blob: Remove some unnecessary casts for arguments to read_u32().
[paraslash.git] / playlist.c
1 /*
2  * Copyright (C) 2007 Andre Noll <maan@tuebingen.mpg.de>
3  *
4  * Licensed under the GPL v2. For licencing details see COPYING.
5  */
6
7 #include <regex.h>
8 #include <osl.h>
9 #include <lopsub.h>
10
11 #include "para.h"
12 #include "error.h"
13 #include "string.h"
14 #include "afh.h"
15 #include "afs.h"
16 #include "ipc.h"
17 #include "sideband.h"
18
19 /** \file playlist.c Functions for loading and saving playlists. */
20
21 /** Structure used for adding entries to a playlist. */
22 struct playlist_info {
23         /** The name of the playlist. */
24         char *name;
25         /** The number of entries currently in the playlist. */
26         unsigned length;
27 };
28 static struct playlist_info current_playlist;
29
30 /**
31  * Re-insert an audio file into the tree of admissible files.
32  *
33  * \param aft_row Determines the audio file.
34  *
35  * \return The return value of score_update().
36  */
37 static int playlist_update_audio_file(const struct osl_row *aft_row)
38 {
39         /* always re-insert to the top of the tree */
40         return score_update(aft_row, 0);
41 }
42
43 static int add_playlist_entry(char *path, void *data)
44 {
45         struct playlist_info *playlist = data;
46         struct osl_row *aft_row;
47         int ret = aft_get_row_of_path(path, &aft_row);
48
49         if (ret < 0) {
50                 PARA_NOTICE_LOG("%s: %s\n", path, para_strerror(-ret));
51                 return 1;
52         }
53         ret = score_add(aft_row, -playlist->length);
54         if (ret < 0) {
55                 PARA_ERROR_LOG("failed to add %s: %s\n", path, para_strerror(-ret));
56                 return ret;
57         }
58         playlist->length++;
59         return 1;
60 }
61
62 /* returns -E_PLAYLIST_LOADED on _success_ to terminate the loop */
63 static int load_playlist(struct osl_row *row, void *data)
64 {
65         struct playlist_info *playlist = data;
66         struct osl_object playlist_def;
67         char *playlist_name;
68         int ret;
69
70         ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
71         if (ret < 0)
72                 goto err;
73         playlist->length = 0;
74         ret = for_each_line(FELF_READ_ONLY, playlist_def.data,
75                 playlist_def.size, add_playlist_entry, playlist);
76         osl_close_disk_object(&playlist_def);
77         if (ret < 0)
78                 goto err;
79         ret = -E_PLAYLIST_EMPTY;
80         if (!playlist->length)
81                 goto err;
82         playlist->name = para_strdup(playlist_name);
83         PARA_NOTICE_LOG("loaded playlist %s (%u files)\n", playlist->name,
84                 playlist->length);
85         return -E_PLAYLIST_LOADED;
86 err:
87         if (ret != -E_DUMMY_ROW)
88                 PARA_NOTICE_LOG("unable to load playlist (%s)\n",
89                         para_strerror(-ret));
90         return 1;
91 }
92
93 static int check_playlist_path(char *path, void *data)
94 {
95         struct para_buffer *pb = data;
96         struct osl_row *aft_row;
97         int ret = aft_get_row_of_path(path, &aft_row);
98
99         if (ret < 0)
100                 para_printf(pb, "%s: %s\n", path, para_strerror(-ret));
101         return 1; /* do not fail the loop on bad paths */
102 }
103
104 static int check_playlist(struct osl_row *row, void *data)
105 {
106         struct para_buffer *pb = data;
107         struct osl_object playlist_def;
108         char *playlist_name;
109         int ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
110
111         if (ret < 0) { /* log error, but continue */
112                 para_printf(pb, "failed to get playlist data: %s\n",
113                         para_strerror(-ret));
114                 return 1;
115         }
116         if (*playlist_name) { /* skip dummy row */
117                 para_printf(pb, "checking playlist %s...\n", playlist_name);
118                 for_each_line(FELF_READ_ONLY, playlist_def.data,
119                         playlist_def.size, check_playlist_path, pb);
120         }
121         osl_close_disk_object(&playlist_def);
122         return 1;
123 }
124
125 /**
126  * Check the playlist table for inconsistencies.
127  *
128  * \param aca This callback ignores ->query.
129  *
130  * \return Standard. Invalid paths are reported, but are not considered an
131  * error.
132  */
133 int playlist_check_callback(struct afs_callback_arg *aca)
134 {
135         para_printf(&aca->pbout, "checking playlists...\n");
136         return osl(osl_rbtree_loop(playlists_table, BLOBCOL_ID, &aca->pbout,
137                 check_playlist));
138 }
139
140 /**
141  * Close the current playlist.
142  *
143  * \sa \ref playlist_open().
144  */
145 void playlist_close(void)
146 {
147         if (!current_playlist.name)
148                 return;
149         free(current_playlist.name);
150         current_playlist.name = NULL;
151 }
152
153 /**
154  * Open the given playlist.
155  *
156  * \param name The name of the playlist to open.
157  *
158  * Files which are listed in the playlist, but not contained in the database
159  * are ignored.  This is not considered an error.
160  *
161  * \return Standard.
162  */
163 int playlist_open(const char *name)
164 {
165         struct osl_object obj;
166         int ret;
167         struct osl_row *row;
168
169         obj.data = (char *)name;
170         obj.size = strlen(obj.data);
171         ret = osl(osl_get_row(playlists_table, BLOBCOL_NAME, &obj, &row));
172         if (ret < 0) {
173                 PARA_NOTICE_LOG("failed to load playlist %s\n", name);
174                 return ret;
175         }
176         playlist_close();
177         ret = load_playlist(row, &current_playlist);
178         return (ret == -E_PLAYLIST_LOADED)? current_playlist.length : ret;
179 }
180
181 static int search_path(char *path, void *data)
182 {
183         if (strcmp(path, data))
184                 return 1;
185         return -E_PATH_FOUND;
186 }
187
188 static int handle_audio_file_event(enum afs_events event, void *data)
189 {
190         int ret, was_admissible = 0, is_admissible;
191         struct osl_object playlist_def;
192         char *new_path;
193         const struct osl_row *row = data;
194
195         if (event == AUDIO_FILE_RENAME) {
196                 ret = row_belongs_to_score_table(row, NULL);
197                 if (ret < 0)
198                         return ret;
199                 was_admissible = ret;
200         }
201         ret = get_audio_file_path_of_row(row, &new_path);
202         if (ret < 0)
203                 return ret;
204         ret = pl_get_def_by_name(current_playlist.name, &playlist_def);
205         if (ret < 0)
206                 return ret;
207         ret = for_each_line(FELF_READ_ONLY, playlist_def.data,
208                 playlist_def.size, search_path, new_path);
209         osl_close_disk_object(&playlist_def);
210         is_admissible = (ret < 0);
211         if (was_admissible && is_admissible)
212                 return 1;
213         if (!was_admissible && !is_admissible)
214                 return 1;
215         if (was_admissible && !is_admissible) {
216                 current_playlist.length--;
217                 return score_delete(row);
218         }
219         /* !was_admissible && is_admissible */
220         current_playlist.length++;
221         return score_add(row, 0); /* play it immediately */
222 }
223
224 /**
225  * Handle afs events relevant to playlists.
226  *
227  * \param event The event type.
228  * \param pb Unused.
229  * \param data Depends on the event type.
230  *
231  * \return Standard.
232  */
233 int playlists_event_handler(enum afs_events event,
234         __a_unused struct para_buffer *pb, void *data)
235 {
236         int ret;
237         struct afsi_change_event_data *aced = data;
238
239         if (!current_playlist.name)
240                 return 1;
241         switch (event) {
242         case AFSI_CHANGE:
243                 return playlist_update_audio_file(aced->aft_row);
244         case AUDIO_FILE_RENAME:
245         case AUDIO_FILE_ADD:
246                 return handle_audio_file_event(event, data);
247         case AUDIO_FILE_REMOVE:
248                 ret = row_belongs_to_score_table(data, NULL);
249                 if (ret < 0)
250                         return ret;
251                 if (!ret)
252                         return 1;
253                 current_playlist.length--;
254                 return score_delete(data);
255         default:
256                 return 1;
257         }
258 }