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airwindows/plugins/MacSignedAU/FatEQ/FatEQ.cpp
Christopher Johnson 1b0b4d5662 Cabs2
2025-10-18 14:32:15 -04:00

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/*
* File: FatEQ.cpp
*
* Version: 1.0
*
* Created: 10/7/25
*
* Copyright: Copyright © 2025 Airwindows, Airwindows uses the MIT license
*
* Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc. ("Apple") in
* consideration of your agreement to the following terms, and your use, installation, modification
* or redistribution of this Apple software constitutes acceptance of these terms. If you do
* not agree with these terms, please do not use, install, modify or redistribute this Apple
* software.
*
* In consideration of your agreement to abide by the following terms, and subject to these terms,
* Apple grants you a personal, non-exclusive license, under Apple's copyrights in this
* original Apple software (the "Apple Software"), to use, reproduce, modify and redistribute the
* Apple Software, with or without modifications, in source and/or binary forms; provided that if you
* redistribute the Apple Software in its entirety and without modifications, you must retain this
* notice and the following text and disclaimers in all such redistributions of the Apple Software.
* Neither the name, trademarks, service marks or logos of Apple Computer, Inc. may be used to
* endorse or promote products derived from the Apple Software without specific prior written
* permission from Apple. Except as expressly stated in this notice, no other rights or
* licenses, express or implied, are granted by Apple herein, including but not limited to any
* patent rights that may be infringed by your derivative works or by other works in which the
* Apple Software may be incorporated.
*
* The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO WARRANTIES, EXPRESS OR
* IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE
* OR IN COMBINATION WITH YOUR PRODUCTS.
*
* IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE,
* REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER
* UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN
* IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*=============================================================================
FatEQ.cpp
=============================================================================*/
#include "FatEQ.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
AUDIOCOMPONENT_ENTRY(AUBaseFactory, FatEQ)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// FatEQ::FatEQ
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
FatEQ::FatEQ(AudioUnit component)
: AUEffectBase(component)
{
CreateElements();
Globals()->UseIndexedParameters(kNumberOfParameters);
SetParameter(kParam_A, kDefaultValue_ParamA );
SetParameter(kParam_B, kDefaultValue_ParamB );
SetParameter(kParam_C, kDefaultValue_ParamC );
SetParameter(kParam_D, kDefaultValue_ParamD );
SetParameter(kParam_E, kDefaultValue_ParamE );
#if AU_DEBUG_DISPATCHER
mDebugDispatcher = new AUDebugDispatcher (this);
#endif
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// FatEQ::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult FatEQ::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// FatEQ::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult FatEQ::GetParameterInfo(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
AudioUnitParameterInfo &outParameterInfo )
{
ComponentResult result = noErr;
outParameterInfo.flags = kAudioUnitParameterFlag_IsWritable
| kAudioUnitParameterFlag_IsReadable;
if (inScope == kAudioUnitScope_Global) {
switch(inParameterID)
{
case kParam_A:
AUBase::FillInParameterName (outParameterInfo, kParameterAName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamA;
break;
case kParam_B:
AUBase::FillInParameterName (outParameterInfo, kParameterBName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamB;
break;
case kParam_C:
AUBase::FillInParameterName (outParameterInfo, kParameterCName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamC;
break;
case kParam_D:
AUBase::FillInParameterName (outParameterInfo, kParameterDName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamD;
break;
case kParam_E:
AUBase::FillInParameterName (outParameterInfo, kParameterEName, false);
outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
outParameterInfo.minValue = 0.0;
outParameterInfo.maxValue = 1.0;
outParameterInfo.defaultValue = kDefaultValue_ParamE;
break;
default:
result = kAudioUnitErr_InvalidParameter;
break;
}
} else {
result = kAudioUnitErr_InvalidParameter;
}
return result;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// FatEQ::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult FatEQ::GetPropertyInfo (AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
UInt32 & outDataSize,
Boolean & outWritable)
{
return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// FatEQ::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult FatEQ::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
// FatEQ::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult FatEQ::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____FatEQEffectKernel
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// FatEQ::FatEQKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void FatEQ::FatEQKernel::Reset()
{
for (int x = 0; x < pear_total; x++) {
pearA[x] = 0.0;
pearB[x] = 0.0;
pearC[x] = 0.0;
}
lastSample = 0.0;
wasPosClip = false;
wasNegClip = false;
for (int x = 0; x < 16; x++) intermediate[x] = 0.0;
fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// FatEQ::FatEQKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void FatEQ::FatEQKernel::Process( const Float32 *inSourceP,
Float32 *inDestP,
UInt32 inFramesToProcess,
UInt32 inNumChannels,
bool &ioSilence )
{
UInt32 nSampleFrames = inFramesToProcess;
const Float32 *sourceP = inSourceP;
Float32 *destP = inDestP;
double overallscale = 1.0;
overallscale /= 44100.0;
overallscale *= GetSampleRate();
int spacing = floor(overallscale); //should give us working basic scaling, usually 2 or 4
if (spacing < 1) spacing = 1; if (spacing > 16) spacing = 16;
double topLevl = GetParameter( kParam_A )*2.0; if (topLevl < 1.0) topLevl = sqrt(topLevl);
pearA[levl] = GetParameter( kParam_B )*2.0; if (pearA[levl] < 1.0) pearA[levl] = sqrt(pearA[levl]);
pearB[levl] = GetParameter( kParam_C )*2.0; if (pearB[levl] < 1.0) pearB[levl] = sqrt(pearB[levl]);
pearC[levl] = GetParameter( kParam_D )*2.0; if (pearC[levl] < 1.0) pearC[levl] = sqrt(pearC[levl]);
double out = GetParameter( kParam_E );
double freqFactor = sqrt(overallscale) + (overallscale*0.5);
pearA[freq] = pow(0.564,freqFactor+0.85);
pearB[freq] = pow(0.564,freqFactor+4.1);
pearC[freq] = pow(0.564,freqFactor+7.1);
while (nSampleFrames-- > 0) {
double inputSampleL = *sourceP;
if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpd * 1.18e-17;
for (int x = 0; x < pear_max; x += 2) {
//begin Pear filter stages
pearA[figL] = inputSampleL;
pearA[slew] = ((pearA[figL]-pearA[x])+pearA[x+1])*pearA[freq]*0.5;
pearA[x] = pearA[figL] = (pearA[freq]*pearA[figL])+((1.0-pearA[freq])*(pearA[x]+pearA[x+1]));
pearA[x+1] = pearA[slew];
inputSampleL -= pearA[figL];
pearB[figL] = pearA[figL];
pearB[slew] = ((pearB[figL]-pearB[x])+pearB[x+1])*pearB[freq]*0.5;
pearB[x] = pearB[figL] = (pearB[freq]*pearA[figL])+((1.0-pearB[freq])*(pearB[x]+pearB[x+1]));
pearB[x+1] = pearB[slew];
pearA[figL] -= pearB[figL];
pearC[figL] = pearB[figL];
pearC[slew] = ((pearC[figL]-pearC[x])+pearC[x+1])*pearC[freq]*0.5;
pearC[x] = pearC[figL] = (pearC[freq]*pearB[figL])+((1.0-pearC[freq])*(pearC[x]+pearC[x+1]));
pearC[x+1] = pearC[slew];
pearB[figL] -= pearC[figL];
double altered = inputSampleL;
if (topLevl > 1.0) {
altered = fmax(fmin(inputSampleL*M_PI_2,M_PI_2),-M_PI_2);
double X = altered*altered;
double temp = altered*X; altered -= (temp/6.0); temp *= X;
altered += (temp / 120.0); temp *= X; altered -= (temp / 5040.0); temp *= X;
altered += (temp / 362880.0); temp *= X; altered -= (temp / 39916800.0);
}
if (topLevl < 1.0) {
altered = fmax(fmin(inputSampleL,1.0),-1.0);
double polarity = altered;
double X = inputSampleL * altered;
double temp = X; altered = (temp / 2.0); temp *= X;
altered -= (temp / 24.0); temp *= X; altered += (temp / 720.0); temp *= X;
altered -= (temp / 40320.0); temp *= X; altered += (temp / 3628800.0);
altered *= ((polarity<0.0)?-1.0:1.0);
}
inputSampleL = (inputSampleL*(1.0-fabs(topLevl-1.0)))+(altered*fabs(topLevl-1.0));
altered = pearA[figL];
if (pearA[levl] > 1.0) {
altered = fmax(fmin(pearA[figL]*M_PI_2,M_PI_2),-M_PI_2);
double X = altered*altered;
double temp = altered*X; altered -= (temp/6.0); temp *= X;
altered += (temp / 120.0); temp *= X; altered -= (temp / 5040.0); temp *= X;
altered += (temp / 362880.0); temp *= X; altered -= (temp / 39916800.0);
}
if (pearA[levl] < 1.0) {
altered = fmax(fmin(pearA[figL],1.0),-1.0);
double polarity = altered;
double X = pearA[figL] * altered;
double temp = X; altered = (temp / 2.0); temp *= X;
altered -= (temp / 24.0); temp *= X; altered += (temp / 720.0); temp *= X;
altered -= (temp / 40320.0); temp *= X; altered += (temp / 3628800.0);
altered *= ((polarity<0.0)?-1.0:1.0);
}
inputSampleL += (pearA[figL]*(1.0-fabs(pearA[levl]-1.0)))+(altered*fabs(pearA[levl]-1.0));
altered = pearB[figL];
if (pearB[levl] > 1.0) {
altered = fmax(fmin(pearB[figL]*M_PI_2,M_PI_2),-M_PI_2);
double X = altered*altered;
double temp = altered*X; altered -= (temp/6.0); temp *= X;
altered += (temp / 120.0); temp *= X; altered -= (temp / 5040.0); temp *= X;
altered += (temp / 362880.0); temp *= X; altered -= (temp / 39916800.0);
}
if (pearB[levl] < 1.0) {
altered = fmax(fmin(pearB[figL],1.0),-1.0);
double polarity = altered;
double X = pearB[figL] * altered;
double temp = X; altered = (temp / 2.0); temp *= X;
altered -= (temp / 24.0); temp *= X; altered += (temp / 720.0); temp *= X;
altered -= (temp / 40320.0); temp *= X; altered += (temp / 3628800.0);
altered *= ((polarity<0.0)?-1.0:1.0);
}
inputSampleL += (pearB[figL]*(1.0-fabs(pearB[levl]-1.0)))+(altered*fabs(pearB[levl]-1.0));
altered = pearC[figL];
if (pearC[levl] > 1.0) {
altered = fmax(fmin(pearC[figL]*M_PI_2,M_PI_2),-M_PI_2);
double X = altered*altered;
double temp = altered*X; altered -= (temp/6.0); temp *= X;
altered += (temp / 120.0); temp *= X; altered -= (temp / 5040.0); temp *= X;
altered += (temp / 362880.0); temp *= X; altered -= (temp / 39916800.0);
}
if (pearC[levl] < 1.0) {
altered = fmax(fmin(pearC[figL],1.0),-1.0);
double polarity = altered;
double X = pearC[figL] * altered;
double temp = X; altered = (temp / 2.0); temp *= X;
altered -= (temp / 24.0); temp *= X; altered += (temp / 720.0); temp *= X;
altered -= (temp / 40320.0); temp *= X; altered += (temp / 3628800.0);
altered *= ((polarity<0.0)?-1.0:1.0);
}
inputSampleL += (pearC[figL]*(1.0-fabs(pearC[levl]-1.0)))+(altered*fabs(pearC[levl]-1.0));
}
inputSampleL *= out;
//begin ClipOnly2 as a little, compressed chunk that can be dropped into code
if (inputSampleL > 4.0) inputSampleL = 4.0; if (inputSampleL < -4.0) inputSampleL = -4.0;
if (wasPosClip == true) { //current will be over
if (inputSampleL<lastSample) lastSample=0.7058208+(inputSampleL*0.2609148);
else lastSample = 0.2491717+(lastSample*0.7390851);
} wasPosClip = false;
if (inputSampleL>0.9549925859) {wasPosClip=true;inputSampleL=0.7058208+(lastSample*0.2609148);}
if (wasNegClip == true) { //current will be -over
if (inputSampleL > lastSample) lastSample=-0.7058208+(inputSampleL*0.2609148);
else lastSample=-0.2491717+(lastSample*0.7390851);
} wasNegClip = false;
if (inputSampleL<-0.9549925859) {wasNegClip=true;inputSampleL=-0.7058208+(lastSample*0.2609148);}
intermediate[spacing] = inputSampleL;
inputSampleL = lastSample; //Latency is however many samples equals one 44.1k sample
for (int x = spacing; x > 0; x--) intermediate[x-1] = intermediate[x];
lastSample = intermediate[0]; //run a little buffer to handle this
//end ClipOnly2 as a little, compressed chunk that can be dropped into code
//begin 32 bit floating point dither
int expon; frexpf((float)inputSampleL, &expon);
fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
inputSampleL += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
//end 32 bit floating point dither
*destP = inputSampleL;
sourceP += inNumChannels; destP += inNumChannels;
}
}
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