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 #if 0
 224 static void WriteDecodeFile(int value)
 225 {
 226     FILE *f_wd_ok;
 227
 228     f_wd_ok = fopen("/vlc/dec_ok", "w");
 229     if (f_wd_ok != NULL)
 230     {
 231         fprintf(f_wd_ok, "%d", value);
 232         fflush(f_wd_ok);
 233         fclose(f_wd_ok);
 234     }
 235 }
 236 #endif
 237
 238 /*****************************************************************************
 239  * RunDecoder: the libmpeg2 decoder
 240  *****************************************************************************/
 241 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 242 {
 243     decoder_sys_t   *p_sys = p_dec->p_sys;
 244     mpeg2_state_t   state;
 245     picture_t       *p_pic;
 246
 247     block_t *p_block;
 248
 249     if( !pp_block || !*pp_block )
 250         return NULL;
 251
 252     p_block = *pp_block;
 253     while( 1 )
 254     {
 255         state = mpeg2_parse( p_sys->p_mpeg2dec );
 256         switch( state )
 257         {
 258             case STATE_BUFFER:
 259                 if( !p_block->i_buffer )
 260                 {
 261                     block_Release( p_block );
 262                     return NULL;
 263                 }
 264                 if( (p_block->i_flags&BLOCK_FLAG_DISCONTINUITY) &&
 265                     p_sys->p_synchro &&
 266                     p_sys->p_info->sequence &&
 267                     p_sys->p_info->sequence->width != (unsigned int)-1 )
 268                 {
 269                     decoder_SynchroReset( p_sys->p_synchro );
 270                     if( p_sys->p_info->current_fbuf != NULL
 271                         && p_sys->p_info->current_fbuf->id != NULL )
 272                     {
 273                         p_sys->b_garbage_pic = 1;
 274                         p_pic = p_sys->p_info->current_fbuf->id;
 275                     }
 276                     else
 277                     {
 278                         uint8_t *buf[3];
 279                         buf[0] = buf[1] = buf[2] = NULL;
 280                         if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 281                             break;
 282                         mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 283                     }
 284                     p_sys->p_picture_to_destroy = p_pic;
 285
 286                     if ( p_sys->b_slice_i )
 287                     {
 288                         decoder_SynchroNewPicture( p_sys->p_synchro,
 289                             I_CODING_TYPE, 2, 0, 0,
 290                             p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 291                         decoder_SynchroDecode( p_sys->p_synchro );
 292                         decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 293                     }
 294                 }
 295
 296 #ifdef PIC_FLAG_PTS
 297                 if( p_block->i_pts )
 298                 {
 299                     mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 300
 301 #else /* New interface */
 302                 if( p_block->i_pts || p_block->i_dts )
 303                 {
 304                     mpeg2_tag_picture( p_sys->p_mpeg2dec,
 305                                         (uint32_t)p_block->i_pts,
 306                                         (uint32_t)p_block->i_dts );
 307 #endif
 308                     p_sys->i_previous_pts = p_sys->i_current_pts;
 309                     p_sys->i_current_pts = p_block->i_pts;
 310                     p_sys->i_previous_dts = p_sys->i_current_dts;
 311                     p_sys->i_current_dts = p_block->i_dts;
 312                 }
 313                 p_sys->i_current_rate = p_block->i_rate;
 314
 315                 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 316                                 p_block->p_buffer + p_block->i_buffer );
 317                 p_block->i_buffer = 0;
 318                 break;
 319
 320             case STATE_SEQUENCE:
 321             {
 322                 /* Initialize video output */
 323                 uint8_t *buf[3];
 324                 buf[0] = buf[1] = buf[2] = NULL;
 325
 326                 /* Check whether the input gave a particular aspect ratio */
 327                 if( p_dec->fmt_in.video.i_aspect )
 328                 {
 329                     p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
 330                     if( p_sys->i_aspect <= AR_221_1_PICTURE )
 331                     switch( p_sys->i_aspect )
 332                     {
 333                     case AR_3_4_PICTURE:
 334                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 335                         break;
 336                     case AR_16_9_PICTURE:
 337                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
 338                         break;
 339                     case AR_221_1_PICTURE:
 340                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
 341                         break;
 342                     case AR_SQUARE_PICTURE:
 343                         p_sys->i_aspect = VOUT_ASPECT_FACTOR *
 344                                     p_sys->p_info->sequence->width /
 345                                     p_sys->p_info->sequence->height;
 346                         break;
 347                     }
 348                 }
 349                 else
 350                 {
 351                     /* Use the value provided in the MPEG sequence header */
 352                     if( p_sys->p_info->sequence->pixel_height > 0 )
 353                     {
 354                         p_sys->i_aspect =
 355                             ((uint64_t)p_sys->p_info->sequence->display_width) *
 356                             p_sys->p_info->sequence->pixel_width *
 357                             VOUT_ASPECT_FACTOR /
 358                             p_sys->p_info->sequence->display_height /
 359                             p_sys->p_info->sequence->pixel_height;
 360                     }
 361                     else
 362                     {
 363                         /* Invalid aspect, assume 4:3.
 364                         * This shouldn't happen and if it does it is a bug
 365                         * in libmpeg2 (likely triggered by an invalid stream) */
 366                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 367                     }
 368                 }
 369
 370                 msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
 371                         p_sys->p_info->sequence->width,
 372                         p_sys->p_info->sequence->height, p_sys->i_aspect,
 373                         (uint32_t)((uint64_t)1001000000 * 27 /
 374                             p_sys->p_info->sequence->frame_period / 1001),
 375                         (uint32_t)((uint64_t)1001000000 * 27 /
 376                             p_sys->p_info->sequence->frame_period % 1001) );
 377
 378                 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 379
 380                 /* Set the first 2 reference frames */
 381                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 382
 383                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 384                 {
 385                     block_Release( p_block );
 386                     return NULL;
 387                 }
 388                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 389
 390                 p_pic->date = 0;
 391                 decoder_LinkPicture( p_dec, p_pic );
 392
 393                 if( p_sys->p_synchro )
 394                 {
 395                     decoder_SynchroRelease( p_sys->p_synchro );
 396                 }
 397                 p_sys->p_synchro = decoder_SynchroInit( p_dec,
 398                     (uint32_t)((uint64_t)1001000000 * 27 /
 399                     p_sys->p_info->sequence->frame_period) );
 400                 p_sys->b_after_sequence_header = 1;
 401             }
 402             break;
 403
 404             case STATE_PICTURE_2ND:
 405                 decoder_SynchroNewPicture( p_sys->p_synchro,
 406                         p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 407                         p_sys->p_info->current_picture->nb_fields,
 408                         0, 0,
 409                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 410
 411                 if( p_sys->b_skip )
 412                 {
 413                     decoder_SynchroTrash( p_sys->p_synchro );
 414                 }
 415                 else
 416                 {
 417                     decoder_SynchroDecode( p_sys->p_synchro );
 418                 }
 419                 break;
 420
 421             case STATE_PICTURE:
 422             {
 423                 uint8_t *buf[3];
 424                 mtime_t i_pts;
 425                 buf[0] = buf[1] = buf[2] = NULL;
 426
 427                 if ( p_sys->b_after_sequence_header &&
 428                     ((p_sys->p_info->current_picture->flags &
 429                         PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
 430                 {
 431                     /* Intra-slice refresh. Simulate a blank I picture. */
 432                     msg_Dbg( p_dec, "intra-slice refresh stream" );
 433                     decoder_SynchroNewPicture( p_sys->p_synchro,
 434                         I_CODING_TYPE, 2, 0, 0,
 435                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 436                     decoder_SynchroDecode( p_sys->p_synchro );
 437                     decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 438                     p_sys->b_slice_i = 1;
 439                 }
 440                 p_sys->b_after_sequence_header = 0;
 441
 442 #ifdef PIC_FLAG_PTS
 443                 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
 444                     ( ( p_sys->p_info->current_picture->pts ==
 445                         (uint32_t)p_sys->i_current_pts ) ?
 446                     p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 447 #else /* New interface */
 448                 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
 449                     ( ( p_sys->p_info->current_picture->tag ==
 450                         (uint32_t)p_sys->i_current_pts ) ?
 451                     p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 452 #endif
 453                 /* Hack to handle demuxers which only have DTS timestamps */
 454                 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
 455                 {
 456                     if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
 457                         (p_sys->p_info->current_picture->flags &
 458                         PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 459                     {
 460                         i_pts = p_block->i_dts;
 461                     }
 462                 }
 463                 p_block->i_pts = p_block->i_dts = 0;
 464                 /* End hack */
 465
 466                 decoder_SynchroNewPicture( p_sys->p_synchro,
 467                     p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 468                     p_sys->p_info->current_picture->nb_fields, i_pts,
 469                     0,
 470                     p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 471
 472                 if ( !(p_sys->b_slice_i
 473                     && ((p_sys->p_info->current_picture->flags
 474                             & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
 475                     && !decoder_SynchroChoose( p_sys->p_synchro,
 476                                 p_sys->p_info->current_picture->flags
 477                                     & PIC_MASK_CODING_TYPE,
 478                                 /*FindVout(p_dec)->render_time*/ 0 /*FIXME*/,
 479                                 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
 480                 {
 481                     mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 482                     p_sys->b_skip = 1;
 483                     decoder_SynchroTrash( p_sys->p_synchro );
 484                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 485                 }
 486                 else
 487                 {
 488                     mpeg2_skip( p_sys->p_mpeg2dec, 0 );
 489                     p_sys->b_skip = 0;
 490                     decoder_SynchroDecode( p_sys->p_synchro );
 491
 492                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 493                     {
 494                         block_Release( p_block );
 495                         return NULL;
 496                     }
 497
 498                     //p_sys->p_mpeg2dec->ptr_forward_ref_picture = p_sys->p_mpeg2dec->fbuf[2]->id;
 499                     //p_sys->p_mpeg2dec->ptr_backward_ref_picture = p_sys->p_mpeg2dec->fbuf[1]->id;
 500
 501                     if ((p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE) != B_CODING_TYPE)
 502                     {
 503                         //if (p_sys->p_mpeg2dec->ptr_forward_ref_picture &&
 504                         //    p_sys->p_mpeg2dec->ptr_forward_ref_picture != picture->backward_reference_frame)
 505                         //    p_pic->forward_reference_frame->free (p_pic->forward_reference_frame);
 506
 507                         //p_sys->p_mpeg2dec->ptr_forward_ref_picture =
 508                         //            p_sys->p_mpeg2dec->ptr_backward_ref_picture;
 509                         //p_sys->p_mpeg2dec->ptr_backward_ref_picture = (void *)p_pic;
 510                     }
 511                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 512                 }
 513             }
 514             break;
 515
 516             case STATE_END:
 517             case STATE_SLICE:
 518                 p_pic = NULL;
 519                 if( p_sys->p_info->display_fbuf
 520                     && p_sys->p_info->display_fbuf->id )
 521                 {
 522                     p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
 523
 524                     decoder_SynchroEnd( p_sys->p_synchro,
 525                                 p_sys->p_info->display_picture->flags
 526                                 & PIC_MASK_CODING_TYPE,
 527                                 p_sys->b_garbage_pic );
 528                     p_sys->b_garbage_pic = 0;
 529
 530                     if ( p_sys->p_picture_to_destroy != p_pic )
 531                     {
 532                         p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
 533                     }
 534                     else
 535                     {
 536                         p_sys->p_picture_to_destroy = NULL;
 537                         p_pic->date = 0;
 538                     }
 539                 }
 540
 541                 if( p_sys->p_info->discard_fbuf &&
 542                     p_sys->p_info->discard_fbuf->id )
 543                 {
 544                     decoder_UnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
 545                 }
 546                 /* For still frames */
 547                 //if( state == STATE_END && p_pic ) p_pic->b_force = true;
 548
 549                 if( p_pic )
 550                 {
 551 #if 0
 552                     /* Avoid frames with identical timestamps.
 553                      * Especially needed for still frames in DVD menus. */
 554                      if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
 555                         p_sys->i_last_frame_pts = p_pic->date;
 556 #endif
 557                     return p_pic;
 558                 }
 559                 break;
 560
 561             case STATE_INVALID:
 562             {
 563                 uint8_t *buf[3];
 564                 buf[0] = buf[1] = buf[2] = NULL;
 565
 566                 msg_Warn( p_dec, "invalid picture encountered" );
 567                 if ( ( p_sys->p_info->current_picture == NULL ) ||
 568                 ( ( p_sys->p_info->current_picture->flags &
 569                     PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
 570                 {
 571                     if( p_sys->p_synchro ) decoder_SynchroReset( p_sys->p_synchro );
 572                 }
 573                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 574                 p_sys->b_skip = 1;
 575
 576                 if( p_sys->p_info->current_fbuf &&
 577                     p_sys->p_info->current_fbuf->id )
 578                 {
 579                     p_sys->b_garbage_pic = 1;
 580                     p_pic = p_sys->p_info->current_fbuf->id;
 581                 }
 582                 else if( !p_sys->p_info->sequence )
 583                 {
 584                     break;
 585                 }
 586                 else
 587                 {
 588                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 589                         break;
 590                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 591                 }
 592                 p_sys->p_picture_to_destroy = p_pic;
 593
 594                 memset( p_pic->p[0].p_pixels, 0,
 595                         p_sys->p_info->sequence->width
 596                         * p_sys->p_info->sequence->height );
 597                 memset( p_pic->p[1].p_pixels, 0x80,
 598                         p_sys->p_info->sequence->width
 599                         * p_sys->p_info->sequence->height / 4 );
 600                 memset( p_pic->p[2].p_pixels, 0x80,
 601                         p_sys->p_info->sequence->width
 602                         * p_sys->p_info->sequence->height / 4 );
 603
 604                 if( p_sys->b_slice_i )
 605                 {
 606                     decoder_SynchroNewPicture( p_sys->p_synchro,
 607                         I_CODING_TYPE, 2, 0, 0,
 608                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 609                     decoder_SynchroDecode( p_sys->p_synchro );
 610                     decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 611                 }
 612                 break;
 613             }
 614
 615             default:
 616                 break;
 617         }
 618     }
 619     return NULL;
 620 }
 621
 622 /*****************************************************************************
 623  * CloseDecoder: libmpeg2 decoder destruction
 624  *****************************************************************************/
 625 static void CloseDecoder( vlc_object_t *p_this )
 626 {
 627     decoder_t *p_dec = (decoder_t *)p_this;
 628     decoder_sys_t *p_sys = p_dec->p_sys;
 629     FILE *f_wd_dec;
 630
 631     if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
 632     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 633
 634     f_wd_dec = fopen("/vlc/dec_pid", "w");
 635     if (f_wd_dec != NULL)
 636     {
 637         fprintf(f_wd_dec, "0\n");
 638         fflush(f_wd_dec);
 639         fclose(f_wd_dec);
 640     }
 641     free( p_sys );
 642 }
 643
 644 #if 0
 645 static double get_aspect_ratio( decoder_t *p_dec )
 646 {
 647     decoder_sys_t *p_sys = p_dec->p_sys;
 648     double ratio;
 649     double mpeg1_pel_ratio[16] = {1.0 /* forbidden */,
 650         1.0, 0.6735, 0.7031, 0.7615, 0.8055, 0.8437, 0.8935, 0.9157,
 651         0.9815, 1.0255, 1.0695, 1.0950, 1.1575, 1.2015, 1.0 /*reserved*/ };
 652
 653     if( !p_sys->p_mpeg2dec->decoder.mpeg1 )
 654     {
 655         /* these hardcoded values are defined on mpeg2 standard for
 656         * aspect ratio. other values are reserved or forbidden.  */
 657         /*switch( p_sys->p_mpeg2dec->decoder.aspect_ratio_information )
 658         {
 659             case 2:
 660                 ratio = 4.0/3.0;
 661                 break;
 662             case 3:
 663                 ratio = 16.0/9.0;
 664                 break;
 665             case 4:
 666                 ratio = 2.11/1.0;
 667                 break;
 668             case 1:
 669                 default:*/
 670                 ratio = (double)p_sys->p_mpeg2dec->decoder.width/(double)p_sys->p_mpeg2dec->decoder.height;
 671         /*    break;
 672         }*/
 673     }
 674     else
 675     {
 676         /* mpeg1 constants refer to pixel aspect ratio */
 677         ratio = (double)p_sys->p_mpeg2dec->decoder.width/(double)p_sys->p_mpeg2dec->decoder.height;
 678         /* ratio /= mpeg1_pel_ratio[p_sys->p_mpeg2dec->decoder.aspect_ratio_information]; */
 679     }
 680     return ratio;
 681 }
 682 #endif
 683
 684 /*****************************************************************************
 685  * GetNewPicture: Get a new picture from the vout and set the buf struct
 686  *****************************************************************************/
 687 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
 688 {
 689     //msg_Dbg(p_dec, "GetNewPicture Entering");
 690     decoder_sys_t *p_sys = p_dec->p_sys;
 691     picture_t *p_pic;
 692
 693     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
 694     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
 695     p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
 696
 697     if( p_sys->p_info->sequence->frame_period > 0 )
 698     {
 699         p_dec->fmt_out.video.i_frame_rate =
 700             (uint32_t)( (uint64_t)1001000000 * 27 /
 701                         p_sys->p_info->sequence->frame_period );
 702         p_dec->fmt_out.video.i_frame_rate_base = 1001;
 703     }
 704
 705     p_dec->fmt_out.i_codec =
 706         ( p_sys->p_info->sequence->chroma_height <
 707           p_sys->p_info->sequence->height ) ?
 708         VLC_CODEC_I420 : VLC_CODEC_I422;
 709
 710 #if 0
 711     p_sys->f_wd_nb = fopen("/vlc/dec_nb", "w");
 712     if (p_sys->f_wd_nb != NULL)
 713     {
 714 //      fprintf(p_sys->f_wd_nb, "%d\n", mdate());
 715         fprintf(p_sys->f_wd_nb, "%s\n", mdate());
 716         fflush(p_sys->f_wd_nb);
 717     }
 718 #endif
 719     p_pic = decoder_NewPicture( p_dec );
 720
 721     if( p_pic == NULL ) return NULL;
 722
 723     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
 724         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
 725     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
 726         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
 727     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
 728         p_sys->p_info->current_picture->nb_fields : 2;
 729     p_pic->format.i_frame_rate = p_dec->fmt_out.video.i_frame_rate;
 730     p_pic->format.i_frame_rate_base = p_dec->fmt_out.video.i_frame_rate_base;
 731
 732     decoder_LinkPicture( p_dec, p_pic );
 733
 734     pp_buf[0] = p_pic->p[0].p_pixels;
 735     pp_buf[1] = p_pic->p[1].p_pixels;
 736     pp_buf[2] = p_pic->p[2].p_pixels;
 737
 738     /* let driver ensure this image has the right format */
 739 #if 0
 740     this->driver->update_frame_format( p_pic->p_sys->p_vout, p_pic,
 741                                        p_dec->fmt_out.video.i_width,
 742                                        p_dec->fmt_out.video.i_height,
 743                                        p_dec->fmt_out.video.i_aspect,
 744                                        format, flags);
 745     mpeg2_xxmc_choose_coding( p_dec, &p_sys->p_mpeg2dec->decoder, p_pic,
 746                               get_aspect_ratio(p_dec), 0 );
 747 #endif
 748     return p_pic;
 749 }