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 #include <vlc/vlc.h>
  29 #include <vlc_vout.h>
  30 #include <vlc_codec.h>
  31
  32 #include <mcheck.h>
  33
  34 #include "mpeg2.h"
  35 #include "attributes.h"
  36 #include "mpeg2_internal.h"
  37 #include "xvmc_vld.h"
  38
  39 #include "vout_synchro.h"
  40
  41 /* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */
  42 #define AR_SQUARE_PICTURE       1                           /* square pixels */
  43 #define AR_3_4_PICTURE          2                        /* 3:4 picture (TV) */
  44 #define AR_16_9_PICTURE         3              /* 16:9 picture (wide screen) */
  45 #define AR_221_1_PICTURE        4                  /* 2.21:1 picture (movie) */
  46
  47 #include <unistd.h>
  48 /*****************************************************************************
  49  * decoder_sys_t : libmpeg2 decoder descriptor
  50  *****************************************************************************/
  51 struct decoder_sys_t
  52 {
  53     /*
  54      * libmpeg2 properties
  55      */
  56     mpeg2dec_t          *p_mpeg2dec;
  57     const mpeg2_info_t  *p_info;
  58     vlc_bool_t          b_skip;
  59
  60     /*
  61      * Input properties
  62      */
  63     pes_packet_t     *p_pes;                  /* current PES we are decoding */
  64     mtime_t          i_pts;
  65     mtime_t          i_previous_pts;
  66     mtime_t          i_current_pts;
  67     mtime_t          i_previous_dts;
  68     mtime_t          i_current_dts;
  69     int              i_current_rate;
  70     picture_t *      p_picture_to_destroy;
  71     vlc_bool_t       b_garbage_pic;
  72     vlc_bool_t       b_after_sequence_header; /* is it the next frame after
  73                                                * the sequence header ?    */
  74     vlc_bool_t       b_slice_i;             /* intra-slice refresh stream */
  75
  76     /*
  77      * Output properties
  78      */
  79     vout_synchro_t *p_synchro;
  80     int i_aspect;
  81     mtime_t        i_last_frame_pts;
  82
  83 };
  84
  85 /*****************************************************************************
  86  * Local prototypes
  87  *****************************************************************************/
  88
  89 static int  OpenDecoder( vlc_object_t * );
  90 static void CloseDecoder( vlc_object_t * );
  91
  92 static picture_t *DecodeBlock( decoder_t *, block_t ** );
  93
  94 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
  95
  96 /*****************************************************************************
  97  * Module descriptor
  98  *****************************************************************************/
  99 vlc_module_begin();
 100     set_description( _("MPEG I/II hw video decoder (using libmpeg2)") );
 101     set_capability( "decoder", 160 );
 102     set_callbacks( OpenDecoder, CloseDecoder );
 103     add_shortcut( "xxmc" );
 104 vlc_module_end();
 105
 106 /*****************************************************************************
 107  * OpenDecoder: probe the decoder and return score
 108  *****************************************************************************/
 109 static int OpenDecoder( vlc_object_t *p_this )
 110 {
 111
 112     decoder_t *p_dec = (decoder_t*)p_this;
 113     decoder_sys_t *p_sys;
 114     uint32_t i_accel = 0;
 115     FILE *f_wd_dec;
 116
 117     msg_Dbg(p_dec, "OpenDecoder Entering");
 118     mtrace();
 119     if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
 120         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
 121         /* Pinnacle hardware-mpeg1 */
 122         p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
 123         /* VIA hardware-mpeg2 */
 124         p_dec->fmt_in.i_codec != VLC_FOURCC('X','x','M','C') &&
 125         /* ATI Video */
 126         p_dec->fmt_in.i_codec != VLC_FOURCC('V','C','R','2') &&
 127         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') )
 128     {
 129         return VLC_EGENERIC;
 130     }
 131
 132     /* Allocate the memory needed to store the decoder's structure */
 133     if( ( p_dec->p_sys = p_sys =
 134           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
 135     {
 136         msg_Err( p_dec, "out of memory" );
 137         return VLC_EGENERIC;
 138     }
 139
 140     /* Initialize the thread properties */
 141     memset( p_sys, 0, sizeof(decoder_sys_t) );
 142     p_sys->p_pes      = NULL;
 143     p_sys->p_mpeg2dec = NULL;
 144     p_sys->p_synchro  = NULL;
 145     p_sys->p_info     = NULL;
 146     p_sys->i_pts      = mdate() + DEFAULT_PTS_DELAY;
 147     p_sys->i_current_pts  = 0;
 148     p_sys->i_previous_pts = 0;
 149     p_sys->i_current_dts  = 0;
 150     p_sys->i_previous_dts = 0;
 151     p_sys->p_picture_to_destroy = NULL;
 152     p_sys->b_garbage_pic = 0;
 153     p_sys->b_slice_i  = 0;
 154     p_sys->b_skip     = 0;
 155
 156 #if defined( __i386__ )
 157     if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMX )
 158     {
 159         i_accel |= MPEG2_ACCEL_X86_MMX;
 160     }
 161
 162     if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_3DNOW )
 163     {
 164         i_accel |= MPEG2_ACCEL_X86_3DNOW;
 165     }
 166
 167     if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMXEXT )
 168     {
 169         i_accel |= MPEG2_ACCEL_X86_MMXEXT;
 170     }
 171
 172 #elif defined( __powerpc__ ) || defined( SYS_DARWIN )
 173     if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_ALTIVEC )
 174     {
 175         i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
 176     }
 177
 178 #else
 179     /* If we do not know this CPU, trust libmpeg2's feature detection */
 180     i_accel = MPEG2_ACCEL_DETECT;
 181
 182 #endif
 183
 184     /* Set CPU acceleration features */
 185     mpeg2_accel( i_accel );
 186
 187     /* Initialize decoder */
 188     p_sys->p_mpeg2dec = mpeg2_init();
 189     if( p_sys->p_mpeg2dec == NULL)
 190     {
 191         msg_Err( p_dec, "mpeg2_init() failed" );
 192         free( p_sys );
 193         return VLC_EGENERIC;
 194     }
 195
 196     p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
 197
 198     p_dec->pf_decode_video = DecodeBlock;
 199
 200     f_wd_dec = fopen("/vlc/dec_pid", "w");
 201
 202     if (f_wd_dec != NULL)
 203     {
 204         fprintf(f_wd_dec, "%d\n", getpid());
 205         fflush(f_wd_dec);
 206         fclose(f_wd_dec);
 207     }
 208
 209     msg_Dbg(p_dec, "OpenDecoder Leaving");
 210     return VLC_SUCCESS;
 211 }
 212
 213 static void WriteDecodeFile(int value)
 214 {
 215     FILE *f_wd_ok;
 216
 217     f_wd_ok = fopen("/vlc/dec_ok", "w");
 218     if (f_wd_ok != NULL)
 219     {
 220         fprintf(f_wd_ok, "%d", value);
 221         fflush(f_wd_ok);
 222         fclose(f_wd_ok);
 223     }
 224 }
 225
 226 /*****************************************************************************
 227  * RunDecoder: the libmpeg2 decoder
 228  *****************************************************************************/
 229 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 230 {
 231     decoder_sys_t   *p_sys = p_dec->p_sys;
 232     mpeg2_state_t   state;
 233     picture_t       *p_pic;
 234
 235     block_t *p_block;
 236
 237     if( !pp_block || !*pp_block )
 238         return NULL;
 239
 240     p_block = *pp_block;
 241     while( 1 )
 242     {
 243         state = mpeg2_parse( p_sys->p_mpeg2dec );
 244         switch( state )
 245         {
 246             case STATE_BUFFER:
 247                 if( !p_block->i_buffer )
 248                 {
 249                     block_Release( p_block );
 250                     return NULL;
 251                 }
 252                 if( (p_block->i_flags&BLOCK_FLAG_DISCONTINUITY) &&
 253                     p_sys->p_synchro &&
 254                     p_sys->p_info->sequence &&
 255                     p_sys->p_info->sequence->width != (unsigned int)-1 )
 256                 {
 257                     vout_SynchroReset( p_sys->p_synchro );
 258                     if( p_sys->p_info->current_fbuf != NULL
 259                         && p_sys->p_info->current_fbuf->id != NULL )
 260                     {
 261                         p_sys->b_garbage_pic = 1;
 262                         p_pic = p_sys->p_info->current_fbuf->id;
 263                     }
 264                     else
 265                     {
 266                         uint8_t *buf[3];
 267                         buf[0] = buf[1] = buf[2] = NULL;
 268                         if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 269                             break;
 270                         mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 271                     }
 272                     p_sys->p_picture_to_destroy = p_pic;
 273
 274                     if ( p_sys->b_slice_i )
 275                     {
 276                         vout_SynchroNewPicture( p_sys->p_synchro,
 277                             I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 278                         vout_SynchroDecode( p_sys->p_synchro );
 279                         vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 280                     }
 281                 }
 282
 283 #ifdef PIC_FLAG_PTS
 284                 if( p_block->i_pts )
 285                 {
 286                     mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 287
 288 #else /* New interface */
 289                 if( p_block->i_pts || p_block->i_dts )
 290                 {
 291                     mpeg2_tag_picture( p_sys->p_mpeg2dec,
 292                                         (uint32_t)p_block->i_pts,
 293                                         (uint32_t)p_block->i_dts );
 294 #endif
 295                     p_sys->i_previous_pts = p_sys->i_current_pts;
 296                     p_sys->i_current_pts = p_block->i_pts;
 297                     p_sys->i_previous_dts = p_sys->i_current_dts;
 298                     p_sys->i_current_dts = p_block->i_dts;
 299                 }
 300                 p_sys->i_current_rate = p_block->i_rate;
 301
 302                 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 303                                 p_block->p_buffer + p_block->i_buffer );
 304                 p_block->i_buffer = 0;
 305                 break;
 306
 307             case STATE_SEQUENCE:
 308             {
 309                 /* Initialize video output */
 310                 uint8_t *buf[3];
 311                 buf[0] = buf[1] = buf[2] = NULL;
 312
 313                 /* Check whether the input gave a particular aspect ratio */
 314                 if( p_dec->fmt_in.video.i_aspect )
 315                 {
 316                     p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
 317                     if( p_sys->i_aspect <= AR_221_1_PICTURE )
 318                     switch( p_sys->i_aspect )
 319                     {
 320                     case AR_3_4_PICTURE:
 321                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 322                         break;
 323                     case AR_16_9_PICTURE:
 324                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
 325                         break;
 326                     case AR_221_1_PICTURE:
 327                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
 328                         break;
 329                     case AR_SQUARE_PICTURE:
 330                         p_sys->i_aspect = VOUT_ASPECT_FACTOR *
 331                                     p_sys->p_info->sequence->width /
 332                                     p_sys->p_info->sequence->height;
 333                         break;
 334                     }
 335                 }
 336                 else
 337                 {
 338                     /* Use the value provided in the MPEG sequence header */
 339                     if( p_sys->p_info->sequence->pixel_height > 0 )
 340                     {
 341                         p_sys->i_aspect =
 342                             ((uint64_t)p_sys->p_info->sequence->display_width) *
 343                             p_sys->p_info->sequence->pixel_width *
 344                             VOUT_ASPECT_FACTOR /
 345                             p_sys->p_info->sequence->display_height /
 346                             p_sys->p_info->sequence->pixel_height;
 347                     }
 348                     else
 349                     {
 350                         /* Invalid aspect, assume 4:3.
 351                         * This shouldn't happen and if it does it is a bug
 352                         * in libmpeg2 (likely triggered by an invalid stream) */
 353                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 354                     }
 355                 }
 356
 357                 msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
 358                         p_sys->p_info->sequence->width,
 359                         p_sys->p_info->sequence->height, p_sys->i_aspect,
 360                         (uint32_t)((uint64_t)1001000000 * 27 /
 361                             p_sys->p_info->sequence->frame_period / 1001),
 362                         (uint32_t)((uint64_t)1001000000 * 27 /
 363                             p_sys->p_info->sequence->frame_period % 1001) );
 364
 365                 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 366
 367                 /* Set the first 2 reference frames */
 368                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 369
 370                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 371                 {
 372                     block_Release( p_block );
 373                     return NULL;
 374                 }
 375                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 376
 377                 p_pic->date = 0;
 378                 p_dec->pf_picture_link( p_dec, p_pic );
 379
 380                 if( p_sys->p_synchro )
 381                 {
 382                     vout_SynchroRelease( p_sys->p_synchro );
 383                 }
 384                 p_sys->p_synchro = vout_SynchroInit( p_dec,
 385                     (uint32_t)((uint64_t)1001000000 * 27 /
 386                     p_sys->p_info->sequence->frame_period) );
 387                 p_sys->b_after_sequence_header = 1;
 388             }
 389             break;
 390
 391             case STATE_PICTURE_2ND:
 392                 vout_SynchroNewPicture( p_sys->p_synchro,
 393                         p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 394                         p_sys->p_info->current_picture->nb_fields,
 395                         0, 0, p_sys->i_current_rate );
 396
 397                 if( p_sys->b_skip )
 398                 {
 399                     vout_SynchroTrash( p_sys->p_synchro );
 400                 }
 401                 else
 402                 {
 403                     vout_SynchroDecode( p_sys->p_synchro );
 404                 }
 405                 break;
 406
 407             case STATE_PICTURE:
 408             {
 409                 uint8_t *buf[3];
 410                 mtime_t i_pts;
 411                 buf[0] = buf[1] = buf[2] = NULL;
 412
 413                 if ( p_sys->b_after_sequence_header &&
 414                     ((p_sys->p_info->current_picture->flags &
 415                         PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
 416                 {
 417                     /* Intra-slice refresh. Simulate a blank I picture. */
 418                     msg_Dbg( p_dec, "intra-slice refresh stream" );
 419                     vout_SynchroNewPicture( p_sys->p_synchro,
 420                         I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 421                     vout_SynchroDecode( p_sys->p_synchro );
 422                     vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 423                     p_sys->b_slice_i = 1;
 424                 }
 425                 p_sys->b_after_sequence_header = 0;
 426
 427 #ifdef PIC_FLAG_PTS
 428                 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
 429                     ( ( p_sys->p_info->current_picture->pts ==
 430                         (uint32_t)p_sys->i_current_pts ) ?
 431                     p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 432 #else /* New interface */
 433                 i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
 434                     ( ( p_sys->p_info->current_picture->tag ==
 435                         (uint32_t)p_sys->i_current_pts ) ?
 436                     p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 437 #endif
 438                 /* Hack to handle demuxers which only have DTS timestamps */
 439                 if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
 440                 {
 441                     if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
 442                         (p_sys->p_info->current_picture->flags &
 443                         PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 444                     {
 445                         i_pts = p_block->i_dts;
 446                     }
 447                 }
 448                 p_block->i_pts = p_block->i_dts = 0;
 449                 /* End hack */
 450
 451                 vout_SynchroNewPicture( p_sys->p_synchro,
 452                     p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 453                     p_sys->p_info->current_picture->nb_fields, i_pts,
 454                     0, p_sys->i_current_rate );
 455
 456                 if ( !(p_sys->b_slice_i
 457                     && ((p_sys->p_info->current_picture->flags
 458                             & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
 459                     && !vout_SynchroChoose( p_sys->p_synchro,
 460                                 p_sys->p_info->current_picture->flags
 461                                     & PIC_MASK_CODING_TYPE,
 462                                 /*FindVout(p_dec)->render_time*/ 0 /*FIXME*/ ) )
 463                 {
 464                     mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 465                     p_sys->b_skip = 1;
 466                     vout_SynchroTrash( p_sys->p_synchro );
 467                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 468                 }
 469                 else
 470                 {
 471                     mpeg2_skip( p_sys->p_mpeg2dec, 0 );
 472                     p_sys->b_skip = 0;
 473                     vout_SynchroDecode( p_sys->p_synchro );
 474
 475                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 476                     {
 477                         block_Release( p_block );
 478                         return NULL;
 479                     }
 480
 481                     p_sys->p_mpeg2dec->ptr_forward_ref_picture = p_sys->p_mpeg2dec->fbuf[2]->id;
 482                     p_sys->p_mpeg2dec->ptr_backward_ref_picture = p_sys->p_mpeg2dec->fbuf[1]->id;
 483
 484                     if ((p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE) != B_CODING_TYPE)
 485                     {
 486                         //if (p_sys->p_mpeg2dec->ptr_forward_ref_picture &&
 487                         //    p_sys->p_mpeg2dec->ptr_forward_ref_picture != picture->backward_reference_frame)
 488                         //    p_pic->forward_reference_frame->free (p_pic->forward_reference_frame);
 489
 490                         p_sys->p_mpeg2dec->ptr_forward_ref_picture =
 491                                     p_sys->p_mpeg2dec->ptr_backward_ref_picture;
 492                         p_sys->p_mpeg2dec->ptr_backward_ref_picture = (void *)p_pic;
 493                     }
 494                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 495                 }
 496             }
 497             break;
 498
 499             case STATE_END:
 500             case STATE_SLICE:
 501                 p_pic = NULL;
 502                 if( p_sys->p_info->display_fbuf
 503                     && p_sys->p_info->display_fbuf->id )
 504                 {
 505                     p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
 506
 507                     vout_SynchroEnd( p_sys->p_synchro,
 508                                 p_sys->p_info->display_picture->flags
 509                                 & PIC_MASK_CODING_TYPE,
 510                                 p_sys->b_garbage_pic );
 511                     p_sys->b_garbage_pic = 0;
 512
 513                     if ( p_sys->p_picture_to_destroy != p_pic )
 514                     {
 515                         p_pic->date = vout_SynchroDate( p_sys->p_synchro );
 516                     }
 517                     else
 518                     {
 519                         p_sys->p_picture_to_destroy = NULL;
 520                         p_pic->date = 0;
 521                     }
 522                 }
 523
 524                 if( p_sys->p_info->discard_fbuf &&
 525                     p_sys->p_info->discard_fbuf->id )
 526                 {
 527                     p_dec->pf_picture_unlink( p_dec, p_sys->p_info->discard_fbuf->id );
 528                 }
 529                 /* For still frames */
 530                 //if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;
 531
 532                 if( p_pic )
 533                 {
 534 #if 0
 535                     /* Avoid frames with identical timestamps.
 536                      * Especially needed for still frames in DVD menus. */
 537                      if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
 538                         p_sys->i_last_frame_pts = p_pic->date;
 539 #endif
 540                     return p_pic;
 541                 }
 542                 break;
 543
 544             case STATE_INVALID:
 545             {
 546                 uint8_t *buf[3];
 547                 buf[0] = buf[1] = buf[2] = NULL;
 548
 549                 msg_Warn( p_dec, "invalid picture encountered" );
 550                 if ( ( p_sys->p_info->current_picture == NULL ) ||
 551                 ( ( p_sys->p_info->current_picture->flags &
 552                     PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
 553                 {
 554                     if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
 555                 }
 556                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 557                 p_sys->b_skip = 1;
 558
 559                 if( p_sys->p_info->current_fbuf &&
 560                     p_sys->p_info->current_fbuf->id )
 561                 {
 562                     p_sys->b_garbage_pic = 1;
 563                     p_pic = p_sys->p_info->current_fbuf->id;
 564                 }
 565                 else if( !p_sys->p_info->sequence )
 566                 {
 567                     break;
 568                 }
 569                 else
 570                 {
 571                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 572                         break;
 573                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 574                 }
 575                 p_sys->p_picture_to_destroy = p_pic;
 576
 577                 memset( p_pic->p[0].p_pixels, 0,
 578                         p_sys->p_info->sequence->width
 579                         * p_sys->p_info->sequence->height );
 580                 memset( p_pic->p[1].p_pixels, 0x80,
 581                         p_sys->p_info->sequence->width
 582                         * p_sys->p_info->sequence->height / 4 );
 583                 memset( p_pic->p[2].p_pixels, 0x80,
 584                         p_sys->p_info->sequence->width
 585                         * p_sys->p_info->sequence->height / 4 );
 586
 587                 if( p_sys->b_slice_i )
 588                 {
 589                     vout_SynchroNewPicture( p_sys->p_synchro,
 590                                 I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate );
 591                     vout_SynchroDecode( p_sys->p_synchro );
 592                     vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 593                 }
 594                 break;
 595             }
 596
 597             default:
 598                 break;
 599         }
 600     }
 601     return NULL;
 602 }
 603
 604 /*****************************************************************************
 605  * CloseDecoder: libmpeg2 decoder destruction
 606  *****************************************************************************/
 607 static void CloseDecoder( vlc_object_t *p_this )
 608 {
 609     decoder_t *p_dec = (decoder_t *)p_this;
 610     decoder_sys_t *p_sys = p_dec->p_sys;
 611     FILE *f_wd_dec;
 612
 613     if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
 614     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 615
 616     f_wd_dec = fopen("/vlc/dec_pid", "w");
 617     if (f_wd_dec != NULL)
 618     {
 619         fprintf(f_wd_dec, "0\n");
 620         fflush(f_wd_dec);
 621         fclose(f_wd_dec);
 622     }
 623     free( p_sys );
 624 }
 625
 626 static double get_aspect_ratio( decoder_t *p_dec )
 627 {
 628     decoder_sys_t *p_sys = p_dec->p_sys;
 629     double ratio;
 630     double mpeg1_pel_ratio[16] = {1.0 /* forbidden */,
 631         1.0, 0.6735, 0.7031, 0.7615, 0.8055, 0.8437, 0.8935, 0.9157,
 632         0.9815, 1.0255, 1.0695, 1.0950, 1.1575, 1.2015, 1.0 /*reserved*/ };
 633
 634     if( !p_sys->p_mpeg2dec->decoder.mpeg1 )
 635     {
 636         /* these hardcoded values are defined on mpeg2 standard for
 637         * aspect ratio. other values are reserved or forbidden.  */
 638         switch( p_sys->p_mpeg2dec->decoder.aspect_ratio_information )
 639         {
 640             case 2:
 641                 ratio = 4.0/3.0;
 642                 break;
 643             case 3:
 644                 ratio = 16.0/9.0;
 645                 break;
 646             case 4:
 647                 ratio = 2.11/1.0;
 648                 break;
 649             case 1:
 650                 default:
 651                 ratio = (double)p_sys->p_mpeg2dec->decoder.width/(double)p_sys->p_mpeg2dec->decoder.height;
 652             break;
 653         }
 654     }
 655     else
 656     {
 657         /* mpeg1 constants refer to pixel aspect ratio */
 658         ratio = (double)p_sys->p_mpeg2dec->decoder.width/(double)p_sys->p_mpeg2dec->decoder.height;
 659         ratio /= mpeg1_pel_ratio[p_sys->p_mpeg2dec->decoder.aspect_ratio_information];
 660     }
 661     return ratio;
 662 }
 663 /*****************************************************************************
 664  * GetNewPicture: Get a new picture from the vout and set the buf struct
 665  *****************************************************************************/
 666 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
 667 {
 668     //msg_Dbg(p_dec, "GetNewPicture Entering");
 669     decoder_sys_t *p_sys = p_dec->p_sys;
 670     picture_t *p_pic;
 671     static int nbpic = 0;
 672
 673     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
 674     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
 675     p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
 676
 677     if( p_sys->p_info->sequence->frame_period > 0 )
 678     {
 679         p_dec->fmt_out.video.i_frame_rate =
 680             (uint32_t)( (uint64_t)1001000000 * 27 /
 681                         p_sys->p_info->sequence->frame_period );
 682         p_dec->fmt_out.video.i_frame_rate_base = 1001;
 683     }
 684
 685     p_dec->fmt_out.i_codec =
 686         ( p_sys->p_info->sequence->chroma_height <
 687           p_sys->p_info->sequence->height ) ?
 688         VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
 689
 690 #if 0
 691     p_sys->f_wd_nb = fopen("/vlc/dec_nb", "w");
 692     if (p_sys->f_wd_nb != NULL)
 693     {
 694 //         fprintf(p_sys->f_wd_nb, "%d\n", mdate());
 695         fprintf(p_sys->f_wd_nb, "%s\n", mdate());
 696         fflush(p_sys->f_wd_nb);
 697     }
 698 #endif
 699     p_pic = p_dec->pf_vout_buffer_new( p_dec );
 700
 701     if( p_pic == NULL ) return NULL;
 702
 703     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
 704         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
 705     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
 706         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
 707     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
 708         p_sys->p_info->current_picture->nb_fields : 2;
 709     p_pic->format.i_frame_rate = p_dec->fmt_out.video.i_frame_rate;
 710     p_pic->format.i_frame_rate_base = p_dec->fmt_out.video.i_frame_rate_base;
 711
 712     p_dec->pf_picture_link( p_dec, p_pic );
 713
 714     pp_buf[0] = p_pic->p[0].p_pixels;
 715     pp_buf[1] = p_pic->p[1].p_pixels;
 716     pp_buf[2] = p_pic->p[2].p_pixels;
 717
 718     /* let driver ensure this image has the right format */
 719 #if 0
 720     this->driver->update_frame_format( p_pic->p_sys->p_vout, p_pic,
 721                                        p_dec->fmt_out.video.i_width,
 722                                        p_dec->fmt_out.video.i_height,
 723                                        p_dec->fmt_out.video.i_aspect,
 724                                        format, flags);
 725 #endif
 726     mpeg2_xxmc_choose_coding( p_dec, &p_sys->p_mpeg2dec->decoder, p_pic,
 727                               get_aspect_ratio(p_dec), 0 );
 728     return p_pic;
 729 }