apps/tagcache.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 by Miika Pekkarinen
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #ifdef HAVE_TAGCACHE
  22 #ifndef _TAGCACHE_H
  23 #define _TAGCACHE_H
  24
  25 #include "metadata.h"
  26
  27 /**
  28  Note: When adding new tags, make sure to update index_entry_ec in
  29  tagcache.c and bump up the header version too.
  30  */
  31 enum tag_type { tag_artist = 0, tag_album, tag_genre, tag_title,
  32     tag_filename, tag_composer, tag_comment, tag_albumartist, tag_grouping, tag_year,
  33     tag_discnumber, tag_tracknumber, tag_bitrate, tag_length, tag_playcount, tag_rating,
  34     tag_playtime, tag_lastplayed, tag_commitid, tag_mtime,
  35     /* Real tags end here, count them. */
  36     TAG_COUNT,
  37     /* Virtual tags */
  38     tag_virt_length_min, tag_virt_length_sec,
  39     tag_virt_playtime_min, tag_virt_playtime_sec,
  40     tag_virt_entryage, tag_virt_autoscore };
  41
  42 /* Maximum length of a single tag. */
  43 #define TAG_MAXLEN (MAX_PATH*2)
  44
  45 /* Allow a little drift to the filename ordering (should not be too high/low). */
  46 #define POS_HISTORY_COUNT 4
  47
  48 /* How much to pre-load entries while committing to prevent seeking. */
  49 #define IDX_BUF_DEPTH 64
  50
  51 /* Tag Cache Header version 'TCHxx'. Increment when changing internal structures. */
  52 #define TAGCACHE_MAGIC  0x5443480c
  53
  54 /* How much to allocate extra space for ramcache. */
  55 #define TAGCACHE_RESERVE 32768
  56
  57 /**
  58  * Define how long one entry must be at least (longer -> less memory at commit).
  59  * Must be at least 4 bytes in length for correct alignment.
  60  */
  61 #define TAGFILE_ENTRY_CHUNK_LENGTH   8
  62
  63 /* Used to guess the necessary buffer size at commit. */
  64 #define TAGFILE_ENTRY_AVG_LENGTH   16
  65
  66 /* How many entries to fetch to the seek table at once while searching. */
  67 #define SEEK_LIST_SIZE 32
  68
  69 /* Always strict align entries for best performance and binary compatibility. */
  70 #define TAGCACHE_STRICT_ALIGN 1
  71
  72 /* Max events in the internal tagcache command queue. */
  73 #define TAGCACHE_COMMAND_QUEUE_LENGTH 32
  74 /* Idle time before committing events in the command queue. */
  75 #define TAGCACHE_COMMAND_QUEUE_COMMIT_DELAY  HZ*2
  76
  77 #define TAGCACHE_MAX_FILTERS 4
  78 #define TAGCACHE_MAX_CLAUSES 32
  79
  80 /* Tag database files. */
  81
  82 /* Temporary database containing new tags to be committed to the main db. */
  83 #define TAGCACHE_FILE_TEMP       ROCKBOX_DIR "/database_tmp.tcd"
  84
  85 /* The main database master index and numeric data. */
  86 #define TAGCACHE_FILE_MASTER     ROCKBOX_DIR "/database_idx.tcd"
  87
  88 /* The main database string data. */
  89 #define TAGCACHE_FILE_INDEX      ROCKBOX_DIR "/database_%d.tcd"
  90
  91 /* ASCII dumpfile of the DB contents. */
  92 #define TAGCACHE_FILE_CHANGELOG  ROCKBOX_DIR "/database_changelog.txt"
  93
  94 /* Serialized DB. */
  95 #define TAGCACHE_STATEFILE       ROCKBOX_DIR "/database_state.tcd"
  96
  97 /* Flags */
  98 #define FLAG_DELETED     0x0001  /* Entry has been removed from db */
  99 #define FLAG_DIRCACHE    0x0002  /* Filename is a dircache pointer */
 100 #define FLAG_DIRTYNUM    0x0004  /* Numeric data has been modified */
 101 #define FLAG_TRKNUMGEN   0x0008  /* Track number has been generated  */
 102 #define FLAG_RESURRECTED 0x0010  /* Statistics data has been resurrected */
 103 #define FLAG_GET_ATTR(flag)      ((flag >> 16) & 0x0000ffff)
 104 #define FLAG_SET_ATTR(flag,attr) flag = (flag & 0x0000ffff) | (attr << 16)
 105
 106 enum clause { clause_none, clause_is, clause_is_not, clause_gt, clause_gteq,
 107     clause_lt, clause_lteq, clause_contains, clause_not_contains,
 108     clause_begins_with, clause_not_begins_with, clause_ends_with,
 109     clause_not_ends_with, clause_oneof };
 110
 111 struct tagcache_stat {
 112     bool initialized;        /* Is tagcache currently busy? */
 113     bool readyvalid;         /* Has tagcache ready status been ascertained */
 114     bool ready;              /* Is tagcache ready to be used? */
 115     bool ramcache;           /* Is tagcache loaded in ram? */
 116     bool commit_delayed;     /* Has commit been delayed until next reboot? */
 117     bool econ;               /* Is endianess correction enabled? */
 118     int  commit_step;        /* Commit progress */
 119     int  ramcache_allocated; /* Has ram been allocated for ramcache? */
 120     int  ramcache_used;      /* How much ram has been really used */
 121     int  progress;           /* Current progress of disk scan */
 122     int  processed_entries;  /* Scanned disk entries so far */
 123     int  queue_length;       /* Command queue length */
 124     volatile const char
 125         *curentry;           /* Path of the current entry being scanned. */
 126     volatile bool syncscreen;/* Synchronous operation with debug screen? */
 127     // const char *uimessage;   /* Pending error message. Implement soon. */
 128 };
 129
 130 enum source_type {source_constant,
 131                   source_runtime,
 132                   source_current_path /* dont add items after this.
 133                                        it is used as an index
 134                                        into id3_to_search_mapping */
 135                  };
 136
 137 struct tagcache_search_clause
 138 {
 139     int tag;
 140     int type;
 141     bool numeric;
 142     int source;
 143     long numeric_data;
 144     char *str;
 145 };
 146
 147 struct tagcache_search {
 148     /* For internal use only. */
 149     int fd, masterfd;
 150     int idxfd[TAG_COUNT];
 151     long seek_list[SEEK_LIST_SIZE];
 152     long seek_flags[SEEK_LIST_SIZE];
 153     long filter_tag[TAGCACHE_MAX_FILTERS];
 154     long filter_seek[TAGCACHE_MAX_FILTERS];
 155     int filter_count;
 156     struct tagcache_search_clause *clause[TAGCACHE_MAX_CLAUSES];
 157     int clause_count;
 158     int seek_list_count;
 159     int seek_pos;
 160     long position;
 161     int entry_count;
 162     bool valid;
 163     bool initialized;
 164     unsigned long *unique_list;
 165     int unique_list_capacity;
 166     int unique_list_count;
 167
 168     /* Exported variables. */
 169     bool ramsearch;
 170     bool ramresult;
 171     int type;
 172     char *result;
 173     int result_len;
 174     long result_seek;
 175     int idx_id;
 176 };
 177
 178 void tagcache_build(const char *path);
 179
 180 #ifdef __PCTOOL__
 181 void tagcache_reverse_scan(void);
 182 #endif
 183
 184 const char* tagcache_tag_to_str(int tag);
 185
 186 bool tagcache_is_numeric_tag(int type);
 187 bool tagcache_is_unique_tag(int type);
 188 bool tagcache_is_sorted_tag(int type);
 189 bool tagcache_find_index(struct tagcache_search *tcs, const char *filename);
 190 bool tagcache_check_clauses(struct tagcache_search *tcs,
 191                             struct tagcache_search_clause **clause, int count);
 192 bool tagcache_search(struct tagcache_search *tcs, int tag);
 193 void tagcache_search_set_uniqbuf(struct tagcache_search *tcs,
 194                                  void *buffer, long length);
 195 bool tagcache_search_add_filter(struct tagcache_search *tcs,
 196                                 int tag, int seek);
 197 bool tagcache_search_add_clause(struct tagcache_search *tcs,
 198                                 struct tagcache_search_clause *clause);
 199 bool tagcache_get_next(struct tagcache_search *tcs);
 200 bool tagcache_retrieve(struct tagcache_search *tcs, int idxid,
 201                        int tag, char *buf, long size);
 202 void tagcache_search_finish(struct tagcache_search *tcs);
 203 long tagcache_get_numeric(const struct tagcache_search *tcs, int tag);
 204 long tagcache_increase_serial(void);
 205 long tagcache_get_serial(void);
 206 bool tagcache_import_changelog(void);
 207 bool tagcache_create_changelog(struct tagcache_search *tcs);
 208 void tagcache_update_numeric(int idx_id, int tag, long data);
 209 bool tagcache_modify_numeric_entry(struct tagcache_search *tcs,
 210                                    int tag, long data);
 211
 212 struct tagcache_stat* tagcache_get_stat(void);
 213 int tagcache_get_commit_step(void);
 214 bool tagcache_prepare_shutdown(void);
 215 void tagcache_shutdown(void);
 216
 217 void tagcache_screensync_event(void);
 218 void tagcache_screensync_enable(bool state);
 219
 220 #ifdef HAVE_TC_RAMCACHE
 221 bool tagcache_is_ramcache(void);
 222 bool tagcache_fill_tags(struct mp3entry *id3, const char *filename);
 223 void tagcache_unload_ramcache(void);
 224 #endif
 225 void tagcache_init(void);
 226 bool tagcache_is_initialized(void);
 227 bool tagcache_is_usable(void);
 228 void tagcache_start_scan(void);
 229 void tagcache_stop_scan(void);
 230 bool tagcache_update(void);
 231 bool tagcache_rebuild(void);
 232 int tagcache_get_max_commit_step(void);
 233 #endif
 234 #endif