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 1.21 2003/06/10 11:12:38 massiot Exp $
   6  *
   7  * Authors: Gildas Bazin <gbazin@netcourrier.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <vlc/vlc.h>
  28 #include <vlc/vout.h>
  29 #include <vlc/input.h>
  30 #include <vlc/decoder.h>
  31
  32 #include <stdlib.h>                                      /* malloc(), free() */
  33 #include <string.h>                                    /* memcpy(), memset() */
  34
  35 #include <mpeg2dec/mpeg2.h>
  36
  37 #include "vout_synchro.h"
  38
  39 /* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */
  40 #define AR_SQUARE_PICTURE       1                           /* square pixels */
  41 #define AR_3_4_PICTURE          2                        /* 3:4 picture (TV) */
  42 #define AR_16_9_PICTURE         3              /* 16:9 picture (wide screen) */
  43 #define AR_221_1_PICTURE        4                  /* 2.21:1 picture (movie) */
  44
  45 /*****************************************************************************
  46  * dec_thread_t : libmpeg2 decoder thread descriptor
  47  *****************************************************************************/
  48 typedef struct dec_thread_t
  49 {
  50     /*
  51      * libmpeg2 properties
  52      */
  53     mpeg2dec_t          *p_mpeg2dec;
  54     const mpeg2_info_t  *p_info;
  55     vlc_bool_t          b_skip;
  56
  57     /*
  58      * Input properties
  59      */
  60     decoder_fifo_t   *p_fifo;                  /* stores the PES stream data */
  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 } dec_thread_t;
  80
  81 /*****************************************************************************
  82  * Local prototypes
  83  *****************************************************************************/
  84 static int  OpenDecoder  ( vlc_object_t * );
  85 static int  RunDecoder   ( decoder_fifo_t * );
  86 static void CloseDecoder ( dec_thread_t * );
  87
  88 static picture_t *GetNewPicture( dec_thread_t *, uint8_t ** );
  89
  90 /*****************************************************************************
  91  * Module descriptor
  92  *****************************************************************************/
  93 vlc_module_begin();
  94     set_description( _("MPEG I/II video decoder (using libmpeg2)") );
  95     set_capability( "decoder", 40 );
  96     set_callbacks( OpenDecoder, NULL );
  97     add_shortcut( "libmpeg2" );
  98 vlc_module_end();
  99
 100 /*****************************************************************************
 101  * OpenDecoder: probe the decoder and return score
 102  *****************************************************************************/
 103 static int OpenDecoder( vlc_object_t *p_this )
 104 {
 105     decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
 106
 107     if( p_fifo->i_fourcc != VLC_FOURCC('m','p','g','v') )
 108     {
 109         return VLC_EGENERIC;
 110     }
 111
 112     p_fifo->pf_run = RunDecoder;
 113     return VLC_SUCCESS;
 114 }
 115
 116 /*****************************************************************************
 117  * RunDecoder: the libmpeg2 decoder
 118  *****************************************************************************/
 119 static int RunDecoder( decoder_fifo_t *p_fifo )
 120 {
 121     dec_thread_t    *p_dec;
 122     data_packet_t   *p_data = NULL;
 123     mpeg2_state_t   state;
 124     picture_t       *p_pic;
 125     int             i_aspect, i_chroma;
 126
 127     /* Allocate the memory needed to store the thread's structure */
 128     if( (p_dec = (dec_thread_t *)malloc (sizeof(dec_thread_t)) )
 129         == NULL)
 130     {
 131         msg_Err( p_fifo, "out of memory" );
 132         goto error;
 133     }
 134
 135     /* Initialize the thread properties */
 136     memset( p_dec, 0, sizeof(dec_thread_t) );
 137     p_dec->p_fifo     = p_fifo;
 138     p_dec->p_pes      = NULL;
 139     p_dec->p_vout     = NULL;
 140     p_dec->p_mpeg2dec = NULL;
 141     p_dec->p_synchro  = NULL;
 142     p_dec->p_info     = NULL;
 143     p_dec->i_pts      = mdate() + DEFAULT_PTS_DELAY;
 144     p_dec->i_current_pts  = 0;
 145     p_dec->i_previous_pts = 0;
 146     p_dec->i_period_remainder = 0;
 147     p_dec->p_picture_to_destroy = NULL;
 148     p_dec->b_garbage_pic = 0;
 149     p_dec->b_slice_i  = 0;
 150     p_dec->b_skip     = 0;
 151
 152     /* Initialize decoder */
 153     p_dec->p_mpeg2dec = mpeg2_init();
 154     if( p_dec->p_mpeg2dec == NULL)
 155         goto error;
 156
 157     p_dec->p_info = mpeg2_info( p_dec->p_mpeg2dec );
 158
 159     /* libmpeg2 decoder thread's main loop */
 160     while( (!p_dec->p_fifo->b_die) && (!p_dec->p_fifo->b_error) )
 161     {
 162         state = mpeg2_parse( p_dec->p_mpeg2dec );
 163
 164         switch( state )
 165         {
 166         case STATE_BUFFER:
 167             /* Feed libmpeg2 a data packet at a time */
 168             if( p_data == NULL )
 169             {
 170                 /* Get the next PES */
 171                 if( p_dec->p_pes )
 172                     input_DeletePES( p_dec->p_fifo->p_packets_mgt,
 173                                      p_dec->p_pes );
 174
 175                 input_ExtractPES( p_dec->p_fifo, &p_dec->p_pes );
 176                 if( !p_dec->p_pes )
 177                 {
 178                     p_dec->p_fifo->b_error = 1;
 179                     break;
 180                 }
 181
 182                 if( p_dec->p_pes->b_discontinuity && p_dec->p_synchro )
 183                 {
 184                     vout_SynchroReset( p_dec->p_synchro );
 185                     if ( p_dec->p_info->current_fbuf != NULL
 186                           && p_dec->p_info->current_fbuf->id != NULL )
 187                     {
 188                         p_dec->b_garbage_pic = 1;
 189                         p_pic = p_dec->p_info->current_fbuf->id;
 190                     }
 191                     else
 192                     {
 193                         uint8_t *buf[3];
 194                         buf[0] = buf[1] = buf[2] = NULL;
 195                         if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 196                             break;
 197                         mpeg2_set_buf( p_dec->p_mpeg2dec, buf, p_pic );
 198                     }
 199                     p_dec->p_picture_to_destroy = p_pic;
 200
 201                     memset( p_pic->p[0].p_pixels, 0,
 202                             p_dec->p_info->sequence->width
 203                              * p_dec->p_info->sequence->height );
 204                     memset( p_pic->p[1].p_pixels, 0x80,
 205                             p_dec->p_info->sequence->width
 206                              * p_dec->p_info->sequence->height / 4 );
 207                     memset( p_pic->p[2].p_pixels, 0x80,
 208                             p_dec->p_info->sequence->width
 209                              * p_dec->p_info->sequence->height / 4 );
 210
 211                     if ( p_dec->b_slice_i )
 212                     {
 213                         vout_SynchroNewPicture( p_dec->p_synchro,
 214                             I_CODING_TYPE, 2, 0, 0, p_dec->i_current_rate );
 215                         vout_SynchroDecode( p_dec->p_synchro );
 216                         vout_SynchroEnd( p_dec->p_synchro, I_CODING_TYPE, 0 );
 217                     }
 218                 }
 219
 220                 if( p_dec->p_pes->i_pts )
 221                 {
 222                     mpeg2_pts( p_dec->p_mpeg2dec,
 223                                (uint32_t)p_dec->p_pes->i_pts );
 224                     p_dec->i_previous_pts = p_dec->i_current_pts;
 225                     p_dec->i_current_pts = p_dec->p_pes->i_pts;
 226                 }
 227
 228                 p_dec->i_current_rate = p_dec->p_pes->i_rate;
 229                 p_data = p_dec->p_pes->p_first;
 230             }
 231
 232             if( p_data != NULL )
 233             {
 234                 mpeg2_buffer( p_dec->p_mpeg2dec,
 235                               p_data->p_payload_start,
 236                               p_data->p_payload_end );
 237
 238                 p_data = p_data->p_next;
 239             }
 240             break;
 241
 242         case STATE_SEQUENCE:
 243         {
 244             /* Initialize video output */
 245             uint8_t *buf[3];
 246             buf[0] = buf[1] = buf[2] = NULL;
 247
 248             /* Check whether the input gives a particular aspect ratio */
 249             if( p_dec->p_fifo->p_demux_data
 250                 && ( *(int*)(p_dec->p_fifo->p_demux_data) & 0x7 ) )
 251             {
 252                 i_aspect = *(int*)(p_dec->p_fifo->p_demux_data);
 253                 switch( i_aspect )
 254                 {
 255                 case AR_3_4_PICTURE:
 256                     i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 257                     break;
 258                 case AR_16_9_PICTURE:
 259                     i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
 260                     break;
 261                 case AR_221_1_PICTURE:
 262                     i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
 263                     break;
 264                 case AR_SQUARE_PICTURE:
 265                 default:
 266                     i_aspect = VOUT_ASPECT_FACTOR *
 267                                    p_dec->p_info->sequence->width /
 268                                    p_dec->p_info->sequence->height;
 269                     break;
 270                 }
 271             }
 272             else
 273             {
 274                 /* Use the value provided in the MPEG sequence header */
 275                 i_aspect = ((uint64_t)p_dec->p_info->sequence->display_width) *
 276                     p_dec->p_info->sequence->pixel_width * VOUT_ASPECT_FACTOR /
 277                     p_dec->p_info->sequence->display_height /
 278                     p_dec->p_info->sequence->pixel_height;
 279             }
 280
 281             i_chroma = VLC_FOURCC('Y','V','1','2');
 282
 283             p_dec->p_vout = vout_Request( p_dec->p_fifo, p_dec->p_vout,
 284                                           p_dec->p_info->sequence->width,
 285                                           p_dec->p_info->sequence->height,
 286                                           i_chroma, i_aspect );
 287
 288             msg_Dbg( p_dec->p_fifo, "%dx%d, aspect %d, %u.%03u fps",
 289                      p_dec->p_info->sequence->width,
 290                      p_dec->p_info->sequence->height, i_aspect,
 291                      (u32)((u64)1001000000 * 27 / p_dec->p_info->sequence->frame_period / 1001),
 292                      (u32)((u64)1001000000 * 27 / p_dec->p_info->sequence->frame_period % 1001) );
 293
 294             mpeg2_custom_fbuf( p_dec->p_mpeg2dec, 1 );
 295
 296             /* Set the first 2 reference frames */
 297             mpeg2_set_buf( p_dec->p_mpeg2dec, buf, NULL );
 298
 299             if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break;
 300             memset( p_pic->p[0].p_pixels, 0,
 301                     p_dec->p_info->sequence->width
 302                      * p_dec->p_info->sequence->height );
 303             memset( p_pic->p[1].p_pixels, 0x80,
 304                     p_dec->p_info->sequence->width
 305                      * p_dec->p_info->sequence->height / 4 );
 306             memset( p_pic->p[2].p_pixels, 0x80,
 307                     p_dec->p_info->sequence->width
 308                      * p_dec->p_info->sequence->height / 4 );
 309             mpeg2_set_buf( p_dec->p_mpeg2dec, buf, p_pic );
 310             /* This picture will never go through display_picture. */
 311             vout_DatePicture( p_dec->p_vout, p_pic, 0 );
 312             vout_DisplayPicture( p_dec->p_vout, p_pic );
 313             /* For some reason, libmpeg2 will put this pic twice in
 314              * discard_picture. This can be considered a bug in libmpeg2. */
 315             vout_LinkPicture( p_dec->p_vout, p_pic );
 316
 317             if ( p_dec->p_synchro )
 318             {
 319                 vout_SynchroRelease( p_dec->p_synchro );
 320             }
 321             p_dec->p_synchro = vout_SynchroInit( p_dec->p_fifo, p_dec->p_vout,
 322                 (u32)((u64)1001000000 * 27 / p_dec->p_info->sequence->frame_period) );
 323             p_dec->b_after_sequence_header = 1;
 324         }
 325         break;
 326
 327         case STATE_PICTURE_2ND:
 328             vout_SynchroNewPicture( p_dec->p_synchro,
 329                 p_dec->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 330                 p_dec->p_info->current_picture->nb_fields,
 331                 0, 0,
 332                 p_dec->i_current_rate );
 333
 334             if ( p_dec->b_skip )
 335             {
 336                 vout_SynchroTrash( p_dec->p_synchro );
 337             }
 338             else
 339             {
 340                 vout_SynchroDecode( p_dec->p_synchro );
 341             }
 342             break;
 343
 344         case STATE_PICTURE:
 345         {
 346             uint8_t *buf[3];
 347             buf[0] = buf[1] = buf[2] = NULL;
 348
 349             if ( p_dec->b_after_sequence_header
 350                   && ((p_dec->p_info->current_picture->flags
 351                         & PIC_MASK_CODING_TYPE)
 352                        == PIC_FLAG_CODING_TYPE_P) )
 353             {
 354                 /* Intra-slice refresh. Simulate a blank I picture. */
 355                 msg_Dbg( p_dec->p_fifo, "intra-slice refresh stream" );
 356                 vout_SynchroNewPicture( p_dec->p_synchro,
 357                     I_CODING_TYPE, 2, 0, 0, p_dec->i_current_rate );
 358                 vout_SynchroDecode( p_dec->p_synchro );
 359                 vout_SynchroEnd( p_dec->p_synchro, I_CODING_TYPE, 0 );
 360                 p_dec->b_slice_i = 1;
 361             }
 362             p_dec->b_after_sequence_header = 0;
 363
 364             vout_SynchroNewPicture( p_dec->p_synchro,
 365                 p_dec->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 366                 p_dec->p_info->current_picture->nb_fields,
 367                 (p_dec->p_info->current_picture->flags & PIC_FLAG_PTS) ?
 368                     ( (p_dec->p_info->current_picture->pts ==
 369                                 (uint32_t)p_dec->i_current_pts) ?
 370                               p_dec->i_current_pts : p_dec->i_previous_pts ) : 0,
 371                 0,
 372                 p_dec->i_current_rate );
 373
 374             if ( !(p_dec->b_slice_i
 375                    && ((p_dec->p_info->current_picture->flags
 376                          & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
 377                    && !vout_SynchroChoose( p_dec->p_synchro,
 378                               p_dec->p_info->current_picture->flags
 379                                 & PIC_MASK_CODING_TYPE ) )
 380             {
 381                 mpeg2_skip( p_dec->p_mpeg2dec, 1 );
 382                 p_dec->b_skip = 1;
 383                 vout_SynchroTrash( p_dec->p_synchro );
 384                 mpeg2_set_buf( p_dec->p_mpeg2dec, buf, NULL );
 385             }
 386             else
 387             {
 388                 mpeg2_skip( p_dec->p_mpeg2dec, 0 );
 389                 p_dec->b_skip = 0;
 390                 vout_SynchroDecode( p_dec->p_synchro );
 391                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL ) break;
 392                 mpeg2_set_buf( p_dec->p_mpeg2dec, buf, p_pic );
 393             }
 394         }
 395         break;
 396
 397         case STATE_END:
 398         case STATE_SLICE:
 399             if( p_dec->p_info->display_fbuf
 400                 && p_dec->p_info->display_fbuf->id )
 401             {
 402                 p_pic = (picture_t *)p_dec->p_info->display_fbuf->id;
 403
 404                 vout_SynchroEnd( p_dec->p_synchro,
 405                             p_dec->p_info->display_picture->flags
 406                              & PIC_MASK_CODING_TYPE,
 407                             p_dec->b_garbage_pic );
 408                 p_dec->b_garbage_pic = 0;
 409                 vout_DisplayPicture( p_dec->p_vout, p_pic );
 410
 411                 if ( p_dec->p_picture_to_destroy != p_pic )
 412                 {
 413                     vout_DatePicture( p_dec->p_vout, p_pic,
 414                         vout_SynchroDate( p_dec->p_synchro ) );
 415                 }
 416                 else
 417                 {
 418                     p_dec->p_picture_to_destroy = NULL;
 419                     vout_DatePicture( p_dec->p_vout, p_pic, 0 );
 420                 }
 421             }
 422
 423             if( p_dec->p_info->discard_fbuf &&
 424                 p_dec->p_info->discard_fbuf->id )
 425             {
 426                 p_pic = (picture_t *)p_dec->p_info->discard_fbuf->id;
 427                 vout_UnlinkPicture( p_dec->p_vout, p_pic );
 428             }
 429             break;
 430
 431         case STATE_INVALID:
 432         {
 433             uint8_t *buf[3];
 434             buf[0] = buf[1] = buf[2] = NULL;
 435
 436             msg_Warn( p_dec->p_fifo, "invalid picture encountered" );
 437             if ( ( p_dec->p_info->current_picture == NULL ) ||
 438                ( ( p_dec->p_info->current_picture->flags & PIC_MASK_CODING_TYPE)
 439                   != B_CODING_TYPE ) )
 440             {
 441                 vout_SynchroReset( p_dec->p_synchro );
 442             }
 443             mpeg2_skip( p_dec->p_mpeg2dec, 1 );
 444             p_dec->b_skip = 1;
 445
 446             if( p_dec->p_info->current_fbuf &&
 447                 p_dec->p_info->current_fbuf->id )
 448             {
 449                 p_dec->b_garbage_pic = 1;
 450                 p_pic = p_dec->p_info->current_fbuf->id;
 451             }
 452             else
 453             {
 454                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 455                     break;
 456                 mpeg2_set_buf( p_dec->p_mpeg2dec, buf, p_pic );
 457             }
 458             p_dec->p_picture_to_destroy = p_pic;
 459
 460             memset( p_pic->p[0].p_pixels, 0,
 461                     p_dec->p_info->sequence->width
 462                      * p_dec->p_info->sequence->height );
 463             memset( p_pic->p[1].p_pixels, 0x80,
 464                     p_dec->p_info->sequence->width
 465                      * p_dec->p_info->sequence->height / 4 );
 466             memset( p_pic->p[2].p_pixels, 0x80,
 467                     p_dec->p_info->sequence->width
 468                      * p_dec->p_info->sequence->height / 4 );
 469
 470             if ( p_dec->b_slice_i )
 471             {
 472                 vout_SynchroNewPicture( p_dec->p_synchro,
 473                             I_CODING_TYPE, 2, 0, 0, p_dec->i_current_rate );
 474                 vout_SynchroDecode( p_dec->p_synchro );
 475                 vout_SynchroEnd( p_dec->p_synchro, I_CODING_TYPE, 0 );
 476             }
 477             break;
 478         }
 479
 480         default:
 481             break;
 482         }
 483     }
 484
 485     /* If b_error is set, the libmpeg2 decoder thread enters the error loop */
 486     if( p_dec->p_fifo->b_error )
 487     {
 488         DecoderError( p_dec->p_fifo );
 489     }
 490
 491     /* End of the libmpeg2 decoder thread */
 492     CloseDecoder( p_dec );
 493
 494     return 0;
 495
 496  error:
 497     DecoderError( p_fifo );
 498     if( p_dec )
 499     {
 500         if( p_dec->p_fifo )
 501             p_dec->p_fifo->b_error = 1;
 502
 503         /* End of the libmpeg2 decoder thread */
 504         CloseDecoder( p_dec );
 505     }
 506
 507     return -1;
 508 }
 509
 510 /*****************************************************************************
 511  * CloseDecoder: libmpeg2 decoder destruction
 512  *****************************************************************************/
 513 static void CloseDecoder( dec_thread_t * p_dec )
 514 {
 515     if( p_dec )
 516     {
 517         int i_pic;
 518
 519         if( p_dec->p_pes )
 520             input_DeletePES( p_dec->p_fifo->p_packets_mgt, p_dec->p_pes );
 521
 522         if( p_dec->p_synchro )
 523             vout_SynchroRelease( p_dec->p_synchro );
 524
 525         if( p_dec->p_vout )
 526         {
 527             /* Temporary hack to free the pictures in use by libmpeg2 */
 528             for( i_pic = 0; i_pic < p_dec->p_vout->render.i_pictures; i_pic++ )
 529             {
 530                 if( p_dec->p_vout->render.pp_picture[i_pic]->i_status ==
 531                       RESERVED_PICTURE )
 532                     vout_DestroyPicture( p_dec->p_vout,
 533                                      p_dec->p_vout->render.pp_picture[i_pic] );
 534                 if( p_dec->p_vout->render.pp_picture[i_pic]->i_refcount > 0 )
 535                     vout_UnlinkPicture( p_dec->p_vout,
 536                                      p_dec->p_vout->render.pp_picture[i_pic] );
 537             }
 538
 539             vout_Request( p_dec->p_fifo, p_dec->p_vout, 0, 0, 0, 0 );
 540         }
 541
 542         if( p_dec->p_mpeg2dec ) mpeg2_close( p_dec->p_mpeg2dec );
 543
 544         free( p_dec );
 545     }
 546 }
 547
 548 /*****************************************************************************
 549  * GetNewPicture: Get a new picture from the vout and set the buf struct
 550  *****************************************************************************/
 551 static picture_t *GetNewPicture( dec_thread_t *p_dec, uint8_t **pp_buf )
 552 {
 553     picture_t *p_pic;
 554     vlc_bool_t b_progressive = p_dec->p_info->current_picture != NULL ?
 555         p_dec->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME :
 556         1;
 557     vlc_bool_t b_top_field_first = p_dec->p_info->current_picture != NULL ?
 558         p_dec->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST :
 559         1;
 560     unsigned int i_nb_fields = p_dec->p_info->current_picture != NULL ?
 561         p_dec->p_info->current_picture->nb_fields : 2;
 562
 563     /* Get a new picture */
 564     while( !(p_pic = vout_CreatePicture( p_dec->p_vout,
 565         b_progressive, b_top_field_first, i_nb_fields )) )
 566     {
 567         if( p_dec->p_fifo->b_die || p_dec->p_fifo->b_error )
 568             break;
 569
 570         msleep( VOUT_OUTMEM_SLEEP );
 571     }
 572     if( p_pic == NULL )
 573         return NULL;
 574     vout_LinkPicture( p_dec->p_vout, p_pic );
 575
 576     pp_buf[0] = p_pic->p[0].p_pixels;
 577     pp_buf[1] = p_pic->p[1].p_pixels;
 578     pp_buf[2] = p_pic->p[2].p_pixels;
 579
 580     return p_pic;
 581 }