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