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vlc/modules/access/file.c

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/*****************************************************************************
* file.c: file input (file: access plug-in)
*****************************************************************************
* Copyright (C) 2001-2004 the VideoLAN team
* $Id$
*
* Authors: Christophe Massiot <massiot@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., 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
#include "charset.h"
/*****************************************************************************
* 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 *, const 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 = strdup( p_access->psz_path );
char *psz;
#ifdef HAVE_SYS_STAT_H
struct stat stat_info;
#endif
vlc_bool_t b_stdin;
file_entry_t * p_file;
b_stdin = psz_name[0] == '-' && psz_name[1] == '\0';
if( !b_stdin )
{
if( psz_name[0] == '~' && psz_name[1] == '/' )
{
psz = malloc( strlen(p_access->p_vlc->psz_homedir)
+ strlen(psz_name) );
/* This is incomplete : we should also support the ~cmassiot/
* syntax. */
sprintf( psz, "%s/%s", p_access->p_vlc->psz_homedir, psz_name + 2 );
free( psz_name );
psz_name = psz;
}
#if defined(WIN32)
else if( !strcasecmp( p_access->psz_access, "file" )
&& ('/' == psz_name[0]) && psz_name[1]
&& (':' == psz_name[2]) && ('/' == psz_name[3]) )
{
/*
** explorer can open path such as file:/C:/ or file:///C:/...
** hence remove leading / if found
*/
++psz_name;
}
#endif
#ifdef HAVE_SYS_STAT_H
psz = ToLocale( psz_name );
if( stat( psz, &stat_info ) )
{
msg_Warn( p_access, "%s: %s", psz_name, strerror( errno ) );
LocaleFree( psz );
free( psz_name );
return VLC_EGENERIC;
}
LocaleFree( psz );
#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 );
free( psz_name );
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 );
free( psz_name );
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 = 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;
TAB_APPEND( p_sys->i_file, p_sys->file, p_file );
}
psz_name = psz_parser;
if( psz_name ) psz_name++;
}
}
free( psz );
return VLC_SUCCESS;
}
/*****************************************************************************
* Close: close the target
*****************************************************************************/
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;
int i;
close( p_sys->fd );
for( i = 0; i < p_sys->i_file; i++ )
{
free( p_sys->file[i]->psz_name );
free( p_sys->file[i] );
}
free( p_sys->file );
free( p_sys );
}
/*****************************************************************************
* Read: standard read on a file descriptor.
*****************************************************************************/
static int Read( access_t *p_access, uint8_t *p_buffer, int i_len )
{
access_sys_t *p_sys = p_access->p_sys;
int i_ret;
#if !defined(WIN32) && !defined(UNDER_CE)
if( !p_sys->b_pace_control )
{
if( !p_sys->b_kfir )
{
/* Find if some data is available. This won't work under Windows. */
struct timeval timeout;
fd_set fds;
/* Initialize file descriptor set */
FD_ZERO( &fds );
FD_SET( p_sys->fd, &fds );
/* We'll wait 0.5 second if nothing happens */
timeout.tv_sec = 0;
timeout.tv_usec = 500000;
/* Find if some data is available */
while( (i_ret = select( p_sys->fd + 1, &fds, NULL, NULL, &timeout )) == 0
|| (i_ret < 0 && errno == EINTR) )
{
FD_ZERO( &fds );
FD_SET( p_sys->fd, &fds );
timeout.tv_sec = 0;
timeout.tv_usec = 500000;
if( p_access->b_die )
return 0;
}
if( i_ret < 0 )
{
msg_Err( p_access, "select error (%s)", strerror(errno) );
return -1;
}
i_ret = read( p_sys->fd, p_buffer, i_len );
}
else
{
/* b_kfir ; work around a buggy poll() driver implementation */
while ( (i_ret = read( p_sys->fd, p_buffer, i_len )) == 0 &&
!p_access->b_die )
{
msleep( INPUT_ERROR_SLEEP );
}
}
}
else
#endif /* WIN32 || UNDER_CE */
{
/* b_pace_control || WIN32 */
i_ret = read( p_sys->fd, p_buffer, i_len );
}
if( i_ret < 0 )
{
if( errno != EINTR && errno != EAGAIN )
msg_Err( p_access, "read failed (%s)", strerror(errno) );
/* Delay a bit to avoid consuming all the CPU. This is particularly
* useful when reading from an unconnected FIFO. */
msleep( INPUT_ERROR_SLEEP );
}
p_sys->i_nb_reads++;
#ifdef HAVE_SYS_STAT_H
if( p_access->info.i_size != 0 &&
(p_sys->i_nb_reads % INPUT_FSTAT_NB_READS) == 0 )
{
struct stat stat_info;
int i_file = p_sys->i_index;
if ( fstat( p_sys->fd, &stat_info ) == -1 )
{
msg_Warn( p_access, "couldn't stat again the file (%s)", strerror(errno) );
}
else if ( p_sys->file[i_file]->i_size != stat_info.st_size )
{
p_access->info.i_size += (stat_info.st_size - p_sys->file[i_file]->i_size );
p_sys->file[i_file]->i_size = stat_info.st_size;
p_access->info.i_update |= INPUT_UPDATE_SIZE;
}
}
#endif
/* If we reached an EOF then switch to the next file in the list */
if ( i_ret == 0 && p_sys->i_index + 1 < p_sys->i_file )
{
char *psz_name = p_sys->file[++p_sys->i_index]->psz_name;
p_sys->fd_backup = p_sys->fd;
msg_Dbg( p_access, "opening file `%s'", psz_name );
if ( _OpenFile( p_access, psz_name ) )
{
p_sys->fd = p_sys->fd_backup;
return 0;
}
close( p_sys->fd_backup );
/* We have to read some data */
return Read( p_access, p_buffer, i_len );
}
if( i_ret > 0 )
p_access->info.i_pos += i_ret;
else if( i_ret == 0 )
p_access->info.b_eof = VLC_TRUE;
return i_ret;
}
/*****************************************************************************
* Seek: seek to a specific location in a file
*****************************************************************************/
static int Seek( access_t *p_access, int64_t i_pos )
{
access_sys_t *p_sys = p_access->p_sys;
int64_t i_size = 0;
/* Check which file we need to access */
if( p_sys->i_file > 1 )
{
int i;
char *psz_name;
p_sys->fd_backup = p_sys->fd;
for( i = 0; i < p_sys->i_file - 1; i++ )
{
if( i_pos < p_sys->file[i]->i_size + i_size )
break;
i_size += p_sys->file[i]->i_size;
}
psz_name = p_sys->file[i]->psz_name;
msg_Dbg( p_access, "opening file `%s'", psz_name );
if ( i != p_sys->i_index && !_OpenFile( p_access, psz_name ) )
{
/* Close old file */
close( p_sys->fd_backup );
p_sys->i_index = i;
}
else
{
p_sys->fd = p_sys->fd_backup;
}
}
lseek( p_sys->fd, i_pos - i_size, SEEK_SET );
p_access->info.i_pos = i_pos;
if( p_access->info.i_size < p_access->info.i_pos )
{
msg_Err( p_access, "seeking too far" );
p_access->info.i_pos = p_access->info.i_size;
}
else if( p_access->info.i_pos < 0 )
{
msg_Err( p_access, "seeking too early" );
p_access->info.i_pos = 0;
}
/* Reset eof */
p_access->info.b_eof = VLC_FALSE;
/* FIXME */
return VLC_SUCCESS;
}
/*****************************************************************************
* Control:
*****************************************************************************/
static int Control( access_t *p_access, int i_query, va_list args )
{
access_sys_t *p_sys = p_access->p_sys;
vlc_bool_t *pb_bool;
int *pi_int;
int64_t *pi_64;
switch( i_query )
{
/* */
case ACCESS_CAN_SEEK:
case ACCESS_CAN_FASTSEEK:
pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
*pb_bool = p_sys->b_seekable;
break;
case ACCESS_CAN_PAUSE:
case ACCESS_CAN_CONTROL_PACE:
pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
*pb_bool = p_sys->b_pace_control;
break;
/* */
case ACCESS_GET_MTU:
pi_int = (int*)va_arg( args, int * );
*pi_int = 0;
break;
case ACCESS_GET_PTS_DELAY:
pi_64 = (int64_t*)va_arg( args, int64_t * );
*pi_64 = var_GetInteger( p_access, "file-caching" ) * I64C(1000);
break;
/* */
case ACCESS_SET_PAUSE_STATE:
/* Nothing to do */
break;
case ACCESS_GET_TITLE_INFO:
case ACCESS_SET_TITLE:
case ACCESS_SET_SEEKPOINT:
case ACCESS_SET_PRIVATE_ID_STATE:
case ACCESS_GET_META:
return VLC_EGENERIC;
default:
msg_Warn( p_access, "unimplemented query in control" );
return VLC_EGENERIC;
}
return VLC_SUCCESS;
}
/*****************************************************************************
* OpenFile: Opens a specific file
*****************************************************************************/
static int _OpenFile( access_t * p_access, const char * psz_name )
{
access_sys_t *p_sys = p_access->p_sys;
const char *psz_localname;
psz_localname = ToLocale( psz_name );
#ifdef UNDER_CE
p_sys->fd = fopen( psz_localname, "rb" );
LocaleFree( psz_localname );
if ( !p_sys->fd )
{
msg_Err( p_access, "cannot open file %s", psz_name );
return VLC_EGENERIC;
}
fseek( p_sys->fd, 0, SEEK_END );
p_access->info.i_size = ftell( p_sys->fd );
p_access->info.i_update |= INPUT_UPDATE_SIZE;
fseek( p_sys->fd, 0, SEEK_SET );
#else
p_sys->fd = open( psz_localname, O_NONBLOCK /*| O_LARGEFILE*/ );
LocaleFree( psz_localname );
if ( p_sys->fd == -1 )
{
msg_Err( p_access, "cannot open file %s (%s)", psz_name,
strerror(errno) );
return VLC_EGENERIC;
}
#endif
return VLC_SUCCESS;
}