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