/*
* File: AtmosphereBuss.cpp
*
* Version: 1.0
*
* Created: 3/10/18
*
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/*=============================================================================
AtmosphereBuss.cpp
=============================================================================*/
#include "AtmosphereBuss.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMPONENT_ENTRY(AtmosphereBuss)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// AtmosphereBuss::AtmosphereBuss
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
AtmosphereBuss::AtmosphereBuss(AudioUnit component)
: AUEffectBase(component)
{
CreateElements();
Globals()->UseIndexedParameters(kNumberOfParameters);
SetParameter(kParam_One, kDefaultValue_ParamOne );
#if AU_DEBUG_DISPATCHER
mDebugDispatcher = new AUDebugDispatcher (this);
#endif
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// AtmosphereBuss::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult AtmosphereBuss::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// AtmosphereBuss::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult AtmosphereBuss::GetParameterInfo(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
AudioUnitParameterInfo &outParameterInfo )
{
ComponentResult result = noErr;
outParameterInfo.flags = kAudioUnitParameterFlag_IsWritable
| kAudioUnitParameterFlag_IsReadable;
if (inScope == kAudioUnitScope_Global) {
switch(inParameterID)
{
case kParam_One:
AUBase::FillInParameterName (outParameterInfo, kParameterOneName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamOne;
break;
default:
result = kAudioUnitErr_InvalidParameter;
break;
}
} else {
result = kAudioUnitErr_InvalidParameter;
}
return result;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// AtmosphereBuss::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult AtmosphereBuss::GetPropertyInfo (AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
UInt32 & outDataSize,
Boolean & outWritable)
{
return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// AtmosphereBuss::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult AtmosphereBuss::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
// AtmosphereBuss::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult AtmosphereBuss::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____AtmosphereBussEffectKernel
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// AtmosphereBuss::AtmosphereBussKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void AtmosphereBuss::AtmosphereBussKernel::Reset()
{
gainchase = -90.0;
settingchase = -90.0;
chasespeed = 350.0;
fpNShape = 0.0;
lastSampleA = 0.0;
lastSampleB = 0.0;
lastSampleC = 0.0;
lastSampleD = 0.0;
lastSampleE = 0.0;
lastSampleF = 0.0;
lastSampleG = 0.0;
lastSampleH = 0.0;
lastSampleI = 0.0;
lastSampleJ = 0.0;
lastSampleK = 0.0;
lastSampleL = 0.0;
lastSampleM = 0.0;
thresholdA = 0.618033988749894;
thresholdB = 0.679837387624884;
thresholdC = 0.747821126387373;
thresholdD = 0.82260323902611;
thresholdE = 0.904863562928721;
thresholdF = 0.995349919221593;
thresholdG = 1.094884911143752;
thresholdH = 1.204373402258128;
thresholdI = 1.32481074248394;
thresholdJ = 1.457291816732335;
thresholdK = 1.603020998405568;
thresholdL = 1.763323098246125;
thresholdM = 1.939655408070737;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// AtmosphereBuss::AtmosphereBussKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void AtmosphereBuss::AtmosphereBussKernel::Process( const Float32 *inSourceP,
Float32 *inDestP,
UInt32 inFramesToProcess,
UInt32 inNumChannels,
bool &ioSilence )
{
UInt32 nSampleFrames = inFramesToProcess;
const Float32 *sourceP = inSourceP;
Float32 *destP = inDestP;
Float64 overallscale = 1.0;
overallscale /= 44100.0;
overallscale *= GetSampleRate();
long double inputSample;
long double drySample;
long double clamp;
Float64 inputgain = GetParameter( kParam_One );
if (settingchase != inputgain) {
chasespeed *= 2.0;
settingchase = inputgain;
}
if (chasespeed > 2500.0) chasespeed = 2500.0;
if (gainchase < 0.0) gainchase = inputgain;
thresholdA = 0.618033988749894 / overallscale;
thresholdB = 0.679837387624884 / overallscale;
thresholdC = 0.747821126387373 / overallscale;
thresholdD = 0.82260323902611 / overallscale;
thresholdE = 0.904863562928721 / overallscale;
thresholdF = 0.995349919221593 / overallscale;
thresholdG = 1.094884911143752 / overallscale;
thresholdH = 1.204373402258128 / overallscale;
thresholdI = 1.32481074248394 / overallscale;
thresholdJ = 1.457291816732335 / overallscale;
thresholdK = 1.603020998405568 / overallscale;
thresholdL = 1.763323098246125 / overallscale;
thresholdM = 1.939655408070737 / overallscale;
while (nSampleFrames-- > 0) {
inputSample = *sourceP;
static int noisesource = 0;
noisesource = noisesource % 1700021; noisesource++;
int residue = noisesource * noisesource;
residue = residue % 170003; residue *= residue;
residue = residue % 17011; residue *= residue;
residue = residue % 1709; residue *= residue;
residue = residue % 173; residue *= residue;
residue = residue % 17;
double applyresidue = residue;
applyresidue *= 0.00000001;
applyresidue *= 0.00000001;
inputSample += applyresidue;
//for Atmopshere, we always apply the dither noise. Then, if our result is
//effectively digital black, we'll subtract it again. We want a 'air' hiss
if (inputSample<1.2e-38 && -inputSample<1.2e-38) {
inputSample -= applyresidue;
}
chasespeed *= 0.9999;
chasespeed -= 0.01;
if (chasespeed < 350.0) chasespeed = 350.0;
//we have our chase speed compensated for recent fader activity
gainchase = (((gainchase*chasespeed)+inputgain)/(chasespeed+1.0));
//gainchase is chasing the target, as a simple multiply gain factor
if (1.0 != gainchase) inputSample *= gainchase;
//done with trim control
drySample = inputSample;
clamp = inputSample - lastSampleA;
if (clamp > thresholdA) inputSample = lastSampleA + thresholdA;
if (-clamp > thresholdA) inputSample = lastSampleA - thresholdA;
clamp = inputSample - lastSampleB;
if (clamp > thresholdB) inputSample = lastSampleB + thresholdB;
if (-clamp > thresholdB) inputSample = lastSampleB - thresholdB;
clamp = inputSample - lastSampleC;
if (clamp > thresholdC) inputSample = lastSampleC + thresholdC;
if (-clamp > thresholdC) inputSample = lastSampleC - thresholdC;
clamp = inputSample - lastSampleD;
if (clamp > thresholdD) inputSample = lastSampleD + thresholdD;
if (-clamp > thresholdD) inputSample = lastSampleD - thresholdD;
clamp = inputSample - lastSampleE;
if (clamp > thresholdE) inputSample = lastSampleE + thresholdE;
if (-clamp > thresholdE) inputSample = lastSampleE - thresholdE;
clamp = inputSample - lastSampleF;
if (clamp > thresholdF) inputSample = lastSampleF + thresholdF;
if (-clamp > thresholdF) inputSample = lastSampleF - thresholdF;
clamp = inputSample - lastSampleG;
if (clamp > thresholdG) inputSample = lastSampleG + thresholdG;
if (-clamp > thresholdG) inputSample = lastSampleG - thresholdG;
clamp = inputSample - lastSampleH;
if (clamp > thresholdH) inputSample = lastSampleH + thresholdH;
if (-clamp > thresholdH) inputSample = lastSampleH - thresholdH;
clamp = inputSample - lastSampleI;
if (clamp > thresholdI) inputSample = lastSampleI + thresholdI;
if (-clamp > thresholdI) inputSample = lastSampleI - thresholdI;
clamp = inputSample - lastSampleJ;
if (clamp > thresholdJ) inputSample = lastSampleJ + thresholdJ;
if (-clamp > thresholdJ) inputSample = lastSampleJ - thresholdJ;
clamp = inputSample - lastSampleK;
if (clamp > thresholdK) inputSample = lastSampleK + thresholdK;
if (-clamp > thresholdK) inputSample = lastSampleK - thresholdK;
clamp = inputSample - lastSampleL;
if (clamp > thresholdL) inputSample = lastSampleL + thresholdL;
if (-clamp > thresholdL) inputSample = lastSampleL - thresholdL;
clamp = inputSample - lastSampleM;
if (clamp > thresholdM) inputSample = lastSampleM + thresholdM;
if (-clamp > thresholdM) inputSample = lastSampleM - thresholdM;
if (inputSample > 1.0) inputSample = 1.0;
if (inputSample < -1.0) inputSample = -1.0;
//without this, you can get a NaN condition where it spits out DC offset at full blast!
inputSample = asin(inputSample);
//amplitude aspect
lastSampleM = lastSampleL;
lastSampleL = lastSampleK;
lastSampleK = lastSampleJ;
lastSampleJ = lastSampleI;
lastSampleI = lastSampleH;
lastSampleH = lastSampleG;
lastSampleG = lastSampleF;
lastSampleF = lastSampleE;
lastSampleE = lastSampleD;
lastSampleD = lastSampleC;
lastSampleC = lastSampleB;
lastSampleB = lastSampleA;
lastSampleA = drySample;
//store the raw input sample again for use next time
//32 bit dither, made small and tidy.
int expon; frexpf((Float32)inputSample, &expon);
long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
inputSample += (dither-fpNShape); fpNShape = dither;
//end 32 bit dither
*destP = inputSample;
sourceP += inNumChannels; destP += inNumChannels;
}
}
