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 #include <vlc_cpu.h>
  37
  38 #include <unistd.h>
  39 #ifdef __GLIBC__
  40     #include <mcheck.h>
  41 #endif
  42
  43 #include "mpeg2.h"
  44 //#include "attributes.h"
  45 #include "mpeg2_internal.h"
  46 //#include "xvmc_vld.h"
  47
  48 /* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */
  49 #define AR_SQUARE_PICTURE       1                           /* square pixels */
  50 #define AR_3_4_PICTURE          2                        /* 3:4 picture (TV) */
  51 #define AR_16_9_PICTURE         3              /* 16:9 picture (wide screen) */
  52 #define AR_221_1_PICTURE        4                  /* 2.21:1 picture (movie) */
  53
  54 /*****************************************************************************
  55  * decoder_sys_t : libmpeg2 decoder descriptor
  56  *****************************************************************************/
  57 struct decoder_sys_t
  58 {
  59     /*
  60      * libmpeg2 properties
  61      */
  62     mpeg2dec_t          *p_mpeg2dec;
  63     const mpeg2_info_t  *p_info;
  64     bool                b_skip;
  65
  66     /*
  67      * Input properties
  68      */
  69     mtime_t             i_pts;
  70     mtime_t             i_previous_pts;
  71     mtime_t             i_current_pts;
  72     mtime_t             i_previous_dts;
  73     mtime_t             i_current_dts;
  74     int                 i_current_rate;
  75     picture_t *         p_picture_to_destroy;
  76     bool                b_garbage_pic;
  77     bool                b_after_sequence_header; /* is it the next frame after
  78                                                   * the sequence header ?    */
  79     bool                b_slice_i;             /* intra-slice refresh stream */
  80
  81     /*
  82      * Output properties
  83      */
  84     decoder_synchro_t   *p_synchro;
  85     int                 i_aspect;
  86     mtime_t             i_last_frame_pts;
  87 };
  88
  89 /*****************************************************************************
  90  * Local prototypes
  91  *****************************************************************************/
  92
  93 static int  OpenDecoder( vlc_object_t * );
  94 static void CloseDecoder( vlc_object_t * );
  95
  96 static picture_t *DecodeBlock( decoder_t *, block_t ** );
  97
  98 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
  99
 100 /*****************************************************************************
 101  * Module descriptor
 102  *****************************************************************************/
 103 vlc_module_begin ()
 104     set_description( N_("MPEG I/II hw video decoder (using libmpeg2)") )
 105     set_capability( "decoder", 140 )
 106     set_callbacks( OpenDecoder, CloseDecoder )
 107     add_shortcut( "xxmc" )
 108 vlc_module_end ()
 109
 110 /*****************************************************************************
 111  * OpenDecoder: probe the decoder and return score
 112  *****************************************************************************/
 113 static int OpenDecoder( vlc_object_t *p_this )
 114 {
 115
 116     decoder_t *p_dec = (decoder_t*)p_this;
 117     decoder_sys_t *p_sys = NULL;
 118     uint32_t i_accel = 0;
 119     FILE *f_wd_dec;
 120
 121 #ifdef __GLIBC__
 122     mtrace();
 123 #endif
 124     if( p_dec->fmt_in.i_codec != VLC_CODEC_MPGV )
 125         return VLC_EGENERIC;
 126     /* Select onl recognized original format (standard mpeg video) */
 127     switch( p_dec->fmt_in.i_original_fourcc )
 128     {
 129     case VLC_FOURCC('m','p','g','1'):
 130     case VLC_FOURCC('m','p','g','2'):
 131     case VLC_FOURCC('m','p','g','v'):
 132     /* Pinnacle hardware-mpeg1 */
 133     case VLC_FOURCC('P','I','M','1'):
 134     /* VIA hardware-mpeg2 */
 135     case VLC_FOURCC('X','x','M','C'):
 136     /* ATI Video */
 137     case VLC_FOURCC('V','C','R','2'):
 138         break;
 139     default:
 140         if( p_dec->fmt_in.i_original_fourcc )
 141             return VLC_EGENERIC;
 142         break;
 143     }
 144
 145     msg_Dbg(p_dec, "OpenDecoder Entering");
 146
 147     /* Allocate the memory needed to store the decoder's structure */
 148     p_dec->p_sys = p_sys = calloc( 1, sizeof(*p_sys) );
 149     if( !p_sys )
 150         return VLC_ENOMEM;
 151
 152     /* Initialize the thread properties */
 153     p_sys->p_mpeg2dec = NULL;
 154     p_sys->p_synchro  = NULL;
 155     p_sys->p_info     = NULL;
 156     p_sys->i_pts      = mdate() + DEFAULT_PTS_DELAY;
 157     p_sys->i_current_pts  = 0;
 158     p_sys->i_previous_pts = 0;
 159     p_sys->i_current_dts  = 0;
 160     p_sys->i_previous_dts = 0;
 161     p_sys->p_picture_to_destroy = NULL;
 162     p_sys->b_garbage_pic = 0;
 163     p_sys->b_slice_i  = 0;
 164     p_sys->b_skip     = 0;
 165
 166 #if defined( __i386__ )
 167     if( vlc_CPU() & CPU_CAPABILITY_MMX )
 168     {
 169         i_accel |= MPEG2_ACCEL_X86_MMX;
 170     }
 171
 172     if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
 173     {
 174         i_accel |= MPEG2_ACCEL_X86_3DNOW;
 175     }
 176
 177     if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
 178     {
 179         i_accel |= MPEG2_ACCEL_X86_MMXEXT;
 180     }
 181
 182 #elif defined( __powerpc__ ) || defined( SYS_DARWIN )
 183     if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
 184     {
 185         i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
 186     }
 187
 188 #else
 189     /* If we do not know this CPU, trust libmpeg2's feature detection */
 190     i_accel = MPEG2_ACCEL_DETECT;
 191
 192 #endif
 193
 194     /* Set CPU acceleration features */
 195     mpeg2_accel( i_accel );
 196
 197     /* Initialize decoder */
 198     p_sys->p_mpeg2dec = mpeg2_init();
 199     if( p_sys->p_mpeg2dec == NULL)
 200     {
 201         msg_Err( p_dec, "mpeg2_init() failed" );
 202         free( p_sys );
 203         return VLC_EGENERIC;
 204     }
 205
 206     p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
 207
 208     p_dec->pf_decode_video = DecodeBlock;
 209     p_dec->fmt_out.i_cat = VIDEO_ES;
 210     p_dec->fmt_out.i_codec = 0;
 211
 212     f_wd_dec = fopen("/vlc/dec_pid", "w");
 213     if (f_wd_dec != NULL)
 214     {
 215         fprintf(f_wd_dec, "%d\n", getpid());
 216         fflush(f_wd_dec);
 217         fclose(f_wd_dec);
 218     }
 219
 220     msg_Dbg(p_dec, "OpenDecoder Leaving");
 221     return VLC_SUCCESS;
 222 }
 223
 224 #if 0
 225 static void WriteDecodeFile(int value)
 226 {
 227     FILE *f_wd_ok;
 228
 229     f_wd_ok = fopen("/vlc/dec_ok", "w");
 230     if (f_wd_ok != NULL)
 231     {
 232         fprintf(f_wd_ok, "%d", value);
 233         fflush(f_wd_ok);
 234         fclose(f_wd_ok);
 235     }
 236 }
 237 #endif
 238
 239 /*****************************************************************************
 240  * RunDecoder: the libmpeg2 decoder
 241  *****************************************************************************/
 242 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 243 {
 244     decoder_sys_t   *p_sys = p_dec->p_sys;
 245     mpeg2_state_t   state;
 246     picture_t       *p_pic;
 247
 248     block_t *p_block;
 249
 250     if( !pp_block || !*pp_block )
 251         return NULL;
 252
 253     p_block = *pp_block;
 254     while( 1 )
 255     {
 256         state = mpeg2_parse( p_sys->p_mpeg2dec );
 257         switch( state )
 258         {
 259             case STATE_BUFFER:
 260                 if( !p_block->i_buffer )
 261                 {
 262                     block_Release( p_block );
 263                     return NULL;
 264                 }
 265                 if( (p_block->i_flags&BLOCK_FLAG_DISCONTINUITY) &&
 266                     p_sys->p_synchro &&
 267                     p_sys->p_info->sequence &&
 268                     p_sys->p_info->sequence->width != (unsigned int)-1 )
 269                 {
 270                     decoder_SynchroReset( p_sys->p_synchro );
 271                     if( p_sys->p_info->current_fbuf != NULL
 272                         && p_sys->p_info->current_fbuf->id != NULL )
 273                     {
 274                         p_sys->b_garbage_pic = 1;
 275                         p_pic = p_sys->p_info->current_fbuf->id;
 276                     }
 277                     else
 278                     {
 279                         uint8_t *buf[3];
 280                         buf[0] = buf[1] = buf[2] = NULL;
 281                         if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 282                             break;
 283                         mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 284                     }
 285                     p_sys->p_picture_to_destroy = p_pic;
 286
 287                     if ( p_sys->b_slice_i )
 288                     {
 289                         decoder_SynchroNewPicture( p_sys->p_synchro,
 290                             I_CODING_TYPE, 2, 0, 0,
 291                             p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 292                         decoder_SynchroDecode( p_sys->p_synchro );
 293                         decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 294                     }
 295                 }
 296
 297 #ifdef PIC_FLAG_PTS
 298                 if( p_block->i_pts )
 299                 {
 300                     mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 301
 302 #else /* New interface */
 303                 if( p_block->i_pts || p_block->i_dts )
 304                 {
 305                     mpeg2_tag_picture( p_sys->p_mpeg2dec,
 306                                         (uint32_t)p_block->i_pts,
 307                                         (uint32_t)p_block->i_dts );
 308 #endif
 309                     p_sys->i_previous_pts = p_sys->i_current_pts;
 310                     p_sys->i_current_pts = p_block->i_pts;
 311                     p_sys->i_previous_dts = p_sys->i_current_dts;
 312                     p_sys->i_current_dts = p_block->i_dts;
 313                 }
 314                 p_sys->i_current_rate = p_block->i_rate;
 315
 316                 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 317                                 p_block->p_buffer + p_block->i_buffer );
 318                 p_block->i_buffer = 0;
 319                 break;
 320
 321             case STATE_SEQUENCE:
 322             {
 323                 /* Initialize video output */
 324                 uint8_t *buf[3];
 325                 buf[0] = buf[1] = buf[2] = NULL;
 326
 327                 /* Check whether the input gave a particular aspect ratio */
 328                 if( p_dec->fmt_in.video.i_aspect )
 329                 {
 330                     p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
 331                     if( p_sys->i_aspect <= AR_221_1_PICTURE )
 332                     switch( p_sys->i_aspect )
 333                     {
 334                     case AR_3_4_PICTURE:
 335                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 336                         break;
 337                     case AR_16_9_PICTURE:
 338                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
 339                         break;
 340                     case AR_221_1_PICTURE:
 341                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
 342                         break;
 343                     case AR_SQUARE_PICTURE:
 344                         p_sys->i_aspect = VOUT_ASPECT_FACTOR *
 345                                     p_sys->p_info->sequence->width /
 346                                     p_sys->p_info->sequence->height;
 347                         break;
 348                     }
 349                 }
 350                 else
 351                 {
 352                     /* Use the value provided in the MPEG sequence header */
 353                     if( p_sys->p_info->sequence->pixel_height > 0 )
 354                     {
 355                         p_sys->i_aspect =
 356                             ((uint64_t)p_sys->p_info->sequence->display_width) *
 357                             p_sys->p_info->sequence->pixel_width *
 358                             VOUT_ASPECT_FACTOR /
 359                             p_sys->p_info->sequence->display_height /
 360                             p_sys->p_info->sequence->pixel_height;
 361                     }
 362                     else
 363                     {
 364                         /* Invalid aspect, assume 4:3.
 365                         * This shouldn't happen and if it does it is a bug
 366                         * in libmpeg2 (likely triggered by an invalid stream) */
 367                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 368                     }
 369                 }
 370
 371                 msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
 372                         p_sys->p_info->sequence->width,
 373                         p_sys->p_info->sequence->height, p_sys->i_aspect,
 374                         (uint32_t)((uint64_t)1001000000 * 27 /
 375                             p_sys->p_info->sequence->frame_period / 1001),
 376                         (uint32_t)((uint64_t)1001000000 * 27 /
 377                             p_sys->p_info->sequence->frame_period % 1001) );
 378
 379                 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 380
 381                 /* Set the first 2 reference frames */
 382                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 383
 384                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 385                 {
 386                     block_Release( p_block );
 387                     return NULL;
 388                 }
 389                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 390
 391                 p_pic->date = 0;
 392                 decoder_LinkPicture( p_dec, p_pic );
 393
 394                 if( p_sys->p_synchro )
 395                 {
 396                     decoder_SynchroRelease( p_sys->p_synchro );
 397                 }
 398                 p_sys->p_synchro = decoder_SynchroInit( p_dec,
 399                     (uint32_t)((uint64_t)1001000000 * 27 /
 400                     p_sys->p_info->sequence->frame_period) );
 401                 p_sys->b_after_sequence_header = 1;
 402             }
 403             break;
 404
 405             case STATE_PICTURE_2ND:
 406                 decoder_SynchroNewPicture( p_sys->p_synchro,
 407                         p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 408                         p_sys->p_info->current_picture->nb_fields,
 409                         0, 0,
 410                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 411
 412                 if( p_sys->b_skip )
 413                 {
 414                     decoder_SynchroTrash( p_sys->p_synchro );
 415                 }
 416                 else
 417                 {
 418                     decoder_SynchroDecode( p_sys->p_synchro );
 419                 }
 420                 break;
 421
 422             case STATE_PICTURE:
 423             {
 424                 uint8_t *buf[3];
 425                 mtime_t i_pts;
 426                 buf[0] = buf[1] = buf[2] = NULL;
 427
 428                 if ( p_sys->b_after_sequence_header &&
 429                     ((p_sys->p_info->current_picture->flags &
 430                         PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
 431                 {
 432                     /* Intra-slice refresh. Simulate a blank I picture. */
 433                     msg_Dbg( p_dec, "intra-slice refresh stream" );
 434                     decoder_SynchroNewPicture( p_sys->p_synchro,
 435                         I_CODING_TYPE, 2, 0, 0,
 436                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 437                     decoder_SynchroDecode( p_sys->p_synchro );
 438                     decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 439                     p_sys->b_slice_i = 1;
 440                 }
 441                 p_sys->b_after_sequence_header = 0;
 442
 443 #ifdef PIC_FLAG_PTS
 444                 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
 445                     ( ( p_sys->p_info->current_picture->pts ==
 446                         (uint32_t)p_sys->i_current_pts ) ?
 447                     p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 448 #else /* New interface */
 449                 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
 450                     ( ( p_sys->p_info->current_picture->tag ==
 451                         (uint32_t)p_sys->i_current_pts ) ?
 452                     p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 453 #endif
 454                 /* Hack to handle demuxers which only have DTS timestamps */
 455                 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
 456                 {
 457                     if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
 458                         (p_sys->p_info->current_picture->flags &
 459                         PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 460                     {
 461                         i_pts = p_block->i_dts;
 462                     }
 463                 }
 464                 p_block->i_pts = p_block->i_dts = 0;
 465                 /* End hack */
 466
 467                 decoder_SynchroNewPicture( p_sys->p_synchro,
 468                     p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 469                     p_sys->p_info->current_picture->nb_fields, i_pts,
 470                     0,
 471                     p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 472
 473                 if ( !(p_sys->b_slice_i
 474                     && ((p_sys->p_info->current_picture->flags
 475                             & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
 476                     && !decoder_SynchroChoose( p_sys->p_synchro,
 477                                 p_sys->p_info->current_picture->flags
 478                                     & PIC_MASK_CODING_TYPE,
 479                                 /*FindVout(p_dec)->render_time*/ 0 /*FIXME*/,
 480                                 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
 481                 {
 482                     mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 483                     p_sys->b_skip = 1;
 484                     decoder_SynchroTrash( p_sys->p_synchro );
 485                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 486                 }
 487                 else
 488                 {
 489                     mpeg2_skip( p_sys->p_mpeg2dec, 0 );
 490                     p_sys->b_skip = 0;
 491                     decoder_SynchroDecode( p_sys->p_synchro );
 492
 493                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 494                     {
 495                         block_Release( p_block );
 496                         return NULL;
 497                     }
 498
 499                     //p_sys->p_mpeg2dec->ptr_forward_ref_picture = p_sys->p_mpeg2dec->fbuf[2]->id;
 500                     //p_sys->p_mpeg2dec->ptr_backward_ref_picture = p_sys->p_mpeg2dec->fbuf[1]->id;
 501
 502                     if ((p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE) != B_CODING_TYPE)
 503                     {
 504                         //if (p_sys->p_mpeg2dec->ptr_forward_ref_picture &&
 505                         //    p_sys->p_mpeg2dec->ptr_forward_ref_picture != picture->backward_reference_frame)
 506                         //    p_pic->forward_reference_frame->free (p_pic->forward_reference_frame);
 507
 508                         //p_sys->p_mpeg2dec->ptr_forward_ref_picture =
 509                         //            p_sys->p_mpeg2dec->ptr_backward_ref_picture;
 510                         //p_sys->p_mpeg2dec->ptr_backward_ref_picture = (void *)p_pic;
 511                     }
 512                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 513                 }
 514             }
 515             break;
 516
 517             case STATE_END:
 518             case STATE_SLICE:
 519                 p_pic = NULL;
 520                 if( p_sys->p_info->display_fbuf
 521                     && p_sys->p_info->display_fbuf->id )
 522                 {
 523                     p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
 524
 525                     decoder_SynchroEnd( p_sys->p_synchro,
 526                                 p_sys->p_info->display_picture->flags
 527                                 & PIC_MASK_CODING_TYPE,
 528                                 p_sys->b_garbage_pic );
 529                     p_sys->b_garbage_pic = 0;
 530
 531                     if ( p_sys->p_picture_to_destroy != p_pic )
 532                     {
 533                         p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
 534                     }
 535                     else
 536                     {
 537                         p_sys->p_picture_to_destroy = NULL;
 538                         p_pic->date = 0;
 539                     }
 540                 }
 541
 542                 if( p_sys->p_info->discard_fbuf &&
 543                     p_sys->p_info->discard_fbuf->id )
 544                 {
 545                     decoder_UnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
 546                 }
 547                 /* For still frames */
 548                 //if( state == STATE_END && p_pic ) p_pic->b_force = true;
 549
 550                 if( p_pic )
 551                 {
 552 #if 0
 553                     /* Avoid frames with identical timestamps.
 554                      * Especially needed for still frames in DVD menus. */
 555                      if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
 556                         p_sys->i_last_frame_pts = p_pic->date;
 557 #endif
 558                     return p_pic;
 559                 }
 560                 break;
 561
 562             case STATE_INVALID:
 563             {
 564                 uint8_t *buf[3];
 565                 buf[0] = buf[1] = buf[2] = NULL;
 566
 567                 msg_Warn( p_dec, "invalid picture encountered" );
 568                 if ( ( p_sys->p_info->current_picture == NULL ) ||
 569                 ( ( p_sys->p_info->current_picture->flags &
 570                     PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
 571                 {
 572                     if( p_sys->p_synchro ) decoder_SynchroReset( p_sys->p_synchro );
 573                 }
 574                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 575                 p_sys->b_skip = 1;
 576
 577                 if( p_sys->p_info->current_fbuf &&
 578                     p_sys->p_info->current_fbuf->id )
 579                 {
 580                     p_sys->b_garbage_pic = 1;
 581                     p_pic = p_sys->p_info->current_fbuf->id;
 582                 }
 583                 else if( !p_sys->p_info->sequence )
 584                 {
 585                     break;
 586                 }
 587                 else
 588                 {
 589                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 590                         break;
 591                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 592                 }
 593                 p_sys->p_picture_to_destroy = p_pic;
 594
 595                 memset( p_pic->p[0].p_pixels, 0,
 596                         p_sys->p_info->sequence->width
 597                         * p_sys->p_info->sequence->height );
 598                 memset( p_pic->p[1].p_pixels, 0x80,
 599                         p_sys->p_info->sequence->width
 600                         * p_sys->p_info->sequence->height / 4 );
 601                 memset( p_pic->p[2].p_pixels, 0x80,
 602                         p_sys->p_info->sequence->width
 603                         * p_sys->p_info->sequence->height / 4 );
 604
 605                 if( p_sys->b_slice_i )
 606                 {
 607                     decoder_SynchroNewPicture( p_sys->p_synchro,
 608                         I_CODING_TYPE, 2, 0, 0,
 609                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 610                     decoder_SynchroDecode( p_sys->p_synchro );
 611                     decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 612                 }
 613                 break;
 614             }
 615
 616             default:
 617                 break;
 618         }
 619     }
 620     return NULL;
 621 }
 622
 623 /*****************************************************************************
 624  * CloseDecoder: libmpeg2 decoder destruction
 625  *****************************************************************************/
 626 static void CloseDecoder( vlc_object_t *p_this )
 627 {
 628     decoder_t *p_dec = (decoder_t *)p_this;
 629     decoder_sys_t *p_sys = p_dec->p_sys;
 630     FILE *f_wd_dec;
 631
 632     if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
 633     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 634
 635     f_wd_dec = fopen("/vlc/dec_pid", "w");
 636     if (f_wd_dec != NULL)
 637     {
 638         fprintf(f_wd_dec, "0\n");
 639         fflush(f_wd_dec);
 640         fclose(f_wd_dec);
 641     }
 642     free( p_sys );
 643 }
 644
 645 #if 0
 646 static double get_aspect_ratio( decoder_t *p_dec )
 647 {
 648     decoder_sys_t *p_sys = p_dec->p_sys;
 649     double ratio;
 650     double mpeg1_pel_ratio[16] = {1.0 /* forbidden */,
 651         1.0, 0.6735, 0.7031, 0.7615, 0.8055, 0.8437, 0.8935, 0.9157,
 652         0.9815, 1.0255, 1.0695, 1.0950, 1.1575, 1.2015, 1.0 /*reserved*/ };
 653
 654     if( !p_sys->p_mpeg2dec->decoder.mpeg1 )
 655     {
 656         /* these hardcoded values are defined on mpeg2 standard for
 657         * aspect ratio. other values are reserved or forbidden.  */
 658         /*switch( p_sys->p_mpeg2dec->decoder.aspect_ratio_information )
 659         {
 660             case 2:
 661                 ratio = 4.0/3.0;
 662                 break;
 663             case 3:
 664                 ratio = 16.0/9.0;
 665                 break;
 666             case 4:
 667                 ratio = 2.11/1.0;
 668                 break;
 669             case 1:
 670                 default:*/
 671                 ratio = (double)p_sys->p_mpeg2dec->decoder.width/(double)p_sys->p_mpeg2dec->decoder.height;
 672         /*    break;
 673         }*/
 674     }
 675     else
 676     {
 677         /* mpeg1 constants refer to pixel aspect ratio */
 678         ratio = (double)p_sys->p_mpeg2dec->decoder.width/(double)p_sys->p_mpeg2dec->decoder.height;
 679         /* ratio /= mpeg1_pel_ratio[p_sys->p_mpeg2dec->decoder.aspect_ratio_information]; */
 680     }
 681     return ratio;
 682 }
 683 #endif
 684
 685 /*****************************************************************************
 686  * GetNewPicture: Get a new picture from the vout and set the buf struct
 687  *****************************************************************************/
 688 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
 689 {
 690     //msg_Dbg(p_dec, "GetNewPicture Entering");
 691     decoder_sys_t *p_sys = p_dec->p_sys;
 692     picture_t *p_pic;
 693
 694     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
 695     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
 696     p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
 697
 698     if( p_sys->p_info->sequence->frame_period > 0 )
 699     {
 700         p_dec->fmt_out.video.i_frame_rate =
 701             (uint32_t)( (uint64_t)1001000000 * 27 /
 702                         p_sys->p_info->sequence->frame_period );
 703         p_dec->fmt_out.video.i_frame_rate_base = 1001;
 704     }
 705
 706     p_dec->fmt_out.i_codec =
 707         ( p_sys->p_info->sequence->chroma_height <
 708           p_sys->p_info->sequence->height ) ?
 709         VLC_CODEC_I420 : VLC_CODEC_I422;
 710
 711 #if 0
 712     p_sys->f_wd_nb = fopen("/vlc/dec_nb", "w");
 713     if (p_sys->f_wd_nb != NULL)
 714     {
 715 //      fprintf(p_sys->f_wd_nb, "%d\n", mdate());
 716         fprintf(p_sys->f_wd_nb, "%s\n", mdate());
 717         fflush(p_sys->f_wd_nb);
 718     }
 719 #endif
 720     p_pic = decoder_NewPicture( p_dec );
 721
 722     if( p_pic == NULL ) return NULL;
 723
 724     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
 725         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
 726     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
 727         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
 728     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
 729         p_sys->p_info->current_picture->nb_fields : 2;
 730     p_pic->format.i_frame_rate = p_dec->fmt_out.video.i_frame_rate;
 731     p_pic->format.i_frame_rate_base = p_dec->fmt_out.video.i_frame_rate_base;
 732
 733     decoder_LinkPicture( p_dec, p_pic );
 734
 735     pp_buf[0] = p_pic->p[0].p_pixels;
 736     pp_buf[1] = p_pic->p[1].p_pixels;
 737     pp_buf[2] = p_pic->p[2].p_pixels;
 738
 739     /* let driver ensure this image has the right format */
 740 #if 0
 741     this->driver->update_frame_format( p_pic->p_sys->p_vout, p_pic,
 742                                        p_dec->fmt_out.video.i_width,
 743                                        p_dec->fmt_out.video.i_height,
 744                                        p_dec->fmt_out.video.i_aspect,
 745                                        format, flags);
 746     mpeg2_xxmc_choose_coding( p_dec, &p_sys->p_mpeg2dec->decoder, p_pic,
 747                               get_aspect_ratio(p_dec), 0 );
 748 #endif
 749     return p_pic;
 750 }