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