1 /*****************************************************************************
2 * vcd.c : VCD input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2000 VideoLAN
5 * $Id: vcd.c,v 1.11 2002/11/13 20:23:21 fenrir Exp $
7 * Author: Johan Bilien <jobi@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
31 #include <vlc/input.h>
33 #include "../../demux/mpeg/system.h"
43 /* how many blocks VCDRead will read in each loop */
44 #define VCD_BLOCKS_ONCE 20
45 #define VCD_DATA_ONCE (VCD_BLOCKS_ONCE * VCD_DATA_SIZE)
47 /*****************************************************************************
48 * thread_vcd_data_t: VCD information
49 *****************************************************************************/
50 typedef struct thread_vcd_data_s
52 vcddev_t *vcddev; /* vcd device descriptor */
53 int i_nb_tracks; /* Nb of tracks (titles) */
54 int i_track; /* Current track */
55 int i_sector; /* Current Sector */
56 int * p_sectors; /* Track sectors */
57 int i_entries_nb; /* Number of entry points */
58 int * p_entries; /* Entry points */
59 vlc_bool_t b_valid_ep; /* Valid entry points flag */
60 vlc_bool_t b_end_of_track; /* If the end of track was reached */
64 /*****************************************************************************
66 *****************************************************************************/
67 static int VCDOpen ( vlc_object_t * );
68 static void VCDClose ( vlc_object_t * );
69 static int VCDRead ( input_thread_t *, byte_t *, size_t );
70 static void VCDSeek ( input_thread_t *, off_t );
71 static int VCDSetArea ( input_thread_t *, input_area_t * );
72 static int VCDSetProgram ( input_thread_t *, pgrm_descriptor_t * );
73 static int VCDEntryPoints ( input_thread_t * );
75 /*****************************************************************************
77 *****************************************************************************/
79 set_description( _("VCD input module") );
80 set_capability( "access", 80 );
81 set_callbacks( VCDOpen, VCDClose );
82 add_shortcut( "svcd" );
86 * Data reading functions
89 /*****************************************************************************
91 *****************************************************************************/
92 static int VCDOpen( vlc_object_t *p_this )
94 input_thread_t * p_input = (input_thread_t *)p_this;
99 thread_vcd_data_t * p_vcd;
101 input_area_t * p_area;
105 p_input->pf_read = VCDRead;
106 p_input->pf_seek = VCDSeek;
107 p_input->pf_set_area = VCDSetArea;
108 p_input->pf_set_program = VCDSetProgram;
111 /* On Win32 we want the VCD access plugin to be explicitly requested,
112 * we end up with lots of problems otherwise */
113 if( !p_input->psz_access || !*p_input->psz_access ) return( -1 );
116 /* parse the options passed in command line : */
117 psz_orig = psz_parser = psz_source = strdup( p_input->psz_name );
124 while( *psz_parser && *psz_parser != '@' )
129 if( *psz_parser == '@' )
135 i_title = (int)strtol( psz_parser, &psz_next, 10 );
138 psz_parser = psz_next + 1;
139 i_chapter = (int)strtol( psz_parser, &psz_next, 10 );
142 i_title = i_title ? i_title : 1;
143 i_chapter = i_chapter ? i_chapter : 1;
148 if( !p_input->psz_access )
153 psz_source = config_GetPsz( p_input, "vcd" );
154 if( !psz_source ) return -1;
157 p_vcd = malloc( sizeof(thread_vcd_data_t) );
161 msg_Err( p_input, "out of memory" );
166 p_input->p_access_data = (void *)p_vcd;
168 p_input->i_mtu = VCD_DATA_ONCE;
170 vlc_mutex_lock( &p_input->stream.stream_lock );
172 p_input->stream.b_pace_control = 1;
174 p_input->stream.b_seekable = 1;
175 p_input->stream.p_selected_area->i_size = 0;
176 p_input->stream.p_selected_area->i_tell = 0;
178 vlc_mutex_unlock( &p_input->stream.stream_lock );
180 if( !(p_vcd->vcddev = ioctl_Open( p_this, psz_source )) )
182 msg_Warn( p_input, "could not open %s", psz_source );
188 /* We read the Table Of Content information */
189 p_vcd->i_nb_tracks = ioctl_GetTracksMap( VLC_OBJECT(p_input),
190 p_vcd->vcddev, &p_vcd->p_sectors );
192 if( p_vcd->i_nb_tracks < 0 )
193 msg_Err( p_input, "unable to count tracks" );
194 else if( p_vcd->i_nb_tracks <= 1 )
195 msg_Err( p_input, "no movie tracks found" );
196 if( p_vcd->i_nb_tracks <= 1)
198 ioctl_Close( p_this, p_vcd->vcddev );
203 /* Allocate the entry points table */
204 p_vcd->p_entries = malloc( p_vcd->i_nb_tracks * sizeof( int ) );
206 if( p_vcd->p_entries == NULL )
208 msg_Err( p_input, "not enough memory" );
209 ioctl_Close( p_this, p_vcd->vcddev );
213 /* Set stream and area data */
214 vlc_mutex_lock( &p_input->stream.stream_lock );
216 /* Initialize ES structures */
217 input_InitStream( p_input, sizeof( stream_ps_data_t ) );
219 /* disc input method */
220 p_input->stream.i_method = INPUT_METHOD_VCD;
222 p_input->stream.i_area_nb = 1;
224 #define area p_input->stream.pp_areas
225 for( i = 1 ; i <= p_vcd->i_nb_tracks - 1 ; i++ )
227 input_AddArea( p_input );
229 /* Titles are Program Chains */
232 /* Absolute start offset and size */
233 area[i]->i_start = (off_t)p_vcd->p_sectors[i] * (off_t)VCD_DATA_SIZE;
234 area[i]->i_size = (off_t)(p_vcd->p_sectors[i+1] - p_vcd->p_sectors[i])
235 * (off_t)VCD_DATA_SIZE;
237 /* Number of chapters */
238 area[i]->i_part_nb = 0; /* will be the entry points */
241 /* i_plugin_data is used to store which entry point is the first
242 * of the track (area) */
243 area[i]->i_plugin_data = 0;
247 p_area = p_input->stream.pp_areas[i_title];
249 p_vcd->b_valid_ep = 1;
250 if( VCDEntryPoints( p_input ) < 0 )
252 msg_Warn( p_input, "could read entry points, will not use them" );
253 p_vcd->b_valid_ep = 0;
256 VCDSetArea( p_input, p_area );
258 vlc_mutex_unlock( &p_input->stream.stream_lock );
260 if( !p_input->psz_demux || !*p_input->psz_demux )
262 p_input->psz_demux = "ps";
268 /*****************************************************************************
269 * VCDClose: closes vcd
270 *****************************************************************************/
271 static void VCDClose( vlc_object_t *p_this )
273 input_thread_t * p_input = (input_thread_t *)p_this;
274 thread_vcd_data_t *p_vcd = (thread_vcd_data_t *)p_input->p_access_data;
276 ioctl_Close( p_this, p_vcd->vcddev );
280 /*****************************************************************************
281 * VCDRead: reads from the VCD into PES packets.
282 *****************************************************************************
283 * Returns -1 in case of error, 0 in case of EOF, otherwise the number of
285 *****************************************************************************/
286 static int VCDRead( input_thread_t * p_input, byte_t * p_buffer,
289 thread_vcd_data_t * p_vcd;
293 byte_t p_last_sector[ VCD_DATA_SIZE ];
295 p_vcd = (thread_vcd_data_t *)p_input->p_access_data;
299 /* Compute the number of blocks we have to read */
301 i_blocks = i_len / VCD_DATA_SIZE;
303 for ( i_index = 0 ; i_index < i_blocks ; i_index++ )
305 if ( ioctl_ReadSector( VLC_OBJECT(p_input), p_vcd->vcddev,
306 p_vcd->i_sector, p_buffer + i_index * VCD_DATA_SIZE ) < 0 )
308 msg_Err( p_input, "could not read sector %d", p_vcd->i_sector );
313 if ( p_vcd->i_sector == p_vcd->p_sectors[p_vcd->i_track + 1] )
315 input_area_t *p_area;
317 if ( p_vcd->i_track >= p_vcd->i_nb_tracks - 1 )
320 vlc_mutex_lock( &p_input->stream.stream_lock );
321 p_area = p_input->stream.pp_areas[
322 p_input->stream.p_selected_area->i_id + 1 ];
324 msg_Dbg( p_input, "new title" );
327 VCDSetArea( p_input, p_area );
328 vlc_mutex_unlock( &p_input->stream.stream_lock );
332 else if( p_vcd->b_valid_ep &&
333 /* FIXME kludge so that read does not update chapter
334 * when a manual chapter change was requested and not
335 * yet accomplished */
336 !p_input->stream.p_new_area )
340 vlc_mutex_lock( &p_input->stream.stream_lock );
341 i_entry = p_input->stream.p_selected_area->i_plugin_data
342 /* 1st entry point of the track (area)*/
343 + p_input->stream.p_selected_area->i_part - 1;
344 if( i_entry + 1 < p_vcd->i_entries_nb &&
345 p_vcd->i_sector >= p_vcd->p_entries[i_entry + 1] )
347 msg_Dbg( p_input, "new chapter" );
348 p_input->stream.p_selected_area->i_part ++;
350 vlc_mutex_unlock( &p_input->stream.stream_lock );
353 i_read += VCD_DATA_SIZE;
356 if ( i_len % VCD_DATA_SIZE ) /* this should not happen */
358 if ( ioctl_ReadSector( VLC_OBJECT(p_input), p_vcd->vcddev,
359 p_vcd->i_sector, p_last_sector ) < 0 )
361 msg_Err( p_input, "could not read sector %d", p_vcd->i_sector );
365 p_input->p_vlc->pf_memcpy( p_buffer + i_blocks * VCD_DATA_SIZE,
366 p_last_sector, i_len % VCD_DATA_SIZE );
367 i_read += i_len % VCD_DATA_SIZE;
374 /*****************************************************************************
375 * VCDSetProgram: Does nothing since a VCD is mono_program
376 *****************************************************************************/
377 static int VCDSetProgram( input_thread_t * p_input,
378 pgrm_descriptor_t * p_program)
384 /*****************************************************************************
385 * VCDSetArea: initialize input data for title x, chapter y.
386 * It should be called for each user navigation request.
387 ****************************************************************************/
388 static int VCDSetArea( input_thread_t * p_input, input_area_t * p_area )
390 thread_vcd_data_t * p_vcd;
392 p_vcd = (thread_vcd_data_t*)p_input->p_access_data;
394 /* we can't use the interface slider until initilization is complete */
395 p_input->stream.b_seekable = 0;
397 if( p_area != p_input->stream.p_selected_area )
399 /* Reset the Chapter position of the current title */
400 p_input->stream.p_selected_area->i_part = 1;
401 p_input->stream.p_selected_area->i_tell = 0;
403 /* Change the default area */
404 p_input->stream.p_selected_area = p_area;
406 /* Change the current track */
407 /* The first track is not a valid one */
408 p_vcd->i_track = p_area->i_id;
409 p_vcd->i_sector = p_vcd->p_sectors[p_vcd->i_track];
412 if( p_vcd->b_valid_ep )
414 int i_entry = p_area->i_plugin_data /* 1st entry point of
416 + p_area->i_part - 1;
417 p_vcd->i_sector = p_vcd->p_entries[i_entry];
420 p_vcd->i_sector = p_vcd->p_sectors[p_vcd->i_track];
422 p_input->stream.p_selected_area->i_tell =
423 (off_t)p_vcd->i_sector * (off_t)VCD_DATA_SIZE
424 - p_input->stream.p_selected_area->i_start;
426 /* warn interface that something has changed */
427 p_input->stream.b_seekable = 1;
428 p_input->stream.b_changed = 1;
434 /****************************************************************************
436 ****************************************************************************/
437 static void VCDSeek( input_thread_t * p_input, off_t i_off )
439 thread_vcd_data_t * p_vcd;
442 p_vcd = (thread_vcd_data_t *) p_input->p_access_data;
444 p_vcd->i_sector = p_vcd->p_sectors[p_vcd->i_track]
445 + i_off / (off_t)VCD_DATA_SIZE;
447 vlc_mutex_lock( &p_input->stream.stream_lock );
448 #define p_area p_input->stream.p_selected_area
450 if( p_vcd->b_valid_ep )
452 for( i_index = 0 ; i_index < p_area->i_part_nb - 1 ; i_index ++ )
454 if( p_vcd->i_sector < p_vcd->p_entries[p_area->i_plugin_data
457 p_area->i_part = i_index;
464 p_input->stream.p_selected_area->i_tell =
465 (off_t)p_vcd->i_sector * (off_t)VCD_DATA_SIZE
466 - p_input->stream.p_selected_area->i_start;
467 vlc_mutex_unlock( &p_input->stream.stream_lock );
470 /*****************************************************************************
471 * VCDEntryPoints: Reads the information about the entry points on the disc.
472 *****************************************************************************/
473 static int VCDEntryPoints( input_thread_t * p_input )
475 thread_vcd_data_t * p_vcd;
477 entries_sect_t entries;
479 int i, i_entry_index = 0;
480 int i_previous_track = -1;
482 p_vcd = (thread_vcd_data_t *) p_input->p_access_data;
484 p_sector = malloc( VCD_DATA_SIZE * sizeof( byte_t ) );
485 if( p_sector == NULL )
487 msg_Err( p_input, "not enough memory for entry points treatment" );
491 if( ioctl_ReadSector( VLC_OBJECT(p_input), p_vcd->vcddev,
492 VCD_ENTRIES_SECTOR, p_sector ) < 0 )
494 msg_Err( p_input, "could not read entry points sector" );
499 memcpy( &entries, p_sector, CD_SECTOR_SIZE );
502 if( (i_nb = U16_AT( &entries.i_entries_nb )) > 500 )
504 msg_Err( p_input, "invalid entry points number" );
508 p_vcd->p_entries = malloc( sizeof( int ) * i_nb );
509 if( p_vcd->p_entries == NULL )
511 msg_Err( p_input, "not enough memory for entry points treatment" );
515 if( strncmp( entries.psz_id, "ENTRYVCD", sizeof( entries.psz_id ) )
516 && strncmp( entries.psz_id, "ENTRYSVD", sizeof( entries.psz_id ) ))
518 msg_Err( p_input, "unrecognized entry points format" );
519 free( p_vcd->p_entries );
523 p_vcd->i_entries_nb = 0;
525 #define i_track entries.entry[i].i_track
526 for( i = 0 ; i < i_nb ; i++ )
528 if( i_track <= p_input->stream.i_area_nb )
530 p_vcd->p_entries[i_entry_index] =
531 (MSF_TO_LBA2( BCD_TO_BIN( entries.entry[i].msf.minute ),
532 BCD_TO_BIN( entries.entry[i].msf.second ),
533 BCD_TO_BIN( entries.entry[i].msf.frame ) ));
534 p_input->stream.pp_areas[i_track-1]->i_part_nb ++;
535 /* if this entry belongs to a new track */
536 if( i_track != i_previous_track )
538 /* i_plugin_data is used to store the first entry of the area*/
539 p_input->stream.pp_areas[i_track-1]->i_plugin_data =
541 i_previous_track = i_track;
544 p_vcd->i_entries_nb ++;
547 msg_Warn( p_input, "wrong track number found in entry points" );