vcd.c

vlc源码

/*****************************************************************************
 * vcd.c : VCD input module for vlc
 *****************************************************************************
 * Copyright (C) 2000-2004 the VideoLAN team
 * $Id$
 *
 * Author: Johan Bilien <[e-mail]>
 *
 * 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++ = '\0';

        i_title = strtol( psz, &psz, 0 );
        if( *psz )
            i_chapter = strtol( psz+1, &psz, 0 );
    }

    if( *psz_dup == '\0' )
    {
        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 == '\0' )
        {
            free( psz_dup );
            return VLC_EGENERIC;
        }
    }

#ifdef WIN32
    if( psz_dup[0] && psz_dup[1] == ':' &&
        psz_dup[2] == '\\' && psz_dup[3] == '\0' ) psz_dup[2] = '\0';
#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 = malloc( sizeof( access_sys_t ) );
    memset( p_sys, 0, sizeof( access_sys_t ) );
    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\n", i, p_sys->p_sectors[1+i] );
        msg_Dbg( p_access, "title[%d] end=%d\n", 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* );