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, 1000 );
 106 DECLARE_BUFFERS_NEWPES( FLAGS, NB_LIFO );
 107 DECLARE_BUFFERS_DELETEPES( FLAGS, NB_LIFO, 1000 );
 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         input_BuffersEnd( p_input->p_method_data );
 245         p_input->b_error = 1;
 246         return;
 247     }
 248
 249     /* Set stream and area data */
 250     vlc_mutex_lock( &p_input->stream.stream_lock );
 251
 252     /* Initialize ES structures */
 253     input_InitStream( p_input, sizeof( stream_ps_data_t ) );
 254
 255     /* disc input method */
 256     p_input->stream.i_method = INPUT_METHOD_VCD;
 257
 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 = p_vcd->p_sectors[i];
 269         area[i]->i_size = p_vcd->p_sectors[i+1] - p_vcd->p_sectors[i];
 270
 271         /* Number of chapters */
 272         area[i]->i_part_nb = 0;   // will be the entry points
 273         area[i]->i_part = 1;
 274
 275         /* Number of angles */
 276         area[i]->i_angle_nb = 1; // no angle support in VCDs
 277         area[i]->i_angle = 1;
 278
 279         area[i]->i_plugin_data = p_vcd->p_sectors[i];
 280     }
 281 #undef area
 282
 283     /* Get requested title - if none try the first title */
 284     i_title = main_GetIntVariable( INPUT_TITLE_VAR, 1 );
 285     if( i_title <= 0 )
 286     {
 287         i_title = 1;
 288     }
 289
 290     // p_vcd->i_track = i_title-1;
 291
 292     /* Get requested chapter - if none defaults to first one */
 293     i_chapter = main_GetIntVariable( INPUT_CHAPTER_VAR, 1 );
 294     if( i_chapter <= 0 )
 295     {
 296         i_chapter = 1;
 297     }
 298
 299     p_input->stream.pp_areas[i_title]->i_part = i_chapter;
 300
 301     p_area = p_input->stream.pp_areas[i_title];
 302
 303     VCDSetArea( p_input, p_area );
 304
 305     /* Set program information. */
 306
 307     input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
 308     p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
 309
 310     /* No PSM to read in disc mode, we already have all information */
 311     p_input->stream.p_selected_program->b_is_ok = 1;
 312
 313     p_es = input_AddES( p_input, p_input->stream.p_selected_program, 0xe0, 0 );
 314     p_es->i_stream_id = 0xe0;
 315     p_es->i_type = MPEG1_VIDEO_ES;
 316     p_es->i_cat = VIDEO_ES;
 317
 318     if( p_main->b_video )
 319     {
 320         input_SelectES( p_input, p_es );
 321     }
 322
 323     p_es = input_AddES( p_input,
 324                 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     p_vcd = (thread_vcd_data_t*)p_input->p_plugin_data;
 346
 347     free( p_vcd );
 348
 349     input_BuffersEnd( p_input->p_method_data );
 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_eoc; No chapters yet */
 413
 414     p_vcd = (thread_vcd_data_t *)p_input->p_plugin_data;
 415
 416     i_packet = 0;
 417     *pp_data = NULL;
 418
 419     while( i_packet < VCD_DATA_ONCE && !p_vcd->b_end_of_track )
 420     {
 421         if ( VCDReadSector( p_vcd, p_buffer ) == -1 )
 422         {
 423             return -1;
 424         }
 425
 426         i_index = 0;
 427
 428         while( i_index < BUFFER_SIZE - 6
 429                 && !p_vcd->b_end_of_track
 430                 && i_packet < VCD_DATA_ONCE )
 431         {
 432             i_header = U32_AT(p_buffer + i_index);
 433
 434             /* This is not the startcode of a packet. Read the stream
 435              * until we find one. */
 436             if( !i_header )
 437             {
 438                 /* It is common for MPEG-1 streams to pad with zeros
 439                  * (although it is forbidden by the recommendation), so
 440                  * don't bother everybody in this case. */
 441                 intf_WarnMsg( 12, "vcd warning: garbage at input" );
 442                 break;
 443             }
 444
 445             while( (i_header & 0xFFFFFF00) != 0x100L
 446                      && (++i_index < BUFFER_SIZE - 4) )
 447             {
 448                 i_header = U32_AT(p_buffer + i_index);
 449             }
 450
 451             if( (i_header & 0xFFFFFF00) != 0x100L )
 452             {
 453                 intf_WarnMsg( 3, "vcd warning: no packet at sector %d\n",
 454                                  p_vcd->i_sector - 1 );
 455                 break; /* go to the next sector */
 456             }
 457 #ifdef DEBUG
 458             intf_DbgMsg( "packet start code : %X\n", i_header );
 459 #endif
 460
 461             switch( i_header )
 462             {
 463                 /* 0x1b9 == SYSTEM_END_CODE, it is only 4 bytes long. */
 464                 case 0x1b9:
 465                     i_packet_size = -2;
 466                     break;
 467
 468                 /* Pack header */
 469                 case 0x1ba:
 470                     if( ( *( p_buffer + ( i_index + 4 ) ) & 0xC0) == 0x40 )
 471                     {
 472                         /* MPEG-2 */
 473                         i_packet_size = 8;
 474                     }
 475                     else if( (*(p_buffer + ( i_index + 4 ) ) & 0xF0) == 0x20 )
 476                     {
 477                         /* MPEG-1 */
 478                         i_packet_size = 6;
 479                     }
 480                     else
 481                     {
 482                         intf_ErrMsg( "Unable to determine stream type" );
 483                         return( -1 );
 484                     }
 485                     break;
 486
 487                 /* The packet is at least 6 bytes long. */
 488                 default:
 489                     /* That's the case for all packets, except pack header. */
 490                     i_packet_size = U16_AT((p_buffer + ( i_index + 4 )));
 491                     break;
 492             }
 493
 494             intf_DbgMsg("i_index : %d\n", i_index);
 495             intf_DbgMsg("i_packet_size : %d\n", i_packet_size);
 496
 497             if ( i_index + i_packet_size > BUFFER_SIZE )
 498             {
 499                 intf_ErrMsg( "vcd error: packet too long (%i)",
 500                              i_index + i_packet_size );
 501                 continue;
 502             }
 503
 504             /* Fetch a packet of the appropriate size. */
 505             p_data = p_input->pf_new_packet( p_input->p_method_data,
 506                                              i_packet_size + 6 );
 507
 508             if( p_data == NULL )
 509             {
 510                 intf_ErrMsg( "vcd error: out of memory" );
 511                 return( -1 );
 512             }
 513
 514             if( U32_AT(p_buffer) != 0x1B9 )
 515             {
 516                 p_main->fast_memcpy( p_data->p_demux_start, p_buffer + i_index,
 517                                      6 + i_packet_size );
 518                 i_index += ( 6 + i_packet_size );
 519             }
 520             else
 521             {
 522                 /* Copy the small header. */
 523                 memcpy( p_data->p_demux_start, p_buffer + i_index, 4 );
 524                 i_index += 4;
 525             }
 526
 527             /* Give the packet to the other input stages. */
 528             *pp_data = p_data;
 529             pp_data = &p_data->p_next;
 530
 531             i_packet++;
 532         }
 533     }
 534
 535     vlc_mutex_lock( &p_input->stream.stream_lock );
 536
 537     p_input->stream.p_selected_area->i_tell =
 538         p_vcd->i_sector - p_input->stream.p_selected_area->i_start;
 539
 540     /* no chapter for the moment*/
 541     /*if( b_eoc )
 542     {
 543         * We modify i_part only at end of chapter not to erase
 544          * some modification from the interface *
 545         p_input->stream.p_selected_area->i_part = p_vcd->i_chapter;
 546     }*/
 547
 548     if( p_vcd->b_end_of_track )
 549     {
 550         input_area_t *p_area;
 551
 552         /* EOF ? */
 553         if( p_vcd->i_track >= p_vcd->nb_tracks - 1 )
 554         {
 555             vlc_mutex_unlock( &p_input->stream.stream_lock );
 556             return 0;
 557         }
 558
 559         intf_WarnMsg( 4, "vcd info: new title" );
 560
 561         p_vcd->b_end_of_track = 0;
 562
 563         p_area = p_input->stream.pp_areas[
 564                                  p_input->stream.p_selected_area->i_id + 1 ];
 565
 566         p_area->i_part = 1;
 567         VCDSetArea( p_input, p_area );
 568     }
 569
 570     vlc_mutex_unlock( &p_input->stream.stream_lock );
 571
 572     return( i_packet + 1 );
 573 }
 574
 575 /*****************************************************************************
 576  * VCDRewind : reads a stream backward
 577  *****************************************************************************/
 578 static int VCDRewind( input_thread_t * p_input )
 579 {
 580     return( -1 );
 581 }
 582
 583 /****************************************************************************
 584  * VCDSeek
 585  ****************************************************************************/
 586 static void VCDSeek( input_thread_t * p_input, off_t i_off )
 587 {
 588     thread_vcd_data_t *               p_vcd;
 589
 590     p_vcd = (thread_vcd_data_t *) p_input->p_plugin_data;
 591
 592     p_vcd->i_sector = p_vcd->p_sectors[p_vcd->i_track] + i_off;
 593
 594     p_input->stream.p_selected_area->i_tell = p_vcd->i_sector
 595         - p_input->stream.p_selected_area->i_start;
 596 }
 597