public static int GetTotalPlayTimeMilliseconds(IList <SmfMessage> messages, int deltaTimeSpec)
{
if (deltaTimeSpec < 0)
{
throw new NotSupportedException("non-tick based DeltaTime");
}
else
{
int tempo = SmfMetaType.DefaultTempo;
int v = 0;
foreach (var m in messages)
{
v += (int)(tempo / 1000 * m.DeltaTime / deltaTimeSpec);
if (m.Event.EventType == SmfEvent.Meta && m.Event.Msb == SmfMetaType.Tempo)
{
tempo = SmfMetaType.GetTempo(m.Event.Data);
}
}
return(v);
}
}
public virtual void HandleEvent(SmfMessage m)
{
if (m.DeltaTime != 0)
{
var ms = GetDeltaTimeInMilliseconds(m.DeltaTime);
time_manager.AdvanceBy(ms);
}
if (m.Event.StatusByte == 0xFF)
{
if (m.Event.Msb == SmfMetaType.Tempo)
{
current_tempo = SmfMetaType.GetTempo(m.Event.Data);
}
else if (m.Event.Msb == SmfMetaType.TimeSignature && m.Event.Data.Length == 4)
{
Array.Copy(m.Event.Data, current_time_signature, 4);
}
}
OnEvent(m.Event);
PlayDeltaTime += m.DeltaTime;
}