playlist.c

   1 /*
   2  * Copyright (C) 2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 #include "para.h"
   8 #include "error.h"
   9 #include "string.h"
  10 #include "afh.h"
  11 #include "afs.h"
  12
  13 /** \file playlist.c Functions for loading and saving playlists. */
  14
  15 /** Structure used for adding entries to a playlist. */
  16 struct playlist_info {
  17         /** The name of the playlist. */
  18         char *name;
  19         /** The number of entries currently in the playlist. */
  20         unsigned length;
  21 };
  22 static struct playlist_info current_playlist;
  23
  24 /**
  25  * Re-insert an audio file into the tree of admissible files.
  26  *
  27  * \param aft_row Determines the audio file.
  28  *
  29  * \return The return value of score_update().
  30  */
  31 static int playlist_update_audio_file(const struct osl_row *aft_row)
  32 {
  33         /* always re-insert to the top of the tree */
  34         return score_update(aft_row, 0);
  35 }
  36
  37 static int add_playlist_entry(char *path, void *data)
  38 {
  39         struct playlist_info *playlist = data;
  40         struct osl_row *aft_row;
  41         int ret = aft_get_row_of_path(path, &aft_row);
  42
  43         if (ret < 0) {
  44                 PARA_NOTICE_LOG("%s: %s\n", path, PARA_STRERROR(-ret));
  45                 return 1;
  46         }
  47         ret = score_add(aft_row, -playlist->length);
  48         if (ret < 0) {
  49                 PARA_ERROR_LOG("failed to add %s: %s\n", path, PARA_STRERROR(-ret));
  50                 return ret;
  51         }
  52         playlist->length++;
  53         return 1;
  54 }
  55
  56 /* returns -E_PLAYLIST_LOADED on _success_ to terminate the loop */
  57 static int load_playlist(struct osl_row *row, void *data)
  58 {
  59         struct playlist_info *playlist = data;
  60         struct osl_object playlist_def;
  61         char *playlist_name;
  62         int ret;
  63
  64         ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
  65         if (ret < 0)
  66                 goto err;
  67         playlist->length = 0;
  68         ret = for_each_line_ro(playlist_def.data, playlist_def.size,
  69                 add_playlist_entry, playlist);
  70         osl_close_disk_object(&playlist_def);
  71         if (ret < 0)
  72                 goto err;
  73         ret = -E_PLAYLIST_EMPTY;
  74         if (!playlist->length)
  75                 goto err;
  76         playlist->name = para_strdup(playlist_name);
  77         PARA_NOTICE_LOG("loaded playlist %s (%u files)\n", playlist->name,
  78                 playlist->length);
  79         return -E_PLAYLIST_LOADED;
  80 err:
  81         if (ret != -E_DUMMY_ROW)
  82                 PARA_NOTICE_LOG("unable to load playlist (%s)\n",
  83                         PARA_STRERROR(-ret));
  84         return 1;
  85 }
  86
  87 static int check_playlist_path(char *path, void *data)
  88 {
  89         struct para_buffer *pb = data;
  90         struct osl_row *aft_row;
  91         int ret = aft_get_row_of_path(path, &aft_row);
  92
  93         if (ret < 0)
  94                 para_printf(pb, "%s: %s\n", path, PARA_STRERROR(-ret));
  95         return 1;
  96 }
  97
  98 static int check_playlist(struct osl_row *row, void *data)
  99 {
 100         struct para_buffer *pb = data;
 101         struct osl_object playlist_def;
 102         char *playlist_name;
 103         int ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
 104
 105         if (ret < 0) {
 106                 para_printf(pb, "failed to get playlist data: %s\n",
 107                         PARA_STRERROR(-ret));
 108                 return 1;
 109         }
 110         if (*playlist_name) { /* skip dummy row */
 111                 para_printf(pb, "checking playlist %s...\n", playlist_name);
 112                 for_each_line_ro(playlist_def.data, playlist_def.size,
 113                         check_playlist_path, pb);
 114         }
 115         osl_close_disk_object(&playlist_def);
 116         return 1;
 117 }
 118
 119 /**
 120  * Check the playlist table for inconsistencies.
 121  *
 122  * \param query Unused.
 123  * \param result Contains messages about inconsistencies.
 124  *
 125  * \return The return value of the underlying call to osl_rbtree_loop().
 126  */
 127 int playlist_check_callback(__a_unused const struct osl_object *query,
 128                 struct osl_object *result)
 129 {
 130         struct para_buffer pb = {.buf = NULL};
 131
 132         para_printf(&pb, "checking playlists...\n");
 133         osl_rbtree_loop(playlists_table, BLOBCOL_ID, &pb,
 134                 check_playlist);
 135         result->data = pb.buf;
 136         result->size = pb.size;
 137         return 1;
 138 }
 139
 140 /**
 141  * Close the current playlist.
 142  *
 143  * \sa 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(char *name)
 164 {
 165         struct osl_object obj;
 166         int ret;
 167         struct osl_row *row;
 168
 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         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 (!current_playlist.name)
 196                 return 1;
 197         if (event == AUDIO_FILE_RENAME) {
 198                 ret = row_belongs_to_score_table(row, NULL);
 199                 if (ret < 0)
 200                         return ret;
 201                 was_admissible = ret;
 202         }
 203         ret = get_audio_file_path_of_row(row, &new_path);
 204         if (ret < 0)
 205                 return ret;
 206         ret = pl_get_def_by_name(current_playlist.name, &playlist_def);
 207         if (ret < 0)
 208                 return ret;
 209         ret = for_each_line_ro(playlist_def.data, playlist_def.size,
 210                 search_path, new_path);
 211         osl_close_disk_object(&playlist_def);
 212         is_admissible = (ret < 0);
 213         if (was_admissible && is_admissible)
 214                 return 1;
 215         if (!was_admissible && !is_admissible)
 216                 return 1;
 217         if (was_admissible && !is_admissible) {
 218                 current_playlist.length--;
 219                 return score_delete(row);
 220         }
 221         /* !was_admissible && is_admissible */
 222         current_playlist.length++;
 223         return score_add(row, 0); /* play it immediately */
 224 }
 225
 226 /**
 227  * Handle afs events relevant to playlists.
 228  *
 229  * \param event The event type.
 230  * \param pb Unused.
 231  * \param data Depends on the event type.
 232  *
 233  * \return Standard.
 234  */
 235 int playlists_event_handler(enum afs_events event,
 236         __a_unused struct para_buffer *pb, void *data)
 237 {
 238         int ret;
 239         struct afsi_change_event_data *aced = data;
 240
 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 }