private static ResourceSearchInstance Build(PlaylistDatabase database)
{
Log.Debug("Building suffix array...");
var timer = new Stopwatch();
timer.Start();
var loadMs = timer.ElapsedMilliseconds;
timer.Restart();
var inst = new ResourceSearchInstance(database.UniqueResources);
Log.Info($"Built suffix array (loading playlists {loadMs}ms, build {timer.ElapsedMilliseconds}ms)");
return(inst);
}
protected override Task RemoveSongInternal(int index)
{
return(TaskEx.Run(() => {
PlaylistDatabase.Delete(index);
if (index == Index)
{
PlaylistDatabase.SetIndex(NO_POSITION);
}
else if (index >= 0 && index < Index && Index > 0)
{
// A track has been removed from "above" the currently playing track,
// so the Index needs to adapt and move one step up, so that it continues
// to point at the same track.
PlaylistDatabase.SetIndex(Index - 1);
}
}));
}
public override async Task SetPlaylist(MusicItem song)
{
await TrySubmitDownload(song);
PlaylistDatabase.SetPlaylist(AudioConversions.ToPlaylistTrack(song));
}
protected override Task SendSkipCommand(int index)
{
PlaylistDatabase.SetIndex(index);
return(AsyncTasks.Noop());
}
public override async Task AddSongs(IEnumerable <MusicItem> songs)
{
await TrySubmitDownload(songs);
PlaylistDatabase.AddAll(songs.Select(AudioConversions.ToPlaylistTrack).ToList());
}
public override Task <PlaylistInfo> LoadPlaylist()
{
return(TaskEx.FromResult(PlaylistDatabase.TracksAndIndex()));
}
public ResourceSearch(PlaylistDatabase database)
{
Database = database;
Exchange(Build(database));
}
/// <summary>
/// Implements the logic to get the previous AudioTrack instance.
/// </summary>
/// <remarks>
/// The AudioTrack URI determines the source, which can be:
/// (a) Isolated-storage file (Relative URI, represents path in the isolated storage)
/// (b) HTTP URL (absolute URI)
/// (c) MediaStreamSource (null)
/// </remarks>
/// <returns>an instance of AudioTrack, or null if previous track is not allowed</returns>
private AudioTrack GetPreviousTrack()
{
return(ToAudioTrack(PlaylistDatabase.Previous()));
}
/// <summary>
/// Implements the logic to get the next AudioTrack instance.
/// In a playlist, the source can be from a file, a web request, etc.
/// </summary>
/// <remarks>
/// The AudioTrack URI determines the source, which can be:
/// (a) Isolated-storage file (Relative URI, represents path in the isolated storage)
/// (b) HTTP URL (absolute URI)
/// (c) MediaStreamSource (null)
/// </remarks>
/// <returns>an instance of AudioTrack, or null if the playback is completed</returns>
private AudioTrack GetNextTrack()
{
return(ToAudioTrack(PlaylistDatabase.Next()));
}
