PC World 2008 February/PCWorld_2008-02_cd.bin/audio-video/reaper/reaper2028-install.exe/Effects/Till/Transient-driven Auto-Pan v1.1 (Master)

Text File | 2007-12-03 | 7KB | 313 lines

// written by Till
//
// note: the effect sends data to regx. x is specified by the "send pan data to" slider
//
// note: the lookahead must be compensated manually in REAPER versions < 2
//
//
//
desc: Transient-driven Auto-Pan (Master)
slider1:0<0,2,1{Stereo,Left,Right}>Input
slider2:3<0,3,1{Left to Right,Right to Left,Bounce,Random (Ignores Pan/Random step size)}>Pan Mode
slider3:10<0,100,1>Pan step size (%)
slider4:0<0,100,1>Random step size (% +/-)
slider5:100<1,100,1>Max. Pan
slider6:20<0,1000,1>Fade time (ms)
slider7:0<0,10,1>Sloppiness (Master-only)
slider8:250<20,500,1>Min. pause between Pans (ms)
slider9:0<0,10,1>Max Delay (ms)
slider11:0<0,5,1{Left+Right,Left,Right,Sidechain Left+Right,Sidechain Left,Sidechain Right}>Director
slider12:0<0,1,1{No,Yes}>Preview Director
slider13:5<0,10,.1>Sensitivity
slider14:0<0,100,1>Look-ahead (ms)
slider15:0<0,10,1{Off,reg00,reg01,reg02,reg03,reg04,reg05,reg06,reg07,reg08,reg09}>Send Pan data to
slider16:0<-100,100,1>Current Pan


/////////////////
///           ///
///  I N I T  ///
///           ///
/////////////////

@init

    log2 = log(2);
    sqrt2 = sqrt(2);

    curgain = 1;
    curgaindb = 0;
    splsincelastpan = 0;
    now = 0;
    curpan = 0;
    sloppypan = 0;
    targetpan = 0;
    lastpan = 0;
    forth = 1;

    maxdelay = ceil((10 + 100) / 1000 * srate);

    delaybufferl = 0;
    delaybufferr = 2 * maxdelay;

    delaypointer = 0;

    rmswindow = 50 / 1000 * srate;
    rmsbuffer = 4 * maxdelay;

    rmssum = 0;
    rmsp = 0;

    pdc_bot_ch = 0;
    pdc_top_ch = 2;

/////////////////
///           ///
///  SLIDER   ///
///           ///
/////////////////

@slider

    // SLIDER VALUES

    input = slider1;

    mode = slider2;

    stepsize = slider3;
    randomstepsize = slider4;

    maxpan = slider5;

    fadetime = slider6 / 1000 * srate;
    sloppiness = slider7;

    pause = slider8 / 1000 * srate;

    delay = slider9 / 1000 * srate;

    director = slider11;

    preview = slider12;

    sensitivity = slider13;

    lookahead = slider14 / 1000 * srate;

    sendto = slider15;

    attack = max(1, sqr(sensitivity) * 0.003 * srate);
    release = max(1, pause / 2);

    tolerancedb = 12 - sensitivity;
    tolerance = 2 ^ (tolerancedb / 6);

    minrms = 2 ^ (-5 - sensitivity / 2);

    pdc_delay = lookahead;

/////////////////
///           ///
///  SAMPLE   ///
///           ///
/////////////////

@sample

    // choosing input

    input == 0 ? (
        l = spl0;
        r = spl1;
    ) : input == 1 ? (
        l = spl0;
        r = spl0;
    ) : input == 2 ? (
        l = spl1;
        r = spl1;
    ) : 0;

    // buffering

    delaybufferl[delaypointer] = l;
    delaybufferl[delaypointer + maxdelay] = l;
    delaybufferr[delaypointer] = r;
    delaybufferr[delaypointer + maxdelay] = r;

    // choosing director

    director == 0 ? (
        dl = spl0;
        dr = spl1;
    ) : director == 1 ? (
        dl = spl0;
        dr = spl0;
    ) : director == 2 ? (
        dl = spl1;
        dr = spl1;
    ) : director == 3 ? (
        dl = spl2;
        dr = spl3;
    ) : director == 4 ? (
        dl = spl2;
        dr = spl2;
    ) : director == 5 ? (
        dl = spl3;
        dr = spl3;
    ) : 0;

    cursample = (abs(dl) + abs(dr)) / 2;

// calcing rms power

    rmssum -= rmsbuffer[rmsp];

    rmssum += sqr(cursample);

    rmsbuffer[rmsp] = sqr(cursample);

    rms = max(sqrt(rmssum / rmswindow), minrms);

    rmsp+=1;
    rmsp >= rmswindow && rmsp = 0;

    threshold = rms * 1.68;
    thresholddb = 6 * log(threshold) / log2 + 3;

// detecting

    (cursample >= threshold) ? (
        cursampledb = 6 * log(cursample) / log2;
        targetgaindb = thresholddb - cursampledb;
    ) : (
        targetgaindb = 0;
    );

    targetgaindb > curgaindb ? (
        curgaindb += (targetgaindb - curgaindb) / release;
    ) : (
        curgaindb += (targetgaindb - curgaindb) / attack;
    );

    curgain = exp((curgaindb / 6) * log2);

    detector = cursample * curgain;

// panning

    pop = 0;
    now ? (
        (splsincelastpan > pause) && now = 0;
    ) : (
        detector > threshold * tolerance && (
            pop = 1;
            now = 1;
            splsincelastpan = 0;
            lastpan = curpan;
            mode == 0 ? (
                targetpan = curpan + stepsize + (rand(2) - 1) * randomstepsize;
                targetpan < -maxpan && (targetpan += 2 * maxpan);
                targetpan > maxpan && (targetpan -= 2 * maxpan);
            ) : mode == 1 ? (
                targetpan = curpan - stepsize - (rand(2) - 1) * randomstepsize;
                targetpan > maxpan && (targetpan -= 2 * maxpan);
                targetpan < -maxpan && (targetpan += 2 * maxpan);
            ) : mode == 2 ? (
                forth ? (
                    targetpan = curpan + stepsize + (rand(2) - 1) * randomstepsize;
                ) : (
                    targetpan = curpan - stepsize - (rand(2) - 1) * randomstepsize;
                );
                targetpan > maxpan && (
                    targetpan = 2 * maxpan - targetpan;
                    forth = 0;
                );
                targetpan < -maxpan && (
                    targetpan = - 2* maxpan - targetpan;
                    forth = 1;
                );
            ) : (
                targetpan = ceil((rand(2) - 1) * maxpan);
            );
        );
    );

    splsincelastpan += 1;

//fading the pan

    curpan != targetpan && (
        fadepos = splsincelastpan / fadetime;
        fadepos = (-cos(min(fadepos, 1) * $pi) + 1) / 2;
        curpan = lastpan + (targetpan - lastpan) * fadepos;
    );

// sending pan info

    sendto > 0 && (
        sendto == 1 ? (
            reg00 = curpan;
        ) : sendto == 2 ? (
            reg01 = curpan;
        ) : sendto == 3 ? (
            reg02 = curpan;
        ) : sendto == 4 ? (
            reg03 = curpan;
        ) : sendto == 5 ? (
            reg04 = curpan;
        ) : sendto == 6 ? (
            reg05 = curpan;
        ) : sendto == 7 ? (
            reg06 = curpan;
        ) : sendto == 8 ? (
            reg07 = curpan;
        ) : sendto == 9 ? (
            reg08 = curpan;
        ) : sendto == 10 ? (
            reg09 = curpan;
        ) : 0;
    );

// sloppiness

    s = sloppiness * sloppiness * sloppiness * sloppiness;
    sloppypan = (curpan + s * sloppypan) / (s + 1);

// calculating the actual volumes

    abspan = abs(sloppypan);
    dominantpandb = 6 * abspan / 100;
    dominantpan = exp((dominantpandb / 6) * log2);
    recessivepan = 2 - dominantpan;

// leveling

    sloppypan > 0 ? (
        r = dominantpan * delaybufferr[maxdelay + delaypointer - lookahead];
        x = abspan / 100 * delay;
        f = x - floor(x);
        c = floor(x + 1) - x;
        l = recessivepan * (c * delaybufferl[maxdelay + delaypointer - floor(abspan / 100 * delay) - lookahead] + f * delaybufferl[maxdelay + delaypointer - ceil(abspan / 100 * delay) - lookahead]);
    ) : (
        l = dominantpan * delaybufferl[maxdelay + delaypointer - lookahead];
        x = abspan / 100 * delay;
        f = x - floor(x);
        c = floor(x + 1) - x;
        r = recessivepan * (c * delaybufferr[maxdelay + delaypointer - floor(abspan / 100 * delay) - lookahead] + f * delaybufferr[maxdelay + delaypointer - ceil(abspan / 100 * delay) - lookahead]);
    );

// outputting

    preview ? (
        spl0 = dl;
        spl1 = pop;
    ) : (
        spl0 = l;
        spl1 = r;
    );

    slider16 = curpan;

    delaypointer += 1;
    delaypointer >= maxdelay && (delaypointer = 0);