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 VideoLAN
   5  * $Id: libmpeg2.c,v 1.26 2003/09/02 20:19:25 gbazin Exp $
   6  *
   7  * Authors: Gildas Bazin <gbazin@netcourrier.com>
   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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <vlc/vlc.h>
  29 #include <vlc/vout.h>
  30 #include <vlc/input.h>
  31 #include <vlc/decoder.h>
  32
  33 #include <stdlib.h>                                      /* malloc(), free() */
  34 #include <string.h>                                    /* memcpy(), memset() */
  35
  36 #include <mpeg2dec/mpeg2.h>
  37
  38 #include "vout_synchro.h"
  39
  40 /* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */
  41 #define AR_SQUARE_PICTURE       1                           /* square pixels */
  42 #define AR_3_4_PICTURE          2                        /* 3:4 picture (TV) */
  43 #define AR_16_9_PICTURE         3              /* 16:9 picture (wide screen) */
  44 #define AR_221_1_PICTURE        4                  /* 2.21:1 picture (movie) */
  45
  46 /*****************************************************************************
  47  * decoder_sys_t : libmpeg2 decoder descriptor
  48  *****************************************************************************/
  49 struct decoder_sys_t
  50 {
  51     /*
  52      * libmpeg2 properties
  53      */
  54     mpeg2dec_t          *p_mpeg2dec;
  55     const mpeg2_info_t  *p_info;
  56     vlc_bool_t          b_skip;
  57
  58     /*
  59      * Input properties
  60      */
  61     pes_packet_t     *p_pes;                  /* current PES we are decoding */
  62     mtime_t          i_pts;
  63     mtime_t          i_previous_pts;
  64     mtime_t          i_current_pts;
  65     mtime_t          i_period_remainder;
  66     int              i_current_rate;
  67     picture_t *      p_picture_to_destroy;
  68     vlc_bool_t       b_garbage_pic;
  69     vlc_bool_t       b_after_sequence_header; /* is it the next frame after
  70                                                * the sequence header ?    */
  71     vlc_bool_t       b_slice_i;             /* intra-slice refresh stream */
  72
  73     /*
  74      * Output properties
  75      */
  76     vout_thread_t *p_vout;
  77     vout_synchro_t *p_synchro;
  78
  79 };
  80
  81 /*****************************************************************************
  82  * Local prototypes
  83  *****************************************************************************/
  84 static int  OpenDecoder  ( vlc_object_t * );
  85 static int  InitDecoder  ( decoder_t * );
  86 static int  RunDecoder   ( decoder_t *, block_t * );
  87 static int  EndDecoder   ( decoder_t * );
  88
  89 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
  90
  91 /*****************************************************************************
  92  * Module descriptor
  93  *****************************************************************************/
  94 vlc_module_begin();
  95     set_description( _("MPEG I/II video decoder (using libmpeg2)") );
  96     set_capability( "decoder", 150 );
  97     set_callbacks( OpenDecoder, NULL );
  98     add_shortcut( "libmpeg2" );
  99 vlc_module_end();
 100
 101 /*****************************************************************************
 102  * OpenDecoder: probe the decoder and return score
 103  *****************************************************************************/
 104 static int OpenDecoder( vlc_object_t *p_this )
 105 {
 106     decoder_t *p_dec = (decoder_t*)p_this;
 107
 108     if( p_dec->p_fifo->i_fourcc != VLC_FOURCC('m','p','g','v') &&
 109         p_dec->p_fifo->i_fourcc != VLC_FOURCC('m','p','g','1') &&
 110         p_dec->p_fifo->i_fourcc != VLC_FOURCC('m','p','g','2') )
 111     {
 112         return VLC_EGENERIC;
 113     }
 114
 115     p_dec->pf_init = InitDecoder;
 116     p_dec->pf_decode = RunDecoder;
 117     p_dec->pf_end = EndDecoder;
 118
 119     return VLC_SUCCESS;
 120 }
 121
 122 /*****************************************************************************
 123  * InitDecoder: Initalize the decoder
 124  *****************************************************************************/
 125 static int InitDecoder( decoder_t *p_dec )
 126 {
 127     /* Allocate the memory needed to store the decoder's structure */
 128     if( ( p_dec->p_sys =
 129           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
 130     {
 131         msg_Err( p_dec, "out of memory" );
 132         return VLC_EGENERIC;
 133     }
 134
 135     /* Initialize the thread properties */
 136     memset( p_dec->p_sys, 0, sizeof(decoder_sys_t) );
 137     p_dec->p_sys->p_pes      = NULL;
 138     p_dec->p_sys->p_vout     = NULL;
 139     p_dec->p_sys->p_mpeg2dec = NULL;
 140     p_dec->p_sys->p_synchro  = NULL;
 141     p_dec->p_sys->p_info     = NULL;
 142     p_dec->p_sys->i_pts      = mdate() + DEFAULT_PTS_DELAY;
 143     p_dec->p_sys->i_current_pts  = 0;
 144     p_dec->p_sys->i_previous_pts = 0;
 145     p_dec->p_sys->i_period_remainder = 0;
 146     p_dec->p_sys->p_picture_to_destroy = NULL;
 147     p_dec->p_sys->b_garbage_pic = 0;
 148     p_dec->p_sys->b_slice_i  = 0;
 149     p_dec->p_sys->b_skip     = 0;
 150
 151     /* Initialize decoder */
 152     p_dec->p_sys->p_mpeg2dec = mpeg2_init();
 153     if( p_dec->p_sys->p_mpeg2dec == NULL)
 154     {
 155         msg_Err( p_dec, "mpeg2_init() failed" );
 156         free( p_dec->p_sys );
 157         return VLC_EGENERIC;
 158     }
 159
 160     p_dec->p_sys->p_info = mpeg2_info( p_dec->p_sys->p_mpeg2dec );
 161
 162     return VLC_SUCCESS;
 163 }
 164
 165 /*****************************************************************************
 166  * RunDecoder: the libmpeg2 decoder
 167  *****************************************************************************/
 168 static int RunDecoder( decoder_t *p_dec, block_t *p_block )
 169 {
 170     decoder_sys_t   *p_sys = p_dec->p_sys;
 171     mpeg2_state_t   state;
 172     picture_t       *p_pic;
 173     int             i_aspect;
 174
 175     vlc_bool_t      b_need_more_data = VLC_FALSE;
 176
 177     while( 1 )
 178     {
 179         state = mpeg2_parse( p_sys->p_mpeg2dec );
 180
 181         switch( state )
 182         {
 183         case STATE_BUFFER:
 184                 if( !p_block->i_buffer || b_need_more_data )
 185                 {
 186                     block_Release( p_block );
 187                     return VLC_SUCCESS;
 188                 }
 189
 190 #if 0
 191                 if( p_pes->b_discontinuity && p_sys->p_synchro
 192                      && p_sys->p_info->sequence->width != (unsigned)-1 )
 193                 {
 194                     vout_SynchroReset( p_sys->p_synchro );
 195                     if ( p_sys->p_info->current_fbuf != NULL
 196                           && p_sys->p_info->current_fbuf->id != NULL )
 197                     {
 198                         p_sys->b_garbage_pic = 1;
 199                         p_pic = p_sys->p_info->current_fbuf->id;
 200                     }
 201                     else
 202                     {
 203                         uint8_t *buf[3];
 204                         buf[0] = buf[1] = buf[2] = NULL;
 205                         if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 206                             break;
 207                         mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 208                     }
 209                     p_sys->p_picture_to_destroy = p_pic;
 210
 211                     memset( p_pic->p[0].p_pixels, 0,
 212                             p_sys->p_info->sequence->width
 213                              * p_sys->p_info->sequence->height );
 214                     memset( p_pic->p[1].p_pixels, 0x80,
 215                             p_sys->p_info->sequence->width
 216                              * p_sys->p_info->sequence->height / 4 );
 217                     memset( p_pic->p[2].p_pixels, 0x80,
 218                             p_sys->p_info->sequence->width
 219                              * p_sys->p_info->sequence->height / 4 );
 220
 221                     if ( p_sys->b_slice_i )
 222                     {
 223                         vout_SynchroNewPicture( p_sys->p_synchro,
 224                             I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 225                         vout_SynchroDecode( p_sys->p_synchro );
 226                         vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 227                     }
 228                 }
 229 #endif
 230
 231             if( p_block->i_pts )
 232             {
 233                 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 234                 p_sys->i_previous_pts = p_sys->i_current_pts;
 235                 p_sys->i_current_pts = p_block->i_pts;
 236             }
 237
 238             p_sys->i_current_rate = DEFAULT_RATE;//p_pes->i_rate;
 239
 240             mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 241                           p_block->p_buffer + p_block->i_buffer );
 242
 243             b_need_more_data = VLC_TRUE;
 244             break;
 245
 246         case STATE_SEQUENCE:
 247         {
 248             /* Initialize video output */
 249             uint8_t *buf[3];
 250             buf[0] = buf[1] = buf[2] = NULL;
 251
 252             /* Check whether the input gives a particular aspect ratio */
 253             if( p_dec->p_fifo->p_demux_data
 254                 && ( *(int*)(p_dec->p_fifo->p_demux_data) & 0x7 ) )
 255             {
 256                 i_aspect = *(int*)(p_dec->p_fifo->p_demux_data);
 257                 switch( i_aspect )
 258                 {
 259                 case AR_3_4_PICTURE:
 260                     i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 261                     break;
 262                 case AR_16_9_PICTURE:
 263                     i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
 264                     break;
 265                 case AR_221_1_PICTURE:
 266                     i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
 267                     break;
 268                 case AR_SQUARE_PICTURE:
 269                 default:
 270                     i_aspect = VOUT_ASPECT_FACTOR *
 271                                    p_sys->p_info->sequence->width /
 272                                    p_sys->p_info->sequence->height;
 273                     break;
 274                 }
 275             }
 276             else
 277             {
 278                 /* Use the value provided in the MPEG sequence header */
 279                 i_aspect = ((uint64_t)p_sys->p_info->sequence->display_width) *
 280                     p_sys->p_info->sequence->pixel_width * VOUT_ASPECT_FACTOR /
 281                     p_sys->p_info->sequence->display_height /
 282                     p_sys->p_info->sequence->pixel_height;
 283             }
 284
 285             if ( p_dec->p_sys->p_vout != NULL )
 286             {
 287               int i_pic;
 288                 /* Temporary hack to free the pictures in use by libmpeg2 */
 289                 for ( i_pic = 0; i_pic < p_dec->p_sys->p_vout->render.i_pictures; i_pic++ )
 290                 {
 291                     if( p_dec->p_sys->p_vout->render.pp_picture[i_pic]->i_status ==
 292                           RESERVED_PICTURE )
 293                         vout_DestroyPicture( p_dec->p_sys->p_vout,
 294                                          p_dec->p_sys->p_vout->render.pp_picture[i_pic] );
 295                     if( p_dec->p_sys->p_vout->render.pp_picture[i_pic]->i_refcount > 0 )
 296                         vout_UnlinkPicture( p_dec->p_sys->p_vout,
 297                                          p_dec->p_sys->p_vout->render.pp_picture[i_pic] );
 298                 }
 299             }
 300
 301             p_sys->p_vout = vout_Request( p_dec, p_sys->p_vout,
 302                                           p_sys->p_info->sequence->width,
 303                                           p_sys->p_info->sequence->height,
 304                                           VLC_FOURCC('Y','V','1','2'),
 305                                           i_aspect );
 306
 307             if(p_sys->p_vout == NULL )
 308             {
 309                 msg_Err( p_dec, "cannot create vout" );
 310                 block_Release( p_block );
 311                 return -1;
 312             }
 313
 314             msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
 315                      p_sys->p_info->sequence->width,
 316                      p_sys->p_info->sequence->height, i_aspect,
 317                      (uint32_t)((u64)1001000000 * 27 /
 318                      p_sys->p_info->sequence->frame_period / 1001),
 319                      (uint32_t)((u64)1001000000 * 27 /
 320                      p_sys->p_info->sequence->frame_period % 1001) );
 321
 322             mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 323
 324             /* Set the first 2 reference frames */
 325             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 326
 327             if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break;
 328             memset( p_pic->p[0].p_pixels, 0,
 329                     p_sys->p_info->sequence->width
 330                      * p_sys->p_info->sequence->height );
 331             memset( p_pic->p[1].p_pixels, 0x80,
 332                     p_sys->p_info->sequence->width
 333                      * p_sys->p_info->sequence->height / 4 );
 334             memset( p_pic->p[2].p_pixels, 0x80,
 335                     p_sys->p_info->sequence->width
 336                      * p_sys->p_info->sequence->height / 4 );
 337             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 338             /* This picture will never go through display_picture. */
 339             vout_DatePicture( p_sys->p_vout, p_pic, 0 );
 340             vout_DisplayPicture( p_sys->p_vout, p_pic );
 341             /* For some reason, libmpeg2 will put this pic twice in
 342              * discard_picture. This can be considered a bug in libmpeg2. */
 343             vout_LinkPicture( p_sys->p_vout, p_pic );
 344
 345             if ( p_sys->p_synchro )
 346             {
 347                 vout_SynchroRelease( p_sys->p_synchro );
 348             }
 349             p_sys->p_synchro = vout_SynchroInit( p_dec, p_sys->p_vout,
 350                 (uint32_t)((uint64_t)1001000000 * 27 /
 351                 p_sys->p_info->sequence->frame_period) );
 352             p_sys->b_after_sequence_header = 1;
 353         }
 354         break;
 355
 356         case STATE_PICTURE_2ND:
 357             vout_SynchroNewPicture( p_sys->p_synchro,
 358                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 359                 p_sys->p_info->current_picture->nb_fields,
 360                 0, 0,
 361                 p_sys->i_current_rate );
 362
 363             if ( p_sys->b_skip )
 364             {
 365                 vout_SynchroTrash( p_sys->p_synchro );
 366             }
 367             else
 368             {
 369                 vout_SynchroDecode( p_sys->p_synchro );
 370             }
 371             break;
 372
 373         case STATE_PICTURE:
 374         {
 375             uint8_t *buf[3];
 376             buf[0] = buf[1] = buf[2] = NULL;
 377
 378             if ( p_sys->b_after_sequence_header
 379                   && ((p_sys->p_info->current_picture->flags
 380                         & PIC_MASK_CODING_TYPE)
 381                        == PIC_FLAG_CODING_TYPE_P) )
 382             {
 383                 /* Intra-slice refresh. Simulate a blank I picture. */
 384                 msg_Dbg( p_dec, "intra-slice refresh stream" );
 385                 vout_SynchroNewPicture( p_sys->p_synchro,
 386                     I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 387                 vout_SynchroDecode( p_sys->p_synchro );
 388                 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 389                 p_sys->b_slice_i = 1;
 390             }
 391             p_sys->b_after_sequence_header = 0;
 392
 393             vout_SynchroNewPicture( p_sys->p_synchro,
 394                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 395                 p_sys->p_info->current_picture->nb_fields,
 396                 (p_sys->p_info->current_picture->flags & PIC_FLAG_PTS) ?
 397                     ( ( p_sys->p_info->current_picture->pts ==
 398                         (uint32_t)p_sys->i_current_pts ) ?
 399                       p_sys->i_current_pts : p_sys->i_previous_pts ) : 0,
 400                 0, p_sys->i_current_rate );
 401
 402             if ( !(p_sys->b_slice_i
 403                    && ((p_sys->p_info->current_picture->flags
 404                          & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
 405                    && !vout_SynchroChoose( p_sys->p_synchro,
 406                               p_sys->p_info->current_picture->flags
 407                                 & PIC_MASK_CODING_TYPE ) )
 408             {
 409                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 410                 p_sys->b_skip = 1;
 411                 vout_SynchroTrash( p_sys->p_synchro );
 412                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 413             }
 414             else
 415             {
 416                 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
 417                 p_sys->b_skip = 0;
 418                 vout_SynchroDecode( p_sys->p_synchro );
 419                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break;
 420                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 421             }
 422         }
 423         break;
 424
 425         case STATE_END:
 426         case STATE_SLICE:
 427             if( p_sys->p_info->display_fbuf
 428                 && p_sys->p_info->display_fbuf->id )
 429             {
 430                 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
 431
 432                 vout_SynchroEnd( p_sys->p_synchro,
 433                             p_sys->p_info->display_picture->flags
 434                              & PIC_MASK_CODING_TYPE,
 435                             p_sys->b_garbage_pic );
 436                 p_sys->b_garbage_pic = 0;
 437                 vout_DisplayPicture( p_sys->p_vout, p_pic );
 438
 439                 if ( p_sys->p_picture_to_destroy != p_pic )
 440                 {
 441                     vout_DatePicture( p_sys->p_vout, p_pic,
 442                         vout_SynchroDate( p_sys->p_synchro ) );
 443                 }
 444                 else
 445                 {
 446                     p_sys->p_picture_to_destroy = NULL;
 447                     vout_DatePicture( p_sys->p_vout, p_pic, 0 );
 448                 }
 449             }
 450
 451             if( p_sys->p_info->discard_fbuf &&
 452                 p_sys->p_info->discard_fbuf->id )
 453             {
 454                 p_pic = (picture_t *)p_sys->p_info->discard_fbuf->id;
 455                 vout_UnlinkPicture( p_sys->p_vout, p_pic );
 456             }
 457             break;
 458
 459         case STATE_INVALID:
 460         {
 461             uint8_t *buf[3];
 462             buf[0] = buf[1] = buf[2] = NULL;
 463
 464             msg_Warn( p_dec, "invalid picture encountered" );
 465             if ( ( p_sys->p_info->current_picture == NULL ) ||
 466                ( ( p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE)
 467                   != B_CODING_TYPE ) )
 468             {
 469                 vout_SynchroReset( p_sys->p_synchro );
 470             }
 471             mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 472             p_sys->b_skip = 1;
 473
 474             if( p_sys->p_info->current_fbuf &&
 475                 p_sys->p_info->current_fbuf->id )
 476             {
 477                 p_sys->b_garbage_pic = 1;
 478                 p_pic = p_sys->p_info->current_fbuf->id;
 479             }
 480             else
 481             {
 482                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 483                     break;
 484                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 485             }
 486             p_sys->p_picture_to_destroy = p_pic;
 487
 488             memset( p_pic->p[0].p_pixels, 0,
 489                     p_sys->p_info->sequence->width
 490                      * p_sys->p_info->sequence->height );
 491             memset( p_pic->p[1].p_pixels, 0x80,
 492                     p_sys->p_info->sequence->width
 493                      * p_sys->p_info->sequence->height / 4 );
 494             memset( p_pic->p[2].p_pixels, 0x80,
 495                     p_sys->p_info->sequence->width
 496                      * p_sys->p_info->sequence->height / 4 );
 497
 498             if ( p_sys->b_slice_i )
 499             {
 500                 vout_SynchroNewPicture( p_sys->p_synchro,
 501                             I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 502                 vout_SynchroDecode( p_sys->p_synchro );
 503                 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 504             }
 505             break;
 506         }
 507
 508         default:
 509             break;
 510         }
 511     }
 512
 513     block_Release( p_block );
 514     return VLC_EGENERIC;
 515 }
 516
 517 /*****************************************************************************
 518  * EndDecoder: libmpeg2 decoder destruction
 519  *****************************************************************************/
 520 static int EndDecoder( decoder_t * p_dec )
 521 {
 522     decoder_sys_t *p_sys = p_dec->p_sys;
 523
 524     if( p_sys )
 525     {
 526         int i_pic;
 527
 528         if( p_sys->p_synchro )
 529             vout_SynchroRelease( p_sys->p_synchro );
 530
 531         if( p_sys->p_vout )
 532         {
 533             /* Temporary hack to free the pictures in use by libmpeg2 */
 534             for( i_pic = 0; i_pic < p_sys->p_vout->render.i_pictures; i_pic++ )
 535             {
 536                 if( p_sys->p_vout->render.pp_picture[i_pic]->i_status ==
 537                       RESERVED_PICTURE )
 538                     vout_DestroyPicture( p_sys->p_vout,
 539                                      p_sys->p_vout->render.pp_picture[i_pic] );
 540                 if( p_sys->p_vout->render.pp_picture[i_pic]->i_refcount > 0 )
 541                     vout_UnlinkPicture( p_sys->p_vout,
 542                                      p_sys->p_vout->render.pp_picture[i_pic] );
 543             }
 544
 545             vout_Request( p_dec, p_sys->p_vout, 0, 0, 0, 0 );
 546         }
 547
 548         if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 549
 550         free( p_sys );
 551     }
 552
 553     return VLC_SUCCESS;
 554 }
 555
 556 /*****************************************************************************
 557  * GetNewPicture: Get a new picture from the vout and set the buf struct
 558  *****************************************************************************/
 559 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
 560 {
 561     decoder_sys_t *p_sys = p_dec->p_sys;
 562
 563     picture_t *p_pic;
 564     vlc_bool_t b_progressive = p_sys->p_info->current_picture != NULL ?
 565         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME :
 566         1;
 567     vlc_bool_t b_top_field_first = p_sys->p_info->current_picture != NULL ?
 568         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST :
 569         1;
 570     unsigned int i_nb_fields = p_sys->p_info->current_picture != NULL ?
 571         p_sys->p_info->current_picture->nb_fields : 2;
 572
 573     /* Get a new picture */
 574     while( !(p_pic = vout_CreatePicture( p_sys->p_vout,
 575         b_progressive, b_top_field_first, i_nb_fields )) )
 576     {
 577         if( p_dec->p_fifo->b_die || p_dec->p_fifo->b_error )
 578             break;
 579
 580         msleep( VOUT_OUTMEM_SLEEP );
 581     }
 582     if( p_pic == NULL )
 583         return NULL;
 584     vout_LinkPicture( p_sys->p_vout, p_pic );
 585
 586     pp_buf[0] = p_pic->p[0].p_pixels;
 587     pp_buf[1] = p_pic->p[1].p_pixels;
 588     pp_buf[2] = p_pic->p[2].p_pixels;
 589
 590     return p_pic;
 591 }