playlist.c

   1 #include "para.h"
   2 #include "error.h"
   3 #include "afh.h"
   4 #include "afs.h"
   5 #include "string.h"
   6
   7 /** \file playlist.c Functions for loading and saving playlists. */
   8
   9 /** Structure used for adding entries to a playlist. */
  10 struct playlist_info {
  11         /** The name of the playlist. */
  12         char *name;
  13         /** The number of entries currently in the playlist. */
  14         unsigned length;
  15 };
  16 static struct playlist_info current_playlist;
  17
  18 /**
  19  * Re-insert an audio file into the tree of admissible files.
  20  *
  21  * \param aft_row Determines the audio file.
  22  *
  23  * \return The return value of score_update().
  24  */
  25 int playlist_update_audio_file(struct osl_row *aft_row)
  26 {
  27         /* always re-insert to the top of the tree */
  28         return score_update(aft_row, 0);
  29 }
  30
  31 static int add_playlist_entry(char *path, void *data)
  32 {
  33         struct playlist_info *playlist = data;
  34         struct osl_row *aft_row;
  35         int ret = aft_get_row_of_path(path, &aft_row);
  36
  37         if (ret < 0) {
  38                 PARA_NOTICE_LOG("%s: %s\n", path, PARA_STRERROR(-ret));
  39                 return 1;
  40         }
  41         ret = score_add(aft_row, -playlist->length);
  42         if (ret < 0) {
  43                 PARA_ERROR_LOG("failed to add %s: %d\n", path, ret);
  44                 return ret;
  45         }
  46         playlist->length++;
  47         return 1;
  48 }
  49
  50 static int get_playlist_data(struct osl_row *row, char **playlist_name,
  51                 struct osl_object *playlist_def)
  52 {
  53         struct osl_object obj;
  54         int ret = osl_get_object(playlists_table, row, BLOBCOL_NAME, &obj);
  55         if (ret < 0)
  56                 return ret;
  57         *playlist_name = obj.data;
  58         return osl_open_disk_object(playlists_table, row, BLOBCOL_DEF,
  59                 playlist_def);
  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 = get_playlist_data(row, &playlist_name, &playlist_def);
  71         if (ret < 0)
  72                 goto err;
  73         playlist->length = 0;
  74         ret = for_each_line_ro(playlist_def.data, playlist_def.size,
  75                 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 load_first_available_playlist(struct playlist_info *playlist)
  94 {
  95         int ret = osl_rbtree_loop(playlists_table, BLOBCOL_NAME, playlist,
  96                 load_playlist);
  97         if (ret == -E_PLAYLIST_LOADED) /* success */
  98                 return 1;
  99         if (ret < 0)
 100                 return ret; /* error */
 101         PARA_NOTICE_LOG("no valid playlist found\n");
 102         return -E_NO_PLAYLIST;
 103 }
 104
 105 static int check_playlist_path(char *path, void *data)
 106 {
 107         struct para_buffer *pb = data;
 108         struct osl_row *aft_row;
 109         int ret = aft_get_row_of_path(path, &aft_row);
 110
 111         if (ret < 0)
 112                 para_printf(pb, "%s: %s\n", path, PARA_STRERROR(-ret));
 113         return 1;
 114 }
 115
 116 static int check_playlist(struct osl_row *row, void *data)
 117 {
 118         struct para_buffer *pb = data;
 119         struct osl_object playlist_def;
 120         char *playlist_name;
 121         int ret = get_playlist_data(row, &playlist_name, &playlist_def);
 122
 123         if (ret < 0) {
 124                 para_printf(pb, "failed to get playlist data: %s\n",
 125                         PARA_STRERROR(-ret));
 126                 return 1;
 127         }
 128         if (*playlist_name) { /* skip dummy row */
 129                 para_printf(pb, "checking playlist %s...\n", playlist_name);
 130                 for_each_line_ro(playlist_def.data, playlist_def.size,
 131                         check_playlist_path, pb);
 132         }
 133         osl_close_disk_object(&playlist_def);
 134         return 1;
 135 }
 136
 137 int playlist_check_callback(__a_unused const struct osl_object *query,
 138                 struct osl_object *result)
 139 {
 140         struct para_buffer pb = {.buf = NULL};
 141
 142         para_printf(&pb, "checking playlists...\n");
 143         osl_rbtree_loop(playlists_table, BLOBCOL_ID, &pb,
 144                 check_playlist);
 145         result->data = pb.buf;
 146         result->size = pb.size;
 147         return 1;
 148 }
 149
 150 /**
 151  * Close the current playlist.
 152  *
 153  * \sa playlist_open().
 154  */
 155 void playlist_close(void)
 156 {
 157         free(current_playlist.name);
 158         current_playlist.name = NULL;
 159 }
 160
 161 /**
 162  * Open the given playlist.
 163  *
 164  * \param name The name of the playlist to open.
 165  *
 166  * If name is \p NULL, load the first available playlist. Files which are
 167  * listed in the playlist, but not contained in the database are ignored.
 168  * This is not considered an error.
 169  *
 170  * \return Positive on success, negative on errors. Possible errors
 171  * include: Given playlist not found, -E_NO_PLAYLIST (no playlist defined).
 172  */
 173 int playlist_open(char *name)
 174 {
 175         struct osl_object obj;
 176         int ret;
 177         struct osl_row *row;
 178
 179         if (!name)
 180                 return load_first_available_playlist(&current_playlist);
 181         obj.data = name;
 182         obj.size = strlen(obj.data);
 183         ret = osl_get_row(playlists_table, BLOBCOL_NAME, &obj, &row);
 184         if (ret < 0) {
 185                 PARA_NOTICE_LOG("failed to load playlist %s\n", name);
 186                 return ret;
 187         }
 188         return load_playlist(row, &current_playlist);
 189 }