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_("Ordered chapters"),
  55             N_("Play ordered chapters as specified in the segment."), true );
  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", false,
  62             N_("Preload Directory"),
  63             N_("Preload matroska files from the same family in the same directory (not good for broken files)."), true );
  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
  96     /* peek the begining */
  97     if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC;
  98
  99     /* is a valid file */
 100     if( p_peek[0] != 0x1a || p_peek[1] != 0x45 ||
 101         p_peek[2] != 0xdf || p_peek[3] != 0xa3 ) return VLC_EGENERIC;
 102
 103     /* Set the demux function */
 104     p_demux->pf_demux   = Demux;
 105     p_demux->pf_control = Control;
 106     p_demux->p_sys      = p_sys = new demux_sys_t( *p_demux );
 107
 108     p_io_callback = new vlc_stream_io_callback( p_demux->s, false );
 109     p_io_stream = new EbmlStream( *p_io_callback );
 110
 111     if( p_io_stream == NULL )
 112     {
 113         msg_Err( p_demux, "failed to create EbmlStream" );
 114         delete p_io_callback;
 115         delete p_sys;
 116         return VLC_EGENERIC;
 117     }
 118
 119     p_stream = p_sys->AnalyseAllSegmentsFound( p_demux, p_io_stream, true );
 120     if( p_stream == NULL )
 121     {
 122         msg_Err( p_demux, "cannot find KaxSegment" );
 123         goto error;
 124     }
 125     p_sys->streams.push_back( p_stream );
 126
 127     p_stream->p_io_callback = p_io_callback;
 128     p_stream->p_estream = p_io_stream;
 129
 130     for (size_t i=0; i<p_stream->segments.size(); i++)
 131     {
 132         p_stream->segments[i]->Preload();
 133     }
 134
 135     p_segment = p_stream->segments[0];
 136     if( p_segment->cluster == NULL )
 137     {
 138         msg_Err( p_demux, "cannot find any cluster, damaged file ?" );
 139         goto error;
 140     }
 141
 142     if (var_InheritBool( p_demux, "mkv-preload-local-dir" ))
 143     {
 144         /* get the files from the same dir from the same family (based on p_demux->psz_path) */
 145         if ( p_demux->psz_file && !strcmp( p_demux->psz_access, "file" ) )
 146         {
 147             // assume it's a regular file
 148             // get the directory path
 149             s_path = p_demux->psz_file;
 150             if (s_path.at(s_path.length() - 1) == DIR_SEP_CHAR)
 151             {
 152                 s_path = s_path.substr(0,s_path.length()-1);
 153             }
 154             else
 155             {
 156                 if (s_path.find_last_of(DIR_SEP_CHAR) > 0)
 157                 {
 158                     s_path = s_path.substr(0,s_path.find_last_of(DIR_SEP_CHAR));
 159                 }
 160             }
 161
 162             DIR *p_src_dir = vlc_opendir(s_path.c_str());
 163
 164             if (p_src_dir != NULL)
 165             {
 166                 char *psz_file;
 167                 while ((psz_file = vlc_readdir(p_src_dir)) != NULL)
 168                 {
 169                     if (strlen(psz_file) > 4)
 170                     {
 171                         s_filename = s_path + DIR_SEP_CHAR + psz_file;
 172
 173 #ifdef WIN32
 174                         if (!strcasecmp(s_filename.c_str(), p_demux->psz_file))
 175 #else
 176                         if (!s_filename.compare(p_demux->psz_file))
 177 #endif
 178                         {
 179                             free (psz_file);
 180                             continue; // don't reuse the original opened file
 181                         }
 182
 183                         if (!s_filename.compare(s_filename.length() - 3, 3, "mkv") ||
 184                             !s_filename.compare(s_filename.length() - 3, 3, "mka"))
 185                         {
 186                             // test wether this file belongs to our family
 187                             const uint8_t *p_peek;
 188                             bool          file_ok = false;
 189                             std::string   s_url = make_URI( s_filename.c_str(), "file" );
 190                             stream_t      *p_file_stream = stream_UrlNew(
 191                                                             p_demux,
 192                                                             s_url.c_str() );
 193                             /* peek the begining */
 194                             if( p_file_stream &&
 195                                 stream_Peek( p_file_stream, &p_peek, 4 ) >= 4
 196                                 && p_peek[0] == 0x1a && p_peek[1] == 0x45 &&
 197                                 p_peek[2] == 0xdf && p_peek[3] == 0xa3 ) file_ok = true;
 198
 199                             if ( file_ok )
 200                             {
 201                                 vlc_stream_io_callback *p_file_io = new vlc_stream_io_callback( p_file_stream, true );
 202                                 EbmlStream *p_estream = new EbmlStream(*p_file_io);
 203
 204                                 p_stream = p_sys->AnalyseAllSegmentsFound( p_demux, p_estream );
 205
 206                                 if ( p_stream == NULL )
 207                                 {
 208                                     msg_Dbg( p_demux, "the file '%s' will not be used", s_filename.c_str() );
 209                                     delete p_estream;
 210                                     delete p_file_io;
 211                                 }
 212                                 else
 213                                 {
 214                                     p_stream->p_io_callback = p_file_io;
 215                                     p_stream->p_estream = p_estream;
 216                                     p_sys->streams.push_back( p_stream );
 217                                 }
 218                             }
 219                             else
 220                             {
 221                                 if( p_file_stream ) {
 222                                     stream_Delete( p_file_stream );
 223                                 }
 224                                 msg_Dbg( p_demux, "the file '%s' cannot be opened", s_filename.c_str() );
 225                             }
 226                         }
 227                     }
 228                     free (psz_file);
 229                 }
 230                 closedir( p_src_dir );
 231             }
 232         }
 233
 234         p_sys->PreloadFamily( *p_segment );
 235     }
 236
 237     p_sys->PreloadLinked();
 238
 239     if ( !p_sys->PreparePlayback( NULL ) )
 240     {
 241         msg_Err( p_demux, "cannot use the segment" );
 242         goto error;
 243     }
 244
 245     p_sys->InitUi();
 246
 247     return VLC_SUCCESS;
 248
 249 error:
 250     delete p_sys;
 251     return VLC_EGENERIC;
 252 }
 253
 254 /*****************************************************************************
 255  * Close: frees unused data
 256  *****************************************************************************/
 257 static void Close( vlc_object_t *p_this )
 258 {
 259     demux_t     *p_demux = (demux_t*)p_this;
 260     demux_sys_t *p_sys   = p_demux->p_sys;
 261
 262     delete p_sys;
 263 }
 264
 265 /*****************************************************************************
 266  * Control:
 267  *****************************************************************************/
 268 static int Control( demux_t *p_demux, int i_query, va_list args )
 269 {
 270     demux_sys_t        *p_sys = p_demux->p_sys;
 271     int64_t     *pi64, i64;
 272     double      *pf, f;
 273     int         i_skp;
 274     size_t      i_idx;
 275
 276     vlc_meta_t *p_meta;
 277     input_attachment_t ***ppp_attach;
 278     int *pi_int;
 279
 280     switch( i_query )
 281     {
 282         case DEMUX_GET_ATTACHMENTS:
 283             ppp_attach = (input_attachment_t***)va_arg( args, input_attachment_t*** );
 284             pi_int = (int*)va_arg( args, int * );
 285
 286             if( p_sys->stored_attachments.size() <= 0 )
 287                 return VLC_EGENERIC;
 288
 289             *pi_int = p_sys->stored_attachments.size();
 290             *ppp_attach = (input_attachment_t**)malloc( sizeof(input_attachment_t**) *
 291                                                         p_sys->stored_attachments.size() );
 292             if( !(*ppp_attach) )
 293                 return VLC_ENOMEM;
 294             for( size_t i = 0; i < p_sys->stored_attachments.size(); i++ )
 295             {
 296                 attachment_c *a = p_sys->stored_attachments[i];
 297                 (*ppp_attach)[i] = vlc_input_attachment_New( a->fileName(), a->mimeType(), NULL,
 298                                                              a->p_data, a->size() );
 299             }
 300             return VLC_SUCCESS;
 301
 302         case DEMUX_GET_META:
 303             p_meta = (vlc_meta_t*)va_arg( args, vlc_meta_t* );
 304             vlc_meta_Merge( p_meta, p_sys->meta );
 305             return VLC_SUCCESS;
 306
 307         case DEMUX_GET_LENGTH:
 308             pi64 = (int64_t*)va_arg( args, int64_t * );
 309             if( p_sys->f_duration > 0.0 )
 310             {
 311                 *pi64 = (int64_t)(p_sys->f_duration * 1000);
 312                 return VLC_SUCCESS;
 313             }
 314             return VLC_EGENERIC;
 315
 316         case DEMUX_GET_POSITION:
 317             pf = (double*)va_arg( args, double * );
 318             if ( p_sys->f_duration > 0.0 )
 319                 *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);
 320             return VLC_SUCCESS;
 321
 322         case DEMUX_SET_POSITION:
 323             f = (double)va_arg( args, double );
 324             Seek( p_demux, -1, f, NULL );
 325             return VLC_SUCCESS;
 326
 327         case DEMUX_GET_TIME:
 328             pi64 = (int64_t*)va_arg( args, int64_t * );
 329             *pi64 = p_sys->i_pts;
 330             return VLC_SUCCESS;
 331
 332         case DEMUX_GET_TITLE_INFO:
 333             if( p_sys->titles.size() > 1 || ( p_sys->titles.size() == 1 && p_sys->titles[0]->i_seekpoint > 0 ) )
 334             {
 335                 input_title_t ***ppp_title = (input_title_t***)va_arg( args, input_title_t*** );
 336                 int *pi_int    = (int*)va_arg( args, int* );
 337
 338                 *pi_int = p_sys->titles.size();
 339                 *ppp_title = (input_title_t**)malloc( sizeof( input_title_t**) * p_sys->titles.size() );
 340
 341                 for( size_t i = 0; i < p_sys->titles.size(); i++ )
 342                 {
 343                     (*ppp_title)[i] = vlc_input_title_Duplicate( p_sys->titles[i] );
 344                 }
 345                 return VLC_SUCCESS;
 346             }
 347             return VLC_EGENERIC;
 348
 349         case DEMUX_SET_TITLE:
 350             /* TODO handle editions as titles */
 351             i_idx = (int)va_arg( args, int );
 352             if( i_idx < p_sys->used_segments.size() )
 353             {
 354                 p_sys->JumpTo( *p_sys->used_segments[i_idx], NULL );
 355                 return VLC_SUCCESS;
 356             }
 357             return VLC_EGENERIC;
 358
 359         case DEMUX_SET_SEEKPOINT:
 360             i_skp = (int)va_arg( args, int );
 361
 362             // TODO change the way it works with the << & >> buttons on the UI (+1/-1 instead of a number)
 363             if( p_sys->titles.size() && i_skp < p_sys->titles[p_sys->i_current_title]->i_seekpoint)
 364             {
 365                 Seek( p_demux, (int64_t)p_sys->titles[p_sys->i_current_title]->seekpoint[i_skp]->i_time_offset, -1, NULL);
 366                 p_demux->info.i_seekpoint |= INPUT_UPDATE_SEEKPOINT;
 367                 p_demux->info.i_seekpoint = i_skp;
 368                 return VLC_SUCCESS;
 369             }
 370             return VLC_EGENERIC;
 371
 372         case DEMUX_GET_FPS:
 373             pf = (double *)va_arg( args, double * );
 374             *pf = 0.0;
 375             if( p_sys->p_current_segment && p_sys->p_current_segment->CurrentSegment() )
 376             {
 377                 const matroska_segment_c *p_segment = p_sys->p_current_segment->CurrentSegment();
 378                 for( size_t i = 0; i < p_segment->tracks.size(); i++ )
 379                 {
 380                     mkv_track_t *tk = p_segment->tracks[i];
 381                     if( tk->fmt.i_cat == VIDEO_ES && tk->fmt.video.i_frame_rate_base > 0 )
 382                     {
 383                         *pf = (double)tk->fmt.video.i_frame_rate / tk->fmt.video.i_frame_rate_base;
 384                         break;
 385                     }
 386                 }
 387             }
 388             return VLC_SUCCESS;
 389
 390         case DEMUX_SET_TIME:
 391             i64 = (int64_t) va_arg( args, int64_t );
 392             msg_Dbg(p_demux,"SET_TIME to %"PRId64, i64 );
 393             Seek( p_demux, i64, -1, NULL );
 394             return VLC_SUCCESS;
 395         default:
 396             return VLC_EGENERIC;
 397     }
 398 }
 399
 400 /* Seek */
 401 static void Seek( demux_t *p_demux, mtime_t i_date, double f_percent, virtual_chapter_c *p_chapter )
 402 {
 403     demux_sys_t        *p_sys = p_demux->p_sys;
 404     virtual_segment_c  *p_vsegment = p_sys->p_current_segment;
 405     matroska_segment_c *p_segment = p_vsegment->CurrentSegment();
 406     mtime_t            i_time_offset = 0;
 407     int64_t            i_global_position = -1;
 408
 409     int         i_index;
 410
 411     msg_Dbg( p_demux, "seek request to %"PRId64" (%f%%)", i_date, f_percent );
 412     if( i_date < 0 && f_percent < 0 )
 413     {
 414         msg_Warn( p_demux, "cannot seek nowhere !" );
 415         return;
 416     }
 417     if( f_percent > 1.0 )
 418     {
 419         msg_Warn( p_demux, "cannot seek so far !" );
 420         return;
 421     }
 422
 423     /* seek without index or without date */
 424     if( f_percent >= 0 && (var_InheritBool( p_demux, "mkv-seek-percent" ) || !p_segment->b_cues || i_date < 0 ))
 425     {
 426         if( p_sys->f_duration >= 0 && p_segment->b_cues )
 427         {
 428             i_date = int64_t( f_percent * p_sys->f_duration * 1000.0 );
 429         }
 430         else
 431         {
 432             int64_t i_pos = int64_t( f_percent * stream_Size( p_demux->s ) );
 433
 434             msg_Dbg( p_demux, "inaccurate way of seeking for pos:%"PRId64, i_pos );
 435             for( i_index = 0; i_index < p_segment->i_index; i_index++ )
 436             {
 437                 if( p_segment->b_cues && p_segment->p_indexes[i_index].i_position < i_pos )
 438                     break;
 439                 if( !p_segment->b_cues && p_segment->p_indexes[i_index].i_position >= i_pos && p_segment->p_indexes[i_index].i_time > 0 )
 440                     break;
 441             }
 442             if( i_index == p_segment->i_index )
 443             {
 444                 i_index--;
 445             }
 446
 447             i_date = p_segment->p_indexes[i_index].i_time;
 448
 449             if( !p_segment->b_cues && ( p_segment->p_indexes[i_index].i_position < i_pos || p_segment->p_indexes[i_index].i_position - i_pos > 2000000 ))
 450             {
 451                 msg_Dbg( p_demux, "no cues, seek request to global pos: %"PRId64, i_pos );
 452                 i_global_position = i_pos;
 453             }
 454         }
 455     }
 456
 457     p_vsegment->Seek( *p_demux, i_date, i_time_offset, p_chapter, i_global_position );
 458 }
 459
 460 /* Utility function for BlockDecode */
 461 static block_t *MemToBlock( uint8_t *p_mem, size_t i_mem, size_t offset)
 462 {
 463     block_t *p_block = block_New( p_demux, i_mem + offset );
 464     if( likely(p_block != NULL) )
 465     {
 466         memcpy( p_block->p_buffer + offset, p_mem, i_mem );
 467     }
 468     return p_block;
 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     for( unsigned int i = 0;
 525          ( block != NULL && i < block->NumberFrames()) || ( simpleblock != NULL && i < simpleblock->NumberFrames() );
 526          i++ )
 527     {
 528         block_t *p_block;
 529         DataBuffer *data;
 530         if( simpleblock != NULL )
 531         {
 532             data = &simpleblock->GetBuffer(i);
 533             // condition when the DTS is correct (keyframe or B frame == NOT P frame)
 534             f_mandatory = simpleblock->IsDiscardable() || simpleblock->IsKeyframe();
 535         }
 536         else
 537         {
 538             data = &block->GetBuffer(i);
 539         }
 540         if( !data->Buffer() || data->Size() > SIZE_MAX )
 541             break;
 542
 543         if( tk->i_compression_type == MATROSKA_COMPRESSION_HEADER && tk->p_compression_data != NULL )
 544             p_block = MemToBlock( data->Buffer(), data->Size(), tk->p_compression_data->GetSize() );
 545         else
 546             p_block = MemToBlock( data->Buffer(), data->Size(), 0 );
 547
 548         if( p_block == NULL )
 549         {
 550             break;
 551         }
 552
 553 #if defined(HAVE_ZLIB_H)
 554         if( tk->i_compression_type == MATROSKA_COMPRESSION_ZLIB )
 555         {
 556             p_block = block_zlib_decompress( VLC_OBJECT(p_demux), p_block );
 557             if( p_block == NULL )
 558                 break;
 559         }
 560         else
 561 #endif
 562         if( tk->i_compression_type == MATROSKA_COMPRESSION_HEADER )
 563         {
 564             memcpy( p_block->p_buffer, tk->p_compression_data->GetBuffer(), tk->p_compression_data->GetSize() );
 565         }
 566
 567         if ( tk->fmt.i_cat == NAV_ES )
 568         {
 569             // TODO handle the start/stop times of this packet
 570             p_sys->p_ev->SetPci( (const pci_t *)&p_block->p_buffer[1]);
 571             block_Release( p_block );
 572             return;
 573         }
 574         // correct timestamping when B frames are used
 575         if( tk->fmt.i_cat != VIDEO_ES )
 576         {
 577             p_block->i_dts = p_block->i_pts = i_pts;
 578         }
 579         else
 580         {
 581             if( tk->b_dts_only )
 582             {
 583                 p_block->i_pts = VLC_TS_INVALID;
 584                 p_block->i_dts = i_pts;
 585             }
 586             else if( tk->b_pts_only )
 587             {
 588                 p_block->i_pts = i_pts;
 589                 p_block->i_dts = i_pts;
 590             }
 591             else
 592             {
 593                 p_block->i_pts = i_pts;
 594                 if ( f_mandatory )
 595                     p_block->i_dts = p_block->i_pts;
 596                 else
 597                     p_block->i_dts = min( i_pts, tk->i_last_dts + (mtime_t)(tk->i_default_duration >> 10));
 598             }
 599         }
 600         tk->i_last_dts = p_block->i_dts;
 601
 602 #if 0
 603 msg_Dbg( p_demux, "block i_dts: %"PRId64" / i_pts: %"PRId64, p_block->i_dts, p_block->i_pts);
 604 #endif
 605         if( strcmp( tk->psz_codec, "S_VOBSUB" ) )
 606         {
 607             p_block->i_length = i_duration * 1000;
 608         }
 609
 610         /* FIXME remove when VLC_TS_INVALID work is done */
 611         if( i == 0 || p_block->i_dts > VLC_TS_INVALID )
 612             p_block->i_dts += VLC_TS_0;
 613         if( !tk->b_dts_only && ( i == 0 || p_block->i_pts > VLC_TS_INVALID ) )
 614             p_block->i_pts += VLC_TS_0;
 615
 616         es_out_Send( p_demux->out, tk->p_es, p_block );
 617
 618         /* use time stamp only for first block */
 619         i_pts = VLC_TS_INVALID;
 620     }
 621 }
 622
 623 /*****************************************************************************
 624  * Demux: reads and demuxes data packets
 625  *****************************************************************************
 626  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 627  *****************************************************************************/
 628 static int Demux( demux_t *p_demux)
 629 {
 630     demux_sys_t        *p_sys = p_demux->p_sys;
 631
 632     vlc_mutex_lock( &p_sys->lock_demuxer );
 633
 634     virtual_segment_c  *p_vsegment = p_sys->p_current_segment;
 635     matroska_segment_c *p_segment = p_vsegment->CurrentSegment();
 636     if ( p_segment == NULL ) return 0;
 637     int                i_block_count = 0;
 638     int                i_return = 0;
 639
 640     for( ;; )
 641     {
 642         if ( p_sys->demuxer.b_die )
 643             break;
 644
 645         if( p_sys->i_pts >= p_sys->i_start_pts  )
 646             if ( p_vsegment->UpdateCurrentToChapter( *p_demux ) )
 647             {
 648                 i_return = 1;
 649                 break;
 650             }
 651
 652         if ( p_vsegment->CurrentEdition() &&
 653              p_vsegment->CurrentEdition()->b_ordered &&
 654              p_vsegment->CurrentChapter() == NULL )
 655             /* nothing left to read in this ordered edition */
 656             break;
 657
 658         KaxBlock *block;
 659         KaxSimpleBlock *simpleblock;
 660         int64_t i_block_duration = 0;
 661         bool b_key_picture;
 662         bool b_discardable_picture;
 663         if( p_segment->BlockGet( block, simpleblock, &b_key_picture, &b_discardable_picture, &i_block_duration ) )
 664         {
 665             if ( p_vsegment->CurrentEdition() && p_vsegment->CurrentEdition()->b_ordered )
 666             {
 667                 const virtual_chapter_c *p_chap = p_vsegment->CurrentChapter();
 668                 // check if there are more chapters to read
 669                 if ( p_chap != NULL )
 670                 {
 671                     /* TODO handle successive chapters with the same user_start_time/user_end_time
 672                     */
 673                     p_sys->i_pts = p_chap->i_virtual_stop_time;
 674                     p_sys->i_pts++; // trick to avoid staying on segments with no duration and no content
 675
 676                     i_return = 1;
 677                 }
 678
 679                 break;
 680             }
 681             else
 682             {
 683                 msg_Warn( p_demux, "cannot get block EOF?" );
 684                 p_segment->UnSelect();
 685
 686                 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
 687                 break;
 688             }
 689         }
 690
 691         if( simpleblock != NULL )
 692             p_sys->i_pts = p_sys->i_chapter_time + ( simpleblock->GlobalTimecode() / (mtime_t) 1000 );
 693         else
 694             p_sys->i_pts = p_sys->i_chapter_time + ( block->GlobalTimecode() / (mtime_t) 1000 );
 695
 696         /* The blocks are in coding order so we can safely consider that only references are in chronological order */
 697         if( simpleblock == NULL || b_key_picture )
 698             es_out_Control( p_demux->out, ES_OUT_SET_PCR, VLC_TS_0 + p_sys->i_pts );
 699
 700         if( p_sys->i_pts >= p_sys->i_start_pts  )
 701         {
 702             if ( p_vsegment->UpdateCurrentToChapter( *p_demux ) )
 703             {
 704                 i_return = 1;
 705                 delete block;
 706                 break;
 707             }
 708         }
 709
 710         if ( p_vsegment->CurrentEdition() &&
 711              p_vsegment->CurrentEdition()->b_ordered &&
 712              p_vsegment->CurrentChapter() == NULL )
 713         {
 714             /* nothing left to read in this ordered edition */
 715             delete block;
 716             break;
 717         }
 718
 719         BlockDecode( p_demux, block, simpleblock, p_sys->i_pts, i_block_duration, b_key_picture || b_discardable_picture );
 720
 721         delete block;
 722         i_block_count++;
 723
 724         // TODO optimize when there is need to leave or when seeking has been called
 725         if( i_block_count > 5 )
 726         {
 727             i_return = 1;
 728             break;
 729         }
 730     }
 731
 732     vlc_mutex_unlock( &p_sys->lock_demuxer );
 733
 734     return i_return;
 735 }
 736