afs.h

   1 /*
   2  * Copyright (C) 2007-2008 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file afs.h Exported symbols of the audio file selector. */
   8
   9 #include <regex.h>
  10 #include "osl.h"
  11 #include "hash.h"
  12
  13 /** Audio file selector data stored in the audio file table. */
  14 struct afs_info {
  15         /** Seconds since the epoch. */
  16         uint64_t last_played;
  17         /** Bit field of set attributes. */
  18         uint64_t attributes;
  19         /** Counts how many times the file was selected. */
  20         uint32_t num_played;
  21         /** Image blob associated with this file (foreign key). */
  22         uint32_t image_id;
  23         /** Lyrics blob associated with this file (foreign key). */
  24         uint32_t lyrics_id;
  25         /** Mp3, ogg or aac. */
  26         uint8_t audio_format_id;
  27 };
  28
  29 /**
  30  * Events caused by changes to an afs table.
  31  *
  32  * Whenever an afs table changes, an event is generated which causes afs to
  33  * call the event handlers of all other tables. For example, if an audio file
  34  * is added, the event handler of the mood table checks the new file for
  35  * admissibility.
  36  */
  37 enum afs_events {
  38         /** An attribute was added. */
  39         ATTRIBUTE_ADD,
  40         /** An attribute was renamed. */
  41         ATTRIBUTE_RENAME,
  42         /** An attribute was removed. */
  43         ATTRIBUTE_REMOVE,
  44         /** The afs info struct of an audio file changed. */
  45         AFSI_CHANGE,
  46         /** The afh info struct of an audio file changed. */
  47         AFHI_CHANGE,
  48         /** An audio file was renamed. */
  49         AUDIO_FILE_RENAME,
  50         /** An audio file was added. */
  51         AUDIO_FILE_ADD,
  52         /** An audio file is about to be removed. */
  53         AUDIO_FILE_REMOVE,
  54         /** A new blob was added. */
  55         BLOB_ADD,
  56         /** A blob was renamed. */
  57         BLOB_RENAME,
  58         /** A blob is about to be removed. */
  59         BLOB_REMOVE,
  60 };
  61
  62 struct rmatt_event_data {
  63         const char *name;
  64         unsigned char bitnum;
  65 };
  66
  67
  68 struct afsi_change_event_data {
  69         struct osl_row *aft_row;
  70         struct afs_info *old_afsi;
  71 };
  72
  73 /** Function pointers for table handling.  */
  74 struct afs_table {
  75         /** Initializes the other pointers in this struct. */
  76         void (*init)(struct afs_table *t);
  77         /** The name of this table. */
  78         const char *name;
  79         /** Gets called on startup and on \p SIGHUP. */
  80         int (*open)(const char *base_dir);
  81         /** Gets called on shutdown and on \p SIGHUP. */
  82         void (*close)(void);
  83         /** Called by the \a init afs command. */
  84         int (*create)(const char *);
  85         /** Handles afs events. */
  86         int (*event_handler)(enum afs_events event, struct para_buffer *pb,
  87                 void *data);
  88         /* int *(check)() */
  89 };
  90
  91 enum play_mode {PLAY_MODE_MOOD, PLAY_MODE_PLAYLIST};
  92
  93 /**
  94  * Data about one audio file.
  95  *
  96  * Needed to produce ls and stat output.
  97  */
  98 struct ls_data {
  99         /** Usual audio format handler information. */
 100         struct afh_info afhi;
 101         /** Audio file selector information. */
 102         struct afs_info afsi;
 103         /** The full path of the audio file. */
 104         char *path;
 105         /** The score value (if -a was given). */
 106         long score;
 107         /** The sha1 hash of audio file. */
 108         HASH_TYPE *hash;
 109 };
 110 int make_status_items(struct ls_data *d, struct para_buffer *pb);
 111 void make_empty_status_items(char *buf);
 112
 113 /** At most that many bytes will be passed from afs to para_server. */
 114 #define VERBOSE_LS_OUTPUT_SIZE 4096
 115
 116 /** Data about the current audio file, passed from afs to server. */
 117 struct audio_file_data {
 118         /** Same info as ls -lv -p current audio_file. */
 119         char verbose_ls_output[VERBOSE_LS_OUTPUT_SIZE];
 120         /** The open file descriptor to the current audio file. */
 121         int fd;
 122         /** Vss needs this for streaming. */
 123         struct afh_info afhi;
 124 };
 125
 126 enum afs_server_code {
 127         NEXT_AUDIO_FILE,
 128         NO_ADMISSIBLE_FILES,
 129         AFD_CHANGE
 130 };
 131
 132 /** Flags passed to for_each_matching_row(). */
 133 enum pattern_match_flags {
 134         /** Loop in reverse order. */
 135         PM_REVERSE_LOOP = 1,
 136         /** If no pattern is given, loop over all rows. */
 137         PM_NO_PATTERN_MATCHES_EVERYTHING = 2,
 138         /** If the data in match_column is the empty string, skip this row. */
 139         PM_SKIP_EMPTY_NAME = 4,
 140 };
 141
 142 /** Structure passed to for_each_matching_row(). */
 143 struct pattern_match_data {
 144         /** Loop over all rows in this table. */
 145         struct osl_table *table;
 146         /** Determines the loop order. Must be an rbtree column. */
 147         unsigned loop_col_num;
 148         /** Data from this column is matched against the given patterns. */
 149         unsigned match_col_num;
 150         /** \see pattern_match_flags. */
 151         unsigned pm_flags;
 152         /** This value is passed verbatim to fnmatch(). */
 153         int fnmatch_flags;
 154         /** Null-terminated array of patterns. */
 155         struct osl_object patterns;
 156         /** Data pointer passed to the action function. */
 157         void *data;
 158         /** For each matching row, this function will be called. */
 159         int (*action)(struct osl_table *table, struct osl_row *row, const char *name, void *data);
 160 };
 161
 162 /* afs */
 163 /**
 164  * Afs command handlers run as a process which is not related to the afs
 165  * process, i.e. they can not change the address space of afs directly.
 166  * Therefore afs commands typically consist of two functions: The command
 167  * handler and the corresponding callback function that runs in afs context.
 168  *
 169  * \sa send_callback_request().
 170  */
 171 typedef int callback_function(const struct osl_object *, struct osl_object *);
 172 __noreturn void afs_init(uint32_t cookie, int socket_fd);
 173 void afs_event(enum afs_events event, struct para_buffer *pb,
 174         void *data);
 175 int send_callback_request(callback_function *f, struct osl_object *query,
 176         struct osl_object *result);
 177 int send_standard_callback_request(int argc, char * const * const argv,
 178                 callback_function *f, struct osl_object *result);
 179 int send_option_arg_callback_request(struct osl_object *options,
 180         int argc, char * const * const argv, callback_function *f,
 181         struct osl_object *result);
 182 int stdin_command(int fd, struct osl_object *arg_obj, callback_function *f,
 183                 unsigned max_len, struct osl_object *result);
 184 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2);
 185 int for_each_matching_row(struct pattern_match_data *pmd);
 186
 187 /* score */
 188 void score_init(struct afs_table *t);
 189 int admissible_file_loop(void *data, osl_rbtree_loop_func *func);
 190 int admissible_file_loop_reverse(void *data, osl_rbtree_loop_func *func);
 191 int score_get_best(struct osl_row **aft_row, long *score);
 192 int get_score_and_aft_row(struct osl_row *score_row, long *score, struct osl_row **aft_row);
 193 int score_add(const struct osl_row *row, long score);
 194 int score_update(const struct osl_row *aft_row, long new_score);
 195 int get_num_admissible_files(unsigned *num);
 196 int score_delete(const struct osl_row *aft_row);
 197 int clear_score_table(void);
 198 int row_belongs_to_score_table(const struct osl_row *aft_row, unsigned *rank);
 199
 200 /* attribute */
 201 void attribute_init(struct afs_table *t);
 202 void get_attribute_bitmap(const uint64_t *atts, char *buf); /* needed by com_ls() */
 203 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum);
 204 int get_attribute_text(uint64_t *atts, const char *delim, char **text);
 205
 206 /* aft */
 207 void aft_init(struct afs_table *t);
 208 int aft_get_row_of_path(const char *path, struct osl_row **row);
 209 int open_and_update_audio_file(struct osl_row *aft_row, long score,
 210         struct audio_file_data *afd);
 211 int load_afd(int shmid, struct audio_file_data *afd);
 212 int load_afsi(struct afs_info *afsi, struct osl_object *obj);
 213 void save_afsi(struct afs_info *afsi, struct osl_object *obj);
 214 int get_afsi_of_row(const struct osl_row *row, struct afs_info *afsi);
 215 int get_afhi_of_row(const struct osl_row *row, struct afh_info *afhi);
 216 int get_afsi_of_path(const char *path, struct afs_info *afsi);
 217 int get_audio_file_path_of_row(const struct osl_row *row, char **path);
 218 int get_afsi_object_of_row(const struct osl_row *row, struct osl_object *obj);
 219 int audio_file_loop(void *private_data, osl_rbtree_loop_func *func);
 220 int aft_check_callback(const struct osl_object *query, struct osl_object *result);
 221
 222 /* mood */
 223 int change_current_mood(char *mood_name);
 224 void close_current_mood(void);
 225 int reload_current_mood(void);
 226 int mood_check_callback(__a_unused const struct osl_object *query,
 227         struct osl_object *result);
 228
 229
 230 /* playlist */
 231 int playlist_open(char *name);
 232 void playlist_close(void);
 233 int playlist_check_callback(__a_unused const struct osl_object *query,
 234         struct osl_object *result);
 235
 236 /** evaluates to 1 if x < y, to -1 if x > y and to 0 if x == y */
 237 #define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
 238
 239
 240 /** Define exported functions and a table pointer for an osl blob table. */
 241 #define DECLARE_BLOB_SYMBOLS(table_name, cmd_prefix) \
 242         void table_name ## _init(struct afs_table *t); \
 243         int cmd_prefix ## _get_name_by_id(uint32_t id, char **name); \
 244         int cmd_prefix ## _get_def_by_id(uint32_t id, struct osl_object *def); \
 245         int cmd_prefix ## _get_def_by_name(char *name, struct osl_object *def); \
 246         int cmd_prefix ## _get_name_and_def_by_row(const struct osl_row *row, \
 247                 char **name, struct osl_object *def); \
 248         int table_name ##_event_handler(enum afs_events event, \
 249                 struct para_buffer *pb, void *data); \
 250         extern struct osl_table *table_name ## _table;
 251
 252 DECLARE_BLOB_SYMBOLS(lyrics, lyr);
 253 DECLARE_BLOB_SYMBOLS(images, img);
 254 DECLARE_BLOB_SYMBOLS(moods, mood);
 255 DECLARE_BLOB_SYMBOLS(playlists, pl);
 256
 257 /** The columns of an abstract blob table. */
 258 enum blob_table_columns {
 259         /** The identifier, a positive integer that never repeats. */
 260         BLOBCOL_ID,
 261         /** The unique name of the blob. */
 262         BLOBCOL_NAME,
 263         /** The actual blob contents. */
 264         BLOBCOL_DEF,
 265         /** A blob table has that many columns. */
 266         NUM_BLOB_COLUMNS
 267 };
 268
 269 /** Define an osl table description for a blob table. */
 270 #define DEFINE_BLOB_TABLE_DESC(table_name) \
 271         struct osl_table_description table_name ## _table_desc = { \
 272                 .name = #table_name, \
 273                 .num_columns = NUM_BLOB_COLUMNS, \
 274                 .flags = OSL_LARGE_TABLE, \
 275                 .column_descriptions = blob_cols \
 276         };
 277
 278 /** Define a pointer to an osl blob table with a canonical name. */
 279 #define DEFINE_BLOB_TABLE_PTR(table_name) struct osl_table *table_name ## _table;
 280
 281 /** Define a blob table. */
 282 #define INIT_BLOB_TABLE(table_name) \
 283         DEFINE_BLOB_TABLE_DESC(table_name); \
 284         DEFINE_BLOB_TABLE_PTR(table_name);
 285