playlist.c

   1 /*
   2  * Copyright (C) 2007-2012 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 #include "sideband.h"
  17
  18 /** \file playlist.c Functions for loading and saving playlists. */
  19
  20 /** Structure used for adding entries to a playlist. */
  21 struct playlist_info {
  22         /** The name of the playlist. */
  23         char *name;
  24         /** The number of entries currently in the playlist. */
  25         unsigned length;
  26 };
  27 static struct playlist_info current_playlist;
  28
  29 /**
  30  * Re-insert an audio file into the tree of admissible files.
  31  *
  32  * \param aft_row Determines the audio file.
  33  *
  34  * \return The return value of score_update().
  35  */
  36 static int playlist_update_audio_file(const struct osl_row *aft_row)
  37 {
  38         /* always re-insert to the top of the tree */
  39         return score_update(aft_row, 0);
  40 }
  41
  42 static int add_playlist_entry(char *path, void *data)
  43 {
  44         struct playlist_info *playlist = data;
  45         struct osl_row *aft_row;
  46         int ret = aft_get_row_of_path(path, &aft_row);
  47
  48         if (ret < 0) {
  49                 PARA_NOTICE_LOG("%s: %s\n", path, para_strerror(-ret));
  50                 return 1;
  51         }
  52         ret = score_add(aft_row, -playlist->length);
  53         if (ret < 0) {
  54                 PARA_ERROR_LOG("failed to add %s: %s\n", path, para_strerror(-ret));
  55                 return ret;
  56         }
  57         playlist->length++;
  58         return 1;
  59 }
  60
  61 /* returns -E_PLAYLIST_LOADED on _success_ to terminate the loop */
  62 static int load_playlist(struct osl_row *row, void *data)
  63 {
  64         struct playlist_info *playlist = data;
  65         struct osl_object playlist_def;
  66         char *playlist_name;
  67         int ret;
  68
  69         ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
  70         if (ret < 0)
  71                 goto err;
  72         playlist->length = 0;
  73         ret = for_each_line_ro(playlist_def.data, playlist_def.size,
  74                 add_playlist_entry, playlist);
  75         osl_close_disk_object(&playlist_def);
  76         if (ret < 0)
  77                 goto err;
  78         ret = -E_PLAYLIST_EMPTY;
  79         if (!playlist->length)
  80                 goto err;
  81         playlist->name = para_strdup(playlist_name);
  82         PARA_NOTICE_LOG("loaded playlist %s (%u files)\n", playlist->name,
  83                 playlist->length);
  84         return -E_PLAYLIST_LOADED;
  85 err:
  86         if (ret != -E_DUMMY_ROW)
  87                 PARA_NOTICE_LOG("unable to load playlist (%s)\n",
  88                         para_strerror(-ret));
  89         return 1;
  90 }
  91
  92 static int check_playlist_path(char *path, void *data)
  93 {
  94         struct para_buffer *pb = data;
  95         struct osl_row *aft_row;
  96         int ret = aft_get_row_of_path(path, &aft_row);
  97
  98         if (ret >= 0)
  99                 return 1;
 100         return para_printf(pb, "%s: %s\n", path, para_strerror(-ret));
 101 }
 102
 103 static int check_playlist(struct osl_row *row, void *data)
 104 {
 105         struct para_buffer *pb = data;
 106         struct osl_object playlist_def;
 107         char *playlist_name;
 108         int ret = pl_get_name_and_def_by_row(row, &playlist_name, &playlist_def);
 109
 110         if (ret < 0)
 111                 return para_printf(pb, "failed to get playlist data: %s\n",
 112                         para_strerror(-ret));
 113         if (*playlist_name) { /* skip dummy row */
 114                 ret = para_printf(pb, "checking playlist %s...\n", playlist_name);
 115                 if (ret < 0)
 116                         return ret;
 117                 ret = for_each_line_ro(playlist_def.data, playlist_def.size,
 118                         check_playlist_path, pb);
 119         }
 120         osl_close_disk_object(&playlist_def);
 121         return ret;
 122 }
 123
 124 /**
 125  * Check the playlist table for inconsistencies.
 126  *
 127  * \param fd The afs socket.
 128  * \param query Unused.
 129  *
 130  * \return The return value of the underlying call to osl_rbtree_loop().
 131  */
 132 void playlist_check_callback(int fd, __a_unused const struct osl_object *query)
 133 {
 134         struct para_buffer pb = {
 135                 .max_size = shm_get_shmmax(),
 136                 .private_data = &(struct afs_max_size_handler_data) {
 137                         .fd = fd,
 138                         .band = SBD_OUTPUT
 139                 },
 140                 .max_size_handler = afs_max_size_handler,
 141         };
 142         int ret = para_printf(&pb, "checking playlists...\n");
 143
 144         if (ret < 0)
 145                 return;
 146         osl_rbtree_loop(playlists_table, BLOBCOL_ID, &pb,
 147                 check_playlist);
 148         if (pb.offset)
 149                 pass_buffer_as_shm(fd, SBD_OUTPUT, pb.buf, pb.offset);
 150         free(pb.buf);
 151 }
 152
 153 /**
 154  * Close the current playlist.
 155  *
 156  * \sa playlist_open().
 157  */
 158 void playlist_close(void)
 159 {
 160         if (!current_playlist.name)
 161                 return;
 162         free(current_playlist.name);
 163         current_playlist.name = NULL;
 164 }
 165
 166 /**
 167  * Open the given playlist.
 168  *
 169  * \param name The name of the playlist to open.
 170  *
 171  * Files which are listed in the playlist, but not contained in the database
 172  * are ignored.  This is not considered an error.
 173  *
 174  * \return Standard.
 175  */
 176 int playlist_open(char *name)
 177 {
 178         struct osl_object obj;
 179         int ret;
 180         struct osl_row *row;
 181
 182         obj.data = name;
 183         obj.size = strlen(obj.data);
 184         ret = osl(osl_get_row(playlists_table, BLOBCOL_NAME, &obj, &row));
 185         if (ret < 0) {
 186                 PARA_NOTICE_LOG("failed to load playlist %s\n", name);
 187                 return ret;
 188         }
 189         playlist_close();
 190         ret = load_playlist(row, &current_playlist);
 191         return (ret == -E_PLAYLIST_LOADED)? current_playlist.length : ret;
 192 }
 193
 194 static int search_path(char *path, void *data)
 195 {
 196         if (strcmp(path, data))
 197                 return 1;
 198         return -E_PATH_FOUND;
 199 }
 200
 201 static int handle_audio_file_event(enum afs_events event, void *data)
 202 {
 203         int ret, was_admissible = 0, is_admissible;
 204         struct osl_object playlist_def;
 205         char *new_path;
 206         const struct osl_row *row = data;
 207
 208         if (!current_playlist.name)
 209                 return 1;
 210         if (event == AUDIO_FILE_RENAME) {
 211                 ret = row_belongs_to_score_table(row, NULL);
 212                 if (ret < 0)
 213                         return ret;
 214                 was_admissible = ret;
 215         }
 216         ret = get_audio_file_path_of_row(row, &new_path);
 217         if (ret < 0)
 218                 return ret;
 219         ret = pl_get_def_by_name(current_playlist.name, &playlist_def);
 220         if (ret < 0)
 221                 return ret;
 222         ret = for_each_line_ro(playlist_def.data, playlist_def.size,
 223                 search_path, new_path);
 224         osl_close_disk_object(&playlist_def);
 225         is_admissible = (ret < 0);
 226         if (was_admissible && is_admissible)
 227                 return 1;
 228         if (!was_admissible && !is_admissible)
 229                 return 1;
 230         if (was_admissible && !is_admissible) {
 231                 current_playlist.length--;
 232                 return score_delete(row);
 233         }
 234         /* !was_admissible && is_admissible */
 235         current_playlist.length++;
 236         return score_add(row, 0); /* play it immediately */
 237 }
 238
 239 /**
 240  * Handle afs events relevant to playlists.
 241  *
 242  * \param event The event type.
 243  * \param pb Unused.
 244  * \param data Depends on the event type.
 245  *
 246  * \return Standard.
 247  */
 248 int playlists_event_handler(enum afs_events event,
 249         __a_unused struct para_buffer *pb, void *data)
 250 {
 251         int ret;
 252         struct afsi_change_event_data *aced = data;
 253
 254         switch(event) {
 255         case AFSI_CHANGE:
 256                 return playlist_update_audio_file(aced->aft_row);
 257         case AUDIO_FILE_RENAME:
 258         case AUDIO_FILE_ADD:
 259                 return handle_audio_file_event(event, data);
 260         case AUDIO_FILE_REMOVE:
 261                 ret = row_belongs_to_score_table(data, NULL);
 262                 if (ret < 0)
 263                         return ret;
 264                 if (!ret)
 265                         return 1;
 266                 current_playlist.length--;
 267                 return score_delete(data);
 268         default:
 269                 return 1;
 270         }
 271 }