Merge the new afs code.
[paraslash.git] / playlist.c
1 #include "para.h"
2 #include "error.h"
3 #include "afs.h"
4 #include "string.h"
5
6 /** \file playlist.c Functions for loading and saving playlists. */
7
8 /** Structure used for adding entries to a playlist. */
9 struct playlist_info {
10 /** The name of the playlist. */
11 char *name;
12 /** The number of entries currently in the playlist. */
13 unsigned length;
14 };
15 static struct playlist_info playlist;
16
17 /**
18 * Re-insert an audio file into the tree of admissible files.
19 *
20 * \param aft_row Determines the audio file.
21 *
22 * \return The return value of score_update().
23 */
24 int playlist_update_audio_file(struct osl_row *aft_row)
25 {
26 /* always re-insert to the top of the tree */
27 return score_update(aft_row, 0);
28 }
29
30 static int add_playlist_entry(char *line, void *private_data)
31 {
32 struct osl_row *aft_row;
33 struct playlist_info *pli = private_data;
34 int ret = aft_get_row_of_path(line, &aft_row);
35
36 if (ret < 0) {
37 PARA_NOTICE_LOG("path not found in audio file table: %s\n",
38 line);
39 return 1;
40 }
41 ret = score_add(aft_row, -pli->length);
42 if (ret < 0) {
43 PARA_ERROR_LOG("failed to add %s: %d\n", line, ret);
44 return ret;
45 }
46 pli->length++;
47 return 1;
48 }
49
50 static int load_playlist(struct osl_row *row)
51 {
52 struct osl_object obj;
53 int ret;
54
55 ret = osl_get_object(playlists_table, row, BLOBCOL_NAME, &obj);
56 if (ret < 0)
57 return ret;
58 playlist.name = para_strdup(obj.data);
59 playlist.length = 0;
60 ret = osl_open_disk_object(playlists_table, row, BLOBCOL_DEF, &obj);
61 if (ret < 0)
62 goto err;
63 ret = for_each_line_ro(obj.data, obj.size, add_playlist_entry,
64 &playlist);
65 osl_close_disk_object(&obj);
66 if (ret < 0)
67 goto err;
68 ret = -E_PLAYLIST_EMPTY;
69 if (!playlist.length)
70 goto err;
71 PARA_NOTICE_LOG("loaded playlist %s (%u files)\n", playlist.name,
72 playlist.length);
73 return 1;
74 err:
75 free(playlist.name);
76 return ret;
77 }
78
79 /* returns -E_PLAYLIST_LOADED on _success_ to terminate the loop */
80 static int playlist_loop(struct osl_row *row, __a_unused void *private_data)
81 {
82 int ret = load_playlist(row);
83 if (ret < 0) {
84 if (ret != -E_DUMMY_ROW)
85 PARA_NOTICE_LOG("unable to load playlist, trying next\n");
86 return 1;
87 }
88 return -E_PLAYLIST_LOADED;
89 }
90
91 static int load_first_available_playlist(void)
92 {
93 int ret = osl_rbtree_loop(playlists_table, BLOBCOL_NAME, NULL,
94 playlist_loop);
95 if (ret == -E_PLAYLIST_LOADED) /* success */
96 return 1;
97 if (ret < 0)
98 return ret; /* error */
99 PARA_NOTICE_LOG("no valid playlist found\n");
100 return -E_NO_PLAYLIST;
101 }
102
103 /**
104 * Close the current playlist.
105 *
106 * \sa playlist_open().
107 */
108 void playlist_close(void)
109 {
110 free(playlist.name);
111 playlist.name = NULL;
112 }
113
114 /**
115 * Open the given playlist.
116 *
117 * \param name The name of the playlist to open.
118 *
119 * If name is \p NULL, load the first available playlist. Files which are
120 * listed in the playlist, but not contained in the database are ignored.
121 * This is not considered an error.
122 *
123 * \return Positive on success, negative on errors. Possible errors
124 * include: Given playlist not found, -E_NO_PLAYLIST (no playlist defined).
125 */
126 int playlist_open(char *name)
127 {
128 struct osl_object obj;
129 int ret;
130 struct osl_row *row;
131
132 if (!name)
133 return load_first_available_playlist();
134 obj.data = name;
135 obj.size = strlen(obj.data);
136 ret = osl_get_row(playlists_table, BLOBCOL_NAME, &obj, &row);
137 if (ret < 0) {
138 PARA_NOTICE_LOG("failed to load playlist %s\n", name);
139 return ret;
140 }
141 return load_playlist(row);
142 }