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vlc/src/input/subtitles.c

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/*****************************************************************************
* subtitles.c : subtitles detection
*****************************************************************************
* Copyright (C) 2003-2009 VLC authors and VideoLAN
*
* Authors: Derk-Jan Hartman <hartman at videolan.org>
* This is adapted code from the GPL'ed MPlayer (http://mplayerhq.hu)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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.
*****************************************************************************/
/**
* \file
* This file contains functions to detect subtitle files.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <ctype.h> /* isalnum() */
#include <unistd.h>
#include <sys/stat.h>
#include <vlc_common.h>
#include <vlc_arrays.h>
#include <vlc_fs.h>
#include <vlc_url.h>
#include "input_internal.h"
/**
* The possible extensions for subtitle files we support
*/
static const char *const sub_exts[] = { SLAVE_SPU_EXTENSIONS, "" };
/**
* Remove file extension in-place
*/
static void filename_strip_ext_inplace(char *str)
{
char *tmp = strrchr(str, '.');
if (tmp)
*tmp = '\0';
}
/**
* Trim special characters from a filename
*
* Trims whitespaces and other non-alphanumeric
* characters from filenames.
*
* \warning This function operates on the passed string
* without copying. It might return a pointer different to
* the passed one, in case it trims characters at the beginning.
* Therefore it is essential that the return value is used where
* the trimmed version of the string is needed and the returned
* pointer must not be free()d but rather the original pointer!
*/
VLC_USED static char *filename_trim_inplace(char *str)
{
char *ret = str;
unsigned char c;
// Trim leading non-alnum
while( (c = *str) != '\0' && !isalnum(c) )
str++;
ret = str;
// Trim inline nonalnum groups
char *writehead = str;
bool consecutive = false;
while( (c = *str) != '\0' )
{
if ( !isalnum(c) )
{
if ( consecutive )
{
str++;
continue;
}
c = ' ';
consecutive = true;
} else {
consecutive = false;
}
*writehead++ = tolower(c);
str++;
}
*writehead = '\0';
// Remove trailing space, if any
if ( consecutive )
*(writehead - 1) = '\0';
return ret;
}
static int whiteonly( const char *s )
{
unsigned char c;
while( (c = *s) != '\0' )
{
if( isalnum( c ) )
return 0;
s++;
}
return 1;
}
static int slave_strcmp( const void *a, const void *b )
{
const input_item_slave_t *p_slave0 = *((const input_item_slave_t **) a);
const input_item_slave_t *p_slave1 = *((const input_item_slave_t **) b);
if( p_slave0 == NULL || p_slave1 == NULL )
return 0;
/* We can compare these uris since they come from the file system */
#ifdef HAVE_STRCOLL
return strcoll( p_slave0->psz_uri, p_slave1->psz_uri );
#else
return strcmp( p_slave0->psz_uri, p_slave1->psz_uri );
#endif
}
/*
* Check if a file ends with a subtitle extension
*/
int subtitles_Filter( const char *psz_dir_content )
{
const char *tmp = strrchr( psz_dir_content, '.');
if( !tmp )
return 0;
tmp++;
for( int i = 0; sub_exts[i][0]; i++ )
if( strcasecmp( sub_exts[i], tmp ) == 0 )
return 1;
return 0;
}
/**
* Convert a list of paths separated by ',' to a char**
*/
static char **paths_to_list( const char *psz_dir, char *psz_path )
{
unsigned int i, k, i_nb_subdirs;
char **subdirs; /* list of subdirectories to look in */
char *psz_parser = psz_path;
if( !psz_dir || !psz_path )
return NULL;
for( k = 0, i_nb_subdirs = 1; psz_path[k] != '\0'; k++ )
{
if( psz_path[k] == ',' )
i_nb_subdirs++;
}
subdirs = calloc( i_nb_subdirs + 1, sizeof(char*) );
if( !subdirs )
return NULL;
for( i = 0; psz_parser && *psz_parser != '\0' ; )
{
char *psz_subdir = psz_parser;
psz_parser = strchr( psz_subdir, ',' );
if( psz_parser )
{
*psz_parser++ = '\0';
while( *psz_parser == ' ' )
psz_parser++;
}
if( asprintf( &subdirs[i], "%s%s",
psz_subdir[0] == '.' ? psz_dir : "",
psz_subdir ) == -1 )
break;
i++;
}
subdirs[i] = NULL;
return subdirs;
}
/**
* Detect subtitle files.
*
* When called this function will split up the psz_name string into a
* directory, filename and extension. It then opens the directory
* in which the file resides and tries to find possible matches of
* subtitles files.
*
* \ingroup Demux
* \param p_this the calling \ref input_thread_t
* \param psz_path a list of subdirectories (separated by a ',') to look in.
* \param psz_name_org the complete filename to base the search on.
* \param ppp_slaves an initialized input item slave list to append detected subtitles to
* \param p_slaves pointer to the size of the slave list
* \return VLC_SUCCESS if ok
*/
int subtitles_Detect( input_thread_t *p_this, char *psz_path, const char *psz_name_org,
input_item_slave_t ***ppp_slaves, int *p_slaves )
{
int i_fuzzy = var_GetInteger( p_this, "sub-autodetect-fuzzy" );
if ( i_fuzzy == 0 )
return VLC_EGENERIC;
input_item_slave_t **pp_slaves = *ppp_slaves;
int i_slaves = *p_slaves;
char **subdirs; /* list of subdirectories to look in */
if( !psz_name_org )
return VLC_EGENERIC;
char *psz_fname_ext = vlc_uri2path( psz_name_org );
if( !psz_fname_ext )
return VLC_EGENERIC;
char *psz_fname = strdup( psz_fname_ext );
char *f_dir = strdup( psz_fname_ext );
if( psz_fname == NULL || f_dir == NULL )
{
free( psz_fname_ext );
free( psz_fname );
free( f_dir );
return VLC_ENOMEM;
}
/* extract filename & dirname from psz_fname */
char *f_fname_trim = strrchr( psz_fname, DIR_SEP_CHAR );
if( !f_fname_trim )
{
free( f_dir );
free( psz_fname_ext );
free( psz_fname );
return VLC_EGENERIC;
}
f_fname_trim++; /* Skip the '/' */
f_dir[f_fname_trim - psz_fname] = 0; /* keep dir separator in f_dir */
filename_strip_ext_inplace(f_fname_trim);
f_fname_trim = filename_trim_inplace(f_fname_trim);
subdirs = paths_to_list( f_dir, psz_path );
for( int j = -1; (j == -1) || ( j >= 0 && subdirs != NULL && subdirs[j] != NULL ); j++ )
{
const char *psz_dir = (j < 0) ? f_dir : subdirs[j];
if( psz_dir == NULL || ( j >= 0 && !strcmp( psz_dir, f_dir ) ) )
continue;
/* parse psz_src dir */
vlc_DIR *dir = vlc_opendir( psz_dir );
if( dir == NULL )
continue;
msg_Dbg( p_this, "looking for a subtitle file in %s", psz_dir );
const char *psz_name;
while( (psz_name = vlc_readdir( dir )) )
{
if( psz_name[0] == '.' || !subtitles_Filter( psz_name ) )
continue;
char *tmp_fname = strdup(psz_name);
if (!tmp_fname)
break;
const char *tmp;
int i_prio = 0;
/* retrieve various parts of the filename */
filename_strip_ext_inplace(tmp_fname);
char *tmp_fname_trim = filename_trim_inplace(tmp_fname);
if( !strcmp( tmp_fname_trim, f_fname_trim ) )
{
/* matches the movie name exactly */
i_prio = SLAVE_PRIORITY_MATCH_ALL;
}
else if( (tmp = strstr( tmp_fname_trim, f_fname_trim )) )
{
/* contains the movie name */
tmp += strlen( f_fname_trim );
if( whiteonly( tmp ) )
{
/* chars in front of the movie name */
i_prio = SLAVE_PRIORITY_MATCH_RIGHT;
}
else
{
/* chars after (and possibly in front of)
* the movie name */
i_prio = SLAVE_PRIORITY_MATCH_LEFT;
}
}
else if( j == -1 )
{
/* doesn't contain the movie name, prefer files in f_dir over subdirs */
i_prio = SLAVE_PRIORITY_MATCH_NONE;
}
free(tmp_fname);
tmp_fname_trim = NULL;
if( i_prio >= i_fuzzy )
{
struct stat st;
char *path;
size_t i_len = strlen( psz_dir );
const char *psz_format;
if ( i_len == 0 )
continue;
if( psz_dir[i_len - 1] == DIR_SEP_CHAR )
psz_format = "%s%s";
else
psz_format = "%s"DIR_SEP"%s";
if( asprintf( &path, psz_format, psz_dir, psz_name ) < 0 )
continue;
if( strcmp( path, psz_fname_ext )
&& vlc_stat( path, &st ) == 0
&& S_ISREG( st.st_mode ) )
{
msg_Dbg( p_this,
"autodetected subtitle: %s with priority %d",
path, i_prio );
char *psz_uri = vlc_path2uri( path, NULL );
input_item_slave_t *p_sub = psz_uri != NULL ?
input_item_slave_New( psz_uri, SLAVE_TYPE_SPU, i_prio )
: NULL;
if( p_sub )
{
p_sub->b_forced = true;
TAB_APPEND(i_slaves, pp_slaves, p_sub);
}
free( psz_uri );
}
free( path );
}
}
vlc_closedir( dir );
}
if( subdirs )
{
for( size_t j = 0; subdirs[j] != NULL; j++ )
free( subdirs[j] );
free( subdirs );
}
free( f_dir );
free( psz_fname );
free( psz_fname_ext );
for( int i = 0; i < i_slaves; i++ )
{
input_item_slave_t *p_sub = pp_slaves[i];
bool b_reject = false;
char *psz_ext = strrchr( p_sub->psz_uri, '.' );
if( !psz_ext )
continue;
psz_ext++;
if( !strcasecmp( psz_ext, "sub" ) )
{
for( int j = 0; j < i_slaves; j++ )
{
input_item_slave_t *p_sub_inner = pp_slaves[j];
/* A slave can be null if it's already rejected */
if( p_sub_inner == NULL )
continue;
/* check that the filenames without extension match */
if( strncasecmp( p_sub->psz_uri, p_sub_inner->psz_uri,
strlen( p_sub->psz_uri ) - 3 ) )
continue;
char *psz_ext_inner = strrchr( p_sub_inner->psz_uri, '.' );
if( !psz_ext_inner )
continue;
psz_ext_inner++;
/* check that we have an idx file */
if( !strcasecmp( psz_ext_inner, "idx" ) )
{
b_reject = true;
break;
}
}
}
else if( !strcasecmp( psz_ext, "cdg" ) )
{
if( p_sub->i_priority < SLAVE_PRIORITY_MATCH_ALL )
b_reject = true;
}
if( b_reject )
{
pp_slaves[i] = NULL;
input_item_slave_Delete( p_sub );
}
}
/* Sort alphabetically */
if( i_slaves > 0 )
qsort( pp_slaves, i_slaves, sizeof (input_item_slave_t*), slave_strcmp );
*ppp_slaves = pp_slaves; /* in case of realloc */
*p_slaves = i_slaves;
return VLC_SUCCESS;
}
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