playlist.c

   1 #include "para.h"
   2 #include "error.h"
   3 #include "string.h"
   4 #include "afh.h"
   5 #include "afs.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 /* returns -E_PLAYLIST_LOADED on _success_ to terminate the loop */
  51 static int load_playlist(struct osl_row *row, void *data)
  52 {
  53         struct playlist_info *playlist = data;
  54         struct osl_object playlist_def;
  55         char *playlist_name;
  56         int ret;
  57
  58         ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
  59         if (ret < 0)
  60                 goto err;
  61         playlist->length = 0;
  62         ret = for_each_line_ro(playlist_def.data, playlist_def.size,
  63                 add_playlist_entry, playlist);
  64         osl_close_disk_object(&playlist_def);
  65         if (ret < 0)
  66                 goto err;
  67         ret = -E_PLAYLIST_EMPTY;
  68         if (!playlist->length)
  69                 goto err;
  70         playlist->name = para_strdup(playlist_name);
  71         PARA_NOTICE_LOG("loaded playlist %s (%u files)\n", playlist->name,
  72                 playlist->length);
  73         return -E_PLAYLIST_LOADED;
  74 err:
  75         if (ret != -E_DUMMY_ROW)
  76                 PARA_NOTICE_LOG("unable to load playlist (%s)\n",
  77                         PARA_STRERROR(-ret));
  78         return 1;
  79 }
  80
  81 static int load_first_available_playlist(struct playlist_info *playlist)
  82 {
  83         int ret = osl_rbtree_loop(playlists_table, BLOBCOL_NAME, playlist,
  84                 load_playlist);
  85         if (ret == -E_PLAYLIST_LOADED) /* success */
  86                 return 1;
  87         if (ret < 0)
  88                 return ret; /* error */
  89         PARA_NOTICE_LOG("no valid playlist found\n");
  90         return -E_NO_PLAYLIST;
  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;
 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) {
 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_ro(playlist_def.data, playlist_def.size,
 119                         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 query Unused.
 129  * \param result Contains messages about inconsistencies.
 130  *
 131  * \return The return value of the underlying call to osl_rbtree_loop().
 132  */
 133 int playlist_check_callback(__a_unused const struct osl_object *query,
 134                 struct osl_object *result)
 135 {
 136         struct para_buffer pb = {.buf = NULL};
 137
 138         para_printf(&pb, "checking playlists...\n");
 139         osl_rbtree_loop(playlists_table, BLOBCOL_ID, &pb,
 140                 check_playlist);
 141         result->data = pb.buf;
 142         result->size = pb.size;
 143         return 1;
 144 }
 145
 146 /**
 147  * Close the current playlist.
 148  *
 149  * \sa playlist_open().
 150  */
 151 void playlist_close(void)
 152 {
 153         free(current_playlist.name);
 154         current_playlist.name = NULL;
 155 }
 156
 157 /**
 158  * Open the given playlist.
 159  *
 160  * \param name The name of the playlist to open.
 161  *
 162  * If name is \p NULL, load the first available playlist. Files which are
 163  * listed in the playlist, but not contained in the database are ignored.
 164  * This is not considered an error.
 165  *
 166  * \return Positive on success, negative on errors. Possible errors
 167  * include: Given playlist not found, -E_NO_PLAYLIST (no playlist defined).
 168  */
 169 int playlist_open(char *name)
 170 {
 171         struct osl_object obj;
 172         int ret;
 173         struct osl_row *row;
 174
 175         if (!name)
 176                 return load_first_available_playlist(&current_playlist);
 177         obj.data = name;
 178         obj.size = strlen(obj.data);
 179         ret = osl_get_row(playlists_table, BLOBCOL_NAME, &obj, &row);
 180         if (ret < 0) {
 181                 PARA_NOTICE_LOG("failed to load playlist %s\n", name);
 182                 return ret;
 183         }
 184         return load_playlist(row, &current_playlist);
 185 }