git.sesse.net Git - vlc/blob - modules/demux/mkv/mkv.cpp

   1 /*****************************************************************************
   2  * mkv.cpp : matroska demuxer
   3  *****************************************************************************
   4  * Copyright (C) 2003-2005, 2008, 2010 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Steve Lhomme <steve.lhomme@free.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 #include "mkv.hpp"
  26 #include "util.hpp"
  27
  28 #include "matroska_segment.hpp"
  29 #include "demux.hpp"
  30
  31 #include "chapters.hpp"
  32 #include "Ebml_parser.hpp"
  33
  34 #include "stream_io_callback.hpp"
  35
  36 #include <vlc_fs.h>
  37 #include <vlc_url.h>
  38
  39 /*****************************************************************************
  40  * Module descriptor
  41  *****************************************************************************/
  42 static int  Open ( vlc_object_t * );
  43 static void Close( vlc_object_t * );
  44
  45 vlc_module_begin ()
  46     set_shortname( "Matroska" )
  47     set_description( N_("Matroska stream demuxer" ) )
  48     set_capability( "demux", 50 )
  49     set_callbacks( Open, Close )
  50     set_category( CAT_INPUT )
  51     set_subcategory( SUBCAT_INPUT_DEMUX )
  52
  53     add_bool( "mkv-use-ordered-chapters", true,
  54             N_("Respect ordered chapters"),
  55             N_("Play chapters in the order specified in the segment."), false );
  56
  57     add_bool( "mkv-use-chapter-codec", true,
  58             N_("Chapter codecs"),
  59             N_("Use chapter codecs found in the segment."), true );
  60
  61     add_bool( "mkv-preload-local-dir", true,
  62             N_("Preload MKV files in the same directory"),
  63             N_("Preload matroska files in the same directory to find linked segments (not good for broken files)."), false );
  64
  65     add_bool( "mkv-seek-percent", false,
  66             N_("Seek based on percent not time"),
  67             N_("Seek based on percent not time."), true );
  68
  69     add_bool( "mkv-use-dummy", false,
  70             N_("Dummy Elements"),
  71             N_("Read and discard unknown EBML elements (not good for broken files)."), true );
  72
  73     add_shortcut( "mka", "mkv" )
  74 vlc_module_end ()
  75
  76 class demux_sys_t;
  77
  78 static int  Demux  ( demux_t * );
  79 static int  Control( demux_t *, int, va_list );
  80 static void Seek   ( demux_t *, mtime_t i_date, double f_percent, virtual_chapter_c *p_chapter );
  81
  82 /*****************************************************************************
  83  * Open: initializes matroska demux structures
  84  *****************************************************************************/
  85 static int Open( vlc_object_t * p_this )
  86 {
  87     demux_t            *p_demux = (demux_t*)p_this;
  88     demux_sys_t        *p_sys;
  89     matroska_stream_c  *p_stream;
  90     matroska_segment_c *p_segment;
  91     const uint8_t      *p_peek;
  92     std::string         s_path, s_filename;
  93     vlc_stream_io_callback *p_io_callback;
  94     EbmlStream         *p_io_stream;
  95     bool                b_need_preload = false;
  96
  97     /* peek the begining */
  98     if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC;
  99
 100     /* is a valid file */
 101     if( p_peek[0] != 0x1a || p_peek[1] != 0x45 ||
 102         p_peek[2] != 0xdf || p_peek[3] != 0xa3 ) return VLC_EGENERIC;
 103
 104     /* Set the demux function */
 105     p_demux->pf_demux   = Demux;
 106     p_demux->pf_control = Control;
 107     p_demux->p_sys      = p_sys = new demux_sys_t( *p_demux );
 108
 109     p_io_callback = new vlc_stream_io_callback( p_demux->s, false );
 110     p_io_stream = new EbmlStream( *p_io_callback );
 111
 112     if( p_io_stream == NULL )
 113     {
 114         msg_Err( p_demux, "failed to create EbmlStream" );
 115         delete p_io_callback;
 116         delete p_sys;
 117         return VLC_EGENERIC;
 118     }
 119
 120     p_stream = p_sys->AnalyseAllSegmentsFound( p_demux, p_io_stream, true );
 121     if( p_stream == NULL )
 122     {
 123         msg_Err( p_demux, "cannot find KaxSegment or missing mandatory KaxInfo" );
 124         goto error;
 125     }
 126     p_sys->streams.push_back( p_stream );
 127
 128     p_stream->p_io_callback = p_io_callback;
 129     p_stream->p_estream = p_io_stream;
 130
 131     for (size_t i=0; i<p_stream->segments.size(); i++)
 132     {
 133         p_stream->segments[i]->Preload();
 134         b_need_preload |= p_stream->segments[i]->b_ref_external_segments;
 135     }
 136
 137     p_segment = p_stream->segments[0];
 138     if( p_segment->cluster == NULL )
 139     {
 140         msg_Err( p_demux, "cannot find any cluster, damaged file ?" );
 141         goto error;
 142     }
 143
 144     if (b_need_preload && var_InheritBool( p_demux, "mkv-preload-local-dir" ))
 145     {
 146         msg_Dbg( p_demux, "Preloading local dir" );
 147         /* get the files from the same dir from the same family (based on p_demux->psz_path) */
 148         if ( p_demux->psz_file && !strcmp( p_demux->psz_access, "file" ) )
 149         {
 150             // assume it's a regular file
 151             // get the directory path
 152             s_path = p_demux->psz_file;
 153             if (s_path.at(s_path.length() - 1) == DIR_SEP_CHAR)
 154             {
 155                 s_path = s_path.substr(0,s_path.length()-1);
 156             }
 157             else
 158             {
 159                 if (s_path.find_last_of(DIR_SEP_CHAR) > 0)
 160                 {
 161                     s_path = s_path.substr(0,s_path.find_last_of(DIR_SEP_CHAR));
 162                 }
 163             }
 164
 165             DIR *p_src_dir = vlc_opendir(s_path.c_str());
 166
 167             if (p_src_dir != NULL)
 168             {
 169                 char *psz_file;
 170                 while ((psz_file = vlc_readdir(p_src_dir)) != NULL)
 171                 {
 172                     if (strlen(psz_file) > 4)
 173                     {
 174                         s_filename = s_path + DIR_SEP_CHAR + psz_file;
 175
 176 #ifdef WIN32
 177                         if (!strcasecmp(s_filename.c_str(), p_demux->psz_file))
 178 #else
 179                         if (!s_filename.compare(p_demux->psz_file))
 180 #endif
 181                         {
 182                             free (psz_file);
 183                             continue; // don't reuse the original opened file
 184                         }
 185
 186                         if (!s_filename.compare(s_filename.length() - 3, 3, "mkv") ||
 187                             !s_filename.compare(s_filename.length() - 3, 3, "mka"))
 188                         {
 189                             // test wether this file belongs to our family
 190                             const uint8_t *p_peek;
 191                             bool          file_ok = false;
 192                             std::string   s_url = make_URI( s_filename.c_str(), "file" );
 193                             stream_t      *p_file_stream = stream_UrlNew(
 194                                                             p_demux,
 195                                                             s_url.c_str() );
 196                             /* peek the begining */
 197                             if( p_file_stream &&
 198                                 stream_Peek( p_file_stream, &p_peek, 4 ) >= 4
 199                                 && p_peek[0] == 0x1a && p_peek[1] == 0x45 &&
 200                                 p_peek[2] == 0xdf && p_peek[3] == 0xa3 ) file_ok = true;
 201
 202                             if ( file_ok )
 203                             {
 204                                 vlc_stream_io_callback *p_file_io = new vlc_stream_io_callback( p_file_stream, true );
 205                                 EbmlStream *p_estream = new EbmlStream(*p_file_io);
 206
 207                                 p_stream = p_sys->AnalyseAllSegmentsFound( p_demux, p_estream );
 208
 209                                 if ( p_stream == NULL )
 210                                 {
 211                                     msg_Dbg( p_demux, "the file '%s' will not be used", s_filename.c_str() );
 212                                     delete p_estream;
 213                                     delete p_file_io;
 214                                 }
 215                                 else
 216                                 {
 217                                     p_stream->p_io_callback = p_file_io;
 218                                     p_stream->p_estream = p_estream;
 219                                     p_sys->streams.push_back( p_stream );
 220                                 }
 221                             }
 222                             else
 223                             {
 224                                 if( p_file_stream ) {
 225                                     stream_Delete( p_file_stream );
 226                                 }
 227                                 msg_Dbg( p_demux, "the file '%s' cannot be opened", s_filename.c_str() );
 228                             }
 229                         }
 230                     }
 231                     free (psz_file);
 232                 }
 233                 closedir( p_src_dir );
 234             }
 235         }
 236
 237         p_sys->PreloadFamily( *p_segment );
 238     }
 239     else if (b_need_preload)
 240         msg_Warn( p_demux, "This file references other files, you may want to enable the preload of local directory");
 241
 242     if ( !p_sys->PreloadLinked() ||
 243          !p_sys->PreparePlayback( NULL ) )
 244     {
 245         msg_Err( p_demux, "cannot use the segment" );
 246         goto error;
 247     }
 248
 249     p_sys->InitUi();
 250
 251     return VLC_SUCCESS;
 252
 253 error:
 254     delete p_sys;
 255     return VLC_EGENERIC;
 256 }
 257
 258 /*****************************************************************************
 259  * Close: frees unused data
 260  *****************************************************************************/
 261 static void Close( vlc_object_t *p_this )
 262 {
 263     demux_t     *p_demux = (demux_t*)p_this;
 264     demux_sys_t *p_sys   = p_demux->p_sys;
 265     virtual_segment_c *p_vsegment = p_sys->p_current_segment;
 266     if( p_vsegment )
 267     {
 268         matroska_segment_c *p_segment = p_vsegment->CurrentSegment();
 269         if( p_segment )
 270             p_segment->UnSelect();
 271     }
 272
 273     delete p_sys;
 274 }
 275
 276 /*****************************************************************************
 277  * Control:
 278  *****************************************************************************/
 279 static int Control( demux_t *p_demux, int i_query, va_list args )
 280 {
 281     demux_sys_t        *p_sys = p_demux->p_sys;
 282     int64_t     *pi64, i64;
 283     double      *pf, f;
 284     int         i_skp;
 285     size_t      i_idx;
 286
 287     vlc_meta_t *p_meta;
 288     input_attachment_t ***ppp_attach;
 289     int *pi_int;
 290
 291     switch( i_query )
 292     {
 293         case DEMUX_GET_ATTACHMENTS:
 294             ppp_attach = (input_attachment_t***)va_arg( args, input_attachment_t*** );
 295             pi_int = (int*)va_arg( args, int * );
 296
 297             if( p_sys->stored_attachments.size() <= 0 )
 298                 return VLC_EGENERIC;
 299
 300             *pi_int = p_sys->stored_attachments.size();
 301             *ppp_attach = (input_attachment_t**)malloc( sizeof(input_attachment_t**) *
 302                                                         p_sys->stored_attachments.size() );
 303             if( !(*ppp_attach) )
 304                 return VLC_ENOMEM;
 305             for( size_t i = 0; i < p_sys->stored_attachments.size(); i++ )
 306             {
 307                 attachment_c *a = p_sys->stored_attachments[i];
 308                 (*ppp_attach)[i] = vlc_input_attachment_New( a->fileName(), a->mimeType(), NULL,
 309                                                              a->p_data, a->size() );
 310             }
 311             return VLC_SUCCESS;
 312
 313         case DEMUX_GET_META:
 314             p_meta = (vlc_meta_t*)va_arg( args, vlc_meta_t* );
 315             vlc_meta_Merge( p_meta, p_sys->meta );
 316             return VLC_SUCCESS;
 317
 318         case DEMUX_GET_LENGTH:
 319             pi64 = (int64_t*)va_arg( args, int64_t * );
 320             if( p_sys->f_duration > 0.0 )
 321             {
 322                 *pi64 = (int64_t)(p_sys->f_duration * 1000);
 323                 return VLC_SUCCESS;
 324             }
 325             return VLC_EGENERIC;
 326
 327         case DEMUX_GET_POSITION:
 328             pf = (double*)va_arg( args, double * );
 329             if ( p_sys->f_duration > 0.0 )
 330                 *pf = (double)(p_sys->i_pts >= p_sys->i_start_pts ? p_sys->i_pts : p_sys->i_start_pts ) / (1000.0 * p_sys->f_duration);
 331             return VLC_SUCCESS;
 332
 333         case DEMUX_SET_POSITION:
 334             f = (double)va_arg( args, double );
 335             Seek( p_demux, -1, f, NULL );
 336             return VLC_SUCCESS;
 337
 338         case DEMUX_GET_TIME:
 339             pi64 = (int64_t*)va_arg( args, int64_t * );
 340             *pi64 = p_sys->i_pts;
 341             return VLC_SUCCESS;
 342
 343         case DEMUX_GET_TITLE_INFO:
 344             if( p_sys->titles.size() > 1 || ( p_sys->titles.size() == 1 && p_sys->titles[0]->i_seekpoint > 0 ) )
 345             {
 346                 input_title_t ***ppp_title = (input_title_t***)va_arg( args, input_title_t*** );
 347                 int *pi_int    = (int*)va_arg( args, int* );
 348
 349                 *pi_int = p_sys->titles.size();
 350                 *ppp_title = (input_title_t**)malloc( sizeof( input_title_t**) * p_sys->titles.size() );
 351
 352                 for( size_t i = 0; i < p_sys->titles.size(); i++ )
 353                 {
 354                     (*ppp_title)[i] = vlc_input_title_Duplicate( p_sys->titles[i] );
 355                 }
 356                 return VLC_SUCCESS;
 357             }
 358             return VLC_EGENERIC;
 359
 360         case DEMUX_SET_TITLE:
 361             /* TODO handle editions as titles */
 362             i_idx = (int)va_arg( args, int );
 363             if( i_idx < p_sys->used_segments.size() )
 364             {
 365                 p_sys->JumpTo( *p_sys->used_segments[i_idx], NULL );
 366                 return VLC_SUCCESS;
 367             }
 368             return VLC_EGENERIC;
 369
 370         case DEMUX_SET_SEEKPOINT:
 371             i_skp = (int)va_arg( args, int );
 372
 373             // TODO change the way it works with the << & >> buttons on the UI (+1/-1 instead of a number)
 374             if( p_sys->titles.size() && i_skp < p_sys->titles[p_sys->i_current_title]->i_seekpoint)
 375             {
 376                 Seek( p_demux, (int64_t)p_sys->titles[p_sys->i_current_title]->seekpoint[i_skp]->i_time_offset, -1, NULL);
 377                 p_demux->info.i_seekpoint |= INPUT_UPDATE_SEEKPOINT;
 378                 p_demux->info.i_seekpoint = i_skp;
 379                 return VLC_SUCCESS;
 380             }
 381             return VLC_EGENERIC;
 382
 383         case DEMUX_GET_FPS:
 384             pf = (double *)va_arg( args, double * );
 385             *pf = 0.0;
 386             if( p_sys->p_current_segment && p_sys->p_current_segment->CurrentSegment() )
 387             {
 388                 const matroska_segment_c *p_segment = p_sys->p_current_segment->CurrentSegment();
 389                 for( size_t i = 0; i < p_segment->tracks.size(); i++ )
 390                 {
 391                     mkv_track_t *tk = p_segment->tracks[i];
 392                     if( tk->fmt.i_cat == VIDEO_ES && tk->fmt.video.i_frame_rate_base > 0 )
 393                     {
 394                         *pf = (double)tk->fmt.video.i_frame_rate / tk->fmt.video.i_frame_rate_base;
 395                         break;
 396                     }
 397                 }
 398             }
 399             return VLC_SUCCESS;
 400
 401         case DEMUX_SET_TIME:
 402             i64 = (int64_t) va_arg( args, int64_t );
 403             msg_Dbg(p_demux,"SET_TIME to %"PRId64, i64 );
 404             Seek( p_demux, i64, -1, NULL );
 405             return VLC_SUCCESS;
 406         default:
 407             return VLC_EGENERIC;
 408     }
 409 }
 410
 411 /* Seek */
 412 static void Seek( demux_t *p_demux, mtime_t i_date, double f_percent, virtual_chapter_c *p_chapter )
 413 {
 414     demux_sys_t        *p_sys = p_demux->p_sys;
 415     virtual_segment_c  *p_vsegment = p_sys->p_current_segment;
 416     matroska_segment_c *p_segment = p_vsegment->CurrentSegment();
 417     mtime_t            i_time_offset = 0;
 418     int64_t            i_global_position = -1;
 419
 420     int         i_index;
 421
 422     msg_Dbg( p_demux, "seek request to %"PRId64" (%f%%)", i_date, f_percent );
 423     if( i_date < 0 && f_percent < 0 )
 424     {
 425         msg_Warn( p_demux, "cannot seek nowhere!" );
 426         return;
 427     }
 428     if( f_percent > 1.0 )
 429     {
 430         msg_Warn( p_demux, "cannot seek so far!" );
 431         return;
 432     }
 433     if( p_sys->f_duration < 0 )
 434     {
 435         msg_Warn( p_demux, "cannot seek without duration!");
 436         return;
 437     }
 438
 439     /* seek without index or without date */
 440     if( f_percent >= 0 && (var_InheritBool( p_demux, "mkv-seek-percent" ) || !p_segment->b_cues || i_date < 0 ))
 441     {
 442         i_date = int64_t( f_percent * p_sys->f_duration * 1000.0 );
 443         if( !p_segment->b_cues )
 444         {
 445             int64_t i_pos = int64_t( f_percent * stream_Size( p_demux->s ) );
 446
 447             msg_Dbg( p_demux, "lengthy way of seeking for pos:%"PRId64, i_pos );
 448             for( i_index = 0; i_index < p_segment->i_index; i_index++ )
 449             {
 450                 if( p_segment->p_indexes[i_index].i_position >= i_pos &&
 451                     p_segment->p_indexes[i_index].i_time > 0 )
 452                     break;
 453             }
 454             if( i_index == p_segment->i_index )
 455                 i_index--;
 456
 457             if( p_segment->p_indexes[i_index].i_position < i_pos )
 458             {
 459                 msg_Dbg( p_demux, "no cues, seek request to global pos: %"PRId64, i_pos );
 460                 i_global_position = i_pos;
 461             }
 462         }
 463     }
 464     p_vsegment->Seek( *p_demux, i_date, i_time_offset, p_chapter, i_global_position );
 465 }
 466
 467 /* Utility function for BlockDecode */
 468 static block_t *MemToBlock( uint8_t *p_mem, size_t i_mem, size_t offset)
 469 {
 470     if( unlikely( i_mem > SIZE_MAX - offset ) )
 471         return NULL;
 472
 473     block_t *p_block = block_New( p_demux, i_mem + offset );
 474     if( likely(p_block != NULL) )
 475     {
 476         memcpy( p_block->p_buffer + offset, p_mem, i_mem );
 477     }
 478     return p_block;
 479 }
 480
 481 /* Needed by matroska_segment::Seek() and Seek */
 482 void BlockDecode( demux_t *p_demux, KaxBlock *block, KaxSimpleBlock *simpleblock,
 483                          mtime_t i_pts, mtime_t i_duration, bool f_mandatory )
 484 {
 485     demux_sys_t        *p_sys = p_demux->p_sys;
 486     matroska_segment_c *p_segment = p_sys->p_current_segment->CurrentSegment();
 487
 488     if( !p_segment ) return;
 489
 490     size_t          i_track;
 491     if( p_segment->BlockFindTrackIndex( &i_track, block, simpleblock ) )
 492     {
 493         msg_Err( p_demux, "invalid track number" );
 494         return;
 495     }
 496
 497     mkv_track_t *tk = p_segment->tracks[i_track];
 498
 499     if( tk->fmt.i_cat != NAV_ES && tk->p_es == NULL )
 500     {
 501         msg_Err( p_demux, "unknown track number" );
 502         return;
 503     }
 504     if( i_pts + i_duration < p_sys->i_start_pts && tk->fmt.i_cat == AUDIO_ES )
 505     {
 506         return; /* discard audio packets that shouldn't be rendered */
 507     }
 508
 509     if ( tk->fmt.i_cat != NAV_ES )
 510     {
 511         bool b;
 512         es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE, tk->p_es, &b );
 513
 514         if( !b )
 515         {
 516             tk->b_inited = false;
 517             return;
 518         }
 519     }
 520
 521
 522     /* First send init data */
 523     if( !tk->b_inited && tk->i_data_init > 0 )
 524     {
 525         block_t *p_init;
 526
 527         msg_Dbg( p_demux, "sending header (%d bytes)", tk->i_data_init );
 528         p_init = MemToBlock( tk->p_data_init, tk->i_data_init, 0 );
 529         if( p_init ) es_out_Send( p_demux->out, tk->p_es, p_init );
 530     }
 531     tk->b_inited = true;
 532
 533
 534     size_t frame_size = 0;
 535     size_t block_size = 0;
 536
 537     if( simpleblock != NULL )
 538         block_size = simpleblock->GetSize();
 539     else
 540         block_size = block->GetSize();
 541
 542     for( unsigned int i = 0;
 543          ( block != NULL && i < block->NumberFrames()) || ( simpleblock != NULL && i < simpleblock->NumberFrames() );
 544          i++ )
 545     {
 546         block_t *p_block;
 547         DataBuffer *data;
 548         if( simpleblock != NULL )
 549         {
 550             data = &simpleblock->GetBuffer(i);
 551             // condition when the DTS is correct (keyframe or B frame == NOT P frame)
 552             f_mandatory = simpleblock->IsDiscardable() || simpleblock->IsKeyframe();
 553         }
 554         else
 555         {
 556             data = &block->GetBuffer(i);
 557             // condition when the DTS is correct (keyframe or B frame == NOT P frame)
 558         }
 559         frame_size += data->Size();
 560         if( !data->Buffer() || data->Size() > SIZE_MAX || frame_size > block_size  )
 561         {
 562             msg_Warn( p_demux, "Cannot read frame (too long or no frame)" );
 563             break;
 564         }
 565
 566         if( tk->i_compression_type == MATROSKA_COMPRESSION_HEADER && tk->p_compression_data != NULL )
 567             p_block = MemToBlock( data->Buffer(), data->Size(), tk->p_compression_data->GetSize() );
 568         else
 569             p_block = MemToBlock( data->Buffer(), data->Size(), 0 );
 570
 571         if( p_block == NULL )
 572         {
 573             break;
 574         }
 575
 576 #if defined(HAVE_ZLIB_H)
 577         if( tk->i_compression_type == MATROSKA_COMPRESSION_ZLIB )
 578         {
 579             p_block = block_zlib_decompress( VLC_OBJECT(p_demux), p_block );
 580             if( p_block == NULL )
 581                 break;
 582         }
 583         else
 584 #endif
 585         if( tk->i_compression_type == MATROSKA_COMPRESSION_HEADER )
 586         {
 587             memcpy( p_block->p_buffer, tk->p_compression_data->GetBuffer(), tk->p_compression_data->GetSize() );
 588         }
 589
 590         if ( tk->fmt.i_cat == NAV_ES )
 591         {
 592             // TODO handle the start/stop times of this packet
 593             p_sys->p_ev->SetPci( (const pci_t *)&p_block->p_buffer[1]);
 594             block_Release( p_block );
 595             return;
 596         }
 597         // correct timestamping when B frames are used
 598         if( tk->fmt.i_cat != VIDEO_ES )
 599         {
 600             p_block->i_dts = p_block->i_pts = i_pts;
 601         }
 602         else
 603         {
 604             if( tk->b_dts_only )
 605             {
 606                 p_block->i_pts = VLC_TS_INVALID;
 607                 p_block->i_dts = i_pts;
 608             }
 609             else if( tk->b_pts_only )
 610             {
 611                 p_block->i_pts = i_pts;
 612                 p_block->i_dts = i_pts;
 613             }
 614             else
 615             {
 616                 p_block->i_pts = i_pts;
 617                 if ( f_mandatory )
 618                     p_block->i_dts = p_block->i_pts;
 619                 else
 620                     p_block->i_dts = min( i_pts, tk->i_last_dts + (mtime_t)(tk->i_default_duration >> 10));
 621             }
 622         }
 623         tk->i_last_dts = p_block->i_dts;
 624
 625 #if 0
 626 msg_Dbg( p_demux, "block i_dts: %"PRId64" / i_pts: %"PRId64, p_block->i_dts, p_block->i_pts);
 627 #endif
 628         if( strcmp( tk->psz_codec, "S_VOBSUB" ) )
 629         {
 630             p_block->i_length = i_duration * 1000;
 631         }
 632
 633         /* FIXME remove when VLC_TS_INVALID work is done */
 634         if( i == 0 || p_block->i_dts > VLC_TS_INVALID )
 635             p_block->i_dts += VLC_TS_0;
 636         if( !tk->b_dts_only && ( i == 0 || p_block->i_pts > VLC_TS_INVALID ) )
 637             p_block->i_pts += VLC_TS_0;
 638
 639         es_out_Send( p_demux->out, tk->p_es, p_block );
 640
 641         /* use time stamp only for first block */
 642         i_pts = VLC_TS_INVALID;
 643     }
 644 }
 645
 646 /*****************************************************************************
 647  * Demux: reads and demuxes data packets
 648  *****************************************************************************
 649  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 650  *****************************************************************************/
 651 static int Demux( demux_t *p_demux)
 652 {
 653     demux_sys_t        *p_sys = p_demux->p_sys;
 654
 655     vlc_mutex_lock( &p_sys->lock_demuxer );
 656
 657     virtual_segment_c  *p_vsegment = p_sys->p_current_segment;
 658     matroska_segment_c *p_segment = p_vsegment->CurrentSegment();
 659     if ( p_segment == NULL ) return 0;
 660     int                i_block_count = 0;
 661     int                i_return = 0;
 662
 663     for( ;; )
 664     {
 665         if ( p_sys->demuxer.b_die )
 666             break;
 667
 668         if( p_sys->i_pts >= p_sys->i_start_pts  )
 669             if ( p_vsegment->UpdateCurrentToChapter( *p_demux ) )
 670             {
 671                 i_return = 1;
 672                 break;
 673             }
 674
 675         if ( p_vsegment->CurrentEdition() &&
 676              p_vsegment->CurrentEdition()->b_ordered &&
 677              p_vsegment->CurrentChapter() == NULL )
 678             /* nothing left to read in this ordered edition */
 679             break;
 680
 681         KaxBlock *block;
 682         KaxSimpleBlock *simpleblock;
 683         int64_t i_block_duration = 0;
 684         bool b_key_picture;
 685         bool b_discardable_picture;
 686         if( p_segment->BlockGet( block, simpleblock, &b_key_picture, &b_discardable_picture, &i_block_duration ) )
 687         {
 688             if ( p_vsegment->CurrentEdition() && p_vsegment->CurrentEdition()->b_ordered )
 689             {
 690                 const virtual_chapter_c *p_chap = p_vsegment->CurrentChapter();
 691                 // check if there are more chapters to read
 692                 if ( p_chap != NULL )
 693                 {
 694                     /* TODO handle successive chapters with the same user_start_time/user_end_time
 695                     */
 696                     p_sys->i_pts = p_chap->i_virtual_stop_time;
 697                     p_sys->i_pts++; // trick to avoid staying on segments with no duration and no content
 698
 699                     i_return = 1;
 700                 }
 701
 702                 break;
 703             }
 704             else
 705             {
 706                 msg_Warn( p_demux, "cannot get block EOF?" );
 707                 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
 708                 break;
 709             }
 710         }
 711
 712         if( simpleblock != NULL )
 713             p_sys->i_pts = p_sys->i_chapter_time + ( simpleblock->GlobalTimecode() / (mtime_t) 1000 );
 714         else
 715             p_sys->i_pts = p_sys->i_chapter_time + ( block->GlobalTimecode() / (mtime_t) 1000 );
 716
 717         /* The blocks are in coding order so we can safely consider that only references are in chronological order */
 718         if( simpleblock == NULL || b_key_picture )
 719             es_out_Control( p_demux->out, ES_OUT_SET_PCR, VLC_TS_0 + p_sys->i_pts );
 720
 721         if( p_sys->i_pts >= p_sys->i_start_pts  )
 722         {
 723             if ( p_vsegment->UpdateCurrentToChapter( *p_demux ) )
 724             {
 725                 i_return = 1;
 726                 delete block;
 727                 break;
 728             }
 729         }
 730
 731         if ( p_vsegment->CurrentEdition() &&
 732              p_vsegment->CurrentEdition()->b_ordered &&
 733              p_vsegment->CurrentChapter() == NULL )
 734         {
 735             /* nothing left to read in this ordered edition */
 736             delete block;
 737             break;
 738         }
 739
 740         BlockDecode( p_demux, block, simpleblock, p_sys->i_pts, i_block_duration, b_key_picture || b_discardable_picture );
 741
 742         delete block;
 743         i_block_count++;
 744
 745         // TODO optimize when there is need to leave or when seeking has been called
 746         if( i_block_count > 5 )
 747         {
 748             i_return = 1;
 749             break;
 750         }
 751     }
 752
 753     vlc_mutex_unlock( &p_sys->lock_demuxer );
 754
 755     return i_return;
 756 }
 757