git.sesse.net Git - vlc/blob - modules/codec/xvmc/xxmc.c

   1 /*****************************************************************************
   2  * xxmc.c : HW MPEG decoder thread
   3  *****************************************************************************
   4  * Copyright (C) 2000-2001 VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *          Laurent Aimar <fenrir@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 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_codec.h>
  35 #include <vlc_codec_synchro.h>
  36
  37 #include <unistd.h>
  38 #ifdef __GLIBC__
  39     #include <mcheck.h>
  40 #endif
  41
  42 #include "mpeg2.h"
  43 //#include "attributes.h"
  44 #include "mpeg2_internal.h"
  45 //#include "xvmc_vld.h"
  46
  47 /* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */
  48 #define AR_SQUARE_PICTURE       1                           /* square pixels */
  49 #define AR_3_4_PICTURE          2                        /* 3:4 picture (TV) */
  50 #define AR_16_9_PICTURE         3              /* 16:9 picture (wide screen) */
  51 #define AR_221_1_PICTURE        4                  /* 2.21:1 picture (movie) */
  52
  53 /*****************************************************************************
  54  * decoder_sys_t : libmpeg2 decoder descriptor
  55  *****************************************************************************/
  56 struct decoder_sys_t
  57 {
  58     /*
  59      * libmpeg2 properties
  60      */
  61     mpeg2dec_t          *p_mpeg2dec;
  62     const mpeg2_info_t  *p_info;
  63     bool                b_skip;
  64
  65     /*
  66      * Input properties
  67      */
  68     mtime_t             i_pts;
  69     mtime_t             i_previous_pts;
  70     mtime_t             i_current_pts;
  71     mtime_t             i_previous_dts;
  72     mtime_t             i_current_dts;
  73     int                 i_current_rate;
  74     picture_t *         p_picture_to_destroy;
  75     bool                b_garbage_pic;
  76     bool                b_after_sequence_header; /* is it the next frame after
  77                                                   * the sequence header ?    */
  78     bool                b_slice_i;             /* intra-slice refresh stream */
  79
  80     /*
  81      * Output properties
  82      */
  83     decoder_synchro_t   *p_synchro;
  84     int                 i_aspect;
  85     mtime_t             i_last_frame_pts;
  86 };
  87
  88 /*****************************************************************************
  89  * Local prototypes
  90  *****************************************************************************/
  91
  92 static int  OpenDecoder( vlc_object_t * );
  93 static void CloseDecoder( vlc_object_t * );
  94
  95 static picture_t *DecodeBlock( decoder_t *, block_t ** );
  96
  97 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
  98
  99 /*****************************************************************************
 100  * Module descriptor
 101  *****************************************************************************/
 102 vlc_module_begin ()
 103     set_description( N_("MPEG I/II hw video decoder (using libmpeg2)") )
 104     set_capability( "decoder", 140 )
 105     set_callbacks( OpenDecoder, CloseDecoder )
 106     add_shortcut( "xxmc" )
 107 vlc_module_end ()
 108
 109 /*****************************************************************************
 110  * OpenDecoder: probe the decoder and return score
 111  *****************************************************************************/
 112 static int OpenDecoder( vlc_object_t *p_this )
 113 {
 114
 115     decoder_t *p_dec = (decoder_t*)p_this;
 116     decoder_sys_t *p_sys = NULL;
 117     uint32_t i_accel = 0;
 118     FILE *f_wd_dec;
 119
 120 #ifdef __GLIBC__
 121     mtrace();
 122 #endif
 123     if( p_dec->fmt_in.i_codec != VLC_CODEC_MPGV )
 124         return VLC_EGENERIC;
 125     /* Select onl recognized original format (standard mpeg video) */
 126     switch( p_dec->fmt_in.i_original_fourcc )
 127     {
 128     case VLC_FOURCC('m','p','g','1'):
 129     case VLC_FOURCC('m','p','g','2'):
 130     case VLC_FOURCC('m','p','g','v'):
 131     /* Pinnacle hardware-mpeg1 */
 132     case VLC_FOURCC('P','I','M','1'):
 133     /* VIA hardware-mpeg2 */
 134     case VLC_FOURCC('X','x','M','C'):
 135     /* ATI Video */
 136     case VLC_FOURCC('V','C','R','2'):
 137         break;
 138     default:
 139         if( p_dec->fmt_in.i_original_fourcc )
 140             return VLC_EGENERIC;
 141         break;
 142     }
 143
 144     msg_Dbg(p_dec, "OpenDecoder Entering");
 145
 146     /* Allocate the memory needed to store the decoder's structure */
 147     p_dec->p_sys = p_sys = calloc( 1, sizeof(*p_sys) );
 148     if( !p_sys )
 149         return VLC_ENOMEM;
 150
 151     /* Initialize the thread properties */
 152     p_sys->p_mpeg2dec = NULL;
 153     p_sys->p_synchro  = NULL;
 154     p_sys->p_info     = NULL;
 155     p_sys->i_pts      = mdate() + DEFAULT_PTS_DELAY;
 156     p_sys->i_current_pts  = 0;
 157     p_sys->i_previous_pts = 0;
 158     p_sys->i_current_dts  = 0;
 159     p_sys->i_previous_dts = 0;
 160     p_sys->p_picture_to_destroy = NULL;
 161     p_sys->b_garbage_pic = 0;
 162     p_sys->b_slice_i  = 0;
 163     p_sys->b_skip     = 0;
 164
 165 #if defined( __i386__ )
 166     if( vlc_CPU() & CPU_CAPABILITY_MMX )
 167     {
 168         i_accel |= MPEG2_ACCEL_X86_MMX;
 169     }
 170
 171     if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
 172     {
 173         i_accel |= MPEG2_ACCEL_X86_3DNOW;
 174     }
 175
 176     if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
 177     {
 178         i_accel |= MPEG2_ACCEL_X86_MMXEXT;
 179     }
 180
 181 #elif defined( __powerpc__ ) || defined( SYS_DARWIN )
 182     if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
 183     {
 184         i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
 185     }
 186
 187 #else
 188     /* If we do not know this CPU, trust libmpeg2's feature detection */
 189     i_accel = MPEG2_ACCEL_DETECT;
 190
 191 #endif
 192
 193     /* Set CPU acceleration features */
 194     mpeg2_accel( i_accel );
 195
 196     /* Initialize decoder */
 197     p_sys->p_mpeg2dec = mpeg2_init();
 198     if( p_sys->p_mpeg2dec == NULL)
 199     {
 200         msg_Err( p_dec, "mpeg2_init() failed" );
 201         free( p_sys );
 202         return VLC_EGENERIC;
 203     }
 204
 205     p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
 206
 207     p_dec->pf_decode_video = DecodeBlock;
 208     p_dec->fmt_out.i_cat = VIDEO_ES;
 209     p_dec->fmt_out.i_codec = 0;
 210
 211     f_wd_dec = fopen("/vlc/dec_pid", "w");
 212     if (f_wd_dec != NULL)
 213     {
 214         fprintf(f_wd_dec, "%d\n", getpid());
 215         fflush(f_wd_dec);
 216         fclose(f_wd_dec);
 217     }
 218
 219     msg_Dbg(p_dec, "OpenDecoder Leaving");
 220     return VLC_SUCCESS;
 221 }
 222
 223 static void WriteDecodeFile(int value)
 224 {
 225     FILE *f_wd_ok;
 226
 227     f_wd_ok = fopen("/vlc/dec_ok", "w");
 228     if (f_wd_ok != NULL)
 229     {
 230         fprintf(f_wd_ok, "%d", value);
 231         fflush(f_wd_ok);
 232         fclose(f_wd_ok);
 233     }
 234 }
 235
 236 /*****************************************************************************
 237  * RunDecoder: the libmpeg2 decoder
 238  *****************************************************************************/
 239 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 240 {
 241     decoder_sys_t   *p_sys = p_dec->p_sys;
 242     mpeg2_state_t   state;
 243     picture_t       *p_pic;
 244
 245     block_t *p_block;
 246
 247     if( !pp_block || !*pp_block )
 248         return NULL;
 249
 250     p_block = *pp_block;
 251     while( 1 )
 252     {
 253         state = mpeg2_parse( p_sys->p_mpeg2dec );
 254         switch( state )
 255         {
 256             case STATE_BUFFER:
 257                 if( !p_block->i_buffer )
 258                 {
 259                     block_Release( p_block );
 260                     return NULL;
 261                 }
 262                 if( (p_block->i_flags&BLOCK_FLAG_DISCONTINUITY) &&
 263                     p_sys->p_synchro &&
 264                     p_sys->p_info->sequence &&
 265                     p_sys->p_info->sequence->width != (unsigned int)-1 )
 266                 {
 267                     decoder_SynchroReset( p_sys->p_synchro );
 268                     if( p_sys->p_info->current_fbuf != NULL
 269                         && p_sys->p_info->current_fbuf->id != NULL )
 270                     {
 271                         p_sys->b_garbage_pic = 1;
 272                         p_pic = p_sys->p_info->current_fbuf->id;
 273                     }
 274                     else
 275                     {
 276                         uint8_t *buf[3];
 277                         buf[0] = buf[1] = buf[2] = NULL;
 278                         if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 279                             break;
 280                         mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 281                     }
 282                     p_sys->p_picture_to_destroy = p_pic;
 283
 284                     if ( p_sys->b_slice_i )
 285                     {
 286                         decoder_SynchroNewPicture( p_sys->p_synchro,
 287                             I_CODING_TYPE, 2, 0, 0,
 288                             p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 289                         decoder_SynchroDecode( p_sys->p_synchro );
 290                         decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 291                     }
 292                 }
 293
 294 #ifdef PIC_FLAG_PTS
 295                 if( p_block->i_pts )
 296                 {
 297                     mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 298
 299 #else /* New interface */
 300                 if( p_block->i_pts || p_block->i_dts )
 301                 {
 302                     mpeg2_tag_picture( p_sys->p_mpeg2dec,
 303                                         (uint32_t)p_block->i_pts,
 304                                         (uint32_t)p_block->i_dts );
 305 #endif
 306                     p_sys->i_previous_pts = p_sys->i_current_pts;
 307                     p_sys->i_current_pts = p_block->i_pts;
 308                     p_sys->i_previous_dts = p_sys->i_current_dts;
 309                     p_sys->i_current_dts = p_block->i_dts;
 310                 }
 311                 p_sys->i_current_rate = p_block->i_rate;
 312
 313                 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 314                                 p_block->p_buffer + p_block->i_buffer );
 315                 p_block->i_buffer = 0;
 316                 break;
 317
 318             case STATE_SEQUENCE:
 319             {
 320                 /* Initialize video output */
 321                 uint8_t *buf[3];
 322                 buf[0] = buf[1] = buf[2] = NULL;
 323
 324                 /* Check whether the input gave a particular aspect ratio */
 325                 if( p_dec->fmt_in.video.i_aspect )
 326                 {
 327                     p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
 328                     if( p_sys->i_aspect <= AR_221_1_PICTURE )
 329                     switch( p_sys->i_aspect )
 330                     {
 331                     case AR_3_4_PICTURE:
 332                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 333                         break;
 334                     case AR_16_9_PICTURE:
 335                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
 336                         break;
 337                     case AR_221_1_PICTURE:
 338                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
 339                         break;
 340                     case AR_SQUARE_PICTURE:
 341                         p_sys->i_aspect = VOUT_ASPECT_FACTOR *
 342                                     p_sys->p_info->sequence->width /
 343                                     p_sys->p_info->sequence->height;
 344                         break;
 345                     }
 346                 }
 347                 else
 348                 {
 349                     /* Use the value provided in the MPEG sequence header */
 350                     if( p_sys->p_info->sequence->pixel_height > 0 )
 351                     {
 352                         p_sys->i_aspect =
 353                             ((uint64_t)p_sys->p_info->sequence->display_width) *
 354                             p_sys->p_info->sequence->pixel_width *
 355                             VOUT_ASPECT_FACTOR /
 356                             p_sys->p_info->sequence->display_height /
 357                             p_sys->p_info->sequence->pixel_height;
 358                     }
 359                     else
 360                     {
 361                         /* Invalid aspect, assume 4:3.
 362                         * This shouldn't happen and if it does it is a bug
 363                         * in libmpeg2 (likely triggered by an invalid stream) */
 364                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 365                     }
 366                 }
 367
 368                 msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
 369                         p_sys->p_info->sequence->width,
 370                         p_sys->p_info->sequence->height, p_sys->i_aspect,
 371                         (uint32_t)((uint64_t)1001000000 * 27 /
 372                             p_sys->p_info->sequence->frame_period / 1001),
 373                         (uint32_t)((uint64_t)1001000000 * 27 /
 374                             p_sys->p_info->sequence->frame_period % 1001) );
 375
 376                 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 377
 378                 /* Set the first 2 reference frames */
 379                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 380
 381                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 382                 {
 383                     block_Release( p_block );
 384                     return NULL;
 385                 }
 386                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 387
 388                 p_pic->date = 0;
 389                 decoder_LinkPicture( p_dec, p_pic );
 390
 391                 if( p_sys->p_synchro )
 392                 {
 393                     decoder_SynchroRelease( p_sys->p_synchro );
 394                 }
 395                 p_sys->p_synchro = decoder_SynchroInit( p_dec,
 396                     (uint32_t)((uint64_t)1001000000 * 27 /
 397                     p_sys->p_info->sequence->frame_period) );
 398                 p_sys->b_after_sequence_header = 1;
 399             }
 400             break;
 401
 402             case STATE_PICTURE_2ND:
 403                 decoder_SynchroNewPicture( p_sys->p_synchro,
 404                         p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 405                         p_sys->p_info->current_picture->nb_fields,
 406                         0, 0,
 407                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 408
 409                 if( p_sys->b_skip )
 410                 {
 411                     decoder_SynchroTrash( p_sys->p_synchro );
 412                 }
 413                 else
 414                 {
 415                     decoder_SynchroDecode( p_sys->p_synchro );
 416                 }
 417                 break;
 418
 419             case STATE_PICTURE:
 420             {
 421                 uint8_t *buf[3];
 422                 mtime_t i_pts;
 423                 buf[0] = buf[1] = buf[2] = NULL;
 424
 425                 if ( p_sys->b_after_sequence_header &&
 426                     ((p_sys->p_info->current_picture->flags &
 427                         PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
 428                 {
 429                     /* Intra-slice refresh. Simulate a blank I picture. */
 430                     msg_Dbg( p_dec, "intra-slice refresh stream" );
 431                     decoder_SynchroNewPicture( p_sys->p_synchro,
 432                         I_CODING_TYPE, 2, 0, 0,
 433                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 434                     decoder_SynchroDecode( p_sys->p_synchro );
 435                     decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 436                     p_sys->b_slice_i = 1;
 437                 }
 438                 p_sys->b_after_sequence_header = 0;
 439
 440 #ifdef PIC_FLAG_PTS
 441                 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
 442                     ( ( p_sys->p_info->current_picture->pts ==
 443                         (uint32_t)p_sys->i_current_pts ) ?
 444                     p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 445 #else /* New interface */
 446                 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
 447                     ( ( p_sys->p_info->current_picture->tag ==
 448                         (uint32_t)p_sys->i_current_pts ) ?
 449                     p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 450 #endif
 451                 /* Hack to handle demuxers which only have DTS timestamps */
 452                 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
 453                 {
 454                     if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
 455                         (p_sys->p_info->current_picture->flags &
 456                         PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 457                     {
 458                         i_pts = p_block->i_dts;
 459                     }
 460                 }
 461                 p_block->i_pts = p_block->i_dts = 0;
 462                 /* End hack */
 463
 464                 decoder_SynchroNewPicture( p_sys->p_synchro,
 465                     p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 466                     p_sys->p_info->current_picture->nb_fields, i_pts,
 467                     0,
 468                     p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 469
 470                 if ( !(p_sys->b_slice_i
 471                     && ((p_sys->p_info->current_picture->flags
 472                             & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
 473                     && !decoder_SynchroChoose( p_sys->p_synchro,
 474                                 p_sys->p_info->current_picture->flags
 475                                     & PIC_MASK_CODING_TYPE,
 476                                 /*FindVout(p_dec)->render_time*/ 0 /*FIXME*/,
 477                                 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
 478                 {
 479                     mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 480                     p_sys->b_skip = 1;
 481                     decoder_SynchroTrash( p_sys->p_synchro );
 482                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 483                 }
 484                 else
 485                 {
 486                     mpeg2_skip( p_sys->p_mpeg2dec, 0 );
 487                     p_sys->b_skip = 0;
 488                     decoder_SynchroDecode( p_sys->p_synchro );
 489
 490                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 491                     {
 492                         block_Release( p_block );
 493                         return NULL;
 494                     }
 495
 496                     //p_sys->p_mpeg2dec->ptr_forward_ref_picture = p_sys->p_mpeg2dec->fbuf[2]->id;
 497                     //p_sys->p_mpeg2dec->ptr_backward_ref_picture = p_sys->p_mpeg2dec->fbuf[1]->id;
 498
 499                     if ((p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE) != B_CODING_TYPE)
 500                     {
 501                         //if (p_sys->p_mpeg2dec->ptr_forward_ref_picture &&
 502                         //    p_sys->p_mpeg2dec->ptr_forward_ref_picture != picture->backward_reference_frame)
 503                         //    p_pic->forward_reference_frame->free (p_pic->forward_reference_frame);
 504
 505                         //p_sys->p_mpeg2dec->ptr_forward_ref_picture =
 506                         //            p_sys->p_mpeg2dec->ptr_backward_ref_picture;
 507                         //p_sys->p_mpeg2dec->ptr_backward_ref_picture = (void *)p_pic;
 508                     }
 509                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 510                 }
 511             }
 512             break;
 513
 514             case STATE_END:
 515             case STATE_SLICE:
 516                 p_pic = NULL;
 517                 if( p_sys->p_info->display_fbuf
 518                     && p_sys->p_info->display_fbuf->id )
 519                 {
 520                     p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
 521
 522                     decoder_SynchroEnd( p_sys->p_synchro,
 523                                 p_sys->p_info->display_picture->flags
 524                                 & PIC_MASK_CODING_TYPE,
 525                                 p_sys->b_garbage_pic );
 526                     p_sys->b_garbage_pic = 0;
 527
 528                     if ( p_sys->p_picture_to_destroy != p_pic )
 529                     {
 530                         p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
 531                     }
 532                     else
 533                     {
 534                         p_sys->p_picture_to_destroy = NULL;
 535                         p_pic->date = 0;
 536                     }
 537                 }
 538
 539                 if( p_sys->p_info->discard_fbuf &&
 540                     p_sys->p_info->discard_fbuf->id )
 541                 {
 542                     decoder_UnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
 543                 }
 544                 /* For still frames */
 545                 //if( state == STATE_END && p_pic ) p_pic->b_force = true;
 546
 547                 if( p_pic )
 548                 {
 549 #if 0
 550                     /* Avoid frames with identical timestamps.
 551                      * Especially needed for still frames in DVD menus. */
 552                      if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
 553                         p_sys->i_last_frame_pts = p_pic->date;
 554 #endif
 555                     return p_pic;
 556                 }
 557                 break;
 558
 559             case STATE_INVALID:
 560             {
 561                 uint8_t *buf[3];
 562                 buf[0] = buf[1] = buf[2] = NULL;
 563
 564                 msg_Warn( p_dec, "invalid picture encountered" );
 565                 if ( ( p_sys->p_info->current_picture == NULL ) ||
 566                 ( ( p_sys->p_info->current_picture->flags &
 567                     PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
 568                 {
 569                     if( p_sys->p_synchro ) decoder_SynchroReset( p_sys->p_synchro );
 570                 }
 571                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 572                 p_sys->b_skip = 1;
 573
 574                 if( p_sys->p_info->current_fbuf &&
 575                     p_sys->p_info->current_fbuf->id )
 576                 {
 577                     p_sys->b_garbage_pic = 1;
 578                     p_pic = p_sys->p_info->current_fbuf->id;
 579                 }
 580                 else if( !p_sys->p_info->sequence )
 581                 {
 582                     break;
 583                 }
 584                 else
 585                 {
 586                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 587                         break;
 588                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 589                 }
 590                 p_sys->p_picture_to_destroy = p_pic;
 591
 592                 memset( p_pic->p[0].p_pixels, 0,
 593                         p_sys->p_info->sequence->width
 594                         * p_sys->p_info->sequence->height );
 595                 memset( p_pic->p[1].p_pixels, 0x80,
 596                         p_sys->p_info->sequence->width
 597                         * p_sys->p_info->sequence->height / 4 );
 598                 memset( p_pic->p[2].p_pixels, 0x80,
 599                         p_sys->p_info->sequence->width
 600                         * p_sys->p_info->sequence->height / 4 );
 601
 602                 if( p_sys->b_slice_i )
 603                 {
 604                     decoder_SynchroNewPicture( p_sys->p_synchro,
 605                         I_CODING_TYPE, 2, 0, 0,
 606                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 607                     decoder_SynchroDecode( p_sys->p_synchro );
 608                     decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 609                 }
 610                 break;
 611             }
 612
 613             default:
 614                 break;
 615         }
 616     }
 617     return NULL;
 618 }
 619
 620 /*****************************************************************************
 621  * CloseDecoder: libmpeg2 decoder destruction
 622  *****************************************************************************/
 623 static void CloseDecoder( vlc_object_t *p_this )
 624 {
 625     decoder_t *p_dec = (decoder_t *)p_this;
 626     decoder_sys_t *p_sys = p_dec->p_sys;
 627     FILE *f_wd_dec;
 628
 629     if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
 630     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 631
 632     f_wd_dec = fopen("/vlc/dec_pid", "w");
 633     if (f_wd_dec != NULL)
 634     {
 635         fprintf(f_wd_dec, "0\n");
 636         fflush(f_wd_dec);
 637         fclose(f_wd_dec);
 638     }
 639     free( p_sys );
 640 }
 641
 642 static double get_aspect_ratio( decoder_t *p_dec )
 643 {
 644     decoder_sys_t *p_sys = p_dec->p_sys;
 645     double ratio;
 646     double mpeg1_pel_ratio[16] = {1.0 /* forbidden */,
 647         1.0, 0.6735, 0.7031, 0.7615, 0.8055, 0.8437, 0.8935, 0.9157,
 648         0.9815, 1.0255, 1.0695, 1.0950, 1.1575, 1.2015, 1.0 /*reserved*/ };
 649
 650     if( !p_sys->p_mpeg2dec->decoder.mpeg1 )
 651     {
 652         /* these hardcoded values are defined on mpeg2 standard for
 653         * aspect ratio. other values are reserved or forbidden.  */
 654         /*switch( p_sys->p_mpeg2dec->decoder.aspect_ratio_information )
 655         {
 656             case 2:
 657                 ratio = 4.0/3.0;
 658                 break;
 659             case 3:
 660                 ratio = 16.0/9.0;
 661                 break;
 662             case 4:
 663                 ratio = 2.11/1.0;
 664                 break;
 665             case 1:
 666                 default:*/
 667                 ratio = (double)p_sys->p_mpeg2dec->decoder.width/(double)p_sys->p_mpeg2dec->decoder.height;
 668         /*    break;
 669         }*/
 670     }
 671     else
 672     {
 673         /* mpeg1 constants refer to pixel aspect ratio */
 674         ratio = (double)p_sys->p_mpeg2dec->decoder.width/(double)p_sys->p_mpeg2dec->decoder.height;
 675         /* ratio /= mpeg1_pel_ratio[p_sys->p_mpeg2dec->decoder.aspect_ratio_information]; */
 676     }
 677     return ratio;
 678 }
 679 /*****************************************************************************
 680  * GetNewPicture: Get a new picture from the vout and set the buf struct
 681  *****************************************************************************/
 682 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
 683 {
 684     //msg_Dbg(p_dec, "GetNewPicture Entering");
 685     decoder_sys_t *p_sys = p_dec->p_sys;
 686     picture_t *p_pic;
 687
 688     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
 689     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
 690     p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
 691
 692     if( p_sys->p_info->sequence->frame_period > 0 )
 693     {
 694         p_dec->fmt_out.video.i_frame_rate =
 695             (uint32_t)( (uint64_t)1001000000 * 27 /
 696                         p_sys->p_info->sequence->frame_period );
 697         p_dec->fmt_out.video.i_frame_rate_base = 1001;
 698     }
 699
 700     p_dec->fmt_out.i_codec =
 701         ( p_sys->p_info->sequence->chroma_height <
 702           p_sys->p_info->sequence->height ) ?
 703         VLC_CODEC_I420 : VLC_CODEC_I422;
 704
 705 #if 0
 706     p_sys->f_wd_nb = fopen("/vlc/dec_nb", "w");
 707     if (p_sys->f_wd_nb != NULL)
 708     {
 709 //      fprintf(p_sys->f_wd_nb, "%d\n", mdate());
 710         fprintf(p_sys->f_wd_nb, "%s\n", mdate());
 711         fflush(p_sys->f_wd_nb);
 712     }
 713 #endif
 714     p_pic = decoder_NewPicture( p_dec );
 715
 716     if( p_pic == NULL ) return NULL;
 717
 718     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
 719         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
 720     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
 721         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
 722     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
 723         p_sys->p_info->current_picture->nb_fields : 2;
 724     p_pic->format.i_frame_rate = p_dec->fmt_out.video.i_frame_rate;
 725     p_pic->format.i_frame_rate_base = p_dec->fmt_out.video.i_frame_rate_base;
 726
 727     decoder_LinkPicture( p_dec, p_pic );
 728
 729     pp_buf[0] = p_pic->p[0].p_pixels;
 730     pp_buf[1] = p_pic->p[1].p_pixels;
 731     pp_buf[2] = p_pic->p[2].p_pixels;
 732
 733     /* let driver ensure this image has the right format */
 734 #if 0
 735     this->driver->update_frame_format( p_pic->p_sys->p_vout, p_pic,
 736                                        p_dec->fmt_out.video.i_width,
 737                                        p_dec->fmt_out.video.i_height,
 738                                        p_dec->fmt_out.video.i_aspect,
 739                                        format, flags);
 740     mpeg2_xxmc_choose_coding( p_dec, &p_sys->p_mpeg2dec->decoder, p_pic,
 741                               get_aspect_ratio(p_dec), 0 );
 742 #endif
 743     return p_pic;
 744 }