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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 by Miika Pekkarinen
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef _TAGCACHE_H
#define _TAGCACHE_H
#include "id3.h"
enum tag_type { tag_artist = 0, tag_album, tag_genre, tag_title,
tag_filename, tag_composer, tag_year, tag_tracknumber,
tag_bitrate, tag_length, tag_playcount, tag_playtime, tag_lastplayed,
/* Virtual tags */
tag_virt_autoscore };
#define TAG_COUNT 13
/* Allow a little drift to the filename ordering (should not be too high/low). */
#define POS_HISTORY_COUNT 4
/* How much to pre-load entries while committing to prevent seeking. */
#define IDX_BUF_DEPTH 64
/* Tag Cache Header version 'TCHxx'. Increment when changing internal structures. */
#define TAGCACHE_MAGIC 0x54434806
/* How much to allocate extra space for ramcache. */
#define TAGCACHE_RESERVE 32768
/**
* Define how long one entry must be at least (longer -> less memory at commit).
* Must be at least 4 bytes in length for correct alignment.
*/
#define TAGFILE_ENTRY_CHUNK_LENGTH 8
/* Used to guess the necessary buffer size at commit. */
#define TAGFILE_ENTRY_AVG_LENGTH 16
/* How many entries to fetch to the seek table at once while searching. */
#define SEEK_LIST_SIZE 32
/* Always strict align entries for best performance and binary compatability. */
#define TAGCACHE_STRICT_ALIGN 1
#define TAGCACHE_MAX_FILTERS 4
#define TAGCACHE_MAX_CLAUSES 16
/* Tag database files. */
#define TAGCACHE_FILE_TEMP ROCKBOX_DIR "/tagcache_tmp.tcd"
#define TAGCACHE_FILE_MASTER ROCKBOX_DIR "/tagcache_idx.tcd"
#define TAGCACHE_FILE_INDEX ROCKBOX_DIR "/tagcache_%d.tcd"
#define TAGCACHE_FILE_CHANGELOG ROCKBOX_DIR "/tagcache_changelog.txt"
#define TAGCACHE_STATEFILE ROCKBOX_DIR "/tagcache_state.tcd"
/* Flags */
#define FLAG_DELETED 0x0001 /* Entry has been removed from db */
#define FLAG_DIRCACHE 0x0002 /* Filename is a dircache pointer */
#define FLAG_DIRTYNUM 0x0004 /* Numeric data has been modified */
#define FLAG_GET_ATTR(flag) ((flag >> 16) & 0x0000ffff)
#define FLAG_SET_ATTR(flag,attr) flag = (flag & 0x0000ffff) | (attr << 16)
enum clause { clause_none, clause_is, clause_is_not, clause_gt, clause_gteq,
clause_lt, clause_lteq, clause_contains, clause_not_contains,
clause_begins_with, clause_not_begins_with, clause_ends_with,
clause_not_ends_with };
struct tagcache_stat {
bool initialized; /* Is tagcache currently busy? */
bool ready; /* Is tagcache ready to be used? */
bool ramcache; /* Is tagcache loaded in ram? */
bool commit_delayed; /* Has commit been delayed until next reboot? */
int commit_step; /* Commit progress */
int ramcache_allocated; /* Has ram been allocated for ramcache? */
int ramcache_used; /* How much ram has been really used */
int progress; /* Current progress of disk scan */
int processed_entries; /* Scanned disk entries so far */
};
struct tagcache_search_clause
{
int tag;
int type;
bool numeric;
bool input;
long numeric_data;
char str[32];
};
struct tagcache_search {
/* For internal use only. */
int fd, masterfd;
int idxfd[TAG_COUNT];
long seek_list[SEEK_LIST_SIZE];
long seek_flags[SEEK_LIST_SIZE];
long filter_tag[TAGCACHE_MAX_FILTERS];
long filter_seek[TAGCACHE_MAX_FILTERS];
int filter_count;
struct tagcache_search_clause *clause[TAGCACHE_MAX_CLAUSES];
int clause_count;
int seek_list_count;
int seek_pos;
long position;
int entry_count;
bool valid;
bool initialized;
long *unique_list;
int unique_list_capacity;
int unique_list_count;
/* Exported variables. */
bool ramsearch;
bool ramresult;
int type;
char *result;
int result_len;
long result_seek;
int idx_id;
};
int tagcache_str_to_tag(const char *str);
const char* tagcache_tag_to_str(int tag);
bool tagcache_is_numeric_tag(int type);
bool tagcache_is_unique_tag(int type);
bool tagcache_is_sorted_tag(int type);
bool tagcache_find_index(struct tagcache_search *tcs, const char *filename);
bool tagcache_search(struct tagcache_search *tcs, int tag);
void tagcache_search_set_uniqbuf(struct tagcache_search *tcs,
void *buffer, long length);
bool tagcache_search_add_filter(struct tagcache_search *tcs,
int tag, int seek);
bool tagcache_search_add_clause(struct tagcache_search *tcs,
struct tagcache_search_clause *clause);
bool tagcache_get_next(struct tagcache_search *tcs);
bool tagcache_retrieve(struct tagcache_search *tcs, int idxid,
char *buf, long size);
void tagcache_search_finish(struct tagcache_search *tcs);
long tagcache_get_numeric(const struct tagcache_search *tcs, int tag);
long tagcache_increase_serial(void);
long tagcache_get_serial(void);
bool tagcache_import_changelog(void);
bool tagcache_create_changelog(struct tagcache_search *tcs);
bool tagcache_modify_numeric_entry(struct tagcache_search *tcs,
int tag, long data);
struct tagcache_stat* tagcache_get_stat(void);
int tagcache_get_commit_step(void);
bool tagcache_prepare_shutdown(void);
#ifdef HAVE_TC_RAMCACHE
bool tagcache_is_ramcache(void);
bool tagcache_fill_tags(struct mp3entry *id3, const char *filename);
void tagcache_unload_ramcache(void);
#endif
void tagcache_init(void);
bool tagcache_is_initialized(void);
void tagcache_start_scan(void);
void tagcache_stop_scan(void);
bool tagcache_update(void);
bool tagcache_rebuild(void);
#endif
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