static Track()
{
Tones = new Tone[Constants.MaxToneCount];
FreqTable = Enumerable.Range(0, 128).Select(GetFreq).ToArray();
AudioTimers = new AudioTimer[Constants.MaxToneCount];
for (var i = 0; i < AudioTimers.Length; i++)
{
AudioTimers[i] = new AudioTimer();
}
}
public (short, short) Process(int index, int sampleRate)
{
Tone t = Tones[index];
AudioTimer at = AudioTimers[index];
(short, short)output = (0, 0);
if (t == null)
{
return(output);
}
IInstrument il;
il = t.Channel == 9 ? GetDrumsets().FindInstruments(t.NoteNum, t.Velocity).FirstOrDefault() : GetCurrentInstrument();
if (il == null)
{
return(output);
}
var panrt = Channel.Panpot * 0.0078f;
var a = 4f / Tones.Length;
if (t.Channel == 9)
{
a *= 2;
}
var kake = (Channel.Volume * 0.0078f) * (Channel.Expression * 0.0078f) * (t.Velocity * 0.0078f) * a;
var freq = FreqTable[t.NoteNum] * Channel.FreqExts;
t.Frequency = (int)freq;
if (t.Channel == 9)
{
freq = 441 * Channel.FreqExts;
}
at.SetCycle(freq, sampleRate);
output = il.Source.GetSample(t.SampleTick, sampleRate, t);
output.Item1 = (short)(output.Item1 * kake * (1 - panrt));
output.Item2 = (short)(output.Item2 * kake * panrt);
t.SampleTick = (int)at.Update();
return(output);
}