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|BLOCK_FLAG_CORRUPTED)) &&
 220                 p_sys->p_synchro &&
 221                 p_sys->p_info->sequence &&
 222                 p_sys->p_info->sequence->width != (unsigned)-1 )
 223             {
 224                 vout_SynchroReset( p_sys->p_synchro );
 225                 if( p_sys->p_info->current_fbuf != NULL
 226                     && p_sys->p_info->current_fbuf->id != NULL )
 227                 {
 228                     p_sys->b_garbage_pic = 1;
 229                     p_pic = p_sys->p_info->current_fbuf->id;
 230                 }
 231                 else
 232                 {
 233                     uint8_t *buf[3];
 234                     buf[0] = buf[1] = buf[2] = NULL;
 235                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 236                         break;
 237                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 238                 }
 239                 p_sys->p_picture_to_destroy = p_pic;
 240
 241                 if ( p_sys->b_slice_i )
 242                 {
 243                     vout_SynchroNewPicture( p_sys->p_synchro,
 244                         I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 245                     vout_SynchroDecode( p_sys->p_synchro );
 246                     vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 247                 }
 248             }
 249
 250             if( p_block->i_flags & BLOCK_FLAG_PREROLL )
 251             {
 252                 p_sys->b_preroll = VLC_TRUE;
 253             }
 254             else if( p_sys->b_preroll )
 255             {
 256                 p_sys->b_preroll = VLC_FALSE;
 257                 /* Reset synchro */
 258                 vout_SynchroReset( p_sys->p_synchro );
 259             }
 260
 261 #ifdef PIC_FLAG_PTS
 262             if( p_block->i_pts )
 263             {
 264                 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 265
 266 #else /* New interface */
 267             if( p_block->i_pts || p_block->i_dts )
 268             {
 269                 mpeg2_tag_picture( p_sys->p_mpeg2dec,
 270                                    (uint32_t)p_block->i_pts,
 271                                    (uint32_t)p_block->i_dts );
 272 #endif
 273                 p_sys->i_previous_pts = p_sys->i_current_pts;
 274                 p_sys->i_current_pts = p_block->i_pts;
 275                 p_sys->i_previous_dts = p_sys->i_current_dts;
 276                 p_sys->i_current_dts = p_block->i_dts;
 277             }
 278
 279             p_sys->i_current_rate = p_block->i_rate;
 280
 281             mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 282                           p_block->p_buffer + p_block->i_buffer );
 283
 284             p_block->i_buffer = 0;
 285             break;
 286
 287         case STATE_SEQUENCE:
 288         {
 289             /* Initialize video output */
 290             uint8_t *buf[3];
 291             buf[0] = buf[1] = buf[2] = NULL;
 292
 293             /* Check whether the input gave a particular aspect ratio */
 294             if( p_dec->fmt_in.video.i_aspect )
 295             {
 296                 p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
 297                 if( p_sys->i_aspect <= AR_221_1_PICTURE )
 298                 switch( p_sys->i_aspect )
 299                 {
 300                 case AR_3_4_PICTURE:
 301                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 302                     break;
 303                 case AR_16_9_PICTURE:
 304                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
 305                     break;
 306                 case AR_221_1_PICTURE:
 307                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
 308                     break;
 309                 case AR_SQUARE_PICTURE:
 310                     p_sys->i_aspect = VOUT_ASPECT_FACTOR *
 311                                    p_sys->p_info->sequence->width /
 312                                    p_sys->p_info->sequence->height;
 313                     break;
 314                 }
 315             }
 316             else
 317             {
 318                 /* Use the value provided in the MPEG sequence header */
 319                 if( p_sys->p_info->sequence->pixel_height > 0 )
 320                 {
 321                     p_sys->i_aspect =
 322                         ((uint64_t)p_sys->p_info->sequence->display_width) *
 323                         p_sys->p_info->sequence->pixel_width *
 324                         VOUT_ASPECT_FACTOR /
 325                         p_sys->p_info->sequence->display_height /
 326                         p_sys->p_info->sequence->pixel_height;
 327                 }
 328                 else
 329                 {
 330                     /* Invalid aspect, assume 4:3.
 331                      * This shouldn't happen and if it does it is a bug
 332                      * in libmpeg2 (likely triggered by an invalid stream) */
 333                     p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 334                 }
 335             }
 336
 337             msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
 338                      p_sys->p_info->sequence->width,
 339                      p_sys->p_info->sequence->height, p_sys->i_aspect,
 340                      (uint32_t)((uint64_t)1001000000 * 27 /
 341                          p_sys->p_info->sequence->frame_period / 1001),
 342                      (uint32_t)((uint64_t)1001000000 * 27 /
 343                          p_sys->p_info->sequence->frame_period % 1001) );
 344
 345             mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 346
 347             /* Set the first 2 reference frames */
 348             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 349
 350             if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 351             {
 352                 block_Release( p_block );
 353                 return NULL;
 354             }
 355
 356             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 357
 358             /* This picture will never go through display_picture. */
 359             p_pic->date = 0;
 360
 361             /* For some reason, libmpeg2 will put this pic twice in
 362              * discard_picture. This can be considered a bug in libmpeg2. */
 363             p_dec->pf_picture_link( p_dec, p_pic );
 364
 365             if( p_sys->p_synchro )
 366             {
 367                 vout_SynchroRelease( p_sys->p_synchro );
 368             }
 369             p_sys->p_synchro = vout_SynchroInit( p_dec,
 370                 (uint32_t)((uint64_t)1001000000 * 27 /
 371                 p_sys->p_info->sequence->frame_period) );
 372             p_sys->b_after_sequence_header = 1;
 373         }
 374         break;
 375
 376         case STATE_PICTURE_2ND:
 377             vout_SynchroNewPicture( p_sys->p_synchro,
 378                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 379                 p_sys->p_info->current_picture->nb_fields,
 380                 0, 0, p_sys->i_current_rate );
 381
 382             if( p_sys->b_skip )
 383             {
 384                 vout_SynchroTrash( p_sys->p_synchro );
 385             }
 386             else
 387             {
 388                 vout_SynchroDecode( p_sys->p_synchro );
 389             }
 390             break;
 391
 392         case STATE_PICTURE:
 393         {
 394             uint8_t *buf[3];
 395             mtime_t i_pts, i_dts;
 396             buf[0] = buf[1] = buf[2] = NULL;
 397
 398             if ( p_sys->b_after_sequence_header &&
 399                  ((p_sys->p_info->current_picture->flags &
 400                        PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
 401             {
 402                 /* Intra-slice refresh. Simulate a blank I picture. */
 403                 msg_Dbg( p_dec, "intra-slice refresh stream" );
 404                 vout_SynchroNewPicture( p_sys->p_synchro,
 405                     I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 406                 vout_SynchroDecode( p_sys->p_synchro );
 407                 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 408                 p_sys->b_slice_i = 1;
 409             }
 410             p_sys->b_after_sequence_header = 0;
 411
 412 #ifdef PIC_FLAG_PTS
 413             i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
 414                 ( ( p_sys->p_info->current_picture->pts ==
 415                     (uint32_t)p_sys->i_current_pts ) ?
 416                   p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 417             i_dts = 0;
 418
 419             /* Hack to handle demuxers which only have DTS timestamps */
 420             if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
 421             {
 422                 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
 423                     (p_sys->p_info->current_picture->flags &
 424                       PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 425                 {
 426                     i_pts = p_block->i_dts;
 427                 }
 428             }
 429             p_block->i_pts = p_block->i_dts = 0;
 430             /* End hack */
 431
 432 #else /* New interface */
 433
 434             i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
 435                 ( ( p_sys->p_info->current_picture->tag ==
 436                     (uint32_t)p_sys->i_current_pts ) ?
 437                   p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 438             i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
 439                 ( ( p_sys->p_info->current_picture->tag2 ==
 440                     (uint32_t)p_sys->i_current_dts ) ?
 441                   p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
 442 #endif
 443
 444             vout_SynchroNewPicture( p_sys->p_synchro,
 445                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 446                 p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
 447                 p_sys->i_current_rate );
 448
 449             if( !p_dec->b_pace_control && !p_sys->b_preroll &&
 450                 !(p_sys->b_slice_i
 451                    && ((p_sys->p_info->current_picture->flags
 452                          & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
 453                    && !vout_SynchroChoose( p_sys->p_synchro,
 454                               p_sys->p_info->current_picture->flags
 455                                 & PIC_MASK_CODING_TYPE,
 456                               /*p_sys->p_vout->render_time*/ 0 /*FIXME*/ ) )
 457             {
 458                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 459                 p_sys->b_skip = 1;
 460                 vout_SynchroTrash( p_sys->p_synchro );
 461                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 462             }
 463             else
 464             {
 465                 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
 466                 p_sys->b_skip = 0;
 467                 vout_SynchroDecode( p_sys->p_synchro );
 468
 469                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 470                 {
 471                     block_Release( p_block );
 472                     return NULL;
 473                 }
 474
 475                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 476             }
 477         }
 478         break;
 479
 480         case STATE_END:
 481         case STATE_SLICE:
 482             p_pic = NULL;
 483             if( p_sys->p_info->display_fbuf
 484                 && p_sys->p_info->display_fbuf->id )
 485             {
 486                 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
 487
 488                 vout_SynchroEnd( p_sys->p_synchro,
 489                             p_sys->p_info->display_picture->flags
 490                              & PIC_MASK_CODING_TYPE,
 491                             p_sys->b_garbage_pic );
 492                 p_sys->b_garbage_pic = 0;
 493
 494                 if ( p_sys->p_picture_to_destroy != p_pic )
 495                 {
 496                     p_pic->date = vout_SynchroDate( p_sys->p_synchro );
 497                 }
 498                 else
 499                 {
 500                     p_sys->p_picture_to_destroy = NULL;
 501                     p_pic->date = 0;
 502                 }
 503             }
 504
 505             if( p_sys->p_info->discard_fbuf &&
 506                 p_sys->p_info->discard_fbuf->id )
 507             {
 508                 p_dec->pf_picture_unlink( p_dec,
 509                                           p_sys->p_info->discard_fbuf->id );
 510             }
 511
 512             /* For still frames */
 513             if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;
 514
 515             if( p_pic )
 516             {
 517                 /* Avoid frames with identical timestamps.
 518                  * Especially needed for still frames in DVD menus. */
 519                 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
 520                 p_sys->i_last_frame_pts = p_pic->date;
 521
 522                 return p_pic;
 523             }
 524
 525             break;
 526
 527         case STATE_INVALID:
 528         {
 529             uint8_t *buf[3];
 530             buf[0] = buf[1] = buf[2] = NULL;
 531
 532             msg_Warn( p_dec, "invalid picture encountered" );
 533             if ( ( p_sys->p_info->current_picture == NULL ) ||
 534                ( ( p_sys->p_info->current_picture->flags &
 535                    PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
 536             {
 537                 if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
 538             }
 539             mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 540             p_sys->b_skip = 1;
 541
 542             if( p_sys->p_info->current_fbuf &&
 543                 p_sys->p_info->current_fbuf->id )
 544             {
 545                 p_sys->b_garbage_pic = 1;
 546                 p_pic = p_sys->p_info->current_fbuf->id;
 547             }
 548             else if( !p_sys->p_info->sequence )
 549             {
 550                 break;
 551             }
 552             else
 553             {
 554                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 555                     break;
 556                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 557             }
 558             p_sys->p_picture_to_destroy = p_pic;
 559
 560             memset( p_pic->p[0].p_pixels, 0,
 561                     p_sys->p_info->sequence->width
 562                      * p_sys->p_info->sequence->height );
 563             memset( p_pic->p[1].p_pixels, 0x80,
 564                     p_sys->p_info->sequence->width
 565                      * p_sys->p_info->sequence->height / 4 );
 566             memset( p_pic->p[2].p_pixels, 0x80,
 567                     p_sys->p_info->sequence->width
 568                      * p_sys->p_info->sequence->height / 4 );
 569
 570             if( p_sys->b_slice_i )
 571             {
 572                 vout_SynchroNewPicture( p_sys->p_synchro,
 573                             I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 574                 vout_SynchroDecode( p_sys->p_synchro );
 575                 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 576             }
 577             break;
 578         }
 579
 580         default:
 581             break;
 582         }
 583     }
 584
 585     /* Never reached */
 586     return NULL;
 587 }
 588
 589 /*****************************************************************************
 590  * CloseDecoder: libmpeg2 decoder destruction
 591  *****************************************************************************/
 592 static void CloseDecoder( vlc_object_t *p_this )
 593 {
 594     decoder_t *p_dec = (decoder_t *)p_this;
 595     decoder_sys_t *p_sys = p_dec->p_sys;
 596
 597     if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
 598
 599     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 600
 601     free( p_sys );
 602 }
 603
 604 /*****************************************************************************
 605  * GetNewPicture: Get a new picture from the vout and set the buf struct
 606  *****************************************************************************/
 607 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
 608 {
 609     decoder_sys_t *p_sys = p_dec->p_sys;
 610     picture_t *p_pic;
 611
 612     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
 613     p_dec->fmt_out.video.i_visible_width =
 614         p_sys->p_info->sequence->picture_width;
 615     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
 616     p_dec->fmt_out.video.i_visible_height =
 617         p_sys->p_info->sequence->picture_height;
 618     p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
 619
 620     if( p_sys->p_info->sequence->frame_period > 0 )
 621     {
 622         p_dec->fmt_out.video.i_frame_rate =
 623             (uint32_t)( (uint64_t)1001000000 * 27 /
 624                         p_sys->p_info->sequence->frame_period );
 625         p_dec->fmt_out.video.i_frame_rate_base = 1001;
 626     }
 627
 628     p_dec->fmt_out.i_codec =
 629         ( p_sys->p_info->sequence->chroma_height <
 630           p_sys->p_info->sequence->height ) ?
 631         VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
 632
 633     /* Get a new picture */
 634     p_pic = p_dec->pf_vout_buffer_new( p_dec );
 635
 636     if( p_pic == NULL ) return NULL;
 637
 638     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
 639         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
 640     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
 641         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
 642     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
 643         p_sys->p_info->current_picture->nb_fields : 2;
 644
 645     p_dec->pf_picture_link( p_dec, p_pic );
 646
 647     pp_buf[0] = p_pic->p[0].p_pixels;
 648     pp_buf[1] = p_pic->p[1].p_pixels;
 649     pp_buf[2] = p_pic->p[2].p_pixels;
 650
 651     return p_pic;
 652 }