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  * $Id$
   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., 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/decoder.h>
  31
  32 #include <mpeg2dec/mpeg2.h>
  33
  34 #include "vout_synchro.h"
  35
  36 /* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */
  37 #define AR_SQUARE_PICTURE       1                           /* square pixels */
  38 #define AR_3_4_PICTURE          2                        /* 3:4 picture (TV) */
  39 #define AR_16_9_PICTURE         3              /* 16:9 picture (wide screen) */
  40 #define AR_221_1_PICTURE        4                  /* 2.21:1 picture (movie) */
  41
  42 /*****************************************************************************
  43  * decoder_sys_t : libmpeg2 decoder descriptor
  44  *****************************************************************************/
  45 struct decoder_sys_t
  46 {
  47     /*
  48      * libmpeg2 properties
  49      */
  50     mpeg2dec_t          *p_mpeg2dec;
  51     const mpeg2_info_t  *p_info;
  52     vlc_bool_t          b_skip;
  53
  54     /*
  55      * Input properties
  56      */
  57     mtime_t          i_previous_pts;
  58     mtime_t          i_current_pts;
  59     mtime_t          i_previous_dts;
  60     mtime_t          i_current_dts;
  61     int              i_current_rate;
  62     picture_t *      p_picture_to_destroy;
  63     vlc_bool_t       b_garbage_pic;
  64     vlc_bool_t       b_after_sequence_header; /* is it the next frame after
  65                                                * the sequence header ?    */
  66     vlc_bool_t       b_slice_i;             /* intra-slice refresh stream */
  67
  68     vlc_bool_t      b_preroll;
  69
  70     /*
  71      * Output properties
  72      */
  73     vout_synchro_t *p_synchro;
  74     int            i_aspect;
  75     mtime_t        i_last_frame_pts;
  76
  77 };
  78
  79 /*****************************************************************************
  80  * Local prototypes
  81  *****************************************************************************/
  82 static int  OpenDecoder( vlc_object_t * );
  83 static void CloseDecoder( vlc_object_t * );
  84
  85 static picture_t *DecodeBlock( decoder_t *, block_t ** );
  86
  87 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
  88
  89 /*****************************************************************************
  90  * Module descriptor
  91  *****************************************************************************/
  92 vlc_module_begin();
  93     set_description( _("MPEG I/II video decoder (using libmpeg2)") );
  94     set_capability( "decoder", 150 );
  95     set_category( CAT_INPUT );
  96     set_subcategory( SUBCAT_INPUT_VCODEC );
  97     set_callbacks( OpenDecoder, CloseDecoder );
  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     decoder_sys_t *p_sys;
 108     uint32_t i_accel = 0;
 109
 110     if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
 111         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
 112         /* Pinnacle hardware-mpeg1 */
 113         p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
 114         /* ATI Video */
 115         p_dec->fmt_in.i_codec != VLC_FOURCC('V','C','R','2') &&
 116         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') )
 117     {
 118         return VLC_EGENERIC;
 119     }
 120
 121     /* Allocate the memory needed to store the decoder's structure */
 122     if( ( p_dec->p_sys = p_sys =
 123           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
 124     {
 125         msg_Err( p_dec, "out of memory" );
 126         return VLC_EGENERIC;
 127     }
 128
 129     /* Initialize the thread properties */
 130     memset( p_sys, 0, sizeof(decoder_sys_t) );
 131     p_sys->p_mpeg2dec = NULL;
 132     p_sys->p_synchro  = NULL;
 133     p_sys->p_info     = NULL;
 134     p_sys->i_current_pts  = 0;
 135     p_sys->i_previous_pts = 0;
 136     p_sys->i_current_dts  = 0;
 137     p_sys->i_previous_dts = 0;
 138     p_sys->p_picture_to_destroy = NULL;
 139     p_sys->b_garbage_pic = 0;
 140     p_sys->b_slice_i  = 0;
 141     p_sys->b_skip     = 0;
 142     p_sys->b_preroll = VLC_FALSE;
 143
 144 #if defined( __i386__ ) || defined( __x86_64__ )
 145     if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMX )
 146     {
 147         i_accel |= MPEG2_ACCEL_X86_MMX;
 148     }
 149
 150     if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_3DNOW )
 151     {
 152         i_accel |= MPEG2_ACCEL_X86_3DNOW;
 153     }
 154
 155     if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMXEXT )
 156     {
 157         i_accel |= MPEG2_ACCEL_X86_MMXEXT;
 158     }
 159
 160 #elif defined( __powerpc__ ) || defined( SYS_DARWIN )
 161     if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_ALTIVEC )
 162     {
 163         i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
 164     }
 165
 166 #else
 167     /* If we do not know this CPU, trust libmpeg2's feature detection */
 168     i_accel = MPEG2_ACCEL_DETECT;
 169
 170 #endif
 171
 172     /* Set CPU acceleration features */
 173     mpeg2_accel( i_accel );
 174
 175     /* Initialize decoder */
 176     p_sys->p_mpeg2dec = mpeg2_init();
 177     if( p_sys->p_mpeg2dec == NULL)
 178     {
 179         msg_Err( p_dec, "mpeg2_init() failed" );
 180         free( p_sys );
 181         return VLC_EGENERIC;
 182     }
 183
 184     p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
 185
 186     p_dec->pf_decode_video = DecodeBlock;
 187
 188     return VLC_SUCCESS;
 189 }
 190
 191 /*****************************************************************************
 192  * RunDecoder: the libmpeg2 decoder
 193  *****************************************************************************/
 194 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 195 {
 196     decoder_sys_t   *p_sys = p_dec->p_sys;
 197     mpeg2_state_t   state;
 198     picture_t       *p_pic;
 199
 200     block_t *p_block;
 201
 202     if( !pp_block || !*pp_block ) return NULL;
 203
 204     p_block = *pp_block;
 205
 206     while( 1 )
 207     {
 208         state = mpeg2_parse( p_sys->p_mpeg2dec );
 209
 210         switch( state )
 211         {
 212         case STATE_BUFFER:
 213             if( !p_block->i_buffer )
 214             {
 215                 block_Release( p_block );
 216                 return NULL;
 217             }
 218
 219             if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
 220                                       | BLOCK_FLAG_CORRUPTED)) &&
 221                 p_sys->p_synchro &&
 222                 p_sys->p_info->sequence &&
 223                 p_sys->p_info->sequence->width != (unsigned)-1 )
 224             {
 225                 vout_SynchroReset( p_sys->p_synchro );
 226                 if( p_sys->p_info->current_fbuf != NULL
 227                     && p_sys->p_info->current_fbuf->id != NULL )
 228                 {
 229                     p_sys->b_garbage_pic = 1;
 230                     p_pic = p_sys->p_info->current_fbuf->id;
 231                 }
 232                 else
 233                 {
 234                     uint8_t *buf[3];
 235                     buf[0] = buf[1] = buf[2] = NULL;
 236                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 237                         break;
 238                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 239                 }
 240                 p_sys->p_picture_to_destroy = p_pic;
 241
 242                 if ( p_sys->b_slice_i )
 243                 {
 244                     vout_SynchroNewPicture( p_sys->p_synchro,
 245                         I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
 246                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 247                     vout_SynchroDecode( p_sys->p_synchro );
 248                     vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 249                 }
 250             }
 251
 252             if( p_block->i_flags & BLOCK_FLAG_PREROLL )
 253             {
 254                 p_sys->b_preroll = VLC_TRUE;
 255             }
 256             else if( p_sys->b_preroll )
 257             {
 258                 p_sys->b_preroll = VLC_FALSE;
 259                 /* Reset synchro */
 260                 vout_SynchroReset( p_sys->p_synchro );
 261             }
 262
 263 #ifdef PIC_FLAG_PTS
 264             if( p_block->i_pts )
 265             {
 266                 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 267
 268 #else /* New interface */
 269             if( p_block->i_pts || p_block->i_dts )
 270             {
 271                 mpeg2_tag_picture( p_sys->p_mpeg2dec,
 272                                    (uint32_t)p_block->i_pts,
 273                                    (uint32_t)p_block->i_dts );
 274 #endif
 275                 p_sys->i_previous_pts = p_sys->i_current_pts;
 276                 p_sys->i_current_pts = p_block->i_pts;
 277                 p_sys->i_previous_dts = p_sys->i_current_dts;
 278                 p_sys->i_current_dts = p_block->i_dts;
 279             }
 280
 281             p_sys->i_current_rate = p_block->i_rate;
 282
 283             mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 284                           p_block->p_buffer + p_block->i_buffer );
 285
 286             p_block->i_buffer = 0;
 287             break;
 288
 289         case STATE_SEQUENCE:
 290         {
 291             /* Initialize video output */
 292             uint8_t *buf[3];
 293             buf[0] = buf[1] = buf[2] = NULL;
 294
 295             /* Check whether the input gave a particular aspect ratio */
 296             if( p_dec->fmt_in.video.i_aspect )
 297             {
 298                 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
 299                 if( p_sys->i_aspect <= AR_221_1_PICTURE )
 300                 switch( p_sys->i_aspect )
 301                 {
 302                 case AR_3_4_PICTURE:
 303                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 304                     break;
 305                 case AR_16_9_PICTURE:
 306                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
 307                     break;
 308                 case AR_221_1_PICTURE:
 309                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
 310                     break;
 311                 case AR_SQUARE_PICTURE:
 312                     p_sys->i_aspect = VOUT_ASPECT_FACTOR *
 313                                    p_sys->p_info->sequence->width /
 314                                    p_sys->p_info->sequence->height;
 315                     break;
 316                 }
 317             }
 318             else
 319             {
 320                 /* Use the value provided in the MPEG sequence header */
 321                 if( p_sys->p_info->sequence->pixel_height > 0 )
 322                 {
 323                     p_sys->i_aspect =
 324                         ((uint64_t)p_sys->p_info->sequence->display_width) *
 325                         p_sys->p_info->sequence->pixel_width *
 326                         VOUT_ASPECT_FACTOR /
 327                         p_sys->p_info->sequence->display_height /
 328                         p_sys->p_info->sequence->pixel_height;
 329                 }
 330                 else
 331                 {
 332                     /* Invalid aspect, assume 4:3.
 333                      * This shouldn't happen and if it does it is a bug
 334                      * in libmpeg2 (likely triggered by an invalid stream) */
 335                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 336                 }
 337             }
 338
 339             msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
 340                      p_sys->p_info->sequence->width,
 341                      p_sys->p_info->sequence->height, p_sys->i_aspect,
 342                      (uint32_t)((uint64_t)1001000000 * 27 /
 343                          p_sys->p_info->sequence->frame_period / 1001),
 344                      (uint32_t)((uint64_t)1001000000 * 27 /
 345                          p_sys->p_info->sequence->frame_period % 1001) );
 346
 347             mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 348
 349             /* Set the first 2 reference frames */
 350             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 351
 352             if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 353             {
 354                 block_Release( p_block );
 355                 return NULL;
 356             }
 357
 358             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 359
 360             /* This picture will never go through display_picture. */
 361             p_pic->date = 0;
 362
 363             /* For some reason, libmpeg2 will put this pic twice in
 364              * discard_picture. This can be considered a bug in libmpeg2. */
 365             p_dec->pf_picture_link( p_dec, p_pic );
 366
 367             if( p_sys->p_synchro )
 368             {
 369                 vout_SynchroRelease( p_sys->p_synchro );
 370             }
 371             p_sys->p_synchro = vout_SynchroInit( p_dec,
 372                 (uint32_t)((uint64_t)1001000000 * 27 /
 373                 p_sys->p_info->sequence->frame_period) );
 374             p_sys->b_after_sequence_header = 1;
 375         }
 376         break;
 377
 378         case STATE_PICTURE_2ND:
 379             vout_SynchroNewPicture( p_sys->p_synchro,
 380                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 381                 p_sys->p_info->current_picture->nb_fields,
 382                 0, 0, p_sys->i_current_rate,
 383                 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 384
 385             if( p_sys->b_skip )
 386             {
 387                 vout_SynchroTrash( p_sys->p_synchro );
 388             }
 389             else
 390             {
 391                 vout_SynchroDecode( p_sys->p_synchro );
 392             }
 393             break;
 394
 395         case STATE_PICTURE:
 396         {
 397             uint8_t *buf[3];
 398             mtime_t i_pts, i_dts;
 399             buf[0] = buf[1] = buf[2] = NULL;
 400
 401             if ( p_sys->b_after_sequence_header &&
 402                  ((p_sys->p_info->current_picture->flags &
 403                        PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
 404             {
 405                 /* Intra-slice refresh. Simulate a blank I picture. */
 406                 msg_Dbg( p_dec, "intra-slice refresh stream" );
 407                 vout_SynchroNewPicture( p_sys->p_synchro,
 408                     I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
 409                     p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 410                 vout_SynchroDecode( p_sys->p_synchro );
 411                 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 412                 p_sys->b_slice_i = 1;
 413             }
 414             p_sys->b_after_sequence_header = 0;
 415
 416 #ifdef PIC_FLAG_PTS
 417             i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
 418                 ( ( p_sys->p_info->current_picture->pts ==
 419                     (uint32_t)p_sys->i_current_pts ) ?
 420                   p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 421             i_dts = 0;
 422
 423             /* Hack to handle demuxers which only have DTS timestamps */
 424             if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
 425             {
 426                 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
 427                     (p_sys->p_info->current_picture->flags &
 428                       PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 429                 {
 430                     i_pts = p_block->i_dts;
 431                 }
 432             }
 433             p_block->i_pts = p_block->i_dts = 0;
 434             /* End hack */
 435
 436 #else /* New interface */
 437
 438             i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
 439                 ( ( p_sys->p_info->current_picture->tag ==
 440                     (uint32_t)p_sys->i_current_pts ) ?
 441                   p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 442             i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
 443                 ( ( p_sys->p_info->current_picture->tag2 ==
 444                     (uint32_t)p_sys->i_current_dts ) ?
 445                   p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
 446 #endif
 447
 448             vout_SynchroNewPicture( p_sys->p_synchro,
 449                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 450                 p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
 451                 p_sys->i_current_rate,
 452                 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 453
 454             if( !p_dec->b_pace_control && !p_sys->b_preroll &&
 455                 !(p_sys->b_slice_i
 456                    && ((p_sys->p_info->current_picture->flags
 457                          & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
 458                    && !vout_SynchroChoose( p_sys->p_synchro,
 459                               p_sys->p_info->current_picture->flags
 460                                 & PIC_MASK_CODING_TYPE,
 461                               /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
 462                               p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
 463             {
 464                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 465                 p_sys->b_skip = 1;
 466                 vout_SynchroTrash( p_sys->p_synchro );
 467                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 468             }
 469             else
 470             {
 471                 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
 472                 p_sys->b_skip = 0;
 473                 vout_SynchroDecode( p_sys->p_synchro );
 474
 475                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 476                 {
 477                     block_Release( p_block );
 478                     return NULL;
 479                 }
 480
 481                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 482             }
 483         }
 484         break;
 485
 486         case STATE_END:
 487         case STATE_SLICE:
 488             p_pic = NULL;
 489             if( p_sys->p_info->display_fbuf
 490                 && p_sys->p_info->display_fbuf->id )
 491             {
 492                 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
 493
 494                 vout_SynchroEnd( p_sys->p_synchro,
 495                             p_sys->p_info->display_picture->flags
 496                              & PIC_MASK_CODING_TYPE,
 497                             p_sys->b_garbage_pic );
 498                 p_sys->b_garbage_pic = 0;
 499
 500                 if ( p_sys->p_picture_to_destroy != p_pic )
 501                 {
 502                     p_pic->date = vout_SynchroDate( p_sys->p_synchro );
 503                 }
 504                 else
 505                 {
 506                     p_sys->p_picture_to_destroy = NULL;
 507                     p_pic->date = 0;
 508                 }
 509             }
 510
 511             if( p_sys->p_info->discard_fbuf &&
 512                 p_sys->p_info->discard_fbuf->id )
 513             {
 514                 p_dec->pf_picture_unlink( p_dec,
 515                                           p_sys->p_info->discard_fbuf->id );
 516             }
 517
 518             /* For still frames */
 519             if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;
 520
 521             if( p_pic )
 522             {
 523                 /* Avoid frames with identical timestamps.
 524                  * Especially needed for still frames in DVD menus. */
 525                 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
 526                 p_sys->i_last_frame_pts = p_pic->date;
 527
 528                 return p_pic;
 529             }
 530
 531             break;
 532
 533         case STATE_INVALID:
 534         {
 535             uint8_t *buf[3];
 536             buf[0] = buf[1] = buf[2] = NULL;
 537
 538             msg_Warn( p_dec, "invalid picture encountered" );
 539             if ( ( p_sys->p_info->current_picture == NULL ) ||
 540                ( ( p_sys->p_info->current_picture->flags &
 541                    PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
 542             {
 543                 if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
 544             }
 545             mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 546             p_sys->b_skip = 1;
 547
 548             if( p_sys->p_info->current_fbuf &&
 549                 p_sys->p_info->current_fbuf->id )
 550             {
 551                 p_sys->b_garbage_pic = 1;
 552                 p_pic = p_sys->p_info->current_fbuf->id;
 553             }
 554             else if( !p_sys->p_info->sequence )
 555             {
 556                 break;
 557             }
 558             else
 559             {
 560                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 561                     break;
 562                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 563             }
 564             p_sys->p_picture_to_destroy = p_pic;
 565
 566             memset( p_pic->p[0].p_pixels, 0,
 567                     p_sys->p_info->sequence->width
 568                      * p_sys->p_info->sequence->height );
 569             memset( p_pic->p[1].p_pixels, 0x80,
 570                     p_sys->p_info->sequence->width
 571                      * p_sys->p_info->sequence->height / 4 );
 572             memset( p_pic->p[2].p_pixels, 0x80,
 573                     p_sys->p_info->sequence->width
 574                      * p_sys->p_info->sequence->height / 4 );
 575
 576             if( p_sys->b_slice_i )
 577             {
 578                 vout_SynchroNewPicture( p_sys->p_synchro,
 579                         I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
 580                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 581                 vout_SynchroDecode( p_sys->p_synchro );
 582                 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 583             }
 584             break;
 585         }
 586
 587         default:
 588             break;
 589         }
 590     }
 591
 592     /* Never reached */
 593     return NULL;
 594 }
 595
 596 /*****************************************************************************
 597  * CloseDecoder: libmpeg2 decoder destruction
 598  *****************************************************************************/
 599 static void CloseDecoder( vlc_object_t *p_this )
 600 {
 601     decoder_t *p_dec = (decoder_t *)p_this;
 602     decoder_sys_t *p_sys = p_dec->p_sys;
 603
 604     if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
 605
 606     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 607
 608     free( p_sys );
 609 }
 610
 611 /*****************************************************************************
 612  * GetNewPicture: Get a new picture from the vout and set the buf struct
 613  *****************************************************************************/
 614 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
 615 {
 616     decoder_sys_t *p_sys = p_dec->p_sys;
 617     picture_t *p_pic;
 618
 619     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
 620     p_dec->fmt_out.video.i_visible_width =
 621         p_sys->p_info->sequence->picture_width;
 622     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
 623     p_dec->fmt_out.video.i_visible_height =
 624         p_sys->p_info->sequence->picture_height;
 625     p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
 626
 627     if( p_sys->p_info->sequence->frame_period > 0 )
 628     {
 629         p_dec->fmt_out.video.i_frame_rate =
 630             (uint32_t)( (uint64_t)1001000000 * 27 /
 631                         p_sys->p_info->sequence->frame_period );
 632         p_dec->fmt_out.video.i_frame_rate_base = 1001;
 633     }
 634
 635     p_dec->fmt_out.i_codec =
 636         ( p_sys->p_info->sequence->chroma_height <
 637           p_sys->p_info->sequence->height ) ?
 638         VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
 639
 640     /* Get a new picture */
 641     p_pic = p_dec->pf_vout_buffer_new( p_dec );
 642
 643     if( p_pic == NULL ) return NULL;
 644
 645     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
 646         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
 647     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
 648         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
 649     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
 650         p_sys->p_info->current_picture->nb_fields : 2;
 651
 652     p_dec->pf_picture_link( p_dec, p_pic );
 653
 654     pp_buf[0] = p_pic->p[0].p_pixels;
 655     pp_buf[1] = p_pic->p[1].p_pixels;
 656     pp_buf[2] = p_pic->p[2].p_pixels;
 657
 658     return p_pic;
 659 }