unregister_task(): Print what caused the task to shutdown.
[paraslash.git] / playlist.c
1 /*
2 * Copyright (C) 2007-2008 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 #include "para.h"
8 #include "error.h"
9 #include "string.h"
10 #include "afh.h"
11 #include "afs.h"
12 #include "ipc.h"
13
14 /** \file playlist.c Functions for loading and saving playlists. */
15
16 /** Structure used for adding entries to a playlist. */
17 struct playlist_info {
18 /** The name of the playlist. */
19 char *name;
20 /** The number of entries currently in the playlist. */
21 unsigned length;
22 };
23 static struct playlist_info current_playlist;
24
25 /**
26 * Re-insert an audio file into the tree of admissible files.
27 *
28 * \param aft_row Determines the audio file.
29 *
30 * \return The return value of score_update().
31 */
32 static int playlist_update_audio_file(const struct osl_row *aft_row)
33 {
34 /* always re-insert to the top of the tree */
35 return score_update(aft_row, 0);
36 }
37
38 static int add_playlist_entry(char *path, void *data)
39 {
40 struct playlist_info *playlist = data;
41 struct osl_row *aft_row;
42 int ret = aft_get_row_of_path(path, &aft_row);
43
44 if (ret < 0) {
45 PARA_NOTICE_LOG("%s: %s\n", path, para_strerror(-ret));
46 return 1;
47 }
48 ret = score_add(aft_row, -playlist->length);
49 if (ret < 0) {
50 PARA_ERROR_LOG("failed to add %s: %s\n", path, para_strerror(-ret));
51 return ret;
52 }
53 playlist->length++;
54 return 1;
55 }
56
57 /* returns -E_PLAYLIST_LOADED on _success_ to terminate the loop */
58 static int load_playlist(struct osl_row *row, void *data)
59 {
60 struct playlist_info *playlist = data;
61 struct osl_object playlist_def;
62 char *playlist_name;
63 int ret;
64
65 ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
66 if (ret < 0)
67 goto err;
68 playlist->length = 0;
69 ret = for_each_line_ro(playlist_def.data, playlist_def.size,
70 add_playlist_entry, playlist);
71 osl_close_disk_object(&playlist_def);
72 if (ret < 0)
73 goto err;
74 ret = -E_PLAYLIST_EMPTY;
75 if (!playlist->length)
76 goto err;
77 playlist->name = para_strdup(playlist_name);
78 PARA_NOTICE_LOG("loaded playlist %s (%u files)\n", playlist->name,
79 playlist->length);
80 return -E_PLAYLIST_LOADED;
81 err:
82 if (ret != -E_DUMMY_ROW)
83 PARA_NOTICE_LOG("unable to load playlist (%s)\n",
84 para_strerror(-ret));
85 return 1;
86 }
87
88 static int check_playlist_path(char *path, void *data)
89 {
90 struct para_buffer *pb = data;
91 struct osl_row *aft_row;
92 int ret = aft_get_row_of_path(path, &aft_row);
93
94 if (ret >= 0)
95 return 1;
96 return para_printf(pb, "%s: %s\n", path, para_strerror(-ret));
97 }
98
99 static int check_playlist(struct osl_row *row, void *data)
100 {
101 struct para_buffer *pb = data;
102 struct osl_object playlist_def;
103 char *playlist_name;
104 int ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
105
106 if (ret < 0)
107 return para_printf(pb, "failed to get playlist data: %s\n",
108 para_strerror(-ret));
109 if (*playlist_name) { /* skip dummy row */
110 ret = para_printf(pb, "checking playlist %s...\n", playlist_name);
111 if (ret < 0)
112 return ret;
113 ret = for_each_line_ro(playlist_def.data, playlist_def.size,
114 check_playlist_path, pb);
115 }
116 osl_close_disk_object(&playlist_def);
117 return ret;
118 }
119
120 /**
121 * Check the playlist table for inconsistencies.
122 *
123 * \param fd The afs socket.
124 * \param query Unused.
125 *
126 * \return The return value of the underlying call to osl_rbtree_loop().
127 */
128 void playlist_check_callback(int fd, __a_unused const struct osl_object *query)
129 {
130 struct para_buffer pb = {
131 .max_size = SHMMAX,
132 .private_data = &fd,
133 .max_size_handler = pass_buffer_as_shm
134 };
135 int ret = para_printf(&pb, "checking playlists...\n");
136
137 if (ret < 0)
138 return;
139 osl_rbtree_loop(playlists_table, BLOBCOL_ID, &pb,
140 check_playlist);
141 if (pb.offset)
142 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
143 free(pb.buf);
144 }
145
146 /**
147 * Close the current playlist.
148 *
149 * \sa playlist_open().
150 */
151 void playlist_close(void)
152 {
153 if (!current_playlist.name)
154 return;
155 free(current_playlist.name);
156 current_playlist.name = NULL;
157 }
158
159 /**
160 * Open the given playlist.
161 *
162 * \param name The name of the playlist to open.
163 *
164 * Files which are listed in the playlist, but not contained in the database
165 * are ignored. This is not considered an error.
166 *
167 * \return Standard.
168 */
169 int playlist_open(char *name)
170 {
171 struct osl_object obj;
172 int ret;
173 struct osl_row *row;
174
175 obj.data = name;
176 obj.size = strlen(obj.data);
177 ret = osl_get_row(playlists_table, BLOBCOL_NAME, &obj, &row);
178 if (ret < 0) {
179 PARA_NOTICE_LOG("failed to load playlist %s\n", name);
180 return ret;
181 }
182 playlist_close();
183 ret = load_playlist(row, &current_playlist);
184 return (ret == -E_PLAYLIST_LOADED)? current_playlist.length : ret;
185 }
186
187 static int search_path(char *path, void *data)
188 {
189 if (strcmp(path, data))
190 return 1;
191 return -E_PATH_FOUND;
192 }
193
194 static int handle_audio_file_event(enum afs_events event, void *data)
195 {
196 int ret, was_admissible = 0, is_admissible;
197 struct osl_object playlist_def;
198 char *new_path;
199 const struct osl_row *row = data;
200
201 if (!current_playlist.name)
202 return 1;
203 if (event == AUDIO_FILE_RENAME) {
204 ret = row_belongs_to_score_table(row, NULL);
205 if (ret < 0)
206 return ret;
207 was_admissible = ret;
208 }
209 ret = get_audio_file_path_of_row(row, &new_path);
210 if (ret < 0)
211 return ret;
212 ret = pl_get_def_by_name(current_playlist.name, &playlist_def);
213 if (ret < 0)
214 return ret;
215 ret = for_each_line_ro(playlist_def.data, playlist_def.size,
216 search_path, new_path);
217 osl_close_disk_object(&playlist_def);
218 is_admissible = (ret < 0);
219 if (was_admissible && is_admissible)
220 return 1;
221 if (!was_admissible && !is_admissible)
222 return 1;
223 if (was_admissible && !is_admissible) {
224 current_playlist.length--;
225 return score_delete(row);
226 }
227 /* !was_admissible && is_admissible */
228 current_playlist.length++;
229 return score_add(row, 0); /* play it immediately */
230 }
231
232 /**
233 * Handle afs events relevant to playlists.
234 *
235 * \param event The event type.
236 * \param pb Unused.
237 * \param data Depends on the event type.
238 *
239 * \return Standard.
240 */
241 int playlists_event_handler(enum afs_events event,
242 __a_unused struct para_buffer *pb, void *data)
243 {
244 int ret;
245 struct afsi_change_event_data *aced = data;
246
247 switch(event) {
248 case AFSI_CHANGE:
249 return playlist_update_audio_file(aced->aft_row);
250 case AUDIO_FILE_RENAME:
251 case AUDIO_FILE_ADD:
252 return handle_audio_file_event(event, data);
253 case AUDIO_FILE_REMOVE:
254 ret = row_belongs_to_score_table(data, NULL);
255 if (ret < 0)
256 return ret;
257 if (!ret)
258 return 1;
259 current_playlist.length--;
260 return score_delete(data);
261 default:
262 return 1;
263 }
264 }