playlist.c

   1 /*
   2  * Copyright (C) 2007-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 #include <regex.h>
   8 #include <osl.h>
   9
  10 #include "para.h"
  11 #include "error.h"
  12 #include "string.h"
  13 #include "afh.h"
  14 #include "afs.h"
  15 #include "ipc.h"
  16
  17 /** \file playlist.c Functions for loading and saving playlists. */
  18
  19 /** Structure used for adding entries to a playlist. */
  20 struct playlist_info {
  21         /** The name of the playlist. */
  22         char *name;
  23         /** The number of entries currently in the playlist. */
  24         unsigned length;
  25 };
  26 static struct playlist_info current_playlist;
  27
  28 /**
  29  * Re-insert an audio file into the tree of admissible files.
  30  *
  31  * \param aft_row Determines the audio file.
  32  *
  33  * \return The return value of score_update().
  34  */
  35 static int playlist_update_audio_file(const struct osl_row *aft_row)
  36 {
  37         /* always re-insert to the top of the tree */
  38         return score_update(aft_row, 0);
  39 }
  40
  41 static int add_playlist_entry(char *path, void *data)
  42 {
  43         struct playlist_info *playlist = data;
  44         struct osl_row *aft_row;
  45         int ret = aft_get_row_of_path(path, &aft_row);
  46
  47         if (ret < 0) {
  48                 PARA_NOTICE_LOG("%s: %s\n", path, para_strerror(-ret));
  49                 return 1;
  50         }
  51         ret = score_add(aft_row, -playlist->length);
  52         if (ret < 0) {
  53                 PARA_ERROR_LOG("failed to add %s: %s\n", path, para_strerror(-ret));
  54                 return ret;
  55         }
  56         playlist->length++;
  57         return 1;
  58 }
  59
  60 /* returns -E_PLAYLIST_LOADED on _success_ to terminate the loop */
  61 static int load_playlist(struct osl_row *row, void *data)
  62 {
  63         struct playlist_info *playlist = data;
  64         struct osl_object playlist_def;
  65         char *playlist_name;
  66         int ret;
  67
  68         ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
  69         if (ret < 0)
  70                 goto err;
  71         playlist->length = 0;
  72         ret = for_each_line_ro(playlist_def.data, playlist_def.size,
  73                 add_playlist_entry, playlist);
  74         osl_close_disk_object(&playlist_def);
  75         if (ret < 0)
  76                 goto err;
  77         ret = -E_PLAYLIST_EMPTY;
  78         if (!playlist->length)
  79                 goto err;
  80         playlist->name = para_strdup(playlist_name);
  81         PARA_NOTICE_LOG("loaded playlist %s (%u files)\n", playlist->name,
  82                 playlist->length);
  83         return -E_PLAYLIST_LOADED;
  84 err:
  85         if (ret != -E_DUMMY_ROW)
  86                 PARA_NOTICE_LOG("unable to load playlist (%s)\n",
  87                         para_strerror(-ret));
  88         return 1;
  89 }
  90
  91 static int check_playlist_path(char *path, void *data)
  92 {
  93         struct para_buffer *pb = data;
  94         struct osl_row *aft_row;
  95         int ret = aft_get_row_of_path(path, &aft_row);
  96
  97         if (ret >= 0)
  98                 return 1;
  99         return para_printf(pb, "%s: %s\n", path, para_strerror(-ret));
 100 }
 101
 102 static int check_playlist(struct osl_row *row, void *data)
 103 {
 104         struct para_buffer *pb = data;
 105         struct osl_object playlist_def;
 106         char *playlist_name;
 107         int ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
 108
 109         if (ret < 0)
 110                 return para_printf(pb, "failed to get playlist data: %s\n",
 111                         para_strerror(-ret));
 112         if (*playlist_name) { /* skip dummy row */
 113                 ret = para_printf(pb, "checking playlist %s...\n", playlist_name);
 114                 if (ret < 0)
 115                         return ret;
 116                 ret = for_each_line_ro(playlist_def.data, playlist_def.size,
 117                         check_playlist_path, pb);
 118         }
 119         osl_close_disk_object(&playlist_def);
 120         return ret;
 121 }
 122
 123 /**
 124  * Check the playlist table for inconsistencies.
 125  *
 126  * \param fd The afs socket.
 127  * \param query Unused.
 128  *
 129  * \return The return value of the underlying call to osl_rbtree_loop().
 130  */
 131 void playlist_check_callback(int fd, __a_unused const struct osl_object *query)
 132 {
 133         struct para_buffer pb = {
 134                 .max_size = SHMMAX,
 135                 .private_data = &fd,
 136                 .max_size_handler = pass_buffer_as_shm
 137         };
 138         int ret = para_printf(&pb, "checking playlists...\n");
 139
 140         if (ret < 0)
 141                 return;
 142         osl_rbtree_loop(playlists_table, BLOBCOL_ID, &pb,
 143                 check_playlist);
 144         if (pb.offset)
 145                 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
 146         free(pb.buf);
 147 }
 148
 149 /**
 150  * Close the current playlist.
 151  *
 152  * \sa playlist_open().
 153  */
 154 void playlist_close(void)
 155 {
 156         if (!current_playlist.name)
 157                 return;
 158         free(current_playlist.name);
 159         current_playlist.name = NULL;
 160 }
 161
 162 /**
 163  * Open the given playlist.
 164  *
 165  * \param name The name of the playlist to open.
 166  *
 167  * Files which are listed in the playlist, but not contained in the database
 168  * are ignored.  This is not considered an error.
 169  *
 170  * \return Standard.
 171  */
 172 int playlist_open(char *name)
 173 {
 174         struct osl_object obj;
 175         int ret;
 176         struct osl_row *row;
 177
 178         obj.data = name;
 179         obj.size = strlen(obj.data);
 180         ret = osl(osl_get_row(playlists_table, BLOBCOL_NAME, &obj, &row));
 181         if (ret < 0) {
 182                 PARA_NOTICE_LOG("failed to load playlist %s\n", name);
 183                 return ret;
 184         }
 185         playlist_close();
 186         ret = load_playlist(row, &current_playlist);
 187         return (ret == -E_PLAYLIST_LOADED)? current_playlist.length : ret;
 188 }
 189
 190 static int search_path(char *path, void *data)
 191 {
 192         if (strcmp(path, data))
 193                 return 1;
 194         return -E_PATH_FOUND;
 195 }
 196
 197 static int handle_audio_file_event(enum afs_events event, void *data)
 198 {
 199         int ret, was_admissible = 0, is_admissible;
 200         struct osl_object playlist_def;
 201         char *new_path;
 202         const struct osl_row *row = data;
 203
 204         if (!current_playlist.name)
 205                 return 1;
 206         if (event == AUDIO_FILE_RENAME) {
 207                 ret = row_belongs_to_score_table(row, NULL);
 208                 if (ret < 0)
 209                         return ret;
 210                 was_admissible = ret;
 211         }
 212         ret = get_audio_file_path_of_row(row, &new_path);
 213         if (ret < 0)
 214                 return ret;
 215         ret = pl_get_def_by_name(current_playlist.name, &playlist_def);
 216         if (ret < 0)
 217                 return ret;
 218         ret = for_each_line_ro(playlist_def.data, playlist_def.size,
 219                 search_path, new_path);
 220         osl_close_disk_object(&playlist_def);
 221         is_admissible = (ret < 0);
 222         if (was_admissible && is_admissible)
 223                 return 1;
 224         if (!was_admissible && !is_admissible)
 225                 return 1;
 226         if (was_admissible && !is_admissible) {
 227                 current_playlist.length--;
 228                 return score_delete(row);
 229         }
 230         /* !was_admissible && is_admissible */
 231         current_playlist.length++;
 232         return score_add(row, 0); /* play it immediately */
 233 }
 234
 235 /**
 236  * Handle afs events relevant to playlists.
 237  *
 238  * \param event The event type.
 239  * \param pb Unused.
 240  * \param data Depends on the event type.
 241  *
 242  * \return Standard.
 243  */
 244 int playlists_event_handler(enum afs_events event,
 245         __a_unused struct para_buffer *pb, void *data)
 246 {
 247         int ret;
 248         struct afsi_change_event_data *aced = data;
 249
 250         switch(event) {
 251         case AFSI_CHANGE:
 252                 return playlist_update_audio_file(aced->aft_row);
 253         case AUDIO_FILE_RENAME:
 254         case AUDIO_FILE_ADD:
 255                 return handle_audio_file_event(event, data);
 256         case AUDIO_FILE_REMOVE:
 257                 ret = row_belongs_to_score_table(data, NULL);
 258                 if (ret < 0)
 259                         return ret;
 260                 if (!ret)
 261                         return 1;
 262                 current_playlist.length--;
 263                 return score_delete(data);
 264         default:
 265                 return 1;
 266         }
 267 }