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
  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 = shm_get_shmmax(),
 135                 .private_data = &(struct afs_max_size_handler_data) {
 136                         .fd = fd,
 137                 },
 138                 .max_size_handler = afs_max_size_handler,
 139         };
 140         int ret = para_printf(&pb, "checking playlists...\n");
 141
 142         if (ret < 0)
 143                 return;
 144         osl_rbtree_loop(playlists_table, BLOBCOL_ID, &pb,
 145                 check_playlist);
 146         if (pb.offset)
 147                 pass_buffer_as_shm(fd, pb.buf, pb.offset);
 148         free(pb.buf);
 149 }
 150
 151 /**
 152  * Close the current playlist.
 153  *
 154  * \sa playlist_open().
 155  */
 156 void playlist_close(void)
 157 {
 158         if (!current_playlist.name)
 159                 return;
 160         free(current_playlist.name);
 161         current_playlist.name = NULL;
 162 }
 163
 164 /**
 165  * Open the given playlist.
 166  *
 167  * \param name The name of the playlist to open.
 168  *
 169  * Files which are listed in the playlist, but not contained in the database
 170  * are ignored.  This is not considered an error.
 171  *
 172  * \return Standard.
 173  */
 174 int playlist_open(char *name)
 175 {
 176         struct osl_object obj;
 177         int ret;
 178         struct osl_row *row;
 179
 180         obj.data = name;
 181         obj.size = strlen(obj.data);
 182         ret = osl(osl_get_row(playlists_table, BLOBCOL_NAME, &obj, &row));
 183         if (ret < 0) {
 184                 PARA_NOTICE_LOG("failed to load playlist %s\n", name);
 185                 return ret;
 186         }
 187         playlist_close();
 188         ret = load_playlist(row, &current_playlist);
 189         return (ret == -E_PLAYLIST_LOADED)? current_playlist.length : ret;
 190 }
 191
 192 static int search_path(char *path, void *data)
 193 {
 194         if (strcmp(path, data))
 195                 return 1;
 196         return -E_PATH_FOUND;
 197 }
 198
 199 static int handle_audio_file_event(enum afs_events event, void *data)
 200 {
 201         int ret, was_admissible = 0, is_admissible;
 202         struct osl_object playlist_def;
 203         char *new_path;
 204         const struct osl_row *row = data;
 205
 206         if (!current_playlist.name)
 207                 return 1;
 208         if (event == AUDIO_FILE_RENAME) {
 209                 ret = row_belongs_to_score_table(row, NULL);
 210                 if (ret < 0)
 211                         return ret;
 212                 was_admissible = ret;
 213         }
 214         ret = get_audio_file_path_of_row(row, &new_path);
 215         if (ret < 0)
 216                 return ret;
 217         ret = pl_get_def_by_name(current_playlist.name, &playlist_def);
 218         if (ret < 0)
 219                 return ret;
 220         ret = for_each_line_ro(playlist_def.data, playlist_def.size,
 221                 search_path, new_path);
 222         osl_close_disk_object(&playlist_def);
 223         is_admissible = (ret < 0);
 224         if (was_admissible && is_admissible)
 225                 return 1;
 226         if (!was_admissible && !is_admissible)
 227                 return 1;
 228         if (was_admissible && !is_admissible) {
 229                 current_playlist.length--;
 230                 return score_delete(row);
 231         }
 232         /* !was_admissible && is_admissible */
 233         current_playlist.length++;
 234         return score_add(row, 0); /* play it immediately */
 235 }
 236
 237 /**
 238  * Handle afs events relevant to playlists.
 239  *
 240  * \param event The event type.
 241  * \param pb Unused.
 242  * \param data Depends on the event type.
 243  *
 244  * \return Standard.
 245  */
 246 int playlists_event_handler(enum afs_events event,
 247         __a_unused struct para_buffer *pb, void *data)
 248 {
 249         int ret;
 250         struct afsi_change_event_data *aced = data;
 251
 252         switch(event) {
 253         case AFSI_CHANGE:
 254                 return playlist_update_audio_file(aced->aft_row);
 255         case AUDIO_FILE_RENAME:
 256         case AUDIO_FILE_ADD:
 257                 return handle_audio_file_event(event, data);
 258         case AUDIO_FILE_REMOVE:
 259                 ret = row_belongs_to_score_table(data, NULL);
 260                 if (ret < 0)
 261                         return ret;
 262                 if (!ret)
 263                         return 1;
 264                 current_playlist.length--;
 265                 return score_delete(data);
 266         default:
 267                 return 1;
 268         }
 269 }