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 #define MODULE_NAME vcd
  24 #include "modules_inner.h"
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #include "defs.h"
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33
  34 #ifdef HAVE_UNISTD_H
  35 #   include <unistd.h>
  36 #endif
  37
  38 #include <fcntl.h>
  39 #include <sys/types.h>
  40 #include <string.h>
  41 #include <errno.h>
  42
  43 #ifdef STRNCASECMP_IN_STRINGS_H
  44 #   include <strings.h>
  45 #endif
  46
  47 #if defined( WIN32 )
  48 #   include <io.h>                                                 /* read() */
  49 #else
  50 #   include <sys/uio.h>                                      /* struct iovec */
  51 #endif
  52
  53 #include "common.h"
  54 #include "intf_msg.h"
  55 #include "threads.h"
  56 #include "mtime.h"
  57 #include "tests.h"
  58
  59 #if defined( WIN32 )
  60 #   include "input_iovec.h"
  61 #endif
  62
  63 #include "stream_control.h"
  64 #include "input_ext-intf.h"
  65 #include "input_ext-dec.h"
  66 #include "input_ext-plugins.h"
  67
  68 #include "debug.h"
  69
  70 #include "modules.h"
  71 #include "modules_export.h"
  72
  73 #include "input_vcd.h"
  74 #include "linux_cdrom_tools.h"
  75
  76 /* how many blocks VCDRead will read in each loop */
  77 #define VCD_BLOCKS_ONCE 4
  78 #define VCD_DATA_ONCE   (2 * VCD_BLOCKS_ONCE)
  79 #define BUFFER_SIZE VCD_DATA_SIZE
  80
  81 /*****************************************************************************
  82  * Local prototypes
  83  *****************************************************************************/
  84 /* called from outside */
  85 static int  VCDProbe        ( probedata_t *p_data );
  86 static void VCDInit         ( struct input_thread_s * );
  87 static int  VCDRead         ( struct input_thread_s *, data_packet_t ** );
  88 static int  VCDSetArea      ( struct input_thread_s *, struct input_area_s * );
  89 static int  VCDSetProgram   ( struct input_thread_s *, pgrm_descriptor_t * );
  90 static void VCDOpen         ( struct input_thread_s *);
  91 static void VCDClose        ( struct input_thread_s *);
  92 static void VCDEnd          ( struct input_thread_s *);
  93 static void VCDSeek         ( struct input_thread_s *, off_t );
  94 static int  VCDRewind       ( struct input_thread_s * );
  95
  96 /*****************************************************************************
  97  * Declare a buffer manager
  98  *****************************************************************************/
  99 #define FLAGS           BUFFERS_NOFLAGS
 100 #define NB_LIFO         2
 101 DECLARE_BUFFERS_EMBEDDED( FLAGS, NB_LIFO );
 102 DECLARE_BUFFERS_INIT( FLAGS, NB_LIFO );
 103 DECLARE_BUFFERS_END( FLAGS, NB_LIFO );
 104 DECLARE_BUFFERS_NEWPACKET( FLAGS, NB_LIFO );
 105 DECLARE_BUFFERS_DELETEPACKET( FLAGS, NB_LIFO, 150 );
 106 DECLARE_BUFFERS_NEWPES( FLAGS, NB_LIFO );
 107 DECLARE_BUFFERS_DELETEPES( FLAGS, NB_LIFO, 150, 150 );
 108
 109
 110 /*****************************************************************************
 111  * Functions exported as capabilities. They are declared as static so that
 112  * we don't pollute the namespace too much.
 113  *****************************************************************************/
 114 void _M( input_getfunctions )( function_list_t * p_function_list )
 115 {
 116 #define input p_function_list->functions.input
 117     p_function_list->pf_probe = VCDProbe;
 118     input.pf_init             = VCDInit;
 119     input.pf_open             = VCDOpen;
 120     input.pf_close            = VCDClose;
 121     input.pf_end              = VCDEnd;
 122     input.pf_init_bit_stream  = InitBitstream;
 123     input.pf_read             = VCDRead;
 124     input.pf_set_area         = VCDSetArea;
 125     input.pf_set_program      = VCDSetProgram;
 126     input.pf_demux            = input_DemuxPS;
 127     input.pf_new_packet       = input_NewPacket;
 128     input.pf_new_pes          = input_NewPES;
 129     input.pf_delete_packet    = input_DeletePacket;
 130     input.pf_delete_pes       = input_DeletePES;
 131     input.pf_rewind           = VCDRewind;
 132     input.pf_seek             = VCDSeek;
 133 #undef input
 134 }
 135
 136 /*
 137  * Data reading functions
 138  */
 139
 140 /*****************************************************************************
 141  * VCDProbe: verifies that the stream is a PS stream
 142  *****************************************************************************/
 143 static int VCDProbe( probedata_t *p_data )
 144 {
 145     input_thread_t * p_input = (input_thread_t *)p_data;
 146
 147     char * psz_name = p_input->p_source;
 148     int i_score = 5;
 149
 150     if( TestMethod( INPUT_METHOD_VAR, "vcd" ) )
 151     {
 152         return( 999 );
 153     }
 154
 155     if( ( strlen(psz_name) > 4 ) && !strncasecmp( psz_name, "vcd:", 4 ) )
 156     {
 157         /* If the user specified "vcd:" then it's probably a VCD */
 158         i_score = 100;
 159         psz_name += 4;
 160     }
 161
 162     return( i_score );
 163 }
 164
 165 /*****************************************************************************
 166  * VCDOpen: open vcd
 167  *****************************************************************************/
 168 static void VCDOpen( struct input_thread_s *p_input )
 169 {
 170     vlc_mutex_lock( &p_input->stream.stream_lock );
 171
 172     /* If we are here we can control the pace... */
 173     p_input->stream.b_pace_control = 1;
 174
 175     p_input->stream.b_seekable = 1;
 176     p_input->stream.p_selected_area->i_size = 0;
 177     p_input->stream.p_selected_area->i_tell = 0;
 178
 179     vlc_mutex_unlock( &p_input->stream.stream_lock );
 180
 181     /* XXX: put this shit in an access plugin */
 182     if( strlen( p_input->p_source ) > 4
 183          && !strncasecmp( p_input->p_source, "vcd:", 4 ) )
 184     {
 185         p_input->i_handle
 186             = open( p_input->p_source + 4, O_RDONLY | O_NONBLOCK );
 187     }
 188     else
 189     {
 190         p_input->i_handle
 191             = open( p_input->p_source + 4, O_RDONLY | O_NONBLOCK );
 192     }
 193
 194     if( p_input->i_handle == -1 )
 195     {
 196         p_input->b_error = 1;
 197     }
 198 }
 199
 200 /*****************************************************************************
 201  * VCDClose: close vcd
 202  *****************************************************************************/
 203 static void VCDClose( struct input_thread_s *p_input )
 204 {
 205     close( p_input->i_handle );
 206 }
 207
 208 /*****************************************************************************
 209  * VCDInit: initializes VCD structures
 210  *****************************************************************************/
 211 static void VCDInit( input_thread_t * p_input )
 212 {
 213     thread_vcd_data_t *  p_vcd;
 214     int                  i_title;
 215     int                  i_chapter;
 216     int                  i;
 217     input_area_t *       p_area;
 218     es_descriptor_t *    p_es;
 219
 220     p_vcd = malloc( sizeof(thread_vcd_data_t) );
 221
 222     if( p_vcd == NULL )
 223     {
 224         intf_ErrMsg( "vcd error: out of memory" );
 225         p_input->b_error = 1;
 226         return;
 227     }
 228
 229     p_input->p_plugin_data = (void *)p_vcd;
 230
 231     if( (p_input->p_method_data = input_BuffersInit()) == NULL )
 232     {
 233         p_input->b_error = 1;
 234         return;
 235     }
 236
 237     p_vcd->i_handle = p_input->i_handle;
 238     p_vcd->b_end_of_track = 0;
 239
 240     /* we read the Table Of Content information */
 241     if ( VCDReadToc( p_vcd ) == -1 )
 242     {
 243         intf_ErrMsg( "vcd error: could not read TOC" );
 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
 256 #define area p_input->stream.pp_areas
 257     for( i = 1 ; i <= p_vcd->nb_tracks - 1 ; i++ )
 258     {
 259         input_AddArea( p_input );
 260
 261         /* Titles are Program Chains */
 262         area[i]->i_id = i;
 263
 264         /* Absolute start offset and size */
 265         area[i]->i_start = p_vcd->p_sectors[i];
 266         area[i]->i_size = p_vcd->p_sectors[i+1] - p_vcd->p_sectors[i];
 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 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,
 321                 p_input->stream.p_selected_program, 0xc0, 0 );
 322     p_es->i_stream_id = 0xc0;
 323     p_es->i_type = MPEG1_AUDIO_ES;
 324     p_es->b_audio = 1;
 325     p_es->i_cat = AUDIO_ES;
 326
 327     if( p_main->b_audio )
 328     {
 329         input_SelectES( p_input, p_es );
 330     }
 331
 332     vlc_mutex_unlock( &p_input->stream.stream_lock );
 333 }
 334
 335 /*****************************************************************************
 336  * VCDEnd: frees unused data
 337  *****************************************************************************/
 338 static void VCDEnd( input_thread_t * p_input )
 339 {
 340     thread_vcd_data_t *     p_vcd;
 341
 342     p_vcd = (thread_vcd_data_t*)p_input->p_plugin_data;
 343
 344     free( p_vcd );
 345
 346     input_BuffersEnd( p_input->p_method_data );
 347 }
 348
 349 /*****************************************************************************
 350  * VCDSetProgram: Does nothing since a VCD is mono_program
 351  *****************************************************************************/
 352 static int VCDSetProgram( input_thread_t * p_input,
 353                           pgrm_descriptor_t * p_program)
 354 {
 355     return 0;
 356 }
 357
 358
 359 /*****************************************************************************
 360  * VCDSetArea: initialize input data for title x, chapter y.
 361  * It should be called for each user navigation request.
 362  ****************************************************************************/
 363 static int VCDSetArea( input_thread_t * p_input, input_area_t * p_area )
 364 {
 365     thread_vcd_data_t *     p_vcd;
 366
 367     p_vcd = (thread_vcd_data_t*)p_input->p_plugin_data;
 368
 369     /* we can't use the interface slider until initilization is complete */
 370     p_input->stream.b_seekable = 0;
 371
 372     if( p_area != p_input->stream.p_selected_area )
 373     {
 374         /* Reset the Chapter position of the current title */
 375         p_input->stream.p_selected_area->i_part = 1;
 376         p_input->stream.p_selected_area->i_tell = 0;
 377
 378         /* Change the default area */
 379         p_input->stream.p_selected_area = p_area;
 380
 381         /* Change the current track */
 382         /* The first track is not a valid one  */
 383         p_vcd->i_track = p_area->i_id;
 384         p_vcd->i_sector = p_vcd->p_sectors[p_vcd->i_track];
 385     }
 386
 387     /* warn interface that something has changed */
 388     p_input->stream.b_seekable = 1;
 389     p_input->stream.b_changed = 1;
 390
 391     return 0;
 392 }
 393
 394 /*****************************************************************************
 395  * VCDRead: reads from the VCD into PES packets.
 396  *****************************************************************************
 397  * Returns -1 in case of error, 0 in case of EOF, otherwise the number of
 398  * packets.
 399  *****************************************************************************/
 400 static int VCDRead( input_thread_t * p_input, data_packet_t ** pp_data )
 401 {
 402     thread_vcd_data_t *     p_vcd;
 403     data_packet_t *         p_data;
 404     int                     i_packet_size;
 405     int                     i_index;
 406     int                     i_packet;
 407     u32                     i_header;
 408     byte_t                  p_buffer[ VCD_DATA_SIZE ];
 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             && !p_vcd->b_end_of_track )
 418     {
 419         if ( VCDReadSector( p_vcd, p_buffer ) == -1 )
 420         {
 421             return -1;
 422         }
 423
 424         i_index = 0;
 425
 426         while( i_index < BUFFER_SIZE - 6
 427                 && !p_vcd->b_end_of_track
 428                 && i_packet < VCD_DATA_ONCE )
 429         {
 430             i_header = U32_AT(p_buffer + i_index);
 431
 432             /* This is not the startcode of a packet. Read the stream
 433              * until we find one. */
 434             if( !i_header )
 435             {
 436                 /* It is common for MPEG-1 streams to pad with zeros
 437                  * (although it is forbidden by the recommendation), so
 438                  * don't bother everybody in this case. */
 439                 intf_WarnMsg( 3, "vcd warning: garbage at input" );
 440             }
 441
 442             while( (i_header & 0xFFFFFF00) != 0x100L
 443                      && (++i_index < BUFFER_SIZE - 4) )
 444             {
 445                 i_header = U32_AT(p_buffer + i_index);
 446             }
 447
 448             if( (i_header & 0xFFFFFF00) != 0x100L )
 449             {
 450                 intf_WarnMsg( 3, "vcd warning: no packet at sector %d\n",
 451                                  p_vcd->i_sector - 1 );
 452                 break; /* go to the next sector */
 453             }
 454 #ifdef DEBUG
 455             intf_DbgMsg( "packet start code : %X\n", i_header );
 456 #endif
 457
 458             switch( i_header )
 459             {
 460                 /* 0x1b9 == SYSTEM_END_CODE, it is only 4 bytes long. */
 461                 case 0x1b9:
 462                     i_packet_size = -2;
 463                     break;
 464
 465                 /* Pack header */
 466                 case 0x1ba:
 467                     if( ( *( p_buffer + ( i_index + 4 ) ) & 0xC0) == 0x40 )
 468                     {
 469                         /* MPEG-2 */
 470                         i_packet_size = 8;
 471                     }
 472                     else if( (*(p_buffer + ( i_index + 4 ) ) & 0xF0) == 0x20 )
 473                     {
 474                         /* MPEG-1 */
 475                         i_packet_size = 6;
 476                     }
 477                     else
 478                     {
 479                         intf_ErrMsg( "Unable to determine stream type" );
 480                         return( -1 );
 481                     }
 482                     break;
 483
 484                 /* The packet is at least 6 bytes long. */
 485                 default:
 486                     /* That's the case for all packets, except pack header. */
 487                     i_packet_size = U16_AT((p_buffer + ( i_index + 4 )));
 488                     break;
 489             }
 490
 491             intf_DbgMsg("i_index : %d\n", i_index);
 492             intf_DbgMsg("i_packet_size : %d\n", i_packet_size);
 493
 494             if ( i_index + i_packet_size > BUFFER_SIZE )
 495             {
 496                 intf_ErrMsg( "vcd error: packet too long (%i)",
 497                              i_index + i_packet_size );
 498                 continue;
 499             }
 500
 501             /* Fetch a packet of the appropriate size. */
 502             p_data = p_input->pf_new_packet( p_input->p_method_data,
 503                                              i_packet_size + 6 );
 504
 505             if( p_data == NULL )
 506             {
 507                 intf_ErrMsg( "vcd error: out of memory" );
 508                 return( -1 );
 509             }
 510
 511             if( U32_AT(p_buffer) != 0x1B9 )
 512             {
 513                 p_main->fast_memcpy( p_data->p_demux_start, p_buffer + i_index,
 514                                      6 + i_packet_size );
 515                 i_index += ( 6 + i_packet_size );
 516             }
 517             else
 518             {
 519                 /* Copy the small header. */
 520                 memcpy( p_data->p_demux_start, p_buffer + i_index, 4 );
 521                 i_index += 4;
 522             }
 523
 524             /* Give the packet to the other input stages. */
 525             *pp_data = p_data;
 526             pp_data = &p_data->p_next;
 527         }
 528     }
 529
 530     vlc_mutex_lock( &p_input->stream.stream_lock );
 531
 532     p_input->stream.p_selected_area->i_tell =
 533         p_vcd->i_sector - p_input->stream.p_selected_area->i_start;
 534
 535     /* no chapter for the moment*/
 536     /*if( b_eoc )
 537     {
 538         * We modify i_part only at end of chapter not to erase
 539          * some modification from the interface *
 540         p_input->stream.p_selected_area->i_part = p_vcd->i_chapter;
 541     }*/
 542
 543     if( p_vcd->b_end_of_track )
 544     {
 545         input_area_t *p_area;
 546
 547         /* EOF ? */
 548         if( p_vcd->i_track >= p_vcd->nb_tracks - 1 )
 549         {
 550             vlc_mutex_unlock( &p_input->stream.stream_lock );
 551             return 0;
 552         }
 553
 554         intf_WarnMsg( 4, "vcd info: new title" );
 555
 556         p_vcd->b_end_of_track = 0;
 557
 558         p_area = p_input->stream.pp_areas[
 559                                  p_input->stream.p_selected_area->i_id + 1 ];
 560
 561         p_area->i_part = 1;
 562         VCDSetArea( p_input, p_area );
 563     }
 564
 565     vlc_mutex_unlock( &p_input->stream.stream_lock );
 566
 567     return( i_packet + 1 );
 568 }
 569
 570 /*****************************************************************************
 571  * VCDRewind : reads a stream backward
 572  *****************************************************************************/
 573 static int VCDRewind( input_thread_t * p_input )
 574 {
 575     return( -1 );
 576 }
 577
 578 /****************************************************************************
 579  * VCDSeek
 580  ****************************************************************************/
 581 static void VCDSeek( input_thread_t * p_input, off_t i_off )
 582 {
 583     thread_vcd_data_t *               p_vcd;
 584
 585     p_vcd = (thread_vcd_data_t *) p_input->p_plugin_data;
 586
 587     p_vcd->i_sector = p_vcd->p_sectors[p_vcd->i_track] + i_off;
 588
 589     p_input->stream.p_selected_area->i_tell = p_vcd->i_sector
 590         - p_input->stream.p_selected_area->i_start;
 591 }
 592