2 * Copyright (C) 2007 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. */
17 * Contains statistical data of the currently admissible audio files.
19 * It is used to assign normalized score values to each admissbile audio file.
21 struct afs_statistics {
22 /** sum of num played over all admissible files */
23 int64_t num_played_sum;
24 /** sum of last played times over all admissible files */
25 int64_t last_played_sum;
26 /** quadratic deviation of num played time */
27 int64_t num_played_qd;
28 /** quadratic deviation of last played time */
29 int64_t last_played_qd;
30 /** number of admissible files */
33 struct afs_statistics statistics;
36 * Assign scores according to a mood_method.
38 * Each mood_method has its own mood_score_function. The first parameter passed
39 * to that function is a pointer to a row of the audio file table. It
40 * determines the audio file for which a score is to be assigned. The second
41 * argument depends on the mood method this function is used for. It usually is
42 * the argument given at the end of a mood line.
44 * Mood score functions must return values between -100 and +100 inclisively.
45 * Boolean score functions should always return either -100 or +100.
47 * \sa struct mood_method, mood_parser.
49 typedef int mood_score_function(const struct osl_row*, void *);
52 * Preprocess a mood line.
54 * The mood_parser of a mood_method is called once at mood open time for each
55 * line of the current mood definition that contains the mood_method's name as
56 * a keyword. The line is passed to the mood_parser as the first argument. The
57 * mood_parser must determine whether the line is syntactically correct and
58 * return a positive value if so and a negative value otherwise.
60 * Some mood parsers preprocess the data given in the mood line to compute a
61 * structure which depends of the particular mood_method and which is used
62 * later in the mood_score_function of the mood_method. The mood_parser may
63 * store a pointer to its structure via the second argument.
65 * \sa mood_open(), mood_cleanup_function, mood_score_function.
67 typedef int mood_parser(const char *, void **);
70 * Deallocate resources which were allocated by the mood_parser.
72 * This optional function of a mood_method is used to free any resources
73 * allocated in mood_open() by the mood_parser. The argument passed is a
74 * pointer to the mood_method specific data structure that was returned by the
79 typedef void mood_cleanup_function(void *);
82 * Used for scoring and to determine whether a file is admissible.
85 /* The name of the method. */
87 /** Pointer to the mood parser. */
89 /** Pointer to the score function */
90 mood_score_function *score_function;
91 /** Optional cleanup function. */
92 mood_cleanup_function *cleanup;
96 * Each line of the current mood corresponds to a mood_item.
99 /** The method this line is referring to. */
100 const struct mood_method *method;
101 /** The data structure computed by the mood parser. */
103 /** The given score value, or zero if none was given. */
105 /** Non-zero if random scoring was requested. */
107 /** Whether the "not" keyword was given in the mood line. */
109 /** The position in the list of items. */
110 struct list_head mood_item_node;
114 * Created from the mood definition by mood_open().
116 * When a mood is opened, each line of its definition is investigated, and a
117 * corresponding mood item is produced. Each mood line starts with \p accept,
118 * \p deny, or \p score which determins the type of the mood line. For each
119 * such type a linked list is maintained whose entries are the mood items.
121 * \sa mood_item, mood_open().
124 /** the name of this mood */
126 /** The list of mood items of type \p accept. */
127 struct list_head accept_list;
128 /** The list of mood items of type \p deny. */
129 struct list_head deny_list;
130 /** The list of mood items of type \p score. */
131 struct list_head score_list;
134 static struct mood *current_mood;
137 * Rough approximation to sqrt.
139 * \param x Integer of which to calculate the sqrt.
141 * \return An integer res with res * res <= x.
143 static uint64_t int_sqrt(uint64_t x)
145 uint64_t op, res, one = 1;
154 if (op >= res + one) {
155 op = op - (res + one);
161 // PARA_NOTICE_LOG("sqrt(%llu) = %llu\n", x, res);
165 static int mm_played_rarely_score_function(const struct osl_row *row,
166 __a_unused void *ignored)
168 struct afs_info afsi;
170 int ret = get_afsi_of_row(row, &afsi);
174 ret = get_num_admissible_files(&num);
177 if (statistics.num_played_sum - num * afsi.num_played
178 > int_sqrt(statistics.num_played_qd * num))
183 static int mm_played_rarely_parser(const char *arg, __a_unused void **ignored)
186 PARA_WARNING_LOG("ignored junk at eol: %s\n", arg);
190 static int mm_name_like_score_function(const struct osl_row *row, void *preg)
193 int ret = get_audio_file_path_of_row(row, &path);
197 ret = regexec((regex_t *)preg, path, 42, NULL, 0);
198 return (ret == REG_NOMATCH)? -100 : 100;
201 static int mm_name_like_parser(const char *arg, void **regex)
203 regex_t *preg = para_malloc(sizeof(*preg));
204 int ret = regcomp(preg, arg, REG_NOSUB);
208 return -E_MOOD_REGEX;
214 static void mm_name_like_cleanup(void *preg)
220 static int mm_is_set_parser(const char *arg, void **bitnum)
222 unsigned char *c = para_malloc(1);
223 int ret = get_attribute_bitnum_by_name(arg, c);
232 static int mm_is_set_score_function(const struct osl_row *row, void *bitnum)
234 unsigned char *bn = bitnum;
235 struct afs_info afsi;
236 int ret = get_afsi_of_row(row, &afsi);
240 if (afsi.attributes & (1ULL << *bn))
245 /* returns 1 if row matches score item, -1 otherwise */
246 static int add_item_score(const struct osl_row *row, struct mood_item *item, long *score,
251 *score_arg_sum += item->random_score? 100 : PARA_ABS(item->score_arg);
253 ret = item->method->score_function(row, item->parser_data);
254 if ((ret < 0 && !item->logical_not) || (ret >= 0 && item->logical_not))
255 return -1; /* no match */
257 if (item->random_score)
258 *score += PARA_ABS(ret) * para_random(100);
260 *score += PARA_ABS(ret) * item->score_arg;
264 static int compute_mood_score(const struct osl_row *row, long *result)
266 struct mood_item *item;
268 long score_arg_sum = 0, score = 0;
272 /* reject audio file if it matches any entry in the deny list */
273 list_for_each_entry(item, ¤t_mood->deny_list, mood_item_node)
274 if (add_item_score(row, item, &score, &score_arg_sum) > 0)
275 return -E_NOT_ADMISSIBLE;
276 list_for_each_entry(item, ¤t_mood->accept_list, mood_item_node)
277 if (add_item_score(row, item, &score, &score_arg_sum) > 0)
279 /* reject if there is no matching entry in the accept list */
280 if (!match && !list_empty(¤t_mood->accept_list))
281 return -E_NOT_ADMISSIBLE;
282 list_for_each_entry(item, ¤t_mood->score_list, mood_item_node)
283 add_item_score(row, item, &score, &score_arg_sum);
285 score /= score_arg_sum;
290 static const struct mood_method mood_methods[] = {
292 .parser = mm_played_rarely_parser,
293 .score_function = mm_played_rarely_score_function,
294 .name = "played_rarely"
297 .parser = mm_is_set_parser,
298 .score_function = mm_is_set_score_function,
302 .parser = mm_name_like_parser,
303 .score_function = mm_name_like_score_function,
304 .cleanup = mm_name_like_cleanup,
312 static void cleanup_list_entry(struct mood_item *item)
314 if (item->method && item->method->cleanup)
315 item->method->cleanup(item->parser_data);
317 free(item->parser_data);
318 list_del(&item->mood_item_node);
322 static void destroy_mood(struct mood *m)
324 struct mood_item *tmp, *item;
328 list_for_each_entry_safe(item, tmp, &m->accept_list, mood_item_node)
329 cleanup_list_entry(item);
330 list_for_each_entry_safe(item, tmp, &m->deny_list, mood_item_node)
331 cleanup_list_entry(item);
332 list_for_each_entry_safe(item, tmp, &m->score_list, mood_item_node)
333 cleanup_list_entry(item);
338 static struct mood *alloc_new_mood(const char *name)
340 struct mood *m = para_calloc(sizeof(struct mood));
341 m->name = para_strdup(name);
342 INIT_LIST_HEAD(&m->accept_list);
343 INIT_LIST_HEAD(&m->deny_list);
344 INIT_LIST_HEAD(&m->score_list);
348 /** The different types of a mood line. */
349 enum mood_line_type {
361 * <accept [with score <score>] | deny [with score <score>] | score <score>>
362 * [if] [not] <mood_method> [options]
363 * <score> is either an integer or "random" which assigns a random score to
367 /* TODO: Use current_mood as private_data*/
368 static int parse_mood_line(char *mood_line, __a_unused void *private_data)
375 enum mood_line_type mlt = ML_INVALID;
376 struct mood_item *mi = NULL;
377 struct mood *m = current_mood;
378 char *buf = para_strdup(mood_line);
380 num_words = split_args(buf, &argv, delim);
382 if (!num_words) /* empty line */
385 if (**w == '#') /* comment */
387 if (!strcmp(*w, "accept"))
389 else if (!strcmp(*w, "deny"))
391 else if (!strcmp(*w, "score"))
393 ret = -E_MOOD_SYNTAX;
394 if (mlt == ML_INVALID)
396 mi = para_calloc(sizeof(struct mood_item));
397 if (mlt != ML_SCORE) {
398 ret = -E_MOOD_SYNTAX;
402 if (!strcmp(*w, "with")) {
408 if (mlt == ML_SCORE || !strcmp(*w, "score")) {
409 ret = -E_MOOD_SYNTAX;
413 if (strcmp(*w, "random")) {
414 mi->random_score = 0;
415 ret = para_atol(*w, &mi->score_arg);
419 mi->random_score = 1;
421 goto success; /* the line "score random" is valid */
425 ret = -E_MOOD_SYNTAX;
429 if (!strcmp(*w, "if")) {
430 ret = -E_MOOD_SYNTAX;
435 if (!strcmp(*w, "not")) {
436 ret = -E_MOOD_SYNTAX;
443 for (i = 0; mood_methods[i].parser; i++) {
444 if (strcmp(*w, mood_methods[i].name))
448 ret = -E_MOOD_SYNTAX;
449 if (!mood_methods[i].parser)
452 ret = mood_methods[i].parser(*w, &mi->parser_data);
455 mi->method = &mood_methods[i];
457 if (mlt == ML_ACCEPT)
458 para_list_add(&mi->mood_item_node, &m->accept_list);
459 else if (mlt == ML_DENY)
460 para_list_add(&mi->mood_item_node, &m->deny_list);
462 para_list_add(&mi->mood_item_node, &m->score_list);
463 PARA_DEBUG_LOG("%s entry added, method: %p\n", mlt == ML_ACCEPT? "accept" :
464 (mlt == ML_DENY? "deny" : "score"), mi->method);
472 free(mi->parser_data);
478 static int load_mood(const struct osl_row *row)
481 struct mood *new_mood, *old_mood = current_mood;
482 struct osl_object objs[NUM_BLOB_COLUMNS];
484 ret = osl_get_object(moods_table, row, BLOBCOL_NAME, &objs[BLOBCOL_NAME]);
487 if (objs[BLOBCOL_NAME].size <= 1)
489 ret = osl_open_disk_object(moods_table, row, BLOBCOL_DEF, &objs[BLOBCOL_DEF]);
492 new_mood = alloc_new_mood((char*)objs[BLOBCOL_NAME].data);
493 current_mood = new_mood;
494 ret = for_each_line_ro(objs[BLOBCOL_DEF].data, objs[BLOBCOL_DEF].size,
495 parse_mood_line, NULL);
496 osl_close_disk_object(&objs[BLOBCOL_DEF]);
498 PARA_ERROR_LOG("unable to load mood %s: %d\n",
499 (char *)objs[BLOBCOL_NAME].data, ret);
500 destroy_mood(new_mood);
501 current_mood = old_mood;
504 destroy_mood(old_mood);
505 current_mood = new_mood;
506 PARA_INFO_LOG("loaded mood %s\n", current_mood->name);
510 /* returns -E_MOOD_LOADED on _success_ to terminate the loop */
511 static int mood_loop(struct osl_row *row, __a_unused void *private_data)
513 int ret = load_mood(row);
515 if (ret != -E_DUMMY_ROW)
516 PARA_NOTICE_LOG("invalid mood (%d), trying next mood\n", ret);
519 return -E_MOOD_LOADED;
522 static int load_first_available_mood(void)
524 int ret = osl_rbtree_loop(moods_table, BLOBCOL_NAME, NULL,
526 if (ret == -E_MOOD_LOADED) /* success */
529 return ret; /* error */
530 PARA_NOTICE_LOG("no valid mood found\n");
535 static unsigned int_log2(uint64_t x)
547 static int64_t normalized_value(int64_t x, int64_t n, int64_t sum, int64_t qd)
551 return 100 * (n * x - sum) / (int64_t)int_sqrt(n * qd);
554 static long compute_num_played_score(struct afs_info *afsi)
556 return -normalized_value(afsi->num_played, statistics.num,
557 statistics.num_played_sum, statistics.num_played_qd);
560 static long compute_last_played_score(struct afs_info *afsi)
562 return -normalized_value(afsi->last_played, statistics.num,
563 statistics.last_played_sum, statistics.last_played_qd);
566 static long compute_dynamic_score(const struct osl_row *aft_row)
568 struct afs_info afsi;
569 int64_t score, nscore = 0, lscore = 0;
572 ret = get_afsi_of_row(aft_row, &afsi);
575 nscore = compute_num_played_score(&afsi);
576 lscore = compute_last_played_score(&afsi);
577 score = nscore + lscore;
581 static int add_afs_statistics(const struct osl_row *row)
584 struct afs_info afsi;
587 ret = get_afsi_of_row(row, &afsi);
591 x = afsi.last_played;
592 s = statistics.last_played_sum;
594 statistics.last_played_qd += (x - s / n) * (x - s / n) * n / (n + 1);
595 statistics.last_played_sum += x;
598 s = statistics.num_played_sum;
600 statistics.num_played_qd += (x - s / n) * (x - s / n) * n / (n + 1);
601 statistics.num_played_sum += x;
606 static int del_afs_statistics(const struct osl_row *row)
608 uint64_t n, s, q, a, new_s;
609 struct afs_info afsi;
611 ret = get_afsi_of_row(row, &afsi);
617 memset(&statistics, 0, sizeof(statistics));
621 s = statistics.last_played_sum;
622 q = statistics.last_played_qd;
623 a = afsi.last_played;
625 statistics.last_played_sum = new_s;
626 statistics.last_played_qd = q + s * s / n - a * a
627 - new_s * new_s / (n - 1);
629 s = statistics.num_played_sum;
630 q = statistics.num_played_qd;
633 statistics.num_played_sum = new_s;
634 statistics.num_played_qd = q + s * s / n - a * a
635 - new_s * new_s / (n - 1);
642 * Structure used during mood_open().
644 * At mood open time, we look at each file in the audio file table in order to
645 * determine whether it is admissible. If a file happens to be admissible, its
646 * mood score is computed by calling each relevant mood_score_function. Next,
647 * we update the afs_statistics and add a struct admissible_file_info to a
650 * If all files have been processed that way, the final score of each
651 * admissible file is computed by adding the dynamic score (which depends on
652 * the afs_statistics) to the mood score. Finally, all audio files in the
653 * array are added to the score table and the admissible array is freed.
655 * \sa mood_method, admissible_array.
657 struct admissible_file_info
659 /** The admissible audio file. */
660 struct osl_row *aft_row;
665 /** The temporary array of admissible files. */
666 struct admissible_array {
667 /** The size of the array */
669 /** Pointer to the array of admissible files. */
670 struct admissible_file_info *array;
674 * Add an entry to the array of admissible files.
676 * \param aft_row The audio file to be added.
677 * \param private_data Pointer to a struct admissible_file_info.
679 * \return Negative on errors, positive on success.
681 static int add_if_admissible(struct osl_row *aft_row, void *private_data)
684 struct admissible_array *aa = private_data;
688 ret = compute_mood_score(aft_row, &score);
690 return (ret == -E_NOT_ADMISSIBLE)? 1 : ret;
691 if (statistics.num >= aa->size) {
694 aa->array = para_realloc(aa->array,
695 aa->size * sizeof(struct admissible_file_info));
697 aa->array[statistics.num].aft_row = aft_row;
698 aa->array[statistics.num].score = score;
699 ret = add_afs_statistics(aft_row);
706 * Compute the new quadratic deviation in case one element changes.
708 * \param n Number of elements.
709 * \param old_qd The quadratic deviation before the change.
710 * \param old_val The value that was repaced.
711 * \param new_val The replacement value.
712 * \param old_sum The sum of all elements before the update.
714 * \return The new quadratic deviation resulting from replacing old_val
717 * Given n real numbers a_1, ..., a_n, their sum S = a_1 + ... + a_n,
718 * their quadratic deviation
720 * q = (a_1 - S/n)^2 + ... + (a_n - S/n)^2,
722 * and a real number b, the quadratic deviation q' of a_1,...a_{n-1}, b (ie.
723 * the last number a_n was replaced by b) may be computed in O(1) time in terms
724 * of n, q, a_n, b, and S as
726 * q' = q + d * s - (2 * S + d) * d / n,
728 * where d = b - a_n, and s = b + a_n.
730 * Example: n = 3, a_1 = 3, a_2 = 5, a_3 = 7, b = 10. Then S = 15, q = 8, d = 3,
733 * q + d * s - (2 * S + d) * d / n = 8 + 51 - 33 = 26,
735 * which equals q' = (3 - 6)^2 + (5 - 6)^2 + (10 - 6)^2.
738 _static_inline_ int64_t update_quadratic_deviation(int64_t n, int64_t old_qd,
739 int64_t old_val, int64_t new_val, int64_t old_sum)
741 int64_t delta = new_val - old_val;
742 int64_t sigma = new_val + old_val;
743 return old_qd + delta * sigma - (2 * old_sum + delta) * delta / n;
746 static int update_afs_statistics(struct afs_info *old_afsi, struct afs_info *new_afsi)
749 int ret = get_num_admissible_files(&n);
755 statistics.last_played_qd = update_quadratic_deviation(n,
756 statistics.last_played_qd, old_afsi->last_played,
757 new_afsi->last_played, statistics.last_played_sum);
758 statistics.last_played_sum += new_afsi->last_played - old_afsi->last_played;
760 statistics.num_played_qd = update_quadratic_deviation(n,
761 statistics.num_played_qd, old_afsi->num_played,
762 new_afsi->num_played, statistics.num_played_sum);
763 statistics.num_played_sum += new_afsi->num_played - old_afsi->num_played;
767 static int add_to_score_table(const struct osl_row *aft_row, long mood_score)
769 long score = (compute_dynamic_score(aft_row) + mood_score) / 3;
770 return score_add(aft_row, score);
773 static int delete_from_statistics_and_score_table(const struct osl_row *aft_row)
775 int ret = del_afs_statistics(aft_row);
778 return score_delete(aft_row);
782 * Delete one entry from the statitics and from the score table.
784 * \param aft_row The audio file which is no longer admissible.
786 * \return Positive on success, negative on errors.
788 * \sa score_delete(), mood_update_audio_file().
790 int mood_delete_audio_file(const struct osl_row *aft_row)
794 ret = row_belongs_to_score_table(aft_row);
797 if (!ret) /* not admissible, nothing to do */
799 return delete_from_statistics_and_score_table(aft_row);
803 * Compute the new score of an audio file.
805 * \param aft_row Determines the audio file.
806 * \param old_afsi The audio file selector info before updating.
808 * The \a old_afsi argument may be \p NULL which indicates that no changes to
809 * the audio file info were made.
811 * \return Positive on success, negative on errors.
813 int mood_update_audio_file(const struct osl_row *aft_row, struct afs_info *old_afsi)
816 int ret, is_admissible, was_admissible = 0;
817 struct afs_info afsi;
820 return 1; /* nothing to do */
821 ret = row_belongs_to_score_table(aft_row);
824 was_admissible = ret;
825 ret = compute_mood_score(aft_row, &score);
826 is_admissible = (ret > 0);
827 if (!was_admissible && !is_admissible)
829 if (was_admissible && !is_admissible)
830 return delete_from_statistics_and_score_table(aft_row);
831 if (!was_admissible && is_admissible) {
832 ret = add_afs_statistics(aft_row);
835 return add_to_score_table(aft_row, score);
838 ret = get_afsi_of_row(aft_row, &afsi);
842 ret = update_afs_statistics(old_afsi, &afsi);
846 score += compute_num_played_score(&afsi);
847 score += compute_last_played_score(&afsi);
849 PARA_DEBUG_LOG("score: %li\n", score);
850 percent = (score + 100) / 3;
853 else if (percent < 0)
855 PARA_DEBUG_LOG("re-inserting at %lu%%\n", percent);
856 return score_update(aft_row, percent);
859 static void log_statistics(void)
861 unsigned n = statistics.num;
864 PARA_NOTICE_LOG("no admissible files\n");
867 PARA_NOTICE_LOG("last_played mean: %lli, last_played sigma: %llu\n",
868 (long long int)(statistics.last_played_sum / n),
869 (long long unsigned)int_sqrt(statistics.last_played_qd / n));
870 PARA_NOTICE_LOG("num_played mean: %lli, num_played sigma: %llu\n",
871 (long long int)statistics.num_played_sum / n,
872 (long long unsigned)int_sqrt(statistics.num_played_qd / n));
876 * Open the given mood.
878 * \param mood_name The name of the mood to open.
880 * There are two special cases: If \a mood_name is \a NULL, load the
881 * first available mood. If \a mood_name is the empty string "", load
882 * the dummy mood that accepts every audio file and uses a scoring method
883 * based only on the \a last_played information.
885 * \return Positive on success, negative on errors. Loading the dummy mood
888 * \sa struct admissible_file_info, struct admissible_array, struct
889 * afs_info::last_played, mood_close().
891 int mood_open(char *mood_name)
894 struct admissible_array aa = {
900 ret = load_first_available_mood();
903 } else if (*mood_name) {
905 struct osl_object obj = {
907 .size = strlen(mood_name) + 1
909 ret = osl_get_row(moods_table, BLOBCOL_NAME, &obj, &row);
911 PARA_NOTICE_LOG("no such mood: %s\n", mood_name);
914 ret = load_mood(row);
918 destroy_mood(current_mood);
919 current_mood = alloc_new_mood("dummy");
921 PARA_NOTICE_LOG("loaded mood %s\n", current_mood->name);
922 PARA_INFO_LOG("%s\n", "computing statistics of admissible files");
923 ret = audio_file_loop(&aa, add_if_admissible);
927 PARA_NOTICE_LOG("%d admissible files \n", statistics.num);
928 for (i = 0; i < statistics.num; i++) {
929 struct admissible_file_info *a = aa.array + i;
930 ret = add_to_score_table(a->aft_row, a->score);
934 PARA_NOTICE_LOG("score add complete\n");
942 * Close the current mood.
944 * Free all resources of the current mood which were allocated during
947 void mood_close(void)
949 destroy_mood(current_mood);
951 memset(&statistics, 0, sizeof(statistics));
955 * Close and re-open the current mood.
957 * This function is used if changes to the audio file table or the
958 * attribute table were made that render the current list of admissible
959 * files useless. For example, if an attribute is removed from the
960 * attribute table, this function is called.
962 * \return Positive on success, negative on errors. If no mood is currently
963 * open, the function returns success.
965 * \sa mood_open(), mood_close().
967 int mood_reload(void)
975 mood_name = para_strdup(current_mood->name);
977 ret = mood_open(mood_name);