; i < 4; i++ )
 675         pb_present[i] = p_sys->cc.pb_present[i];
 676
 677     if( p_sys->cc.i_data <= 0 )
 678         return NULL;
 679
 680     p_cc = block_New( p_dec, p_sys->cc.i_data);
 681     if( p_cc )
 682     {
 683         memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
 684         p_cc->i_dts =
 685         p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
 686         p_cc->i_flags = ( p_sys->cc.b_reorder  ? p_sys->i_cc_flags : BLOCK_FLAG_TYPE_P ) & ( BLOCK_FLAG_TYPE_I|BLOCK_FLAG_TYPE_P|BLOCK_FLAG_TYPE_B);
 687     }
 688     cc_Flush( &p_sys->cc );
 689     return p_cc;
 690 }
 691
 692 /*****************************************************************************
 693  * GetAR: Get aspect ratio
 694  *****************************************************************************/
 695 static void GetAR( decoder_t *p_dec )
 696 {
 697     decoder_sys_t *p_sys = p_dec->p_sys;
 698
 699     /* Check whether the input gave a particular aspect ratio */
 700     if( p_dec->fmt_in.video.i_aspect )
 701     {
 702         p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
 703     }
 704     else
 705     {
 706         /* Use the value provided in the MPEG sequence header */
 707         if( p_sys->p_info->sequence->pixel_height > 0 )
 708         {
 709             p_sys->i_aspect =
 710                 ((uint64_t)p_sys->p_info->sequence->picture_width) *
 711                 p_sys->p_info->sequence->pixel_width *
 712                 VOUT_ASPECT_FACTOR /
 713                 p_sys->p_info->sequence->picture_height /
 714                 p_sys->p_info->sequence->pixel_height;
 715             p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
 716             p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
 717         }
 718         else
 719         {
 720             /* Invalid aspect, assume 4:3.
 721              * This shouldn't happen and if it does it is a bug
 722              * in libmpeg2 (likely triggered by an invalid stream) */
 723             p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 724             p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
 725             p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
 726         }
 727     }
 728
 729     msg_Dbg( p_dec, "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
 730              p_sys->p_info->sequence->picture_width,
 731              p_sys->p_info->sequence->picture_height,
 732              p_sys->p_info->sequence->display_width,
 733              p_sys->p_info->sequence->display_height,
 734              p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
 735              (uint32_t)((uint64_t)1001000000 * 27 /
 736                  p_sys->p_info->sequence->frame_period / 1001),
 737              (uint32_t)((uint64_t)1001000000 * 27 /
 738                  p_sys->p_info->sequence->frame_period % 1001) );
 739 }
 740
 741 /*****************************************************************************
 742  * PutPicture: Put a picture_t in mpeg2 context
 743  *****************************************************************************/
 744 static void PutPicture( decoder_t *p_dec, picture_t *p_picture )
 745 {
 746     decoder_sys_t *p_sys = p_dec->p_sys;
 747
 748     /* */
 749     uint8_t *pp_buf[3];
 750     for( int j = 0; j < 3; j++ )
 751         pp_buf[j] = p_picture ? p_picture->p[j].p_pixels : NULL;
 752     mpeg2_set_buf( p_sys->p_mpeg2dec, pp_buf, p_picture );
 753
 754     /* Completly broken API, why the hell does it suppose
 755      * the stride of the chroma planes ! */
 756     if( p_picture )
 757         mpeg2_stride( p_sys->p_mpeg2dec, p_picture->p[Y_PLANE].i_pitch );
 758 }
 759
 760
 761 /**
 762  * Initialize a virtual Decoded Picture Buffer to workaround
 763  * libmpeg2 deficient API
 764  */
 765 static void DpbInit( decoder_t *p_dec )
 766 {
 767     decoder_sys_t *p_sys = p_dec->p_sys;
 768
 769     for( int i = 0; i < DPB_COUNT; i++ )
 770         p_sys->p_dpb[i].p_picture = NULL;
 771 }
 772 /**
 773  * Empty and reset the current DPB
 774  */
 775 static void DpbClean( decoder_t *p_dec )
 776 {
 777     decoder_sys_t *p_sys = p_dec->p_sys;
 778
 779     for( int i = 0; i < DPB_COUNT; i++ )
 780     {
 781         picture_dpb_t *p = &p_sys->p_dpb[i];
 782         if( !p->p_picture )
 783             continue;
 784         if( p->b_linked )
 785             decoder_UnlinkPicture( p_dec, p->p_picture );
 786         if( !p->b_displayed )
 787             decoder_DeletePicture( p_dec, p->p_picture );
 788
 789         p->p_picture = NULL;
 790     }
 791 }
 792 /**
 793  * Retreive a picture and reserve a place in the DPB
 794  */
 795 static picture_t *DpbNewPicture( decoder_t *p_dec )
 796 {
 797     decoder_sys_t *p_sys = p_dec->p_sys;
 798
 799     picture_dpb_t *p;
 800     int i;
 801
 802     for( i = 0; i < DPB_COUNT; i++ )
 803     {
 804         p = &p_sys->p_dpb[i];
 805         if( !p->p_picture )
 806             break;
 807     }
 808     if( i >= DPB_COUNT )
 809     {
 810         msg_Err( p_dec, "Leaking picture" );
 811         return NULL;
 812     }
 813
 814     p->p_picture = GetNewPicture( p_dec );
 815     if( p->p_picture )
 816     {
 817         decoder_LinkPicture( p_dec, p->p_picture );
 818         p->b_linked = true;
 819         p->b_displayed = false;
 820
 821         p->p_picture->date = 0;
 822     }
 823     return p->p_picture;
 824 }
 825 static picture_dpb_t *DpbFindPicture( decoder_t *p_dec, picture_t *p_picture )
 826 {
 827     decoder_sys_t *p_sys = p_dec->p_sys;
 828
 829     for( int i = 0; i < DPB_COUNT; i++ )
 830     {
 831         picture_dpb_t *p = &p_sys->p_dpb[i];
 832         if( p->p_picture == p_picture )
 833             return p;
 834     }
 835     return NULL;
 836 }
 837 /**
 838  * Unlink the provided picture and ensure that the decoder
 839  * does not own it anymore.
 840  */
 841 static void DpbUnlinkPicture( decoder_t *p_dec, picture_t *p_picture )
 842 {
 843     picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
 844
 845     /* XXX it is needed to workaround libmpeg2 bugs */
 846     if( !p || !p->b_linked )
 847     {
 848         msg_Err( p_dec, "DpbUnlinkPicture called on an invalid picture" );
 849         return;
 850     }
 851
 852     assert( p && p->b_linked );
 853
 854     decoder_UnlinkPicture( p_dec, p->p_picture );
 855     p->b_linked = false;
 856
 857     if( !p->b_displayed )
 858         decoder_DeletePicture( p_dec, p->p_picture );
 859     p->p_picture = NULL;
 860 }
 861 /**
 862  * Mark the provided picture as displayed.
 863  */
 864 static int DpbDisplayPicture( decoder_t *p_dec, picture_t *p_picture )
 865 {
 866     picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
 867
 868     /* XXX it is needed to workaround libmpeg2 bugs */
 869     if( !p || p->b_displayed || !p->b_linked )
 870     {
 871         msg_Err( p_dec, "DpbDisplayPicture called on an invalid picture" );
 872         return VLC_EGENERIC;
 873     }
 874
 875     assert( p && !p->b_displayed && p->b_linked );
 876
 877     p->b_displayed = true;
 878     return VLC_SUCCESS;
 879 }
 880
 881