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AR: new freq scaling option "square root"

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also looks nice. It's a compromise between log() and linear. OK enough tinkering for today :-)
This commit is contained in:
Frank 2022-08-19 16:11:50 +02:00
parent 3c57e2e2b9
commit b8db47e528
1 changed files with 22 additions and 8 deletions
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28
usermods/audioreactive/audio_reactive.h
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@ -325,27 +325,40 @@ void FFTcode(void * parameter)
else
currentResult = fftCalc[i];
if (FFTScalingMode > 0) {
if (FFTScalingMode == 1) {
switch (FFTScalingMode) {
case 1:
// Logarithmic scaling
currentResult *= 0.42; // 42 is the answer ;-)
currentResult -= 8.0; // this skips the lowest row, giving some room for peaks
if (currentResult > 1.0)
currentResult = logf(currentResult); // log to base "e", which is the fastest log() function
else currentResult = 0.0; // special handling, because log(1) = 0; log(0) = undefined
currentResult *= 0.85f + (float(i)/18.0f); // extra up-scaling for high frequencies
currentResult = mapf(currentResult, 0, LOG_256, 0, 255); // map [log(1) ... log(255)] to [0 ... 255]
} else {
break;
case 2:
// Linear scaling
currentResult *= 0.30f; // needs a bit more damping, get stay below 255
currentResult -= 4.0; // giving a bit more room for peaks
if (currentResult < 1.0f) currentResult = 0.0f;
currentResult *= 0.85f + (float(i)/1.8f); // extra up-scaling for high frequencies
}
} else {
break;
case 3:
// square root scaling
currentResult *= 0.38f;
currentResult -= 6.0f;
if (currentResult > 1.0)
currentResult = sqrtf(currentResult);
else currentResult = 0.0; // special handling, because sqrt(0) = undefined
currentResult *= 0.85f + (float(i)/5.0f); // extra up-scaling for high frequencies
currentResult = mapf(currentResult, 0.0, 16.0, 0.0, 255.0); // map [sqrt(1) ... sqrt(256)] to [0 ... 255]
break;
case 0:
default:
// no scaling - leave freq bins as-is
currentResult -= 4; // just a bit more room for peaks
break;
}
// Now, let's dump it all into fftResult. Need to do this, otherwise other routines might grab fftResult values prematurely.
@ -1538,6 +1551,7 @@ class AudioReactive : public Usermod {
oappend(SET_F("dd=addDropdown('AudioReactive','Frequency:Scale');"));
oappend(SET_F("addOption(dd,'None',0);"));
oappend(SET_F("addOption(dd,'Linear (Amplitude)',2);"));
oappend(SET_F("addOption(dd,'Square Root (Energy)',3);"));
oappend(SET_F("addOption(dd,'Logarithmic (Loudness)',1);"));
oappend(SET_F("dd=addDropdown('AudioReactive','sync:mode');"));