static void Main2(string[] args)
{
using (var stdout = /*Console.OpenStandardOutput()*/ File.Open("./out2.raw", FileMode.Create))
{
int sampleRate = 44100;
int waveformSampleCount = 44100 << 10;
double[] waveform = GenerateSaw(waveformSampleCount);
//double[] waveform2 = GenerateSaw(waveformSampleCount/2);
//double[] waveform3 = GenerateSaw(waveformSampleCount/4);
//double[] waveform4 = GenerateSaw(waveformSampleCount/8);
SampleFilter sf = new SampleFilter();
double phase = 0;
double frequency = 110;
double volume = 1f;
bool increased = false;
double freqMult = 1.00001f;
//double freqMult = 1.1f;
int run = 0;
while (frequency < 20000)
{
//var sample = BitConverter.GetBytes((Int16)(waveform[(int)(phase * waveformSampleCount)] * volume));
double sample;
double realIndex = (phase * waveformSampleCount) + (NextDither() * 1000000);
int intIndex = (int)Math.Round(realIndex);
if (intIndex < 0)
{
intIndex = -intIndex;
}
intIndex %= waveformSampleCount;
int intIndexNext = (intIndex + 1) % waveformSampleCount;
sample = waveform[intIndex];
var sample2 = waveform[intIndexNext];
double interpolationPercent = (realIndex - (int)realIndex);
double delta = sample2 - sample;
double increment = delta * interpolationPercent;
sample = sample + increment;
var dither = NextDither();
// if(frequency < sampleRate / 2)
// sample = waveform[(int)(phase * waveformSampleCount)] * volume;
// else if(frequency < (sampleRate / 2) + (sampleRate / 4))
// sample = waveform2[(int)(phase * waveformSampleCount / 2)] * volume;
// else if(frequency < (sampleRate / 2) + (sampleRate / 4) + (sampleRate / 8))
// sample = waveform3[(int)(phase * waveformSampleCount / 4)] * volume;
// else
// sample = waveform4[(int)(phase * waveformSampleCount / 8)] * volume;
//if(run > 2185)
// run = run;
//FirFilter.Put(sf, sample);
//sample = FirFilter.Get(sf) * 0.8;
stdout.Write(BitConverter.GetBytes((Int16)(((sample * volume) * Int16.MaxValue) + dither)), 0, 2);
stdout.Write(BitConverter.GetBytes((Int16)(((sample * volume) * Int16.MaxValue) + dither)), 0, 2);
//stdout.Write(BitConverter.GetBytes(sample), 0, 8);
//stdout.Write(BitConverter.GetBytes(sample), 0, 8);
//Console.WriteLine(waveform[(int)(phase * waveformSampleCount)]);
phase += frequency / sampleRate;
if (phase >= 1)
{
phase -= (int)phase;
}
//if(phase >= 1)
// phase = 0;
//if(run > 0 && (run % 44100) == 0)
frequency *= freqMult;
//if(frequency >= 19000 || frequency <= 5)
// freqMult = 1/freqMult;
/*if(!increased && frequency > 5000)
* {
* volume = 1;
* increased = true;
* }*/
run++;
}
// int sampleRate = 44100;
// float phaseL = 0;
// float frequencyL = (float)(20 * 2 * Math.PI);
// float phaseR = 0;
// float frequencyR = (float)(20 * 2 * Math.PI);
// while(true)
// {
// stdout.Write(BitConverter.GetBytes((Int16)(Math.Sin(phaseL) * Int16.MaxValue)), 0, 2);
// stdout.Write(BitConverter.GetBytes((Int16)(Math.Sin(phaseR) * Int16.MaxValue)), 0, 2);
// phaseL += (frequencyL / sampleRate);
// phaseR += (frequencyR / sampleRate);
// if(phaseL >= 2 * Math.PI)
// phaseL -= (float)(2 * Math.PI);
// if(phaseR >= 2 * Math.PI)
// phaseR -= (float)(2 * Math.PI);
// frequencyL += 0.009f;
// frequencyR += 0.005f;
// }
}
}