Current time watching

To watch the current time of a playback you can create a timer and call GetCurrentTime method on each timer's tick. To simplify this task (especially if you're running multiple playbacks simultaneously) DryWetMIDI provides the PlaybackCurrentTimeWatcher class. This class is singleton in order to prevent creation of too many high resolution tick generators (which is not good since it can affect whole system performance). Please read Tick generator article to learn how you can adjust internals of the PlaybackCurrentTimeWatcher.

Small example:

PlaybackCurrentTimeWatcher.Instance.AddPlayback(playback, TimeSpanType.Midi);
PlaybackCurrentTimeWatcher.Instance.CurrentTimeChanged += OnCurrentTimeChanged;
PlaybackCurrentTimeWatcher.Instance.Start();

// ...

private static void OnCurrentTimeChanged(object sender, PlaybackCurrentTimeChangedEventArgs e)
{
    foreach (var playbackTime in e.Times)
    {
        var playback = playbackTime.Playback;
        var time = (MidiTimeSpan)playbackTime.Time;

        Console.WriteLine($"Current time is {time}.");
    }
}

In this example we watch the current time of playback and request to report time in MIDI format which is ticks (and thus we cast received time to MidiTimeSpan). You can set any desired time format and cast to corresponding implementation of the ITimeSpan.

You can add multiple different playbacks to watch their current times. When you don't want to watch playback anymore remove it from the watcher:

PlaybackCurrentTimeWatcher.Instance.RemovePlayback(playback);

By default polling interval of watcher is 100 ms, but you can alter it:

PlaybackCurrentTimeWatcher.Instance.PollingInterval = TimeSpan.FromMilliseconds(50);

Please don't set too small intervals. Polling interval defines how often the CurrentTimeChanged event will be fired. If you want to pause firing the event, call the Stop method.

When your application is about to close, dispose of watcher to kill the internal timer:

PlaybackCurrentTimeWatcher.Instance.Dispose();