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+/*
+* File: Baxandall.cpp
+*
+* Version: 1.0
+*
+* Created: 12/22/19
+*
+* Copyright: Copyright © 2019 Airwindows, All Rights Reserved
+*
+* 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.
+*
+*/
+/*=============================================================================
+ Baxandall.cpp
+
+=============================================================================*/
+#include "Baxandall.h"
+
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+COMPONENT_ENTRY(Baxandall)
+
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Baxandall::Baxandall
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Baxandall::Baxandall(AudioUnit component)
+ : AUEffectBase(component)
+{
+ CreateElements();
+ Globals()->UseIndexedParameters(kNumberOfParameters);
+ SetParameter(kParam_One, kDefaultValue_ParamOne );
+ SetParameter(kParam_Two, kDefaultValue_ParamTwo );
+ SetParameter(kParam_Three, kDefaultValue_ParamThree );
+
+#if AU_DEBUG_DISPATCHER
+ mDebugDispatcher = new AUDebugDispatcher (this);
+#endif
+
+}
+
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Baxandall::GetParameterValueStrings
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ComponentResult Baxandall::GetParameterValueStrings(AudioUnitScope inScope,
+ AudioUnitParameterID inParameterID,
+ CFArrayRef * outStrings)
+{
+
+ return kAudioUnitErr_InvalidProperty;
+}
+
+
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Baxandall::GetParameterInfo
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ComponentResult Baxandall::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_Decibels;
+ outParameterInfo.minValue = -15.0;
+ outParameterInfo.maxValue = 15.0;
+ outParameterInfo.defaultValue = kDefaultValue_ParamOne;
+ break;
+ case kParam_Two:
+ AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false);
+ outParameterInfo.unit = kAudioUnitParameterUnit_Decibels;
+ outParameterInfo.minValue = -15.0;
+ outParameterInfo.maxValue = 15.0;
+ outParameterInfo.defaultValue = kDefaultValue_ParamTwo;
+ break;
+ case kParam_Three:
+ AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false);
+ outParameterInfo.unit = kAudioUnitParameterUnit_Decibels;
+ outParameterInfo.minValue = -15.0;
+ outParameterInfo.maxValue = 15.0;
+ outParameterInfo.defaultValue = kDefaultValue_ParamThree;
+ break;
+ default:
+ result = kAudioUnitErr_InvalidParameter;
+ break;
+ }
+ } else {
+ result = kAudioUnitErr_InvalidParameter;
+ }
+
+
+
+ return result;
+}
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Baxandall::GetPropertyInfo
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ComponentResult Baxandall::GetPropertyInfo (AudioUnitPropertyID inID,
+ AudioUnitScope inScope,
+ AudioUnitElement inElement,
+ UInt32 & outDataSize,
+ Boolean & outWritable)
+{
+ return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
+}
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Baxandall::GetProperty
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ComponentResult Baxandall::GetProperty( AudioUnitPropertyID inID,
+ AudioUnitScope inScope,
+ AudioUnitElement inElement,
+ void * outData )
+{
+ return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
+}
+
+// Baxandall::Initialize
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ComponentResult Baxandall::Initialize()
+{
+ ComponentResult result = AUEffectBase::Initialize();
+ if (result == noErr)
+ Reset(kAudioUnitScope_Global, 0);
+ return result;
+}
+
+#pragma mark ____BaxandallEffectKernel
+
+
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Baxandall::BaxandallKernel::Reset()
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+void Baxandall::BaxandallKernel::Reset()
+{
+ for (int x = 0; x < 9; x++) {
+ trebleA[x] = 0.0;
+ trebleB[x] = 0.0;
+ bassA[x] = 0.0;
+ bassB[x] = 0.0;
+ }
+ flip = false;
+ fpd = 17;
+}
+
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Baxandall::BaxandallKernel::Process
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+void Baxandall::BaxandallKernel::Process( const Float32 *inSourceP,
+ Float32 *inDestP,
+ UInt32 inFramesToProcess,
+ UInt32 inNumChannels,
+ bool &ioSilence )
+{
+ UInt32 nSampleFrames = inFramesToProcess;
+ const Float32 *sourceP = inSourceP;
+ Float32 *destP = inDestP;
+
+ Float64 trebleGain = pow(10.0,GetParameter( kParam_One )/20.0);
+ Float64 trebleFreq = (4410.0*trebleGain)/GetSampleRate();
+ if (trebleFreq > 0.45) trebleFreq = 0.45;
+ trebleA[0] = trebleB[0] = trebleFreq;
+ Float64 bassGain = pow(10.0,GetParameter( kParam_Two )/20.0);
+ Float64 bassFreq = pow(10.0,-GetParameter( kParam_Two )/20.0);
+ bassFreq = (4410.0*bassFreq)/GetSampleRate();
+ if (bassFreq > 0.45) bassFreq = 0.45;
+ bassA[0] = bassB[0] = bassFreq;
+ trebleA[1] = trebleB[1] = 0.4;
+ bassA[1] = bassB[1] = 0.2;
+ Float64 output = pow(10.0,GetParameter( kParam_Three )/20.0);
+
+ double K = tan(M_PI * trebleA[0]);
+ double norm = 1.0 / (1.0 + K / trebleA[1] + K * K);
+ trebleB[2] = trebleA[2] = K * K * norm;
+ trebleB[3] = trebleA[3] = 2.0 * trebleA[2];
+ trebleB[4] = trebleA[4] = trebleA[2];
+ trebleB[5] = trebleA[5] = 2.0 * (K * K - 1.0) * norm;
+ trebleB[6] = trebleA[6] = (1.0 - K / trebleA[1] + K * K) * norm;
+
+ K = tan(M_PI * bassA[0]);
+ norm = 1.0 / (1.0 + K / bassA[1] + K * K);
+ bassB[2] = bassA[2] = K * K * norm;
+ bassB[3] = bassA[3] = 2.0 * bassA[2];
+ bassB[4] = bassA[4] = bassA[2];
+ bassB[5] = bassA[5] = 2.0 * (K * K - 1.0) * norm;
+ bassB[6] = bassA[6] = (1.0 - K / bassA[1] + K * K) * norm;
+
+ while (nSampleFrames-- > 0) {
+ long double inputSample = *sourceP;
+ if (fabs(inputSample)<1.18e-37) inputSample = fpd * 1.18e-37;
+
+ if (output != 1.0) {
+ inputSample *= output;
+ }//gain trim in front of plugin, in case Console stage clips
+
+ inputSample = sin(inputSample);
+ //encode Console5: good cleanness
+
+ long double trebleSample;
+ long double bassSample;
+
+ if (flip)
+ {
+ trebleSample = (inputSample * trebleA[2]) + trebleA[7];
+ trebleA[7] = (inputSample * trebleA[3]) - (trebleSample * trebleA[5]) + trebleA[8];
+ trebleA[8] = (inputSample * trebleA[4]) - (trebleSample * trebleA[6]);
+ trebleSample = inputSample - trebleSample;
+
+ bassSample = (inputSample * bassA[2]) + bassA[7];
+ bassA[7] = (inputSample * bassA[3]) - (bassSample * bassA[5]) + bassA[8];
+ bassA[8] = (inputSample * bassA[4]) - (bassSample * bassA[6]);
+ }
+ else
+ {
+ trebleSample = (inputSample * trebleB[2]) + trebleB[7];
+ trebleB[7] = (inputSample * trebleB[3]) - (trebleSample * trebleB[5]) + trebleB[8];
+ trebleB[8] = (inputSample * trebleB[4]) - (trebleSample * trebleB[6]);
+ trebleSample = inputSample - trebleSample;
+
+ bassSample = (inputSample * bassB[2]) + bassB[7];
+ bassB[7] = (inputSample * bassB[3]) - (bassSample * bassB[5]) + bassB[8];
+ bassB[8] = (inputSample * bassB[4]) - (bassSample * bassB[6]);
+ }
+ flip = !flip;
+
+ trebleSample *= trebleGain;
+ bassSample *= bassGain;
+ inputSample = bassSample + trebleSample; //interleaved biquad
+
+
+ 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
+
+ //begin 32 bit floating point dither
+ int expon; frexpf((float)inputSample, &expon);
+ fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
+ inputSample += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
+ //end 32 bit floating point dither
+
+ *destP = inputSample;
+
+ sourceP += inNumChannels; destP += inNumChannels;
+ }
+}
+
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