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airwindows/plugins/MacAU/SmoothEQ/SmoothEQ.cpp
Christopher Johnson 013f2d5e58 SmoothEQ
2025-04-12 14:57:27 -04:00

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/*
* File: SmoothEQ.cpp
*
* Version: 1.0
*
* Created: 3/24/25
*
* 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
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* 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
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* endorse or promote products derived from the Apple Software without specific prior written
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*
* 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
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* IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*=============================================================================
SmoothEQ.cpp
=============================================================================*/
#include "SmoothEQ.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMPONENT_ENTRY(SmoothEQ)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// SmoothEQ::SmoothEQ
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SmoothEQ::SmoothEQ(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
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// SmoothEQ::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult SmoothEQ::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// SmoothEQ::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult SmoothEQ::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;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// SmoothEQ::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult SmoothEQ::GetPropertyInfo (AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
UInt32 & outDataSize,
Boolean & outWritable)
{
return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// SmoothEQ::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult SmoothEQ::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
// SmoothEQ::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult SmoothEQ::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____SmoothEQEffectKernel
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// SmoothEQ::SmoothEQKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void SmoothEQ::SmoothEQKernel::Reset()
{
for (int x = 0; x < biq_total; x++) {
besselA[x] = 0.0;
besselB[x] = 0.0;
besselC[x] = 0.0;
besselD[x] = 0.0;
besselE[x] = 0.0;
besselF[x] = 0.0;
}
fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// SmoothEQ::SmoothEQKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void SmoothEQ::SmoothEQKernel::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();
double trebleGain = GetParameter( kParam_A )*2.0;
double midGain = GetParameter( kParam_B )*2.0;
double bassGain = GetParameter( kParam_C )*2.0; //amount ends up being pow(gain,3)
//simple three band to adjust
besselA[biq_freq] = pow(GetParameter( kParam_D ),2) * (0.25/overallscale) * 1.9047076123;
if (besselA[biq_freq] < 0.00025) besselA[biq_freq] = 0.00025;
if (besselA[biq_freq] > 0.4999) besselA[biq_freq] = 0.4999;
besselA[biq_reso] = 1.02331395383;
besselB[biq_freq] = pow(GetParameter( kParam_D ),2) * (0.25/overallscale) * 1.68916826762;
if (besselB[biq_freq] < 0.00025) besselB[biq_freq] = 0.00025;
if (besselB[biq_freq] > 0.4999) besselB[biq_freq] = 0.4999;
besselB[biq_reso] = 0.611194546878;
besselC[biq_freq] = pow(GetParameter( kParam_D ),2) * (0.25/overallscale) * 1.60391912877;
if (besselC[biq_freq] < 0.00025) besselC[biq_freq] = 0.00025;
if (besselC[biq_freq] > 0.4999) besselC[biq_freq] = 0.4999;
besselC[biq_reso] = 0.510317824749;
besselD[biq_freq] = pow(GetParameter( kParam_E ),4) * (0.25/overallscale) * 1.9047076123;
if (besselD[biq_freq] < 0.00025) besselD[biq_freq] = 0.00025;
if (besselD[biq_freq] > 0.4999) besselD[biq_freq] = 0.4999;
besselD[biq_reso] = 1.02331395383;
besselE[biq_freq] = pow(GetParameter( kParam_E ),4) * (0.25/overallscale) * 1.68916826762;
if (besselE[biq_freq] < 0.00025) besselE[biq_freq] = 0.00025;
if (besselE[biq_freq] > 0.4999) besselE[biq_freq] = 0.4999;
besselE[biq_reso] = 0.611194546878;
besselF[biq_freq] = pow(GetParameter( kParam_E ),4) * (0.25/overallscale) * 1.60391912877;
if (besselF[biq_freq] < 0.00025) besselF[biq_freq] = 0.00025;
if (besselF[biq_freq] > 0.4999) besselF[biq_freq] = 0.4999;
besselF[biq_reso] = 0.510317824749;
double K = tan(M_PI * besselA[biq_freq]);
double norm = 1.0 / (1.0 + K / besselA[biq_reso] + K * K);
besselA[biq_a0] = K * K * norm;
besselA[biq_a1] = 2.0 * besselA[biq_a0];
besselA[biq_a2] = besselA[biq_a0];
besselA[biq_b1] = 2.0 * (K * K - 1.0) * norm;
besselA[biq_b2] = (1.0 - K / besselA[biq_reso] + K * K) * norm;
K = tan(M_PI * besselB[biq_freq]);
norm = 1.0 / (1.0 + K / besselB[biq_reso] + K * K);
besselB[biq_a0] = K * K * norm;
besselB[biq_a1] = 2.0 * besselB[biq_a0];
besselB[biq_a2] = besselB[biq_a0];
besselB[biq_b1] = 2.0 * (K * K - 1.0) * norm;
besselB[biq_b2] = (1.0 - K / besselB[biq_reso] + K * K) * norm;
K = tan(M_PI * besselC[biq_freq]);
norm = 1.0 / (1.0 + K / besselC[biq_reso] + K * K);
besselC[biq_a0] = K * K * norm;
besselC[biq_a1] = 2.0 * besselC[biq_a0];
besselC[biq_a2] = besselC[biq_a0];
besselC[biq_b1] = 2.0 * (K * K - 1.0) * norm;
besselC[biq_b2] = (1.0 - K / besselC[biq_reso] + K * K) * norm;
K = tan(M_PI * besselD[biq_freq]);
norm = 1.0 / (1.0 + K / besselD[biq_reso] + K * K);
besselD[biq_a0] = K * K * norm;
besselD[biq_a1] = 2.0 * besselD[biq_a0];
besselD[biq_a2] = besselD[biq_a0];
besselD[biq_b1] = 2.0 * (K * K - 1.0) * norm;
besselD[biq_b2] = (1.0 - K / besselD[biq_reso] + K * K) * norm;
K = tan(M_PI * besselE[biq_freq]);
norm = 1.0 / (1.0 + K / besselE[biq_reso] + K * K);
besselE[biq_a0] = K * K * norm;
besselE[biq_a1] = 2.0 * besselE[biq_a0];
besselE[biq_a2] = besselE[biq_a0];
besselE[biq_b1] = 2.0 * (K * K - 1.0) * norm;
besselE[biq_b2] = (1.0 - K / besselE[biq_reso] + K * K) * norm;
K = tan(M_PI * besselF[biq_freq]);
norm = 1.0 / (1.0 + K / besselF[biq_reso] + K * K);
besselF[biq_a0] = K * K * norm;
besselF[biq_a1] = 2.0 * besselF[biq_a0];
besselF[biq_a2] = besselF[biq_a0];
besselF[biq_b1] = 2.0 * (K * K - 1.0) * norm;
besselF[biq_b2] = (1.0 - K / besselF[biq_reso] + K * K) * norm;
while (nSampleFrames-- > 0) {
double inputSampleL = *sourceP;
if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpd * 1.18e-17;
double trebleL = inputSampleL;
double outSample = (trebleL * besselA[biq_a0]) + besselA[biq_sL1];
besselA[biq_sL1] = (trebleL * besselA[biq_a1]) - (outSample * besselA[biq_b1]) + besselA[biq_sL2];
besselA[biq_sL2] = (trebleL * besselA[biq_a2]) - (outSample * besselA[biq_b2]);
double midL = outSample; trebleL -= midL;
outSample = (midL * besselD[biq_a0]) + besselD[biq_sL1];
besselD[biq_sL1] = (midL * besselD[biq_a1]) - (outSample * besselD[biq_b1]) + besselD[biq_sL2];
besselD[biq_sL2] = (midL * besselD[biq_a2]) - (outSample * besselD[biq_b2]);
double bassL = outSample; midL -= bassL;
trebleL = (bassL*bassGain) + (midL*midGain) + (trebleL*trebleGain);
outSample = (trebleL * besselB[biq_a0]) + besselB[biq_sL1];
besselB[biq_sL1] = (trebleL * besselB[biq_a1]) - (outSample * besselB[biq_b1]) + besselB[biq_sL2];
besselB[biq_sL2] = (trebleL * besselB[biq_a2]) - (outSample * besselB[biq_b2]);
midL = outSample; trebleL -= midL;
outSample = (midL * besselE[biq_a0]) + besselE[biq_sL1];
besselE[biq_sL1] = (midL * besselE[biq_a1]) - (outSample * besselE[biq_b1]) + besselE[biq_sL2];
besselE[biq_sL2] = (midL * besselE[biq_a2]) - (outSample * besselE[biq_b2]);
bassL = outSample; midL -= bassL;
trebleL = (bassL*bassGain) + (midL*midGain) + (trebleL*trebleGain);
outSample = (trebleL * besselC[biq_a0]) + besselC[biq_sL1];
besselC[biq_sL1] = (trebleL * besselC[biq_a1]) - (outSample * besselC[biq_b1]) + besselC[biq_sL2];
besselC[biq_sL2] = (trebleL * besselC[biq_a2]) - (outSample * besselC[biq_b2]);
midL = outSample; trebleL -= midL;
outSample = (midL * besselF[biq_a0]) + besselF[biq_sL1];
besselF[biq_sL1] = (midL * besselF[biq_a1]) - (outSample * besselF[biq_b1]) + besselF[biq_sL2];
besselF[biq_sL2] = (midL * besselF[biq_a2]) - (outSample * besselF[biq_b2]);
bassL = outSample; midL -= bassL;
inputSampleL = (bassL*bassGain) + (midL*midGain) + (trebleL*trebleGain);
//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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