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 the VideoLAN team
   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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, 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_4_3_PICTURE          2                        /* 4:3 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     int            i_sar_num;
  76     int            i_sar_den;
  77     mtime_t        i_last_frame_pts;
  78
  79 };
  80
  81 /*****************************************************************************
  82  * Local prototypes
  83  *****************************************************************************/
  84 static int  OpenDecoder( vlc_object_t * );
  85 static void CloseDecoder( vlc_object_t * );
  86
  87 static picture_t *DecodeBlock( decoder_t *, block_t ** );
  88
  89 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
  90 static void GetAR( decoder_t *p_dec );
  91
  92 /*****************************************************************************
  93  * Module descriptor
  94  *****************************************************************************/
  95 vlc_module_begin();
  96     set_description( _("MPEG I/II video decoder (using libmpeg2)") );
  97     set_capability( "decoder", 150 );
  98     set_category( CAT_INPUT );
  99     set_subcategory( SUBCAT_INPUT_VCODEC );
 100     set_callbacks( OpenDecoder, CloseDecoder );
 101     add_shortcut( "libmpeg2" );
 102 vlc_module_end();
 103
 104 /*****************************************************************************
 105  * OpenDecoder: probe the decoder and return score
 106  *****************************************************************************/
 107 static int OpenDecoder( vlc_object_t *p_this )
 108 {
 109     decoder_t *p_dec = (decoder_t*)p_this;
 110     decoder_sys_t *p_sys;
 111     uint32_t i_accel = 0;
 112
 113     if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
 114         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
 115         /* Pinnacle hardware-mpeg1 */
 116         p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
 117         /* ATI Video */
 118         p_dec->fmt_in.i_codec != VLC_FOURCC('V','C','R','2') &&
 119         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','2','v') &&
 120         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') &&
 121         p_dec->fmt_in.i_codec != VLC_FOURCC('h','d','v','2') )
 122     {
 123         return VLC_EGENERIC;
 124     }
 125
 126     /* Allocate the memory needed to store the decoder's structure */
 127     if( ( p_dec->p_sys = p_sys =
 128           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
 129     {
 130         msg_Err( p_dec, "out of memory" );
 131         return VLC_EGENERIC;
 132     }
 133
 134     /* Initialize the thread properties */
 135     memset( p_sys, 0, sizeof(decoder_sys_t) );
 136     p_sys->p_mpeg2dec = NULL;
 137     p_sys->p_synchro  = NULL;
 138     p_sys->p_info     = NULL;
 139     p_sys->i_current_pts  = 0;
 140     p_sys->i_previous_pts = 0;
 141     p_sys->i_current_dts  = 0;
 142     p_sys->i_previous_dts = 0;
 143     p_sys->p_picture_to_destroy = NULL;
 144     p_sys->b_garbage_pic = 0;
 145     p_sys->b_slice_i  = 0;
 146     p_sys->b_skip     = 0;
 147     p_sys->b_preroll = VLC_FALSE;
 148
 149 #if defined( __i386__ ) || defined( __x86_64__ )
 150     if( p_dec->p_libvlc_global->i_cpu & CPU_CAPABILITY_MMX )
 151     {
 152         i_accel |= MPEG2_ACCEL_X86_MMX;
 153     }
 154
 155     if( p_dec->p_libvlc_global->i_cpu & CPU_CAPABILITY_3DNOW )
 156     {
 157         i_accel |= MPEG2_ACCEL_X86_3DNOW;
 158     }
 159
 160     if( p_dec->p_libvlc_global->i_cpu & CPU_CAPABILITY_MMXEXT )
 161     {
 162         i_accel |= MPEG2_ACCEL_X86_MMXEXT;
 163     }
 164
 165 #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
 166     if( p_dec->p_libvlc_global->i_cpu & CPU_CAPABILITY_ALTIVEC )
 167     {
 168         i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
 169     }
 170
 171 #else
 172     /* If we do not know this CPU, trust libmpeg2's feature detection */
 173     i_accel = MPEG2_ACCEL_DETECT;
 174
 175 #endif
 176
 177     /* Set CPU acceleration features */
 178     mpeg2_accel( i_accel );
 179
 180     /* Initialize decoder */
 181     p_sys->p_mpeg2dec = mpeg2_init();
 182     if( p_sys->p_mpeg2dec == NULL)
 183     {
 184         msg_Err( p_dec, "mpeg2_init() failed" );
 185         free( p_sys );
 186         return VLC_EGENERIC;
 187     }
 188
 189     p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
 190
 191     p_dec->pf_decode_video = DecodeBlock;
 192
 193     return VLC_SUCCESS;
 194 }
 195
 196 /*****************************************************************************
 197  * RunDecoder: the libmpeg2 decoder
 198  *****************************************************************************/
 199 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 200 {
 201     decoder_sys_t   *p_sys = p_dec->p_sys;
 202     mpeg2_state_t   state;
 203     picture_t       *p_pic;
 204
 205     block_t *p_block;
 206
 207     if( !pp_block || !*pp_block ) return NULL;
 208
 209     p_block = *pp_block;
 210
 211     while( 1 )
 212     {
 213         state = mpeg2_parse( p_sys->p_mpeg2dec );
 214
 215         switch( state )
 216         {
 217         case STATE_BUFFER:
 218             if( !p_block->i_buffer )
 219             {
 220                 block_Release( p_block );
 221                 return NULL;
 222             }
 223
 224             if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
 225                                       | BLOCK_FLAG_CORRUPTED)) &&
 226                 p_sys->p_synchro &&
 227                 p_sys->p_info->sequence &&
 228                 p_sys->p_info->sequence->width != (unsigned)-1 )
 229             {
 230                 vout_SynchroReset( p_sys->p_synchro );
 231                 if( p_sys->p_info->current_fbuf != NULL
 232                     && p_sys->p_info->current_fbuf->id != NULL )
 233                 {
 234                     p_sys->b_garbage_pic = 1;
 235                     p_pic = p_sys->p_info->current_fbuf->id;
 236                 }
 237                 else
 238                 {
 239                     uint8_t *buf[3];
 240                     buf[0] = buf[1] = buf[2] = NULL;
 241                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 242                         break;
 243                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 244                     mpeg2_stride( p_sys->p_mpeg2dec, p_pic->format.i_width );
 245                 }
 246                 p_sys->p_picture_to_destroy = p_pic;
 247
 248                 if ( p_sys->b_slice_i )
 249                 {
 250                     vout_SynchroNewPicture( p_sys->p_synchro,
 251                         I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
 252                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 253                     vout_SynchroDecode( p_sys->p_synchro );
 254                     vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 255                 }
 256             }
 257
 258             if( p_block->i_flags & BLOCK_FLAG_PREROLL )
 259             {
 260                 p_sys->b_preroll = VLC_TRUE;
 261             }
 262             else if( p_sys->b_preroll )
 263             {
 264                 p_sys->b_preroll = VLC_FALSE;
 265                 /* Reset synchro */
 266                 vout_SynchroReset( p_sys->p_synchro );
 267             }
 268
 269 #ifdef PIC_FLAG_PTS
 270             if( p_block->i_pts )
 271             {
 272                 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 273
 274 #else /* New interface */
 275             if( p_block->i_pts || p_block->i_dts )
 276             {
 277                 mpeg2_tag_picture( p_sys->p_mpeg2dec,
 278                                    (uint32_t)p_block->i_pts,
 279                                    (uint32_t)p_block->i_dts );
 280 #endif
 281                 p_sys->i_previous_pts = p_sys->i_current_pts;
 282                 p_sys->i_current_pts = p_block->i_pts;
 283                 p_sys->i_previous_dts = p_sys->i_current_dts;
 284                 p_sys->i_current_dts = p_block->i_dts;
 285             }
 286
 287             p_sys->i_current_rate = p_block->i_rate;
 288
 289             mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 290                           p_block->p_buffer + p_block->i_buffer );
 291
 292             p_block->i_buffer = 0;
 293             break;
 294
 295 #ifdef STATE_SEQUENCE_MODIFIED
 296         case STATE_SEQUENCE_MODIFIED:
 297             GetAR( p_dec );
 298             break;
 299 #endif
 300
 301         case STATE_SEQUENCE:
 302         {
 303             /* Initialize video output */
 304             uint8_t *buf[3];
 305             buf[0] = buf[1] = buf[2] = NULL;
 306
 307             GetAR( p_dec );
 308
 309             mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 310
 311             /* Set the first 2 reference frames */
 312             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 313
 314             if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 315             {
 316                 block_Release( p_block );
 317                 return NULL;
 318             }
 319
 320             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 321             mpeg2_stride( p_sys->p_mpeg2dec, p_pic->format.i_width );
 322
 323             /* This picture will never go through display_picture. */
 324             p_pic->date = 0;
 325
 326             /* For some reason, libmpeg2 will put this pic twice in
 327              * discard_picture. This can be considered a bug in libmpeg2. */
 328             p_dec->pf_picture_link( p_dec, p_pic );
 329
 330             if( p_sys->p_synchro )
 331             {
 332                 vout_SynchroRelease( p_sys->p_synchro );
 333             }
 334             p_sys->p_synchro = vout_SynchroInit( p_dec,
 335                 (uint32_t)((uint64_t)1001000000 * 27 /
 336                 p_sys->p_info->sequence->frame_period) );
 337             p_sys->b_after_sequence_header = 1;
 338         }
 339         break;
 340
 341         case STATE_PICTURE_2ND:
 342             vout_SynchroNewPicture( p_sys->p_synchro,
 343                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 344                 p_sys->p_info->current_picture->nb_fields,
 345                 0, 0, p_sys->i_current_rate,
 346                 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 347
 348             if( p_sys->b_skip )
 349             {
 350                 vout_SynchroTrash( p_sys->p_synchro );
 351             }
 352             else
 353             {
 354                 vout_SynchroDecode( p_sys->p_synchro );
 355             }
 356             break;
 357
 358         case STATE_PICTURE:
 359         {
 360             uint8_t *buf[3];
 361             mtime_t i_pts, i_dts;
 362             buf[0] = buf[1] = buf[2] = NULL;
 363
 364             if ( p_sys->b_after_sequence_header &&
 365                  ((p_sys->p_info->current_picture->flags &
 366                        PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
 367             {
 368                 /* Intra-slice refresh. Simulate a blank I picture. */
 369                 msg_Dbg( p_dec, "intra-slice refresh stream" );
 370                 vout_SynchroNewPicture( p_sys->p_synchro,
 371                     I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
 372                     p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 373                 vout_SynchroDecode( p_sys->p_synchro );
 374                 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 375                 p_sys->b_slice_i = 1;
 376             }
 377             p_sys->b_after_sequence_header = 0;
 378
 379 #ifdef PIC_FLAG_PTS
 380             i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
 381                 ( ( p_sys->p_info->current_picture->pts ==
 382                     (uint32_t)p_sys->i_current_pts ) ?
 383                   p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 384             i_dts = 0;
 385
 386             /* Hack to handle demuxers which only have DTS timestamps */
 387             if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
 388             {
 389                 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
 390                     (p_sys->p_info->current_picture->flags &
 391                       PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 392                 {
 393                     i_pts = p_block->i_dts;
 394                 }
 395             }
 396             p_block->i_pts = p_block->i_dts = 0;
 397             /* End hack */
 398
 399 #else /* New interface */
 400
 401             i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
 402                 ( ( p_sys->p_info->current_picture->tag ==
 403                     (uint32_t)p_sys->i_current_pts ) ?
 404                   p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 405             i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
 406                 ( ( p_sys->p_info->current_picture->tag2 ==
 407                     (uint32_t)p_sys->i_current_dts ) ?
 408                   p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
 409 #endif
 410
 411             vout_SynchroNewPicture( p_sys->p_synchro,
 412                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 413                 p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
 414                 p_sys->i_current_rate,
 415                 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 416
 417             if( !p_dec->b_pace_control && !p_sys->b_preroll &&
 418                 !(p_sys->b_slice_i
 419                    && ((p_sys->p_info->current_picture->flags
 420                          & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
 421                    && !vout_SynchroChoose( p_sys->p_synchro,
 422                               p_sys->p_info->current_picture->flags
 423                                 & PIC_MASK_CODING_TYPE,
 424                               /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
 425                               p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
 426             {
 427                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 428                 p_sys->b_skip = 1;
 429                 vout_SynchroTrash( p_sys->p_synchro );
 430                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 431             }
 432             else
 433             {
 434                 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
 435                 p_sys->b_skip = 0;
 436                 vout_SynchroDecode( p_sys->p_synchro );
 437
 438                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 439                 {
 440                     block_Release( p_block );
 441                     return NULL;
 442                 }
 443
 444                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 445                 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->format.i_width );
 446             }
 447         }
 448         break;
 449
 450         case STATE_END:
 451         case STATE_SLICE:
 452             p_pic = NULL;
 453             if( p_sys->p_info->display_fbuf
 454                 && p_sys->p_info->display_fbuf->id )
 455             {
 456                 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
 457
 458                 vout_SynchroEnd( p_sys->p_synchro,
 459                             p_sys->p_info->display_picture->flags
 460                              & PIC_MASK_CODING_TYPE,
 461                             p_sys->b_garbage_pic );
 462                 p_sys->b_garbage_pic = 0;
 463
 464                 if ( p_sys->p_picture_to_destroy != p_pic )
 465                 {
 466                     p_pic->date = vout_SynchroDate( p_sys->p_synchro );
 467                 }
 468                 else
 469                 {
 470                     p_sys->p_picture_to_destroy = NULL;
 471                     p_pic->date = 0;
 472                 }
 473             }
 474
 475             if( p_sys->p_info->discard_fbuf &&
 476                 p_sys->p_info->discard_fbuf->id )
 477             {
 478                 p_dec->pf_picture_unlink( p_dec,
 479                                           p_sys->p_info->discard_fbuf->id );
 480             }
 481
 482             /* For still frames */
 483             if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;
 484
 485             if( p_pic )
 486             {
 487                 /* Avoid frames with identical timestamps.
 488                  * Especially needed for still frames in DVD menus. */
 489                 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
 490                 p_sys->i_last_frame_pts = p_pic->date;
 491
 492                 return p_pic;
 493             }
 494
 495             break;
 496
 497         case STATE_INVALID:
 498         {
 499             uint8_t *buf[3];
 500             buf[0] = buf[1] = buf[2] = NULL;
 501
 502             msg_Warn( p_dec, "invalid picture encountered" );
 503             if ( ( p_sys->p_info->current_picture == NULL ) ||
 504                ( ( p_sys->p_info->current_picture->flags &
 505                    PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
 506             {
 507                 if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
 508             }
 509             mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 510             p_sys->b_skip = 1;
 511
 512             if( p_sys->p_info->current_fbuf &&
 513                 p_sys->p_info->current_fbuf->id )
 514             {
 515                 p_sys->b_garbage_pic = 1;
 516                 p_pic = p_sys->p_info->current_fbuf->id;
 517             }
 518             else if( !p_sys->p_info->sequence )
 519             {
 520                 break;
 521             }
 522             else
 523             {
 524                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 525                     break;
 526                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 527                 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->format.i_width );
 528             }
 529             p_sys->p_picture_to_destroy = p_pic;
 530
 531             memset( p_pic->p[0].p_pixels, 0,
 532                     p_sys->p_info->sequence->width
 533                      * p_sys->p_info->sequence->height );
 534             memset( p_pic->p[1].p_pixels, 0x80,
 535                     p_sys->p_info->sequence->width
 536                      * p_sys->p_info->sequence->height / 4 );
 537             memset( p_pic->p[2].p_pixels, 0x80,
 538                     p_sys->p_info->sequence->width
 539                      * p_sys->p_info->sequence->height / 4 );
 540
 541             if( p_sys->b_slice_i )
 542             {
 543                 vout_SynchroNewPicture( p_sys->p_synchro,
 544                         I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
 545                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 546                 vout_SynchroDecode( p_sys->p_synchro );
 547                 vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 548             }
 549             break;
 550         }
 551
 552         default:
 553             break;
 554         }
 555     }
 556
 557     /* Never reached */
 558     return NULL;
 559 }
 560
 561 /*****************************************************************************
 562  * CloseDecoder: libmpeg2 decoder destruction
 563  *****************************************************************************/
 564 static void CloseDecoder( vlc_object_t *p_this )
 565 {
 566     decoder_t *p_dec = (decoder_t *)p_this;
 567     decoder_sys_t *p_sys = p_dec->p_sys;
 568
 569     if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
 570
 571     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 572
 573     free( p_sys );
 574 }
 575
 576 /*****************************************************************************
 577  * GetNewPicture: Get a new picture from the vout and set the buf struct
 578  *****************************************************************************/
 579 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
 580 {
 581     decoder_sys_t *p_sys = p_dec->p_sys;
 582     picture_t *p_pic;
 583
 584     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
 585     p_dec->fmt_out.video.i_visible_width =
 586         p_sys->p_info->sequence->picture_width;
 587     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
 588     p_dec->fmt_out.video.i_visible_height =
 589         p_sys->p_info->sequence->picture_height;
 590     p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
 591     p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
 592     p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
 593
 594     if( p_sys->p_info->sequence->frame_period > 0 )
 595     {
 596         p_dec->fmt_out.video.i_frame_rate =
 597             (uint32_t)( (uint64_t)1001000000 * 27 /
 598                         p_sys->p_info->sequence->frame_period );
 599         p_dec->fmt_out.video.i_frame_rate_base = 1001;
 600     }
 601
 602     p_dec->fmt_out.i_codec =
 603         ( p_sys->p_info->sequence->chroma_height <
 604           p_sys->p_info->sequence->height ) ?
 605         VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
 606
 607     /* Get a new picture */
 608     p_pic = p_dec->pf_vout_buffer_new( p_dec );
 609
 610     if( p_pic == NULL ) return NULL;
 611
 612     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
 613         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
 614     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
 615         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
 616     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
 617         p_sys->p_info->current_picture->nb_fields : 2;
 618
 619     p_dec->pf_picture_link( p_dec, p_pic );
 620
 621     pp_buf[0] = p_pic->p[0].p_pixels;
 622     pp_buf[1] = p_pic->p[1].p_pixels;
 623     pp_buf[2] = p_pic->p[2].p_pixels;
 624
 625     return p_pic;
 626 }
 627
 628 /*****************************************************************************
 629  * GetAR: Get aspect ratio
 630  *****************************************************************************/
 631 static void GetAR( decoder_t *p_dec )
 632 {
 633     decoder_sys_t *p_sys = p_dec->p_sys;
 634
 635     /* Check whether the input gave a particular aspect ratio */
 636     if( p_dec->fmt_in.video.i_aspect )
 637     {
 638         p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
 639         if( p_sys->i_aspect <= AR_221_1_PICTURE )
 640         switch( p_sys->i_aspect )
 641         {
 642         case AR_4_3_PICTURE:
 643             p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 644             p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
 645             p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
 646             break;
 647         case AR_16_9_PICTURE:
 648             p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
 649             p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 16;
 650             p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 9;
 651             break;
 652         case AR_221_1_PICTURE:
 653             p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
 654             p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 221;
 655             p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 100;
 656             break;
 657         case AR_SQUARE_PICTURE:
 658             p_sys->i_aspect = VOUT_ASPECT_FACTOR *
 659                            p_sys->p_info->sequence->picture_width /
 660                            p_sys->p_info->sequence->picture_height;
 661             p_sys->i_sar_num = p_sys->i_sar_den = 1;
 662             break;
 663         }
 664     }
 665     else
 666     {
 667         /* Use the value provided in the MPEG sequence header */
 668         if( p_sys->p_info->sequence->pixel_height > 0 )
 669         {
 670             p_sys->i_aspect =
 671                 ((uint64_t)p_sys->p_info->sequence->picture_width) *
 672                 p_sys->p_info->sequence->pixel_width *
 673                 VOUT_ASPECT_FACTOR /
 674                 p_sys->p_info->sequence->picture_height /
 675                 p_sys->p_info->sequence->pixel_height;
 676             p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
 677             p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
 678         }
 679         else
 680         {
 681             /* Invalid aspect, assume 4:3.
 682              * This shouldn't happen and if it does it is a bug
 683              * in libmpeg2 (likely triggered by an invalid stream) */
 684             p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 685             p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
 686             p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
 687         }
 688     }
 689
 690     msg_Dbg( p_dec, "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
 691              p_sys->p_info->sequence->picture_width,
 692              p_sys->p_info->sequence->picture_height,
 693              p_sys->p_info->sequence->display_width,
 694              p_sys->p_info->sequence->display_height,
 695              p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
 696              (uint32_t)((uint64_t)1001000000 * 27 /
 697                  p_sys->p_info->sequence->frame_period / 1001),
 698              (uint32_t)((uint64_t)1001000000 * 27 /
 699                  p_sys->p_info->sequence->frame_period % 1001) );
 700 }