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 <vlc_cpu.h>
  38 #include "../codec/cc.h"
  39
  40 #include <mpeg2.h>
  41
  42 #include <vlc_codec_synchro.h>
  43
  44 /*****************************************************************************
  45  * decoder_sys_t : libmpeg2 decoder descriptor
  46  *****************************************************************************/
  47 #define DPB_COUNT (3+1)
  48 typedef struct
  49 {
  50     picture_t *p_picture;
  51     bool      b_linked;
  52     bool      b_displayed;
  53 } picture_dpb_t;
  54
  55 struct decoder_sys_t
  56 {
  57     /*
  58      * libmpeg2 properties
  59      */
  60     mpeg2dec_t          *p_mpeg2dec;
  61     const mpeg2_info_t  *p_info;
  62     bool                b_skip;
  63
  64     /*
  65      * Input properties
  66      */
  67     mtime_t          i_previous_pts;
  68     mtime_t          i_current_pts;
  69     mtime_t          i_previous_dts;
  70     mtime_t          i_current_dts;
  71     bool             b_garbage_pic;
  72     bool             b_after_sequence_header; /* is it the next frame after
  73                                                * the sequence header ?    */
  74     bool             b_slice_i;             /* intra-slice refresh stream */
  75     bool             b_second_field;
  76
  77     bool             b_preroll;
  78
  79     /* */
  80     picture_dpb_t        p_dpb[DPB_COUNT];
  81
  82     /*
  83      * Output properties
  84      */
  85     decoder_synchro_t *p_synchro;
  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", 50 )
 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->i_sar_num = 0;
 176     p_sys->i_sar_den = 0;
 177     p_sys->b_garbage_pic = false;
 178     p_sys->b_slice_i  = false;
 179     p_sys->b_second_field = false;
 180     p_sys->b_skip     = false;
 181     p_sys->b_preroll = false;
 182     DpbInit( p_dec );
 183
 184     p_sys->i_cc_pts = 0;
 185     p_sys->i_cc_dts = 0;
 186     p_sys->i_cc_flags = 0;
 187 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 188     p_dec->pf_get_cc = GetCc;
 189     cc_Init( &p_sys->cc );
 190 #endif
 191     p_sys->p_gop_user_data = NULL;
 192     p_sys->i_gop_user_data = 0;
 193
 194 #if defined( __i386__ ) || defined( __x86_64__ )
 195     if( vlc_CPU_MMX() )
 196         i_accel |= MPEG2_ACCEL_X86_MMX;
 197     if( vlc_CPU_3dNOW() )
 198         i_accel |= MPEG2_ACCEL_X86_3DNOW;
 199     if( vlc_CPU_MMXEXT() )
 200         i_accel |= MPEG2_ACCEL_X86_MMXEXT;
 201 #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
 202     if( vlc_CPU_ALTIVEC() )
 203         i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
 204
 205 #elif defined(__arm__)
 206 # ifdef MPEG2_ACCEL_ARM
 207     i_accel |= MPEG2_ACCEL_ARM;
 208 # endif
 209 # ifdef MPEG2_ACCEL_ARM_NEON
 210     if( vlc_CPU_ARM_NEON() )
 211         i_accel |= MPEG2_ACCEL_ARM_NEON;
 212 # endif
 213
 214     /* TODO: sparc */
 215 #else
 216     /* If we do not know this CPU, trust libmpeg2's feature detection */
 217     i_accel = MPEG2_ACCEL_DETECT;
 218
 219 #endif
 220
 221     /* Set CPU acceleration features */
 222     mpeg2_accel( i_accel );
 223
 224     /* Initialize decoder */
 225     p_sys->p_mpeg2dec = mpeg2_init();
 226     if( p_sys->p_mpeg2dec == NULL)
 227     {
 228         msg_Err( p_dec, "mpeg2_init() failed" );
 229         free( p_sys );
 230         return VLC_EGENERIC;
 231     }
 232
 233     p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
 234
 235     p_dec->pf_decode_video = DecodeBlock;
 236     p_dec->fmt_out.i_cat = VIDEO_ES;
 237     p_dec->fmt_out.i_codec = 0;
 238
 239     return VLC_SUCCESS;
 240 }
 241
 242 /*****************************************************************************
 243  * RunDecoder: the libmpeg2 decoder
 244  *****************************************************************************/
 245 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 246 {
 247     decoder_sys_t   *p_sys = p_dec->p_sys;
 248     mpeg2_state_t   state;
 249     picture_t       *p_pic;
 250
 251     block_t *p_block;
 252
 253     if( !pp_block || !*pp_block )
 254         return NULL;
 255
 256     p_block = *pp_block;
 257     if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED) )
 258         Reset( p_dec );
 259
 260     while( 1 )
 261     {
 262         state = mpeg2_parse( p_sys->p_mpeg2dec );
 263
 264         switch( state )
 265         {
 266         case STATE_SEQUENCE:
 267         {
 268             /* */
 269             DpbClean( p_dec );
 270
 271             /* */
 272             mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 273
 274             /* Set the first 2 reference frames */
 275             p_sys->i_sar_num = 0;
 276             p_sys->i_sar_den = 0;
 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                     Reset( p_dec );
 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                 bool b_top_field_first = p_sys->p_info->current_picture->flags
 448                                            & PIC_FLAG_TOP_FIELD_FIRST;
 449
 450                 if( p_sys->i_gop_user_data > 2 )
 451                 {
 452                     /* We now have picture info for any cached user_data out of the gop */
 453                     cc_Extract( &p_sys->cc, b_top_field_first,
 454                                 &p_sys->p_gop_user_data[0], p_sys->i_gop_user_data );
 455                     p_sys->i_gop_user_data = 0;
 456                 }
 457
 458                 /* Extract the CC from the user_data of the picture */
 459                 if( p_info->user_data_len > 2 )
 460                     cc_Extract( &p_sys->cc, b_top_field_first,
 461                                 &p_info->user_data[0], p_info->user_data_len );
 462             }
 463         }
 464         break;
 465
 466
 467         case STATE_BUFFER:
 468             if( !p_block->i_buffer )
 469             {
 470                 block_Release( p_block );
 471                 return NULL;
 472             }
 473
 474             if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
 475                                       | BLOCK_FLAG_CORRUPTED)) &&
 476                 p_sys->p_synchro &&
 477                 p_sys->p_info->sequence &&
 478                 p_sys->p_info->sequence->width != (unsigned)-1 )
 479             {
 480                 decoder_SynchroReset( p_sys->p_synchro );
 481                 if( p_sys->p_info->current_fbuf != NULL &&
 482                     p_sys->p_info->current_fbuf->id != NULL )
 483                 {
 484                     p_sys->b_garbage_pic = true;
 485                 }
 486                 if( p_sys->b_slice_i )
 487                 {
 488                     decoder_SynchroNewPicture( p_sys->p_synchro,
 489                                                I_CODING_TYPE, 2, 0, 0,
 490                                                p_sys->p_info->sequence->flags &
 491                                                             SEQ_FLAG_LOW_DELAY );
 492                     decoder_SynchroDecode( p_sys->p_synchro );
 493                     decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 494                 }
 495             }
 496
 497             if( p_block->i_flags & BLOCK_FLAG_PREROLL )
 498             {
 499                 p_sys->b_preroll = true;
 500             }
 501             else if( p_sys->b_preroll )
 502             {
 503                 p_sys->b_preroll = false;
 504                 if( p_sys->p_synchro )
 505                     decoder_SynchroReset( p_sys->p_synchro );
 506             }
 507
 508 #ifdef PIC_FLAG_PTS
 509             if( p_block->i_pts )
 510             {
 511                 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 512
 513 #else /* New interface */
 514             if( p_block->i_pts || p_block->i_dts )
 515             {
 516                 mpeg2_tag_picture( p_sys->p_mpeg2dec,
 517                                    (uint32_t)p_block->i_pts,
 518                                    (uint32_t)p_block->i_dts );
 519 #endif
 520                 p_sys->i_previous_pts = p_sys->i_current_pts;
 521                 p_sys->i_current_pts = p_block->i_pts;
 522                 p_sys->i_previous_dts = p_sys->i_current_dts;
 523                 p_sys->i_current_dts = p_block->i_dts;
 524             }
 525
 526             mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 527                           p_block->p_buffer + p_block->i_buffer );
 528
 529             p_block->i_buffer = 0;
 530             break;
 531
 532 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 533
 534         case STATE_SEQUENCE_MODIFIED:
 535             GetAR( p_dec );
 536             break;
 537 #endif
 538         case STATE_PICTURE_2ND:
 539             p_sys->b_second_field = true;
 540             break;
 541
 542
 543         case STATE_INVALID_END:
 544         case STATE_END:
 545         case STATE_SLICE:
 546             p_pic = NULL;
 547             if( p_sys->p_info->display_fbuf &&
 548                 p_sys->p_info->display_fbuf->id )
 549             {
 550                 p_pic = p_sys->p_info->display_fbuf->id;
 551                 if( DpbDisplayPicture( p_dec, p_pic ) )
 552                     p_pic = NULL;
 553
 554                 decoder_SynchroEnd( p_sys->p_synchro,
 555                                     p_sys->p_info->display_picture->flags & PIC_MASK_CODING_TYPE,
 556                                     p_sys->b_garbage_pic );
 557
 558                 if( p_pic )
 559                 {
 560                     p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
 561                     if( p_sys->b_garbage_pic )
 562                         p_pic->date = 0; /* ??? */
 563                     p_sys->b_garbage_pic = false;
 564                 }
 565             }
 566
 567             if( p_sys->p_info->discard_fbuf &&
 568                 p_sys->p_info->discard_fbuf->id )
 569             {
 570                 DpbUnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
 571             }
 572
 573             /* For still frames */
 574             if( state == STATE_END && p_pic )
 575                 p_pic->b_force = true;
 576
 577             if( p_pic )
 578             {
 579                 /* Avoid frames with identical timestamps.
 580                  * Especially needed for still frames in DVD menus. */
 581                 if( p_sys->i_last_frame_pts == p_pic->date )
 582                     p_pic->date++;
 583                 p_sys->i_last_frame_pts = p_pic->date;
 584                 return p_pic;
 585             }
 586             break;
 587
 588         case STATE_INVALID:
 589         {
 590             msg_Err( p_dec, "invalid picture encountered" );
 591             /* I don't think we have anything to do, but well without
 592              * docs ... */
 593             break;
 594         }
 595
 596         default:
 597             break;
 598         }
 599     }
 600
 601     /* Never reached */
 602     return NULL;
 603 }
 604
 605 /*****************************************************************************
 606  * CloseDecoder: libmpeg2 decoder destruction
 607  *****************************************************************************/
 608 static void CloseDecoder( vlc_object_t *p_this )
 609 {
 610     decoder_t *p_dec = (decoder_t *)p_this;
 611     decoder_sys_t *p_sys = p_dec->p_sys;
 612
 613     DpbClean( p_dec );
 614
 615     free( p_sys->p_gop_user_data );
 616
 617     if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
 618
 619     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 620
 621     free( p_sys );
 622 }
 623
 624 /*****************************************************************************
 625  * Reset: reset the decoder state
 626  *****************************************************************************/
 627 static void Reset( decoder_t *p_dec )
 628 {
 629     decoder_sys_t *p_sys = p_dec->p_sys;
 630
 631     cc_Flush( &p_sys->cc );
 632     mpeg2_reset( p_sys->p_mpeg2dec, 0 );
 633     DpbClean( p_dec );
 634 }
 635
 636 /*****************************************************************************
 637  * GetNewPicture: Get a new picture from the vout and set the buf struct
 638  *****************************************************************************/
 639 static picture_t *GetNewPicture( decoder_t *p_dec )
 640 {
 641     decoder_sys_t *p_sys = p_dec->p_sys;
 642     picture_t *p_pic;
 643
 644     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
 645     p_dec->fmt_out.video.i_visible_width =
 646         p_sys->p_info->sequence->picture_width;
 647     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
 648     p_dec->fmt_out.video.i_visible_height =
 649         p_sys->p_info->sequence->picture_height;
 650     p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
 651     p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
 652
 653     if( p_sys->p_info->sequence->frame_period > 0 )
 654     {
 655         p_dec->fmt_out.video.i_frame_rate =
 656             (uint32_t)( (uint64_t)1001000000 * 27 /
 657                         p_sys->p_info->sequence->frame_period );
 658         p_dec->fmt_out.video.i_frame_rate_base = 1001;
 659     }
 660
 661     p_dec->fmt_out.i_codec =
 662         ( p_sys->p_info->sequence->chroma_height <
 663           p_sys->p_info->sequence->height ) ?
 664         VLC_CODEC_I420 : VLC_CODEC_I422;
 665
 666     /* Get a new picture */
 667     p_pic = decoder_NewPicture( p_dec );
 668
 669     if( p_pic == NULL )
 670         return NULL;
 671
 672     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
 673         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
 674     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
 675         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
 676     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
 677         p_sys->p_info->current_picture->nb_fields : 2;
 678
 679     return p_pic;
 680 }
 681
 682 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 683 /*****************************************************************************
 684  * GetCc: Retrieves the Closed Captions for the CC decoder.
 685  *****************************************************************************/
 686 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
 687 {
 688     decoder_sys_t   *p_sys = p_dec->p_sys;
 689     block_t         *p_cc = NULL;
 690     int i;
 691
 692     for( i = 0; i < 4; i++ )
 693         pb_present[i] = p_sys->cc.pb_present[i];
 694
 695     if( p_sys->cc.i_data <= 0 )
 696         return NULL;
 697
 698     p_cc = block_New( p_dec, p_sys->cc.i_data);
 699     if( p_cc )
 700     {
 701         memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
 702         p_cc->i_dts =
 703         p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
 704         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);
 705     }
 706     cc_Flush( &p_sys->cc );
 707     return p_cc;
 708 }
 709 #endif
 710
 711 /*****************************************************************************
 712  * GetAR: Get aspect ratio
 713  *****************************************************************************/
 714 static void GetAR( decoder_t *p_dec )
 715 {
 716     decoder_sys_t *p_sys = p_dec->p_sys;
 717     int i_old_sar_num = p_sys->i_sar_num;
 718     int i_old_sar_den = p_sys->i_sar_den;
 719
 720     /* Check whether the input gave a particular aspect ratio */
 721     if( p_dec->fmt_in.video.i_sar_num > 0 &&
 722         p_dec->fmt_in.video.i_sar_den > 0 )
 723     {
 724         p_sys->i_sar_num = p_dec->fmt_in.video.i_sar_num;
 725         p_sys->i_sar_den = p_dec->fmt_in.video.i_sar_den;
 726     }
 727     else
 728     {
 729         /* Use the value provided in the MPEG sequence header */
 730         if( p_sys->p_info->sequence->pixel_height > 0 )
 731         {
 732             p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
 733             p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
 734         }
 735         else
 736         {
 737             /* Invalid aspect, assume 4:3.
 738              * This shouldn't happen and if it does it is a bug
 739              * in libmpeg2 (likely triggered by an invalid stream) */
 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->i_sar_num == i_old_sar_num &&
 746         p_sys->i_sar_den == i_old_sar_den )
 747         return;
 748
 749     if( p_sys->p_info->sequence->frame_period > 0 )
 750         msg_Dbg( p_dec,
 751                  "%dx%d (display %d,%d), sar %i:%i, %u.%03u fps",
 752                  p_sys->p_info->sequence->picture_width,
 753                  p_sys->p_info->sequence->picture_height,
 754                  p_sys->p_info->sequence->display_width,
 755                  p_sys->p_info->sequence->display_height,
 756                  p_sys->i_sar_num, p_sys->i_sar_den,
 757                  (uint32_t)((uint64_t)1001000000 * 27 /
 758                      p_sys->p_info->sequence->frame_period / 1001),
 759                  (uint32_t)((uint64_t)1001000000 * 27 /
 760                      p_sys->p_info->sequence->frame_period % 1001) );
 761     else
 762         msg_Dbg( p_dec, "bad frame period" );
 763 }
 764
 765 /*****************************************************************************
 766  * PutPicture: Put a picture_t in mpeg2 context
 767  *****************************************************************************/
 768 static void PutPicture( decoder_t *p_dec, picture_t *p_picture )
 769 {
 770     decoder_sys_t *p_sys = p_dec->p_sys;
 771
 772     /* */
 773     uint8_t *pp_buf[3];
 774     for( int j = 0; j < 3; j++ )
 775         pp_buf[j] = p_picture ? p_picture->p[j].p_pixels : NULL;
 776     mpeg2_set_buf( p_sys->p_mpeg2dec, pp_buf, p_picture );
 777
 778     /* Completly broken API, why the hell does it suppose
 779      * the stride of the chroma planes ! */
 780     if( p_picture )
 781         mpeg2_stride( p_sys->p_mpeg2dec, p_picture->p[Y_PLANE].i_pitch );
 782 }
 783
 784
 785 /**
 786  * Initialize a virtual Decoded Picture Buffer to workaround
 787  * libmpeg2 deficient API
 788  */
 789 static void DpbInit( decoder_t *p_dec )
 790 {
 791     decoder_sys_t *p_sys = p_dec->p_sys;
 792
 793     for( int i = 0; i < DPB_COUNT; i++ )
 794         p_sys->p_dpb[i].p_picture = NULL;
 795 }
 796 /**
 797  * Empty and reset the current DPB
 798  */
 799 static void DpbClean( decoder_t *p_dec )
 800 {
 801     decoder_sys_t *p_sys = p_dec->p_sys;
 802
 803     for( int i = 0; i < DPB_COUNT; i++ )
 804     {
 805         picture_dpb_t *p = &p_sys->p_dpb[i];
 806         if( !p->p_picture )
 807             continue;
 808         if( p->b_linked )
 809             decoder_UnlinkPicture( p_dec, p->p_picture );
 810         if( !p->b_displayed )
 811             decoder_DeletePicture( p_dec, p->p_picture );
 812
 813         p->p_picture = NULL;
 814     }
 815 }
 816 /**
 817  * Retreive a picture and reserve a place in the DPB
 818  */
 819 static picture_t *DpbNewPicture( decoder_t *p_dec )
 820 {
 821     decoder_sys_t *p_sys = p_dec->p_sys;
 822
 823     picture_dpb_t *p;
 824     int i;
 825
 826     for( i = 0; i < DPB_COUNT; i++ )
 827     {
 828         p = &p_sys->p_dpb[i];
 829         if( !p->p_picture )
 830             break;
 831     }
 832     if( i >= DPB_COUNT )
 833     {
 834         msg_Err( p_dec, "Leaking picture" );
 835         return NULL;
 836     }
 837
 838     p->p_picture = GetNewPicture( p_dec );
 839     if( p->p_picture )
 840     {
 841         decoder_LinkPicture( p_dec, p->p_picture );
 842         p->b_linked = true;
 843         p->b_displayed = false;
 844
 845         p->p_picture->date = 0;
 846     }
 847     return p->p_picture;
 848 }
 849 static picture_dpb_t *DpbFindPicture( decoder_t *p_dec, picture_t *p_picture )
 850 {
 851     decoder_sys_t *p_sys = p_dec->p_sys;
 852
 853     for( int i = 0; i < DPB_COUNT; i++ )
 854     {
 855         picture_dpb_t *p = &p_sys->p_dpb[i];
 856         if( p->p_picture == p_picture )
 857             return p;
 858     }
 859     return NULL;
 860 }
 861 /**
 862  * Unlink the provided picture and ensure that the decoder
 863  * does not own it anymore.
 864  */
 865 static void DpbUnlinkPicture( decoder_t *p_dec, picture_t *p_picture )
 866 {
 867     picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
 868
 869     /* XXX it is needed to workaround libmpeg2 bugs */
 870     if( !p || !p->b_linked )
 871     {
 872         msg_Err( p_dec, "DpbUnlinkPicture called on an invalid picture" );
 873         return;
 874     }
 875
 876     assert( p && p->b_linked );
 877
 878     decoder_UnlinkPicture( p_dec, p->p_picture );
 879     p->b_linked = false;
 880
 881     if( !p->b_displayed )
 882         decoder_DeletePicture( p_dec, p->p_picture );
 883     p->p_picture = NULL;
 884 }
 885 /**
 886  * Mark the provided picture as displayed.
 887  */
 888 static int DpbDisplayPicture( decoder_t *p_dec, picture_t *p_picture )
 889 {
 890     picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
 891
 892     /* XXX it is needed to workaround libmpeg2 bugs */
 893     if( !p || p->b_displayed || !p->b_linked )
 894     {
 895         msg_Err( p_dec, "DpbDisplayPicture called on an invalid picture" );
 896         return VLC_EGENERIC;
 897     }
 898
 899     assert( p && !p->b_displayed && p->b_linked );
 900
 901     p->b_displayed = true;
 902     return VLC_SUCCESS;
 903 }
 904
 905