public bool Start(ISoundPreviewContext context, int startTick)
{
if (Playing)
{
throw new InvalidOperationException();
}
if (context == null)
{
throw new ArgumentNullException("context");
}
PreviewContext = context;
SoundManager.Register(context.ClapSource.FilePath);
SoundManager.Register(context.MusicSource.FilePath);
var timeCalculator = new TimeCalculator(context.TicksPerBeat, context.BpmDefinitions);
var ticks = new SortedSet <int>(context.GetGuideTicks()).ToList();
TickElement = new LinkedList <int?>(ticks.Where(p => p >= startTick).OrderBy(p => p).Select(p => new int?(p))).First;
BpmElement = new LinkedList <BpmChangeEvent>(context.BpmDefinitions.OrderBy(p => p.Tick)).First;
EndTick = IsStopAtLastNote ? ticks[ticks.Count - 1] : timeCalculator.GetTickFromTime(SoundManager.GetDuration(context.MusicSource.FilePath));
if (EndTick < startTick)
{
return(false);
}
// スタート時まで進める
while (TickElement != null && TickElement.Value < startTick)
{
TickElement = TickElement.Next;
}
while (BpmElement.Next != null && BpmElement.Next.Value.Tick <= startTick)
{
BpmElement = BpmElement.Next;
}
int clapLatencyTick = GetLatencyTick(context.ClapSource.Latency, BpmElement.Value.Bpm);
InitialTick = startTick - clapLatencyTick;
CurrentTick = InitialTick;
StartTick = startTick;
double startTime = timeCalculator.GetTimeFromTick(startTick);
double headGap = Math.Max(-context.MusicSource.Latency - startTime, 0);
elapsedTick = 0;
Task.Run(() =>
{
LastSystemTick = Environment.TickCount;
SyncControl.Invoke((MethodInvoker)(() => Timer.Start()));
System.Threading.Thread.Sleep(TimeSpan.FromSeconds(Math.Max((context.ClapSource.Latency + headGap) / context.Speed, 0)));
if (!Playing)
{
return;
}
SoundManager.Play(context.MusicSource.FilePath, startTime + context.MusicSource.Latency, context.MusicSource.Volume, context.Speed);
})
.ContinueWith(p =>
{
if (p.Exception != null)
{
Program.DumpExceptionTo(p.Exception, "sound_exception.json");
ExceptionThrown?.Invoke(this, EventArgs.Empty);
}
});
Playing = true;
Started?.Invoke(this, EventArgs.Empty);
return(true);
}