108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
#pragma once
|
|
#include <cstdlib>
|
|
#include <stdint.h>
|
|
|
|
namespace trnr {
|
|
// soft clipper based on ClipSoftly by Chris Johnson
|
|
class aw_clipsoftly {
|
|
public:
|
|
aw_clipsoftly()
|
|
{
|
|
samplerate = 44100;
|
|
|
|
lastSampleL = 0.0;
|
|
lastSampleR = 0.0;
|
|
for (int x = 0; x < 16; x++) {
|
|
intermediateL[x] = 0.0;
|
|
intermediateR[x] = 0.0;
|
|
}
|
|
fpdL = 1.0;
|
|
while (fpdL < 16386) fpdL = rand() * UINT32_MAX;
|
|
fpdR = 1.0;
|
|
while (fpdR < 16386) fpdR = rand() * UINT32_MAX;
|
|
// this is reset: values being initialized only once. Startup values, whatever they are.
|
|
}
|
|
|
|
void set_samplerate(double _samplerate) { samplerate = _samplerate; }
|
|
|
|
void process_block(double** inputs, double** outputs, long sample_frames)
|
|
{
|
|
double* in1 = inputs[0];
|
|
double* in2 = inputs[1];
|
|
double* out1 = outputs[0];
|
|
double* out2 = outputs[1];
|
|
|
|
double overallscale = 1.0;
|
|
overallscale /= 44100.0;
|
|
overallscale *= samplerate;
|
|
int spacing = floor(overallscale); // should give us working basic scaling, usually 2 or 4
|
|
if (spacing < 1) spacing = 1;
|
|
if (spacing > 16) spacing = 16;
|
|
|
|
while (--sample_frames >= 0) {
|
|
double inputSampleL = *in1;
|
|
double inputSampleR = *in2;
|
|
if (fabs(inputSampleL) < 1.18e-23) inputSampleL = fpdL * 1.18e-17;
|
|
if (fabs(inputSampleR) < 1.18e-23) inputSampleR = fpdR * 1.18e-17;
|
|
|
|
double softSpeed = fabs(inputSampleL);
|
|
if (softSpeed < 1.0) softSpeed = 1.0;
|
|
else softSpeed = 1.0 / softSpeed;
|
|
if (inputSampleL > 1.57079633) inputSampleL = 1.57079633;
|
|
if (inputSampleL < -1.57079633) inputSampleL = -1.57079633;
|
|
inputSampleL = sin(inputSampleL) * 0.9549925859; // scale to what cliponly uses
|
|
inputSampleL = (inputSampleL * softSpeed) + (lastSampleL * (1.0 - softSpeed));
|
|
|
|
softSpeed = fabs(inputSampleR);
|
|
if (softSpeed < 1.0) softSpeed = 1.0;
|
|
else softSpeed = 1.0 / softSpeed;
|
|
if (inputSampleR > 1.57079633) inputSampleR = 1.57079633;
|
|
if (inputSampleR < -1.57079633) inputSampleR = -1.57079633;
|
|
inputSampleR = sin(inputSampleR) * 0.9549925859; // scale to what cliponly uses
|
|
inputSampleR = (inputSampleR * softSpeed) + (lastSampleR * (1.0 - softSpeed));
|
|
|
|
intermediateL[spacing] = inputSampleL;
|
|
inputSampleL = lastSampleL; // Latency is however many samples equals one 44.1k sample
|
|
for (int x = spacing; x > 0; x--) intermediateL[x - 1] = intermediateL[x];
|
|
lastSampleL = intermediateL[0]; // run a little buffer to handle this
|
|
|
|
intermediateR[spacing] = inputSampleR;
|
|
inputSampleR = lastSampleR; // Latency is however many samples equals one 44.1k sample
|
|
for (int x = spacing; x > 0; x--) intermediateR[x - 1] = intermediateR[x];
|
|
lastSampleR = intermediateR[0]; // run a little buffer to handle this
|
|
|
|
// begin 64 bit stereo floating point dither
|
|
// int expon; frexp((double)inputSampleL, &expon);
|
|
fpdL ^= fpdL << 13;
|
|
fpdL ^= fpdL >> 17;
|
|
fpdL ^= fpdL << 5;
|
|
// inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
|
|
// frexp((double)inputSampleR, &expon);
|
|
fpdR ^= fpdR << 13;
|
|
fpdR ^= fpdR >> 17;
|
|
fpdR ^= fpdR << 5;
|
|
// inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
|
|
// end 64 bit stereo floating point dither
|
|
|
|
*out1 = inputSampleL;
|
|
*out2 = inputSampleR;
|
|
|
|
in1++;
|
|
in2++;
|
|
out1++;
|
|
out2++;
|
|
}
|
|
}
|
|
|
|
private:
|
|
double samplerate;
|
|
|
|
double lastSampleL;
|
|
double intermediateL[16];
|
|
double lastSampleR;
|
|
double intermediateR[16];
|
|
uint32_t fpdL;
|
|
uint32_t fpdR;
|
|
// default stuff
|
|
};
|
|
} // namespace trnr
|