subtitles.c
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上传日期:2009-03-27
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- /*****************************************************************************
- * subtitles.c
- *****************************************************************************
- * Copyright (C) 2003-2004 VideoLAN
- * $Id: subtitles.c 8947 2004-10-07 20:52:24Z hartman $
- *
- * 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 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.
- *****************************************************************************/
- /**
- * file
- * This file contains functions to dectect subtitle files.
- */
- #include <stdlib.h>
- #include <vlc/vlc.h>
- #include <vlc/input.h>
- #ifdef HAVE_DIRENT_H
- # include <dirent.h>
- #else
- # include "../extras/dirent.h"
- #endif
- #include <ctype.h>
- /**
- * What's between a directory and a filename?
- */
- #if defined( WIN32 )
- #define DIRECTORY_SEPARATOR '\'
- #else
- #define DIRECTORY_SEPARATOR '/'
- #endif
- /**
- * We are not going to autodetect more subtitle files than this.
- */
- #define MAX_SUBTITLE_FILES 128
- /**
- * The possible extentions for subtitle files we support
- */
- static const char * sub_exts[] = { "utf", "utf8", "utf-8", "sub", "srt", "smi", "txt", "ssa", "idx", NULL};
- /* extensions from unsupported types */
- /* rt, aqt, jss, js, ass */
- static void strcpy_trim( char *d, char *s )
- {
- /* skip leading whitespace */
- while( *s && !isalnum(*s) )
- {
- s++;
- }
- for(;;)
- {
- /* copy word */
- while( *s && isalnum(*s) )
- {
- *d = tolower(*s);
- s++; d++;
- }
- if (*s == 0) break;
- /* trim excess whitespace */
- while( *s && !isalnum(*s) )
- {
- s++;
- }
- if( *s == 0 ) break;
- *d++ = ' ';
- }
- *d = 0;
- }
- static void strcpy_strip_ext( char *d, char *s )
- {
- char *tmp = strrchr(s, '.');
- if( !tmp ) {
- strcpy(d, s);
- return;
- }
- else
- {
- strncpy(d, s, tmp - s);
- d[tmp - s] = 0;
- }
- while( *d )
- {
- *d = tolower(*d);
- d++;
- }
- }
- static void strcpy_get_ext( char *d, char *s )
- {
- char *tmp = strrchr(s, '.');
- if( !tmp )
- {
- strcpy(d, "");
- return;
- } else strcpy( d, tmp + 1 );
- }
- static int whiteonly( char *s )
- {
- while ( *s )
- {
- if( isalnum( *s ) ) return 0;
- s++;
- }
- return 1;
- }
- typedef struct _subfn
- {
- int priority;
- char *psz_fname;
- char *psz_ext;
- } subfn;
- static int compare_sub_priority( const void *a, const void *b )
- {
- if (((subfn*)a)->priority > ((subfn*)b)->priority)
- {
- return -1;
- }
- if (((subfn*)a)->priority < ((subfn*)b)->priority)
- {
- return 1;
- }
- #ifndef UNDER_CE
- return strcoll(((subfn*)a)->psz_fname, ((subfn*)b)->psz_fname);
- #else
- return strcmp(((subfn*)a)->psz_fname, ((subfn*)b)->psz_fname);
- #endif
- }
- /**
- * Convert a list of paths separated by ',' to a char**
- */
- static char **paths_to_list( char *psz_dir, char *psz_path )
- {
- unsigned int i, k, i_nb_subdirs;
- char **subdirs; /* list of subdirectories to look in */
-
- i_nb_subdirs = 1;
- for( k = 0; k < strlen( psz_path ); k++ )
- {
- if( psz_path[k] == ',' )
- {
- i_nb_subdirs++;
- }
- }
-
- if( i_nb_subdirs > 0 )
- {
- char *psz_parser, *psz_temp;
-
- subdirs = (char**)malloc( sizeof(char*) * ( i_nb_subdirs + 1 ) );
- memset( subdirs, 0, sizeof(char*) * ( i_nb_subdirs + 1 ) );
- i = 0;
- psz_parser = psz_path;
- while( psz_parser && *psz_parser )
- {
- char *psz_subdir;
- psz_subdir = psz_parser;
- psz_parser = strchr( psz_subdir, ',' );
- if( psz_parser )
- {
- *psz_parser = ' ';
- psz_parser++;
- while( *psz_parser == ' ' )
- {
- psz_parser++;
- }
- }
- if( strlen( psz_subdir ) > 0 )
- {
- psz_temp = (char *)malloc( strlen(psz_dir)
- + strlen(psz_subdir) + 2 );
- if( psz_temp )
- {
- sprintf( psz_temp, "%s%s%c",
- psz_subdir[0] == '.' ? psz_dir : "",
- psz_subdir,
- psz_subdir[strlen(psz_subdir) - 1] ==
- DIRECTORY_SEPARATOR ? ' ' : DIRECTORY_SEPARATOR );
- subdirs[i] = psz_temp;
- i++;
- }
- }
- }
- subdirs[i] = NULL;
- }
- else
- {
- subdirs = NULL;
- }
- return subdirs;
- }
- /**
- * Detect subtitle files.
- *
- * When called this function will split up the psz_fname 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_fname the complete filename to base the search on.
- * return a NULL terminated array of filenames with detected possible subtitles.
- * The array contains max MAX_SUBTITLE_FILES items and you need to free it after use.
- */
- char **subtitles_Detect( input_thread_t *p_this, char *psz_path,
- char *psz_fname )
- {
- /* variables to be used for derivatives of psz_fname */
- char *f_dir, *f_fname, *f_fname_noext, *f_fname_trim, *tmp;
- /* variables to be used for derivatives FILE *f */
- char *tmp_fname_noext, *tmp_fname_trim, *tmp_fname_ext, *tmpresult;
- vlc_value_t fuzzy;
- int len, i, j, i_sub_count, i_result2;
- subfn *result; /* unsorted results */
- char **result2; /* sorted results */
- char **tmp_subdirs, **subdirs; /* list of subdirectories to look in */
- FILE *f;
- DIR *d;
- struct dirent *de;
- if( !strncmp( psz_fname, "file://", 7 ) )
- {
- psz_fname += 7;
- }
- i_sub_count = 0;
- len = strlen( psz_fname ) > 256 ? strlen( psz_fname ) : 256;
- f_dir = (char*)malloc(len);
- f_fname = (char*)malloc(len);
- f_fname_noext = (char*)malloc(len);
- f_fname_trim = (char*)malloc(len);
- tmp_fname_noext = (char*)malloc(len);
- tmp_fname_trim = (char*)malloc(len);
- tmp_fname_ext = (char*)malloc(len);
- tmpresult = (char*)malloc(len);
- result = (subfn*)malloc( sizeof(subfn) * MAX_SUBTITLE_FILES );
- memset( result, 0, sizeof(subfn) * MAX_SUBTITLE_FILES );
- /* extract filename & dirname from psz_fname */
- tmp = strrchr( psz_fname, DIRECTORY_SEPARATOR );
- if( tmp )
- {
- int pos;
- strncpy( f_fname, tmp + 1, len - 1 );
- f_fname[len - 1] = 0;
- pos = tmp - psz_fname + 1;
- strncpy( f_dir, psz_fname, __MIN(pos,len-1) );
- f_dir[__MIN(pos,len-1)] = 0;
- }
- else
- {
- strncpy( f_fname, psz_fname, len - 1 );
- f_fname[len - 1] = 0;
- strcpy( f_dir, "" );
- }
- strcpy_strip_ext( f_fname_noext, f_fname );
- strcpy_trim( f_fname_trim, f_fname_noext );
- var_Get( p_this, "sub-autodetect-fuzzy", &fuzzy );
- tmp_subdirs = paths_to_list( f_dir, psz_path );
- subdirs = tmp_subdirs;
- for( j = -1; j == -1 || ( j >= 0 && subdirs != NULL && *subdirs != NULL );
- j++)
- {
- d = opendir( j < 0 ? f_dir : *subdirs );
- if( d )
- {
- int b_found;
- msg_Dbg( p_this, "looking for a subtitle file in %s",
- j < 0 ? f_dir : *subdirs );
- while( ( de = readdir( d ) ) )
- {
- /* retrieve various parts of the filename */
- strcpy_strip_ext( tmp_fname_noext, de->d_name );
- strcpy_get_ext( tmp_fname_ext, de->d_name );
- strcpy_trim( tmp_fname_trim, tmp_fname_noext );
- /* does it end with a subtitle extension? */
- b_found = 0;
- for( i = 0; sub_exts[i]; i++ )
- {
- if( strcmp( sub_exts[i], tmp_fname_ext ) == 0 )
- {
- b_found = 1;
- msg_Dbg( p_this, "found a possible subtitle: %s",
- de->d_name );
- break;
- }
- }
- /* we have a (likely) subtitle file */
- if( b_found )
- {
- int i_prio = 0;
- if( !i_prio && !strcmp( tmp_fname_trim, f_fname_trim ) )
- {
- /* matches the movie name exactly */
- i_prio = 4;
- }
- if( !i_prio &&
- ( 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 = 2;
- }
- else
- {
- /* chars after (and possibly in front of)
- * the movie name */
- i_prio = 3;
- }
- }
- if( !i_prio )
- {
- /* doesn't contain the movie name */
- if( j == 0 ) i_prio = 1;
- }
- if( i_prio >= fuzzy.i_int )
- {
- sprintf( tmpresult, "%s%s", j == -1 ? f_dir : *subdirs,
- de->d_name );
- msg_Dbg( p_this, "autodetected subtitle: %s with "
- "priority %d", de->d_name, i_prio );
- if( ( f = fopen( tmpresult, "rt" ) ) )
- {
- fclose( f );
- result[i_sub_count].priority = i_prio;
- result[i_sub_count].psz_fname = strdup(tmpresult);
- result[i_sub_count].psz_ext = strdup(tmp_fname_ext);
- i_sub_count++;
- }
- }
- }
- if( i_sub_count >= MAX_SUBTITLE_FILES ) break;
- }
- closedir( d );
- }
- if( j >= 0 ) free( *subdirs++ );
- }
- if( tmp_subdirs ) free( tmp_subdirs );
- free( f_dir );
- free( f_fname );
- free( f_fname_noext );
- free( f_fname_trim );
- free( tmp_fname_noext );
- free( tmp_fname_trim );
- free( tmp_fname_ext );
- free( tmpresult );
- qsort( result, i_sub_count, sizeof( subfn ), compare_sub_priority );
- result2 = (char**)malloc( sizeof(char*) * ( i_sub_count + 1 ) );
- memset( result2, 0, sizeof(char*) * ( i_sub_count + 1 ) );
- i_result2 = 0;
- for( i = 0; i < i_sub_count; i++ )
- {
- if( result[i].psz_ext && !strcasecmp( result[i].psz_ext, "sub" ) )
- {
- int j;
- for( j = 0; j < i_sub_count; j++ )
- {
- if( result[j].psz_fname && result[i].psz_fname &&
- !strncasecmp( result[i].psz_fname, result[j].psz_fname, sizeof( result[i].psz_fname) - 4 ) &&
- !strcasecmp( result[j].psz_ext, "idx" ) )
- break;
-
- }
- if( j >= i_sub_count )
- {
- result2[i_result2] = result[i].psz_fname;
- i_result2++;
- }
- }
- else
- {
- result2[i_result2] = result[i].psz_fname;
- i_result2++;
- }
- }
- free( result );
- return result2;
- }