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 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 107 static block_t   *GetCc( decoder_t *p_dec, bool pb_present[4] );
 108 #endif
 109
 110 static picture_t *GetNewPicture( decoder_t * );
 111 static void PutPicture( decoder_t *, picture_t * );
 112
 113 static void GetAR( decoder_t *p_dec );
 114
 115 static void Reset( decoder_t *p_dec );
 116
 117 /* */
 118 static void DpbInit( decoder_t * );
 119 static void DpbClean( decoder_t * );
 120 static picture_t *DpbNewPicture( decoder_t * );
 121 static void DpbUnlinkPicture( decoder_t *, picture_t * );
 122 static int DpbDisplayPicture( decoder_t *, picture_t * );
 123
 124 /*****************************************************************************
 125  * Module descriptor
 126  *****************************************************************************/
 127 vlc_module_begin ()
 128     set_description( N_("MPEG I/II video decoder (using libmpeg2)") )
 129     set_capability( "decoder", 150 )
 130     set_category( CAT_INPUT )
 131     set_subcategory( SUBCAT_INPUT_VCODEC )
 132     set_callbacks( OpenDecoder, CloseDecoder )
 133     add_shortcut( "libmpeg2" )
 134 vlc_module_end ()
 135
 136 /*****************************************************************************
 137  * OpenDecoder: probe the decoder and return score
 138  *****************************************************************************/
 139 static int OpenDecoder( vlc_object_t *p_this )
 140 {
 141     decoder_t *p_dec = (decoder_t*)p_this;
 142     decoder_sys_t *p_sys;
 143     uint32_t i_accel = 0;
 144
 145     if( p_dec->fmt_in.i_codec != VLC_CODEC_MPGV )
 146         return VLC_EGENERIC;
 147
 148     /* Select onl recognized original format (standard mpeg video) */
 149     switch( p_dec->fmt_in.i_original_fourcc )
 150     {
 151     case VLC_FOURCC('m','p','g','1'):
 152     case VLC_FOURCC('m','p','g','2'):
 153     case VLC_FOURCC('m','p','g','v'):
 154     case VLC_FOURCC('P','I','M','1'):
 155     case VLC_FOURCC('h','d','v','2'):
 156         break;
 157     default:
 158         if( p_dec->fmt_in.i_original_fourcc )
 159             return VLC_EGENERIC;
 160         break;
 161     }
 162
 163     /* Allocate the memory needed to store the decoder's structure */
 164     if( ( p_dec->p_sys = p_sys = calloc( 1, sizeof(*p_sys)) ) == NULL )
 165         return VLC_ENOMEM;
 166
 167     /* Initialize the thread properties */
 168     p_sys->p_mpeg2dec = NULL;
 169     p_sys->p_synchro  = NULL;
 170     p_sys->p_info     = NULL;
 171     p_sys->i_current_pts  = 0;
 172     p_sys->i_previous_pts = 0;
 173     p_sys->i_current_dts  = 0;
 174     p_sys->i_previous_dts = 0;
 175     p_sys->b_garbage_pic = false;
 176     p_sys->b_slice_i  = false;
 177     p_sys->b_second_field = false;
 178     p_sys->b_skip     = false;
 179     p_sys->b_preroll = false;
 180     DpbInit( p_dec );
 181
 182     p_sys->i_cc_pts = 0;
 183     p_sys->i_cc_dts = 0;
 184     p_sys->i_cc_flags = 0;
 185 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 186     p_dec->pf_get_cc = GetCc;
 187     cc_Init( &p_sys->cc );
 188 #endif
 189     p_sys->p_gop_user_data = NULL;
 190     p_sys->i_gop_user_data = 0;
 191
 192 #if defined( __i386__ ) || defined( __x86_64__ )
 193     if( vlc_CPU() & CPU_CAPABILITY_MMX )
 194     {
 195         i_accel |= MPEG2_ACCEL_X86_MMX;
 196     }
 197
 198     if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
 199     {
 200         i_accel |= MPEG2_ACCEL_X86_3DNOW;
 201     }
 202
 203     if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
 204     {
 205         i_accel |= MPEG2_ACCEL_X86_MMXEXT;
 206     }
 207
 208 #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
 209     if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
 210     {
 211         i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
 212     }
 213
 214 #elif defined(__arm__)
 215     i_accel |= MPEG2_ACCEL_ARM;
 216
 217 #else
 218     /* If we do not know this CPU, trust libmpeg2's feature detection */
 219     i_accel = MPEG2_ACCEL_DETECT;
 220
 221 #endif
 222
 223     /* Set CPU acceleration features */
 224     mpeg2_accel( i_accel );
 225
 226     /* Initialize decoder */
 227     p_sys->p_mpeg2dec = mpeg2_init();
 228     if( p_sys->p_mpeg2dec == NULL)
 229     {
 230         msg_Err( p_dec, "mpeg2_init() failed" );
 231         free( p_sys );
 232         return VLC_EGENERIC;
 233     }
 234
 235     p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
 236
 237     p_dec->pf_decode_video = DecodeBlock;
 238     p_dec->fmt_out.i_cat = VIDEO_ES;
 239     p_dec->fmt_out.i_codec = 0;
 240
 241     return VLC_SUCCESS;
 242 }
 243
 244 /*****************************************************************************
 245  * RunDecoder: the libmpeg2 decoder
 246  *****************************************************************************/
 247 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 248 {
 249     decoder_sys_t   *p_sys = p_dec->p_sys;
 250     mpeg2_state_t   state;
 251     picture_t       *p_pic;
 252
 253     block_t *p_block;
 254
 255     if( !pp_block || !*pp_block )
 256         return NULL;
 257
 258     p_block = *pp_block;
 259     if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED) )
 260         Reset( p_dec );
 261
 262     while( 1 )
 263     {
 264         state = mpeg2_parse( p_sys->p_mpeg2dec );
 265
 266         switch( state )
 267         {
 268         case STATE_SEQUENCE:
 269         {
 270             /* */
 271             DpbClean( p_dec );
 272
 273             /* */
 274             mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 275
 276             /* Set the first 2 reference frames */
 277             GetAR( p_dec );
 278             for( int i = 0; i < 2; i++ )
 279             {
 280                 picture_t *p_picture = DpbNewPicture( p_dec );
 281                 if( !p_picture )
 282                 {
 283                     /* Is it ok ? or do we need a reset ? */
 284                     block_Release( p_block );
 285                     return NULL;
 286                 }
 287                 PutPicture( p_dec, p_picture );
 288             }
 289
 290             if( p_sys->p_synchro )
 291                 decoder_SynchroRelease( p_sys->p_synchro );
 292
 293             if( p_sys->p_info->sequence->frame_period <= 0 )
 294                 p_sys->p_synchro = NULL;
 295             else
 296                 p_sys->p_synchro =
 297                 decoder_SynchroInit( p_dec, (uint32_t)(UINT64_C(1001000000) *
 298                                 27 / p_sys->p_info->sequence->frame_period) );
 299             p_sys->b_after_sequence_header = true;
 300             break;
 301         }
 302
 303         case STATE_GOP:
 304             /* There can be userdata in a GOP. It needs to be remembered for the next picture. */
 305             if( p_sys->p_info->user_data_len > 2 )
 306             {
 307                 free( p_sys->p_gop_user_data );
 308                 p_sys->p_gop_user_data = calloc( p_sys->p_info->user_data_len, sizeof(uint8_t) );
 309                 if( p_sys->p_gop_user_data )
 310                 {
 311                     p_sys->i_gop_user_data = p_sys->p_info->user_data_len;
 312                     memcpy( p_sys->p_gop_user_data, p_sys->p_info->user_data, p_sys->p_info->user_data_len );
 313                 }
 314             }
 315             break;
 316
 317         case STATE_PICTURE:
 318         {
 319             const mpeg2_info_t *p_info = p_sys->p_info;
 320             const mpeg2_picture_t *p_current = p_info->current_picture;
 321
 322             mtime_t i_pts, i_dts;
 323
 324             if( p_sys->b_after_sequence_header &&
 325                 (p_current->flags &
 326                     PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
 327             {
 328                 /* Intra-slice refresh. Simulate a blank I picture. */
 329                 msg_Dbg( p_dec, "intra-slice refresh stream" );
 330                 decoder_SynchroNewPicture( p_sys->p_synchro,
 331                                            I_CODING_TYPE, 2, 0, 0,
 332                                            p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 333                 decoder_SynchroDecode( p_sys->p_synchro );
 334                 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 335                 p_sys->b_slice_i = true;
 336             }
 337             p_sys->b_after_sequence_header = false;
 338
 339 #ifdef PIC_FLAG_PTS
 340             i_pts = p_current->flags & PIC_FLAG_PTS ?
 341                 ( ( p_current->pts ==
 342                     (uint32_t)p_sys->i_current_pts ) ?
 343                   p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 344             i_dts = 0;
 345
 346             /* Hack to handle demuxers which only have DTS timestamps */
 347             if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
 348             {
 349                 if( p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
 350                     (p_current->flags &
 351                       PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 352                 {
 353                     i_pts = p_block->i_dts;
 354                 }
 355             }
 356             p_block->i_pts = p_block->i_dts = 0;
 357             /* End hack */
 358
 359 #else /* New interface */
 360
 361             i_pts = p_current->flags & PIC_FLAG_TAGS ?
 362                 ( ( p_current->tag == (uint32_t)p_sys->i_current_pts ) ?
 363                             p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 364             i_dts = p_current->flags & PIC_FLAG_TAGS ?
 365                 ( ( p_current->tag2 == (uint32_t)p_sys->i_current_dts ) ?
 366                             p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
 367 #endif
 368
 369             /* If nb_fields == 1, it is a field picture, and it will be
 370              * followed by another field picture for which we won't call
 371              * decoder_SynchroNewPicture() because this would have other
 372              * problems, so we take it into account here.
 373              * This kind of sucks, but I didn't think better. --Meuuh
 374              */
 375             decoder_SynchroNewPicture( p_sys->p_synchro,
 376                                        p_current->flags & PIC_MASK_CODING_TYPE,
 377                                        p_current->nb_fields == 1 ? 2 :
 378                                        p_current->nb_fields, i_pts, i_dts,
 379                                        p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 380
 381
 382             bool b_skip = false;
 383             if( !p_dec->b_pace_control && !p_sys->b_preroll &&
 384                 !(p_sys->b_slice_i
 385                    && ((p_current->flags
 386                          & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P))
 387                    && !decoder_SynchroChoose( p_sys->p_synchro,
 388                               p_current->flags
 389                                 & PIC_MASK_CODING_TYPE,
 390                               /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
 391                               p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
 392             {
 393                 b_skip = true;
 394             }
 395
 396             p_pic = NULL;
 397             if( !b_skip )
 398             {
 399                 p_pic = DpbNewPicture( p_dec );
 400                 if( !p_pic )
 401                 {
 402                     Reset( p_dec );
 403
 404                     p_pic = DpbNewPicture( p_dec );
 405                     if( !p_pic )
 406                     {
 407                         mpeg2_reset( p_sys->p_mpeg2dec, 1 );
 408                         block_Release( p_block );
 409                         return NULL;
 410                     }
 411                 }
 412             }
 413
 414             if( b_skip || !p_pic )
 415             {
 416                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 417                 p_sys->b_skip = true;
 418                 decoder_SynchroTrash( p_sys->p_synchro );
 419
 420                 PutPicture( p_dec, NULL );
 421
 422                 if( !b_skip )
 423                 {
 424                     block_Release( p_block );
 425                     return NULL;
 426                 }
 427             }
 428             else
 429             {
 430                 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
 431                 p_sys->b_skip = false;
 432                 decoder_SynchroDecode( p_sys->p_synchro );
 433
 434                 PutPicture( p_dec, p_pic );
 435             }
 436             if( p_info->user_data_len > 2 || p_sys->i_gop_user_data > 2 )
 437             {
 438                 p_sys->i_cc_pts = i_pts;
 439                 p_sys->i_cc_dts = i_dts;
 440                 if( (p_current->flags
 441                              & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
 442                     p_sys->i_cc_flags = BLOCK_FLAG_TYPE_P;
 443                 else if( (p_current->flags
 444                              & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 445                     p_sys->i_cc_flags = BLOCK_FLAG_TYPE_B;
 446                 else p_sys->i_cc_flags = BLOCK_FLAG_TYPE_I;
 447
 448                 if( p_sys->i_gop_user_data > 2 )
 449                 {
 450                     /* We now have picture info for any cached user_data out of the gop */
 451                     cc_Extract( &p_sys->cc, &p_sys->p_gop_user_data[0], p_sys->i_gop_user_data );
 452                     p_sys->i_gop_user_data = 0;
 453                 }
 454
 455                 /* Extract the CC from the user_data of the picture */
 456                 if( p_info->user_data_len > 2 )
 457                     cc_Extract( &p_sys->cc, &p_info->user_data[0], p_info->user_data_len );
 458             }
 459         }
 460         break;
 461
 462
 463         case STATE_BUFFER:
 464             if( !p_block->i_buffer )
 465             {
 466                 block_Release( p_block );
 467                 return NULL;
 468             }
 469
 470             if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
 471                                       | BLOCK_FLAG_CORRUPTED)) &&
 472                 p_sys->p_synchro &&
 473                 p_sys->p_info->sequence &&
 474                 p_sys->p_info->sequence->width != (unsigned)-1 )
 475             {
 476                 decoder_SynchroReset( p_sys->p_synchro );
 477                 if( p_sys->p_info->current_fbuf != NULL &&
 478                     p_sys->p_info->current_fbuf->id != NULL )
 479                 {
 480                     p_sys->b_garbage_pic = true;
 481                 }
 482                 if( p_sys->b_slice_i )
 483                 {
 484                     decoder_SynchroNewPicture( p_sys->p_synchro,
 485                                                I_CODING_TYPE, 2, 0, 0,
 486                                                p_sys->p_info->sequence->flags &
 487                                                             SEQ_FLAG_LOW_DELAY );
 488                     decoder_SynchroDecode( p_sys->p_synchro );
 489                     decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 490                 }
 491             }
 492
 493             if( p_block->i_flags & BLOCK_FLAG_PREROLL )
 494             {
 495                 p_sys->b_preroll = true;
 496             }
 497             else if( p_sys->b_preroll )
 498             {
 499                 p_sys->b_preroll = false;
 500                 if( p_sys->p_synchro )
 501                     decoder_SynchroReset( p_sys->p_synchro );
 502             }
 503
 504 #ifdef PIC_FLAG_PTS
 505             if( p_block->i_pts )
 506             {
 507                 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 508
 509 #else /* New interface */
 510             if( p_block->i_pts || p_block->i_dts )
 511             {
 512                 mpeg2_tag_picture( p_sys->p_mpeg2dec,
 513                                    (uint32_t)p_block->i_pts,
 514                                    (uint32_t)p_block->i_dts );
 515 #endif
 516                 p_sys->i_previous_pts = p_sys->i_current_pts;
 517                 p_sys->i_current_pts = p_block->i_pts;
 518                 p_sys->i_previous_dts = p_sys->i_current_dts;
 519                 p_sys->i_current_dts = p_block->i_dts;
 520             }
 521
 522             mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 523                           p_block->p_buffer + p_block->i_buffer );
 524
 525             p_block->i_buffer = 0;
 526             break;
 527
 528 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 529
 530         case STATE_SEQUENCE_MODIFIED:
 531             GetAR( p_dec );
 532             break;
 533 #endif
 534         case STATE_PICTURE_2ND:
 535             p_sys->b_second_field = true;
 536             break;
 537
 538
 539         case STATE_INVALID_END:
 540         case STATE_END:
 541         case STATE_SLICE:
 542             p_pic = NULL;
 543             if( p_sys->p_info->display_fbuf &&
 544                 p_sys->p_info->display_fbuf->id )
 545             {
 546                 p_pic = p_sys->p_info->display_fbuf->id;
 547                 if( DpbDisplayPicture( p_dec, p_pic ) )
 548                     p_pic = NULL;
 549
 550                 decoder_SynchroEnd( p_sys->p_synchro,
 551                                     p_sys->p_info->display_picture->flags & PIC_MASK_CODING_TYPE,
 552                                     p_sys->b_garbage_pic );
 553
 554                 if( p_pic )
 555                 {
 556                     p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
 557                     if( p_sys->b_garbage_pic )
 558                         p_pic->date = 0; /* ??? */
 559                     p_sys->b_garbage_pic = false;
 560                 }
 561             }
 562
 563             if( p_sys->p_info->discard_fbuf &&
 564                 p_sys->p_info->discard_fbuf->id )
 565             {
 566                 DpbUnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
 567             }
 568
 569             /* For still frames */
 570             if( state == STATE_END && p_pic )
 571                 p_pic->b_force = true;
 572
 573             if( p_pic )
 574             {
 575                 /* Avoid frames with identical timestamps.
 576                  * Especially needed for still frames in DVD menus. */
 577                 if( p_sys->i_last_frame_pts == p_pic->date )
 578                     p_pic->date++;
 579                 p_sys->i_last_frame_pts = p_pic->date;
 580                 return p_pic;
 581             }
 582             break;
 583
 584         case STATE_INVALID:
 585         {
 586             msg_Err( p_dec, "invalid picture encountered" );
 587             /* I don't think we have anything to do, but well without
 588              * docs ... */
 589             break;
 590         }
 591
 592         default:
 593             break;
 594         }
 595     }
 596
 597     /* Never reached */
 598     return NULL;
 599 }
 600
 601 /*****************************************************************************
 602  * CloseDecoder: libmpeg2 decoder destruction
 603  *****************************************************************************/
 604 static void CloseDecoder( vlc_object_t *p_this )
 605 {
 606     decoder_t *p_dec = (decoder_t *)p_this;
 607     decoder_sys_t *p_sys = p_dec->p_sys;
 608
 609     DpbClean( p_dec );
 610
 611     free( p_sys->p_gop_user_data );
 612
 613     if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
 614
 615     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 616
 617     free( p_sys );
 618 }
 619
 620 /*****************************************************************************
 621  * Reset: reset the decoder state
 622  *****************************************************************************/
 623 static void Reset( decoder_t *p_dec )
 624 {
 625     decoder_sys_t *p_sys = p_dec->p_sys;
 626
 627     cc_Flush( &p_sys->cc );
 628     mpeg2_reset( p_sys->p_mpeg2dec, 0 );
 629     DpbClean( p_dec );
 630 }
 631
 632 /*****************************************************************************
 633  * GetNewPicture: Get a new picture from the vout and set the buf struct
 634  *****************************************************************************/
 635 static picture_t *GetNewPicture( decoder_t *p_dec )
 636 {
 637     decoder_sys_t *p_sys = p_dec->p_sys;
 638     picture_t *p_pic;
 639
 640     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
 641     p_dec->fmt_out.video.i_visible_width =
 642         p_sys->p_info->sequence->picture_width;
 643     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
 644     p_dec->fmt_out.video.i_visible_height =
 645         p_sys->p_info->sequence->picture_height;
 646     p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
 647     p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
 648     p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
 649
 650     if( p_sys->p_info->sequence->frame_period > 0 )
 651     {
 652         p_dec->fmt_out.video.i_frame_rate =
 653             (uint32_t)( (uint64_t)1001000000 * 27 /
 654                         p_sys->p_info->sequence->frame_period );
 655         p_dec->fmt_out.video.i_frame_rate_base = 1001;
 656     }
 657
 658     p_dec->fmt_out.i_codec =
 659         ( p_sys->p_info->sequence->chroma_height <
 660           p_sys->p_info->sequence->height ) ?
 661         VLC_CODEC_I420 : VLC_CODEC_I422;
 662
 663     /* Get a new picture */
 664     p_pic = decoder_NewPicture( p_dec );
 665
 666     if( p_pic == NULL )
 667         return NULL;
 668
 669     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
 670         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
 671     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
 672         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
 673     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
 674         p_sys->p_info->current_picture->nb_fields : 2;
 675
 676     return p_pic;
 677 }
 678
 679 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 680 /*****************************************************************************
 681  * GetCc: Retrieves the Closed Captions for the CC decoder.
 682  *****************************************************************************/
 683 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
 684 {
 685     decoder_sys_t   *p_sys = p_dec->p_sys;
 686     block_t         *p_cc = NULL;
 687     int i;
 688
 689     for( i = 0; i < 4; i++ )
 690         pb_present[i] = p_sys->cc.pb_present[i];
 691
 692     if( p_sys->cc.i_data <= 0 )
 693         return NULL;
 694
 695     p_cc = block_New( p_dec, p_sys->cc.i_data);
 696     if( p_cc )
 697     {
 698         memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
 699         p_cc->i_dts =
 700         p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
 701         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);
 702     }
 703     cc_Flush( &p_sys->cc );
 704     return p_cc;
 705 }
 706 #endif
 707
 708 /*****************************************************************************
 709  * GetAR: Get aspect ratio
 710  *****************************************************************************/
 711 static void GetAR( decoder_t *p_dec )
 712 {
 713     decoder_sys_t *p_sys = p_dec->p_sys;
 714
 715     /* Check whether the input gave a particular aspect ratio */
 716     if( p_dec->fmt_in.video.i_aspect )
 717     {
 718         p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
 719     }
 720     else
 721     {
 722         /* Use the value provided in the MPEG sequence header */
 723         if( p_sys->p_info->sequence->pixel_height > 0 )
 724         {
 725             p_sys->i_aspect =
 726                 ((uint64_t)p_sys->p_info->sequence->picture_width) *
 727                 p_sys->p_info->sequence->pixel_width *
 728                 VOUT_ASPECT_FACTOR /
 729                 p_sys->p_info->sequence->picture_height /
 730                 p_sys->p_info->sequence->pixel_height;
 731             p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
 732             p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
 733         }
 734         else
 735         {
 736             /* Invalid aspect, assume 4:3.
 737              * This shouldn't happen and if it does it is a bug
 738              * in libmpeg2 (likely triggered by an invalid stream) */
 739             p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 740             p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
 741             p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
 742         }
 743     }
 744
 745     if( p_sys->p_info->sequence->frame_period > 0 )
 746         msg_Dbg( p_dec,
 747                  "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
 748                  p_sys->p_info->sequence->picture_width,
 749                  p_sys->p_info->sequence->picture_height,
 750                  p_sys->p_info->sequence->display_width,
 751                  p_sys->p_info->sequence->display_height,
 752                  p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
 753                  (uint32_t)((uint64_t)1001000000 * 27 /
 754                      p_sys->p_info->sequence->frame_period / 1001),
 755                  (uint32_t)((uint64_t)1001000000 * 27 /
 756                      p_sys->p_info->sequence->frame_period % 1001) );
 757     else
 758         msg_Dbg( p_dec, "bad frame period" );
 759 }
 760
 761 /*****************************************************************************
 762  * PutPicture: Put a picture_t in mpeg2 context
 763  *****************************************************************************/
 764 static void PutPicture( decoder_t *p_dec, picture_t *p_picture )
 765 {
 766     decoder_sys_t *p_sys = p_dec->p_sys;
 767
 768     /* */
 769     uint8_t *pp_buf[3];
 770     for( int j = 0; j < 3; j++ )
 771         pp_buf[j] = p_picture ? p_picture->p[j].p_pixels : NULL;
 772     mpeg2_set_buf( p_sys->p_mpeg2dec, pp_buf, p_picture );
 773
 774     /* Completly broken API, why the hell does it suppose
 775      * the stride of the chroma planes ! */
 776     if( p_picture )
 777         mpeg2_stride( p_sys->p_mpeg2dec, p_picture->p[Y_PLANE].i_pitch );
 778 }
 779
 780
 781 /**
 782  * Initialize a virtual Decoded Picture Buffer to workaround
 783  * libmpeg2 deficient API
 784  */
 785 static void DpbInit( decoder_t *p_dec )
 786 {
 787     decoder_sys_t *p_sys = p_dec->p_sys;
 788
 789     for( int i = 0; i < DPB_COUNT; i++ )
 790         p_sys->p_dpb[i].p_picture = NULL;
 791 }
 792 /**
 793  * Empty and reset the current DPB
 794  */
 795 static void DpbClean( decoder_t *p_dec )
 796 {
 797     decoder_sys_t *p_sys = p_dec->p_sys;
 798
 799     for( int i = 0; i < DPB_COUNT; i++ )
 800     {
 801         picture_dpb_t *p = &p_sys->p_dpb[i];
 802         if( !p->p_picture )
 803             continue;
 804         if( p->b_linked )
 805             decoder_UnlinkPicture( p_dec, p->p_picture );
 806         if( !p->b_displayed )
 807             decoder_DeletePicture( p_dec, p->p_picture );
 808
 809         p->p_picture = NULL;
 810     }
 811 }
 812 /**
 813  * Retreive a picture and reserve a place in the DPB
 814  */
 815 static picture_t *DpbNewPicture( decoder_t *p_dec )
 816 {
 817     decoder_sys_t *p_sys = p_dec->p_sys;
 818
 819     picture_dpb_t *p;
 820     int i;
 821
 822     for( i = 0; i < DPB_COUNT; i++ )
 823     {
 824         p = &p_sys->p_dpb[i];
 825         if( !p->p_picture )
 826             break;
 827     }
 828     if( i >= DPB_COUNT )
 829     {
 830         msg_Err( p_dec, "Leaking picture" );
 831         return NULL;
 832     }
 833
 834     p->p_picture = GetNewPicture( p_dec );
 835     if( p->p_picture )
 836     {
 837         decoder_LinkPicture( p_dec, p->p_picture );
 838         p->b_linked = true;
 839         p->b_displayed = false;
 840
 841         p->p_picture->date = 0;
 842     }
 843     return p->p_picture;
 844 }
 845 static picture_dpb_t *DpbFindPicture( decoder_t *p_dec, picture_t *p_picture )
 846 {
 847     decoder_sys_t *p_sys = p_dec->p_sys;
 848
 849     for( int i = 0; i < DPB_COUNT; i++ )
 850     {
 851         picture_dpb_t *p = &p_sys->p_dpb[i];
 852         if( p->p_picture == p_picture )
 853             return p;
 854     }
 855     return NULL;
 856 }
 857 /**
 858  * Unlink the provided picture and ensure that the decoder
 859  * does not own it anymore.
 860  */
 861 static void DpbUnlinkPicture( decoder_t *p_dec, picture_t *p_picture )
 862 {
 863     picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
 864
 865     /* XXX it is needed to workaround libmpeg2 bugs */
 866     if( !p || !p->b_linked )
 867     {
 868         msg_Err( p_dec, "DpbUnlinkPicture called on an invalid picture" );
 869         return;
 870     }
 871
 872     assert( p && p->b_linked );
 873
 874     decoder_UnlinkPicture( p_dec, p->p_picture );
 875     p->b_linked = false;
 876
 877     if( !p->b_displayed )
 878         decoder_DeletePicture( p_dec, p->p_picture );
 879     p->p_picture = NULL;
 880 }
 881 /**
 882  * Mark the provided picture as displayed.
 883  */
 884 static int DpbDisplayPicture( decoder_t *p_dec, picture_t *p_picture )
 885 {
 886     picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
 887
 888     /* XXX it is needed to workaround libmpeg2 bugs */
 889     if( !p || p->b_displayed || !p->b_linked )
 890     {
 891         msg_Err( p_dec, "DpbDisplayPicture called on an invalid picture" );
 892         return VLC_EGENERIC;
 893     }
 894
 895     assert( p && !p->b_displayed && p->b_linked );
 896
 897     p->b_displayed = true;
 898     return VLC_SUCCESS;
 899 }
 900
 901