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296 lines
14 KiB
C++
Executable file
296 lines
14 KiB
C++
Executable file
/*
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* File: BiquadStack.cpp
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*
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* Version: 1.0
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*
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* Created: 4/15/24
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*
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* Copyright: Copyright © 2024 Airwindows, Airwindows uses the MIT license
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*
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* Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc. ("Apple") in
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* consideration of your agreement to the following terms, and your use, installation, modification
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* or redistribution of this Apple software constitutes acceptance of these terms. If you do
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* not agree with these terms, please do not use, install, modify or redistribute this Apple
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* software.
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*
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* In consideration of your agreement to abide by the following terms, and subject to these terms,
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* Apple grants you a personal, non-exclusive license, under Apple's copyrights in this
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* original Apple software (the "Apple Software"), to use, reproduce, modify and redistribute the
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* Apple Software, with or without modifications, in source and/or binary forms; provided that if you
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* redistribute the Apple Software in its entirety and without modifications, you must retain this
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* notice and the following text and disclaimers in all such redistributions of the Apple Software.
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* Neither the name, trademarks, service marks or logos of Apple Computer, Inc. may be used to
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* endorse or promote products derived from the Apple Software without specific prior written
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* permission from Apple. Except as expressly stated in this notice, no other rights or
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* licenses, express or implied, are granted by Apple herein, including but not limited to any
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* patent rights that may be infringed by your derivative works or by other works in which the
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* Apple Software may be incorporated.
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*
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* The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO WARRANTIES, EXPRESS OR
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* IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE
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* OR IN COMBINATION WITH YOUR PRODUCTS.
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*
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* IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE,
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* REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER
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* UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN
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* IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/*=============================================================================
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BiquadStack.cpp
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=============================================================================*/
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#include "BiquadStack.h"
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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COMPONENT_ENTRY(BiquadStack)
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BiquadStack::BiquadStack
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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BiquadStack::BiquadStack(AudioUnit component)
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: AUEffectBase(component)
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{
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CreateElements();
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Globals()->UseIndexedParameters(kNumberOfParameters);
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SetParameter(kParam_A, kDefaultValue_ParamA );
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SetParameter(kParam_B, kDefaultValue_ParamB );
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SetParameter(kParam_C, kDefaultValue_ParamC );
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#if AU_DEBUG_DISPATCHER
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mDebugDispatcher = new AUDebugDispatcher (this);
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#endif
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BiquadStack::GetParameterValueStrings
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult BiquadStack::GetParameterValueStrings(AudioUnitScope inScope,
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AudioUnitParameterID inParameterID,
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CFArrayRef * outStrings)
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{
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return kAudioUnitErr_InvalidProperty;
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BiquadStack::GetParameterInfo
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult BiquadStack::GetParameterInfo(AudioUnitScope inScope,
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AudioUnitParameterID inParameterID,
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AudioUnitParameterInfo &outParameterInfo )
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{
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ComponentResult result = noErr;
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outParameterInfo.flags = kAudioUnitParameterFlag_IsWritable
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| kAudioUnitParameterFlag_IsReadable;
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if (inScope == kAudioUnitScope_Global) {
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switch(inParameterID)
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{
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case kParam_A:
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AUBase::FillInParameterName (outParameterInfo, kParameterAName, false);
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outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
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outParameterInfo.minValue = 0.0;
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outParameterInfo.maxValue = 1.0;
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outParameterInfo.defaultValue = kDefaultValue_ParamA;
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break;
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case kParam_B:
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AUBase::FillInParameterName (outParameterInfo, kParameterBName, false);
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outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
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outParameterInfo.minValue = 0.0;
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outParameterInfo.maxValue = 1.0;
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outParameterInfo.defaultValue = kDefaultValue_ParamB;
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break;
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case kParam_C:
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AUBase::FillInParameterName (outParameterInfo, kParameterCName, false);
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outParameterInfo.unit = kAudioUnitParameterUnit_Generic;
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outParameterInfo.minValue = 0.0;
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outParameterInfo.maxValue = 1.0;
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outParameterInfo.defaultValue = kDefaultValue_ParamC;
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break;
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default:
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result = kAudioUnitErr_InvalidParameter;
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break;
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}
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} else {
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result = kAudioUnitErr_InvalidParameter;
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}
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return result;
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BiquadStack::GetPropertyInfo
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult BiquadStack::GetPropertyInfo (AudioUnitPropertyID inID,
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AudioUnitScope inScope,
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AudioUnitElement inElement,
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UInt32 & outDataSize,
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Boolean & outWritable)
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{
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return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BiquadStack::GetProperty
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult BiquadStack::GetProperty( AudioUnitPropertyID inID,
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AudioUnitScope inScope,
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AudioUnitElement inElement,
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void * outData )
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{
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return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
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}
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// BiquadStack::Initialize
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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ComponentResult BiquadStack::Initialize()
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{
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ComponentResult result = AUEffectBase::Initialize();
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if (result == noErr)
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Reset(kAudioUnitScope_Global, 0);
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return result;
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}
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#pragma mark ____BiquadStackEffectKernel
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BiquadStack::BiquadStackKernel::Reset()
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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void BiquadStack::BiquadStackKernel::Reset()
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{
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for (int x = 0; x < biqs_total; x++) {biqs[x] = 0.0;}
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fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX;
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}
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// BiquadStack::BiquadStackKernel::Process
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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void BiquadStack::BiquadStackKernel::Process( const Float32 *inSourceP,
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Float32 *inDestP,
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UInt32 inFramesToProcess,
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UInt32 inNumChannels,
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bool &ioSilence )
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{
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UInt32 nSampleFrames = inFramesToProcess;
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const Float32 *sourceP = inSourceP;
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Float32 *destP = inDestP;
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double overallscale = 1.0;
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overallscale /= 44100.0;
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overallscale *= GetSampleRate();
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biqs[biqs_levelA] = biqs[biqs_levelB];
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biqs[biqs_aA0] = biqs[biqs_aB0];
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biqs[biqs_bA1] = biqs[biqs_bB1];
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biqs[biqs_bA2] = biqs[biqs_bB2];
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biqs[biqs_cA0] = biqs[biqs_cB0];
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biqs[biqs_dA1] = biqs[biqs_dB1];
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biqs[biqs_dA2] = biqs[biqs_dB2];
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biqs[biqs_eA0] = biqs[biqs_eB0];
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biqs[biqs_fA1] = biqs[biqs_fB1];
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biqs[biqs_fA2] = biqs[biqs_fB2];
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//previous run through the buffer is still in the filter, so we move it
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//to the A section and now it's the new starting point.
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biqs[biqs_freq] = (((pow(GetParameter( kParam_A ),4)*19980.0)+20.0)/GetSampleRate());
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biqs[biqs_nonlin] = GetParameter( kParam_B );
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biqs[biqs_levelB] = (biqs[biqs_nonlin]*2.0)-1.0;
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if (biqs[biqs_levelB] > 0.0) biqs[biqs_levelB] *= 2.0;
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biqs[biqs_reso] = ((0.5+(biqs[biqs_nonlin]*0.5)+sqrt(biqs[biqs_freq]))-(1.0-pow(1.0-GetParameter( kParam_C ),2.0)))+0.5+(biqs[biqs_nonlin]*0.5);
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double K = tan(M_PI * biqs[biqs_freq]);
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double norm = 1.0 / (1.0 + K / (biqs[biqs_reso]*1.93185165) + K * K);
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biqs[biqs_aB0] = K / (biqs[biqs_reso]*1.93185165) * norm;
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biqs[biqs_bB1] = 2.0 * (K * K - 1.0) * norm;
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biqs[biqs_bB2] = (1.0 - K / (biqs[biqs_reso]*1.93185165) + K * K) * norm;
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norm = 1.0 / (1.0 + K / (biqs[biqs_reso]*0.70710678) + K * K);
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biqs[biqs_cB0] = K / (biqs[biqs_reso]*0.70710678) * norm;
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biqs[biqs_dB1] = 2.0 * (K * K - 1.0) * norm;
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biqs[biqs_dB2] = (1.0 - K / (biqs[biqs_reso]*0.70710678) + K * K) * norm;
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norm = 1.0 / (1.0 + K / (biqs[biqs_reso]*0.51763809) + K * K);
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biqs[biqs_eB0] = K / (biqs[biqs_reso]*0.51763809) * norm;
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biqs[biqs_fB1] = 2.0 * (K * K - 1.0) * norm;
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biqs[biqs_fB2] = (1.0 - K / (biqs[biqs_reso]*0.51763809) + K * K) * norm;
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if (biqs[biqs_aA0] == 0.0) { // if we have just started, start directly with raw info
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biqs[biqs_levelA] = biqs[biqs_levelB];
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biqs[biqs_aA0] = biqs[biqs_aB0];
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biqs[biqs_bA1] = biqs[biqs_bB1];
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biqs[biqs_bA2] = biqs[biqs_bB2];
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biqs[biqs_cA0] = biqs[biqs_cB0];
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biqs[biqs_dA1] = biqs[biqs_dB1];
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biqs[biqs_dA2] = biqs[biqs_dB2];
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biqs[biqs_eA0] = biqs[biqs_eB0];
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biqs[biqs_fA1] = biqs[biqs_fB1];
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biqs[biqs_fA2] = biqs[biqs_fB2];
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}
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while (nSampleFrames-- > 0) {
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double inputSample = *sourceP;
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if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17;
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double buf = (double)nSampleFrames/inFramesToProcess;
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biqs[biqs_level] = (biqs[biqs_levelA]*buf)+(biqs[biqs_levelB]*(1.0-buf));
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biqs[biqs_a0] = (biqs[biqs_aA0]*buf)+(biqs[biqs_aB0]*(1.0-buf));
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biqs[biqs_b1] = (biqs[biqs_bA1]*buf)+(biqs[biqs_bB1]*(1.0-buf));
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biqs[biqs_b2] = (biqs[biqs_bA2]*buf)+(biqs[biqs_bB2]*(1.0-buf));
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biqs[biqs_c0] = (biqs[biqs_cA0]*buf)+(biqs[biqs_cB0]*(1.0-buf));
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biqs[biqs_d1] = (biqs[biqs_dA1]*buf)+(biqs[biqs_dB1]*(1.0-buf));
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biqs[biqs_d2] = (biqs[biqs_dA2]*buf)+(biqs[biqs_dB2]*(1.0-buf));
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biqs[biqs_e0] = (biqs[biqs_eA0]*buf)+(biqs[biqs_eB0]*(1.0-buf));
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biqs[biqs_f1] = (biqs[biqs_fA1]*buf)+(biqs[biqs_fB1]*(1.0-buf));
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biqs[biqs_f2] = (biqs[biqs_fA2]*buf)+(biqs[biqs_fB2]*(1.0-buf));
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//begin Stacked Biquad With Reversed Neutron Flow L
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biqs[biqs_outL] = inputSample * fabs(biqs[biqs_level]);
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biqs[biqs_dis] = fabs(biqs[biqs_a0] * (1.0+(biqs[biqs_outL]*biqs[biqs_nonlin])));
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if (biqs[biqs_dis] > 1.0) biqs[biqs_dis] = 1.0;
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biqs[biqs_temp] = (biqs[biqs_outL] * biqs[biqs_dis]) + biqs[biqs_aL1];
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biqs[biqs_aL1] = biqs[biqs_aL2] - (biqs[biqs_temp]*biqs[biqs_b1]);
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biqs[biqs_aL2] = (biqs[biqs_outL] * -biqs[biqs_dis]) - (biqs[biqs_temp]*biqs[biqs_b2]);
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biqs[biqs_outL] = biqs[biqs_temp];
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biqs[biqs_dis] = fabs(biqs[biqs_c0] * (1.0+(biqs[biqs_outL]*biqs[biqs_nonlin])));
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if (biqs[biqs_dis] > 1.0) biqs[biqs_dis] = 1.0;
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biqs[biqs_temp] = (biqs[biqs_outL] * biqs[biqs_dis]) + biqs[biqs_cL1];
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biqs[biqs_cL1] = biqs[biqs_cL2] - (biqs[biqs_temp]*biqs[biqs_d1]);
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biqs[biqs_cL2] = (biqs[biqs_outL] * -biqs[biqs_dis]) - (biqs[biqs_temp]*biqs[biqs_d2]);
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biqs[biqs_outL] = biqs[biqs_temp];
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biqs[biqs_dis] = fabs(biqs[biqs_e0] * (1.0+(biqs[biqs_outL]*biqs[biqs_nonlin])));
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if (biqs[biqs_dis] > 1.0) biqs[biqs_dis] = 1.0;
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biqs[biqs_temp] = (biqs[biqs_outL] * biqs[biqs_dis]) + biqs[biqs_eL1];
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biqs[biqs_eL1] = biqs[biqs_eL2] - (biqs[biqs_temp]*biqs[biqs_f1]);
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biqs[biqs_eL2] = (biqs[biqs_outL] * -biqs[biqs_dis]) - (biqs[biqs_temp]*biqs[biqs_f2]);
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biqs[biqs_outL] = biqs[biqs_temp];
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biqs[biqs_outL] *= biqs[biqs_level];
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if (biqs[biqs_level] > 1.0) biqs[biqs_outL] *= biqs[biqs_level];
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//end Stacked Biquad With Reversed Neutron Flow L
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inputSample += biqs[biqs_outL]; //purely a parallel filter stage here
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//begin 32 bit floating point dither
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int expon; frexpf((float)inputSample, &expon);
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fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
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inputSample += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
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//end 32 bit floating point dither
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*destP = inputSample;
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sourceP += inNumChannels; destP += inNumChannels;
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}
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}
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