2 * Copyright (C) 2004-2006 Andre Noll <maan@systemlinux.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
19 /** \file random_selector.c An audio file selector which chooses files by random */
21 #include <sys/time.h> /* gettimeofday */
22 #include "server.cmdline.h"
29 static int com_random_info(int, int, char **);
30 extern struct gengetopt_args_info conf
;
31 extern struct misc_meta_data
*mmd
;
33 static unsigned int num_audio_files
, audio_file_count
;
34 static char **audio_file_list
;
36 static int count_audio_files(__a_unused
const char *dir
, __a_unused
const char *name
)
42 static int remember_file(const char *dir
, const char *name
)
44 if (audio_file_count
>= num_audio_files
)
46 audio_file_list
[audio_file_count
] = make_message("%s/%s", dir
, name
);
51 /* array of commands that are supported by this selector */
52 static struct server_command cmds
[] = {
54 .name
= "random_info",
55 .handler
= com_random_info
,
57 .description
= "about the random audio file selector",
58 .synopsis
= "random_info",
61 "Select a random file under the given directory"
67 static int com_random_info(int fd
, __a_unused
int argc
, __a_unused
char *argv
[])
69 return send_buffer(fd
, "Don't use for huge directories as it is "
70 "very inefficient in this case.\n");
74 * Load a list of all audio files into memory and chose num of them randomly.
75 * Called by server to determine next audio file to be streamed.
77 static char **random_get_audio_file_list(unsigned int num
)
81 char **ret_list
= NULL
; /* what we are going to return */
83 audio_file_list
= NULL
;
85 /* first run, just count all audio files. dopey */
86 ret
= find_audio_files(conf
.random_dir_arg
, count_audio_files
);
89 ret
= -E_NOTHING_FOUND
;
92 /* yeah, that doesn't scale, also dopey */
93 audio_file_list
= para_malloc(num_audio_files
* sizeof(char *));
95 /* second run (hot dentry cache, hopefully), fill audio_file_list */
96 ret
= find_audio_files(conf
.random_dir_arg
, remember_file
);
99 /* careful, files might got deleted underneath */
100 num_audio_files
= audio_file_count
; /* can only decrease */
101 len
= PARA_MIN(num
, num_audio_files
);
102 ret
= -E_NOTHING_FOUND
;
103 if (!len
) /* nothing found, return NULL */
105 /* success, return NULL-terminated list */
106 ret_list
= para_calloc((len
+ 1) * sizeof(char *));
107 for (i
= 0; i
< len
; i
++) { /* choose randomly */
108 int r
= (int) ((num_audio_files
+ 0.0) * (rand()
109 / (RAND_MAX
+ 1.0)));
110 ret_list
[i
] = para_strdup(audio_file_list
[r
]);
114 if (audio_file_list
) {
115 for (i
= 0; i
< num_audio_files
; i
++)
116 free(audio_file_list
[i
]);
117 free(audio_file_list
);
121 sprintf(mmd
->selector_info
, "dbinfo1:%s\n", PARA_STRERROR(-ret
));
125 void random_update_audio_file(char *audio_file
)
127 char *dn
= para_dirname(audio_file
);
128 snprintf(mmd
->selector_info
, MMD_INFO_SIZE
- 1,
129 "dbinfo1:current dir: %s\n"
130 "dbinfo2:random_dir: %s\n"
131 "dbinfo3:%d files available\n",
132 dn
, conf
.random_dir_arg
, num_audio_files
);
134 mmd
->selector_info
[MMD_INFO_SIZE
- 1] = '\0';
136 static void random_shutdown(void)
141 * the init function for the random audio file selector
143 * Init all function pointers of \a s, init the info text and seed the
146 * \sa struct audio_file_selector, misc_meta_data::selector_info, mysql.c
148 int random_selector_init(struct audio_file_selector
*s
)
152 PARA_INFO_LOG("%s", "registering random handlers ;)\n");
153 gettimeofday(&now
, NULL
);
156 s
->get_audio_file_list
= random_get_audio_file_list
;
157 s
->shutdown
= random_shutdown
;
158 s
->update_audio_file
= random_update_audio_file
;
159 snprintf(mmd
->selector_info
, MMD_INFO_SIZE
- 1,
160 "dbinfo1: Welcome to the random selector\n"
161 "dbinfo2: random_dir: %s\n", conf
.random_dir_arg
);
162 mmd
->selector_info
[MMD_INFO_SIZE
- 1] = '\0';