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 /* 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 int playlist_check_callback(__a_unused const struct osl_object *query,
 126                 struct osl_object *result)
 127 {
 128         struct para_buffer pb = {.buf = NULL};
 129
 130         para_printf(&pb, "checking playlists...\n");
 131         osl_rbtree_loop(playlists_table, BLOBCOL_ID, &pb,
 132                 check_playlist);
 133         result->data = pb.buf;
 134         result->size = pb.size;
 135         return 1;
 136 }
 137
 138 /**
 139  * Close the current playlist.
 140  *
 141  * \sa playlist_open().
 142  */
 143 void playlist_close(void)
 144 {
 145         free(current_playlist.name);
 146         current_playlist.name = NULL;
 147 }
 148
 149 /**
 150  * Open the given playlist.
 151  *
 152  * \param name The name of the playlist to open.
 153  *
 154  * If name is \p NULL, load the first available playlist. Files which are
 155  * listed in the playlist, but not contained in the database are ignored.
 156  * This is not considered an error.
 157  *
 158  * \return Positive on success, negative on errors. Possible errors
 159  * include: Given playlist not found, -E_NO_PLAYLIST (no playlist defined).
 160  */
 161 int playlist_open(char *name)
 162 {
 163         struct osl_object obj;
 164         int ret;
 165         struct osl_row *row;
 166
 167         if (!name)
 168                 return load_first_available_playlist(&current_playlist);
 169         obj.data = name;
 170         obj.size = strlen(obj.data);
 171         ret = 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         return load_playlist(row, &current_playlist);
 177 }