2 * Copyright (C) 2007-2012 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file mood.c Paraslash's mood handling functions. */
22 * Contains statistical data of the currently admissible audio files.
24 * It is used to assign normalized score values to each admissible audio file.
26 struct afs_statistics {
27 /** Sum of num played over all admissible files. */
28 int64_t num_played_sum;
29 /** Sum of last played times over all admissible files. */
30 int64_t last_played_sum;
31 /** Quadratic deviation of num played time. */
32 int64_t num_played_qd;
33 /** Quadratic deviation of last played time. */
34 int64_t last_played_qd;
35 /** Number of admissible files */
38 static struct afs_statistics statistics;
41 * Each line of the current mood corresponds to a mood_item.
44 /** The method this line is referring to. */
45 const struct mood_method *method;
46 /** The data structure computed by the mood parser. */
48 /** The given score value, or zero if none was given. */
50 /** Non-zero if random scoring was requested. */
52 /** Whether the "not" keyword was given in the mood line. */
54 /** The position in the list of items. */
55 struct list_head mood_item_node;
59 * Created from the mood definition by mood_open().
61 * When a mood is opened, each line of its definition is investigated, and a
62 * corresponding mood item is produced. Each mood line starts with \p accept,
63 * \p deny, or \p score which determines the type of the mood line. For each
64 * such type a linked list is maintained whose entries are the mood items.
66 * \sa mood_item, mood_open().
69 /** The name of this mood. */
71 /** The list of mood items of type \p accept. */
72 struct list_head accept_list;
73 /** The list of mood items of type \p deny. */
74 struct list_head deny_list;
75 /** The list of mood items of type \p score. */
76 struct list_head score_list;
79 static struct mood *current_mood;
82 * Rough approximation to sqrt.
84 * \param x Integer of which to calculate the sqrt.
86 * \return An integer res with res * res <= x.
88 __a_const static uint64_t int_sqrt(uint64_t x)
90 uint64_t op, res, one = 1;
99 if (op >= res + one) {
100 op = op - (res + one);
106 // PARA_NOTICE_LOG("sqrt(%llu) = %llu\n", x, res);
111 * Returns true if row matches, false if it does not match. In any case score
112 * and score_arg_sum are set/increased accordingly.
114 static bool get_item_score(struct mood_item *item, const struct afs_info *afsi,
115 const struct afh_info *afhi, const char *path, long *score,
121 *score_arg_sum += item->random_score? 100 : PARA_ABS(item->score_arg);
124 ret = item->method->score_function(path, afsi, afhi,
126 if ((ret < 0 && !item->logical_not) || (ret >= 0 && item->logical_not))
129 if (item->random_score)
130 *score = PARA_ABS(ret) * para_random(100);
132 *score = PARA_ABS(ret) * item->score_arg;
136 /* returns 1 if row admissible, 0 if not, negative on errors */
137 static int compute_mood_score(const struct osl_row *aft_row, struct mood *m,
140 struct mood_item *item;
143 long score_arg_sum = 0, score = 0, item_score;
144 struct afs_info afsi;
145 struct afh_info afhi;
150 ret = get_afsi_of_row(aft_row, &afsi);
153 ret = get_afhi_of_row(aft_row, &afhi);
156 ret = get_audio_file_path_of_row(aft_row, &path);
159 /* reject audio file if it matches any entry in the deny list */
160 list_for_each_entry(item, &m->deny_list, mood_item_node) {
161 match = get_item_score(item, &afsi, &afhi, path, &item_score,
163 if (match) /* not admissible */
168 list_for_each_entry(item, &m->accept_list, mood_item_node) {
169 ret = get_item_score(item, &afsi, &afhi, path, &item_score,
176 /* reject if there is no matching entry in the accept list */
177 if (!match && !list_empty(&m->accept_list))
179 list_for_each_entry(item, &m->score_list, mood_item_node) {
180 match = get_item_score(item, &afsi, &afhi, path, &item_score,
186 score /= score_arg_sum;
191 static void cleanup_list_entry(struct mood_item *item)
193 if (item->method && item->method->cleanup)
194 item->method->cleanup(item->parser_data);
196 free(item->parser_data);
197 list_del(&item->mood_item_node);
201 static void destroy_mood(struct mood *m)
203 struct mood_item *tmp, *item;
207 list_for_each_entry_safe(item, tmp, &m->accept_list, mood_item_node)
208 cleanup_list_entry(item);
209 list_for_each_entry_safe(item, tmp, &m->deny_list, mood_item_node)
210 cleanup_list_entry(item);
211 list_for_each_entry_safe(item, tmp, &m->score_list, mood_item_node)
212 cleanup_list_entry(item);
217 static struct mood *alloc_new_mood(const char *name)
219 struct mood *m = para_calloc(sizeof(struct mood));
220 m->name = para_strdup(name);
221 INIT_LIST_HEAD(&m->accept_list);
222 INIT_LIST_HEAD(&m->deny_list);
223 INIT_LIST_HEAD(&m->score_list);
227 /** The different types of a mood line. */
228 enum mood_line_type {
239 /** Data passed to the parser of a mood line. */
240 struct mood_line_parser_data {
241 /** The mood this mood line belongs to. */
243 /** The line number in the mood definition. */
248 * <accept [with score <score>] | deny [with score <score>] | score <score>>
249 * [if] [not] <mood_method> [options]
250 * <score> is either an integer or "random" which assigns a random score to
254 static int parse_mood_line(char *mood_line, void *data)
256 struct mood_line_parser_data *mlpd = data;
261 enum mood_line_type mlt = ML_INVALID;
262 struct mood_item *mi = NULL;
265 ret = create_argv(mood_line, " \t", &argv);
269 if (!num_words) /* empty line */
272 if (**w == '#') /* comment */
274 if (!strcmp(*w, "accept"))
276 else if (!strcmp(*w, "deny"))
278 else if (!strcmp(*w, "score"))
280 ret = -E_MOOD_SYNTAX;
281 if (mlt == ML_INVALID)
283 mi = para_calloc(sizeof(struct mood_item));
284 if (mlt != ML_SCORE) {
285 ret = -E_MOOD_SYNTAX;
289 if (strcmp(*w, "with"))
294 if (strcmp(*w, "score"))
297 if (mlt == ML_SCORE || !strcmp(*w, "score")) {
298 ret = -E_MOOD_SYNTAX;
302 if (strcmp(*w, "random")) {
303 mi->random_score = 0;
304 ret = para_atoi32(*w, &mi->score_arg);
308 mi->random_score = 1;
310 goto success; /* the line "score random" is valid */
314 ret = -E_MOOD_SYNTAX;
319 if (!strcmp(*w, "if")) {
320 ret = -E_MOOD_SYNTAX;
325 if (!strcmp(*w, "not")) {
326 ret = -E_MOOD_SYNTAX;
333 for (i = 0; mood_methods[i].parser; i++) {
334 if (strcmp(*w, mood_methods[i].name))
338 ret = -E_MOOD_SYNTAX;
339 if (!mood_methods[i].parser)
341 ret = mood_methods[i].parser(num_words - 1 - (w - argv), w,
345 mi->method = &mood_methods[i];
348 if (mlt == ML_ACCEPT)
349 para_list_add(&mi->mood_item_node, &mlpd->m->accept_list);
350 else if (mlt == ML_DENY)
351 para_list_add(&mi->mood_item_node, &mlpd->m->deny_list);
353 para_list_add(&mi->mood_item_node, &mlpd->m->score_list);
355 PARA_DEBUG_LOG("%s entry added, method: %p\n", mlt == ML_ACCEPT? "accept" :
356 (mlt == ML_DENY? "deny" : "score"), mi->method);
363 free(mi->parser_data);
369 static int load_mood(const struct osl_row *mood_row, struct mood **m)
372 struct osl_object mood_def;
373 struct mood_line_parser_data mlpd = {.line_num = 0};
377 ret = mood_get_name_and_def_by_row(mood_row, &mood_name, &mood_def);
382 mlpd.m = alloc_new_mood(mood_name);
383 ret = for_each_line_ro(mood_def.data, mood_def.size,
384 parse_mood_line, &mlpd);
385 osl_close_disk_object(&mood_def);
387 PARA_ERROR_LOG("unable to load mood %s: %s\n", mlpd.m->name,
388 para_strerror(-ret));
389 destroy_mood(mlpd.m);
396 static int check_mood(struct osl_row *mood_row, void *data)
398 struct para_buffer *pb = data;
400 struct osl_object mood_def;
401 struct mood_line_parser_data mlpd = {.line_num = 0};
403 int ret = mood_get_name_and_def_by_row(mood_row, &mood_name, &mood_def);
406 para_printf(pb, "failed to get mood definition: %s\n",
407 para_strerror(-ret));
410 if (!*mood_name) /* ignore dummy row */
412 ret = para_printf(pb, "checking mood %s...\n", mood_name);
415 ret = for_each_line_ro(mood_def.data, mood_def.size,
416 parse_mood_line, &mlpd);
418 para_printf(pb, "%s line %u: %s\n", mood_name, mlpd.line_num,
419 para_strerror(-ret));
421 osl_close_disk_object(&mood_def);
426 * Check all moods for syntax errors.
428 * \param fd The afs socket.
429 * \param query Unused.
431 void mood_check_callback(int fd, __a_unused const struct osl_object *query)
433 struct para_buffer pb = {
434 .max_size = shm_get_shmmax(),
436 .max_size_handler = pass_buffer_as_shm
439 int ret = para_printf(&pb, "checking moods...\n");
442 osl_rbtree_loop(moods_table, BLOBCOL_ID, &pb,
445 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
450 static unsigned int_log2(uint64_t x)
462 static int64_t normalized_value(int64_t x, int64_t n, int64_t sum, int64_t qd)
466 return 100 * (n * x - sum) / (int64_t)int_sqrt(n * qd);
469 static long compute_num_played_score(struct afs_info *afsi)
471 return -normalized_value(afsi->num_played, statistics.num,
472 statistics.num_played_sum, statistics.num_played_qd);
475 static long compute_last_played_score(struct afs_info *afsi)
477 return -normalized_value(afsi->last_played, statistics.num,
478 statistics.last_played_sum, statistics.last_played_qd);
481 static long compute_dynamic_score(const struct osl_row *aft_row)
483 struct afs_info afsi;
484 int64_t score, nscore = 0, lscore = 0;
487 ret = get_afsi_of_row(aft_row, &afsi);
490 nscore = compute_num_played_score(&afsi);
491 lscore = compute_last_played_score(&afsi);
492 score = nscore + lscore;
496 static int add_afs_statistics(const struct osl_row *row)
499 struct afs_info afsi;
502 ret = get_afsi_of_row(row, &afsi);
506 x = afsi.last_played;
507 s = statistics.last_played_sum;
509 statistics.last_played_qd += (x - s / n) * (x - s / n) * n / (n + 1);
510 statistics.last_played_sum += x;
513 s = statistics.num_played_sum;
515 statistics.num_played_qd += (x - s / n) * (x - s / n) * 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 * Structure used during mood_open().
559 * At mood open time, we look at each file in the audio file table in order to
560 * determine whether it is admissible. If a file happens to be admissible, its
561 * mood score is computed by calling each relevant mood_score_function. Next,
562 * we update the afs_statistics and add a struct admissible_file_info to a
565 * If all files have been processed that way, the final score of each
566 * admissible file is computed by adding the dynamic score (which depends on
567 * the afs_statistics) to the mood score. Finally, all audio files in the
568 * array are added to the score table and the admissible array is freed.
570 * \sa mood_method, admissible_array.
572 struct admissible_file_info
574 /** The admissible audio file. */
575 struct osl_row *aft_row;
580 /** The temporary array of admissible files. */
581 struct admissible_array {
582 /** Files are admissible wrt. this mood. */
584 /** The size of the array */
586 /** Pointer to the array of admissible files. */
587 struct admissible_file_info *array;
591 * Add an entry to the array of admissible files.
593 * \param aft_row The audio file to be added.
594 * \param private_data Pointer to a struct admissible_file_info.
596 * \return 1 if row admissible, 0 if not, negative on errors.
598 static int add_if_admissible(struct osl_row *aft_row, void *data)
600 struct admissible_array *aa = data;
604 ret = compute_mood_score(aft_row, aa->m, &score);
607 if (statistics.num >= aa->size) {
610 aa->array = para_realloc(aa->array,
611 aa->size * sizeof(struct admissible_file_info));
613 aa->array[statistics.num].aft_row = aft_row;
614 aa->array[statistics.num].score = score;
615 ret = add_afs_statistics(aft_row);
622 * Compute the new quadratic deviation in case one element changes.
624 * \param n Number of elements.
625 * \param old_qd The quadratic deviation before the change.
626 * \param old_val The value that was replaced.
627 * \param new_val The replacement value.
628 * \param old_sum The sum of all elements before the update.
630 * \return The new quadratic deviation resulting from replacing old_val
633 * Given n real numbers a_1, ..., a_n, their sum S = a_1 + ... + a_n,
634 * their quadratic deviation
636 * q = (a_1 - S/n)^2 + ... + (a_n - S/n)^2,
638 * and a real number b, the quadratic deviation q' of a_1,...a_{n-1}, b (ie.
639 * the last number a_n was replaced by b) may be computed in O(1) time in terms
640 * of n, q, a_n, b, and S as
642 * q' = q + d * s - (2 * S + d) * d / n,
644 * where d = b - a_n, and s = b + a_n.
646 * Example: n = 3, a_1 = 3, a_2 = 5, a_3 = 7, b = 10. Then S = 15, q = 8, d = 3,
649 * q + d * s - (2 * S + d) * d / n = 8 + 51 - 33 = 26,
651 * which equals q' = (3 - 6)^2 + (5 - 6)^2 + (10 - 6)^2.
654 _static_inline_ int64_t update_quadratic_deviation(int64_t n, int64_t old_qd,
655 int64_t old_val, int64_t new_val, int64_t old_sum)
657 int64_t delta = new_val - old_val;
658 int64_t sigma = new_val + old_val;
659 return old_qd + delta * sigma - (2 * old_sum + delta) * delta / n;
662 static int update_afs_statistics(struct afs_info *old_afsi, struct afs_info *new_afsi)
665 int ret = get_num_admissible_files(&n);
671 statistics.last_played_qd = update_quadratic_deviation(n,
672 statistics.last_played_qd, old_afsi->last_played,
673 new_afsi->last_played, statistics.last_played_sum);
674 statistics.last_played_sum += new_afsi->last_played - old_afsi->last_played;
676 statistics.num_played_qd = update_quadratic_deviation(n,
677 statistics.num_played_qd, old_afsi->num_played,
678 new_afsi->num_played, statistics.num_played_sum);
679 statistics.num_played_sum += new_afsi->num_played - old_afsi->num_played;
683 static int add_to_score_table(const struct osl_row *aft_row, long mood_score)
685 long score = (compute_dynamic_score(aft_row) + mood_score) / 3;
686 return score_add(aft_row, score);
689 static int delete_from_statistics_and_score_table(const struct osl_row *aft_row)
691 int ret = del_afs_statistics(aft_row);
694 return score_delete(aft_row);
698 * Delete one entry from the statistics and from the score table.
700 * \param aft_row The audio file which is no longer admissible.
702 * \return Positive on success, negative on errors.
704 * \sa score_delete().
706 static int mood_delete_audio_file(const struct osl_row *aft_row)
710 ret = row_belongs_to_score_table(aft_row, NULL);
713 if (!ret) /* not admissible, nothing to do */
715 return delete_from_statistics_and_score_table(aft_row);
719 * Compute the new score of an audio file wrt. the current mood.
721 * \param aft_row Determines the audio file.
722 * \param old_afsi The audio file selector info before updating.
724 * The \a old_afsi argument may be \p NULL which indicates that no changes to
725 * the audio file info were made.
727 * \return Positive on success, negative on errors.
729 static int mood_update_audio_file(const struct osl_row *aft_row,
730 struct afs_info *old_afsi)
733 int ret, is_admissible, was_admissible = 0;
734 struct afs_info afsi;
738 return 1; /* nothing to do */
739 ret = row_belongs_to_score_table(aft_row, &rank);
742 was_admissible = ret;
743 ret = compute_mood_score(aft_row, current_mood, &score);
746 is_admissible = (ret > 0);
747 if (!was_admissible && !is_admissible)
749 if (was_admissible && !is_admissible)
750 return delete_from_statistics_and_score_table(aft_row);
751 if (!was_admissible && is_admissible) {
752 ret = add_afs_statistics(aft_row);
755 return add_to_score_table(aft_row, score);
758 ret = get_afsi_of_row(aft_row, &afsi);
762 ret = update_afs_statistics(old_afsi, &afsi);
766 score += compute_num_played_score(&afsi);
767 score += compute_last_played_score(&afsi);
769 PARA_DEBUG_LOG("score: %li\n", score);
770 percent = (score + 100) / 3;
773 else if (percent < 0)
775 PARA_DEBUG_LOG("moving from rank %u to %lu%%\n", rank, percent);
776 return score_update(aft_row, percent);
779 static void log_statistics(void)
781 unsigned n = statistics.num;
784 PARA_NOTICE_LOG("no admissible files\n");
787 PARA_INFO_LOG("last_played mean: %lli, last_played sigma: %llu\n",
788 (long long int)(statistics.last_played_sum / n),
789 (long long unsigned)int_sqrt(statistics.last_played_qd / n));
790 PARA_INFO_LOG("num_played mean: %lli, num_played sigma: %llu\n",
791 (long long int)statistics.num_played_sum / n,
792 (long long unsigned)int_sqrt(statistics.num_played_qd / n));
796 * Close the current mood.
798 * Free all resources of the current mood which were allocated during
801 void close_current_mood(void)
803 destroy_mood(current_mood);
805 memset(&statistics, 0, sizeof(statistics));
809 * Change the current mood.
811 * \param mood_name The name of the mood to open.
813 * If \a mood_name is \a NULL, load the dummy mood that accepts every audio file
814 * and uses a scoring method based only on the \a last_played information.
816 * If there is already an open mood, it will be closed first.
818 * \return Positive on success, negative on errors. Loading the dummy mood
821 * \sa struct admissible_file_info, struct admissible_array, struct
822 * afs_info::last_played, mood_close().
824 int change_current_mood(char *mood_name)
827 struct admissible_array aa = {
835 struct osl_object obj = {
837 .size = strlen(mood_name) + 1
839 ret = osl(osl_get_row(moods_table, BLOBCOL_NAME, &obj, &row));
841 PARA_NOTICE_LOG("no such mood: %s\n", mood_name);
844 ret = load_mood(row, &m);
847 close_current_mood();
850 close_current_mood();
851 current_mood = alloc_new_mood("dummy");
854 PARA_NOTICE_LOG("computing statistics of admissible files\n");
855 ret = audio_file_loop(&aa, add_if_admissible);
859 PARA_INFO_LOG("%d admissible files \n", statistics.num);
860 for (i = 0; i < statistics.num; i++) {
861 struct admissible_file_info *a = aa.array + i;
862 ret = add_to_score_table(a->aft_row, a->score);
866 PARA_NOTICE_LOG("loaded mood %s\n", current_mood->name);
867 ret = statistics.num;
873 * Close and re-open the current mood.
875 * This function is used if changes to the audio file table or the
876 * attribute table were made that render the current list of admissible
877 * files useless. For example, if an attribute is removed from the
878 * attribute table, this function is called.
880 * \return Positive on success, negative on errors. If no mood is currently
881 * open, the function returns success.
883 * \sa mood_open(), mood_close().
885 static int reload_current_mood(void)
888 char *mood_name = NULL;
892 PARA_NOTICE_LOG("reloading %s\n", current_mood->name?
893 current_mood->name : "(dummy)");
894 if (current_mood->name)
895 mood_name = para_strdup(current_mood->name);
896 close_current_mood();
897 ret = change_current_mood(mood_name);
903 * Notification callback for the moods table.
905 * \param event Type of the event just occurred.
907 * \param data Its type depends on the event.
909 * This function performs actions required due to the occurrence of the given
910 * event. Possible actions include reload of the current mood and update of the
911 * score of an audio file.
913 int moods_event_handler(enum afs_events event, __a_unused struct para_buffer *pb,
922 * The three blob events might change the set of admissible files,
923 * so we must reload the score list.
928 if (data == moods_table || data == playlists_table)
929 return 1; /* no reload necessary for these */
930 ret = clear_score_table();
932 PARA_CRIT_LOG("clear score table returned %s\n",
933 para_strerror(-ret));
934 return reload_current_mood();
935 /* these also require reload of the score table */
937 case ATTRIBUTE_REMOVE:
938 case ATTRIBUTE_RENAME:
939 return reload_current_mood();
940 /* changes to the aft only require to re-examine the audio file */
942 struct afsi_change_event_data *aced = data;
943 return mood_update_audio_file(aced->aft_row, aced->old_afsi);
946 case AUDIO_FILE_RENAME:
948 return mood_update_audio_file(data, NULL);
949 case AUDIO_FILE_REMOVE:
950 return mood_delete_audio_file(data);