file.c

video linux conference

/*****************************************************************************
 * file.c: file input (file: access plug-in)
 *****************************************************************************
 * Copyright (C) 2001-2004 VideoLAN
 * $Id: file.c 10310 2005-03-11 22:36:40Z anil $
 *
 * Authors: Christophe Massiot <[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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <vlc/vlc.h>
#include <vlc/input.h>

#include <stdlib.h>
#include <string.h>
#include <errno.h>
#ifdef HAVE_SYS_TYPES_H
#   include <sys/types.h>
#endif
#ifdef HAVE_SYS_TIME_H
#   include <sys/time.h>
#endif
#ifdef HAVE_SYS_STAT_H
#   include <sys/stat.h>
#endif
#ifdef HAVE_FCNTL_H
#   include <fcntl.h>
#endif

#ifdef HAVE_UNISTD_H
#   include <unistd.h>
#elif defined( WIN32 ) && !defined( UNDER_CE )
#   include <io.h>
#endif

#if defined( WIN32 ) && !defined( UNDER_CE )
/* stat() support for large files on win32 */
#   define stat _stati64
#   define fstat(a,b) _fstati64(a,b)
#   ifdef lseek
#      undef lseek
#   endif
#   define lseek _lseeki64
#elif defined( UNDER_CE )
#   ifdef read
#      undef read
#   endif
#   define read(a,b,c) fread(b,1,c,a)
#   define close(a) fclose(a)
#   ifdef lseek
#      undef lseek
#   endif
#   define lseek fseek
#endif

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int  Open ( vlc_object_t * );
static void Close( vlc_object_t * );

#define CACHING_TEXT N_("Caching value in ms")
#define CACHING_LONGTEXT N_( \
    "Allows you to modify the default caching value for file streams. This " \
    "value should be set in millisecond units." )
#define CAT_TEXT N_("Concatenate with additional files")
#define CAT_LONGTEXT N_( \
    "Allows you to play split files as if they were part of a unique file. " \
    "Specify a comma-separated list of files." )

vlc_module_begin();
    set_description( _("Standard filesystem file input") );
    set_shortname( _("File") );
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_ACCESS );
    add_integer( "file-caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT, CACHING_LONGTEXT, VLC_TRUE );
    add_string( "file-cat", NULL, NULL, CAT_TEXT, CAT_LONGTEXT, VLC_TRUE );
    set_capability( "access2", 50 );
    add_shortcut( "file" );
    add_shortcut( "stream" );
    add_shortcut( "kfir" );
    set_callbacks( Open, Close );
vlc_module_end();


/*****************************************************************************
 * Exported prototypes
 *****************************************************************************/
static int  Seek( access_t *, int64_t );
static int  Read( access_t *, uint8_t *, int );
static int  Control( access_t *, int, va_list );

static int  _OpenFile( access_t *, char * );

typedef struct
{
    char     *psz_name;
    int64_t  i_size;

} file_entry_t;

struct access_sys_t
{
    unsigned int i_nb_reads;
    vlc_bool_t   b_kfir;

    /* Files list */
    int          i_file;
    file_entry_t **file;

    /* Current file */
    int  i_index;
#ifndef UNDER_CE
    int  fd;
    int  fd_backup;
#else
    FILE *fd;
    FILE *fd_backup;
#endif

    /* */
    vlc_bool_t b_seekable;
    vlc_bool_t b_pace_control;
};

/*****************************************************************************
 * Open: open the file
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    access_t     *p_access = (access_t*)p_this;
    access_sys_t *p_sys;
    char *psz_name = p_access->psz_path;
    char *psz;

#ifdef HAVE_SYS_STAT_H
    int                 i_stat;
    struct stat         stat_info;
#endif
    vlc_bool_t          b_stdin;

    file_entry_t *      p_file;


    b_stdin = psz_name[0] == '-' && psz_name[1] == '\0';

#ifdef HAVE_SYS_STAT_H
    if( !b_stdin && (i_stat = stat( psz_name, &stat_info )) == (-1) )
    {
        msg_Warn( p_access, "cannot stat() file `%s' (%s)",
                  psz_name, strerror(errno));
        return VLC_EGENERIC;
    }
#endif

    p_access->pf_read = Read;
    p_access->pf_block = NULL;
    p_access->pf_seek = Seek;
    p_access->pf_control = Control;
    p_access->info.i_update = 0;
    p_access->info.i_size = 0;
    p_access->info.i_pos = 0;
    p_access->info.b_eof = VLC_FALSE;
    p_access->info.i_title = 0;
    p_access->info.i_seekpoint = 0;
    p_access->p_sys = p_sys = malloc( sizeof( access_sys_t ) );
    p_sys->i_nb_reads = 0;
    p_sys->b_kfir = VLC_FALSE;
    p_sys->file = NULL;
    p_sys->i_file = 0;
    p_sys->i_index = 0;
#ifndef UNDER_CE
    p_sys->fd = -1;
#endif

    if( !strcasecmp( p_access->psz_access, "stream" ) )
    {
        p_sys->b_seekable = VLC_FALSE;
        p_sys->b_pace_control = VLC_FALSE;
    }
    else if( !strcasecmp( p_access->psz_access, "kfir" ) )
    {
        p_sys->b_seekable = VLC_FALSE;
        p_sys->b_pace_control = VLC_FALSE;
        p_sys->b_kfir = VLC_TRUE;
    }
    else
    {
        /* file:%s or %s */
        p_sys->b_pace_control = VLC_TRUE;

        if( b_stdin )
        {
            p_sys->b_seekable = VLC_FALSE;
        }
#ifdef UNDER_CE
        else if( VLC_TRUE )
        {
            /* We'll update i_size after it's been opened */
            p_sys->b_seekable = VLC_TRUE;
        }
#elif defined( HAVE_SYS_STAT_H )
        else if( S_ISREG(stat_info.st_mode) || S_ISCHR(stat_info.st_mode) ||
                 S_ISBLK(stat_info.st_mode) )
        {
            p_sys->b_seekable = VLC_TRUE;
            p_access->info.i_size = stat_info.st_size;
        }
        else if( S_ISFIFO(stat_info.st_mode)
#   if !defined( SYS_BEOS ) && !defined( WIN32 )
                  || S_ISSOCK(stat_info.st_mode)
#   endif
               )
        {
            p_sys->b_seekable = VLC_FALSE;
        }
#endif
        else
        {
            msg_Err( p_access, "unknown file type for `%s'", psz_name );
            return VLC_EGENERIC;
        }
    }

    msg_Dbg( p_access, "opening file `%s'", psz_name );

    if( b_stdin )
    {
        p_sys->fd = 0;
    }
    else if( _OpenFile( p_access, psz_name ) )
    {
        free( p_sys );
        return VLC_EGENERIC;
    }

    if( p_sys->b_seekable && !p_access->info.i_size )
    {
        /* FIXME that's bad because all others access will be probed */
        msg_Err( p_access, "file %s is empty, aborting", psz_name );
        free( p_sys );
        return VLC_EGENERIC;
    }

    /* Update default_pts to a suitable value for file access */
    var_Create( p_access, "file-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );

    /*
     * Get the additional list of files
     */
    p_file = malloc( sizeof(file_entry_t) );
    p_file->i_size = p_access->info.i_size;
    p_file->psz_name = strdup( psz_name );
    TAB_APPEND( p_sys->i_file, p_sys->file, p_file );

    psz = var_CreateGetString( p_access, "file-cat" );
    if( *psz )
    {
        char *psz_parser = psz_name = psz;
        int64_t i_size;

        while( psz_name && *psz_name )
        {
            psz_parser = strchr( psz_name, ',' );
            if( psz_parser ) *psz_parser = 0;

            psz_name = strdup( psz_name );
            if( psz_name )
            {
                msg_Dbg( p_access, "adding file `%s'", psz_name );
                i_size = 0;

#ifdef HAVE_SYS_STAT_H
                if( !stat( psz_name, &stat_info ) )
                {
                    p_access->info.i_size += stat_info.st_size;
                    i_size = stat_info.st_size;
                }
                else
                {
                    msg_Dbg( p_access, "cannot stat() file `%s'", psz_name );
                }
#endif
                p_file = malloc( sizeof(file_entry_t) );
                p_file->i_size = i_size;
                p_file->psz_name = psz_name;