eurorack/stereo_mix/processor.cc

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#include "processor.h"
#include "stmlib/stmlib.h"
#include <math.h>
using namespace stereo_mix;
const int kVolumeFilterValue = 4095;
void Processor::Process(int16_t cvs[], uint16_t* outs)
{
uint32_t value_l;
uint32_t value_r;
uint16_t pan_pot = (pan_offset + 32767L) >> (16 - 12); // adc is only 12 bit anyways
uint16_t vol_pot = (volume_offset) >> (16 - 12);
int16_t pan_cv = cvs[0] >> (16 - 12);
int16_t vol_cv = cvs[1] >> (16 - 12);
int32_t pan = pan_pot + pan_cv;
int32_t vol = vol_pot + vol_cv;
CONSTRAIN(pan, 0, (1 << 12) - 1);
CONSTRAIN(vol, 0, (1 << 12) - 1);
if (mute) {
vol = 0;
}
if (vol > previous_vol + kVolumeFilterValue) {
vol = previous_vol + kVolumeFilterValue;
} else if (vol < previous_vol - kVolumeFilterValue) {
vol = previous_vol - kVolumeFilterValue;
}
CONSTRAIN(pan, 0, (1 << 12) - 1);
CONSTRAIN(vol, 0, (1 << 12) - 1);
previous_vol = vol;
// leds.set_intensity(i, vol >> 4);
value_l = (lut_left_sin_pan[pan] * lut_linear_to_exp[vol]) >> 16;
value_r = (lut_right_cos_pan[pan] * lut_linear_to_exp[vol]) >> 16;
outs[0] = value_r;
outs[1] = value_l;
}