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 #include <vlc_vout_synchro.h>
  32
  33 #include <unistd.h>
  34 #include <mcheck.h>
  35
  36 #include "mpeg2.h"
  37 #include "attributes.h"
  38 #include "mpeg2_internal.h"
  39 #include "xvmc_vld.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 /*****************************************************************************
  48  * decoder_sys_t : libmpeg2 decoder descriptor
  49  *****************************************************************************/
  50 struct decoder_sys_t
  51 {
  52     /*
  53      * libmpeg2 properties
  54      */
  55     mpeg2dec_t          *p_mpeg2dec;
  56     const mpeg2_info_t  *p_info;
  57     vlc_bool_t          b_skip;
  58
  59     /*
  60      * Input properties
  61      */
  62     mtime_t          i_pts;
  63     mtime_t          i_previous_pts;
  64     mtime_t          i_current_pts;
  65     mtime_t          i_previous_dts;
  66     mtime_t          i_current_dts;
  67     int              i_current_rate;
  68     picture_t *      p_picture_to_destroy;
  69     vlc_bool_t       b_garbage_pic;
  70     vlc_bool_t       b_after_sequence_header; /* is it the next frame after
  71                                                * the sequence header ?    */
  72     vlc_bool_t       b_slice_i;             /* intra-slice refresh stream */
  73
  74     /*
  75      * Output properties
  76      */
  77     vout_synchro_t *p_synchro;
  78     int            i_aspect;
  79     mtime_t        i_last_frame_pts;
  80
  81 };
  82
  83 /*****************************************************************************
  84  * Local prototypes
  85  *****************************************************************************/
  86
  87 static int  OpenDecoder( vlc_object_t * );
  88 static void CloseDecoder( vlc_object_t * );
  89
  90 static picture_t *DecodeBlock( decoder_t *, block_t ** );
  91
  92 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
  93
  94 /*****************************************************************************
  95  * Module descriptor
  96  *****************************************************************************/
  97 vlc_module_begin();
  98     set_description( _("MPEG I/II hw video decoder (using libmpeg2)") );
  99     set_capability( "decoder", 160 );
 100     set_callbacks( OpenDecoder, CloseDecoder );
 101     add_shortcut( "xxmc" );
 102 vlc_module_end();
 103
 104 /*****************************************************************************
 105  * OpenDecoder: probe the decoder and return score
 106  *****************************************************************************/
 107 static int OpenDecoder( vlc_object_t *p_this )
 108 {
 109
 110     decoder_t *p_dec = (decoder_t*)p_this;
 111     decoder_sys_t *p_sys = NULL;
 112     uint32_t i_accel = 0;
 113     FILE *f_wd_dec;
 114
 115     msg_Dbg(p_dec, "OpenDecoder Entering");
 116     mtrace();
 117     if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','v') &&
 118         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
 119         /* Pinnacle hardware-mpeg1 */
 120         p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
 121         /* VIA hardware-mpeg2 */
 122         p_dec->fmt_in.i_codec != VLC_FOURCC('X','x','M','C') &&
 123         /* ATI Video */
 124         p_dec->fmt_in.i_codec != VLC_FOURCC('V','C','R','2') &&
 125         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') )
 126     {
 127         return VLC_EGENERIC;
 128     }
 129
 130     /* Allocate the memory needed to store the decoder's structure */
 131     p_dec->p_sys = p_sys = (decoder_sys_t *)malloc(sizeof(decoder_sys_t));
 132     if( !p_sys )
 133     {
 134         msg_Err( p_dec, "out of memory" );
 135         return VLC_EGENERIC;
 136     }
 137
 138     /* Initialize the thread properties */
 139     memset( p_sys, 0, sizeof(decoder_sys_t) );
 140     p_sys->p_mpeg2dec = NULL;
 141     p_sys->p_synchro  = NULL;
 142     p_sys->p_info     = NULL;
 143     p_sys->i_pts      = mdate() + DEFAULT_PTS_DELAY;
 144     p_sys->i_current_pts  = 0;
 145     p_sys->i_previous_pts = 0;
 146     p_sys->i_current_dts  = 0;
 147     p_sys->i_previous_dts = 0;
 148     p_sys->p_picture_to_destroy = NULL;
 149     p_sys->b_garbage_pic = 0;
 150     p_sys->b_slice_i  = 0;
 151     p_sys->b_skip     = 0;
 152
 153 #if defined( __i386__ )
 154     if( vlc_CPU() & CPU_CAPABILITY_MMX )
 155     {
 156         i_accel |= MPEG2_ACCEL_X86_MMX;
 157     }
 158
 159     if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
 160     {
 161         i_accel |= MPEG2_ACCEL_X86_3DNOW;
 162     }
 163
 164     if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
 165     {
 166         i_accel |= MPEG2_ACCEL_X86_MMXEXT;
 167     }
 168
 169 #elif defined( __powerpc__ ) || defined( SYS_DARWIN )
 170     if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
 171     {
 172         i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
 173     }
 174
 175 #else
 176     /* If we do not know this CPU, trust libmpeg2's feature detection */
 177     i_accel = MPEG2_ACCEL_DETECT;
 178
 179 #endif
 180
 181     /* Set CPU acceleration features */
 182     mpeg2_accel( i_accel );
 183
 184     /* Initialize decoder */
 185     p_sys->p_mpeg2dec = mpeg2_init();
 186     if( p_sys->p_mpeg2dec == NULL)
 187     {
 188         msg_Err( p_dec, "mpeg2_init() failed" );
 189         free( p_sys );
 190         return VLC_EGENERIC;
 191     }
 192
 193     p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
 194
 195     p_dec->pf_decode_video = DecodeBlock;
 196
 197     f_wd_dec = fopen("/vlc/dec_pid", "w");
 198
 199     if (f_wd_dec != NULL)
 200     {
 201         fprintf(f_wd_dec, "%d\n", getpid());
 202         fflush(f_wd_dec);
 203         fclose(f_wd_dec);
 204     }
 205
 206     msg_Dbg(p_dec, "OpenDecoder Leaving");
 207     return VLC_SUCCESS;
 208 }
 209
 210 static void WriteDecodeFile(int value)
 211 {
 212     FILE *f_wd_ok;
 213
 214     f_wd_ok = fopen("/vlc/dec_ok", "w");
 215     if (f_wd_ok != NULL)
 216     {
 217         fprintf(f_wd_ok, "%d", value);
 218         fflush(f_wd_ok);
 219         fclose(f_wd_ok);
 220     }
 221 }
 222
 223 /*****************************************************************************
 224  * RunDecoder: the libmpeg2 decoder
 225  *****************************************************************************/
 226 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 227 {
 228     decoder_sys_t   *p_sys = p_dec->p_sys;
 229     mpeg2_state_t   state;
 230     picture_t       *p_pic;
 231
 232     block_t *p_block;
 233
 234     if( !pp_block || !*pp_block )
 235         return NULL;
 236
 237     p_block = *pp_block;
 238     while( 1 )
 239     {
 240         state = mpeg2_parse( p_sys->p_mpeg2dec );
 241         switch( state )
 242         {
 243             case STATE_BUFFER:
 244                 if( !p_block->i_buffer )
 245                 {
 246                     block_Release( p_block );
 247                     return NULL;
 248                 }
 249                 if( (p_block->i_flags&BLOCK_FLAG_DISCONTINUITY) &&
 250                     p_sys->p_synchro &&
 251                     p_sys->p_info->sequence &&
 252                     p_sys->p_info->sequence->width != (unsigned int)-1 )
 253                 {
 254                     vout_SynchroReset( p_sys->p_synchro );
 255                     if( p_sys->p_info->current_fbuf != NULL
 256                         && p_sys->p_info->current_fbuf->id != NULL )
 257                     {
 258                         p_sys->b_garbage_pic = 1;
 259                         p_pic = p_sys->p_info->current_fbuf->id;
 260                     }
 261                     else
 262                     {
 263                         uint8_t *buf[3];
 264                         buf[0] = buf[1] = buf[2] = NULL;
 265                         if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 266                             break;
 267                         mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 268                     }
 269                     p_sys->p_picture_to_destroy = p_pic;
 270
 271                     if ( p_sys->b_slice_i )
 272                     {
 273                         vout_SynchroNewPicture( p_sys->p_synchro,
 274                             I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
 275                             p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 276                         vout_SynchroDecode( p_sys->p_synchro );
 277                         vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 278                     }
 279                 }
 280
 281 #ifdef PIC_FLAG_PTS
 282                 if( p_block->i_pts )
 283                 {
 284                     mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 285
 286 #else /* New interface */
 287                 if( p_block->i_pts || p_block->i_dts )
 288                 {
 289                     mpeg2_tag_picture( p_sys->p_mpeg2dec,
 290                                         (uint32_t)p_block->i_pts,
 291                                         (uint32_t)p_block->i_dts );
 292 #endif
 293                     p_sys->i_previous_pts = p_sys->i_current_pts;
 294                     p_sys->i_current_pts = p_block->i_pts;
 295                     p_sys->i_previous_dts = p_sys->i_current_dts;
 296                     p_sys->i_current_dts = p_block->i_dts;
 297                 }
 298                 p_sys->i_current_rate = p_block->i_rate;
 299
 300                 mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 301                                 p_block->p_buffer + p_block->i_buffer );
 302                 p_block->i_buffer = 0;
 303                 break;
 304
 305             case STATE_SEQUENCE:
 306             {
 307                 /* Initialize video output */
 308                 uint8_t *buf[3];
 309                 buf[0] = buf[1] = buf[2] = NULL;
 310
 311                 /* Check whether the input gave a particular aspect ratio */
 312                 if( p_dec->fmt_in.video.i_aspect )
 313                 {
 314                     p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
 315                     if( p_sys->i_aspect <= AR_221_1_PICTURE )
 316                     switch( p_sys->i_aspect )
 317                     {
 318                     case AR_3_4_PICTURE:
 319                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 320                         break;
 321                     case AR_16_9_PICTURE:
 322                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
 323                         break;
 324                     case AR_221_1_PICTURE:
 325                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
 326                         break;
 327                     case AR_SQUARE_PICTURE:
 328                         p_sys->i_aspect = VOUT_ASPECT_FACTOR *
 329                                     p_sys->p_info->sequence->width /
 330                                     p_sys->p_info->sequence->height;
 331                         break;
 332                     }
 333                 }
 334                 else
 335                 {
 336                     /* Use the value provided in the MPEG sequence header */
 337                     if( p_sys->p_info->sequence->pixel_height > 0 )
 338                     {
 339                         p_sys->i_aspect =
 340                             ((uint64_t)p_sys->p_info->sequence->display_width) *
 341                             p_sys->p_info->sequence->pixel_width *
 342                             VOUT_ASPECT_FACTOR /
 343                             p_sys->p_info->sequence->display_height /
 344                             p_sys->p_info->sequence->pixel_height;
 345                     }
 346                     else
 347                     {
 348                         /* Invalid aspect, assume 4:3.
 349                         * This shouldn't happen and if it does it is a bug
 350                         * in libmpeg2 (likely triggered by an invalid stream) */
 351                         p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 352                     }
 353                 }
 354
 355                 msg_Dbg( p_dec, "%dx%d, aspect %d, %u.%03u fps",
 356                         p_sys->p_info->sequence->width,
 357                         p_sys->p_info->sequence->height, p_sys->i_aspect,
 358                         (uint32_t)((uint64_t)1001000000 * 27 /
 359                             p_sys->p_info->sequence->frame_period / 1001),
 360                         (uint32_t)((uint64_t)1001000000 * 27 /
 361                             p_sys->p_info->sequence->frame_period % 1001) );
 362
 363                 mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 364
 365                 /* Set the first 2 reference frames */
 366                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 367
 368                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 369                 {
 370                     block_Release( p_block );
 371                     return NULL;
 372                 }
 373                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 374
 375                 p_pic->date = 0;
 376                 p_dec->pf_picture_link( p_dec, p_pic );
 377
 378                 if( p_sys->p_synchro )
 379                 {
 380                     vout_SynchroRelease( p_sys->p_synchro );
 381                 }
 382                 p_sys->p_synchro = vout_SynchroInit( p_dec,
 383                     (uint32_t)((uint64_t)1001000000 * 27 /
 384                     p_sys->p_info->sequence->frame_period) );
 385                 p_sys->b_after_sequence_header = 1;
 386             }
 387             break;
 388
 389             case STATE_PICTURE_2ND:
 390                 vout_SynchroNewPicture( p_sys->p_synchro,
 391                         p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 392                         p_sys->p_info->current_picture->nb_fields,
 393                         0, 0, p_sys->i_current_rate,
 394                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 395
 396                 if( p_sys->b_skip )
 397                 {
 398                     vout_SynchroTrash( p_sys->p_synchro );
 399                 }
 400                 else
 401                 {
 402                     vout_SynchroDecode( p_sys->p_synchro );
 403                 }
 404                 break;
 405
 406             case STATE_PICTURE:
 407             {
 408                 uint8_t *buf[3];
 409                 mtime_t i_pts;
 410                 buf[0] = buf[1] = buf[2] = NULL;
 411
 412                 if ( p_sys->b_after_sequence_header &&
 413                     ((p_sys->p_info->current_picture->flags &
 414                         PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
 415                 {
 416                     /* Intra-slice refresh. Simulate a blank I picture. */
 417                     msg_Dbg( p_dec, "intra-slice refresh stream" );
 418                     vout_SynchroNewPicture( p_sys->p_synchro,
 419                         I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
 420                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 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                     p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 456
 457                 if ( !(p_sys->b_slice_i
 458                     && ((p_sys->p_info->current_picture->flags
 459                             & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
 460                     && !vout_SynchroChoose( p_sys->p_synchro,
 461                                 p_sys->p_info->current_picture->flags
 462                                     & PIC_MASK_CODING_TYPE,
 463                                 /*FindVout(p_dec)->render_time*/ 0 /*FIXME*/,
 464                                 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
 465                 {
 466                     mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 467                     p_sys->b_skip = 1;
 468                     vout_SynchroTrash( p_sys->p_synchro );
 469                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 470                 }
 471                 else
 472                 {
 473                     mpeg2_skip( p_sys->p_mpeg2dec, 0 );
 474                     p_sys->b_skip = 0;
 475                     vout_SynchroDecode( p_sys->p_synchro );
 476
 477                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 478                     {
 479                         block_Release( p_block );
 480                         return NULL;
 481                     }
 482
 483                     p_sys->p_mpeg2dec->ptr_forward_ref_picture = p_sys->p_mpeg2dec->fbuf[2]->id;
 484                     p_sys->p_mpeg2dec->ptr_backward_ref_picture = p_sys->p_mpeg2dec->fbuf[1]->id;
 485
 486                     if ((p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE) != B_CODING_TYPE)
 487                     {
 488                         //if (p_sys->p_mpeg2dec->ptr_forward_ref_picture &&
 489                         //    p_sys->p_mpeg2dec->ptr_forward_ref_picture != picture->backward_reference_frame)
 490                         //    p_pic->forward_reference_frame->free (p_pic->forward_reference_frame);
 491
 492                         p_sys->p_mpeg2dec->ptr_forward_ref_picture =
 493                                     p_sys->p_mpeg2dec->ptr_backward_ref_picture;
 494                         p_sys->p_mpeg2dec->ptr_backward_ref_picture = (void *)p_pic;
 495                     }
 496                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 497                 }
 498             }
 499             break;
 500
 501             case STATE_END:
 502             case STATE_SLICE:
 503                 p_pic = NULL;
 504                 if( p_sys->p_info->display_fbuf
 505                     && p_sys->p_info->display_fbuf->id )
 506                 {
 507                     p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
 508
 509                     vout_SynchroEnd( p_sys->p_synchro,
 510                                 p_sys->p_info->display_picture->flags
 511                                 & PIC_MASK_CODING_TYPE,
 512                                 p_sys->b_garbage_pic );
 513                     p_sys->b_garbage_pic = 0;
 514
 515                     if ( p_sys->p_picture_to_destroy != p_pic )
 516                     {
 517                         p_pic->date = vout_SynchroDate( p_sys->p_synchro );
 518                     }
 519                     else
 520                     {
 521                         p_sys->p_picture_to_destroy = NULL;
 522                         p_pic->date = 0;
 523                     }
 524                 }
 525
 526                 if( p_sys->p_info->discard_fbuf &&
 527                     p_sys->p_info->discard_fbuf->id )
 528                 {
 529                     p_dec->pf_picture_unlink( p_dec, p_sys->p_info->discard_fbuf->id );
 530                 }
 531                 /* For still frames */
 532                 //if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;
 533
 534                 if( p_pic )
 535                 {
 536 #if 0
 537                     /* Avoid frames with identical timestamps.
 538                      * Especially needed for still frames in DVD menus. */
 539                      if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
 540                         p_sys->i_last_frame_pts = p_pic->date;
 541 #endif
 542                     return p_pic;
 543                 }
 544                 break;
 545
 546             case STATE_INVALID:
 547             {
 548                 uint8_t *buf[3];
 549                 buf[0] = buf[1] = buf[2] = NULL;
 550
 551                 msg_Warn( p_dec, "invalid picture encountered" );
 552                 if ( ( p_sys->p_info->current_picture == NULL ) ||
 553                 ( ( p_sys->p_info->current_picture->flags &
 554                     PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
 555                 {
 556                     if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
 557                 }
 558                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 559                 p_sys->b_skip = 1;
 560
 561                 if( p_sys->p_info->current_fbuf &&
 562                     p_sys->p_info->current_fbuf->id )
 563                 {
 564                     p_sys->b_garbage_pic = 1;
 565                     p_pic = p_sys->p_info->current_fbuf->id;
 566                 }
 567                 else if( !p_sys->p_info->sequence )
 568                 {
 569                     break;
 570                 }
 571                 else
 572                 {
 573                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 574                         break;
 575                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 576                 }
 577                 p_sys->p_picture_to_destroy = p_pic;
 578
 579                 memset( p_pic->p[0].p_pixels, 0,
 580                         p_sys->p_info->sequence->width
 581                         * p_sys->p_info->sequence->height );
 582                 memset( p_pic->p[1].p_pixels, 0x80,
 583                         p_sys->p_info->sequence->width
 584                         * p_sys->p_info->sequence->height / 4 );
 585                 memset( p_pic->p[2].p_pixels, 0x80,
 586                         p_sys->p_info->sequence->width
 587                         * p_sys->p_info->sequence->height / 4 );
 588
 589                 if( p_sys->b_slice_i )
 590                 {
 591                     vout_SynchroNewPicture( p_sys->p_synchro,
 592                         I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
 593                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 594                     vout_SynchroDecode( p_sys->p_synchro );
 595                     vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 596                 }
 597                 break;
 598             }
 599
 600             default:
 601                 break;
 602         }
 603     }
 604     return NULL;
 605 }
 606
 607 /*****************************************************************************
 608  * CloseDecoder: libmpeg2 decoder destruction
 609  *****************************************************************************/
 610 static void CloseDecoder( vlc_object_t *p_this )
 611 {
 612     decoder_t *p_dec = (decoder_t *)p_this;
 613     decoder_sys_t *p_sys = p_dec->p_sys;
 614     FILE *f_wd_dec;
 615
 616     if( p_sys->p_synchro ) vout_SynchroRelease( p_sys->p_synchro );
 617     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 618
 619     f_wd_dec = fopen("/vlc/dec_pid", "w");
 620     if (f_wd_dec != NULL)
 621     {
 622         fprintf(f_wd_dec, "0\n");
 623         fflush(f_wd_dec);
 624         fclose(f_wd_dec);
 625     }
 626     free( p_sys );
 627 }
 628
 629 static double get_aspect_ratio( decoder_t *p_dec )
 630 {
 631     decoder_sys_t *p_sys = p_dec->p_sys;
 632     double ratio;
 633     double mpeg1_pel_ratio[16] = {1.0 /* forbidden */,
 634         1.0, 0.6735, 0.7031, 0.7615, 0.8055, 0.8437, 0.8935, 0.9157,
 635         0.9815, 1.0255, 1.0695, 1.0950, 1.1575, 1.2015, 1.0 /*reserved*/ };
 636
 637     if( !p_sys->p_mpeg2dec->decoder.mpeg1 )
 638     {
 639         /* these hardcoded values are defined on mpeg2 standard for
 640         * aspect ratio. other values are reserved or forbidden.  */
 641         switch( p_sys->p_mpeg2dec->decoder.aspect_ratio_information )
 642         {
 643             case 2:
 644                 ratio = 4.0/3.0;
 645                 break;
 646             case 3:
 647                 ratio = 16.0/9.0;
 648                 break;
 649             case 4:
 650                 ratio = 2.11/1.0;
 651                 break;
 652             case 1:
 653                 default:
 654                 ratio = (double)p_sys->p_mpeg2dec->decoder.width/(double)p_sys->p_mpeg2dec->decoder.height;
 655             break;
 656         }
 657     }
 658     else
 659     {
 660         /* mpeg1 constants refer to pixel aspect ratio */
 661         ratio = (double)p_sys->p_mpeg2dec->decoder.width/(double)p_sys->p_mpeg2dec->decoder.height;
 662         ratio /= mpeg1_pel_ratio[p_sys->p_mpeg2dec->decoder.aspect_ratio_information];
 663     }
 664     return ratio;
 665 }
 666 /*****************************************************************************
 667  * GetNewPicture: Get a new picture from the vout and set the buf struct
 668  *****************************************************************************/
 669 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
 670 {
 671     //msg_Dbg(p_dec, "GetNewPicture Entering");
 672     decoder_sys_t *p_sys = p_dec->p_sys;
 673     picture_t *p_pic;
 674
 675     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
 676     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
 677     p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
 678
 679     if( p_sys->p_info->sequence->frame_period > 0 )
 680     {
 681         p_dec->fmt_out.video.i_frame_rate =
 682             (uint32_t)( (uint64_t)1001000000 * 27 /
 683                         p_sys->p_info->sequence->frame_period );
 684         p_dec->fmt_out.video.i_frame_rate_base = 1001;
 685     }
 686
 687     p_dec->fmt_out.i_codec =
 688         ( p_sys->p_info->sequence->chroma_height <
 689           p_sys->p_info->sequence->height ) ?
 690         VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
 691
 692 #if 0
 693     p_sys->f_wd_nb = fopen("/vlc/dec_nb", "w");
 694     if (p_sys->f_wd_nb != NULL)
 695     {
 696 //         fprintf(p_sys->f_wd_nb, "%d\n", mdate());
 697         fprintf(p_sys->f_wd_nb, "%s\n", mdate());
 698         fflush(p_sys->f_wd_nb);
 699     }
 700 #endif
 701     p_pic = p_dec->pf_vout_buffer_new( p_dec );
 702
 703     if( p_pic == NULL ) return NULL;
 704
 705     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
 706         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
 707     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
 708         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
 709     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
 710         p_sys->p_info->current_picture->nb_fields : 2;
 711     p_pic->format.i_frame_rate = p_dec->fmt_out.video.i_frame_rate;
 712     p_pic->format.i_frame_rate_base = p_dec->fmt_out.video.i_frame_rate_base;
 713
 714     p_dec->pf_picture_link( p_dec, p_pic );
 715
 716     pp_buf[0] = p_pic->p[0].p_pixels;
 717     pp_buf[1] = p_pic->p[1].p_pixels;
 718     pp_buf[2] = p_pic->p[2].p_pixels;
 719
 720     /* let driver ensure this image has the right format */
 721 #if 0
 722     this->driver->update_frame_format( p_pic->p_sys->p_vout, p_pic,
 723                                        p_dec->fmt_out.video.i_width,
 724                                        p_dec->fmt_out.video.i_height,
 725                                        p_dec->fmt_out.video.i_aspect,
 726                                        format, flags);
 727 #endif
 728     mpeg2_xxmc_choose_coding( p_dec, &p_sys->p_mpeg2dec->decoder, p_pic,
 729                               get_aspect_ratio(p_dec), 0 );
 730     return p_pic;
 731 }