2 * arch-tag: Implementation of random play order weighted by the time since last play and the rating
4 * Copyright (C) 2003 Jeffrey Yasskin <jyasskin@mail.utexas.edu>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
22 #include "rb-play-order-random-by-age-and-rating.h"
28 static void rb_random_play_order_by_age_and_rating_class_init (RBRandomPlayOrderByAgeAndRatingClass
*klass
);
30 static double rb_random_by_age_and_rating_get_entry_weight (RBRandomPlayOrder
*rorder
,
31 RhythmDB
*db
, RhythmDBEntry
*entry
);
33 G_DEFINE_TYPE (RBRandomPlayOrderByAgeAndRating
,
34 rb_random_play_order_by_age_and_rating
,
35 RB_TYPE_RANDOM_PLAY_ORDER
)
38 rb_random_play_order_by_age_and_rating_class_init (RBRandomPlayOrderByAgeAndRatingClass
*klass
)
40 RBRandomPlayOrderClass
*rorder
;
42 rorder
= RB_RANDOM_PLAY_ORDER_CLASS (klass
);
43 rorder
->get_entry_weight
= rb_random_by_age_and_rating_get_entry_weight
;
47 rb_random_play_order_by_age_and_rating_new (RBShellPlayer
*player
)
49 RBRandomPlayOrderByAgeAndRating
*rorder
;
51 rorder
= g_object_new (RB_TYPE_RANDOM_PLAY_ORDER_BY_AGE_AND_RATING
,
55 return RB_PLAY_ORDER (rorder
);
59 rb_random_play_order_by_age_and_rating_init (RBRandomPlayOrderByAgeAndRating
*porder
)
64 rb_random_by_age_and_rating_get_entry_weight (RBRandomPlayOrder
*rorder
, RhythmDB
*db
, RhythmDBEntry
*entry
)
68 gulong seconds_since_last_play
;
71 /* This finds the log of the number of seconds since the last play.
72 * It handles never played automatically, since now-0 is a valid
73 * argument to log(). */
75 last_play
= rhythmdb_entry_get_ulong (entry
, RHYTHMDB_PROP_LAST_PLAYED
);
76 seconds_since_last_play
= now
- last_play
;
77 /* The lowest weight should be 0. */
78 if (seconds_since_last_play
< 1)
79 seconds_since_last_play
= 1;
81 rating
= rhythmdb_entry_get_double (entry
, RHYTHMDB_PROP_RATING
);
83 /* treat unrated as 2.5 for the purposes of probabilities */
87 return log (seconds_since_last_play
) * (rating
+ 1.0);