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 #if defined(WIN32) || defined(__OS2__)
 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 whether 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             if( p_sys->f_duration > 0.0 )
 335             {
 336                 f = (double)va_arg( args, double );
 337                 Seek( p_demux, -1, f, NULL );
 338                 return VLC_SUCCESS;
 339             }
 340             return VLC_EGENERIC;
 341
 342         case DEMUX_GET_TIME:
 343             pi64 = (int64_t*)va_arg( args, int64_t * );
 344             *pi64 = p_sys->i_pts;
 345             return VLC_SUCCESS;
 346
 347         case DEMUX_GET_TITLE_INFO:
 348             if( p_sys->titles.size() > 1 || ( p_sys->titles.size() == 1 && p_sys->titles[0]->i_seekpoint > 0 ) )
 349             {
 350                 input_title_t ***ppp_title = (input_title_t***)va_arg( args, input_title_t*** );
 351                 int *pi_int    = (int*)va_arg( args, int* );
 352
 353                 *pi_int = p_sys->titles.size();
 354                 *ppp_title = (input_title_t**)malloc( sizeof( input_title_t**) * p_sys->titles.size() );
 355
 356                 for( size_t i = 0; i < p_sys->titles.size(); i++ )
 357                 {
 358                     (*ppp_title)[i] = vlc_input_title_Duplicate( p_sys->titles[i] );
 359                 }
 360                 return VLC_SUCCESS;
 361             }
 362             return VLC_EGENERIC;
 363
 364         case DEMUX_SET_TITLE:
 365             /* TODO handle editions as titles */
 366             i_idx = (int)va_arg( args, int );
 367             if( i_idx < p_sys->used_segments.size() )
 368             {
 369                 p_sys->JumpTo( *p_sys->used_segments[i_idx], NULL );
 370                 return VLC_SUCCESS;
 371             }
 372             return VLC_EGENERIC;
 373
 374         case DEMUX_SET_SEEKPOINT:
 375             i_skp = (int)va_arg( args, int );
 376
 377             // TODO change the way it works with the << & >> buttons on the UI (+1/-1 instead of a number)
 378             if( p_sys->titles.size() && i_skp < p_sys->titles[p_sys->i_current_title]->i_seekpoint)
 379             {
 380                 Seek( p_demux, (int64_t)p_sys->titles[p_sys->i_current_title]->seekpoint[i_skp]->i_time_offset, -1, NULL);
 381                 p_demux->info.i_seekpoint |= INPUT_UPDATE_SEEKPOINT;
 382                 p_demux->info.i_seekpoint = i_skp;
 383                 return VLC_SUCCESS;
 384             }
 385             return VLC_EGENERIC;
 386
 387         case DEMUX_GET_FPS:
 388             pf = (double *)va_arg( args, double * );
 389             *pf = 0.0;
 390             if( p_sys->p_current_segment && p_sys->p_current_segment->CurrentSegment() )
 391             {
 392                 const matroska_segment_c *p_segment = p_sys->p_current_segment->CurrentSegment();
 393                 for( size_t i = 0; i < p_segment->tracks.size(); i++ )
 394                 {
 395                     mkv_track_t *tk = p_segment->tracks[i];
 396                     if( tk->fmt.i_cat == VIDEO_ES && tk->fmt.video.i_frame_rate_base > 0 )
 397                     {
 398                         *pf = (double)tk->fmt.video.i_frame_rate / tk->fmt.video.i_frame_rate_base;
 399                         break;
 400                     }
 401                 }
 402             }
 403             return VLC_SUCCESS;
 404
 405         case DEMUX_SET_TIME:
 406             i64 = (int64_t) va_arg( args, int64_t );
 407             msg_Dbg(p_demux,"SET_TIME to %"PRId64, i64 );
 408             Seek( p_demux, i64, -1, NULL );
 409             return VLC_SUCCESS;
 410         default:
 411             return VLC_EGENERIC;
 412     }
 413 }
 414
 415 /* Seek */
 416 static void Seek( demux_t *p_demux, mtime_t i_date, double f_percent, virtual_chapter_c *p_chapter )
 417 {
 418     demux_sys_t        *p_sys = p_demux->p_sys;
 419     virtual_segment_c  *p_vsegment = p_sys->p_current_segment;
 420     matroska_segment_c *p_segment = p_vsegment->CurrentSegment();
 421     mtime_t            i_time_offset = 0;
 422     int64_t            i_global_position = -1;
 423
 424     int         i_index;
 425
 426     msg_Dbg( p_demux, "seek request to %"PRId64" (%f%%)", i_date, f_percent );
 427     if( i_date < 0 && f_percent < 0 )
 428     {
 429         msg_Warn( p_demux, "cannot seek nowhere!" );
 430         return;
 431     }
 432     if( f_percent > 1.0 )
 433     {
 434         msg_Warn( p_demux, "cannot seek so far!" );
 435         return;
 436     }
 437     if( p_sys->f_duration < 0 )
 438     {
 439         msg_Warn( p_demux, "cannot seek without duration!");
 440         return;
 441     }
 442
 443     /* seek without index or without date */
 444     if( f_percent >= 0 && (var_InheritBool( p_demux, "mkv-seek-percent" ) || !p_segment->b_cues || i_date < 0 ))
 445     {
 446         i_date = int64_t( f_percent * p_sys->f_duration * 1000.0 );
 447         if( !p_segment->b_cues )
 448         {
 449             int64_t i_pos = int64_t( f_percent * stream_Size( p_demux->s ) );
 450
 451             msg_Dbg( p_demux, "lengthy way of seeking for pos:%"PRId64, i_pos );
 452             for( i_index = 0; i_index < p_segment->i_index; i_index++ )
 453             {
 454                 if( p_segment->p_indexes[i_index].i_position >= i_pos &&
 455                     p_segment->p_indexes[i_index].i_time > 0 )
 456                     break;
 457             }
 458             if( i_index == p_segment->i_index )
 459                 i_index--;
 460
 461             if( p_segment->p_indexes[i_index].i_position < i_pos )
 462             {
 463                 msg_Dbg( p_demux, "no cues, seek request to global pos: %"PRId64, i_pos );
 464                 i_global_position = i_pos;
 465             }
 466         }
 467     }
 468     p_vsegment->Seek( *p_demux, i_date, i_time_offset, p_chapter, i_global_position );
 469 }
 470
 471 /* Needed by matroska_segment::Seek() and Seek */
 472 void BlockDecode( demux_t *p_demux, KaxBlock *block, KaxSimpleBlock *simpleblock,
 473                          mtime_t i_pts, mtime_t i_duration, bool f_mandatory )
 474 {
 475     demux_sys_t        *p_sys = p_demux->p_sys;
 476     matroska_segment_c *p_segment = p_sys->p_current_segment->CurrentSegment();
 477
 478     if( !p_segment ) return;
 479
 480     size_t          i_track;
 481     if( p_segment->BlockFindTrackIndex( &i_track, block, simpleblock ) )
 482     {
 483         msg_Err( p_demux, "invalid track number" );
 484         return;
 485     }
 486
 487     mkv_track_t *tk = p_segment->tracks[i_track];
 488
 489     if( tk->fmt.i_cat != NAV_ES && tk->p_es == NULL )
 490     {
 491         msg_Err( p_demux, "unknown track number" );
 492         return;
 493     }
 494     if( i_pts + i_duration < p_sys->i_start_pts && tk->fmt.i_cat == AUDIO_ES )
 495     {
 496         return; /* discard audio packets that shouldn't be rendered */
 497     }
 498
 499     if ( tk->fmt.i_cat != NAV_ES )
 500     {
 501         bool b;
 502         es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE, tk->p_es, &b );
 503
 504         if( !b )
 505         {
 506             tk->b_inited = false;
 507             return;
 508         }
 509     }
 510
 511
 512     /* First send init data */
 513     if( !tk->b_inited && tk->i_data_init > 0 )
 514     {
 515         block_t *p_init;
 516
 517         msg_Dbg( p_demux, "sending header (%d bytes)", tk->i_data_init );
 518         p_init = MemToBlock( tk->p_data_init, tk->i_data_init, 0 );
 519         if( p_init ) es_out_Send( p_demux->out, tk->p_es, p_init );
 520     }
 521     tk->b_inited = true;
 522
 523
 524     size_t frame_size = 0;
 525     size_t block_size = 0;
 526
 527     if( simpleblock != NULL )
 528         block_size = simpleblock->GetSize();
 529     else
 530         block_size = block->GetSize();
 531
 532     for( unsigned int i = 0;
 533          ( block != NULL && i < block->NumberFrames()) || ( simpleblock != NULL && i < simpleblock->NumberFrames() );
 534          i++ )
 535     {
 536         block_t *p_block;
 537         DataBuffer *data;
 538         if( simpleblock != NULL )
 539         {
 540             data = &simpleblock->GetBuffer(i);
 541             // condition when the DTS is correct (keyframe or B frame == NOT P frame)
 542             f_mandatory = simpleblock->IsDiscardable() || simpleblock->IsKeyframe();
 543         }
 544         else
 545         {
 546             data = &block->GetBuffer(i);
 547             // condition when the DTS is correct (keyframe or B frame == NOT P frame)
 548         }
 549         frame_size += data->Size();
 550         if( !data->Buffer() || data->Size() > SIZE_MAX || frame_size > block_size  )
 551         {
 552             msg_Warn( p_demux, "Cannot read frame (too long or no frame)" );
 553             break;
 554         }
 555
 556         if( tk->i_compression_type == MATROSKA_COMPRESSION_HEADER && tk->p_compression_data != NULL )
 557             p_block = MemToBlock( data->Buffer(), data->Size(), tk->p_compression_data->GetSize() );
 558         else
 559             p_block = MemToBlock( data->Buffer(), data->Size(), 0 );
 560
 561         if( p_block == NULL )
 562         {
 563             break;
 564         }
 565
 566 #if defined(HAVE_ZLIB_H)
 567         if( tk->i_compression_type == MATROSKA_COMPRESSION_ZLIB )
 568         {
 569             p_block = block_zlib_decompress( VLC_OBJECT(p_demux), p_block );
 570             if( p_block == NULL )
 571                 break;
 572         }
 573         else
 574 #endif
 575         if( tk->i_compression_type == MATROSKA_COMPRESSION_HEADER )
 576         {
 577             memcpy( p_block->p_buffer, tk->p_compression_data->GetBuffer(), tk->p_compression_data->GetSize() );
 578         }
 579
 580         if( tk->fmt.i_codec == VLC_CODEC_COOK ||
 581             tk->fmt.i_codec == VLC_CODEC_ATRAC3 )
 582         {
 583             handle_real_audio(p_demux, tk, p_block, i_pts);
 584             block_Release(p_block);
 585             i_pts = ( tk->i_default_duration )?
 586                 i_pts + ( mtime_t )( tk->i_default_duration / 1000 ):
 587                 VLC_TS_INVALID;
 588             continue;
 589         }
 590
 591         if ( tk->fmt.i_cat == NAV_ES )
 592         {
 593             // TODO handle the start/stop times of this packet
 594             p_sys->p_ev->SetPci( (const pci_t *)&p_block->p_buffer[1]);
 595             block_Release( p_block );
 596             return;
 597         }
 598         // correct timestamping when B frames are used
 599         if( tk->fmt.i_cat != VIDEO_ES )
 600         {
 601             p_block->i_dts = p_block->i_pts = i_pts;
 602         }
 603         else
 604         {
 605             if( tk->b_dts_only )
 606             {
 607                 p_block->i_pts = VLC_TS_INVALID;
 608                 p_block->i_dts = i_pts;
 609             }
 610             else if( tk->b_pts_only )
 611             {
 612                 p_block->i_pts = i_pts;
 613                 p_block->i_dts = i_pts;
 614             }
 615             else
 616             {
 617                 p_block->i_pts = i_pts;
 618                 if ( f_mandatory )
 619                     p_block->i_dts = p_block->i_pts;
 620                 else
 621                     p_block->i_dts = min( i_pts, tk->i_last_dts + ( mtime_t )( tk->i_default_duration / 1000 ) );
 622             }
 623         }
 624         if( tk->fmt.i_cat == VIDEO_ES || tk->fmt.i_cat == AUDIO_ES )
 625             tk->i_last_dts = p_block->i_dts;
 626
 627 #if 0
 628 msg_Dbg( p_demux, "block i_dts: %"PRId64" / i_pts: %"PRId64, p_block->i_dts, p_block->i_pts);
 629 #endif
 630         if( strcmp( tk->psz_codec, "S_VOBSUB" ) )
 631         {
 632             p_block->i_length = i_duration * 1000;
 633         }
 634
 635         /* FIXME remove when VLC_TS_INVALID work is done */
 636         if( i == 0 || p_block->i_dts > VLC_TS_INVALID )
 637             p_block->i_dts += VLC_TS_0;
 638         if( !tk->b_dts_only && ( i == 0 || p_block->i_pts > VLC_TS_INVALID ) )
 639             p_block->i_pts += VLC_TS_0;
 640
 641         es_out_Send( p_demux->out, tk->p_es, p_block );
 642
 643         /* use time stamp only for first block */
 644         i_pts = ( tk->i_default_duration )?
 645                  i_pts + ( mtime_t )( tk->i_default_duration / 1000 ):
 646                  VLC_TS_INVALID;
 647     }
 648 }
 649
 650 /*****************************************************************************
 651  * Demux: reads and demuxes data packets
 652  *****************************************************************************
 653  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 654  *****************************************************************************/
 655 static int Demux( demux_t *p_demux)
 656 {
 657     demux_sys_t        *p_sys = p_demux->p_sys;
 658
 659     vlc_mutex_lock( &p_sys->lock_demuxer );
 660
 661     virtual_segment_c  *p_vsegment = p_sys->p_current_segment;
 662     matroska_segment_c *p_segment = p_vsegment->CurrentSegment();
 663     if ( p_segment == NULL ) return 0;
 664     int                i_block_count = 0;
 665     int                i_return = 0;
 666
 667     for( ;; )
 668     {
 669         if ( p_sys->demuxer.b_die )
 670             break;
 671
 672         if( p_sys->i_pts >= p_sys->i_start_pts  )
 673             if ( p_vsegment->UpdateCurrentToChapter( *p_demux ) )
 674             {
 675                 i_return = 1;
 676                 break;
 677             }
 678
 679         if ( p_vsegment->CurrentEdition() &&
 680              p_vsegment->CurrentEdition()->b_ordered &&
 681              p_vsegment->CurrentChapter() == NULL )
 682             /* nothing left to read in this ordered edition */
 683             break;
 684
 685         KaxBlock *block;
 686         KaxSimpleBlock *simpleblock;
 687         int64_t i_block_duration = 0;
 688         bool b_key_picture;
 689         bool b_discardable_picture;
 690         if( p_segment->BlockGet( block, simpleblock, &b_key_picture, &b_discardable_picture, &i_block_duration ) )
 691         {
 692             if ( p_vsegment->CurrentEdition() && p_vsegment->CurrentEdition()->b_ordered )
 693             {
 694                 const virtual_chapter_c *p_chap = p_vsegment->CurrentChapter();
 695                 // check if there are more chapters to read
 696                 if ( p_chap != NULL )
 697                 {
 698                     /* TODO handle successive chapters with the same user_start_time/user_end_time
 699                     */
 700                     p_sys->i_pts = p_chap->i_virtual_stop_time;
 701                     p_sys->i_pts++; // trick to avoid staying on segments with no duration and no content
 702
 703                     i_return = 1;
 704                 }
 705
 706                 break;
 707             }
 708             else
 709             {
 710                 msg_Warn( p_demux, "cannot get block EOF?" );
 711                 break;
 712             }
 713         }
 714
 715         if( simpleblock != NULL )
 716             p_sys->i_pts = p_sys->i_chapter_time + ( simpleblock->GlobalTimecode() / (mtime_t) 1000 );
 717         else
 718             p_sys->i_pts = p_sys->i_chapter_time + ( block->GlobalTimecode() / (mtime_t) 1000 );
 719
 720         mtime_t i_pcr = VLC_TS_INVALID;
 721         for( size_t i = 0; i < p_segment->tracks.size(); i++)
 722             if( p_segment->tracks[i]->i_last_dts > VLC_TS_INVALID &&
 723                 ( p_segment->tracks[i]->i_last_dts < i_pcr || i_pcr == VLC_TS_INVALID ))
 724                 i_pcr = p_segment->tracks[i]->i_last_dts;
 725
 726         if( i_pcr > p_sys->i_pcr + 300000 )
 727         {
 728             es_out_Control( p_demux->out, ES_OUT_SET_PCR, VLC_TS_0 + p_sys->i_pcr );
 729             p_sys->i_pcr = i_pcr;
 730         }
 731
 732         if( p_sys->i_pts >= p_sys->i_start_pts  )
 733         {
 734             if ( p_vsegment->UpdateCurrentToChapter( *p_demux ) )
 735             {
 736                 i_return = 1;
 737                 delete block;
 738                 break;
 739             }
 740         }
 741
 742         if ( p_vsegment->CurrentEdition() &&
 743              p_vsegment->CurrentEdition()->b_ordered &&
 744              p_vsegment->CurrentChapter() == NULL )
 745         {
 746             /* nothing left to read in this ordered edition */
 747             delete block;
 748             break;
 749         }
 750
 751         BlockDecode( p_demux, block, simpleblock, p_sys->i_pts, i_block_duration, b_key_picture || b_discardable_picture );
 752
 753         delete block;
 754         i_block_count++;
 755
 756         // TODO optimize when there is need to leave or when seeking has been called
 757         if( i_block_count > 5 )
 758         {
 759             i_return = 1;
 760             break;
 761         }
 762     }
 763
 764     vlc_mutex_unlock( &p_sys->lock_demuxer );
 765
 766     return i_return;
 767 }
 768