// (C) 2006, Michael Gruhn.

// NO WARRANTY IS GRANTED. THIS PLUG-IN IS PROVIDED ON AN "AS IS" BASIS, WITHOUT
// WARRANTY OF ANY KIND. NO LIABILITY IS GRANTED, INCLUDING, BUT NOT LIMITED TO,
// ANY DIRECT OR INDIRECT,  SPECIAL,  INCIDENTAL OR CONSEQUENTIAL DAMAGE ARISING
// OUT OF  THE  USE  OR INABILITY  TO  USE  THIS PLUG-IN,  COMPUTER FAILTURE  OF
// MALFUNCTION INCLUDED.  THE USE OF THE SOURCE CODE,  EITHER  PARTIALLY  OR  IN
// TOTAL, IS ONLY GRANTED,  IF USED IN THE SENSE OF THE AUTHOR'S INTENTION,  AND
// USED WITH ACKNOWLEDGEMENT OF THE AUTHOR. FURTHERMORE IS THIS PLUG-IN A  THIRD
// PARTY CONTRIBUTION,  EVEN IF INCLUDED IN REAPER(TM),  COCKOS INCORPORATED  OR
// ITS AFFILIATES HAVE NOTHING TO DO WITH IT.  LAST BUT NOT LEAST, BY USING THIS
// PLUG-IN YOU RELINQUISH YOUR CLAIM TO SUE IT'S AUTHOR, AS WELL AS THE CLAIM TO
// ENTRUST SOMEBODY ELSE WITH DOING SO.


// Also Useable For None Digital Drums ;)

desc:Digital Drum Compressor (DDC)
slider1:-20<-60,0,.1>Treshold (dB)
slider2:20<0,50,.1>Ratio
slider3:20<0,500,1>Attack (ms)
slider4:.5<0,500,.1>Hold (ms)
slider5:200<0,1000,1>Release (ms)
slider6:0<0,1000,1>RMS Size (ms) 
slider7:0<0,2,1{FF,FBQ,SIDECHAIN}>Feed
slider8:1<0,1,1{NO,YES}>Auto Make Up
slider9:0<-120,60,1>Output (dB)
slider10:0,REDUCTION (dB)

@init
gain = seekgain = 1;
c_ampdB = 8.65617025;

@slider
treshdB = min(slider1,-.1);
tresh = exp(treshdB/c_ampdB);
ratio_1 = ratio;
ratio = max(slider2,0.0001);

treshdB == -.1 || ratio_1 < .1  ? (gain = seekgain = 1; );

attack = exp( -treshdB/max( slider3*srate/1000 , 0) / c_ampdB  ) ;
hold = slider4/1000*srate;
under_tresh = 0;
release = exp( -treshdB/max( slider5*srate/1000 , 0) / c_ampdB ) ;

rms_size_1 = rms_size;
rms_size = min( max(slider6/1000*srate,1) , 1000000);
rms_size_1 != rms_size ? (
    rms_sqr_sum = rms_bpos = 0;
    memset(0,0,rms_size);
);

feed = slider7;

mode_make_up = ratio < .5 ? 1:slider8;

rms_size == 1 ? (
    volume = exp(slider9/c_ampdB) / (mode_make_up ? tresh+(1-tresh)/ratio : 1);
):(
    volume = exp(slider9/c_ampdB) / (mode_make_up ? tresh+(1-tresh)/ratio * 2.828427125 : 1);
);

seekgain = 1;

@sample
feed == 0 ? (maxsamples = max(abs(spl0),abs(spl1)); );
feed == 1 ? (maxsamples = max(abs(spl0_out),abs(spl1_out)); );
feed == 2 ? (maxsamples = max(abs(spl2),abs(spl3)); );

rms_sqr_sum = max(rms_sqr_sum - rms_bpos[0],0) + (rms_bpos[0] = sqr(maxsamples));
(rms_bpos+=1) >= rms_size ? rms_bpos=0;
rms = sqrt(rms_sqr_sum/rms_size);

rms > tresh ? (
    hold ?
    (
        ratio > 1 ? (
            seekgain = min( (tresh+(rms-tresh)/ratio)/rms ,seekgain );
        ):(
            seekgain = max( (tresh+(rms-tresh)/ratio)/rms ,seekgain );
        );
    ):(
        seekgain = (tresh+(rms-tresh)/ratio)/rms;
    );
    under_tresh = 0;
):(
    (under_tresh+=1)>hold ? (seekgain = 1; );
);


gain > seekgain ? gain=max(gain/attack,seekgain):gain=min(gain*release,seekgain);


spl0_out = (spl0 *= gain * volume) ;
spl1_out = (spl1 *= gain * volume) ;

slider10 = log(gain)*c_ampdB;
sliderchange(512);

