2 * Copyright (C) 2006-2007 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file playlist_selector.c The playlist audio file selector of paraslash */
12 #include "afs_common.h"
18 #include "user_list.h"
19 #include "playlist_selector_command_list.h"
22 * structure used for transmission of the playlist
24 * There's one such struct which gets initialized during startup. It lives in
25 * shared memory and is used by com_lpl().
27 struct pls_client_data {
28 /** allocated and set by com_lpl() (child) */
30 /** the size of the shared memory area identified by \a shm_id */
32 /** initially locked, gets unlocked by parent when it is done */
34 /** return value, set by parent */
38 /** data specific to the playlist selector */
39 struct private_pls_data {
40 /** guards against concurrent client access */
42 /** guards against concurrent parent-child access */
44 /** pointer to the client data */
45 struct pls_client_data *client_data;
46 /** id of the shm corresponding to \a client_data */
47 int client_data_shm_id;
50 /** we refuse to load playlists bigger than that */
51 #define MAX_PLAYLIST_BYTES (1024 * 1024)
53 static unsigned playlist_len, playlist_size, current_playlist_entry;
54 static char **playlist;
55 static struct audio_file_selector *self;
57 extern struct misc_meta_data *mmd;
59 static int playlist_add(char *path, __a_unused void *data)
61 if (playlist_len >= playlist_size) {
62 playlist_size = 2 * playlist_size + 1;
63 playlist = para_realloc(playlist, playlist_size * sizeof(char *));
65 PARA_DEBUG_LOG("adding #%d/%d: %s\n", playlist_len, playlist_size, path);
66 playlist[playlist_len++] = para_strdup(path);
70 static int send_playlist_to_server(const char *buf, size_t size)
72 struct private_pls_data *ppd = self->private_data;
73 int ret, shm_mutex = -1, shm_id = -1;
76 PARA_DEBUG_LOG("new playlist (%zd bytes)\n", size);
88 ret = shm_attach(shm_id, ATTACH_RW, &shm);
91 mutex_lock(shm_mutex);
92 memcpy(shm, buf, size);
93 mutex_lock(ppd->client_mutex);
94 mutex_lock(ppd->server_mutex);
95 ppd->client_data->size = size;
96 ppd->client_data->shm_id = shm_id;
97 ppd->client_data->mutex = shm_mutex;
98 kill(getppid(), SIGUSR1); /* wake up the server */
99 mutex_unlock(ppd->server_mutex);
100 mutex_lock(shm_mutex); /* wait until server is done */
101 mutex_unlock(shm_mutex);
102 ret = ppd->client_data->retval;
103 mutex_unlock(ppd->client_mutex);
108 mutex_destroy(shm_mutex);
109 PARA_DEBUG_LOG("returning %d\n", ret);
113 int com_lpl(int fd, __a_unused int argc, __a_unused char * const * const argv)
116 size_t bufsize = 4096; /* guess that's enough */
117 char *buf = para_malloc(bufsize);
119 ret = send_buffer(fd, AWAITING_DATA_MSG);
123 ret = recv_bin_buffer(fd, buf + loaded, bufsize - loaded);
127 ret = send_playlist_to_server(buf, loaded);
131 ret = -E_LOAD_PLAYLIST;
132 if (loaded >= MAX_PLAYLIST_BYTES)
134 if (loaded >= bufsize) {
136 buf = para_realloc(buf, bufsize);
144 int com_ppl(int fd, __a_unused int argc, __a_unused char * const * const argv)
148 PARA_DEBUG_LOG("sending playlist to client (%d entries)\n", playlist_len);
149 for (i = 0; i < playlist_len; i++) {
150 int ret = send_va_buffer(fd, "%s\n", playlist[
151 (i + current_playlist_entry) % playlist_len]);
158 static char **pls_get_audio_file_list(unsigned int num)
163 num = PARA_MIN(num, playlist_len);
166 file_list = para_malloc((num + 1) * sizeof(char *));
167 for (i = 0; i < num; i++) {
168 unsigned j = (current_playlist_entry + i + 1) % playlist_len;
169 file_list[i] = para_strdup(playlist[j]);
175 static void free_playlist_contents(void)
179 PARA_DEBUG_LOG("freeing playlist (%d entries)\n", playlist_len);
180 for (i = 0; i < playlist_len; i++)
182 current_playlist_entry = 0;
186 static void pls_shutdown(void)
188 struct private_pls_data *ppd = self->private_data;
190 shm_detach(ppd->client_data);
191 shm_destroy(ppd->client_data_shm_id);
192 mutex_destroy(ppd->server_mutex);
193 mutex_destroy(ppd->client_mutex);
195 free_playlist_contents();
202 static void pls_post_select(__a_unused fd_set *rfds, __a_unused fd_set *wfds)
204 struct private_pls_data *ppd = self->private_data;
205 struct pls_client_data *pcd = ppd->client_data;
209 mutex_lock(ppd->server_mutex);
212 free_playlist_contents();
213 ret = shm_attach(pcd->shm_id, ATTACH_RW, &shm);
215 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
218 PARA_DEBUG_LOG("loading new playlist (%zd bytes)\n", pcd->size);
219 ret = for_each_line((char *)shm, pcd->size, &playlist_add, NULL);
221 PARA_NOTICE_LOG("new playlist (%d entries)\n", playlist_len);
222 sprintf(mmd->selector_info, "dbinfo1:new playlist: %d files\n"
223 "dbinfo2:\ndbinfo3:\n", playlist_len);
226 mutex_unlock(pcd->mutex);
228 mutex_unlock(ppd->server_mutex);
231 static size_t string_offset(const char *str, size_t max)
233 size_t l = strlen(str);
240 static void pls_update_audio_file(char *audio_file)
243 char *dir = para_dirname(audio_file),
244 *prev = playlist[current_playlist_entry % playlist_len];
245 size_t dir_off = string_offset(dir, 50),
246 prev_off = string_offset(prev, 70);
248 for (i = 1; i <= playlist_len; i++) {
251 unsigned j = (current_playlist_entry + i) % playlist_len;
252 if (strcmp(playlist[j], audio_file))
254 current_playlist_entry = j;
255 next = playlist[(j + 1) %playlist_len];
256 next_off = string_offset(next, 70);
257 snprintf(mmd->selector_info, MMD_INFO_SIZE,
258 "dbinfo1: %d files, current dir: %s%s\n"
259 "dbinfo2: prev: %s%s\n"
260 "dbinfo3: next: %s%s\n",
262 dir_off? "... " : "", dir + dir_off,
263 prev_off? "... " : "", prev + prev_off,
264 next_off? "... " : "", next + next_off
272 * the init function for the playlist selector
274 * \param afs pointer to the struct to initialize
276 * Init all function pointers of \a afs
278 * \sa struct audio_file_selector, misc_meta_data::selector_info, mysql.c
281 int playlist_selector_init(struct audio_file_selector *afs)
284 struct private_pls_data *ppd = NULL;
288 afs->cmd_list = playlist_selector_cmds;
289 afs->get_audio_file_list = pls_get_audio_file_list;
290 afs->shutdown = pls_shutdown;
291 afs->post_select = pls_post_select;
292 afs->update_audio_file = pls_update_audio_file;
293 ppd = para_calloc(sizeof(struct private_pls_data));
294 afs->private_data = ppd;
296 ppd->client_mutex = -1;
297 ppd->server_mutex = -1;
298 ppd->client_data_shm_id = -1;
299 ppd->client_data = NULL;
304 ppd->client_mutex = ret;
309 ppd->server_mutex = ret;
311 ret = shm_new(sizeof(struct pls_client_data));
314 ppd->client_data_shm_id = ret;
316 ret = shm_attach(ppd->client_data_shm_id, ATTACH_RW, &shm);
319 ppd->client_data = shm;
320 ppd->client_data->size = 0;
321 sprintf(mmd->selector_info, "dbinfo1: Welcome to the playlist "
322 "selector\ndbinfo2: no playlist loaded\ndbinfo3:\n");
325 if (ppd->client_data_shm_id >= 0)
326 shm_destroy(ppd->client_data_shm_id);
327 if (ppd->client_mutex >= 0)
328 mutex_destroy(ppd->client_mutex);
329 if (ppd->server_mutex >= 0)
330 mutex_destroy(ppd->server_mutex);