public static int GetPlayTimeMillisecondsAtTick(IList <MidiMessage> messages, int ticks, int deltaTimeSpec)
{
if (deltaTimeSpec < 0)
{
throw new NotSupportedException("non-tick based DeltaTime");
}
else
{
int tempo = MidiMetaType.DefaultTempo;
int t = 0;
double v = 0;
foreach (var m in messages)
{
var deltaTime = t + m.DeltaTime < ticks ? m.DeltaTime : ticks - t;
v += (double)tempo / 1000 * deltaTime / deltaTimeSpec;
if (deltaTime != m.DeltaTime)
{
break;
}
t += m.DeltaTime;
if (m.Event.EventType == MidiEvent.Meta && m.Event.Msb == MidiMetaType.Tempo)
{
tempo = MidiMetaType.GetTempo(m.Event.ExtraData, m.Event.ExtraDataOffset);
}
}
return((int)v);
}
}
void ProcessMessage(MidiMessage m)
{
if (seek_processor != null)
{
var result = seek_processor.FilterMessage(m);
switch (result)
{
case SeekFilterResult.PassAndTerminate:
case SeekFilterResult.BlockAndTerminate:
seek_processor = null;
break;
}
switch (result)
{
case SeekFilterResult.Block:
case SeekFilterResult.BlockAndTerminate:
return; // ignore this event
}
}
else if (m.DeltaTime != 0)
{
var ms = GetContextDeltaTimeInMilliseconds(m.DeltaTime);
time_manager.WaitBy(ms);
play_delta_time += m.DeltaTime;
}
if (m.Event.StatusByte == 0xFF)
{
if (m.Event.Msb == MidiMetaType.Tempo)
{
current_tempo = MidiMetaType.GetTempo(m.Event.Data);
}
else if (m.Event.Msb == MidiMetaType.TimeSignature && m.Event.Data.Length == 4)
{
Array.Copy(m.Event.Data, current_time_signature, 4);
}
}
OnEvent(m.Event);
}
public static int GetTotalPlayTimeMilliseconds(IList <MidiMessage> messages, int deltaTimeSpec)
{
if (deltaTimeSpec < 0)
{
throw new NotSupportedException("non-tick based DeltaTime");
}
else
{
int tempo = MidiMetaType.DefaultTempo;
int v = 0;
foreach (var m in messages)
{
v += (int)(tempo / 1000 * m.DeltaTime / deltaTimeSpec);
if (m.Event.EventType == MidiEvent.Meta && m.Event.Msb == MidiMetaType.Tempo)
{
tempo = MidiMetaType.GetTempo(m.Event.Data);
}
}
return(v);
}
}
public virtual void HandleEvent(MidiMessage m)
{
if (m.DeltaTime != 0)
{
var ms = GetDeltaTimeInMilliseconds(m.DeltaTime);
time_manager.AdvanceBy(ms);
}
if (m.Event.StatusByte == 0xFF)
{
if (m.Event.Msb == MidiMetaType.Tempo)
{
current_tempo = MidiMetaType.GetTempo(m.Event.Data);
}
else if (m.Event.Msb == MidiMetaType.TimeSignature && m.Event.Data.Length == 4)
{
Array.Copy(m.Event.Data, current_time_signature, 4);
}
}
OnEvent(m.Event);
PlayDeltaTime += m.DeltaTime;
}
