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 1.28 2003/09/30 20:23:03 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         if( p_dec->p_fifo->b_die || p_dec->p_fifo->b_error )
 180         {
 181             block_Release( p_block );
 182             return VLC_EGENERIC;
 183         }
 184
 185         state = mpeg2_parse( p_sys->p_mpeg2dec );
 186
 187         switch( state )
 188         {
 189         case STATE_BUFFER:
 190             if( !p_block->i_buffer || b_need_more_data )
 191             {
 192                 block_Release( p_block );
 193                 return VLC_SUCCESS;
 194             }
 195
 196             if( p_block->b_discontinuity && p_sys->p_synchro
 197                 && p_sys->p_info->sequence->width != (unsigned)-1 )
 198             {
 199                 vout_SynchroReset( p_sys->p_synchro );
 200                 if( p_sys->p_info->current_fbuf != NULL
 201                     && p_sys->p_info->current_fbuf->id != NULL )
 202                 {
 203                     p_sys->b_garbage_pic = 1;
 204                     p_pic = p_sys->p_info->current_fbuf->id;
 205                 }
 206                 else
 207                 {
 208                     uint8_t *buf[3];
 209                     buf[0] = buf[1] = buf[2] = NULL;
 210                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 211                         break;
 212                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 213                 }
 214                 p_sys->p_picture_to_destroy = p_pic;
 215
 216                 memset( p_pic->p[0].p_pixels, 0,
 217                         p_sys->p_info->sequence->width
 218                          * p_sys->p_info->sequence->height );
 219                 memset( p_pic->p[1].p_pixels, 0x80,
 220                         p_sys->p_info->sequence->width
 221                          * p_sys->p_info->sequence->height / 4 );
 222                 memset( p_pic->p[2].p_pixels, 0x80,
 223                         p_sys->p_info->sequence->width
 224                          * p_sys->p_info->sequence->height / 4 );
 225
 226                 if ( p_sys->b_slice_i )
 227                 {
 228                     vout_SynchroNewPicture( p_sys->p_synchro,
 229                         I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 230                     vout_SynchroDecode( p_sys->p_synchro );
 231                     vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 232                 }
 233             }
 234
 235             if( p_block->i_pts )
 236             {
 237                 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 238                 p_sys->i_previous_pts = p_sys->i_current_pts;
 239                 p_sys->i_current_pts = p_block->i_pts;
 240             }
 241
 242             p_sys->i_current_rate = DEFAULT_RATE;//p_pes->i_rate;
 243
 244             mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 245                           p_block->p_buffer + p_block->i_buffer );
 246
 247             b_need_more_data = VLC_TRUE;
 248             break;
 249
 250         case STATE_SEQUENCE:
 251         {
 252             /* Initialize video output */
 253             uint8_t *buf[3];
 254             buf[0] = buf[1] = buf[2] = NULL;
 255
 256             /* Check whether the input gives a particular aspect ratio */
 257             if( p_dec->p_fifo->p_demux_data
 258                 && ( *(int*)(p_dec->p_fifo->p_demux_data) & 0x7 ) )
 259             {
 260                 i_aspect = *(int*)(p_dec->p_fifo->p_demux_data);
 261                 switch( i_aspect )
 262                 {
 263                 case AR_3_4_PICTURE:
 264                     i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 265                     break;
 266                 case AR_16_9_PICTURE:
 267                     i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
 268                     break;
 269                 case AR_221_1_PICTURE:
 270                     i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
 271                     break;
 272                 case AR_SQUARE_PICTURE:
 273                 default:
 274                     i_aspect = VOUT_ASPECT_FACTOR *
 275                                    p_sys->p_info->sequence->width /
 276                                    p_sys->p_info->sequence->height;
 277                     break;
 278                 }
 279             }
 280             else
 281             {
 282                 /* Use the value provided in the MPEG sequence header */
 283                 i_aspect = ((uint64_t)p_sys->p_info->sequence->display_width) *
 284                     p_sys->p_info->sequence->pixel_width * VOUT_ASPECT_FACTOR /
 285                     p_sys->p_info->sequence->display_height /
 286                     p_sys->p_info->sequence->pixel_height;
 287             }
 288
 289             if ( p_dec->p_sys->p_vout != NULL )
 290             {
 291               int i_pic;
 292                 /* Temporary hack to free the pictures in use by libmpeg2 */
 293                 for ( i_pic = 0; i_pic < p_dec->p_sys->p_vout->render.i_pictures; i_pic++ )
 294                 {
 295                     if( p_dec->p_sys->p_vout->render.pp_picture[i_pic]->i_status ==
 296                           RESERVED_PICTURE )
 297                         vout_DestroyPicture( p_dec->p_sys->p_vout,
 298                                          p_dec->p_sys->p_vout->render.pp_picture[i_pic] );
 299                     if( p_dec->p_sys->p_vout->render.pp_picture[i_pic]->i_refcount > 0 )
 300                         vout_UnlinkPicture( p_dec->p_sys->p_vout,
 301                                          p_dec->p_sys->p_vout->render.pp_picture[i_pic] );
 302                 }
 303             }
 304
 305             p_sys->p_vout = vout_Request( p_dec, p_sys->p_vout,
 306                                           p_sys->p_info->sequence->width,
 307                                           p_sys->p_info->sequence->height,
 308                                           VLC_FOURCC('Y','V','1','2'),
 309                                           i_aspect );
 310
 311             if(p_sys->p_vout == NULL )
 312             {
 313                 msg_Err( p_dec, "cannot create vout" );
 314                 block_Release( p_block );
 315                 return -1;
 316             }
 317
 318             msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
 319                      p_sys->p_info->sequence->width,
 320                      p_sys->p_info->sequence->height, i_aspect,
 321                      (uint32_t)((u64)1001000000 * 27 /
 322                      p_sys->p_info->sequence->frame_period / 1001),
 323                      (uint32_t)((u64)1001000000 * 27 /
 324                      p_sys->p_info->sequence->frame_period % 1001) );
 325
 326             mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 327
 328             /* Set the first 2 reference frames */
 329             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 330
 331             if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break;
 332             memset( p_pic->p[0].p_pixels, 0,
 333                     p_sys->p_info->sequence->width
 334                      * p_sys->p_info->sequence->height );
 335             memset( p_pic->p[1].p_pixels, 0x80,
 336                     p_sys->p_info->sequence->width
 337                      * p_sys->p_info->sequence->height / 4 );
 338             memset( p_pic->p[2].p_pixels, 0x80,
 339                     p_sys->p_info->sequence->width
 340                      * p_sys->p_info->sequence->height / 4 );
 341             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 342             /* This picture will never go through display_picture. */
 343             vout_DatePicture( p_sys->p_vout, p_pic, 0 );
 344             vout_DisplayPicture( p_sys->p_vout, p_pic );
 345             /* For some reason, libmpeg2 will put this pic twice in
 346              * discard_picture. This can be considered a bug in libmpeg2. */
 347             vout_LinkPicture( p_sys->p_vout, p_pic );
 348
 349             if ( p_sys->p_synchro )
 350             {
 351                 vout_SynchroRelease( p_sys->p_synchro );
 352             }
 353             p_sys->p_synchro = vout_SynchroInit( p_dec, p_sys->p_vout,
 354                 (uint32_t)((uint64_t)1001000000 * 27 /
 355                 p_sys->p_info->sequence->frame_period) );
 356             p_sys->b_after_sequence_header = 1;
 357         }
 358         break;
 359
 360         case STATE_PICTURE_2ND:
 361             vout_SynchroNewPicture( p_sys->p_synchro,
 362                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 363                 p_sys->p_info->current_picture->nb_fields,
 364                 0, 0,
 365                 p_sys->i_current_rate );
 366
 367             if ( p_sys->b_skip )
 368             {
 369                 vout_SynchroTrash( p_sys->p_synchro );
 370             }
 371             else
 372             {
 373                 vout_SynchroDecode( p_sys->p_synchro );
 374             }
 375             break;
 376
 377         case STATE_PICTURE:
 378         {
 379             uint8_t *buf[3];
 380             buf[0] = buf[1] = buf[2] = NULL;
 381
 382             if ( p_sys->b_after_sequence_header
 383                   && ((p_sys->p_info->current_picture->flags
 384                         & PIC_MASK_CODING_TYPE)
 385                        == PIC_FLAG_CODING_TYPE_P) )
 386             {
 387                 /* Intra-slice refresh. Simulate a blank I picture. */
 388                 msg_Dbg( p_dec, "intra-slice refresh stream" );
 389                 vout_SynchroNewPicture( p_sys->p_synchro,
 390                     I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 391                 vout_SynchroDecode( p_sys->p_synchro );
 392                 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 393                 p_sys->b_slice_i = 1;
 394             }
 395             p_sys->b_after_sequence_header = 0;
 396
 397             vout_SynchroNewPicture( p_sys->p_synchro,
 398                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 399                 p_sys->p_info->current_picture->nb_fields,
 400                 (p_sys->p_info->current_picture->flags & PIC_FLAG_PTS) ?
 401                     ( ( p_sys->p_info->current_picture->pts ==
 402                         (uint32_t)p_sys->i_current_pts ) ?
 403                       p_sys->i_current_pts : p_sys->i_previous_pts ) : 0,
 404                 0, p_sys->i_current_rate );
 405
 406             if ( !(p_sys->b_slice_i
 407                    && ((p_sys->p_info->current_picture->flags
 408                          & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
 409                    && !vout_SynchroChoose( p_sys->p_synchro,
 410                               p_sys->p_info->current_picture->flags
 411                                 & PIC_MASK_CODING_TYPE ) )
 412             {
 413                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 414                 p_sys->b_skip = 1;
 415                 vout_SynchroTrash( p_sys->p_synchro );
 416                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 417             }
 418             else
 419             {
 420                 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
 421                 p_sys->b_skip = 0;
 422                 vout_SynchroDecode( p_sys->p_synchro );
 423                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break;
 424                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 425             }
 426         }
 427         break;
 428
 429         case STATE_END:
 430         case STATE_SLICE:
 431             if( p_sys->p_info->display_fbuf
 432                 && p_sys->p_info->display_fbuf->id )
 433             {
 434                 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
 435
 436                 vout_SynchroEnd( p_sys->p_synchro,
 437                             p_sys->p_info->display_picture->flags
 438                              & PIC_MASK_CODING_TYPE,
 439                             p_sys->b_garbage_pic );
 440                 p_sys->b_garbage_pic = 0;
 441                 vout_DisplayPicture( p_sys->p_vout, p_pic );
 442
 443                 if ( p_sys->p_picture_to_destroy != p_pic )
 444                 {
 445                     vout_DatePicture( p_sys->p_vout, p_pic,
 446                         vout_SynchroDate( p_sys->p_synchro ) );
 447                 }
 448                 else
 449                 {
 450                     p_sys->p_picture_to_destroy = NULL;
 451                     vout_DatePicture( p_sys->p_vout, p_pic, 0 );
 452                 }
 453             }
 454
 455             if( p_sys->p_info->discard_fbuf &&
 456                 p_sys->p_info->discard_fbuf->id )
 457             {
 458                 p_pic = (picture_t *)p_sys->p_info->discard_fbuf->id;
 459                 vout_UnlinkPicture( p_sys->p_vout, p_pic );
 460             }
 461             break;
 462
 463         case STATE_INVALID:
 464         {
 465             uint8_t *buf[3];
 466             buf[0] = buf[1] = buf[2] = NULL;
 467
 468             msg_Warn( p_dec, "invalid picture encountered" );
 469             if ( ( p_sys->p_info->current_picture == NULL ) ||
 470                ( ( p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE)
 471                   != B_CODING_TYPE ) )
 472             {
 473                 vout_SynchroReset( p_sys->p_synchro );
 474             }
 475             mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 476             p_sys->b_skip = 1;
 477
 478             if( p_sys->p_info->current_fbuf &&
 479                 p_sys->p_info->current_fbuf->id )
 480             {
 481                 p_sys->b_garbage_pic = 1;
 482                 p_pic = p_sys->p_info->current_fbuf->id;
 483             }
 484             else
 485             {
 486                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 487                     break;
 488                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 489             }
 490             p_sys->p_picture_to_destroy = p_pic;
 491
 492             memset( p_pic->p[0].p_pixels, 0,
 493                     p_sys->p_info->sequence->width
 494                      * p_sys->p_info->sequence->height );
 495             memset( p_pic->p[1].p_pixels, 0x80,
 496                     p_sys->p_info->sequence->width
 497                      * p_sys->p_info->sequence->height / 4 );
 498             memset( p_pic->p[2].p_pixels, 0x80,
 499                     p_sys->p_info->sequence->width
 500                      * p_sys->p_info->sequence->height / 4 );
 501
 502             if ( p_sys->b_slice_i )
 503             {
 504                 vout_SynchroNewPicture( p_sys->p_synchro,
 505                             I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 506                 vout_SynchroDecode( p_sys->p_synchro );
 507                 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 508             }
 509             break;
 510         }
 511
 512         default:
 513             break;
 514         }
 515     }
 516
 517     block_Release( p_block );
 518     return VLC_EGENERIC;
 519 }
 520
 521 /*****************************************************************************
 522  * EndDecoder: libmpeg2 decoder destruction
 523  *****************************************************************************/
 524 static int EndDecoder( decoder_t * p_dec )
 525 {
 526     decoder_sys_t *p_sys = p_dec->p_sys;
 527
 528     if( p_sys )
 529     {
 530         int i_pic;
 531
 532         if( p_sys->p_synchro )
 533             vout_SynchroRelease( p_sys->p_synchro );
 534
 535         if( p_sys->p_vout )
 536         {
 537             /* Temporary hack to free the pictures in use by libmpeg2 */
 538             for( i_pic = 0; i_pic < p_sys->p_vout->render.i_pictures; i_pic++ )
 539             {
 540                 if( p_sys->p_vout->render.pp_picture[i_pic]->i_status ==
 541                       RESERVED_PICTURE )
 542                     vout_DestroyPicture( p_sys->p_vout,
 543                                      p_sys->p_vout->render.pp_picture[i_pic] );
 544                 if( p_sys->p_vout->render.pp_picture[i_pic]->i_refcount > 0 )
 545                     vout_UnlinkPicture( p_sys->p_vout,
 546                                      p_sys->p_vout->render.pp_picture[i_pic] );
 547             }
 548
 549             vout_Request( p_dec, p_sys->p_vout, 0, 0, 0, 0 );
 550         }
 551
 552         if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 553
 554         free( p_sys );
 555     }
 556
 557     return VLC_SUCCESS;
 558 }
 559
 560 /*****************************************************************************
 561  * GetNewPicture: Get a new picture from the vout and set the buf struct
 562  *****************************************************************************/
 563 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
 564 {
 565     decoder_sys_t *p_sys = p_dec->p_sys;
 566
 567     picture_t *p_pic;
 568     vlc_bool_t b_progressive = p_sys->p_info->current_picture != NULL ?
 569         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME :
 570         1;
 571     vlc_bool_t b_top_field_first = p_sys->p_info->current_picture != NULL ?
 572         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST :
 573         1;
 574     unsigned int i_nb_fields = p_sys->p_info->current_picture != NULL ?
 575         p_sys->p_info->current_picture->nb_fields : 2;
 576
 577     /* Get a new picture */
 578     while( !(p_pic = vout_CreatePicture( p_sys->p_vout,
 579         b_progressive, b_top_field_first, i_nb_fields )) )
 580     {
 581         if( p_dec->p_fifo->b_die || p_dec->p_fifo->b_error )
 582             break;
 583
 584         msleep( VOUT_OUTMEM_SLEEP );
 585     }
 586     if( p_pic == NULL )
 587         return NULL;
 588     vout_LinkPicture( p_sys->p_vout, p_pic );
 589
 590     pp_buf[0] = p_pic->p[0].p_pixels;
 591     pp_buf[1] = p_pic->p[1].p_pixels;
 592     pp_buf[2] = p_pic->p[2].p_pixels;
 593
 594     return p_pic;
 595 }