/* * File: Lowpass2.cpp * * Version: 1.0 * * Created: 3/13/19 * * 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. * */ /*============================================================================= Lowpass2.cpp =============================================================================*/ #include "Lowpass2.h" //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ COMPONENT_ENTRY(Lowpass2) //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Lowpass2::Lowpass2 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Lowpass2::Lowpass2(AudioUnit component) : AUEffectBase(component) { CreateElements(); Globals()->UseIndexedParameters(kNumberOfParameters); SetParameter(kParam_One, kDefaultValue_ParamOne ); SetParameter(kParam_Two, kDefaultValue_ParamTwo ); SetParameter(kParam_Three, kDefaultValue_ParamThree ); SetParameter(kParam_Four, kDefaultValue_ParamFour ); #if AU_DEBUG_DISPATCHER mDebugDispatcher = new AUDebugDispatcher (this); #endif } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Lowpass2::GetParameterValueStrings //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult Lowpass2::GetParameterValueStrings(AudioUnitScope inScope, AudioUnitParameterID inParameterID, CFArrayRef * outStrings) { return kAudioUnitErr_InvalidProperty; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Lowpass2::GetParameterInfo //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult Lowpass2::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; case kParam_Two: AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false); outParameterInfo.unit = kAudioUnitParameterUnit_Generic; outParameterInfo.minValue = -1.0; outParameterInfo.maxValue = 1.0; outParameterInfo.defaultValue = kDefaultValue_ParamTwo; break; case kParam_Three: AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false); outParameterInfo.unit = kAudioUnitParameterUnit_Generic; outParameterInfo.minValue = 0.0; outParameterInfo.maxValue = 4.0; outParameterInfo.defaultValue = kDefaultValue_ParamThree; break; case kParam_Four: AUBase::FillInParameterName (outParameterInfo, kParameterFourName, false); outParameterInfo.unit = kAudioUnitParameterUnit_Generic; outParameterInfo.minValue = 0.0; outParameterInfo.maxValue = 1.0; outParameterInfo.defaultValue = kDefaultValue_ParamFour; break; default: result = kAudioUnitErr_InvalidParameter; break; } } else { result = kAudioUnitErr_InvalidParameter; } return result; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Lowpass2::GetPropertyInfo //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult Lowpass2::GetPropertyInfo (AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, UInt32 & outDataSize, Boolean & outWritable) { return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable); } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Lowpass2::GetProperty //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult Lowpass2::GetProperty( AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, void * outData ) { return AUEffectBase::GetProperty (inID, inScope, inElement, outData); } // Lowpass2::Initialize //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult Lowpass2::Initialize() { ComponentResult result = AUEffectBase::Initialize(); if (result == noErr) Reset(kAudioUnitScope_Global, 0); return result; } #pragma mark ____Lowpass2EffectKernel //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Lowpass2::Lowpass2Kernel::Reset() //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ void Lowpass2::Lowpass2Kernel::Reset() { iirSampleA = 0.0; iirSampleB = 0.0; iirSampleC = 0.0; iirSampleD = 0.0; iirSampleE = 0.0; iirSampleF = 0.0; iirSampleG = 0.0; iirSampleH = 0.0; fpd = 17; fpFlip = true; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Lowpass2::Lowpass2Kernel::Process //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ void Lowpass2::Lowpass2Kernel::Process( const Float32 *inSourceP, Float32 *inDestP, UInt32 inFramesToProcess, UInt32 inNumChannels, bool &ioSilence ) { UInt32 nSampleFrames = inFramesToProcess; const Float32 *sourceP = inSourceP; Float32 *destP = inDestP; Float64 iirAmount = GetParameter( kParam_One ); Float64 tight = GetParameter( kParam_Two ); if (iirAmount < 0.0000001) iirAmount = 0.0000001; if (iirAmount > 1) iirAmount = 1; if (tight < 0.0) tight *= 0.5; Float64 offset; Float64 aWet = 1.0; Float64 bWet = 1.0; Float64 cWet = 1.0; Float64 dWet = GetParameter( kParam_Three ); //four-stage wet/dry control using progressive stages that bypass when not engaged if (dWet < 1.0) {aWet = dWet; bWet = 0.0; cWet = 0.0; dWet = 0.0;} else if (dWet < 2.0) {bWet = dWet - 1.0; cWet = 0.0; dWet = 0.0;} else if (dWet < 3.0) {cWet = dWet - 2.0; dWet = 0.0;} else {dWet -= 3.0;} //this is one way to make a little set of dry/wet stages that are successively added to the //output as the control is turned up. Each one independently goes from 0-1 and stays at 1 //beyond that point: this is a way to progressively add a 'black box' sound processing //which lets you fall through to simpler processing at lower settings. Float64 wet = GetParameter( kParam_Four ); while (nSampleFrames-- > 0) { long double inputSample = *sourceP; static int noisesource = 0; int residue; double applyresidue; noisesource = noisesource % 1700021; noisesource++; 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; applyresidue = residue; applyresidue *= 0.00000001; applyresidue *= 0.00000001; inputSample += applyresidue; if (inputSample<1.2e-38 && -inputSample<1.2e-38) { inputSample -= applyresidue; } //for live air, we always apply the dither noise. Then, if our result is //effectively digital black, we'll subtract it again. We want a 'air' hiss long double drySample = inputSample; if (tight > 0) offset = (1 - tight) + (fabs(inputSample)*tight); else offset = (1 + tight) + ((1-fabs(inputSample))*tight); if (offset < 0.0000001) offset = 0.0000001; if (offset > 1) offset = 1; if (fpFlip) { if (aWet > 0.0) { iirSampleA = (iirSampleA * (1 - (offset * iirAmount))) + (inputSample * (offset * iirAmount)); inputSample = (iirSampleA * aWet) + (inputSample * (1.0-aWet)); } if (bWet > 0.0) { iirSampleC = (iirSampleC * (1 - (offset * iirAmount))) + (inputSample * (offset * iirAmount)); inputSample = (iirSampleC * bWet) + (inputSample * (1.0-bWet)); } if (cWet > 0.0) { iirSampleE = (iirSampleE * (1 - (offset * iirAmount))) + (inputSample * (offset * iirAmount)); inputSample = (iirSampleE * cWet) + (inputSample * (1.0-cWet)); } if (dWet > 0.0) { iirSampleG = (iirSampleG * (1 - (offset * iirAmount))) + (inputSample * (offset * iirAmount)); inputSample = (iirSampleG * dWet) + (inputSample * (1.0-dWet)); } } else { if (aWet > 0.0) { iirSampleB = (iirSampleB * (1 - (offset * iirAmount))) + (inputSample * (offset * iirAmount)); inputSample = (iirSampleB * aWet) + (inputSample * (1.0-aWet)); } if (bWet > 0.0) { iirSampleD = (iirSampleD * (1 - (offset * iirAmount))) + (inputSample * (offset * iirAmount)); inputSample = (iirSampleD * bWet) + (inputSample * (1.0-bWet)); } if (cWet > 0.0) { iirSampleF = (iirSampleF * (1 - (offset * iirAmount))) + (inputSample * (offset * iirAmount)); inputSample = (iirSampleF * cWet) + (inputSample * (1.0-cWet)); } if (dWet > 0.0) { iirSampleH = (iirSampleH * (1 - (offset * iirAmount))) + (inputSample * (offset * iirAmount)); inputSample = (iirSampleH * dWet) + (inputSample * (1.0-dWet)); } } if (wet !=1.0) { inputSample = (inputSample * wet) + (drySample * (1.0-wet)); } //Dry/Wet control, defaults to the last slider fpFlip = !fpFlip; //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; } }