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