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 "system.h"
  26 #include "metadata.h"
  27
  28 /**
  29  Note: When adding new tags, make sure to update index_entry_ec in
  30  tagcache.c and bump up the header version too.
  31  */
  32 enum tag_type { tag_artist = 0, tag_album, tag_genre, tag_title,
  33     tag_filename, tag_composer, tag_comment, tag_albumartist, tag_grouping, tag_year,
  34     tag_discnumber, tag_tracknumber, tag_bitrate, tag_length, tag_playcount, tag_rating,
  35     tag_playtime, tag_lastplayed, tag_commitid, tag_mtime,
  36     /* Real tags end here, count them. */
  37     TAG_COUNT,
  38     /* Virtual tags */
  39     tag_virt_length_min, tag_virt_length_sec,
  40     tag_virt_playtime_min, tag_virt_playtime_sec,
  41     tag_virt_entryage, tag_virt_autoscore };
  42
  43 /* Maximum length of a single tag. */
  44 #define TAG_MAXLEN (MAX_PATH*2)
  45
  46 /* Allow a little drift to the filename ordering (should not be too high/low). */
  47 #define POS_HISTORY_COUNT 4
  48
  49 /* How much to pre-load entries while committing to prevent seeking. */
  50 #define IDX_BUF_DEPTH 64
  51
  52 /* Tag Cache Header version 'TCHxx'. Increment when changing internal structures. */
  53 #define TAGCACHE_MAGIC  0x5443480d
  54
  55 /* How much to allocate extra space for ramcache. */
  56 #define TAGCACHE_RESERVE 32768
  57
  58 /**
  59  * Define how long one entry must be at least (longer -> less memory at commit).
  60  * Must be at least 4 bytes in length for correct alignment.
  61  */
  62 #define TAGFILE_ENTRY_CHUNK_LENGTH   8
  63
  64 /* Used to guess the necessary buffer size at commit. */
  65 #define TAGFILE_ENTRY_AVG_LENGTH   16
  66
  67 /* How many entries to fetch to the seek table at once while searching. */
  68 #define SEEK_LIST_SIZE 32
  69
  70 /* Always strict align entries for best performance and binary compatibility. */
  71 #define TAGCACHE_STRICT_ALIGN 1
  72
  73 /* Max events in the internal tagcache command queue. */
  74 #define TAGCACHE_COMMAND_QUEUE_LENGTH 32
  75 /* Idle time before committing events in the command queue. */
  76 #define TAGCACHE_COMMAND_QUEUE_COMMIT_DELAY  HZ*2
  77
  78 #define TAGCACHE_MAX_FILTERS 4
  79 #define TAGCACHE_MAX_CLAUSES 32
  80
  81 /* Tag database files. */
  82
  83 /* Temporary database containing new tags to be committed to the main db. */
  84 #define TAGCACHE_FILE_TEMP       ROCKBOX_DIR "/database_tmp.tcd"
  85
  86 /* The main database master index and numeric data. */
  87 #define TAGCACHE_FILE_MASTER     ROCKBOX_DIR "/database_idx.tcd"
  88
  89 /* The main database string data. */
  90 #define TAGCACHE_FILE_INDEX      ROCKBOX_DIR "/database_%d.tcd"
  91
  92 /* ASCII dumpfile of the DB contents. */
  93 #define TAGCACHE_FILE_CHANGELOG  ROCKBOX_DIR "/database_changelog.txt"
  94
  95 /* Serialized DB. */
  96 #define TAGCACHE_STATEFILE       ROCKBOX_DIR "/database_state.tcd"
  97
  98 /* Numeric tags (we can use these tags with conditional clauses). */
  99 #define TAGCACHE_NUMERIC_TAGS ((1LU << tag_year) | (1LU << tag_discnumber) | \
 100     (1LU << tag_tracknumber) | (1LU << tag_length) | (1LU << tag_bitrate) | \
 101     (1LU << tag_playcount) | (1LU << tag_rating) | (1LU << tag_playtime) | \
 102     (1LU << tag_lastplayed) | (1LU << tag_commitid) | (1LU << tag_mtime) | \
 103     (1LU << tag_virt_length_min) | (1LU << tag_virt_length_sec) | \
 104     (1LU << tag_virt_playtime_min) | (1LU << tag_virt_playtime_sec) | \
 105     (1LU << tag_virt_entryage) | (1LU << tag_virt_autoscore))
 106
 107 #define TAGCACHE_IS_NUMERIC(tag) (BIT_N(tag) & TAGCACHE_NUMERIC_TAGS)
 108
 109 /* Flags */
 110 #define FLAG_DELETED     0x0001  /* Entry has been removed from db */
 111 #define FLAG_DIRCACHE    0x0002  /* Filename is a dircache pointer */
 112 #define FLAG_DIRTYNUM    0x0004  /* Numeric data has been modified */
 113 #define FLAG_TRKNUMGEN   0x0008  /* Track number has been generated  */
 114 #define FLAG_RESURRECTED 0x0010  /* Statistics data has been resurrected */
 115 #define FLAG_GET_ATTR(flag)      ((flag >> 16) & 0x0000ffff)
 116 #define FLAG_SET_ATTR(flag,attr) flag = (flag & 0x0000ffff) | (attr << 16)
 117
 118 enum clause { clause_none, clause_is, clause_is_not, clause_gt, clause_gteq,
 119     clause_lt, clause_lteq, clause_contains, clause_not_contains,
 120     clause_begins_with, clause_not_begins_with, clause_ends_with,
 121     clause_not_ends_with, clause_oneof };
 122
 123 struct tagcache_stat {
 124     bool initialized;        /* Is tagcache currently busy? */
 125     bool readyvalid;         /* Has tagcache ready status been ascertained */
 126     bool ready;              /* Is tagcache ready to be used? */
 127     bool ramcache;           /* Is tagcache loaded in ram? */
 128     bool commit_delayed;     /* Has commit been delayed until next reboot? */
 129     bool econ;               /* Is endianess correction enabled? */
 130     int  commit_step;        /* Commit progress */
 131     int  ramcache_allocated; /* Has ram been allocated for ramcache? */
 132     int  ramcache_used;      /* How much ram has been really used */
 133     int  progress;           /* Current progress of disk scan */
 134     int  processed_entries;  /* Scanned disk entries so far */
 135     int  queue_length;       /* Command queue length */
 136     volatile const char
 137         *curentry;           /* Path of the current entry being scanned. */
 138     volatile bool syncscreen;/* Synchronous operation with debug screen? */
 139     // const char *uimessage;   /* Pending error message. Implement soon. */
 140 };
 141
 142 enum source_type {source_constant,
 143                   source_runtime,
 144                   source_current_path /* dont add items after this.
 145                                        it is used as an index
 146                                        into id3_to_search_mapping */
 147                  };
 148
 149 struct tagcache_search_clause
 150 {
 151     int tag;
 152     int type;
 153     bool numeric;
 154     int source;
 155     long numeric_data;
 156     char *str;
 157 };
 158
 159 struct tagcache_search {
 160     /* For internal use only. */
 161     int fd, masterfd;
 162     int idxfd[TAG_COUNT];
 163     long seek_list[SEEK_LIST_SIZE];
 164     long seek_flags[SEEK_LIST_SIZE];
 165     long filter_tag[TAGCACHE_MAX_FILTERS];
 166     long filter_seek[TAGCACHE_MAX_FILTERS];
 167     int filter_count;
 168     struct tagcache_search_clause *clause[TAGCACHE_MAX_CLAUSES];
 169     int clause_count;
 170     int seek_list_count;
 171     int seek_pos;
 172     long position;
 173     int entry_count;
 174     bool valid;
 175     bool initialized;
 176     unsigned long *unique_list;
 177     int unique_list_capacity;
 178     int unique_list_count;
 179
 180     /* Exported variables. */
 181     bool ramsearch;
 182     bool ramresult;
 183     int type;
 184     char *result;
 185     int result_len;
 186     long result_seek;
 187     int idx_id;
 188 };
 189
 190 void tagcache_build(const char *path);
 191
 192 #ifdef __PCTOOL__
 193 void tagcache_reverse_scan(void);
 194 #endif
 195
 196 const char* tagcache_tag_to_str(int tag);
 197
 198 #ifdef CPU_SH
 199 bool tagcache_is_numeric_tag(int type);
 200 #endif
 201 bool tagcache_find_index(struct tagcache_search *tcs, const char *filename);
 202 bool tagcache_check_clauses(struct tagcache_search *tcs,
 203                             struct tagcache_search_clause **clause, int count);
 204 bool tagcache_search(struct tagcache_search *tcs, int tag);
 205 void tagcache_search_set_uniqbuf(struct tagcache_search *tcs,
 206                                  void *buffer, long length);
 207 bool tagcache_search_add_filter(struct tagcache_search *tcs,
 208                                 int tag, int seek);
 209 bool tagcache_search_add_clause(struct tagcache_search *tcs,
 210                                 struct tagcache_search_clause *clause);
 211 bool tagcache_get_next(struct tagcache_search *tcs);
 212 bool tagcache_retrieve(struct tagcache_search *tcs, int idxid,
 213                        int tag, char *buf, long size);
 214 void tagcache_search_finish(struct tagcache_search *tcs);
 215 long tagcache_get_numeric(const struct tagcache_search *tcs, int tag);
 216 long tagcache_increase_serial(void);
 217 long tagcache_get_serial(void);
 218 bool tagcache_import_changelog(void);
 219 bool tagcache_create_changelog(struct tagcache_search *tcs);
 220 void tagcache_update_numeric(int idx_id, int tag, long data);
 221 bool tagcache_modify_numeric_entry(struct tagcache_search *tcs,
 222                                    int tag, long data);
 223
 224 struct tagcache_stat* tagcache_get_stat(void);
 225 int tagcache_get_commit_step(void);
 226 bool tagcache_prepare_shutdown(void);
 227 void tagcache_shutdown(void);
 228
 229 void tagcache_screensync_event(void);
 230 void tagcache_screensync_enable(bool state);
 231
 232 #ifdef HAVE_TC_RAMCACHE
 233 bool tagcache_is_ramcache(void);
 234 bool tagcache_fill_tags(struct mp3entry *id3, const char *filename);
 235 void tagcache_unload_ramcache(void);
 236 #endif
 237 void tagcache_init(void);
 238 bool tagcache_is_initialized(void);
 239 bool tagcache_is_usable(void);
 240 void tagcache_start_scan(void);
 241 void tagcache_stop_scan(void);
 242 bool tagcache_update(void);
 243 bool tagcache_rebuild(void);
 244 int tagcache_get_max_commit_step(void);
 245 #endif
 246 #endif