MidiSequence _ProcessTrack(MidiSequence trk)
{
var ofs = (int)OffsetUpDown.Value;
var len = (int)LengthUpDown.Value;
if (0 == UnitsCombo.SelectedIndex) // beats
{
len = (int)Math.Min(Math.Ceiling(len * (decimal)_file.TimeBase), _file.Length);
ofs = (int)Math.Min(Math.Ceiling(ofs * (decimal)_file.TimeBase), _file.Length);
}
switch (StartCombo.SelectedIndex)
{
case 1:
ofs += _file.FirstDownBeat;
break;
case 2:
ofs += _file.FirstNoteOn;
break;
}
switch (StartCombo.SelectedIndex)
{
case 1:
ofs += _file.FirstDownBeat;
break;
case 2:
ofs += _file.FirstNoteOn;
break;
}
if (0 != ofs && CopyTimingPatchCheckBox.Checked)
{
var end = trk.FirstNoteOn;
if (0 == end)
{
end = trk.Length;
}
var trk2 = trk.GetRange(ofs, len);
var ins = 0;
for (int ic = trk.Events.Count, i = 0; i < ic; ++i)
{
var ev = trk.Events[i];
if (ev.Position >= end)
{
break;
}
var m = ev.Message;
switch (m.Status)
{
case 0xFF:
var mm = m as MidiMessageMeta;
switch (mm.Data1)
{
case 0x51:
case 0x54:
trk2.Events.Insert(ins, ev.Clone());
++ins;
break;
}
break;
default:
if (0xC0 == (ev.Message.Status & 0xF0))
{
trk2.Events.Insert(ins, ev.Clone());
++ins;
}
break;
}
}
trk = trk2;
}
else
{
if (trk.Length != len || 0 != ofs)
{
trk = trk.GetRange(ofs, len);
}
}
if (1m != StretchUpDown.Value)
{
trk = trk.Stretch((double)StretchUpDown.Value, AdjustTempoCheckBox.Checked);
}
return(trk);
}
