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/*
* Copyright (C) 2003 Jeffrey Yasskin <jyasskin@mail.utexas.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* The Rhythmbox authors hereby grant permission for non-GPL compatible
* GStreamer plugins to be used and distributed together with GStreamer
* and Rhythmbox. This permission is above and beyond the permissions granted
* by the GPL license by which Rhythmbox is covered. If you modify this code
* you may extend this exception to your version of the code, but you are not
* obligated to do so. If you do not wish to do so, delete this exception
* statement from your version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include "config.h"
#include "rb-play-order-random-by-age-and-rating.h"
#include "rhythmdb.h"
#include <time.h>
#include <math.h>
static void rb_random_play_order_by_age_and_rating_class_init (RBRandomPlayOrderByAgeAndRatingClass *klass);
static double rb_random_by_age_and_rating_get_entry_weight (RBRandomPlayOrder *rorder,
RhythmDB *db, RhythmDBEntry *entry);
G_DEFINE_TYPE (RBRandomPlayOrderByAgeAndRating,
rb_random_play_order_by_age_and_rating,
RB_TYPE_RANDOM_PLAY_ORDER)
static void
rb_random_play_order_by_age_and_rating_class_init (RBRandomPlayOrderByAgeAndRatingClass *klass)
{
RBRandomPlayOrderClass *rorder;
rorder = RB_RANDOM_PLAY_ORDER_CLASS (klass);
rorder->get_entry_weight = rb_random_by_age_and_rating_get_entry_weight;
}
RBPlayOrder *
rb_random_play_order_by_age_and_rating_new (RBShellPlayer *player)
{
RBRandomPlayOrderByAgeAndRating *rorder;
rorder = g_object_new (RB_TYPE_RANDOM_PLAY_ORDER_BY_AGE_AND_RATING,
"player", player,
NULL);
return RB_PLAY_ORDER (rorder);
}
static void
rb_random_play_order_by_age_and_rating_init (RBRandomPlayOrderByAgeAndRating *porder)
{
}
static double
rb_random_by_age_and_rating_get_entry_weight (RBRandomPlayOrder *rorder, RhythmDB *db, RhythmDBEntry *entry)
{
time_t now;
gulong last_play;
gulong seconds_since_last_play = 0;
gdouble rating;
RhythmDBEntry *playing_entry;
/* This finds the log of the number of seconds since the last play.
* It handles never played automatically, since now-0 is a valid
* argument to log(). */
time (&now);
playing_entry = rb_play_order_get_playing_entry (RB_PLAY_ORDER (rorder));
if (playing_entry != entry) {
last_play = rhythmdb_entry_get_ulong (entry, RHYTHMDB_PROP_LAST_PLAYED);
seconds_since_last_play = now - last_play;
}
if (playing_entry != NULL)
rhythmdb_entry_unref (playing_entry);
/* The lowest weight should be 0. */
if (seconds_since_last_play < 1)
seconds_since_last_play = 1;
rating = rhythmdb_entry_get_double (entry, RHYTHMDB_PROP_RATING);
/* treat unrated as 2.5 for the purposes of probabilities */
if (rating < 0.01)
rating = 2.5;
return log (seconds_since_last_play) * (rating + 1.0);
}
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