/*
Compressor:
threshold: slider1 (-3dB)
ratio: slider2
attack: slider3
release: slider4
rms: slider5

Limiter:
threshold: slider1
release: slider4
ceiling: slider6
*/

slider1:0<-30,0,0.1>Threshold (dB)
slider2:4<1,20,0.1>Ratio
slider3:3<1,20,0.1>Attack (ms)
slider4:100<20,1000,1>Release (ms)
slider5:5<0,100,1>RMS (ms)
slider6:0<-12,0,0.1>Ceiling (dB)

in_pin:L in
in_pin:R in
out_pin:L out
out_pin:R out

@init
output = 1;
transfer_AA = 0;
transfer_BA = 1;
transfer_AB = 0;
transfer_BB = 1;
gainA = 1;
gainB = 1;
envA = 0;
envB = 0;

attackB = exp(-1/(0.004/1000*srate));
envelope_decayA = exp(-1/(100/1000*srate));
envelope_decayB = exp(-1/(50/1000*srate));

log2dB = 8.6858896380650365530225783783321;
db2log = 0.11512925464970228420089957273422;
gr_meterA = 1;
gr_meterB = 1;
gr_meter_decay = exp(1/(1*srate));

@slider
thresholdA = 10^((slider1-3)/20);
thresholdB = 10^(slider1/20);

transfer_AA = (1/slider2)-1;
transfer_BA = output * pow(thresholdA,-transfer_AA);
transfer_AB = -1;
transfer_BB = output * pow(thresholdB,-transfer_AB);

attackA = exp(-1/(slider3/1000*srate));
release = exp(-1/(slider4/1000*srate));
rmstime = max(min(slider5/1000,0.1),0.00004);
rms = exp(-1/(rmstime * srate));

ceiling = 10^(slider6/20);
vol = ceiling/thresholdB;

@sample
in0 = spl0;
in1 = spl1;

slider5>0 ? (
ave = in0*in0 + in1*in1;
runave = ave + rms * (runave - ave);
detA = sqrt(runave);
):(
ave = 0;
detA = max(abs(in0),abs(in1));
);

detA += 0.000000000001;
envA = detA >= envA ? detA : detA+envelope_decayA*(envA-detA);
transfer_gainA = envA > thresholdA ? pow(envA,transfer_AA)*transfer_BA:output;
gainA = transfer_gainA < gainA ? transfer_gainA+attackA*(gainA-transfer_gainA) : transfer_gainA+release*(gainA-transfer_gainA);

out0 = in0 * gainA;
out1 = in1 * gainA;

detB = max(abs(out0),abs(out1));
envB = detB >= envB ? detB : detB+envelope_decayB*(envB-detB);
transfer_gainB = envB > thresholdB ? pow(envB,transfer_AB)*transfer_BB:output;
gainB = transfer_gainB < gainB ? transfer_gainB+attackB*(gainB-transfer_gainB) : transfer_gainB+release*(gainB-transfer_gainB);

spl0 = out0 * gainB * vol;
spl1 = out1 * gainB * vol;

grA = log(gainA)*log2dB;
grvA = exp(grA*db2log);
grvA < gr_meterA ? gr_meterA=grvA : ( gr_meterA*=gr_meter_decay; gr_meterA>1?gr_meterA=1; );
grminA = min( min(grA,grA) , grminA);

grB = log(gainB)*log2dB;
grvB = exp(grB*db2log);
grvB < gr_meterB ? gr_meterB=grvB : ( gr_meterB*=gr_meter_decay; gr_meterB>1?gr_meterB=1; );
grminB = min( min(grB,grB) , grminB);

@gfx 0 36
gfx_a=0.8;

meter_bot=21;
meter_h=min(gfx_h,gfx_h-4);
xscale=gfx_w*20/meter_bot;

gfx_r=1; gfx_g=gfx_b=0;
gfx_y=0;
gfx_x=gfx_w + log10(gr_meterA)*xscale;
gfx_rectto(gfx_w,meter_h/2);

gfx_r=1; gfx_g=0.5; gfx_b=0;
gfx_y=meter_h/2;
gfx_x=gfx_w + log10(gr_meterB)*xscale;
gfx_rectto(gfx_w,meter_h);

gfx_r=gfx_g=gfx_b=1; gfx_a=0.6;

s2=sqrt(2)/2;
g = s2;
while(
gfx_x=gfx_w + log10(g)*xscale;
gfx_x >= 0 ? (
gfx_y=0;
gfx_lineto(gfx_x,meter_h,0);
gfx_y=meter_h-gfx_texth;
gfx_x+=2;
gfx_drawnumber(log10(g)*20,0);
gfx_drawchar($'d');
gfx_drawchar($'B');
);
g*=s2;
gfx_x >=0;
);

(mouse_cap) ? (grminA=grminB=0;);
gfx_x=2; gfx_y=0.5*meter_h/2 - gfx_texth/2;
gfx_drawnumber(grminA,1);
gfx_x=2; gfx_y=1.5*meter_h/2 - gfx_texth/2;
gfx_drawnumber(grminB,1);
