2 * Copyright (C) 2007 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file mood.c Paraslash's mood handling functions. */
26 * Contains statistical data of the currently admissible audio files.
28 * It is used to assign normalized score values to each admissible audio file.
30 struct afs_statistics {
31 /** Sum of num played over all admissible files. */
32 int64_t num_played_sum;
33 /** Sum of last played times over all admissible files. */
34 int64_t last_played_sum;
35 /** Quadratic deviation of num played count. */
36 int64_t num_played_qd;
37 /** Quadratic deviation of last played time. */
38 int64_t last_played_qd;
39 /** Number of admissible files */
42 static struct afs_statistics statistics;
45 * Each line of the current mood corresponds to a mood_item.
48 /** The method this line is referring to. */
49 const struct mood_method *method;
50 /** The data structure computed by the mood parser. */
52 /** The given score value, or zero if none was given. */
54 /** Non-zero if random scoring was requested. */
56 /** Whether the "not" keyword was given in the mood line. */
58 /** The position in the list of items. */
59 struct list_head mood_item_node;
63 * Created from the mood definition by \ref change_current_mood().
65 * When a mood is opened, each line of its definition is investigated, and a
66 * corresponding mood item is produced. Each mood line starts with accept,
67 * deny, or score which determines the type of the mood line. For each such
68 * type a linked list is maintained whose entries are the mood items.
71 /** The name of this mood. */
73 /** The list of mood items of type \p accept. */
74 struct list_head accept_list;
75 /** The list of mood items of type \p deny. */
76 struct list_head deny_list;
77 /** The list of mood items of type \p score. */
78 struct list_head score_list;
82 * If current_mood is NULL then no mood is currently open. If
83 * current_mood->name is NULL, the dummy mood is currently open.
85 static struct mood *current_mood;
88 * Find the position of the most-significant set bit.
90 * Copied and slightly adapted from the linux source tree, version 4.9.39
93 __a_const static uint32_t fls64(uint64_t v)
96 const uint64_t ones = ~(uint64_t)0U;
98 if ((v & (ones << 32)) == 0) {
102 if ((v & (ones << (64 - 16))) == 0) {
106 if ((v & (ones << (64 - 8))) == 0) {
110 if ((v & (ones << (64 - 4))) == 0) {
114 if ((v & (ones << (64 - 2))) == 0) {
118 if ((v & (ones << (64 - 1))) == 0)
124 * Rough approximation to sqrt.
126 * It returns an integer res with res * res <= x. Taken 2007 from the linux
129 __a_const static uint64_t int_sqrt(uint64_t x)
131 uint64_t op, res, one = 1;
135 one = one << (fls64(x) & ~one);
137 if (op >= res + one) {
138 op = op - (res + one);
144 // PARA_NOTICE_LOG("sqrt(%llu) = %llu\n", x, res);
149 * Returns true if row matches, false if it does not match. In any case score
150 * and score_arg_sum are set/increased accordingly.
152 static bool get_item_score(struct mood_item *item, const struct afs_info *afsi,
153 const struct afh_info *afhi, const char *path, long *score,
159 *score_arg_sum += item->random_score? 100 : PARA_ABS(item->score_arg);
162 ret = item->method->score_function(path, afsi, afhi,
164 if ((ret < 0 && !item->logical_not) || (ret >= 0 && item->logical_not))
167 if (item->random_score)
168 *score = PARA_ABS(ret) * para_random(100);
170 *score = PARA_ABS(ret) * item->score_arg;
174 /* returns 1 if row admissible, 0 if not, negative on errors */
175 static int row_is_admissible(const struct osl_row *aft_row, struct mood *m,
178 struct mood_item *item;
181 long score_arg_sum = 0, score = 0, item_score;
182 struct afs_info afsi;
183 struct afh_info afhi;
188 ret = get_afsi_of_row(aft_row, &afsi);
191 ret = get_afhi_of_row(aft_row, &afhi);
194 ret = get_audio_file_path_of_row(aft_row, &path);
197 /* reject audio file if it matches any entry in the deny list */
198 list_for_each_entry(item, &m->deny_list, mood_item_node) {
199 match = get_item_score(item, &afsi, &afhi, path, &item_score,
201 if (match) /* not admissible */
206 list_for_each_entry(item, &m->accept_list, mood_item_node) {
207 ret = get_item_score(item, &afsi, &afhi, path, &item_score,
214 /* reject if there is no matching entry in the accept list */
215 if (!match && !list_empty(&m->accept_list))
217 list_for_each_entry(item, &m->score_list, mood_item_node) {
218 match = get_item_score(item, &afsi, &afhi, path, &item_score,
224 score /= score_arg_sum;
229 static void cleanup_list_entry(struct mood_item *item)
231 if (item->method && item->method->cleanup)
232 item->method->cleanup(item->parser_data);
234 free(item->parser_data);
235 list_del(&item->mood_item_node);
239 static void destroy_mood(struct mood *m)
241 struct mood_item *tmp, *item;
245 list_for_each_entry_safe(item, tmp, &m->accept_list, mood_item_node)
246 cleanup_list_entry(item);
247 list_for_each_entry_safe(item, tmp, &m->deny_list, mood_item_node)
248 cleanup_list_entry(item);
249 list_for_each_entry_safe(item, tmp, &m->score_list, mood_item_node)
250 cleanup_list_entry(item);
255 static struct mood *alloc_new_mood(const char *name)
257 struct mood *m = para_calloc(sizeof(struct mood));
259 m->name = para_strdup(name);
260 INIT_LIST_HEAD(&m->accept_list);
261 INIT_LIST_HEAD(&m->deny_list);
262 INIT_LIST_HEAD(&m->score_list);
266 /** The different types of a mood line. */
267 enum mood_line_type {
278 /** Data passed to the parser of a mood line. */
279 struct mood_line_parser_data {
280 /** The mood this mood line belongs to. */
282 /** The line number in the mood definition. */
287 * <accept [with score <score>] | deny [with score <score>] | score <score>>
288 * [if] [not] <mood_method> [options]
289 * <score> is either an integer or "random" which assigns a random score to
292 static int parse_mood_line(char *mood_line, void *data)
294 struct mood_line_parser_data *mlpd = data;
299 enum mood_line_type mlt = ML_INVALID;
300 struct mood_item *mi = NULL;
303 ret = create_argv(mood_line, " \t", &argv);
307 if (!num_words) /* empty line */
310 if (**w == '#') /* comment */
312 if (!strcmp(*w, "accept"))
314 else if (!strcmp(*w, "deny"))
316 else if (!strcmp(*w, "score"))
318 ret = -E_MOOD_SYNTAX;
319 if (mlt == ML_INVALID)
321 mi = para_calloc(sizeof(struct mood_item));
322 if (mlt != ML_SCORE) {
323 ret = -E_MOOD_SYNTAX;
327 if (strcmp(*w, "with"))
332 if (strcmp(*w, "score"))
335 if (mlt == ML_SCORE || !strcmp(*w, "score")) {
336 ret = -E_MOOD_SYNTAX;
340 if (strcmp(*w, "random")) {
341 mi->random_score = 0;
342 ret = para_atoi32(*w, &mi->score_arg);
346 mi->random_score = 1;
348 goto success; /* the line "score random" is valid */
352 ret = -E_MOOD_SYNTAX;
357 if (!strcmp(*w, "if")) {
358 ret = -E_MOOD_SYNTAX;
363 if (!strcmp(*w, "not")) {
364 ret = -E_MOOD_SYNTAX;
371 for (i = 0; mood_methods[i].parser; i++) {
372 if (strcmp(*w, mood_methods[i].name))
376 ret = -E_MOOD_SYNTAX;
377 if (!mood_methods[i].parser)
379 ret = mood_methods[i].parser(num_words - 1 - (w - argv), w,
383 mi->method = &mood_methods[i];
386 if (mlt == ML_ACCEPT)
387 para_list_add(&mi->mood_item_node, &mlpd->m->accept_list);
388 else if (mlt == ML_DENY)
389 para_list_add(&mi->mood_item_node, &mlpd->m->deny_list);
391 para_list_add(&mi->mood_item_node, &mlpd->m->score_list);
393 PARA_DEBUG_LOG("%s entry added, method: %p\n", mlt == ML_ACCEPT? "accept" :
394 (mlt == ML_DENY? "deny" : "score"), mi->method);
401 free(mi->parser_data);
407 static int load_mood(const struct osl_row *mood_row, struct mood **m)
410 struct osl_object mood_def;
411 struct mood_line_parser_data mlpd = {.line_num = 0};
415 ret = mood_get_name_and_def_by_row(mood_row, &mood_name, &mood_def);
420 mlpd.m = alloc_new_mood(mood_name);
421 ret = for_each_line(FELF_READ_ONLY, mood_def.data, mood_def.size,
422 parse_mood_line, &mlpd);
423 osl_close_disk_object(&mood_def);
425 PARA_ERROR_LOG("unable to load mood %s: %s\n", mlpd.m->name,
426 para_strerror(-ret));
427 destroy_mood(mlpd.m);
434 static int check_mood(struct osl_row *mood_row, void *data)
436 struct para_buffer *pb = data;
438 struct osl_object mood_def;
439 struct mood_line_parser_data mlpd = {.line_num = 0};
441 int ret = mood_get_name_and_def_by_row(mood_row, &mood_name, &mood_def);
444 para_printf(pb, "cannot read mood\n");
447 if (!*mood_name) /* ignore dummy row */
449 para_printf(pb, "checking mood %s...\n", mood_name);
450 ret = for_each_line(FELF_READ_ONLY, mood_def.data, mood_def.size,
451 parse_mood_line, &mlpd);
453 para_printf(pb, "mood %s: error in line %u: %s\n", mood_name,
454 mlpd.line_num, para_strerror(-ret));
455 ret = 1; /* don't fail the loop on invalid mood definitions */
457 osl_close_disk_object(&mood_def);
462 * Check all moods for syntax errors.
464 * \param aca Only ->pbout is used for diagnostics.
466 * \return Negative on fatal errors. Inconsistent mood definitions are not
467 * considered an error.
469 int mood_check_callback(struct afs_callback_arg *aca)
471 para_printf(&aca->pbout, "checking moods...\n");
472 return osl(osl_rbtree_loop(moods_table, BLOBCOL_ID, &aca->pbout,
476 static int64_t normalized_value(int64_t x, int64_t n, int64_t sum, int64_t qd)
480 return 100 * (n * x - sum) / (int64_t)int_sqrt(n) / (int64_t)int_sqrt(qd);
483 static long compute_score(struct afs_info *afsi, long mood_score)
485 mood_score -= normalized_value(afsi->num_played, statistics.num,
486 statistics.num_played_sum, statistics.num_played_qd);
487 mood_score -= normalized_value(afsi->last_played, statistics.num,
488 statistics.last_played_sum, statistics.last_played_qd);
489 return mood_score / 3;
492 static int add_afs_statistics(const struct osl_row *row)
495 struct afs_info afsi;
498 ret = get_afsi_of_row(row, &afsi);
502 x = afsi.last_played;
503 s = statistics.last_played_sum;
505 q = (x > s / n)? x - s / n : s / n - x;
506 statistics.last_played_qd += q * q * n / (n + 1);
508 statistics.last_played_sum += x;
511 s = statistics.num_played_sum;
513 q = (x > s / n)? x - s / n : s / n - x;
514 statistics.num_played_qd += q * q * n / (n + 1);
516 statistics.num_played_sum += x;
521 static int del_afs_statistics(const struct osl_row *row)
523 uint64_t n, s, q, a, new_s;
524 struct afs_info afsi;
526 ret = get_afsi_of_row(row, &afsi);
532 memset(&statistics, 0, sizeof(statistics));
536 s = statistics.last_played_sum;
537 q = statistics.last_played_qd;
538 a = afsi.last_played;
540 statistics.last_played_sum = new_s;
541 statistics.last_played_qd = q + s * s / n - a * a
542 - new_s * new_s / (n - 1);
544 s = statistics.num_played_sum;
545 q = statistics.num_played_qd;
548 statistics.num_played_sum = new_s;
549 statistics.num_played_qd = q + s * s / n - a * a
550 - new_s * new_s / (n - 1);
557 * At mood open time we determine the set of admissible files for the given
558 * mood. The mood score of each admissible file is computed by adding up all
559 * mood item scores. Next, we update the afs statistics and append a struct
560 * admissible_file_info to a temporary array.
562 * When all files have been processed in this way, the final score of each
563 * admissible file is computed by adding the dynamic score (which depends on
564 * the afs_statistics and the current time) to the mood score. Finally, all
565 * audio files in the temporary array are added to the score table and the
568 struct admissible_file_info
570 /** The admissible audio file. */
571 struct osl_row *aft_row;
576 /** The temporary array of admissible files. */
577 struct admissible_array {
578 /** Files are admissible wrt. this mood. */
580 /** The size of the array */
582 /** Pointer to the array of admissible files. */
583 struct admissible_file_info *array;
587 * Add an entry to the array of admissible files.
589 * \param aft_row The audio file to be added.
590 * \param private_data Pointer to a struct admissible_file_info.
592 * \return 1 if row admissible, 0 if not, negative on errors.
594 static int add_if_admissible(struct osl_row *aft_row, void *data)
596 struct admissible_array *aa = data;
600 ret = row_is_admissible(aft_row, aa->m, &score);
603 if (statistics.num >= aa->size) {
606 aa->array = para_realloc(aa->array,
607 aa->size * sizeof(struct admissible_file_info));
609 aa->array[statistics.num].aft_row = aft_row;
610 aa->array[statistics.num].score = score;
611 ret = add_afs_statistics(aft_row);
618 * Compute the new quadratic deviation in case one element changes.
620 * \param n Number of elements.
621 * \param old_qd The quadratic deviation before the change.
622 * \param old_val The value that was replaced.
623 * \param new_val The replacement value.
624 * \param old_sum The sum of all elements before the update.
626 * \return The new quadratic deviation resulting from replacing old_val
629 * Given n real numbers a_1, ..., a_n, their sum S = a_1 + ... + a_n,
630 * their quadratic deviation
632 * q = (a_1 - S/n)^2 + ... + (a_n - S/n)^2,
634 * and a real number b, the quadratic deviation q' of a_1,...a_{n-1}, b (ie.
635 * the last number a_n was replaced by b) may be computed in O(1) time in terms
636 * of n, q, a_n, b, and S as
638 * q' = q + d * s - (2 * S + d) * d / n
639 * = q + d * (s - 2 * S / n - d /n),
641 * where d = b - a_n, and s = b + a_n.
643 * Example: n = 3, a_1 = 3, a_2 = 5, a_3 = 7, b = 10. Then S = 15, q = 8, d = 3,
646 * q + d * s - (2 * S + d) * d / n = 8 + 51 - 33 = 26,
648 * which equals q' = (3 - 6)^2 + (5 - 6)^2 + (10 - 6)^2.
651 _static_inline_ int64_t update_quadratic_deviation(int64_t n, int64_t old_qd,
652 int64_t old_val, int64_t new_val, int64_t old_sum)
654 int64_t delta = new_val - old_val;
655 int64_t sigma = new_val + old_val;
656 return old_qd + delta * (sigma - 2 * old_sum / n - delta / n);
659 static int update_afs_statistics(struct afs_info *old_afsi,
660 struct afs_info *new_afsi)
663 int ret = get_num_admissible_files(&n);
669 statistics.last_played_qd = update_quadratic_deviation(n,
670 statistics.last_played_qd, old_afsi->last_played,
671 new_afsi->last_played, statistics.last_played_sum);
672 statistics.last_played_sum += new_afsi->last_played - old_afsi->last_played;
674 statistics.num_played_qd = update_quadratic_deviation(n,
675 statistics.num_played_qd, old_afsi->num_played,
676 new_afsi->num_played, statistics.num_played_sum);
677 statistics.num_played_sum += new_afsi->num_played - old_afsi->num_played;
681 static int add_to_score_table(const struct osl_row *aft_row, long mood_score)
684 struct afs_info afsi;
685 int ret = get_afsi_of_row(aft_row, &afsi);
689 score = compute_score(&afsi, mood_score);
690 return score_add(aft_row, score);
693 static int delete_from_statistics_and_score_table(const struct osl_row *aft_row)
695 int ret = del_afs_statistics(aft_row);
698 return score_delete(aft_row);
702 * Delete one entry from the statistics and from the score table.
704 * \param aft_row The audio file which is no longer admissible.
706 * \return Positive on success, negative on errors.
708 * \sa \ref score_delete().
710 static int mood_delete_audio_file(const struct osl_row *aft_row)
714 ret = row_belongs_to_score_table(aft_row, NULL);
717 if (!ret) /* not admissible, nothing to do */
719 return delete_from_statistics_and_score_table(aft_row);
723 * Compute the new score of an audio file wrt. the current mood.
725 * \param aft_row Determines the audio file.
726 * \param old_afsi The audio file selector info before updating.
728 * The \a old_afsi argument may be \p NULL which indicates that no changes to
729 * the audio file info were made.
731 * \return Positive on success, negative on errors.
733 static int mood_update_audio_file(const struct osl_row *aft_row,
734 struct afs_info *old_afsi)
737 int ret, is_admissible, was_admissible = 0;
738 struct afs_info afsi;
742 return 1; /* nothing to do */
743 ret = row_belongs_to_score_table(aft_row, &rank);
746 was_admissible = ret;
747 ret = row_is_admissible(aft_row, current_mood, &score);
750 is_admissible = (ret > 0);
751 if (!was_admissible && !is_admissible)
753 if (was_admissible && !is_admissible)
754 return delete_from_statistics_and_score_table(aft_row);
755 if (!was_admissible && is_admissible) {
756 ret = add_afs_statistics(aft_row);
759 return add_to_score_table(aft_row, score);
762 ret = get_afsi_of_row(aft_row, &afsi);
766 ret = update_afs_statistics(old_afsi, &afsi);
770 score = compute_score(&afsi, score);
771 PARA_DEBUG_LOG("score: %li\n", score);
772 percent = (score + 100) / 3;
775 else if (percent < 0)
777 PARA_DEBUG_LOG("moving from rank %u to %li%%\n", rank, percent);
778 return score_update(aft_row, percent);
781 static void log_statistics(void)
783 unsigned n = statistics.num;
784 int mean_days, sigma_days;
786 * We can not use the "now" pointer from sched.c here because we are
787 * called before schedule(), which initializes "now".
791 assert(current_mood);
792 PARA_NOTICE_LOG("loaded mood %s\n", current_mood->name?
793 current_mood->name : "(dummy)");
795 PARA_WARNING_LOG("no admissible files\n");
798 PARA_NOTICE_LOG("%u admissible files\n", statistics.num);
799 clock_get_realtime(&rnow);
800 mean_days = (rnow.tv_sec - statistics.last_played_sum / n) / 3600 / 24;
801 sigma_days = int_sqrt(statistics.last_played_qd / n) / 3600 / 24;
802 PARA_NOTICE_LOG("last_played mean/sigma: %d/%d days\n", mean_days, sigma_days);
803 PARA_NOTICE_LOG("num_played mean/sigma: %llu/%llu\n",
804 (long long unsigned)statistics.num_played_sum / n,
805 (long long unsigned)int_sqrt(statistics.num_played_qd / n));
809 * Close the current mood.
811 * Frees all resources of the current mood.
813 void close_current_mood(void)
815 destroy_mood(current_mood);
817 memset(&statistics, 0, sizeof(statistics));
821 * Change the current mood.
823 * \param mood_name The name of the mood to open.
825 * If \a mood_name is \a NULL, load the dummy mood that accepts every audio file
826 * and uses a scoring method based only on the \a last_played information.
828 * If there is already an open mood, it will be closed first.
830 * \return Positive on success, negative on errors. Loading the dummy mood
833 * \sa struct \ref afs_info::last_played.
835 int change_current_mood(const char *mood_name)
838 struct admissible_array aa = {
846 struct osl_object obj = {
847 .data = (char *)mood_name,
848 .size = strlen(mood_name) + 1
850 ret = osl(osl_get_row(moods_table, BLOBCOL_NAME, &obj, &row));
852 PARA_NOTICE_LOG("no such mood: %s\n", mood_name);
855 ret = load_mood(row, &m);
858 close_current_mood();
860 } else { /* load dummy mood */
861 close_current_mood();
862 current_mood = alloc_new_mood(NULL);
865 PARA_NOTICE_LOG("computing statistics of admissible files\n");
866 ret = audio_file_loop(&aa, add_if_admissible);
869 for (i = 0; i < statistics.num; i++) {
870 struct admissible_file_info *a = aa.array + i;
871 ret = add_to_score_table(a->aft_row, a->score);
876 ret = statistics.num;
883 * Close and re-open the current mood.
885 * This function is called on events which render the current list of
886 * admissible files useless, for example if an attribute is removed from the
889 * If no mood is currently open, the function returns success.
891 static int reload_current_mood(void)
894 char *mood_name = NULL;
896 ret = clear_score_table();
901 PARA_NOTICE_LOG("reloading %s\n", current_mood->name?
902 current_mood->name : "(dummy)");
903 if (current_mood->name)
904 mood_name = para_strdup(current_mood->name);
905 close_current_mood();
906 ret = change_current_mood(mood_name);
912 * Notification callback for the moods table.
914 * \param event Type of the event just occurred.
916 * \param data Its type depends on the event.
918 * This function performs actions required due to the occurrence of the given
919 * event. Possible actions include reload of the current mood and update of the
920 * score of an audio file.
924 int moods_event_handler(enum afs_events event, __a_unused struct para_buffer *pb,
931 * The three blob events might change the set of admissible files,
932 * so we must reload the score list.
937 if (data == moods_table || data == playlists_table)
938 return 1; /* no reload necessary for these */
939 return reload_current_mood();
940 /* these also require reload of the score table */
942 case ATTRIBUTE_REMOVE:
943 case ATTRIBUTE_RENAME:
944 return reload_current_mood();
945 /* changes to the aft only require to re-examine the audio file */
947 struct afsi_change_event_data *aced = data;
948 return mood_update_audio_file(aced->aft_row, aced->old_afsi);
951 case AUDIO_FILE_RENAME:
953 return mood_update_audio_file(data, NULL);
954 case AUDIO_FILE_REMOVE:
955 return mood_delete_audio_file(data);