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 "../mpeg_system/input_ps.h"
  74 #include "input_vcd.h"
  75 #include "linux_cdrom_tools.h"
  76
  77 /* how many blocks VCDRead will read in each loop */
  78 #define VCD_BLOCKS_ONCE 64
  79 #define VCD_DATA_ONCE  (2 * VCD_BLOCKS_ONCE)
  80 #define BUFFER_SIZE VCD_DATA_SIZE
  81
  82
  83
  84 /*****************************************************************************
  85  * Local prototypes
  86  *****************************************************************************/
  87 /* called from outside */
  88 static int  VCDProbe        ( probedata_t *p_data );
  89 static void VCDInit         ( struct input_thread_s * );
  90 static int  VCDRead         ( struct input_thread_s *, data_packet_t ** );
  91 static int  VCDSetArea      ( struct input_thread_s *, struct input_area_s * );
  92 static int  VCDSetProgram   ( struct input_thread_s *, pgrm_descriptor_t * );
  93 static void VCDOpen         ( struct input_thread_s *);
  94 static void VCDClose         ( struct input_thread_s *);
  95 static void VCDEnd          ( struct input_thread_s *);
  96 static void VCDSeek         ( struct input_thread_s *, off_t );
  97 static int  VCDRewind       ( struct input_thread_s * );
  98
  99 /*****************************************************************************
 100  * Declare a buffer manager
 101  *****************************************************************************/
 102 #define FLAGS           BUFFERS_NOFLAGS
 103 #define NB_LIFO         2
 104 DECLARE_BUFFERS_EMBEDDED( FLAGS, NB_LIFO );
 105 DECLARE_BUFFERS_INIT( FLAGS, NB_LIFO );
 106 DECLARE_BUFFERS_END( FLAGS, NB_LIFO );
 107 DECLARE_BUFFERS_NEWPACKET( FLAGS, NB_LIFO );
 108 DECLARE_BUFFERS_DELETEPACKET( FLAGS, NB_LIFO, 150 );
 109 DECLARE_BUFFERS_NEWPES( FLAGS, NB_LIFO );
 110 DECLARE_BUFFERS_DELETEPES( FLAGS, NB_LIFO, 150 );
 111
 112
 113 /*****************************************************************************
 114  * Functions exported as capabilities. They are declared as static so that
 115  * we don't pollute the namespace too much.
 116  *****************************************************************************/
 117 void _M( input_getfunctions )( function_list_t * p_function_list )
 118 {
 119 #define input p_function_list->functions.input
 120     p_function_list->pf_probe = VCDProbe;
 121     input.pf_init             = VCDInit;
 122     input.pf_open             = VCDOpen;
 123     input.pf_close            = VCDClose;
 124     input.pf_end              = VCDEnd;
 125     input.pf_init_bit_stream  = InitBitstream;
 126     input.pf_read             = VCDRead;
 127     input.pf_set_area         = VCDSetArea;
 128     input.pf_set_program      = VCDSetProgram;
 129     input.pf_demux            = input_DemuxPS;
 130     input.pf_new_packet       = input_NewPacket;
 131     input.pf_new_pes          = input_NewPES;
 132     input.pf_delete_packet    = input_DeletePacket;
 133     input.pf_delete_pes       = input_DeletePES;
 134     input.pf_rewind           = VCDRewind;
 135     input.pf_seek             = VCDSeek;
 136 #undef input
 137 }
 138
 139 /*
 140  * Data reading functions
 141  */
 142
 143 /*****************************************************************************
 144  * VCDProbe: verifies that the stream is a PS stream
 145  *****************************************************************************/
 146 static int VCDProbe( probedata_t *p_data )
 147 {
 148
 149     input_thread_t * p_input = (input_thread_t *)p_data;
 150
 151     char * psz_name = p_input->p_source;
 152     int i_score = 5;
 153
 154     if( TestMethod( INPUT_METHOD_VAR, "vcd" ) )
 155     {
 156         return( 999 );
 157     }
 158
 159     if( ( strlen(psz_name) > 4 ) && !strncasecmp( psz_name, "vcd:", 4 ) )
 160     {
 161         /* If the user specified "vcd:" then it's probably a VCD */
 162         i_score = 100;
 163         psz_name += 4;
 164     }
 165     return( i_score );
 166 }
 167
 168 /*****************************************************************************
 169  * VCDOpen: open vcd
 170  *****************************************************************************/
 171 static void VCDOpen( struct input_thread_s *p_input )
 172 {
 173     int vcdhandle;
 174
 175     vlc_mutex_lock( &p_input->stream.stream_lock );
 176
 177     /* If we are here we can control the pace... */
 178     p_input->stream.b_pace_control = 1;
 179
 180     p_input->stream.b_seekable = 1;
 181     p_input->stream.p_selected_area->i_size = 0;
 182
 183     p_input->stream.p_selected_area->i_tell = 0;
 184
 185     vlc_mutex_unlock( &p_input->stream.stream_lock );
 186
 187
 188     /* XXX: put this shit in an access plugin */
 189     if( strlen( p_input->p_source ) > 4
 190          && !strncasecmp( p_input->p_source, "vcd:", 4 ) )
 191     {
 192         vcdhandle = open( p_input->p_source + 4, O_RDONLY | O_NONBLOCK );
 193     }
 194     else
 195     {
 196         vcdhandle = open( p_input->p_source + 4, O_RDONLY | O_NONBLOCK );
 197     }
 198
 199     if( vcdhandle == -1 )
 200     {
 201         p_input->b_error = 1;
 202         return;
 203     }
 204
 205     p_input->i_handle = (int) vcdhandle;
 206 }
 207
 208 /*****************************************************************************
 209  * VCDClose: close vcd
 210  *****************************************************************************/
 211 static void VCDClose( struct input_thread_s *p_input )
 212 {
 213     close( p_input->i_handle );
 214 }
 215
 216 /*****************************************************************************
 217  * VCDInit: initializes VCD structures
 218  *****************************************************************************/
 219 static void VCDInit( input_thread_t * p_input )
 220 {
 221     thread_vcd_data_t *  p_vcd;
 222     int                  i_title;
 223     int                  i_chapter;
 224     int                  i;
 225     input_area_t *       p_area;
 226     es_descriptor_t *    p_es;
 227
 228     p_vcd = malloc( sizeof(thread_vcd_data_t) );
 229
 230     if( p_vcd == NULL )
 231     {
 232         intf_ErrMsg( "vcd error: out of memory" );
 233         p_input->b_error = 1;
 234         return;
 235     }
 236
 237     p_input->p_plugin_data = (void *)p_vcd;
 238
 239     if( (p_input->p_method_data = input_BuffersInit()) == NULL )
 240     {
 241         p_input->b_error = 1;
 242         return;
 243     }
 244
 245     p_vcd->vcdhandle = p_input->i_handle;
 246     p_vcd->b_end_of_track = 0;
 247
 248     /* we read the Table Of Content information */
 249     if ( read_toc(p_vcd) == -1 )
 250     {
 251         intf_ErrMsg("An error occured when reading vcd's TOC");
 252     }
 253
 254     p_input->i_read_once = VCD_DATA_ONCE;
 255
 256     /* Set stream and area data */
 257     vlc_mutex_lock( &p_input->stream.stream_lock );
 258
 259     /* Initialize ES structures */
 260     input_InitStream( p_input, sizeof( stream_ps_data_t ) );
 261
 262     /* disc input method */
 263     p_input->stream.i_method = INPUT_METHOD_VCD;
 264
 265
 266 #define area p_input->stream.pp_areas
 267     for( i = 1 ; i <= p_vcd->nb_tracks - 1 ; i++ )
 268     {
 269         input_AddArea( p_input );
 270
 271         /* Titles are Program Chains */
 272         area[i]->i_id = i;
 273
 274         /* Absolute start offset and size */
 275         area[i]->i_start = p_vcd->tracks_sector[i];
 276         area[i]->i_size = p_vcd->tracks_sector[i+1] - p_vcd->tracks_sector[i];
 277
 278         /* Number of chapters */
 279         area[i]->i_part_nb = 0;   // will be the entry points
 280         area[i]->i_part = 1;
 281
 282         /* Number of angles */
 283         area[i]->i_angle_nb = 1; // no angle support in VCDs
 284         area[i]->i_angle = 1;
 285
 286         area[i]->i_plugin_data = p_vcd->tracks_sector[i];
 287     }
 288 #undef area
 289
 290     /* Get requested title - if none try the first title */
 291     i_title = main_GetIntVariable( INPUT_TITLE_VAR, 1 );
 292     if( i_title <= 0)
 293     {
 294         i_title = 1;
 295     }
 296
 297     // p_vcd->current_track = i_title-1 ;
 298
 299     /* Get requested chapter - if none defaults to first one */
 300     i_chapter = main_GetIntVariable( INPUT_CHAPTER_VAR, 1 );
 301     if( i_chapter <= 0 )
 302     {
 303         i_chapter = 1;
 304     }
 305
 306
 307     p_input->stream.pp_areas[i_title]->i_part = i_chapter;
 308
 309     p_area = p_input->stream.pp_areas[i_title];
 310
 311     VCDSetArea( p_input, p_area );
 312
 313     /* Set program information. */
 314
 315     input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
 316     p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
 317
 318     /* No PSM to read in disc mode, we already have all information */
 319     p_input->stream.p_selected_program->b_is_ok = 1;
 320
 321     p_es = input_AddES( p_input, p_input->stream.p_selected_program, 0xe0, 0 );
 322     p_es->i_stream_id = 0xe0;
 323     p_es->i_type = MPEG1_VIDEO_ES;
 324     p_es->i_cat = VIDEO_ES;
 325
 326     if( p_main->b_video )
 327     {
 328         input_SelectES( p_input, p_es );
 329     }
 330
 331     p_es = input_AddES( p_input,
 332                 p_input->stream.p_selected_program, 0xc0, 0 );
 333     p_es->i_stream_id = 0xc0;
 334     p_es->i_type = MPEG1_AUDIO_ES;
 335     p_es->b_audio = 1;
 336     p_es->i_cat = AUDIO_ES;
 337
 338     if( p_main->b_audio )
 339     {
 340         input_SelectES( p_input, p_es );
 341     }
 342
 343     vlc_mutex_unlock( &p_input->stream.stream_lock );
 344
 345
 346     return;
 347 }
 348
 349
 350 /*****************************************************************************
 351  * VCDEnd: frees unused data
 352  *****************************************************************************/
 353 static void VCDEnd( input_thread_t * p_input )
 354 {
 355     thread_vcd_data_t *     p_vcd;
 356
 357     p_vcd = (thread_vcd_data_t*)p_input->p_plugin_data;
 358
 359     free( p_vcd );
 360
 361     input_BuffersEnd( p_input->p_method_data );
 362 }
 363
 364 /*****************************************************************************
 365  * VCDSetProgram: Does nothing since a VCD is mono_program
 366  *****************************************************************************/
 367 static int VCDSetProgram( input_thread_t * p_input,
 368             pgrm_descriptor_t * p_program)
 369 {
 370     return 0;
 371 }
 372
 373
 374 /*****************************************************************************
 375  * VCDSetArea: initialize input data for title x, chapter y.
 376  * It should be called for each user navigation request.
 377  ****************************************************************************/
 378 static int VCDSetArea( input_thread_t * p_input, input_area_t * p_area )
 379 {
 380     thread_vcd_data_t *     p_vcd;
 381
 382     p_vcd = (thread_vcd_data_t*)p_input->p_plugin_data;
 383
 384     /* we can't use the interface slider until initilization is complete */
 385     p_input->stream.b_seekable = 0;
 386
 387     if ( p_area != p_input->stream.p_selected_area )
 388     {
 389         /* Reset the Chapter position of the old title */
 390         p_input->stream.p_selected_area->i_part = 0;
 391         p_input->stream.p_selected_area->i_tell = 0;
 392
 393         /* Change the default area */
 394         p_input->stream.p_selected_area = p_area;
 395
 396         /* Change the current track */
 397         /* The first track is not a valid one  */
 398         p_vcd->current_track = p_area->i_id ;
 399         p_vcd->current_sector = p_vcd->tracks_sector[p_vcd->current_track] ;
 400     }
 401     /* warn interface that something has changed */
 402     p_input->stream.b_seekable = 1;
 403     p_input->stream.b_changed = 1;
 404     return 0 ;
 405
 406 }
 407
 408
 409
 410 /*****************************************************************************
 411  * VCDRead: reads from the VCD into PES packets.
 412  *****************************************************************************
 413  * Returns -1 in case of error, 0 if everything went well, and 1 in case of
 414  * EOF.
 415  *****************************************************************************/
 416 static int VCDRead( input_thread_t * p_input,
 417                     data_packet_t ** pp_packets )
 418 {
 419     thread_vcd_data_t *     p_vcd;
 420     data_packet_t *         p_data;
 421     int                     i_packet_size;
 422     int                     i_index;
 423     int                     i_packet;
 424     byte_t *                p_buffer;
 425     boolean_t                  b_no_packet;
 426     /* boolean_t               b_eoc; No chapters yet */
 427
 428     p_vcd = (thread_vcd_data_t *)p_input->p_plugin_data;
 429
 430
 431     p_buffer = malloc ( VCD_DATA_SIZE );
 432
 433     if ( p_buffer == NULL )
 434     {
 435         intf_ErrMsg("Could not malloc the read buffer");
 436         return -1;
 437     }
 438
 439
 440     i_packet = 0;
 441     b_no_packet = 0;
 442
 443     while( i_packet < VCD_DATA_ONCE )
 444     {
 445         i_index = 0;
 446
 447         if ( VCD_sector_read( p_vcd, p_buffer ) == -1 )
 448         {
 449               return -1;
 450         }
 451
 452         while (i_index < BUFFER_SIZE - 6)
 453         {
 454
 455             if( (U32_AT(p_buffer + i_index) & 0xFFFFFF00) != 0x100L )
 456             {
 457                 /* This is not the startcode of a packet. Read the stream
 458                  * until we find one. */
 459
 460                 if( !U32_AT( p_buffer + i_index ) )
 461                 {
 462                     /* It is common for MPEG-1 streams to pad with zeros
 463                      * (although it is forbidden by the recommendation), so
 464                      * don't bother everybody in this case. */
 465                     intf_WarnMsg( 3, "Garbage at input" );
 466                 }
 467
 468                 while( ( (U32_AT(p_buffer + i_index) & 0xFFFFFF00) != 0x100L )
 469                        && ( i_index < BUFFER_SIZE - 4 ) )
 470                 {
 471                     i_index ++;
 472                 }
 473
 474                 if ( i_index == BUFFER_SIZE - 4 )
 475                 {
 476                     b_no_packet = 1;
 477                 }
 478                 /* Packet found. */
 479             }
 480
 481             if (b_no_packet)
 482             {
 483                 b_no_packet = 0;
 484                 intf_WarnMsg(3, "No packet found on sector %d\n",
 485                             p_vcd->current_sector -1 );
 486                 break; /* go to the next sector */
 487             }
 488
 489 #ifdef DEBUG
 490             intf_DbgMsg("packet start code : %X\n",
 491                         U32_AT(p_buffer + i_index));
 492 #endif
 493             /* 0x1B9 == SYSTEM_END_CODE, it is only 4 bytes long. */
 494             if( U32_AT(p_buffer + i_index) != 0x1B9 )
 495             {
 496                 /* The packet is at least 6 bytes long. */
 497
 498                 if( U32_AT(p_buffer + i_index) != 0x1BA )
 499                 {
 500                     /* That's the case for all packets, except pack header. */
 501                     i_packet_size = U16_AT((p_buffer + ( i_index + 4 )));
 502                 }
 503                 else
 504                 {
 505                     /* Pack header. */
 506                     if( ( *( p_buffer + ( i_index + 4 ) ) & 0xC0) == 0x40 )
 507                     {
 508                         /* MPEG-2 */
 509                         i_packet_size = 8;
 510                     }
 511                     else if( (*(p_buffer + ( i_index + 4 ) ) & 0xF0) == 0x20 )
 512                     {
 513                         /* MPEG-1 */
 514                         i_packet_size = 6;
 515                     }
 516                     else
 517                     {
 518                         intf_ErrMsg( "Unable to determine stream type" );
 519                         return( -1 );
 520                     }
 521                 }
 522             }
 523             else
 524             {
 525                 /* System End Code */
 526                 i_packet_size = -2;
 527             }
 528 #ifdef DEBUG
 529             intf_DbgMsg("i_index : %d\n", i_index);
 530             intf_DbgMsg("i_packet_size : %d\n", i_packet_size);
 531 #endif
 532             if ( i_index + i_packet_size > BUFFER_SIZE )
 533             {
 534                 intf_ErrMsg( "input error: packet too long (%i)",
 535                              i_index + i_packet_size );
 536                 continue;
 537             }
 538
 539             /* Fetch a packet of the appropriate size. */
 540
 541             p_data = p_input->pf_new_packet( p_input->p_method_data,
 542                                              i_packet_size + 6 );
 543
 544             if( p_data == NULL )
 545             {
 546                 intf_ErrMsg( "Out of memory" );
 547                 return( -1 );
 548             }
 549
 550             if( U32_AT(p_buffer) != 0x1B9 )
 551             {
 552                 p_main->fast_memcpy( p_data->p_demux_start, p_buffer + i_index,
 553                                      6 + i_packet_size );
 554                 i_index += ( 6 + i_packet_size );
 555
 556             }
 557             else
 558             {
 559                 /* Copy the small header. */
 560                 memcpy( p_data->p_demux_start, p_buffer + i_index, 4 );
 561                 i_index += 4;
 562             }
 563
 564             /* Give the packet to the other input stages. */
 565             pp_packets[i_packet] = p_data;
 566             i_packet ++;
 567         }
 568
 569         if ( p_vcd->b_end_of_track )
 570             break;
 571     }
 572
 573
 574
 575     vlc_mutex_lock( &p_input->stream.stream_lock );
 576
 577     p_input->stream.p_selected_area->i_tell =
 578         p_vcd->current_sector -
 579         p_input->stream.p_selected_area->i_start ;
 580
 581     /* no chapter for the moment*/
 582     /*if( b_eoc )
 583     {
 584         * We modify i_part only at end of chapter not to erase
 585          * some modification from the interface *
 586         p_input->stream.p_selected_area->i_part = p_vcd->i_chapter;
 587     }*/
 588
 589     if( p_vcd->b_end_of_track )
 590     {
 591         input_area_t *p_area;
 592
 593         /* EOF ? */
 594         if( p_vcd->current_track >= p_vcd->nb_tracks - 1 )
 595         {
 596             vlc_mutex_unlock( &p_input->stream.stream_lock );
 597             return 1;
 598         }
 599
 600         intf_WarnMsg( 4, "vcd info: new title" );
 601
 602         p_vcd->b_end_of_track = 0;
 603
 604         p_area = p_input->stream.pp_areas[
 605                                  p_input->stream.p_selected_area->i_id + 1 ];
 606
 607         p_area->i_part = 1;
 608         VCDSetArea( p_input, p_area );
 609     }
 610
 611     vlc_mutex_unlock( &p_input->stream.stream_lock );
 612
 613     return 0;
 614 }
 615
 616 /*****************************************************************************
 617  * VCDRewind : reads a stream backward
 618  *****************************************************************************/
 619 static int VCDRewind( input_thread_t * p_input )
 620 {
 621     return( -1 );
 622 }
 623
 624
 625 /****************************************************************************
 626  * VCDSeek
 627  ****************************************************************************/
 628 static void VCDSeek( input_thread_t * p_input, off_t i_off )
 629 {
 630     thread_vcd_data_t *               p_vcd;
 631
 632     p_vcd = (thread_vcd_data_t *) p_input->p_plugin_data;
 633
 634     p_vcd->current_sector = p_vcd->tracks_sector[p_vcd->current_track]
 635                                 + i_off;
 636
 637     p_input->stream.p_selected_area->i_tell = p_vcd->current_sector
 638         - p_input->stream.p_selected_area->i_start;
 639
 640     return ;
 641 }
 642