2 * Copyright (C) 2004-2007 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file random_selector.c An audio file selector which chooses files by random */
9 #include <sys/time.h> /* gettimeofday */
11 #include "server.cmdline.h"
14 #include "afs_common.h"
18 #include "random_selector_command_list.h"
20 extern struct misc_meta_data
*mmd
;
22 static unsigned int num_audio_files
, audio_file_count
;
23 static char **audio_file_list
;
25 static int count_audio_files(__a_unused
const char *dir
, __a_unused
const char *name
)
31 static int remember_file(const char *dir
, const char *name
)
33 if (audio_file_count
< num_audio_files
) {
34 audio_file_list
[audio_file_count
] =
35 make_message("%s/%s", dir
, name
);
41 int com_random_info(int fd
, __a_unused
int argc
, __a_unused
char * const * const argv
)
43 return send_buffer(fd
, "Don't use for huge directories as it is "
44 "very inefficient in this case.\n");
48 * Load a list of all audio files into memory and chose num of them randomly.
49 * Called by server to determine next audio file to be streamed.
51 static char **random_get_audio_file_list(unsigned int num
)
55 char **ret_list
= NULL
; /* what we are going to return */
57 audio_file_list
= NULL
;
59 /* first run, just count all audio files. dopey */
60 ret
= find_audio_files(conf
.random_dir_arg
, count_audio_files
);
63 ret
= -E_NOTHING_FOUND
;
66 /* yeah, that doesn't scale, also dopey */
67 audio_file_list
= para_malloc(num_audio_files
* sizeof(char *));
69 /* second run (hot dentry cache, hopefully), fill audio_file_list */
70 ret
= find_audio_files(conf
.random_dir_arg
, remember_file
);
73 /* careful, files might got deleted underneath */
74 num_audio_files
= audio_file_count
; /* can only decrease */
75 len
= PARA_MIN(num
, num_audio_files
);
76 ret
= -E_NOTHING_FOUND
;
77 if (!len
) /* nothing found, return NULL */
79 /* success, return NULL-terminated list */
80 ret_list
= para_calloc((len
+ 1) * sizeof(char *));
81 for (i
= 0; i
< len
; i
++) { /* choose randomly */
82 int r
= (int) ((num_audio_files
+ 0.0) * (rand()
84 ret_list
[i
] = para_strdup(audio_file_list
[r
]);
88 if (audio_file_list
) {
89 for (i
= 0; i
< num_audio_files
; i
++)
90 free(audio_file_list
[i
]);
91 free(audio_file_list
);
95 sprintf(mmd
->selector_info
, "dbinfo1:%s\n", PARA_STRERROR(-ret
));
99 static void random_update_audio_file(char *audio_file
)
101 char *dn
= para_dirname(audio_file
);
102 snprintf(mmd
->selector_info
, MMD_INFO_SIZE
- 1,
103 "dbinfo1:current dir: %s\n"
104 "dbinfo2:random_dir: %s\n"
105 "dbinfo3:%d files available\n",
106 dn
, conf
.random_dir_arg
, num_audio_files
);
108 mmd
->selector_info
[MMD_INFO_SIZE
- 1] = '\0';
110 static void random_shutdown(void)
115 * the init function for the random audio file selector
117 * \param s pointer ro the struct to iniitalize
119 * Init all function pointers of \a s, init the info text and seed the PRNG.
121 * \sa struct audio_file_selector, misc_meta_data::selector_info, mysql.c
123 int random_selector_init(struct audio_file_selector
*s
)
128 PARA_INFO_LOG("%s", "registering random handlers ;)\n");
129 gettimeofday(&now
, NULL
);
132 s
->cmd_list
= random_selector_cmds
;
133 s
->get_audio_file_list
= random_get_audio_file_list
;
134 s
->shutdown
= random_shutdown
;
135 s
->update_audio_file
= random_update_audio_file
;
136 snprintf(mmd
->selector_info
, MMD_INFO_SIZE
- 1,
137 "dbinfo1: Welcome to the random selector\n"
138 "dbinfo2: random_dir: %s\n", conf
.random_dir_arg
);
139 mmd
->selector_info
[MMD_INFO_SIZE
- 1] = '\0';