2 * Copyright (C) 2007-2014 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file afs.h Exported symbols of the audio file selector. */
11 /** Audio file selector data stored in the audio file table. */
13 /** Seconds since the epoch. */
15 /** Bit field of set attributes. */
17 /** Counts how many times the file was selected. */
19 /** Image blob associated with this file (foreign key). */
21 /** Lyrics blob associated with this file (foreign key). */
24 uint8_t audio_format_id;
25 /** Amplification value. */
30 * Events caused by changes to an afs table.
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
38 /** An attribute was added. */
40 /** An attribute was renamed. */
42 /** An attribute was removed. */
44 /** The afs info struct of an audio file changed. */
46 /** The afh info struct of an audio file changed. */
48 /** An audio file was renamed. */
50 /** An audio file was added. */
52 /** An audio file is about to be removed. */
54 /** A new blob was added. */
56 /** A blob was renamed. */
58 /** A blob is about to be removed. */
63 * Used as data for \ref afs_event() for events of type \p ATTRIBUTE_ADD.
65 struct rmatt_event_data {
66 /** The name of the attribute being added. */
68 /** Its bit number. */
73 * Used as data for \ref afs_event() for events of type \p ATTRIBUTE_AFSI_CHANGE.
75 struct afsi_change_event_data {
76 /** Pointer to the row that has changed. */
77 struct osl_row *aft_row;
78 /** Afs info before the change. */
79 struct afs_info *old_afsi;
82 /** Function pointers for table handling. */
84 /** Initializes the other pointers in this struct. */
85 void (*init)(struct afs_table *t);
86 /** The name of this table. */
88 /** Gets called on startup and on \p SIGHUP. */
89 int (*open)(const char *base_dir);
90 /** Gets called on shutdown and on \p SIGHUP. */
92 /** Called by the \a init afs command. */
93 int (*create)(const char *);
94 /** Handles afs events. */
95 int (*event_handler)(enum afs_events event, struct para_buffer *pb,
99 /** How audio files are selected by afs. */
101 /** Admissible files are determined by a mood definition. */
103 /** All listed files are admissible. */
108 * Data about one audio file.
110 * Needed to produce ls and stat output.
113 /** Usual audio format handler information. */
114 struct afh_info afhi;
115 /** Audio file selector information. */
116 struct afs_info afsi;
117 /** The full path of the audio file. */
119 /** The score value (if -a was given). */
121 /** The hash value of audio file data. */
126 * Codes used for communication between the server and the afs process.
128 * Before forking the afs child, para_server creates a bidirectional pipe
129 * through which both processes communicate. Usually para_server requests a new
130 * audio in order to start streaming or when the end of the current audio file
131 * has been reached. The afs process responds to such a request by sending
132 * back an eight byte buffer. The first four bytes is the uint32_t
133 * representation of the code, usually \p NEXT_AUDIO_FILE if an admissible
134 * audio file was found, successfully opened and verified. The other four bytes
135 * represent the shared memory id of the shared memory area that contains
136 * details about the audio file to be streamed next. The open file descriptor
137 * of that file is also passed from afs to para_server through the same pipe.
139 enum afs_server_code {
140 /** An audio file was successfully opened. */
142 /** No admissible audio file was found. */
146 /** Flags passed to for_each_matching_row(). */
147 enum pattern_match_flags {
148 /** Loop in reverse order. */
150 /** If no pattern is given, loop over all rows. */
151 PM_NO_PATTERN_MATCHES_EVERYTHING = 2,
152 /** If the data in match_column is the empty string, skip this row. */
153 PM_SKIP_EMPTY_NAME = 4,
156 /** Structure passed to for_each_matching_row(). */
157 struct pattern_match_data {
158 /** Loop over all rows in this table. */
159 struct osl_table *table;
160 /** Determines the loop order. Must be an rbtree column. */
161 unsigned loop_col_num;
162 /** Data from this column is matched against the given patterns. */
163 unsigned match_col_num;
164 /** \see pattern_match_flags. */
166 /** This value is passed verbatim to fnmatch(). */
168 /** Null-terminated array of patterns. */
169 struct osl_object patterns;
170 /** Data pointer passed to the action function. */
172 /** Gets increased by one for each match. */
173 unsigned num_matches;
174 /** For each matching row, this function will be called. */
175 int (*action)(struct osl_table *table, struct osl_row *row, const char *name, void *data);
180 * Afs command handlers run as a process which is not related to the afs
181 * process, i.e. they can not change the address space of afs directly.
182 * Therefore afs commands typically consist of two functions: The command
183 * handler and the corresponding callback function that runs in afs context.
185 * \sa send_callback_request().
187 typedef void callback_function(int fd, const struct osl_object *);
190 * Callbacks send chunks to data back to the command handler. Pointers to
191 * this type of function are used by \ref send_callback_request and friends
192 * to deal with the data in the command handler process.
194 * \sa \ref send_callback_request().
196 typedef int callback_result_handler(struct osl_object *result, uint8_t band, void *private);
197 int afs_cb_result_handler(struct osl_object *result, uint8_t band, void *private);
198 int pass_buffer_as_shm(int fd, uint8_t band, const char *buf, size_t size);
200 /** Structure passed to the AFS max_size handler. */
201 struct afs_max_size_handler_data {
202 /** Local socket connecting the command handler and the AFS process. */
204 /** The sideband designator for this data packet. */
209 * Standard max_size handler for AFS commands.
211 * \param buf Contains (part of) the AFS command output.
212 * \param size The number of bytes in \a buf.
213 * \param private Pointer to a \ref afs_max_size_handler_data structure.
215 * Whenever the output of an AFS command exceeds the maximal size of a shared
216 * memory area, the max size handler of the para_buffer which holds the command
217 * output is called with \a private being a pointer to a structure of type
218 * afs_max_size_handler_data.
220 * \return The return value of the underlying call to \ref
221 * pass_buffer_as_shm().
223 _static_inline_ int afs_max_size_handler(char *buf, size_t size, void *private)
225 struct afs_max_size_handler_data *amshd = private;
226 return pass_buffer_as_shm(amshd->fd, amshd->band, buf, size);
229 __noreturn void afs_init(uint32_t cookie, int socket_fd);
230 void afs_event(enum afs_events event, struct para_buffer *pb,
232 int send_callback_request(callback_function *f, struct osl_object *query,
233 callback_result_handler *result_handler,
234 void *private_result_data);
235 int send_option_arg_callback_request(struct osl_object *options,
236 int argc, char * const * const argv, callback_function *f,
237 callback_result_handler *result_handler,
238 void *private_result_data);
239 int send_standard_callback_request(int argc, char * const * const argv,
240 callback_function *f, callback_result_handler *result_handler,
241 void *private_result_data);
242 int string_compare(const struct osl_object *obj1, const struct osl_object *obj2);
243 int for_each_matching_row(struct pattern_match_data *pmd);
246 void score_init(struct afs_table *t);
247 int admissible_file_loop(void *data, osl_rbtree_loop_func *func);
248 int admissible_file_loop_reverse(void *data, osl_rbtree_loop_func *func);
249 int score_get_best(struct osl_row **aft_row, long *score);
250 int get_score_and_aft_row(struct osl_row *score_row, long *score, struct osl_row **aft_row);
251 int score_add(const struct osl_row *row, long score);
252 int score_update(const struct osl_row *aft_row, long new_score);
253 int get_num_admissible_files(unsigned *num);
254 int score_delete(const struct osl_row *aft_row);
255 int clear_score_table(void);
256 int row_belongs_to_score_table(const struct osl_row *aft_row, unsigned *rank);
259 void attribute_init(struct afs_table *t);
260 void get_attribute_bitmap(const uint64_t *atts, char *buf); /* needed by com_ls() */
261 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum);
262 int get_attribute_text(uint64_t *atts, const char *delim, char **text);
265 void aft_init(struct afs_table *t);
266 int aft_get_row_of_path(const char *path, struct osl_row **row);
267 int open_and_update_audio_file(struct osl_row *aft_row, long score,
268 struct audio_file_data *afd);
269 int load_afd(int shmid, struct audio_file_data *afd);
270 int get_afsi_of_row(const struct osl_row *row, struct afs_info *afsi);
271 int get_afhi_of_row(const struct osl_row *row, struct afh_info *afhi);
272 int get_audio_file_path_of_row(const struct osl_row *row, char **path);
273 int audio_file_loop(void *private_data, osl_rbtree_loop_func *func);
274 void aft_check_callback(int fd, __a_unused const struct osl_object *query);
277 int playlist_open(char *name);
278 void playlist_close(void);
279 void playlist_check_callback(int fd, __a_unused const struct osl_object *query);
281 /** evaluates to 1 if x < y, to -1 if x > y and to 0 if x == y */
282 #define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
285 /** Define exported functions and a table pointer for an osl blob table. */
286 #define DECLARE_BLOB_SYMBOLS(table_name, cmd_prefix) \
287 void table_name ## _init(struct afs_table *t); \
288 int cmd_prefix ## _get_name_by_id(uint32_t id, char **name); \
289 int cmd_prefix ## _get_def_by_id(uint32_t id, struct osl_object *def); \
290 int cmd_prefix ## _get_def_by_name(char *name, struct osl_object *def); \
291 int cmd_prefix ## _get_name_and_def_by_row(const struct osl_row *row, \
292 char **name, struct osl_object *def); \
293 int table_name ##_event_handler(enum afs_events event, \
294 struct para_buffer *pb, void *data); \
295 extern struct osl_table *table_name ## _table;
297 DECLARE_BLOB_SYMBOLS(lyrics, lyr);
298 DECLARE_BLOB_SYMBOLS(images, img);
299 DECLARE_BLOB_SYMBOLS(moods, mood);
300 DECLARE_BLOB_SYMBOLS(playlists, pl);
302 /** The columns of an abstract blob table. */
303 enum blob_table_columns {
304 /** The identifier, a positive integer that never repeats. */
306 /** The unique name of the blob. */
308 /** The actual blob contents. */
310 /** A blob table has that many columns. */