vcd.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:16k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * vcd.c : VCD input module for vlc
- *****************************************************************************
- * Copyright (C) 2000-2004 the VideoLAN team
- * $Id: 96e400c3c01983b075ac5b855e4b704146d20e0f $
- *
- * Author: Johan Bilien <jobi@via.ecp.fr>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_plugin.h>
- #include <vlc_input.h>
- #include <vlc_access.h>
- #include <vlc_charset.h>
- #include "cdrom.h"
- /*****************************************************************************
- * Module descriptior
- *****************************************************************************/
- static int Open ( vlc_object_t * );
- static void Close( vlc_object_t * );
- #define CACHING_TEXT N_("Caching value in ms")
- #define CACHING_LONGTEXT N_(
- "Caching value for VCDs. This "
- "value should be set in milliseconds." )
- vlc_module_begin ()
- set_shortname( N_("VCD"))
- set_description( N_("VCD input") )
- set_capability( "access", 60 )
- set_callbacks( Open, Close )
- set_category( CAT_INPUT )
- set_subcategory( SUBCAT_INPUT_ACCESS )
- add_usage_hint( N_("[vcd:][device][@[title][,[chapter]]]") )
- add_integer( "vcd-caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT,
- CACHING_LONGTEXT, true )
- add_shortcut( "vcd" )
- add_shortcut( "svcd" )
- vlc_module_end ()
- /*****************************************************************************
- * Local prototypes
- *****************************************************************************/
- /* how many blocks VCDRead will read in each loop */
- #define VCD_BLOCKS_ONCE 20
- #define VCD_DATA_ONCE (VCD_BLOCKS_ONCE * VCD_DATA_SIZE)
- struct access_sys_t
- {
- vcddev_t *vcddev; /* vcd device descriptor */
- /* Title infos */
- int i_titles;
- input_title_t *title[99]; /* No more that 99 track in a vcd ? */
- int i_sector; /* Current Sector */
- int *p_sectors; /* Track sectors */
- };
- static block_t *Block( access_t * );
- static int Seek( access_t *, int64_t );
- static int Control( access_t *, int, va_list );
- static int EntryPoints( access_t * );
- /*****************************************************************************
- * VCDOpen: open vcd
- *****************************************************************************/
- static int Open( vlc_object_t *p_this )
- {
- access_t *p_access = (access_t *)p_this;
- access_sys_t *p_sys;
- char *psz_dup = ToLocaleDup( p_access->psz_path );
- char *psz;
- int i_title = 0;
- int i_chapter = 0;
- int i;
- vcddev_t *vcddev;
- /* Command line: vcd://[dev_path][@title[,chapter]] */
- if( ( psz = strchr( psz_dup, '@' ) ) )
- {
- *psz++ = ' ';
- i_title = strtol( psz, &psz, 0 );
- if( *psz )
- i_chapter = strtol( psz+1, &psz, 0 );
- }
- if( *psz_dup == ' ' )
- {
- free( psz_dup );
- /* Only when selected */
- if( strcmp( p_access->psz_access, "vcd" ) &&
- strcmp( p_access->psz_access, "svcd" ) )
- return VLC_EGENERIC;
- psz_dup = var_CreateGetString( p_access, "vcd" );
- if( *psz_dup == ' ' )
- {
- free( psz_dup );
- return VLC_EGENERIC;
- }
- }
- #ifdef WIN32
- if( psz_dup[0] && psz_dup[1] == ':' &&
- psz_dup[2] == '\' && psz_dup[3] == ' ' ) psz_dup[2] = ' ';
- #endif
- /* Open VCD */
- if( !(vcddev = ioctl_Open( p_this, psz_dup )) )
- {
- free( psz_dup );
- return VLC_EGENERIC;
- }
- free( psz_dup );
- /* Set up p_access */
- p_access->pf_read = NULL;
- p_access->pf_block = Block;
- p_access->pf_control = Control;
- p_access->pf_seek = Seek;
- p_access->info.i_update = 0;
- p_access->info.i_size = 0;
- p_access->info.i_pos = 0;
- p_access->info.b_eof = false;
- p_access->info.i_title = 0;
- p_access->info.i_seekpoint = 0;
- p_access->p_sys = p_sys = calloc( 1, sizeof( access_sys_t ) );
- if( !p_sys )
- goto error;
- p_sys->vcddev = vcddev;
- /* We read the Table Of Content information */
- p_sys->i_titles = ioctl_GetTracksMap( VLC_OBJECT(p_access),
- p_sys->vcddev, &p_sys->p_sectors );
- if( p_sys->i_titles < 0 )
- {
- msg_Err( p_access, "unable to count tracks" );
- goto error;
- }
- else if( p_sys->i_titles <= 1 )
- {
- msg_Err( p_access, "no movie tracks found" );
- goto error;
- }
- /* The first title isn't usable */
- p_sys->i_titles--;
- /* Build title table */
- for( i = 0; i < p_sys->i_titles; i++ )
- {
- input_title_t *t = p_sys->title[i] = vlc_input_title_New();
- msg_Dbg( p_access, "title[%d] start=%d", i, p_sys->p_sectors[1+i] );
- msg_Dbg( p_access, "title[%d] end=%d", i, p_sys->p_sectors[i+2] );
- t->i_size = ( p_sys->p_sectors[i+2] - p_sys->p_sectors[i+1] ) *
- (int64_t)VCD_DATA_SIZE;
- }
- /* Map entry points into chapters */
- if( EntryPoints( p_access ) )
- {
- msg_Warn( p_access, "could not read entry points, will not use them" );
- }
- /* Starting title/chapter and sector */
- if( i_title >= p_sys->i_titles )
- i_title = 0;
- if( i_chapter >= p_sys->title[i_title]->i_seekpoint )
- i_chapter = 0;
- p_sys->i_sector = p_sys->p_sectors[1+i_title];
- if( i_chapter > 0 )
- {
- p_sys->i_sector +=
- ( p_sys->title[i_title]->seekpoint[i_chapter]->i_byte_offset /
- VCD_DATA_SIZE );
- }
- p_access->info.i_title = i_title;
- p_access->info.i_seekpoint = i_chapter;
- p_access->info.i_size = p_sys->title[i_title]->i_size;
- p_access->info.i_pos = ( p_sys->i_sector - p_sys->p_sectors[1+i_title] ) *
- VCD_DATA_SIZE;
- free( p_access->psz_demux );
- p_access->psz_demux = strdup( "ps" );
- return VLC_SUCCESS;
- error:
- ioctl_Close( VLC_OBJECT(p_access), p_sys->vcddev );
- free( p_sys );
- return VLC_EGENERIC;
- }
- /*****************************************************************************
- * Close: closes vcd
- *****************************************************************************/
- static void Close( vlc_object_t *p_this )
- {
- access_t *p_access = (access_t *)p_this;
- access_sys_t *p_sys = p_access->p_sys;
- ioctl_Close( p_this, p_sys->vcddev );
- free( p_sys );
- }
- /*****************************************************************************
- * Control:
- *****************************************************************************/
- static int Control( access_t *p_access, int i_query, va_list args )
- {
- access_sys_t *p_sys = p_access->p_sys;
- bool *pb_bool;
- int *pi_int;
- int64_t *pi_64;
- input_title_t ***ppp_title;
- int i;
- switch( i_query )
- {
- /* */
- case ACCESS_CAN_SEEK:
- case ACCESS_CAN_FASTSEEK:
- case ACCESS_CAN_PAUSE:
- case ACCESS_CAN_CONTROL_PACE:
- pb_bool = (bool*)va_arg( args, bool* );
- *pb_bool = true;
- break;
- /* */
- case ACCESS_GET_PTS_DELAY:
- pi_64 = (int64_t*)va_arg( args, int64_t * );
- *pi_64 = var_GetInteger( p_access, "vcd-caching" ) * 1000;
- break;
- /* */
- case ACCESS_SET_PAUSE_STATE:
- break;
- case ACCESS_GET_TITLE_INFO:
- ppp_title = (input_title_t***)va_arg( args, input_title_t*** );
- pi_int = (int*)va_arg( args, int* );
- /* Duplicate title infos */
- *pi_int = p_sys->i_titles;
- *ppp_title = malloc( sizeof(input_title_t **) * p_sys->i_titles );
- for( i = 0; i < p_sys->i_titles; i++ )
- {
- (*ppp_title)[i] = vlc_input_title_Duplicate( p_sys->title[i] );
- }
- break;
- case ACCESS_SET_TITLE:
- i = (int)va_arg( args, int );
- if( i != p_access->info.i_title )
- {
- /* Update info */
- p_access->info.i_update |=
- INPUT_UPDATE_TITLE|INPUT_UPDATE_SEEKPOINT|INPUT_UPDATE_SIZE;
- p_access->info.i_title = i;
- p_access->info.i_seekpoint = 0;
- p_access->info.i_size = p_sys->title[i]->i_size;
- p_access->info.i_pos = 0;
- /* Next sector to read */
- p_sys->i_sector = p_sys->p_sectors[1+i];
- }
- break;
- case ACCESS_SET_SEEKPOINT:
- {
- input_title_t *t = p_sys->title[p_access->info.i_title];
- i = (int)va_arg( args, int );
- if( t->i_seekpoint > 0 )
- {
- p_access->info.i_update |= INPUT_UPDATE_SEEKPOINT;
- p_access->info.i_seekpoint = i;
- p_sys->i_sector = p_sys->p_sectors[1+p_access->info.i_title] +
- t->seekpoint[i]->i_byte_offset / VCD_DATA_SIZE;
- p_access->info.i_pos = (int64_t)(p_sys->i_sector -
- p_sys->p_sectors[1+p_access->info.i_title]) *VCD_DATA_SIZE;
- }
- return VLC_SUCCESS;
- }
- case ACCESS_SET_PRIVATE_ID_STATE:
- case ACCESS_GET_CONTENT_TYPE:
- return VLC_EGENERIC;
- default:
- msg_Warn( p_access, "unimplemented query in control" );
- return VLC_EGENERIC;
- }
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * Block:
- *****************************************************************************/
- static block_t *Block( access_t *p_access )
- {
- access_sys_t *p_sys = p_access->p_sys;
- int i_blocks = VCD_BLOCKS_ONCE;
- block_t *p_block;
- int i_read;
- /* Check end of file */
- if( p_access->info.b_eof ) return NULL;
- /* Check end of title */
- while( p_sys->i_sector >= p_sys->p_sectors[p_access->info.i_title + 2] )
- {
- if( p_access->info.i_title + 2 >= p_sys->i_titles )
- {
- p_access->info.b_eof = true;
- return NULL;
- }
- p_access->info.i_update |=
- INPUT_UPDATE_TITLE | INPUT_UPDATE_SEEKPOINT | INPUT_UPDATE_SIZE;
- p_access->info.i_title++;
- p_access->info.i_seekpoint = 0;
- p_access->info.i_size =
- p_sys->title[p_access->info.i_title]->i_size;
- p_access->info.i_pos = 0;
- }
- /* Don't read after the end of a title */
- if( p_sys->i_sector + i_blocks >=
- p_sys->p_sectors[p_access->info.i_title + 2] )
- {
- i_blocks = p_sys->p_sectors[p_access->info.i_title + 2 ] -
- p_sys->i_sector;
- }
- /* Do the actual reading */
- if( !( p_block = block_New( p_access, i_blocks * VCD_DATA_SIZE ) ) )
- {
- msg_Err( p_access, "cannot get a new block of size: %i",
- i_blocks * VCD_DATA_SIZE );
- return NULL;
- }
- if( ioctl_ReadSectors( VLC_OBJECT(p_access), p_sys->vcddev,
- p_sys->i_sector, p_block->p_buffer, i_blocks, VCD_TYPE ) < 0 )
- {
- msg_Err( p_access, "cannot read sector %i", p_sys->i_sector );
- block_Release( p_block );
- /* Try to skip one sector (in case of bad sectors) */
- p_sys->i_sector++;
- p_access->info.i_pos += VCD_DATA_SIZE;
- return NULL;
- }
- /* Update seekpoints */
- for( i_read = 0; i_read < i_blocks; i_read++ )
- {
- input_title_t *t = p_sys->title[p_access->info.i_title];
- if( t->i_seekpoint > 0 &&
- p_access->info.i_seekpoint + 1 < t->i_seekpoint &&
- p_access->info.i_pos + i_read * VCD_DATA_SIZE >=
- t->seekpoint[p_access->info.i_seekpoint+1]->i_byte_offset )
- {
- msg_Dbg( p_access, "seekpoint change" );
- p_access->info.i_update |= INPUT_UPDATE_SEEKPOINT;
- p_access->info.i_seekpoint++;
- }
- }
- /* Update a few values */
- p_sys->i_sector += i_blocks;
- p_access->info.i_pos += p_block->i_buffer;
- return p_block;
- }
- /*****************************************************************************
- * Seek:
- *****************************************************************************/
- static int Seek( access_t *p_access, int64_t i_pos )
- {
- access_sys_t *p_sys = p_access->p_sys;
- input_title_t *t = p_sys->title[p_access->info.i_title];
- int i_seekpoint;
- /* Next sector to read */
- p_access->info.i_pos = i_pos;
- p_sys->i_sector = i_pos / VCD_DATA_SIZE +
- p_sys->p_sectors[p_access->info.i_title + 1];
- /* Update current seekpoint */
- for( i_seekpoint = 0; i_seekpoint < t->i_seekpoint; i_seekpoint++ )
- {
- if( i_seekpoint + 1 >= t->i_seekpoint ) break;
- if( i_pos < t->seekpoint[i_seekpoint + 1]->i_byte_offset ) break;
- }
- if( i_seekpoint != p_access->info.i_seekpoint )
- {
- msg_Dbg( p_access, "seekpoint change" );
- p_access->info.i_update |= INPUT_UPDATE_SEEKPOINT;
- p_access->info.i_seekpoint = i_seekpoint;
- }
- /* Reset eof */
- p_access->info.b_eof = false;
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * EntryPoints: Reads the information about the entry points on the disc.
- *****************************************************************************/
- static int EntryPoints( access_t *p_access )
- {
- access_sys_t *p_sys = p_access->p_sys;
- uint8_t sector[VCD_DATA_SIZE];
- entries_sect_t entries;
- int i_nb, i;
- /* Read the entry point sector */
- if( ioctl_ReadSectors( VLC_OBJECT(p_access), p_sys->vcddev,
- VCD_ENTRIES_SECTOR, sector, 1, VCD_TYPE ) < 0 )
- {
- msg_Err( p_access, "could not read entry points sector" );
- return VLC_EGENERIC;
- }
- memcpy( &entries, sector, CD_SECTOR_SIZE );
- i_nb = GetWBE( &entries.i_entries_nb );
- if( i_nb > 500 )
- {
- msg_Err( p_access, "invalid entry points number" );
- return VLC_EGENERIC;
- }
- if( strncmp( entries.psz_id, "ENTRYVCD", sizeof( entries.psz_id ) ) &&
- strncmp( entries.psz_id, "ENTRYSVD", sizeof( entries.psz_id ) ) )
- {
- msg_Err( p_access, "unrecognized entry points format" );
- return VLC_EGENERIC;
- }
- for( i = 0; i < i_nb; i++ )
- {
- const int i_title = BCD_TO_BIN(entries.entry[i].i_track) - 2;
- const int i_sector =
- (MSF_TO_LBA2( BCD_TO_BIN( entries.entry[i].msf.minute ),
- BCD_TO_BIN( entries.entry[i].msf.second ),
- BCD_TO_BIN( entries.entry[i].msf.frame ) ));
- seekpoint_t *s;
- if( i_title < 0 ) continue; /* Should not occur */
- if( i_title >= p_sys->i_titles ) continue;
- msg_Dbg( p_access, "Entry[%d] title=%d sector=%d",
- i, i_title, i_sector );
- s = vlc_seekpoint_New();
- s->i_byte_offset = (i_sector - p_sys->p_sectors[i_title+1]) *
- VCD_DATA_SIZE;
- TAB_APPEND( p_sys->title[i_title]->i_seekpoint,
- p_sys->title[i_title]->seekpoint, s );
- }
- return VLC_SUCCESS;
- }