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        ( struct input_thread_s * );
  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     input.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( input_thread_t * p_input )
 132 {
 133     char * psz_name = p_input->p_source;
 134
 135     if( ( strlen(psz_name) > 4 ) && !strncasecmp( psz_name, "vcd:", 4 ) )
 136     {
 137         /* If the user specified "vcd:" then it's probably a VCD */
 138         return 0;
 139     }
 140
 141     return -1;
 142 }
 143
 144 /*****************************************************************************
 145  * VCDOpen: open vcd
 146  *****************************************************************************/
 147 static void VCDOpen( struct input_thread_s *p_input )
 148 {
 149     vlc_mutex_lock( &p_input->stream.stream_lock );
 150
 151     /* If we are here we can control the pace... */
 152     p_input->stream.b_pace_control = 1;
 153
 154     p_input->stream.b_seekable = 1;
 155     p_input->stream.p_selected_area->i_size = 0;
 156     p_input->stream.p_selected_area->i_tell = 0;
 157
 158     vlc_mutex_unlock( &p_input->stream.stream_lock );
 159
 160     /* XXX: put this shit in an access plugin */
 161     if( strlen( p_input->p_source ) > 4
 162          && !strncasecmp( p_input->p_source, "vcd:", 4 ) )
 163     {
 164         p_input->i_handle
 165             = open( p_input->p_source + 4, O_RDONLY | O_NONBLOCK );
 166     }
 167     else
 168     {
 169         p_input->i_handle
 170             = open( p_input->p_source, O_RDONLY | O_NONBLOCK );
 171     }
 172
 173     if( p_input->i_handle == -1 )
 174     {
 175         p_input->b_error = 1;
 176     }
 177 }
 178
 179 /*****************************************************************************
 180  * VCDClose: close vcd
 181  *****************************************************************************/
 182 static void VCDClose( struct input_thread_s *p_input )
 183 {
 184     close( p_input->i_handle );
 185 }
 186
 187 /*****************************************************************************
 188  * VCDInit: initializes VCD structures
 189  *****************************************************************************/
 190 static void VCDInit( input_thread_t * p_input )
 191 {
 192     thread_vcd_data_t *  p_vcd;
 193     int                  i_title;
 194     int                  i_chapter;
 195     int                  i;
 196     input_area_t *       p_area;
 197     es_descriptor_t *    p_es;
 198
 199     p_vcd = malloc( sizeof(thread_vcd_data_t) );
 200
 201     if( p_vcd == NULL )
 202     {
 203         intf_ErrMsg( "vcd error: out of memory" );
 204         p_input->b_error = 1;
 205         return;
 206     }
 207
 208     p_input->p_plugin_data = (void *)p_vcd;
 209
 210     if( (p_input->p_method_data = input_BuffersInit()) == NULL )
 211     {
 212         free( p_vcd );
 213         p_input->b_error = 1;
 214         return;
 215     }
 216
 217     p_vcd->i_handle = p_input->i_handle;
 218
 219     /* We read the Table Of Content information */
 220     p_vcd->nb_tracks = ioctl_GetTrackCount( p_input->i_handle );
 221     if( p_vcd->nb_tracks < 0 )
 222     {
 223         input_BuffersEnd( p_input->p_method_data );
 224         free( p_vcd );
 225         p_input->b_error = 1;
 226         return;
 227     }
 228     else if( p_vcd->nb_tracks <= 1 )
 229     {
 230         intf_ErrMsg( "input error: no movie tracks found" );
 231         input_BuffersEnd( p_input->p_method_data );
 232         free( p_vcd );
 233         p_input->b_error = 1;
 234         return;
 235     }
 236
 237     p_vcd->p_sectors = ioctl_GetSectors( p_input->i_handle );
 238     if ( p_vcd->p_sectors == NULL )
 239     {
 240         input_BuffersEnd( p_input->p_method_data );
 241         free( p_vcd );
 242         p_input->b_error = 1;
 243         return;
 244     }
 245
 246     /* Set stream and area data */
 247     vlc_mutex_lock( &p_input->stream.stream_lock );
 248
 249     /* Initialize ES structures */
 250     input_InitStream( p_input, sizeof( stream_ps_data_t ) );
 251
 252     /* disc input method */
 253     p_input->stream.i_method = INPUT_METHOD_VCD;
 254
 255 #define area p_input->stream.pp_areas
 256     for( i = 1 ; i <= p_vcd->nb_tracks - 1 ; i++ )
 257     {
 258         input_AddArea( p_input );
 259
 260         /* Titles are Program Chains */
 261         area[i]->i_id = i;
 262
 263         /* Absolute start offset and size */
 264         area[i]->i_start = (off_t)p_vcd->p_sectors[i] * (off_t)VCD_DATA_SIZE;
 265         area[i]->i_size = (off_t)(p_vcd->p_sectors[i+1] - p_vcd->p_sectors[i])
 266                            * (off_t)VCD_DATA_SIZE;
 267
 268         /* Number of chapters */
 269         area[i]->i_part_nb = 0;   // will be the entry points
 270         area[i]->i_part = 1;
 271
 272         /* Number of angles */
 273         area[i]->i_angle_nb = 1; // no angle support in VCDs
 274         area[i]->i_angle = 1;
 275
 276         area[i]->i_plugin_data = p_vcd->p_sectors[i];
 277     }
 278 #undef area
 279
 280     /* Get requested title - if none try the first title */
 281     i_title = main_GetIntVariable( INPUT_TITLE_VAR, 1 );
 282     if( i_title <= 0 )
 283     {
 284         i_title = 1;
 285     }
 286
 287     // p_vcd->i_track = i_title-1;
 288
 289     /* Get requested chapter - if none defaults to first one */
 290     i_chapter = main_GetIntVariable( INPUT_CHAPTER_VAR, 1 );
 291     if( i_chapter <= 0 )
 292     {
 293         i_chapter = 1;
 294     }
 295
 296     p_input->stream.pp_areas[i_title]->i_part = i_chapter;
 297
 298     p_area = p_input->stream.pp_areas[i_title];
 299
 300     VCDSetArea( p_input, p_area );
 301
 302     /* Set program information. */
 303
 304     input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
 305     p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
 306
 307     /* No PSM to read in disc mode, we already have all the information */
 308     p_input->stream.p_selected_program->b_is_ok = 1;
 309
 310     p_es = input_AddES( p_input, p_input->stream.p_selected_program, 0xe0, 0 );
 311     p_es->i_stream_id = 0xe0;
 312     p_es->i_type = MPEG1_VIDEO_ES;
 313     p_es->i_cat = VIDEO_ES;
 314
 315     if( p_main->b_video )
 316     {
 317         input_SelectES( p_input, p_es );
 318     }
 319
 320     p_es = input_AddES( p_input, p_input->stream.p_selected_program, 0xc0, 0 );
 321     p_es->i_stream_id = 0xc0;
 322     p_es->i_type = MPEG1_AUDIO_ES;
 323     p_es->b_audio = 1;
 324     p_es->i_cat = AUDIO_ES;
 325
 326     if( p_main->b_audio )
 327     {
 328         input_SelectES( p_input, p_es );
 329     }
 330
 331     vlc_mutex_unlock( &p_input->stream.stream_lock );
 332 }
 333
 334 /*****************************************************************************
 335  * VCDEnd: frees unused data
 336  *****************************************************************************/
 337 static void VCDEnd( input_thread_t * p_input )
 338 {
 339     thread_vcd_data_t *     p_vcd;
 340
 341     input_BuffersEnd( p_input->p_method_data );
 342
 343     p_vcd = (thread_vcd_data_t*)p_input->p_plugin_data;
 344
 345     free( p_vcd );
 346 }
 347
 348 /*****************************************************************************
 349  * VCDSetProgram: Does nothing since a VCD is mono_program
 350  *****************************************************************************/
 351 static int VCDSetProgram( input_thread_t * p_input,
 352                           pgrm_descriptor_t * p_program)
 353 {
 354     return 0;
 355 }
 356
 357
 358 /*****************************************************************************
 359  * VCDSetArea: initialize input data for title x, chapter y.
 360  * It should be called for each user navigation request.
 361  ****************************************************************************/
 362 static int VCDSetArea( input_thread_t * p_input, input_area_t * p_area )
 363 {
 364     thread_vcd_data_t *     p_vcd;
 365
 366     p_vcd = (thread_vcd_data_t*)p_input->p_plugin_data;
 367
 368     /* we can't use the interface slider until initilization is complete */
 369     p_input->stream.b_seekable = 0;
 370
 371     if( p_area != p_input->stream.p_selected_area )
 372     {
 373         /* Reset the Chapter position of the current title */
 374         p_input->stream.p_selected_area->i_part = 1;
 375         p_input->stream.p_selected_area->i_tell = 0;
 376
 377         /* Change the default area */
 378         p_input->stream.p_selected_area = p_area;
 379
 380         /* Change the current track */
 381         /* The first track is not a valid one  */
 382         p_vcd->i_track = p_area->i_id;
 383         p_vcd->i_sector = p_vcd->p_sectors[p_vcd->i_track];
 384     }
 385
 386     /* warn interface that something has changed */
 387     p_input->stream.b_seekable = 1;
 388     p_input->stream.b_changed = 1;
 389
 390     return 0;
 391 }
 392
 393 /*****************************************************************************
 394  * VCDRead: reads from the VCD into PES packets.
 395  *****************************************************************************
 396  * Returns -1 in case of error, 0 in case of EOF, otherwise the number of
 397  * packets.
 398  *****************************************************************************/
 399 static int VCDRead( input_thread_t * p_input, data_packet_t ** pp_data )
 400 {
 401     thread_vcd_data_t *     p_vcd;
 402     data_packet_t *         p_data;
 403     int                     i_packet_size;
 404     int                     i_index;
 405     int                     i_packet;
 406     u32                     i_header;
 407     byte_t                  p_buffer[ VCD_DATA_SIZE ];
 408     boolean_t               b_eot = 0; /* end of track */
 409     /* boolean_t               b_eoc; No chapters yet */
 410
 411     p_vcd = (thread_vcd_data_t *)p_input->p_plugin_data;
 412
 413     i_packet = 0;
 414     *pp_data = NULL;
 415
 416     while( i_packet < VCD_DATA_ONCE )
 417     {
 418         if( ioctl_ReadSector( p_vcd->i_handle, p_vcd->i_sector, p_buffer ) )
 419         {
 420             /* Read error, but assume we reached the end of the track */
 421             b_eot = 1;
 422             break;
 423         }
 424
 425         p_vcd->i_sector++;
 426
 427         if( p_vcd->i_sector >= p_vcd->p_sectors[p_vcd->i_track + 1] )
 428         {
 429             b_eot = 1;
 430             break;
 431         }
 432
 433         i_index = 0;
 434
 435         while( i_index < BUFFER_SIZE-6 && i_packet < VCD_DATA_ONCE )
 436         {
 437             i_header = U32_AT(p_buffer + i_index);
 438
 439             /* It is common for MPEG-1 streams to pad with zeros
 440              * (although it is forbidden by the recommendation), so
 441              * don't bother everybody in this case. */
 442             while( !i_header && (++i_index < BUFFER_SIZE - 4) )
 443             {
 444                 i_header = U32_AT(p_buffer + i_index);
 445             }
 446
 447             if( !i_header )
 448             {
 449                 intf_WarnMsg( 12, "vcd warning: zero-padded packet" );
 450                 break;
 451             }
 452
 453             /* Read the stream until we find a startcode. */
 454             while( (i_header & 0xFFFFFF00) != 0x100L
 455                      && (++i_index < BUFFER_SIZE - 4) )
 456             {
 457                 i_header = U32_AT(p_buffer + i_index);
 458             }
 459
 460             if( (i_header & 0xFFFFFF00) != 0x100L )
 461             {
 462                 intf_WarnMsg( 3, "vcd warning: no packet at sector %d",
 463                                  p_vcd->i_sector - 1 );
 464                 break; /* go to the next sector */
 465             }
 466
 467             switch( i_header )
 468             {
 469                 /* 0x1b9 == SYSTEM_END_CODE, it is only 4 bytes long. */
 470                 case 0x1b9:
 471                     i_packet_size = -2;
 472                     break;
 473
 474                 /* Pack header */
 475                 case 0x1ba:
 476                     if( ( *( p_buffer + ( i_index + 4 ) ) & 0xC0) == 0x40 )
 477                     {
 478                         /* MPEG-2 */
 479                         i_packet_size = 8;
 480                     }
 481                     else if( (*(p_buffer + ( i_index + 4 ) ) & 0xF0) == 0x20 )
 482                     {
 483                         /* MPEG-1 */
 484                         i_packet_size = 6;
 485                     }
 486                     else
 487                     {
 488                         intf_ErrMsg( "vcd error: unable to determine "
 489                                      "stream type" );
 490                         return( -1 );
 491                     }
 492                     break;
 493
 494                 /* The packet is at least 6 bytes long. */
 495                 default:
 496                     /* That's the case for all packets, except pack header. */
 497                     i_packet_size = U16_AT((p_buffer + ( i_index + 4 )));
 498                     break;
 499             }
 500
 501             if ( i_index + i_packet_size > BUFFER_SIZE )
 502             {
 503                 intf_ErrMsg( "vcd error: packet too long (%i)",
 504                              i_index + i_packet_size );
 505                 continue;
 506             }
 507
 508             /* Fetch a packet of the appropriate size. */
 509             p_data = p_input->pf_new_packet( p_input->p_method_data,
 510                                              i_packet_size + 6 );
 511
 512             if( p_data == NULL )
 513             {
 514                 intf_ErrMsg( "vcd error: out of memory" );
 515                 return( -1 );
 516             }
 517
 518             if( U32_AT(p_buffer) != 0x1B9 )
 519             {
 520                 FAST_MEMCPY( p_data->p_demux_start, p_buffer + i_index,
 521                              6 + i_packet_size );
 522                 i_index += ( 6 + i_packet_size );
 523             }
 524             else
 525             {
 526                 /* Copy the small header. */
 527                 memcpy( p_data->p_demux_start, p_buffer + i_index, 4 );
 528                 i_index += 4;
 529             }
 530
 531             /* Give the packet to the other input stages. */
 532             *pp_data = p_data;
 533             pp_data = &p_data->p_next;
 534
 535             i_packet++;
 536         }
 537     }
 538
 539     vlc_mutex_lock( &p_input->stream.stream_lock );
 540
 541     p_input->stream.p_selected_area->i_tell =
 542         (off_t)p_vcd->i_sector * (off_t)VCD_DATA_SIZE
 543           - p_input->stream.p_selected_area->i_start;
 544
 545     /* no chapter for the moment*/
 546 #if 0
 547     if( b_eoc )
 548     {
 549         /* We modify i_part only at end of chapter not to erase
 550          * some modification from the interface */
 551         p_input->stream.p_selected_area->i_part = p_vcd->i_chapter;
 552     }
 553 #endif
 554
 555     if( b_eot )
 556     {
 557         input_area_t *p_area;
 558
 559         /* EOF ? */
 560         if( p_vcd->i_track >= p_vcd->nb_tracks - 1 )
 561         {
 562             vlc_mutex_unlock( &p_input->stream.stream_lock );
 563             return 0;
 564         }
 565
 566         intf_WarnMsg( 4, "vcd info: new title" );
 567
 568         p_area = p_input->stream.pp_areas[
 569                                  p_input->stream.p_selected_area->i_id + 1 ];
 570
 571         p_area->i_part = 1;
 572         VCDSetArea( p_input, p_area );
 573     }
 574
 575     vlc_mutex_unlock( &p_input->stream.stream_lock );
 576
 577     return( i_packet + 1 );
 578 }
 579
 580 /*****************************************************************************
 581  * VCDRewind : reads a stream backward
 582  *****************************************************************************/
 583 static int VCDRewind( input_thread_t * p_input )
 584 {
 585     return( -1 );
 586 }
 587
 588 /****************************************************************************
 589  * VCDSeek
 590  ****************************************************************************/
 591 static void VCDSeek( input_thread_t * p_input, off_t i_off )
 592 {
 593     thread_vcd_data_t *               p_vcd;
 594
 595     p_vcd = (thread_vcd_data_t *) p_input->p_plugin_data;
 596
 597     p_vcd->i_sector = p_vcd->p_sectors[p_vcd->i_track]
 598                        + i_off / (off_t)VCD_DATA_SIZE;
 599
 600     p_input->stream.p_selected_area->i_tell =
 601         (off_t)p_vcd->i_sector * (off_t)VCD_DATA_SIZE
 602          - p_input->stream.p_selected_area->i_start;
 603 }
 604