git.sesse.net Git - vlc/blob - modules/access/dvdread.c

   1 /*****************************************************************************
   2  * dvdread.c : DvdRead input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2001-2004 VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Stéphane Borel <stef@via.ecp.fr>
   8  *          Gildas Bazin <gbazin@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <stdio.h>
  29 #include <stdlib.h>                                      /* malloc(), free() */
  30 #include <string.h>                                              /* strdup() */
  31
  32 #include <vlc/vlc.h>
  33 #include <vlc/input.h>
  34
  35 #include "iso_lang.h"
  36
  37 #include "../demux/ps.h"
  38
  39 #ifdef HAVE_UNISTD_H
  40 #   include <unistd.h>
  41 #endif
  42
  43 #include <fcntl.h>
  44 #include <sys/types.h>
  45 #include <sys/stat.h>
  46 #include <string.h>
  47
  48 #include <dvdread/dvd_reader.h>
  49 #include <dvdread/ifo_types.h>
  50 #include <dvdread/ifo_read.h>
  51 #include <dvdread/nav_read.h>
  52 #include <dvdread/nav_print.h>
  53
  54 /*****************************************************************************
  55  * Module descriptor
  56  *****************************************************************************/
  57 #define CACHING_TEXT N_("caching value in ms")
  58 #define CACHING_LONGTEXT N_( \
  59     "Allows you to modify the default caching value for DVDread streams. " \
  60     "This value should be set in millisecond units." )
  61
  62 #define CSSMETHOD_TEXT N_("Method used by libdvdcss for decryption")
  63 #define CSSMETHOD_LONGTEXT N_( \
  64     "Set the method used by libdvdcss for key decryption.\n" \
  65     "title: decrypted title key is guessed from the encrypted sectors of " \
  66            "the stream. Thus it should work with a file as well as the " \
  67            "DVD device. But it sometimes takes much time to decrypt a title " \
  68            "key and may even fail. With this method, the key is only checked "\
  69            "at the beginning of each title, so it won't work if the key " \
  70            "changes in the middle of a title.\n" \
  71     "disc: the disc key is first cracked, then all title keys can be " \
  72            "decrypted instantly, which allows us to check them often.\n" \
  73     "key: the same as \"disc\" if you don't have a file with player keys " \
  74            "at compilation time. If you do, the decryption of the disc key " \
  75            "will be faster with this method. It is the one that was used by " \
  76            "libcss.\n" \
  77     "The default method is: key.")
  78
  79 static char *psz_css_list[] = { "title", "disc", "key" };
  80 static char *psz_css_list_text[] = { N_("title"), N_("Disc"), N_("Key") };
  81
  82 static int  Open ( vlc_object_t * );
  83 static void Close( vlc_object_t * );
  84
  85 vlc_module_begin();
  86     set_description( _("DVDRead Input") );
  87     add_integer( "dvdread-caching", DEFAULT_PTS_DELAY / 1000, NULL,
  88         CACHING_TEXT, CACHING_LONGTEXT, VLC_TRUE );
  89     add_string( "dvdread-css-method", NULL, NULL, CSSMETHOD_TEXT,
  90                 CSSMETHOD_LONGTEXT, VLC_TRUE );
  91         change_string_list( psz_css_list, psz_css_list_text, 0 );
  92     set_capability( "access_demux", 0 );
  93     add_shortcut( "dvd" );
  94     add_shortcut( "dvdread" );
  95     set_callbacks( Open, Close );
  96 vlc_module_end();
  97
  98 /* how many blocks DVDRead will read in each loop */
  99 #define DVD_BLOCK_READ_ONCE 64
 100
 101 /*****************************************************************************
 102  * Local prototypes
 103  *****************************************************************************/
 104
 105 struct demux_sys_t
 106 {
 107     /* DVDRead state */
 108     dvd_reader_t *p_dvdread;
 109     dvd_file_t   *p_title;
 110
 111     ifo_handle_t *p_vmg_file;
 112     ifo_handle_t *p_vts_file;
 113
 114     unsigned int i_title;
 115     unsigned int i_chapter, i_chapters;
 116     unsigned int i_angle, i_angles;
 117
 118     tt_srpt_t    *p_tt_srpt;
 119     pgc_t        *p_cur_pgc;
 120
 121     dsi_t        dsi_pack;
 122
 123     int          i_ttn;
 124
 125     unsigned int i_pack_len;
 126     unsigned int i_cur_block;
 127     unsigned int i_next_vobu;
 128
 129     /* Current title start/end blocks */
 130     unsigned int i_title_start_block;
 131     unsigned int i_title_end_block;
 132     unsigned int i_title_blocks;
 133     unsigned int i_title_offset;
 134
 135     unsigned int i_title_start_cell;
 136     unsigned int i_cur_cell;
 137     unsigned int i_next_cell;
 138
 139     /* track */
 140     ps_track_t  tk[PS_TK_COUNT];
 141
 142     /* for spu variables */
 143     input_thread_t *p_input;
 144
 145     /* FIXME */
 146     uint8_t     alpha[4];
 147     uint32_t    clut[16];
 148
 149     /* */
 150     int i_aspect;
 151
 152     int           i_titles;
 153     input_title_t **titles;
 154 };
 155
 156 static char *ParseCL( vlc_object_t *, char *, vlc_bool_t, int *, int *, int *);
 157
 158 static int Control   ( demux_t *, int, va_list );
 159 static int Demux     ( demux_t * );
 160 static int DemuxBlock( demux_t *, uint8_t *, int );
 161
 162 enum
 163 {
 164     AR_SQUARE_PICTURE = 1,                          /* square pixels */
 165     AR_3_4_PICTURE    = 2,                       /* 3:4 picture (TV) */
 166     AR_16_9_PICTURE   = 3,             /* 16:9 picture (wide screen) */
 167     AR_221_1_PICTURE  = 4,                 /* 2.21:1 picture (movie) */
 168 };
 169
 170 static void DemuxTitles( demux_t *, int *, int *, int * );
 171 static void ESNew( demux_t *, int, int );
 172
 173 static int  DvdReadSetArea  ( demux_t *, int, int, int );
 174 static void DvdReadSeek     ( demux_t *, int );
 175 static void DvdReadHandleDSI( demux_t *, uint8_t * );
 176 static void DvdReadFindCell ( demux_t * );
 177
 178 /*****************************************************************************
 179  * Open:
 180  *****************************************************************************/
 181 static int Open( vlc_object_t *p_this )
 182 {
 183     demux_t      *p_demux = (demux_t*)p_this;
 184     demux_sys_t  *p_sys;
 185     int          i_title, i_chapter, i_angle;
 186     char         *psz_name;
 187     char         *psz_dvdcss_env;
 188     dvd_reader_t *p_dvdread;
 189     ifo_handle_t *p_vmg_file;
 190
 191     psz_name = ParseCL( VLC_OBJECT(p_demux), p_demux->psz_path, VLC_TRUE,
 192                         &i_title, &i_chapter, &i_angle );
 193     if( !psz_name )
 194     {
 195         return VLC_EGENERIC;
 196     }
 197
 198     /* Override environment variable DVDCSS_METHOD with config option
 199      * (FIXME: this creates a small memory leak) */
 200     psz_dvdcss_env = config_GetPsz( p_demux, "dvdread-css-method" );
 201     if( psz_dvdcss_env && *psz_dvdcss_env )
 202     {
 203         char *psz_env;
 204
 205         psz_env = malloc( strlen("DVDCSS_METHOD=") +
 206                           strlen( psz_dvdcss_env ) + 1 );
 207
 208         if( !psz_env )
 209         {
 210             free( psz_dvdcss_env );
 211             return VLC_ENOMEM;
 212         }
 213
 214         sprintf( psz_env, "%s%s", "DVDCSS_METHOD=", psz_dvdcss_env );
 215
 216         putenv( psz_env );
 217     }
 218     if( psz_dvdcss_env ) free( psz_dvdcss_env );
 219
 220     /* Open dvdread */
 221     if( !(p_dvdread = DVDOpen( psz_name )) )
 222     {
 223         msg_Err( p_demux, "DVDRead cannot open source: %s", psz_name );
 224         free( psz_name );
 225         return VLC_EGENERIC;
 226     }
 227     free( psz_name );
 228
 229     /* Ifo allocation & initialisation */
 230     if( !( p_vmg_file = ifoOpen( p_dvdread, 0 ) ) )
 231     {
 232         msg_Warn( p_demux, "cannot open VMG info" );
 233         return VLC_EGENERIC;
 234     }
 235     msg_Dbg( p_demux, "VMG opened" );
 236
 237     /* Fill p_demux field */
 238     p_demux->pf_demux = Demux;
 239     p_demux->pf_control = Control;
 240     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 241     memset( p_sys, 0, sizeof( demux_sys_t ) );
 242
 243     ps_track_init( p_sys->tk );
 244     p_sys->i_aspect = -1;
 245
 246     p_sys->p_dvdread = p_dvdread;
 247     p_sys->p_vmg_file = p_vmg_file;
 248     p_sys->p_title = NULL;
 249     p_sys->p_vts_file = NULL;
 250
 251     p_sys->i_title = p_sys->i_chapter = -1;
 252     p_sys->i_angle = i_angle;
 253
 254     DemuxTitles( p_demux, &i_title, &i_chapter, &i_angle );
 255
 256     DvdReadSetArea( p_demux, i_title - 1, i_chapter, i_angle );
 257
 258     /* Update default_pts to a suitable value for dvdread access */
 259     var_Create( p_demux, "dvdread-caching",
 260                 VLC_VAR_INTEGER|VLC_VAR_DOINHERIT );
 261
 262     return VLC_SUCCESS;
 263 }
 264
 265 /*****************************************************************************
 266  * Close:
 267  *****************************************************************************/
 268 static void Close( vlc_object_t *p_this )
 269 {
 270     demux_t     *p_demux = (demux_t*)p_this;
 271     demux_sys_t *p_sys = p_demux->p_sys;
 272     int i;
 273
 274     for( i = 0; i < PS_TK_COUNT; i++ )
 275     {
 276         ps_track_t *tk = &p_sys->tk[i];
 277         if( tk->b_seen )
 278         {
 279             es_format_Clean( &tk->fmt );
 280             if( tk->es ) es_out_Del( p_demux->out, tk->es );
 281         }
 282     }
 283
 284     /* Close libdvdread */
 285     if( p_sys->p_title ) DVDCloseFile( p_sys->p_title );
 286     if( p_sys->p_vts_file ) ifoClose( p_sys->p_vts_file );
 287     if( p_sys->p_vmg_file ) ifoClose( p_sys->p_vmg_file );
 288     DVDClose( p_sys->p_dvdread );
 289
 290     free( p_sys );
 291 }
 292
 293 /*****************************************************************************
 294  * Control:
 295  *****************************************************************************/
 296 static int Control( demux_t *p_demux, int i_query, va_list args )
 297 {
 298     demux_sys_t *p_sys = p_demux->p_sys;
 299     double f, *pf;
 300     vlc_bool_t *pb;
 301     int64_t *pi64;
 302     input_title_t ***ppp_title;
 303     int *pi_int;
 304     int i;
 305
 306     switch( i_query )
 307     {
 308         case DEMUX_GET_POSITION:
 309         {
 310             pf = (double*) va_arg( args, double* );
 311
 312             if( p_sys->i_title_blocks > 0 )
 313                 *pf = (double)p_sys->i_title_offset / p_sys->i_title_blocks;
 314             else
 315                 *pf = 0.0;
 316
 317             return VLC_SUCCESS;
 318         }
 319         case DEMUX_SET_POSITION:
 320         {
 321             f = (double)va_arg( args, double );
 322
 323             DvdReadSeek( p_demux, f * p_sys->i_title_blocks );
 324
 325             return VLC_SUCCESS;
 326         }
 327
 328         /* Special for access_demux */
 329         case DEMUX_CAN_PAUSE:
 330         case DEMUX_CAN_CONTROL_PACE:
 331             /* TODO */
 332             pb = (vlc_bool_t*)va_arg( args, vlc_bool_t * );
 333             *pb = VLC_TRUE;
 334             return VLC_SUCCESS;
 335
 336         case DEMUX_SET_PAUSE_STATE:
 337             return VLC_SUCCESS;
 338
 339         case DEMUX_GET_TITLE_INFO:
 340             ppp_title = (input_title_t***)va_arg( args, input_title_t*** );
 341             pi_int    = (int*)va_arg( args, int* );
 342
 343             /* Duplicate title infos */
 344             *pi_int = p_sys->i_titles;
 345             *ppp_title = malloc( sizeof(input_title_t **) * p_sys->i_titles );
 346             for( i = 0; i < p_sys->i_titles; i++ )
 347             {
 348                 (*ppp_title)[i] = vlc_input_title_Duplicate(p_sys->titles[i]);
 349             }
 350             return VLC_SUCCESS;
 351
 352         case DEMUX_SET_TITLE:
 353             i = (int)va_arg( args, int );
 354             if( DvdReadSetArea( p_demux, i, 0, -1 ) != VLC_SUCCESS )
 355             {
 356                 msg_Warn( p_demux, "cannot set title/chapter" );
 357                 return VLC_EGENERIC;
 358             }
 359             p_demux->info.i_update |=
 360                 INPUT_UPDATE_TITLE | INPUT_UPDATE_SEEKPOINT;
 361             p_demux->info.i_title = i;
 362             p_demux->info.i_seekpoint = 0;
 363             return VLC_SUCCESS;
 364
 365         case DEMUX_SET_SEEKPOINT:
 366             i = (int)va_arg( args, int );
 367             if( DvdReadSetArea( p_demux, -1, i, -1 ) != VLC_SUCCESS )
 368             {
 369                 msg_Warn( p_demux, "cannot set title/chapter" );
 370                 return VLC_EGENERIC;
 371             }
 372             p_demux->info.i_update |= INPUT_UPDATE_SEEKPOINT;
 373             p_demux->info.i_seekpoint = i;
 374             return VLC_SUCCESS;
 375
 376         case DEMUX_GET_PTS_DELAY:
 377             pi64 = (int64_t*)va_arg( args, int64_t * );
 378             *pi64 = (int64_t)var_GetInteger( p_demux, "dvdread-caching" )*1000;
 379             return VLC_SUCCESS;
 380
 381         /* TODO implement others */
 382         default:
 383             return VLC_EGENERIC;
 384     }
 385 }
 386
 387 /*****************************************************************************
 388  * Demux:
 389  *****************************************************************************/
 390 static int Demux( demux_t *p_demux )
 391 {
 392     demux_sys_t *p_sys = p_demux->p_sys;
 393
 394     uint8_t p_buffer[DVD_VIDEO_LB_LEN * DVD_BLOCK_READ_ONCE];
 395     int i_blocks_once, i_read;
 396     int i;
 397
 398     /*
 399      * Playback by cell in this pgc, starting at the cell for our chapter.
 400      */
 401
 402     /*
 403      * Check end of pack, and select the following one
 404      */
 405     if( !p_sys->i_pack_len )
 406     {
 407         /* Read NAV packet */
 408         if( DVDReadBlocks( p_sys->p_title, p_sys->i_next_vobu,
 409                            1, p_buffer ) != 1 )
 410         {
 411             msg_Err( p_demux, "read failed for block %d", p_sys->i_next_vobu );
 412             return -1;
 413         }
 414
 415         /* Basic check to be sure we don't have a empty title
 416          * go to next title if so */
 417         //assert( p_buffer[41] == 0xbf && p_buffer[1027] == 0xbf );
 418
 419         /* Parse the contained dsi packet */
 420         DvdReadHandleDSI( p_demux, p_buffer );
 421
 422         /* End of title */
 423         if( p_sys->i_next_vobu > p_sys->i_title_end_block )
 424         {
 425             if( p_sys->i_title + 1 >= p_sys->i_titles ) return 0; /* EOF */
 426
 427             DvdReadSetArea( p_demux, p_sys->i_title + 1, 0, -1 );
 428         }
 429
 430         if( p_sys->i_pack_len <= 0 )
 431         {
 432             msg_Err( p_demux, "i_pack_len <= 0. This shouldn't happen!" );
 433             return 0; /* EOF */
 434         }
 435
 436         /* FIXME: Ugly kludge: we send the pack block to the input for it
 437          * sometimes has a zero scr and restart the sync */
 438         p_sys->i_cur_block++;
 439         p_sys->i_title_offset++;
 440
 441         DemuxBlock( p_demux, p_buffer, DVD_VIDEO_LB_LEN );
 442     }
 443
 444     if( p_sys->i_cur_block > p_sys->i_title_end_block )
 445     {
 446         if( p_sys->i_title + 1 >= p_sys->i_titles ) return 0; /* EOF */
 447
 448         DvdReadSetArea( p_demux, p_sys->i_title + 1, 0, -1 );
 449     }
 450
 451     /*
 452      * Read actual data
 453      */
 454     i_blocks_once = __MIN( p_sys->i_pack_len, DVD_BLOCK_READ_ONCE );
 455     p_sys->i_pack_len -= i_blocks_once;
 456
 457     /* Reads from DVD */
 458     i_read = DVDReadBlocks( p_sys->p_title, p_sys->i_cur_block,
 459                             i_blocks_once, p_buffer );
 460     if( i_read != i_blocks_once )
 461     {
 462         msg_Err( p_demux, "read failed for %d/%d blocks at 0x%02x",
 463                  i_read, i_blocks_once, p_sys->i_cur_block );
 464         return -1;
 465     }
 466
 467     p_sys->i_cur_block += i_read;
 468     p_sys->i_title_offset += i_read;
 469
 470 #if 0
 471     msg_Dbg( p_demux, "i_blocks: %d len: %d current: 0x%02x",
 472              i_read, p_sys->i_pack_len, p_sys->i_cur_block );
 473 #endif
 474
 475     for( i = 0; i < i_read; i++ )
 476     {
 477         DemuxBlock( p_demux, p_buffer + i * DVD_VIDEO_LB_LEN,
 478                     DVD_VIDEO_LB_LEN );
 479     }
 480
 481 #undef p_pgc
 482
 483     return 1;
 484 }
 485
 486 /*****************************************************************************
 487  * DemuxBlock: demux a given block
 488  *****************************************************************************/
 489 static int DemuxBlock( demux_t *p_demux, uint8_t *pkt, int i_pkt )
 490 {
 491     demux_sys_t *p_sys = p_demux->p_sys;
 492     uint8_t     *p = pkt;
 493
 494     while( p < &pkt[i_pkt] )
 495     {
 496         int i_size = ps_pkt_size( p, &pkt[i_pkt] - p );
 497         block_t *p_pkt;
 498         if( i_size <= 0 )
 499         {
 500             break;
 501         }
 502
 503         /* Create a block */
 504         p_pkt = block_New( p_demux, i_size );
 505         memcpy( p_pkt->p_buffer, p, i_size);
 506
 507         /* Parse it and send it */
 508         switch( 0x100 | p[3] )
 509         {
 510         case 0x1b9:
 511         case 0x1bb:
 512         case 0x1bc:
 513
 514 #ifdef DVDREAD_DEBUG
 515             if( p[3] == 0xbc )
 516             {
 517                 msg_Warn( p_demux, "received a PSM packet" );
 518             }
 519             else if( p[3] == 0xbb )
 520             {
 521                 msg_Warn( p_demux, "received a SYSTEM packet" );
 522             }
 523 #endif
 524             block_Release( p_pkt );
 525             break;
 526
 527         case 0x1ba:
 528         {
 529             int64_t i_scr;
 530             int i_mux_rate;
 531             if( !ps_pkt_parse_pack( p_pkt, &i_scr, &i_mux_rate ) )
 532             {
 533                 es_out_Control( p_demux->out, ES_OUT_SET_PCR, i_scr );
 534             }
 535             block_Release( p_pkt );
 536             break;
 537         }
 538         default:
 539         {
 540             int i_id = ps_pkt_id( p_pkt );
 541             if( i_id >= 0xc0 )
 542             {
 543                 ps_track_t *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
 544
 545                 if( !tk->b_seen )
 546                 {
 547                     ESNew( p_demux, i_id, 0 );
 548                 }
 549                 if( tk->b_seen && tk->es &&
 550                     !ps_pkt_parse_pes( p_pkt, tk->i_skip ) )
 551                 {
 552                     es_out_Send( p_demux->out, tk->es, p_pkt );
 553                 }
 554                 else
 555                 {
 556                     block_Release( p_pkt );
 557                 }
 558             }
 559             else
 560             {
 561                 block_Release( p_pkt );
 562             }
 563             break;
 564         }
 565         }
 566
 567         p += i_size;
 568     }
 569
 570     return VLC_SUCCESS;
 571 }
 572
 573 /*****************************************************************************
 574  * ESNew: register a new elementary stream
 575  *****************************************************************************/
 576 static void ESNew( demux_t *p_demux, int i_id, int i_lang )
 577 {
 578     demux_sys_t *p_sys = p_demux->p_sys;
 579     ps_track_t  *tk = &p_sys->tk[PS_ID_TO_TK(i_id)];
 580     char psz_language[3];
 581
 582     if( tk->b_seen ) return;
 583
 584     if( ps_track_fill( tk, i_id ) )
 585     {
 586         msg_Warn( p_demux, "unknown codec for id=0x%x", i_id );
 587         return;
 588     }
 589
 590     psz_language[0] = psz_language[1] = psz_language[2] = 0;
 591     if( i_lang && i_lang != 0xffff )
 592     {
 593         psz_language[0] = (i_lang >> 8)&0xff;
 594         psz_language[1] = (i_lang     )&0xff;
 595     }
 596
 597     /* Add a new ES */
 598     if( tk->fmt.i_cat == VIDEO_ES )
 599     {
 600         if( p_sys->i_aspect >= 0 )
 601         {
 602             tk->fmt.video.i_aspect = p_sys->i_aspect;
 603         }
 604     }
 605     else if( tk->fmt.i_cat == AUDIO_ES )
 606     {
 607         int i_audio = -1;
 608         /* find the audio number PLEASE find another way */
 609         if( (i_id&0xbdf8) == 0xbd88 )       /* dts */
 610         {
 611             i_audio = i_id&0x07;
 612         }
 613         else if( (i_id&0xbdf0) == 0xbd80 )  /* a52 */
 614         {
 615             i_audio = i_id&0xf;
 616         }
 617         else if( (i_id&0xbdf0) == 0xbda0 )  /* lpcm */
 618         {
 619             i_audio = i_id&0x1f;
 620         }
 621         else if( ( i_id&0xe0 ) == 0xc0 )    /* mpga */
 622         {
 623             i_audio = i_id&0x1f;
 624         }
 625
 626         if( psz_language[0] ) tk->fmt.psz_language = strdup( psz_language );
 627     }
 628     else if( tk->fmt.i_cat == SPU_ES )
 629     {
 630         /* Palette */
 631         tk->fmt.subs.spu.palette[0] = 0xBeef;
 632         memcpy( &tk->fmt.subs.spu.palette[1], p_sys->clut,
 633                 16 * sizeof( uint32_t ) );
 634
 635         if( psz_language[0] ) tk->fmt.psz_language = strdup( psz_language );
 636     }
 637
 638     tk->es = es_out_Add( p_demux->out, &tk->fmt );
 639     tk->b_seen = VLC_TRUE;
 640 }
 641
 642 /*****************************************************************************
 643  * DvdReadSetArea: initialize input data for title x, chapter y.
 644  * It should be called for each user navigation request.
 645  *****************************************************************************
 646  * Take care that i_title and i_chapter start from 0.
 647  *****************************************************************************/
 648 static int DvdReadSetArea( demux_t *p_demux, int i_title, int i_chapter,
 649                            int i_angle )
 650 {
 651     demux_sys_t *p_sys = p_demux->p_sys;
 652     int         pgc_id = 0;
 653     int         pgn = 0;
 654     int         i;
 655     vlc_value_t val;
 656
 657 #define p_pgc p_sys->p_cur_pgc
 658 #define p_vmg p_sys->p_vmg_file
 659 #define p_vts p_sys->p_vts_file
 660
 661     if( i_title >= 0 && i_title < p_sys->i_titles &&
 662         i_title != p_sys->i_title )
 663     {
 664         int i_start_cell, i_end_cell;
 665
 666         if( p_sys->p_title != NULL ) DVDCloseFile( p_sys->p_title );
 667         if( p_vts != NULL ) ifoClose( p_vts );
 668         p_sys->i_title = i_title;
 669
 670         /*
 671          *  We have to load all title information
 672          */
 673         msg_Dbg( p_demux, "open VTS %d, for title %d",
 674                  p_vmg->tt_srpt->title[i_title].title_set_nr, i_title + 1 );
 675
 676         /* Ifo vts */
 677         if( !( p_vts = ifoOpen( p_sys->p_dvdread,
 678                p_vmg->tt_srpt->title[i_title].title_set_nr ) ) )
 679         {
 680             msg_Err( p_demux, "fatal error in vts ifo" );
 681             return VLC_EGENERIC;
 682         }
 683
 684         /* Title position inside the selected vts */
 685         p_sys->i_ttn = p_vmg->tt_srpt->title[i_title].vts_ttn;
 686
 687         /* Find title start/end */
 688         pgc_id = p_vts->vts_ptt_srpt->title[p_sys->i_ttn - 1].ptt[0].pgcn;
 689         pgn = p_vts->vts_ptt_srpt->title[p_sys->i_ttn - 1].ptt[0].pgn;
 690         p_pgc = p_vts->vts_pgcit->pgci_srp[pgc_id - 1].pgc;
 691
 692         p_sys->i_title_start_cell =
 693             i_start_cell = p_pgc->program_map[pgn - 1] - 1;
 694         p_sys->i_title_start_block =
 695             p_pgc->cell_playback[i_start_cell].first_sector;
 696
 697         i_end_cell = p_pgc->nr_of_cells - 1;
 698         p_sys->i_title_end_block =
 699             p_pgc->cell_playback[i_end_cell].last_sector;
 700
 701         p_sys->i_title_offset = 0;
 702
 703         p_sys->i_title_blocks = 0;
 704         for( i = i_start_cell; i <= i_end_cell; i++ )
 705         {
 706             p_sys->i_title_blocks += p_pgc->cell_playback[i].last_sector -
 707                 p_pgc->cell_playback[i].first_sector + 1;
 708         }
 709
 710         msg_Dbg( p_demux, "title %d vts_title %d pgc %d pgn %d "
 711                  "start %d end %d blocks: %d",
 712                  i_title + 1, p_sys->i_ttn, pgc_id, pgn,
 713                  p_sys->i_title_start_block, p_sys->i_title_end_block,
 714                  p_sys->i_title_blocks );
 715
 716         /*
 717          * Set properties for current chapter
 718          */
 719         p_sys->i_chapter = 0;
 720         p_sys->i_chapters =
 721             p_vts->vts_ptt_srpt->title[p_sys->i_ttn - 1].nr_of_ptts;
 722
 723         pgc_id = p_vts->vts_ptt_srpt->title[
 724                     p_sys->i_ttn - 1].ptt[p_sys->i_chapter].pgcn;
 725         pgn = p_vts->vts_ptt_srpt->title[
 726                     p_sys->i_ttn - 1].ptt[p_sys->i_chapter].pgn;
 727
 728         p_pgc = p_vts->vts_pgcit->pgci_srp[pgc_id - 1].pgc;
 729         p_sys->i_pack_len = 0;
 730         p_sys->i_next_cell =
 731             p_sys->i_cur_cell = p_pgc->program_map[pgn - 1] - 1;
 732         DvdReadFindCell( p_demux );
 733
 734         p_sys->i_next_vobu = p_sys->i_cur_block =
 735             p_pgc->cell_playback[p_sys->i_cur_cell].first_sector;
 736
 737         /*
 738          * Angle management
 739          */
 740         p_sys->i_angles = p_vmg->tt_srpt->title[i_title].nr_of_angles;
 741         if( p_sys->i_angle > p_sys->i_angles ) p_sys->i_angle = 1;
 742
 743         /*
 744          * We've got enough info, time to open the title set data.
 745          */
 746         if( !( p_sys->p_title = DVDOpenFile( p_sys->p_dvdread,
 747             p_vmg->tt_srpt->title[i_title].title_set_nr,
 748             DVD_READ_TITLE_VOBS ) ) )
 749         {
 750             msg_Err( p_demux, "cannot open title (VTS_%02d_1.VOB)",
 751                      p_vmg->tt_srpt->title[i_title].title_set_nr );
 752             return VLC_EGENERIC;
 753         }
 754
 755         //IfoPrintTitle( p_demux );
 756
 757         /*
 758          * Destroy obsolete ES by reinitializing program 0
 759          * and find all ES in title with ifo data
 760          */
 761         es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
 762
 763         for( i = 0; i < PS_TK_COUNT; i++ )
 764         {
 765             ps_track_t *tk = &p_sys->tk[i];
 766             if( tk->b_seen )
 767             {
 768                 es_format_Clean( &tk->fmt );
 769                 if( tk->es ) es_out_Del( p_demux->out, tk->es );
 770             }
 771             tk->b_seen = VLC_FALSE;
 772         }
 773
 774         if( p_demux->info.i_title != i_title )
 775         {
 776             p_demux->info.i_update |=
 777                 INPUT_UPDATE_TITLE | INPUT_UPDATE_SEEKPOINT;
 778             p_demux->info.i_title = i_title;
 779             p_demux->info.i_seekpoint = 0;
 780         }
 781
 782         /* TODO: re-add angles */
 783
 784
 785         ESNew( p_demux, 0xe0, 0 ); /* Video, FIXME ? */
 786
 787 #define audio_control \
 788     p_sys->p_vts_file->vts_pgcit->pgci_srp[pgc_id-1].pgc->audio_control[i-1]
 789
 790         /* Audio ES, in the order they appear in the .ifo */
 791         for( i = 1; i <= p_vts->vtsi_mat->nr_of_vts_audio_streams; i++ )
 792         {
 793             int i_position = 0;
 794             uint16_t i_id;
 795
 796             //IfoPrintAudio( p_demux, i );
 797
 798             /* Audio channel is active if first byte is 0x80 */
 799             if( audio_control & 0x8000 )
 800             {
 801                 i_position = ( audio_control & 0x7F00 ) >> 8;
 802
 803                 msg_Dbg( p_demux, "audio position  %d", i_position );
 804                 switch( p_vts->vtsi_mat->vts_audio_attr[i - 1].audio_format )
 805                 {
 806                 case 0x00: /* A52 */
 807                     i_id = (0x80 + i_position) | 0xbd00;
 808                     break;
 809                 case 0x02:
 810                 case 0x03: /* MPEG audio */
 811                     i_id = 0xc000 + i_position;
 812                     break;
 813                 case 0x04: /* LPCM */
 814                     i_id = (0xa0 + i_position) | 0xbd00;
 815                     break;
 816                 case 0x06: /* DTS */
 817                     i_id = (0x88 + i_position) | 0xbd00;
 818                     break;
 819                 default:
 820                     i_id = 0;
 821                     msg_Err( p_demux, "unknown audio type %.2x",
 822                         p_vts->vtsi_mat->vts_audio_attr[i - 1].audio_format );
 823                 }
 824
 825                 ESNew( p_demux, i_id, p_sys->p_vts_file->vtsi_mat->
 826                        vts_audio_attr[i - 1].lang_code );
 827             }
 828         }
 829 #undef audio_control
 830
 831 #define spu_control \
 832     p_sys->p_vts_file->vts_pgcit->pgci_srp[pgc_id-1].pgc->subp_control[i-1]
 833
 834         /* Sub Picture ES */
 835         for( i = 1; i <= p_vts->vtsi_mat->nr_of_vts_subp_streams; i++ )
 836         {
 837             int i_position = 0;
 838             uint16_t i_id;
 839
 840             //IfoPrintSpu( p_sys, i );
 841             msg_Dbg( p_demux, "spu %d 0x%02x", i, spu_control );
 842
 843             if( spu_control & 0x80000000 )
 844             {
 845                 /*  there are several streams for one spu */
 846                 if( p_vts->vtsi_mat->vts_video_attr.display_aspect_ratio )
 847                 {
 848                     /* 16:9 */
 849                     switch( p_vts->vtsi_mat->vts_video_attr.permitted_df )
 850                     {
 851                     case 1:
 852                         i_position = spu_control & 0xff;
 853                         break;
 854                     case 2:
 855                         i_position = ( spu_control >> 8 ) & 0xff;
 856                         break;
 857                     default:
 858                         i_position = ( spu_control >> 16 ) & 0xff;
 859                         break;
 860                     }
 861                 }
 862                 else
 863                 {
 864                     /* 4:3 */
 865                     i_position = ( spu_control >> 24 ) & 0x7F;
 866                 }
 867
 868                 i_id = (0x20 + i_position) | 0xbd00;
 869
 870                 ESNew( p_demux, i_id, p_sys->p_vts_file->vtsi_mat->
 871                        vts_subp_attr[i - 1].lang_code );
 872             }
 873         }
 874 #undef spu_control
 875
 876     }
 877     else
 878     {
 879         /* TODO: update input ? */
 880     }
 881
 882     /*
 883      * Chapter selection
 884      */
 885
 886     if( i_chapter >= 0 && i_chapter <= p_sys->i_chapters &&
 887         i_chapter != p_sys->i_chapter )
 888     {
 889         pgc_id = p_vts->vts_ptt_srpt->title[
 890                      p_sys->i_ttn - 1].ptt[i_chapter].pgcn;
 891         pgn = p_vts->vts_ptt_srpt->title[
 892                   p_sys->i_ttn - 1].ptt[i_chapter].pgn;
 893
 894         p_pgc = p_vts->vts_pgcit->pgci_srp[pgc_id - 1].pgc;
 895
 896         p_sys->i_cur_cell = p_pgc->program_map[pgn - 1] - 1;
 897         p_sys->i_chapter = i_chapter;
 898         DvdReadFindCell( p_demux );
 899
 900         p_sys->i_title_offset = 0;
 901         for( i = p_sys->i_title_start_cell; i < p_sys->i_cur_cell; i++ )
 902         {
 903             p_sys->i_title_offset += p_pgc->cell_playback[i].last_sector -
 904                 p_pgc->cell_playback[i].first_sector + 1;
 905         }
 906
 907         p_sys->i_pack_len = 0;
 908         p_sys->i_next_vobu = p_sys->i_cur_block =
 909             p_pgc->cell_playback[p_sys->i_cur_cell].first_sector;
 910
 911         if( p_demux->info.i_seekpoint != i_chapter )
 912         {
 913             p_demux->info.i_update |= INPUT_UPDATE_SEEKPOINT;
 914             p_demux->info.i_seekpoint = i_chapter;
 915         }
 916     }
 917
 918 #undef p_pgc
 919 #undef p_vts
 920 #undef p_vmg
 921
 922     return VLC_SUCCESS;
 923 }
 924
 925 /*****************************************************************************
 926  * DvdReadSeek : Goes to a given position on the stream.
 927  *****************************************************************************
 928  * This one is used by the input and translate chronological position from
 929  * input to logical position on the device.
 930  *****************************************************************************/
 931 static void DvdReadSeek( demux_t *p_demux, int i_block_offset )
 932 {
 933     demux_sys_t *p_sys = p_demux->p_sys;
 934     unsigned int i_tmp;
 935     unsigned int i_chapter = 0;
 936     unsigned int i_cell = 0;
 937     unsigned int i_vobu = 0;
 938     unsigned int i_sub_cell = 0;
 939     int i_block;
 940
 941 #define p_pgc p_sys->p_cur_pgc
 942 #define p_vts p_sys->p_vts_file
 943
 944     /* Find cell */
 945     p_sys->i_title_offset = i_block = i_block_offset;
 946     while( i_block >= (int)p_pgc->cell_playback[i_cell].last_sector -
 947            (int)p_pgc->cell_playback[i_cell].first_sector + 1 )
 948     {
 949         i_cell++;
 950
 951         i_block -= p_pgc->cell_playback[i_cell].last_sector -
 952             p_pgc->cell_playback[i_cell].first_sector + 1;
 953     }
 954
 955     i_block += p_pgc->cell_playback[i_cell].first_sector;
 956
 957     /* Find chapter */
 958     do
 959     {
 960         int pgc_id, pgn;
 961
 962         i_chapter++;
 963         pgc_id = p_vts->vts_ptt_srpt->title[
 964                     p_sys->i_ttn - 1].ptt[i_chapter].pgcn;
 965         pgn = p_vts->vts_ptt_srpt->title[
 966                     p_sys->i_ttn - 1].ptt[i_chapter].pgn;
 967
 968         i_tmp = p_vts->vts_pgcit->pgci_srp[pgc_id - 1].pgc->program_map[pgn-1];
 969
 970     } while( i_tmp <= i_cell );
 971
 972     /* Find vobu */
 973     while( p_vts->vts_vobu_admap->vobu_start_sectors[i_vobu] <= i_block )
 974     {
 975         i_vobu++;
 976     }
 977
 978     /* Find sub_cell */
 979     while( p_vts->vts_c_adt->cell_adr_table[i_sub_cell].start_sector <
 980            p_vts->vts_vobu_admap->vobu_start_sectors[i_vobu-1] )
 981     {
 982         i_sub_cell++;
 983     }
 984
 985 #if 1
 986     msg_Dbg( p_demux, "cell %d i_sub_cell %d chapter %d vobu %d "
 987              "cell_sector %d vobu_sector %d sub_cell_sector %d",
 988              i_cell, i_sub_cell,i_chapter, i_vobu,
 989              p_sys->p_cur_pgc->cell_playback[i_cell].first_sector,
 990              p_vts->vts_vobu_admap->vobu_start_sectors[i_vobu],
 991              p_vts->vts_c_adt->cell_adr_table[i_sub_cell - 1].start_sector);
 992 #endif
 993
 994     p_sys->i_cur_block = i_block;
 995     p_sys->i_next_vobu = p_vts->vts_vobu_admap->vobu_start_sectors[i_vobu];
 996     p_sys->i_pack_len = p_sys->i_next_vobu - i_block;
 997     p_sys->i_cur_cell = i_cell;
 998     p_sys->i_chapter = i_chapter;
 999     DvdReadFindCell( p_demux );
1000
1001 #undef p_vts
1002 #undef p_pgc
1003
1004     return;
1005 }
1006
1007 /*****************************************************************************
1008  * DvdReadHandleDSI
1009  *****************************************************************************/
1010 static void DvdReadHandleDSI( demux_t *p_demux, uint8_t *p_data )
1011 {
1012     demux_sys_t *p_sys = p_demux->p_sys;
1013
1014     navRead_DSI( &p_sys->dsi_pack, &p_data[DSI_START_BYTE] );
1015
1016     /*
1017      * Determine where we go next.  These values are the ones we mostly
1018      * care about.
1019      */
1020     p_sys->i_cur_block = p_sys->dsi_pack.dsi_gi.nv_pck_lbn;
1021
1022     /*
1023      * If we're not at the end of this cell, we can determine the next
1024      * VOBU to display using the VOBU_SRI information section of the
1025      * DSI.  Using this value correctly follows the current angle,
1026      * avoiding the doubled scenes in The Matrix, and makes our life
1027      * really happy.
1028      */
1029     if( p_sys->dsi_pack.vobu_sri.next_vobu != SRI_END_OF_CELL )
1030     {
1031         switch( ( p_sys->dsi_pack.sml_pbi.category & 0xf000 ) >> 12 )
1032         {
1033         case 0x4:
1034             /* Interleaved unit with no angle */
1035             if( p_sys->dsi_pack.sml_pbi.ilvu_sa != 0 )
1036             {
1037                 p_sys->i_next_vobu = p_sys->i_cur_block +
1038                     p_sys->dsi_pack.sml_pbi.ilvu_sa;
1039                 p_sys->i_pack_len = p_sys->dsi_pack.sml_pbi.ilvu_ea;
1040             }
1041             else
1042             {
1043                 p_sys->i_next_vobu = p_sys->i_cur_block +
1044                     p_sys->dsi_pack.dsi_gi.vobu_ea + 1;
1045                 p_sys->i_pack_len = p_sys->dsi_pack.dsi_gi.vobu_ea;
1046             }
1047             break;
1048         case 0x5:
1049             /* vobu is end of ilvu */
1050             if( p_sys->dsi_pack.sml_agli.data[p_sys->i_angle-1].address )
1051             {
1052                 p_sys->i_next_vobu = p_sys->i_cur_block +
1053                     p_sys->dsi_pack.sml_agli.data[p_sys->i_angle-1].address;
1054                 p_sys->i_pack_len = p_sys->dsi_pack.sml_pbi.ilvu_ea;
1055
1056                 break;
1057             }
1058         case 0x6:
1059             /* vobu is beginning of ilvu */
1060         case 0x9:
1061             /* next scr is 0 */
1062         case 0xa:
1063             /* entering interleaved section */
1064         case 0x8:
1065             /* non interleaved cells in interleaved section */
1066         default:
1067             p_sys->i_next_vobu = p_sys->i_cur_block +
1068                 ( p_sys->dsi_pack.vobu_sri.next_vobu & 0x7fffffff );
1069             p_sys->i_pack_len = p_sys->dsi_pack.dsi_gi.vobu_ea;
1070             break;
1071         }
1072     }
1073     else
1074     {
1075         p_sys->i_cur_cell = p_sys->i_next_cell;
1076         DvdReadFindCell( p_demux );
1077
1078         p_sys->i_pack_len = p_sys->dsi_pack.dsi_gi.vobu_ea;
1079         p_sys->i_next_vobu =
1080             p_sys->p_cur_pgc->cell_playback[p_sys->i_cur_cell].first_sector;
1081     }
1082
1083 #if 0
1084     msg_Dbg( p_input, 12, "scr %d lbn 0x%02x vobu_ea %d vob_id %d c_id %d",
1085              p_sys->dsi_pack.dsi_gi.nv_pck_scr,
1086              p_sys->dsi_pack.dsi_gi.nv_pck_lbn,
1087              p_sys->dsi_pack.dsi_gi.vobu_ea,
1088              p_sys->dsi_pack.dsi_gi.vobu_vob_idn,
1089              p_sys->dsi_pack.dsi_gi.vobu_c_idn );
1090
1091     msg_Dbg( p_input, 12, "cat 0x%02x ilvu_ea %d ilvu_sa %d size %d",
1092              p_sys->dsi_pack.sml_pbi.category,
1093              p_sys->dsi_pack.sml_pbi.ilvu_ea,
1094              p_sys->dsi_pack.sml_pbi.ilvu_sa,
1095              p_sys->dsi_pack.sml_pbi.size );
1096
1097     msg_Dbg( p_input, 12, "next_vobu %d next_ilvu1 %d next_ilvu2 %d",
1098              p_sys->dsi_pack.vobu_sri.next_vobu & 0x7fffffff,
1099              p_sys->dsi_pack.sml_agli.data[ p_sys->i_angle - 1 ].address,
1100              p_sys->dsi_pack.sml_agli.data[ p_sys->i_angle ].address);
1101 #endif
1102 }
1103
1104 /*****************************************************************************
1105  * DvdReadFindCell
1106  *****************************************************************************/
1107 static void DvdReadFindCell( demux_t *p_demux )
1108 {
1109     demux_sys_t *p_sys = p_demux->p_sys;
1110
1111     pgc_t *p_pgc;
1112     int   pgc_id, pgn;
1113     int   i = 0;
1114
1115 #define cell p_sys->p_cur_pgc->cell_playback
1116
1117     if( cell[p_sys->i_cur_cell].block_type == BLOCK_TYPE_ANGLE_BLOCK )
1118     {
1119 #if 0
1120         p_sys->i_next_cell = p_sys->i_cur_cell + p_sys->i_angle_nb;
1121         p_sys->i_cur_cell += p_sys->i_angle - 1;
1122 #else
1123         p_sys->i_cur_cell += p_sys->i_angle - 1;
1124
1125         while( cell[p_sys->i_cur_cell+i].block_mode != BLOCK_MODE_LAST_CELL )
1126         {
1127             i++;
1128         }
1129         p_sys->i_next_cell = p_sys->i_cur_cell + i + 1;
1130 #endif
1131     }
1132     else
1133     {
1134         p_sys->i_next_cell = p_sys->i_cur_cell + 1;
1135     }
1136
1137 #undef cell
1138
1139     pgc_id = p_sys->p_vts_file->vts_ptt_srpt->title[
1140                 p_sys->i_ttn - 1].ptt[p_sys->i_chapter].pgcn;
1141     pgn = p_sys->p_vts_file->vts_ptt_srpt->title[
1142               p_sys->i_ttn - 1].ptt[p_sys->i_chapter].pgn;
1143     p_pgc = p_sys->p_vts_file->vts_pgcit->pgci_srp[pgc_id - 1].pgc;
1144
1145     if( p_pgc->program_map[pgn - 1] <= p_sys->i_cur_cell )
1146     {
1147         p_sys->i_chapter++;
1148
1149         if( p_sys->i_chapter < p_sys->i_chapters &&
1150             p_demux->info.i_seekpoint != p_sys->i_chapter )
1151         {
1152             p_demux->info.i_update |= INPUT_UPDATE_SEEKPOINT;
1153             p_demux->info.i_seekpoint = p_sys->i_chapter;
1154         }
1155     }
1156 }
1157
1158 /*****************************************************************************
1159  * DemuxTitles: get the titles/chapters structure
1160  *****************************************************************************/
1161 static void DemuxTitles( demux_t *p_demux,
1162                          int *pi_title, int *pi_chapter, int *pi_angle )
1163 {
1164     demux_sys_t *p_sys = p_demux->p_sys;
1165     input_title_t *t;
1166     seekpoint_t *s;
1167     int32_t i_titles;
1168     int i;
1169
1170     /* Find out number of titles/chapters */
1171 #define tt_srpt p_sys->p_vmg_file->tt_srpt
1172
1173     i_titles = tt_srpt->nr_of_srpts;
1174     msg_Dbg( p_demux, "number of titles: %d", i_titles );
1175
1176     for( i = 0; i < i_titles; i++ )
1177     {
1178         int32_t i_chapters = 0;
1179         int j;
1180
1181         i_chapters = tt_srpt->title[i].nr_of_ptts;
1182         msg_Dbg( p_demux, "title %d has %d chapters", i, i_chapters );
1183
1184         t = vlc_input_title_New();
1185         for( j = 0; j < __MAX( i_chapters, 1 ); j++ )
1186         {
1187             s = vlc_seekpoint_New();
1188             TAB_APPEND( t->i_seekpoint, t->seekpoint, s );
1189         }
1190
1191         TAB_APPEND( p_sys->i_titles, p_sys->titles, t );
1192     }
1193
1194     /* Set forced title/chapter/angle */
1195     *pi_title = (*pi_title >= 1 && *pi_title <= i_titles) ? *pi_title : 1;
1196     *pi_chapter = (*pi_chapter >= 0 && *pi_chapter <
1197         tt_srpt->title[*pi_title].nr_of_ptts) ? *pi_chapter : 0;
1198
1199 #undef tt_srpt
1200 }
1201
1202 /*****************************************************************************
1203  * ParseCL: parse command line
1204  *****************************************************************************/
1205 static char *ParseCL( vlc_object_t *p_this, char *psz_name, vlc_bool_t b_force,
1206                       int *i_title, int *i_chapter, int *i_angle )
1207 {
1208     char *psz_parser, *psz_source, *psz_next;
1209
1210     psz_source = strdup( psz_name );
1211     if( psz_source == NULL ) return NULL;
1212
1213     *i_title = 0;
1214     *i_chapter = 0;
1215     *i_angle = 1;
1216
1217     /* Start with the end, because you could have :
1218      * dvdnav:/Volumes/my@toto/VIDEO_TS@1,1
1219      * (yes, this is kludgy). */
1220     for( psz_parser = psz_source + strlen(psz_source) - 1;
1221          psz_parser >= psz_source && *psz_parser != '@';
1222          psz_parser-- );
1223
1224     if( psz_parser >= psz_source && *psz_parser == '@' )
1225     {
1226         /* Found options */
1227         *psz_parser = '\0';
1228         ++psz_parser;
1229
1230         *i_title = (int)strtol( psz_parser, &psz_next, 10 );
1231         if( *psz_next )
1232         {
1233             psz_parser = psz_next + 1;
1234             *i_chapter = (int)strtol( psz_parser, &psz_next, 10 );
1235             if( *psz_next )
1236             {
1237                 *i_angle = (int)strtol( psz_next + 1, NULL, 10 );
1238             }
1239         }
1240     }
1241
1242     *i_title   = *i_title >= 0 ? *i_title : 0;
1243     *i_chapter = *i_chapter    ? *i_chapter : 0;
1244     *i_angle   = *i_angle      ? *i_angle : 1;
1245
1246     if( !*psz_source )
1247     {
1248         free( psz_source );
1249         if( !b_force )
1250         {
1251             return NULL;
1252         }
1253         psz_source = config_GetPsz( p_this, "dvd" );
1254         if( !psz_source ) return NULL;
1255     }
1256
1257 #ifdef WIN32
1258     if( psz_source[0] && psz_source[1] == ':' &&
1259         psz_source[2] == '\\' && psz_source[3] == '\0' )
1260     {
1261         psz_source[2] = '\0';
1262     }
1263 #endif
1264
1265     msg_Dbg( p_this, "dvdroot=%s title=%d chapter=%d angle=%d",
1266              psz_source, *i_title, *i_chapter, *i_angle );
1267
1268     return psz_source;
1269 }