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