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