git.sesse.net Git - vlc/blob - plugins/vcd/input_vcd.c

   1 /****************************************************************************
   2  * input_vcd.c: VideoCD raw reading plugin.
   3  *****************************************************************************
   4  * Copyright (C) 1998-2001 VideoLAN
   5  *
   6  * Author: Johan Bilien <jobi@via.ecp.fr>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  21  *****************************************************************************/
  22
  23 /*****************************************************************************
  24  * Preamble
  25  *****************************************************************************/
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28
  29 #include <videolan/vlc.h>
  30
  31 #ifdef HAVE_UNISTD_H
  32 #   include <unistd.h>
  33 #endif
  34
  35 #include <fcntl.h>
  36 #include <sys/types.h>
  37 #include <string.h>
  38 #include <errno.h>
  39
  40 #ifdef STRNCASECMP_IN_STRINGS_H
  41 #   include <strings.h>
  42 #endif
  43
  44 #if defined( WIN32 )
  45 #   include <io.h>                                                 /* read() */
  46 #else
  47 #   include <sys/uio.h>                                      /* struct iovec */
  48 #endif
  49
  50 #if defined( WIN32 )
  51 #   include "input_iovec.h"
  52 #endif
  53
  54 #include "stream_control.h"
  55 #include "input_ext-intf.h"
  56 #include "input_ext-dec.h"
  57 #include "input_ext-plugins.h"
  58
  59 #include "debug.h"
  60
  61 #include "input_vcd.h"
  62 #include "linux_cdrom_tools.h"
  63
  64 /* how many blocks VCDRead will read in each loop */
  65 #define VCD_BLOCKS_ONCE 4
  66 #define VCD_DATA_ONCE   (2 * VCD_BLOCKS_ONCE)
  67 #define BUFFER_SIZE VCD_DATA_SIZE
  68
  69 /*****************************************************************************
  70  * Local prototypes
  71  *****************************************************************************/
  72 /* called from outside */
  73 static int  VCDProbe        ( probedata_t *p_data );
  74 static void VCDInit         ( struct input_thread_s * );
  75 static int  VCDRead         ( struct input_thread_s *, data_packet_t ** );
  76 static int  VCDSetArea      ( struct input_thread_s *, struct input_area_s * );
  77 static int  VCDSetProgram   ( struct input_thread_s *, pgrm_descriptor_t * );
  78 static void VCDOpen         ( struct input_thread_s *);
  79 static void VCDClose        ( struct input_thread_s *);
  80 static void VCDEnd          ( struct input_thread_s *);
  81 static void VCDSeek         ( struct input_thread_s *, off_t );
  82 static int  VCDRewind       ( struct input_thread_s * );
  83
  84 /*****************************************************************************
  85  * Declare a buffer manager
  86  *****************************************************************************/
  87 #define FLAGS           BUFFERS_NOFLAGS
  88 #define NB_LIFO         2
  89 DECLARE_BUFFERS_EMBEDDED( FLAGS, NB_LIFO );
  90 DECLARE_BUFFERS_INIT( FLAGS, NB_LIFO );
  91 DECLARE_BUFFERS_END( FLAGS, NB_LIFO );
  92 DECLARE_BUFFERS_NEWPACKET( FLAGS, NB_LIFO );
  93 DECLARE_BUFFERS_DELETEPACKET( FLAGS, NB_LIFO, 1000 );
  94 DECLARE_BUFFERS_NEWPES( FLAGS, NB_LIFO );
  95 DECLARE_BUFFERS_DELETEPES( FLAGS, NB_LIFO, 1000 );
  96
  97
  98 /*****************************************************************************
  99  * Functions exported as capabilities. They are declared as static so that
 100  * we don't pollute the namespace too much.
 101  *****************************************************************************/
 102 void _M( input_getfunctions )( function_list_t * p_function_list )
 103 {
 104 #define input p_function_list->functions.input
 105     p_function_list->pf_probe = VCDProbe;
 106     input.pf_init             = VCDInit;
 107     input.pf_open             = VCDOpen;
 108     input.pf_close            = VCDClose;
 109     input.pf_end              = VCDEnd;
 110     input.pf_init_bit_stream  = InitBitstream;
 111     input.pf_read             = VCDRead;
 112     input.pf_set_area         = VCDSetArea;
 113     input.pf_set_program      = VCDSetProgram;
 114     input.pf_demux            = input_DemuxPS;
 115     input.pf_new_packet       = input_NewPacket;
 116     input.pf_new_pes          = input_NewPES;
 117     input.pf_delete_packet    = input_DeletePacket;
 118     input.pf_delete_pes       = input_DeletePES;
 119     input.pf_rewind           = VCDRewind;
 120     input.pf_seek             = VCDSeek;
 121 #undef input
 122 }
 123
 124 /*
 125  * Data reading functions
 126  */
 127
 128 /*****************************************************************************
 129  * VCDProbe: verifies that the stream is a PS stream
 130  *****************************************************************************/
 131 static int VCDProbe( probedata_t *p_data )
 132 {
 133     input_thread_t * p_input = (input_thread_t *)p_data;
 134
 135     char * psz_name = p_input->p_source;
 136     int i_score = 0;
 137
 138     if( ( strlen(psz_name) > 4 ) && !strncasecmp( psz_name, "vcd:", 4 ) )
 139     {
 140         /* If the user specified "vcd:" then it's probably a VCD */
 141         i_score = 100;
 142         psz_name += 4;
 143     }
 144
 145     return( i_score );
 146 }
 147
 148 /*****************************************************************************
 149  * VCDOpen: open vcd
 150  *****************************************************************************/
 151 static void VCDOpen( struct input_thread_s *p_input )
 152 {
 153     vlc_mutex_lock( &p_input->stream.stream_lock );
 154
 155     /* If we are here we can control the pace... */
 156     p_input->stream.b_pace_control = 1;
 157
 158     p_input->stream.b_seekable = 1;
 159     p_input->stream.p_selected_area->i_size = 0;
 160     p_input->stream.p_selected_area->i_tell = 0;
 161
 162     vlc_mutex_unlock( &p_input->stream.stream_lock );
 163
 164     /* XXX: put this shit in an access plugin */
 165     if( strlen( p_input->p_source ) > 4
 166          && !strncasecmp( p_input->p_source, "vcd:", 4 ) )
 167     {
 168         p_input->i_handle
 169             = open( p_input->p_source + 4, O_RDONLY | O_NONBLOCK );
 170     }
 171     else
 172     {
 173         p_input->i_handle
 174             = open( p_input->p_source, O_RDONLY | O_NONBLOCK );
 175     }
 176
 177     if( p_input->i_handle == -1 )
 178     {
 179         p_input->b_error = 1;
 180     }
 181 }
 182
 183 /*****************************************************************************
 184  * VCDClose: close vcd
 185  *****************************************************************************/
 186 static void VCDClose( struct input_thread_s *p_input )
 187 {
 188     close( p_input->i_handle );
 189 }
 190
 191 /*****************************************************************************
 192  * VCDInit: initializes VCD structures
 193  *****************************************************************************/
 194 static void VCDInit( input_thread_t * p_input )
 195 {
 196     thread_vcd_data_t *  p_vcd;
 197     int                  i_title;
 198     int                  i_chapter;
 199     int                  i;
 200     input_area_t *       p_area;
 201     es_descriptor_t *    p_es;
 202
 203     p_vcd = malloc( sizeof(thread_vcd_data_t) );
 204
 205     if( p_vcd == NULL )
 206     {
 207         intf_ErrMsg( "vcd error: out of memory" );
 208         p_input->b_error = 1;
 209         return;
 210     }
 211
 212     p_input->p_plugin_data = (void *)p_vcd;
 213
 214     if( (p_input->p_method_data = input_BuffersInit()) == NULL )
 215     {
 216         free( p_vcd );
 217         p_input->b_error = 1;
 218         return;
 219     }
 220
 221     p_vcd->i_handle = p_input->i_handle;
 222
 223     /* We read the Table Of Content information */
 224     p_vcd->nb_tracks = ioctl_GetTrackCount( p_input->i_handle );
 225     if( p_vcd->nb_tracks < 0 )
 226     {
 227         input_BuffersEnd( p_input->p_method_data );
 228         free( p_vcd );
 229         p_input->b_error = 1;
 230         return;
 231     }
 232     else if( p_vcd->nb_tracks <= 1 )
 233     {
 234         intf_ErrMsg( "input error: no movie tracks found" );
 235         input_BuffersEnd( p_input->p_method_data );
 236         free( p_vcd );
 237         p_input->b_error = 1;
 238         return;
 239     }
 240
 241     p_vcd->p_sectors = ioctl_GetSectors( p_input->i_handle );
 242     if ( p_vcd->p_sectors == NULL )
 243     {
 244         input_BuffersEnd( p_input->p_method_data );
 245         free( p_vcd );
 246         p_input->b_error = 1;
 247         return;
 248     }
 249
 250     /* Set stream and area data */
 251     vlc_mutex_lock( &p_input->stream.stream_lock );
 252
 253     /* Initialize ES structures */
 254     input_InitStream( p_input, sizeof( stream_ps_data_t ) );
 255
 256     /* disc input method */
 257     p_input->stream.i_method = INPUT_METHOD_VCD;
 258
 259 #define area p_input->stream.pp_areas
 260     for( i = 1 ; i <= p_vcd->nb_tracks - 1 ; i++ )
 261     {
 262         input_AddArea( p_input );
 263
 264         /* Titles are Program Chains */
 265         area[i]->i_id = i;
 266
 267         /* Absolute start offset and size */
 268         area[i]->i_start = (off_t)p_vcd->p_sectors[i] * (off_t)VCD_DATA_SIZE;
 269         area[i]->i_size = (off_t)(p_vcd->p_sectors[i+1] - p_vcd->p_sectors[i])
 270                            * (off_t)VCD_DATA_SIZE;
 271
 272         /* Number of chapters */
 273         area[i]->i_part_nb = 0;   // will be the entry points
 274         area[i]->i_part = 1;
 275
 276         /* Number of angles */
 277         area[i]->i_angle_nb = 1; // no angle support in VCDs
 278         area[i]->i_angle = 1;
 279
 280         area[i]->i_plugin_data = p_vcd->p_sectors[i];
 281     }
 282 #undef area
 283
 284     /* Get requested title - if none try the first title */
 285     i_title = main_GetIntVariable( INPUT_TITLE_VAR, 1 );
 286     if( i_title <= 0 )
 287     {
 288         i_title = 1;
 289     }
 290
 291     // p_vcd->i_track = i_title-1;
 292
 293     /* Get requested chapter - if none defaults to first one */
 294     i_chapter = main_GetIntVariable( INPUT_CHAPTER_VAR, 1 );
 295     if( i_chapter <= 0 )
 296     {
 297         i_chapter = 1;
 298     }
 299
 300     p_input->stream.pp_areas[i_title]->i_part = i_chapter;
 301
 302     p_area = p_input->stream.pp_areas[i_title];
 303
 304     VCDSetArea( p_input, p_area );
 305
 306     /* Set program information. */
 307
 308     input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
 309     p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
 310
 311     /* No PSM to read in disc mode, we already have all the information */
 312     p_input->stream.p_selected_program->b_is_ok = 1;
 313
 314     p_es = input_AddES( p_input, p_input->stream.p_selected_program, 0xe0, 0 );
 315     p_es->i_stream_id = 0xe0;
 316     p_es->i_type = MPEG1_VIDEO_ES;
 317     p_es->i_cat = VIDEO_ES;
 318
 319     if( p_main->b_video )
 320     {
 321         input_SelectES( p_input, p_es );
 322     }
 323
 324     p_es = input_AddES( p_input, p_input->stream.p_selected_program, 0xc0, 0 );
 325     p_es->i_stream_id = 0xc0;
 326     p_es->i_type = MPEG1_AUDIO_ES;
 327     p_es->b_audio = 1;
 328     p_es->i_cat = AUDIO_ES;
 329
 330     if( p_main->b_audio )
 331     {
 332         input_SelectES( p_input, p_es );
 333     }
 334
 335     vlc_mutex_unlock( &p_input->stream.stream_lock );
 336 }
 337
 338 /*****************************************************************************
 339  * VCDEnd: frees unused data
 340  *****************************************************************************/
 341 static void VCDEnd( input_thread_t * p_input )
 342 {
 343     thread_vcd_data_t *     p_vcd;
 344
 345     input_BuffersEnd( p_input->p_method_data );
 346
 347     p_vcd = (thread_vcd_data_t*)p_input->p_plugin_data;
 348
 349     free( p_vcd );
 350 }
 351
 352 /*****************************************************************************
 353  * VCDSetProgram: Does nothing since a VCD is mono_program
 354  *****************************************************************************/
 355 static int VCDSetProgram( input_thread_t * p_input,
 356                           pgrm_descriptor_t * p_program)
 357 {
 358     return 0;
 359 }
 360
 361
 362 /*****************************************************************************
 363  * VCDSetArea: initialize input data for title x, chapter y.
 364  * It should be called for each user navigation request.
 365  ****************************************************************************/
 366 static int VCDSetArea( input_thread_t * p_input, input_area_t * p_area )
 367 {
 368     thread_vcd_data_t *     p_vcd;
 369
 370     p_vcd = (thread_vcd_data_t*)p_input->p_plugin_data;
 371
 372     /* we can't use the interface slider until initilization is complete */
 373     p_input->stream.b_seekable = 0;
 374
 375     if( p_area != p_input->stream.p_selected_area )
 376     {
 377         /* Reset the Chapter position of the current title */
 378         p_input->stream.p_selected_area->i_part = 1;
 379         p_input->stream.p_selected_area->i_tell = 0;
 380
 381         /* Change the default area */
 382         p_input->stream.p_selected_area = p_area;
 383
 384         /* Change the current track */
 385         /* The first track is not a valid one  */
 386         p_vcd->i_track = p_area->i_id;
 387         p_vcd->i_sector = p_vcd->p_sectors[p_vcd->i_track];
 388     }
 389
 390     /* warn interface that something has changed */
 391     p_input->stream.b_seekable = 1;
 392     p_input->stream.b_changed = 1;
 393
 394     return 0;
 395 }
 396
 397 /*****************************************************************************
 398  * VCDRead: reads from the VCD into PES packets.
 399  *****************************************************************************
 400  * Returns -1 in case of error, 0 in case of EOF, otherwise the number of
 401  * packets.
 402  *****************************************************************************/
 403 static int VCDRead( input_thread_t * p_input, data_packet_t ** pp_data )
 404 {
 405     thread_vcd_data_t *     p_vcd;
 406     data_packet_t *         p_data;
 407     int                     i_packet_size;
 408     int                     i_index;
 409     int                     i_packet;
 410     u32                     i_header;
 411     byte_t                  p_buffer[ VCD_DATA_SIZE ];
 412     boolean_t               b_eot = 0; /* end of track */
 413     /* boolean_t               b_eoc; No chapters yet */
 414
 415     p_vcd = (thread_vcd_data_t *)p_input->p_plugin_data;
 416
 417     i_packet = 0;
 418     *pp_data = NULL;
 419
 420     while( i_packet < VCD_DATA_ONCE )
 421     {
 422         if( ioctl_ReadSector( p_vcd->i_handle, p_vcd->i_sector, p_buffer ) )
 423         {
 424             /* Read error, but assume we reached the end of the track */
 425             b_eot = 1;
 426             break;
 427         }
 428
 429         p_vcd->i_sector++;
 430
 431         if( p_vcd->i_sector >= p_vcd->p_sectors[p_vcd->i_track + 1] )
 432         {
 433             b_eot = 1;
 434             break;
 435         }
 436
 437         i_index = 0;
 438
 439         while( i_index < BUFFER_SIZE-6 && i_packet < VCD_DATA_ONCE )
 440         {
 441             i_header = U32_AT(p_buffer + i_index);
 442
 443             /* It is common for MPEG-1 streams to pad with zeros
 444              * (although it is forbidden by the recommendation), so
 445              * don't bother everybody in this case. */
 446             while( !i_header && (++i_index < BUFFER_SIZE - 4) )
 447             {
 448                 i_header = U32_AT(p_buffer + i_index);
 449             }
 450
 451             if( !i_header )
 452             {
 453                 intf_WarnMsg( 12, "vcd warning: zero-padded packet" );
 454                 break;
 455             }
 456
 457             /* Read the stream until we find a startcode. */
 458             while( (i_header & 0xFFFFFF00) != 0x100L
 459                      && (++i_index < BUFFER_SIZE - 4) )
 460             {
 461                 i_header = U32_AT(p_buffer + i_index);
 462             }
 463
 464             if( (i_header & 0xFFFFFF00) != 0x100L )
 465             {
 466                 intf_WarnMsg( 3, "vcd warning: no packet at sector %d",
 467                                  p_vcd->i_sector - 1 );
 468                 break; /* go to the next sector */
 469             }
 470
 471             intf_DbgMsg( "packet start code : %X", i_header );
 472
 473             switch( i_header )
 474             {
 475                 /* 0x1b9 == SYSTEM_END_CODE, it is only 4 bytes long. */
 476                 case 0x1b9:
 477                     i_packet_size = -2;
 478                     break;
 479
 480                 /* Pack header */
 481                 case 0x1ba:
 482                     if( ( *( p_buffer + ( i_index + 4 ) ) & 0xC0) == 0x40 )
 483                     {
 484                         /* MPEG-2 */
 485                         i_packet_size = 8;
 486                     }
 487                     else if( (*(p_buffer + ( i_index + 4 ) ) & 0xF0) == 0x20 )
 488                     {
 489                         /* MPEG-1 */
 490                         i_packet_size = 6;
 491                     }
 492                     else
 493                     {
 494                         intf_ErrMsg( "vcd error: unable to determine "
 495                                      "stream type" );
 496                         return( -1 );
 497                     }
 498                     break;
 499
 500                 /* The packet is at least 6 bytes long. */
 501                 default:
 502                     /* That's the case for all packets, except pack header. */
 503                     i_packet_size = U16_AT((p_buffer + ( i_index + 4 )));
 504                     break;
 505             }
 506
 507             intf_DbgMsg( "i_index : %d", i_index );
 508             intf_DbgMsg( "i_packet_size : %d", i_packet_size );
 509
 510             if ( i_index + i_packet_size > BUFFER_SIZE )
 511             {
 512                 intf_ErrMsg( "vcd error: packet too long (%i)",
 513                              i_index + i_packet_size );
 514                 continue;
 515             }
 516
 517             /* Fetch a packet of the appropriate size. */
 518             p_data = p_input->pf_new_packet( p_input->p_method_data,
 519                                              i_packet_size + 6 );
 520
 521             if( p_data == NULL )
 522             {
 523                 intf_ErrMsg( "vcd error: out of memory" );
 524                 return( -1 );
 525             }
 526
 527             if( U32_AT(p_buffer) != 0x1B9 )
 528             {
 529                 FAST_MEMCPY( p_data->p_demux_start, p_buffer + i_index,
 530                              6 + i_packet_size );
 531                 i_index += ( 6 + i_packet_size );
 532             }
 533             else
 534             {
 535                 /* Copy the small header. */
 536                 memcpy( p_data->p_demux_start, p_buffer + i_index, 4 );
 537                 i_index += 4;
 538             }
 539
 540             /* Give the packet to the other input stages. */
 541             *pp_data = p_data;
 542             pp_data = &p_data->p_next;
 543
 544             i_packet++;
 545         }
 546     }
 547
 548     vlc_mutex_lock( &p_input->stream.stream_lock );
 549
 550     p_input->stream.p_selected_area->i_tell =
 551         (off_t)p_vcd->i_sector * (off_t)VCD_DATA_SIZE
 552           - p_input->stream.p_selected_area->i_start;
 553
 554     /* no chapter for the moment*/
 555 #if 0
 556     if( b_eoc )
 557     {
 558         /* We modify i_part only at end of chapter not to erase
 559          * some modification from the interface */
 560         p_input->stream.p_selected_area->i_part = p_vcd->i_chapter;
 561     }
 562 #endif
 563
 564     if( b_eot )
 565     {
 566         input_area_t *p_area;
 567
 568         /* EOF ? */
 569         if( p_vcd->i_track >= p_vcd->nb_tracks - 1 )
 570         {
 571             vlc_mutex_unlock( &p_input->stream.stream_lock );
 572             return 0;
 573         }
 574
 575         intf_WarnMsg( 4, "vcd info: new title" );
 576
 577         p_area = p_input->stream.pp_areas[
 578                                  p_input->stream.p_selected_area->i_id + 1 ];
 579
 580         p_area->i_part = 1;
 581         VCDSetArea( p_input, p_area );
 582     }
 583
 584     vlc_mutex_unlock( &p_input->stream.stream_lock );
 585
 586     return( i_packet + 1 );
 587 }
 588
 589 /*****************************************************************************
 590  * VCDRewind : reads a stream backward
 591  *****************************************************************************/
 592 static int VCDRewind( input_thread_t * p_input )
 593 {
 594     return( -1 );
 595 }
 596
 597 /****************************************************************************
 598  * VCDSeek
 599  ****************************************************************************/
 600 static void VCDSeek( input_thread_t * p_input, off_t i_off )
 601 {
 602     thread_vcd_data_t *               p_vcd;
 603
 604     p_vcd = (thread_vcd_data_t *) p_input->p_plugin_data;
 605
 606     p_vcd->i_sector = p_vcd->p_sectors[p_vcd->i_track]
 607                        + i_off / (off_t)VCD_DATA_SIZE;
 608
 609     p_input->stream.p_selected_area->i_tell =
 610         (off_t)p_vcd->i_sector * (off_t)VCD_DATA_SIZE
 611          - p_input->stream.p_selected_area->i_start;
 612 }
 613