afs.h

   1 /*
   2  * Copyright (C) 2007-2009 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         /** Amplification value. */
  28         uint8_t amp;
  29 };
  30
  31 /**
  32  * Events caused by changes to an afs table.
  33  *
  34  * Whenever an afs table changes, an event is generated which causes afs to
  35  * call the event handlers of all other tables. For example, if an audio file
  36  * is added, the event handler of the mood table checks the new file for
  37  * admissibility.
  38  */
  39 enum afs_events {
  40         /** An attribute was added. */
  41         ATTRIBUTE_ADD,
  42         /** An attribute was renamed. */
  43         ATTRIBUTE_RENAME,
  44         /** An attribute was removed. */
  45         ATTRIBUTE_REMOVE,
  46         /** The afs info struct of an audio file changed. */
  47         AFSI_CHANGE,
  48         /** The afh info struct of an audio file changed. */
  49         AFHI_CHANGE,
  50         /** An audio file was renamed. */
  51         AUDIO_FILE_RENAME,
  52         /** An audio file was added. */
  53         AUDIO_FILE_ADD,
  54         /** An audio file is about to be removed. */
  55         AUDIO_FILE_REMOVE,
  56         /** A new blob was added. */
  57         BLOB_ADD,
  58         /** A blob was renamed. */
  59         BLOB_RENAME,
  60         /** A blob is about to be removed. */
  61         BLOB_REMOVE,
  62 };
  63
  64 struct rmatt_event_data {
  65         const char *name;
  66         unsigned char bitnum;
  67 };
  68
  69
  70 struct afsi_change_event_data {
  71         struct osl_row *aft_row;
  72         struct afs_info *old_afsi;
  73 };
  74
  75 /** Function pointers for table handling.  */
  76 struct afs_table {
  77         /** Initializes the other pointers in this struct. */
  78         void (*init)(struct afs_table *t);
  79         /** The name of this table. */
  80         const char *name;
  81         /** Gets called on startup and on \p SIGHUP. */
  82         int (*open)(const char *base_dir);
  83         /** Gets called on shutdown and on \p SIGHUP. */
  84         void (*close)(void);
  85         /** Called by the \a init afs command. */
  86         int (*create)(const char *);
  87         /** Handles afs events. */
  88         int (*event_handler)(enum afs_events event, struct para_buffer *pb,
  89                 void *data);
  90 };
  91
  92 enum play_mode {PLAY_MODE_MOOD, PLAY_MODE_PLAYLIST};
  93
  94 /**
  95  * Data about one audio file.
  96  *
  97  * Needed to produce ls and stat output.
  98  */
  99 struct ls_data {
 100         /** Usual audio format handler information. */
 101         struct afh_info afhi;
 102         /** Audio file selector information. */
 103         struct afs_info afsi;
 104         /** The full path of the audio file. */
 105         char *path;
 106         /** The score value (if -a was given). */
 107         long score;
 108         /** The sha1 hash of audio file. */
 109         HASH_TYPE *hash;
 110 };
 111 int make_status_items(struct ls_data *d, struct para_buffer *pb);
 112 void make_empty_status_items(char *buf);
 113
 114 /** At most that many bytes will be passed from afs to para_server. */
 115 #define VERBOSE_LS_OUTPUT_SIZE 4096
 116
 117 /** Data about the current audio file, passed from afs to server. */
 118 struct audio_file_data {
 119         /** Same info as ls -lv -p current audio_file. */
 120         char verbose_ls_output[VERBOSE_LS_OUTPUT_SIZE];
 121         /** The open file descriptor to the current audio file. */
 122         int fd;
 123         /** Vss needs this for streaming. */
 124         struct afh_info afhi;
 125 };
 126
 127 enum afs_server_code {
 128         NEXT_AUDIO_FILE,
 129         NO_ADMISSIBLE_FILES,
 130         AFD_CHANGE
 131 };
 132
 133 /** Flags passed to for_each_matching_row(). */
 134 enum pattern_match_flags {
 135         /** Loop in reverse order. */
 136         PM_REVERSE_LOOP = 1,
 137         /** If no pattern is given, loop over all rows. */
 138         PM_NO_PATTERN_MATCHES_EVERYTHING = 2,
 139         /** If the data in match_column is the empty string, skip this row. */
 140         PM_SKIP_EMPTY_NAME = 4,
 141 };
 142
 143 /** Structure passed to for_each_matching_row(). */
 144 struct pattern_match_data {
 145         /** Loop over all rows in this table. */
 146         struct osl_table *table;
 147         /** Determines the loop order. Must be an rbtree column. */
 148         unsigned loop_col_num;
 149         /** Data from this column is matched against the given patterns. */
 150         unsigned match_col_num;
 151         /** \see pattern_match_flags. */
 152         unsigned pm_flags;
 153         /** This value is passed verbatim to fnmatch(). */
 154         int fnmatch_flags;
 155         /** Null-terminated array of patterns. */
 156         struct osl_object patterns;
 157         /** Data pointer passed to the action function. */
 158         void *data;
 159         /** For each matching row, this function will be called. */
 160         int (*action)(struct osl_table *table, struct osl_row *row, const char *name, void *data);
 161 };
 162
 163
 164 /**
 165  * Afs command handlers run as a process which is not related to the afs
 166  * process, i.e. they can not change the address space of afs directly.
 167  * Therefore afs commands typically consist of two functions: The command
 168  * handler and the corresponding callback function that runs in afs context.
 169  *
 170  * \sa send_callback_request().
 171  */
 172 typedef void callback_function(int fd, const struct osl_object *);
 173
 174 /**
 175  * Callbacks send chunks to data back to the command handler. Pointers to
 176  * this type of function are used by \ref send_callback_request and friends
 177  * to deal with the data in the command handler process.
 178  *
 179  * \sa \ref send_callback_request().
 180  */
 181 typedef int callback_result_handler(struct osl_object *result, void *private);
 182 int send_result(struct osl_object *result, void *fd_ptr);
 183 int pass_buffer_as_shm(char *buf, size_t size, void *fd_ptr);
 184
 185 __noreturn void afs_init(uint32_t cookie, int socket_fd);
 186 void afs_event(enum afs_events event, struct para_buffer *pb,
 187         void *data);
 188 int send_callback_request(callback_function *f, struct osl_object *query,
 189                 callback_result_handler *result_handler,
 190                 void *private_result_data);
 191 int send_option_arg_callback_request(struct osl_object *options,
 192                 int argc,  char * const * const argv, callback_function *f,
 193                 callback_result_handler *result_handler,
 194                 void *private_result_data);
 195 int send_standard_callback_request(int argc,  char * const * const argv,
 196                 callback_function *f, callback_result_handler *result_handler,
 197                 void *private_result_data);
 198 int stdin_command(int fd, struct osl_object *arg_obj, callback_function *f,
 199                 unsigned max_len, callback_result_handler *result_handler,
 200                 void *private_result_data);
 201 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2);
 202 int for_each_matching_row(struct pattern_match_data *pmd);
 203
 204 /* score */
 205 void score_init(struct afs_table *t);
 206 int admissible_file_loop(void *data, osl_rbtree_loop_func *func);
 207 int admissible_file_loop_reverse(void *data, osl_rbtree_loop_func *func);
 208 int score_get_best(struct osl_row **aft_row, long *score);
 209 int get_score_and_aft_row(struct osl_row *score_row, long *score, struct osl_row **aft_row);
 210 int score_add(const struct osl_row *row, long score);
 211 int score_update(const struct osl_row *aft_row, long new_score);
 212 int get_num_admissible_files(unsigned *num);
 213 int score_delete(const struct osl_row *aft_row);
 214 int clear_score_table(void);
 215 int row_belongs_to_score_table(const struct osl_row *aft_row, unsigned *rank);
 216
 217 /* attribute */
 218 void attribute_init(struct afs_table *t);
 219 void get_attribute_bitmap(const uint64_t *atts, char *buf); /* needed by com_ls() */
 220 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum);
 221 int get_attribute_text(uint64_t *atts, const char *delim, char **text);
 222
 223 /* aft */
 224 void aft_init(struct afs_table *t);
 225 int aft_get_row_of_path(const char *path, struct osl_row **row);
 226 int open_and_update_audio_file(struct osl_row *aft_row, long score,
 227         struct audio_file_data *afd);
 228 int load_afd(int shmid, struct audio_file_data *afd);
 229 int load_afsi(struct afs_info *afsi, struct osl_object *obj);
 230 void save_afsi(struct afs_info *afsi, struct osl_object *obj);
 231 int get_afsi_of_row(const struct osl_row *row, struct afs_info *afsi);
 232 int get_afhi_of_row(const struct osl_row *row, struct afh_info *afhi);
 233 int get_afsi_of_path(const char *path, struct afs_info *afsi);
 234 int get_audio_file_path_of_row(const struct osl_row *row, char **path);
 235 int get_afsi_object_of_row(const struct osl_row *row, struct osl_object *obj);
 236 int audio_file_loop(void *private_data, osl_rbtree_loop_func *func);
 237 void aft_check_callback(int fd, __a_unused const struct osl_object *query);
 238
 239 /* mood */
 240 int change_current_mood(char *mood_name);
 241 void close_current_mood(void);
 242 int reload_current_mood(void);
 243 void mood_check_callback(int fd, __a_unused const struct osl_object *query);
 244
 245
 246 /* playlist */
 247 int playlist_open(char *name);
 248 void playlist_close(void);
 249 void playlist_check_callback(int fd, __a_unused const struct osl_object *query);
 250
 251 /** evaluates to 1 if x < y, to -1 if x > y and to 0 if x == y */
 252 #define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
 253
 254
 255 /** Define exported functions and a table pointer for an osl blob table. */
 256 #define DECLARE_BLOB_SYMBOLS(table_name, cmd_prefix) \
 257         void table_name ## _init(struct afs_table *t); \
 258         int cmd_prefix ## _get_name_by_id(uint32_t id, char **name); \
 259         int cmd_prefix ## _get_def_by_id(uint32_t id, struct osl_object *def); \
 260         int cmd_prefix ## _get_def_by_name(char *name, struct osl_object *def); \
 261         int cmd_prefix ## _get_name_and_def_by_row(const struct osl_row *row, \
 262                 char **name, struct osl_object *def); \
 263         int table_name ##_event_handler(enum afs_events event, \
 264                 struct para_buffer *pb, void *data); \
 265         extern struct osl_table *table_name ## _table;
 266
 267 DECLARE_BLOB_SYMBOLS(lyrics, lyr);
 268 DECLARE_BLOB_SYMBOLS(images, img);
 269 DECLARE_BLOB_SYMBOLS(moods, mood);
 270 DECLARE_BLOB_SYMBOLS(playlists, pl);
 271
 272 /** The columns of an abstract blob table. */
 273 enum blob_table_columns {
 274         /** The identifier, a positive integer that never repeats. */
 275         BLOBCOL_ID,
 276         /** The unique name of the blob. */
 277         BLOBCOL_NAME,
 278         /** The actual blob contents. */
 279         BLOBCOL_DEF,
 280         /** A blob table has that many columns. */
 281         NUM_BLOB_COLUMNS
 282 };
 283
 284 /** Define an osl table description for a blob table. */
 285 #define DEFINE_BLOB_TABLE_DESC(table_name) \
 286         struct osl_table_description table_name ## _table_desc = { \
 287                 .name = #table_name, \
 288                 .num_columns = NUM_BLOB_COLUMNS, \
 289                 .flags = OSL_LARGE_TABLE, \
 290                 .column_descriptions = blob_cols \
 291         };
 292
 293 /** Define a pointer to an osl blob table with a canonical name. */
 294 #define DEFINE_BLOB_TABLE_PTR(table_name) struct osl_table *table_name ## _table;
 295
 296 /** Define a blob table. */
 297 #define INIT_BLOB_TABLE(table_name) \
 298         DEFINE_BLOB_TABLE_DESC(table_name); \
 299         DEFINE_BLOB_TABLE_PTR(table_name);
 300