git.sesse.net Git - vlc/blob - modules/codec/libmpeg2.c

   1 /*****************************************************************************
   2  * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin@videolan.org>
   8  *          Christophe Massiot <massiot@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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, 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_block_helper.h>
  37 #include "../codec/cc.h"
  38
  39 #include <mpeg2.h>
  40
  41 #include <vlc_codec_synchro.h>
  42
  43 /*****************************************************************************
  44  * decoder_sys_t : libmpeg2 decoder descriptor
  45  *****************************************************************************/
  46 struct decoder_sys_t
  47 {
  48     /*
  49      * libmpeg2 properties
  50      */
  51     mpeg2dec_t          *p_mpeg2dec;
  52     const mpeg2_info_t  *p_info;
  53     bool                b_skip;
  54
  55     /*
  56      * Input properties
  57      */
  58     mtime_t          i_previous_pts;
  59     mtime_t          i_current_pts;
  60     mtime_t          i_previous_dts;
  61     mtime_t          i_current_dts;
  62     picture_t *      p_picture_to_destroy;
  63     bool             b_garbage_pic;
  64     bool             b_after_sequence_header; /* is it the next frame after
  65                                                * the sequence header ?    */
  66     bool             b_slice_i;             /* intra-slice refresh stream */
  67     bool             b_second_field;
  68
  69     bool             b_preroll;
  70
  71     /*
  72      * Output properties
  73      */
  74     decoder_synchro_t *p_synchro;
  75     int             i_aspect;
  76     int             i_sar_num;
  77     int             i_sar_den;
  78     mtime_t         i_last_frame_pts;
  79
  80     /* Closed captioning support */
  81     uint32_t        i_cc_flags;
  82     mtime_t         i_cc_pts;
  83     mtime_t         i_cc_dts;
  84     cc_data_t       cc;
  85     uint8_t        *p_gop_user_data;
  86     uint32_t        i_gop_user_data;
  87 };
  88
  89 /*****************************************************************************
  90  * Local prototypes
  91  *****************************************************************************/
  92 static int  OpenDecoder( vlc_object_t * );
  93 static void CloseDecoder( vlc_object_t * );
  94
  95 static picture_t *DecodeBlock( decoder_t *, block_t ** );
  96 static block_t   *GetCc( decoder_t *p_dec, bool pb_present[4] );
  97
  98 static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
  99 static void GetAR( decoder_t *p_dec );
 100
 101 /*****************************************************************************
 102  * Module descriptor
 103  *****************************************************************************/
 104 vlc_module_begin ()
 105     set_description( N_("MPEG I/II video decoder (using libmpeg2)") )
 106     set_capability( "decoder", 150 )
 107     set_category( CAT_INPUT )
 108     set_subcategory( SUBCAT_INPUT_VCODEC )
 109     set_callbacks( OpenDecoder, CloseDecoder )
 110     add_shortcut( "libmpeg2" )
 111 vlc_module_end ()
 112
 113 /*****************************************************************************
 114  * OpenDecoder: probe the decoder and return score
 115  *****************************************************************************/
 116 static int OpenDecoder( vlc_object_t *p_this )
 117 {
 118     decoder_t *p_dec = (decoder_t*)p_this;
 119     decoder_sys_t *p_sys;
 120     uint32_t i_accel = 0;
 121
 122     if( p_dec->fmt_in.i_codec != VLC_CODEC_MPGV &&
 123         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
 124         /* Pinnacle hardware-mpeg1 */
 125         p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
 126         p_dec->fmt_in.i_codec != VLC_CODEC_MP2V &&
 127         p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') &&
 128         p_dec->fmt_in.i_codec != VLC_FOURCC('h','d','v','2') )
 129     {
 130         return VLC_EGENERIC;
 131     }
 132
 133     /* Allocate the memory needed to store the decoder's structure */
 134     if( ( p_dec->p_sys = p_sys = calloc( 1, sizeof(*p_sys)) ) == NULL )
 135         return VLC_ENOMEM;
 136
 137     /* Initialize the thread properties */
 138     p_sys->p_mpeg2dec = NULL;
 139     p_sys->p_synchro  = NULL;
 140     p_sys->p_info     = NULL;
 141     p_sys->i_current_pts  = 0;
 142     p_sys->i_previous_pts = 0;
 143     p_sys->i_current_dts  = 0;
 144     p_sys->i_previous_dts = 0;
 145     p_sys->p_picture_to_destroy = NULL;
 146     p_sys->b_garbage_pic = 0;
 147     p_sys->b_slice_i  = 0;
 148     p_sys->b_second_field = 0;
 149     p_sys->b_skip     = 0;
 150     p_sys->b_preroll = false;
 151
 152     p_sys->i_cc_pts = 0;
 153     p_sys->i_cc_dts = 0;
 154     p_sys->i_cc_flags = 0;
 155 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 156     p_dec->pf_get_cc = GetCc;
 157     cc_Init( &p_sys->cc );
 158 #endif
 159     p_sys->p_gop_user_data = NULL;
 160     p_sys->i_gop_user_data = 0;
 161
 162 #if defined( __i386__ ) || defined( __x86_64__ )
 163     if( vlc_CPU() & CPU_CAPABILITY_MMX )
 164     {
 165         i_accel |= MPEG2_ACCEL_X86_MMX;
 166     }
 167
 168     if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
 169     {
 170         i_accel |= MPEG2_ACCEL_X86_3DNOW;
 171     }
 172
 173     if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
 174     {
 175         i_accel |= MPEG2_ACCEL_X86_MMXEXT;
 176     }
 177
 178 #elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
 179     if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
 180     {
 181         i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
 182     }
 183
 184 #else
 185     /* If we do not know this CPU, trust libmpeg2's feature detection */
 186     i_accel = MPEG2_ACCEL_DETECT;
 187
 188 #endif
 189
 190     /* Set CPU acceleration features */
 191     mpeg2_accel( i_accel );
 192
 193     /* Initialize decoder */
 194     p_sys->p_mpeg2dec = mpeg2_init();
 195     if( p_sys->p_mpeg2dec == NULL)
 196     {
 197         msg_Err( p_dec, "mpeg2_init() failed" );
 198         free( p_sys );
 199         return VLC_EGENERIC;
 200     }
 201
 202     p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );
 203
 204     p_dec->pf_decode_video = DecodeBlock;
 205     p_dec->fmt_out.i_cat = VIDEO_ES;
 206     p_dec->fmt_out.i_codec = 0;
 207
 208     return VLC_SUCCESS;
 209 }
 210
 211 /*****************************************************************************
 212  * RunDecoder: the libmpeg2 decoder
 213  *****************************************************************************/
 214 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 215 {
 216     decoder_sys_t   *p_sys = p_dec->p_sys;
 217     mpeg2_state_t   state;
 218     picture_t       *p_pic;
 219
 220     block_t *p_block;
 221
 222     if( !pp_block || !*pp_block ) return NULL;
 223
 224     p_block = *pp_block;
 225
 226     while( 1 )
 227     {
 228         state = mpeg2_parse( p_sys->p_mpeg2dec );
 229
 230         switch( state )
 231         {
 232         case STATE_BUFFER:
 233             if( !p_block->i_buffer )
 234             {
 235                 block_Release( p_block );
 236                 return NULL;
 237             }
 238             if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
 239                                       | BLOCK_FLAG_CORRUPTED))
 240                 cc_Flush( &p_sys->cc );
 241
 242             if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
 243                                       | BLOCK_FLAG_CORRUPTED)) &&
 244                 p_sys->p_synchro &&
 245                 p_sys->p_info->sequence &&
 246                 p_sys->p_info->sequence->width != (unsigned)-1 )
 247             {
 248                 decoder_SynchroReset( p_sys->p_synchro );
 249                 if( p_sys->p_info->current_fbuf != NULL
 250                     && p_sys->p_info->current_fbuf->id != NULL )
 251                 {
 252                     p_sys->b_garbage_pic = 1;
 253                     p_pic = p_sys->p_info->current_fbuf->id;
 254                 }
 255                 else
 256                 {
 257                     uint8_t *buf[3];
 258                     buf[0] = buf[1] = buf[2] = NULL;
 259                     if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 260                     {
 261                         p_block->i_buffer = 0;
 262                         break;
 263                     }
 264                     mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 265                     mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
 266                 }
 267                 p_sys->p_picture_to_destroy = p_pic;
 268
 269                 if ( p_sys->b_slice_i )
 270                 {
 271                     decoder_SynchroNewPicture( p_sys->p_synchro,
 272                         I_CODING_TYPE, 2, 0, 0,
 273                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 274                     decoder_SynchroDecode( p_sys->p_synchro );
 275                     decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 276                 }
 277             }
 278
 279             if( p_block->i_flags & BLOCK_FLAG_PREROLL )
 280             {
 281                 p_sys->b_preroll = true;
 282             }
 283             else if( p_sys->b_preroll )
 284             {
 285                 p_sys->b_preroll = false;
 286                 /* Reset synchro */
 287                 decoder_SynchroReset( p_sys->p_synchro );
 288             }
 289
 290 #ifdef PIC_FLAG_PTS
 291             if( p_block->i_pts )
 292             {
 293                 mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
 294
 295 #else /* New interface */
 296             if( p_block->i_pts || p_block->i_dts )
 297             {
 298                 mpeg2_tag_picture( p_sys->p_mpeg2dec,
 299                                    (uint32_t)p_block->i_pts,
 300                                    (uint32_t)p_block->i_dts );
 301 #endif
 302                 p_sys->i_previous_pts = p_sys->i_current_pts;
 303                 p_sys->i_current_pts = p_block->i_pts;
 304                 p_sys->i_previous_dts = p_sys->i_current_dts;
 305                 p_sys->i_current_dts = p_block->i_dts;
 306             }
 307
 308             mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
 309                           p_block->p_buffer + p_block->i_buffer );
 310
 311             p_block->i_buffer = 0;
 312             break;
 313
 314 #if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
 315
 316         case STATE_SEQUENCE_MODIFIED:
 317             GetAR( p_dec );
 318             break;
 319 #endif
 320
 321         case STATE_SEQUENCE:
 322         {
 323             /* Initialize video output */
 324             uint8_t *buf[3];
 325             buf[0] = buf[1] = buf[2] = NULL;
 326
 327             GetAR( p_dec );
 328
 329             mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
 330
 331             /* Set the first 2 reference frames */
 332             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 333
 334             if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 335             {
 336                 block_Release( p_block );
 337                 return NULL;
 338             }
 339
 340             mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 341             mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
 342
 343             /* This picture will never go through display_picture. */
 344             p_pic->date = 0;
 345
 346             /* For some reason, libmpeg2 will put this pic twice in
 347              * discard_picture. This can be considered a bug in libmpeg2. */
 348             decoder_LinkPicture( p_dec, p_pic );
 349
 350             if( p_sys->p_synchro )
 351             {
 352                 decoder_SynchroRelease( p_sys->p_synchro );
 353             }
 354             p_sys->p_synchro = decoder_SynchroInit( p_dec,
 355                 (uint32_t)((uint64_t)1001000000 * 27 /
 356                 p_sys->p_info->sequence->frame_period) );
 357             p_sys->b_after_sequence_header = 1;
 358         }
 359         break;
 360
 361         case STATE_PICTURE_2ND:
 362             p_sys->b_second_field = 1;
 363             break;
 364
 365         case STATE_PICTURE:
 366         {
 367             uint8_t *buf[3];
 368             mtime_t i_pts, i_dts;
 369             buf[0] = buf[1] = buf[2] = NULL;
 370
 371             if ( p_sys->b_after_sequence_header &&
 372                  ((p_sys->p_info->current_picture->flags &
 373                        PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P) )
 374             {
 375                 /* Intra-slice refresh. Simulate a blank I picture. */
 376                 msg_Dbg( p_dec, "intra-slice refresh stream" );
 377                 decoder_SynchroNewPicture( p_sys->p_synchro,
 378                     I_CODING_TYPE, 2, 0, 0,
 379                     p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 380                 decoder_SynchroDecode( p_sys->p_synchro );
 381                 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 382                 p_sys->b_slice_i = 1;
 383             }
 384             p_sys->b_after_sequence_header = 0;
 385
 386 #ifdef PIC_FLAG_PTS
 387             i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
 388                 ( ( p_sys->p_info->current_picture->pts ==
 389                     (uint32_t)p_sys->i_current_pts ) ?
 390                   p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 391             i_dts = 0;
 392
 393             /* Hack to handle demuxers which only have DTS timestamps */
 394             if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
 395             {
 396                 if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
 397                     (p_sys->p_info->current_picture->flags &
 398                       PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 399                 {
 400                     i_pts = p_block->i_dts;
 401                 }
 402             }
 403             p_block->i_pts = p_block->i_dts = 0;
 404             /* End hack */
 405
 406 #else /* New interface */
 407
 408             i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
 409                 ( ( p_sys->p_info->current_picture->tag ==
 410                     (uint32_t)p_sys->i_current_pts ) ?
 411                   p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
 412             i_dts = p_sys->p_info->current_picture->flags & PIC_FLAG_TAGS ?
 413                 ( ( p_sys->p_info->current_picture->tag2 ==
 414                     (uint32_t)p_sys->i_current_dts ) ?
 415                   p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
 416 #endif
 417
 418             /* If nb_fields == 1, it is a field picture, and it will be
 419              * followed by another field picture for which we won't call
 420              * decoder_SynchroNewPicture() because this would have other
 421              * problems, so we take it into account here.
 422              * This kind of sucks, but I didn't think better. --Meuuh
 423              */
 424             decoder_SynchroNewPicture( p_sys->p_synchro,
 425                 p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
 426                 p_sys->p_info->current_picture->nb_fields == 1 ? 2 :
 427                 p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
 428                 p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 429
 430
 431             bool b_skip = false;
 432             if( !p_dec->b_pace_control && !p_sys->b_preroll &&
 433                 !(p_sys->b_slice_i
 434                    && ((p_sys->p_info->current_picture->flags
 435                          & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P))
 436                    && !decoder_SynchroChoose( p_sys->p_synchro,
 437                               p_sys->p_info->current_picture->flags
 438                                 & PIC_MASK_CODING_TYPE,
 439                               /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
 440                               p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
 441             {
 442                 b_skip = true;
 443             }
 444
 445             p_pic = NULL;
 446             if( !b_skip )
 447                 p_pic = GetNewPicture( p_dec, buf );
 448
 449             if( b_skip || !p_pic )
 450             {
 451                 mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 452                 p_sys->b_skip = 1;
 453                 decoder_SynchroTrash( p_sys->p_synchro );
 454                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
 455
 456                 if( !b_skip )
 457                 {
 458                     block_Release( p_block );
 459                     return NULL;
 460                 }
 461             }
 462             else
 463             {
 464                 mpeg2_skip( p_sys->p_mpeg2dec, 0 );
 465                 p_sys->b_skip = 0;
 466                 decoder_SynchroDecode( p_sys->p_synchro );
 467
 468                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 469                 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
 470             }
 471             if( p_sys->p_info->user_data_len > 2 || p_sys->i_gop_user_data > 2 )
 472             {
 473                 p_sys->i_cc_pts = i_pts;
 474                 p_sys->i_cc_dts = i_dts;
 475                 if( (p_sys->p_info->current_picture->flags
 476                              & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
 477                     p_sys->i_cc_flags = BLOCK_FLAG_TYPE_P;
 478                 else if( (p_sys->p_info->current_picture->flags
 479                              & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
 480                     p_sys->i_cc_flags = BLOCK_FLAG_TYPE_B;
 481                 else p_sys->i_cc_flags = BLOCK_FLAG_TYPE_I;
 482
 483                 if( p_sys->i_gop_user_data > 2 )
 484                 {
 485                     /* We now have picture info for any cached user_data out of the gop */
 486                     cc_Extract( &p_sys->cc, &p_sys->p_gop_user_data[0], p_sys->i_gop_user_data );
 487                     p_sys->i_gop_user_data = 0;
 488                 }
 489
 490                 /* Extract the CC from the user_data of the picture */
 491                 if( p_sys->p_info->user_data_len > 2 )
 492                     cc_Extract( &p_sys->cc, &p_sys->p_info->user_data[0], p_sys->p_info->user_data_len );
 493             }
 494         }
 495         break;
 496
 497         case STATE_GOP:
 498             /* There can be userdata in a GOP. It needs to be remembered for the next picture. */
 499             if( p_sys->p_info->user_data_len > 2 )
 500             {
 501                 free( p_sys->p_gop_user_data );
 502                 p_sys->p_gop_user_data = calloc( p_sys->p_info->user_data_len, sizeof(uint8_t) );
 503                 if( p_sys->p_gop_user_data )
 504                 {
 505                     p_sys->i_gop_user_data = p_sys->p_info->user_data_len;
 506                     memcpy( p_sys->p_gop_user_data, p_sys->p_info->user_data, p_sys->p_info->user_data_len );
 507                 }
 508             }
 509             break;
 510
 511         case STATE_END:
 512         case STATE_SLICE:
 513             p_pic = NULL;
 514             if( p_sys->p_info->display_fbuf
 515                 && p_sys->p_info->display_fbuf->id )
 516             {
 517                 p_pic = (picture_t *)p_sys->p_info->display_fbuf->id;
 518
 519                 decoder_SynchroEnd( p_sys->p_synchro,
 520                             p_sys->p_info->display_picture->flags
 521                              & PIC_MASK_CODING_TYPE,
 522                             p_sys->b_garbage_pic );
 523                 p_sys->b_garbage_pic = 0;
 524
 525                 if( p_sys->p_picture_to_destroy != p_pic )
 526                 {
 527                     p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
 528                 }
 529                 else
 530                 {
 531                     p_sys->p_picture_to_destroy = NULL;
 532                     p_pic->date = 0;
 533                 }
 534             }
 535
 536             if( p_sys->p_info->discard_fbuf &&
 537                 p_sys->p_info->discard_fbuf->id )
 538             {
 539                 decoder_UnlinkPicture( p_dec,
 540                                        p_sys->p_info->discard_fbuf->id );
 541             }
 542
 543             /* For still frames */
 544             if( state == STATE_END && p_pic ) p_pic->b_force = true;
 545
 546             if( p_pic )
 547             {
 548                 /* Avoid frames with identical timestamps.
 549                  * Especially needed for still frames in DVD menus. */
 550                 if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
 551                 p_sys->i_last_frame_pts = p_pic->date;
 552
 553                 return p_pic;
 554             }
 555             break;
 556
 557         case STATE_INVALID:
 558         {
 559             uint8_t *buf[3];
 560             buf[0] = buf[1] = buf[2] = NULL;
 561
 562             msg_Warn( p_dec, "invalid picture encountered" );
 563             if ( ( p_sys->p_info->current_picture == NULL ) ||
 564                ( ( p_sys->p_info->current_picture->flags &
 565                    PIC_MASK_CODING_TYPE) != PIC_FLAG_CODING_TYPE_B ) )
 566             {
 567                 if( p_sys->p_synchro ) decoder_SynchroReset( p_sys->p_synchro );
 568             }
 569             mpeg2_skip( p_sys->p_mpeg2dec, 1 );
 570             p_sys->b_skip = 1;
 571             cc_Flush( &p_sys->cc );
 572
 573             if( p_sys->p_info->current_fbuf &&
 574                 p_sys->p_info->current_fbuf->id )
 575             {
 576                 p_sys->b_garbage_pic = 1;
 577                 p_pic = p_sys->p_info->current_fbuf->id;
 578             }
 579             else if( !p_sys->p_info->sequence )
 580             {
 581                 break;
 582             }
 583             else
 584             {
 585                 if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
 586                     break;
 587                 mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
 588                 mpeg2_stride( p_sys->p_mpeg2dec, p_pic->p[Y_PLANE].i_pitch );
 589             }
 590             p_sys->p_picture_to_destroy = p_pic;
 591
 592             memset( p_pic->p[0].p_pixels, 0,
 593                     p_sys->p_info->sequence->width
 594                      * p_sys->p_info->sequence->height );
 595             memset( p_pic->p[1].p_pixels, 0x80,
 596                     p_sys->p_info->sequence->width
 597                      * p_sys->p_info->sequence->height / 4 );
 598             memset( p_pic->p[2].p_pixels, 0x80,
 599                     p_sys->p_info->sequence->width
 600                      * p_sys->p_info->sequence->height / 4 );
 601
 602             if( p_sys->b_slice_i )
 603             {
 604                 decoder_SynchroNewPicture( p_sys->p_synchro,
 605                         I_CODING_TYPE, 2, 0, 0,
 606                         p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
 607                 decoder_SynchroDecode( p_sys->p_synchro );
 608                 decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
 609             }
 610             break;
 611         }
 612
 613         default:
 614             break;
 615         }
 616     }
 617
 618     /* Never reached */
 619     return NULL;
 620 }
 621
 622 /*****************************************************************************
 623  * CloseDecoder: libmpeg2 decoder destruction
 624  *****************************************************************************/
 625 static void CloseDecoder( vlc_object_t *p_this )
 626 {
 627     decoder_t *p_dec = (decoder_t *)p_this;
 628     decoder_sys_t *p_sys = p_dec->p_sys;
 629
 630     free( p_sys->p_gop_user_data );
 631
 632     if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
 633
 634     if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
 635
 636     free( p_sys );
 637 }
 638
 639 /*****************************************************************************
 640  * GetNewPicture: Get a new picture from the vout and set the buf struct
 641  *****************************************************************************/
 642 static picture_t *GetNewPicture( decoder_t *p_dec, uint8_t **pp_buf )
 643 {
 644     decoder_sys_t *p_sys = p_dec->p_sys;
 645     picture_t *p_pic;
 646
 647     p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
 648     p_dec->fmt_out.video.i_visible_width =
 649         p_sys->p_info->sequence->picture_width;
 650     p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
 651     p_dec->fmt_out.video.i_visible_height =
 652         p_sys->p_info->sequence->picture_height;
 653     p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
 654     p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
 655     p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
 656
 657     if( p_sys->p_info->sequence->frame_period > 0 )
 658     {
 659         p_dec->fmt_out.video.i_frame_rate =
 660             (uint32_t)( (uint64_t)1001000000 * 27 /
 661                         p_sys->p_info->sequence->frame_period );
 662         p_dec->fmt_out.video.i_frame_rate_base = 1001;
 663     }
 664
 665     p_dec->fmt_out.i_codec =
 666         ( p_sys->p_info->sequence->chroma_height <
 667           p_sys->p_info->sequence->height ) ?
 668         VLC_CODEC_I420 : VLC_CODEC_I422;
 669
 670     /* Get a new picture */
 671     p_pic = decoder_NewPicture( p_dec );
 672
 673     if( p_pic == NULL ) return NULL;
 674
 675     p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
 676         p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
 677     p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
 678         p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
 679     p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
 680         p_sys->p_info->current_picture->nb_fields : 2;
 681
 682     decoder_LinkPicture( p_dec, p_pic );
 683
 684     pp_buf[0] = p_pic->p[0].p_pixels;
 685     pp_buf[1] = p_pic->p[1].p_pixels;
 686     pp_buf[2] = p_pic->p[2].p_pixels;
 687
 688     return p_pic;
 689 }
 690
 691 /*****************************************************************************
 692  * GetCc: Retrieves the Closed Captions for the CC decoder.
 693  *****************************************************************************/
 694 static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
 695 {
 696     decoder_sys_t   *p_sys = p_dec->p_sys;
 697     block_t         *p_cc = NULL;
 698     int i;
 699
 700     for( i = 0; i < 4; i++ )
 701         pb_present[i] = p_sys->cc.pb_present[i];
 702
 703     if( p_sys->cc.i_data <= 0 )
 704         return NULL;
 705
 706     p_cc = block_New( p_dec, p_sys->cc.i_data);
 707     if( p_cc )
 708     {
 709         memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
 710         p_cc->i_dts =
 711         p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
 712         p_cc->i_flags = ( p_sys->cc.b_reorder  ? p_sys->i_cc_flags : BLOCK_FLAG_TYPE_P ) & ( BLOCK_FLAG_TYPE_I|BLOCK_FLAG_TYPE_P|BLOCK_FLAG_TYPE_B);
 713     }
 714     cc_Flush( &p_sys->cc );
 715     return p_cc;
 716 }
 717
 718 /*****************************************************************************
 719  * GetAR: Get aspect ratio
 720  *****************************************************************************/
 721 static void GetAR( decoder_t *p_dec )
 722 {
 723     decoder_sys_t *p_sys = p_dec->p_sys;
 724
 725     /* Check whether the input gave a particular aspect ratio */
 726     if( p_dec->fmt_in.video.i_aspect )
 727     {
 728         p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
 729     }
 730     else
 731     {
 732         /* Use the value provided in the MPEG sequence header */
 733         if( p_sys->p_info->sequence->pixel_height > 0 )
 734         {
 735             p_sys->i_aspect =
 736                 ((uint64_t)p_sys->p_info->sequence->picture_width) *
 737                 p_sys->p_info->sequence->pixel_width *
 738                 VOUT_ASPECT_FACTOR /
 739                 p_sys->p_info->sequence->picture_height /
 740                 p_sys->p_info->sequence->pixel_height;
 741             p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
 742             p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
 743         }
 744         else
 745         {
 746             /* Invalid aspect, assume 4:3.
 747              * This shouldn't happen and if it does it is a bug
 748              * in libmpeg2 (likely triggered by an invalid stream) */
 749             p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
 750             p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
 751             p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
 752         }
 753     }
 754
 755     msg_Dbg( p_dec, "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
 756              p_sys->p_info->sequence->picture_width,
 757              p_sys->p_info->sequence->picture_height,
 758              p_sys->p_info->sequence->display_width,
 759              p_sys->p_info->sequence->display_height,
 760              p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
 761              (uint32_t)((uint64_t)1001000000 * 27 /
 762                  p_sys->p_info->sequence->frame_period / 1001),
 763              (uint32_t)((uint64_t)1001000000 * 27 /
 764                  p_sys->p_info->sequence->frame_period % 1001) );
 765 }