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SStillwell
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drumtrigger
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2006-08-14
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// drumtrigger: generates MIDI note information from audio impulses
// Copyright 2006, Thomas Scott Stillwell
// All rights reserved.
//
//Redistribution and use in source and binary forms, with or without modification, are permitted
//provided that the following conditions are met:
//
//Redistributions of source code must retain the above copyright notice, this list of conditions
//and the following disclaimer.
//
//Redistributions in binary form must reproduce the above copyright notice, this list of conditions
//and the following disclaimer in the documentation and/or other materials provided with the distribution.
//
//The name of Thomas Scott Stillwell may not be used to endorse or
//promote products derived from this software without specific prior written permission.
//
//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
//IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
//FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
//BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
//(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
//PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
//STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
//THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
desc:Turn audio signal into velocity-sensitive drum trigger
slider1:-17<-60,6,1>Open Threshold (dB)
slider2:-18<-60,6,1>Close Threshold (dB)
slider3:30<0,200,0.1>Retrigger interval (ms)
slider4:0<0,100,0.1>Original Signal Mix%;
slider5:10<1,16,1>MIDI Channel
slider6:69<0,255,1>MIDI Note#
slider7:1<0.1,7.0,0.1>Peak Det. Interval
slider8:1<-5.0,5.0,0.01>Trigger align (ms)
@init
sending=0;
sent=0;
noteon=9*16;
noteoff=8*16;
measuring=0;
meascnt=0;
maxvel=0;
triggerpos=0;
threshlat = 0.001 * srate;
@block
pos=0;
triggerpos=0;
@slider
othresh=2^(slider1/6);
cthresh=2^(slider2/6);
retrigger = (slider3 / 1000) * srate;
mix = slider4 / 100;
chan=slider5-1;
note=slider6;
velperiod=(slider7 / 1000) * srate;
threshlat=(slider8 / 1000) * srate;
oncmd=noteon+chan;
offcmd=noteoff+chan;
@sample
pos += 1;
trigwait += 1;
linvel=min(1,max(abs(spl0),abs(spl1)));
velocity=max(0,min(127,floor(maxvel*127)));
linvel >= othresh && sent==0 && sending==0 && measuring==0 && trigwait >= retrigger ? (
measuring=1;
maxvel=linvel;
meascnt=0;
triggerpos=pos;
);
measuring==1 ? (
meascnt += 1;
meascnt >= velperiod ? (
measuring=0;
sending=1;
meascnt=0;
) : (
maxvel=max(maxvel,linvel);
);
);
sent==0 && sending==1 ? (
sent=1;
sending=0;
trigwait=0;
midisend(max(0,triggerpos-threshlat), oncmd, note|velocity*256);
);
linvel <= cthresh && sent==1 && trigwait >= retrigger ? (
sent=0;
trigwait=0;
maxvel=0;
midisend(max(0,triggerpos-threshlat), offcmd, note);
);
spl0 = spl0 * mix;
spl1 = spl1 * mix;