-void (*init)(void*);
-/**
- *
- *
- * period of time between sending data chunks
-*/
-struct timeval chunk_tv; /* length of one chunk of data */
-/**
- *
- *
- * end of file timeout - do not load new audio file until this time
- *
-*/
-struct timeval eof_tv; /* timeout on eof */
-/**
- *
- *
- * Pointer to the optional get-header function.
- *
- * This is called from a sender in case a new client connects in the middle of
- * the stream. The audio format handler may set this to NULL to indicate that
- * this audio format does not need any special header treatment. If non-NULL,
- * the function it points to must return a pointer to a buffer holding the
- * current audio file header, together with the header length.
-*/
-char *(*get_header_info)(int *header_len);
-/**
- *
- *
- * check if this audio format handler can handle the file
- *
- * This is a pointer to a function returning whether a given file is valid for
- * this audio format. A negative return value indicates that this audio format
- * handler did not recognize the given file. On success, the function is
- * expected to return a positive value and to fill in \arg info_str, \arg
- * chunks and \arg seconds appropriately.
-*/
-int (*get_file_info)(FILE *audio_file, char *info_str,
- long unsigned *chunks, int *seconds);
-/**
- *
- *
- * cleanup function of this audio format handler
- *
- * This close function should deallocate any resources
- * associated with the current audio file. In particular, it is responsible
- * for closing the file handle. It is assumed to succeed.
-*/
-void (*close_audio_file)(void);
-/**
- *
- *
- * jump to another position in the current audio file
- *
- * This is called if a client issued the ff or jmp command with \a request
- * being the number of the next chunk that should be sent out. Must return a
- * positive value on success and a negative value on errors.
-*/
-int (*reposition_stream)(long unsigned request);
-/**
- *
- *
- * function responsible for reading one data chunk.
- *
- * \a read_chunk() must return a pointer to the next chunk of data that should
- * be sent out, or \p NULL on errors or if the end of the file was encountered.
- *
- * If it returns non-NULL, \a len must contain the length of the returned
- * buffer (which may be zero if nothing has to be sent for some reason).
- * Otherwise, \a len is used to distinguish between the eof and the error case:
- * It must be zero in the eof case, or negative if an error occcured.
-*/
-char * (*read_chunk)(long unsigned chunk_num, ssize_t *len);
+struct audio_file_data {
+ /* Same info as ls -lv -p <current audio file>. */
+ char verbose_ls_output[VERBOSE_LS_OUTPUT_SIZE];
+ /* The open file descriptor to the current audio file. */
+ int fd;
+ /* Vss needs this for streaming. */
+ struct afh_info afhi;
+};
+
+enum afs_server_code {
+ NEXT_AUDIO_FILE,
+ NO_ADMISSIBLE_FILES,
+ AFD_CHANGE
+};
+
+/** Flags passed to for_each_matching_row(). */
+enum pattern_match_flags {
+ /** Loop in reverse order. */
+ PM_REVERSE_LOOP = 1,
+ /** If no pattern is given, loop over all rows. */
+ PM_NO_PATTERN_MATCHES_EVERYTHING = 2,
+ /** If the data in match_column is the empty string, skip this row. */
+ PM_SKIP_EMPTY_NAME = 4,
+};
+
+/** Structure passed to for_each_matching_row(). */
+struct pattern_match_data {
+ /** Loop over all rows in this table. */
+ struct osl_table *table;
+ /** Determines the loop order. Must be an rbtree column. */
+ unsigned loop_col_num;
+ /** Data from this column is matched against the given patterns. */
+ unsigned match_col_num;
+ /** \see pattern_match_flags. */
+ unsigned pm_flags;
+ /** This value is passed verbatim to fnmatch(). */
+ int fnmatch_flags;
+ /** Null-terminated array of patterns. */
+ struct osl_object patterns;
+ /** Data pointer passed to the action function. */
+ void *data;
+ /** For each matching row, this function will be called. */
+ int (*action)(struct osl_table *table, struct osl_row *row, const char *name, void *data);
+};
+
+/* afs */
+typedef int callback_function(const struct osl_object *, struct osl_object *);
+__noreturn void afs_init(uint32_t cookie, int socket_fd);
+void afs_event(enum afs_events event, struct para_buffer *pb,
+ void *data);
+int send_callback_request(callback_function *f, struct osl_object *query,
+ struct osl_object *result);
+int send_standard_callback_request(int argc, char * const * const argv,
+ callback_function *f, struct osl_object *result);
+int send_option_arg_callback_request(struct osl_object *options,
+ int argc, char * const * const argv, callback_function *f,
+ struct osl_object *result);
+int stdin_command(int fd, struct osl_object *arg_obj, callback_function *f,
+ unsigned max_len, struct osl_object *result);
+int string_compare(const struct osl_object *obj1, const struct osl_object *obj2);
+int close_audio_file(struct audio_file_data *afd);
+int for_each_matching_row(struct pattern_match_data *pmd);
+
+/* score */
+void score_init(struct afs_table *t);
+int admissible_file_loop(void *data, osl_rbtree_loop_func *func);
+int admissible_file_loop_reverse(void *data, osl_rbtree_loop_func *func);
+int score_get_best(struct osl_row **aft_row, long *score);
+int get_score_and_aft_row(struct osl_row *score_row, long *score, struct osl_row **aft_row);
+int score_add(const struct osl_row *row, long score);
+int score_update(const struct osl_row *aft_row, long new_score);
+int get_num_admissible_files(unsigned *num);
+int score_delete(const struct osl_row *aft_row);
+int clear_score_table(void);
+int row_belongs_to_score_table(const struct osl_row *aft_row, unsigned *rank);
+
+/* attribute */
+void attribute_init(struct afs_table *t);
+void get_attribute_bitmap(const uint64_t *atts, char *buf); /* needed by com_ls() */
+int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum);
+int get_attribute_text(uint64_t *atts, const char *delim, char **text);
+
+/* aft */
+void aft_init(struct afs_table *t);
+int aft_get_row_of_path(const char *path, struct osl_row **row);
+int open_and_update_audio_file(struct osl_row *aft_row, long score,
+ struct audio_file_data *afd);
+int load_afd(int shmid, struct audio_file_data *afd);
+int load_afsi(struct afs_info *afsi, struct osl_object *obj);
+void save_afsi(struct afs_info *afsi, struct osl_object *obj);
+int get_afsi_of_row(const struct osl_row *row, struct afs_info *afsi);
+int get_afhi_of_row(const struct osl_row *row, struct afh_info *afhi);
+int get_afsi_of_path(const char *path, struct afs_info *afsi);
+int get_audio_file_path_of_row(const struct osl_row *row, char **path);
+int get_afsi_object_of_row(const struct osl_row *row, struct osl_object *obj);
+int audio_file_loop(void *private_data, osl_rbtree_loop_func *func);
+int aft_check_callback(const struct osl_object *query, struct osl_object *result);
+
+/* mood */
+int change_current_mood(char *mood_name);
+void close_current_mood(void);
+int reload_current_mood(void);
+int mood_check_callback(__a_unused const struct osl_object *query,
+ struct osl_object *result);
+
+
+/* playlist */
+int playlist_open(char *name);
+void playlist_close(void);
+int playlist_check_callback(__a_unused const struct osl_object *query,
+ struct osl_object *result);
+
+/** evaluates to 1 if x < y, to -1 if x > y and to 0 if x == y */
+#define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
+
+
+/** Define exported functions and a table pointer for an osl blob table. */
+#define DECLARE_BLOB_SYMBOLS(table_name, cmd_prefix) \
+ void table_name ## _init(struct afs_table *t); \
+ int cmd_prefix ## _get_name_by_id(uint32_t id, char **name); \
+ int cmd_prefix ## _get_def_by_id(uint32_t id, struct osl_object *def); \
+ int cmd_prefix ## _get_def_by_name(char *name, struct osl_object *def); \
+ int cmd_prefix ## _get_name_and_def_by_row(const struct osl_row *row, \
+ char **name, struct osl_object *def); \
+ int table_name ##_event_handler(enum afs_events event, \
+ struct para_buffer *pb, void *data); \
+ extern struct osl_table *table_name ## _table;
+
+DECLARE_BLOB_SYMBOLS(lyrics, lyr);
+DECLARE_BLOB_SYMBOLS(images, img);
+DECLARE_BLOB_SYMBOLS(moods, mood);
+DECLARE_BLOB_SYMBOLS(playlists, pl);
+
+/** The columns of an abstract blob table. */
+enum blob_table_columns {
+ /** The identifier, a positive integer that never repeats. */
+ BLOBCOL_ID,
+ /** The unique name of the blob. */
+ BLOBCOL_NAME,
+ /** The actual blob contents. */
+ BLOBCOL_DEF,
+ /** A blob table has that many columns. */
+ NUM_BLOB_COLUMNS