/* * File: NotJustAnotherDither.cpp * * Version: 1.0 * * Created: 1/31/17 * * Copyright: Copyright © 2017 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. 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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. * */ /*============================================================================= NotJustAnotherDither.cpp =============================================================================*/ #include "NotJustAnotherDither.h" //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ COMPONENT_ENTRY(NotJustAnotherDither) //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // NotJustAnotherDither::NotJustAnotherDither //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ NotJustAnotherDither::NotJustAnotherDither(AudioUnit component) : AUEffectBase(component) { CreateElements(); Globals()->UseIndexedParameters(kNumberOfParameters); SetParameter(kParam_One, kDefaultValue_ParamOne ); SetParameter(kParam_Two, kDefaultValue_ParamTwo ); #if AU_DEBUG_DISPATCHER mDebugDispatcher = new AUDebugDispatcher (this); #endif } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // NotJustAnotherDither::GetParameterValueStrings //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult NotJustAnotherDither::GetParameterValueStrings(AudioUnitScope inScope, AudioUnitParameterID inParameterID, CFArrayRef * outStrings) { if ((inScope == kAudioUnitScope_Global) && (inParameterID == kParam_One)) //ID must be actual name of parameter identifier, not number { if (outStrings == NULL) return noErr; CFStringRef strings [] = { kMenuItem_CD, kMenuItem_HD, }; *outStrings = CFArrayCreate ( NULL, (const void **) strings, (sizeof (strings) / sizeof (strings [0])), NULL ); return noErr; } return kAudioUnitErr_InvalidProperty; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // NotJustAnotherDither::GetParameterInfo //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult NotJustAnotherDither::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_Indexed; outParameterInfo.minValue = kCD; outParameterInfo.maxValue = kHD; outParameterInfo.defaultValue = kDefaultValue_ParamOne; break; case kParam_Two: AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false); outParameterInfo.unit = kAudioUnitParameterUnit_Generic; outParameterInfo.minValue = 0.0; outParameterInfo.maxValue = 1.0; outParameterInfo.defaultValue = kDefaultValue_ParamTwo; break; default: result = kAudioUnitErr_InvalidParameter; break; } } else { result = kAudioUnitErr_InvalidParameter; } return result; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // NotJustAnotherDither::GetPropertyInfo //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult NotJustAnotherDither::GetPropertyInfo (AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, UInt32 & outDataSize, Boolean & outWritable) { return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable); } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // NotJustAnotherDither::GetProperty //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult NotJustAnotherDither::GetProperty( AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, void * outData ) { return AUEffectBase::GetProperty (inID, inScope, inElement, outData); } // NotJustAnotherDither::Initialize //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult NotJustAnotherDither::Initialize() { ComponentResult result = AUEffectBase::Initialize(); if (result == noErr) Reset(kAudioUnitScope_Global, 0); return result; } #pragma mark ____NotJustAnotherDitherEffectKernel //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // NotJustAnotherDither::NotJustAnotherDitherKernel::Reset() //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ void NotJustAnotherDither::NotJustAnotherDitherKernel::Reset() { byn[0] = 1000.0; byn[1] = 301.0; byn[2] = 176.0; byn[3] = 125.0; byn[4] = 97.0; byn[5] = 79.0; byn[6] = 67.0; byn[7] = 58.0; byn[8] = 51.0; byn[9] = 46.0; byn[10] = 1000.0; noiseShaping = 0.0; fpd = 17; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // NotJustAnotherDither::NotJustAnotherDitherKernel::Process //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ void NotJustAnotherDither::NotJustAnotherDitherKernel::Process( const Float32 *inSourceP, Float32 *inDestP, UInt32 inFramesToProcess, UInt32 inNumChannels, bool &ioSilence ) { UInt32 nSampleFrames = inFramesToProcess; const Float32 *sourceP = inSourceP; Float32 *destP = inDestP; bool highres = false; if (GetParameter( kParam_One ) == 1) highres = true; Float32 scaleFactor; if (highres) scaleFactor = 8388608.0; else scaleFactor = 32768.0; Float32 derez = GetParameter( kParam_Two ); if (derez > 0.0) scaleFactor *= pow(1.0-derez,6); if (scaleFactor < 0.0001) scaleFactor = 0.0001; Float32 outScale = scaleFactor; if (outScale < 8.0) outScale = 8.0; while (nSampleFrames-- > 0) { long double inputSample = *sourceP; if (fabs(inputSample)<1.18e-37) inputSample = fpd * 1.18e-37; fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5; inputSample *= scaleFactor; //0-1 is now one bit, now we dither bool cutbins; cutbins = false; long double drySample = inputSample; inputSample -= noiseShaping; long double benfordize; benfordize = floor(inputSample); while (benfordize >= 1.0) benfordize /= 10; while (benfordize < 1.0 && benfordize > 0.0000001) benfordize *= 10; int hotbinA; hotbinA = floor(benfordize); //hotbin becomes the Benford bin value for this number floored long double totalA; totalA = 0; if ((hotbinA > 0) && (hotbinA < 10)) { byn[hotbinA] += 1; if (byn[hotbinA] > 982) cutbins = true; totalA += (301-byn[1]); totalA += (176-byn[2]); totalA += (125-byn[3]); totalA += (97-byn[4]); totalA += (79-byn[5]); totalA += (67-byn[6]); totalA += (58-byn[7]); totalA += (51-byn[8]); totalA += (46-byn[9]); byn[hotbinA] -= 1; } else hotbinA = 10; //produce total number- smaller is closer to Benford real benfordize = ceil(inputSample); while (benfordize >= 1.0) benfordize /= 10; while (benfordize < 1.0 && benfordize > 0.0000001) benfordize *= 10; int hotbinB; hotbinB = floor(benfordize); //hotbin becomes the Benford bin value for this number ceiled long double totalB; totalB = 0; if ((hotbinB > 0) && (hotbinB < 10)) { byn[hotbinB] += 1; if (byn[hotbinB] > 982) cutbins = true; totalB += (301-byn[1]); totalB += (176-byn[2]); totalB += (125-byn[3]); totalB += (97-byn[4]); totalB += (79-byn[5]); totalB += (67-byn[6]); totalB += (58-byn[7]); totalB += (51-byn[8]); totalB += (46-byn[9]); byn[hotbinB] -= 1; } else hotbinB = 10; //produce total number- smaller is closer to Benford real long double outputSample; if (totalA < totalB) {byn[hotbinA] += 1; outputSample = floor(inputSample);} else {byn[hotbinB] += 1; outputSample = floor(inputSample+1);} //assign the relevant one to the delay line //and floor/ceil signal accordingly if (cutbins) { byn[1] *= 0.99; byn[2] *= 0.99; byn[3] *= 0.99; byn[4] *= 0.99; byn[5] *= 0.99; byn[6] *= 0.99; byn[7] *= 0.99; byn[8] *= 0.99; byn[9] *= 0.99; byn[10] *= 0.99; } noiseShaping += outputSample - drySample; if (noiseShaping > fabs(inputSample)) noiseShaping = fabs(inputSample); if (noiseShaping < -fabs(inputSample)) noiseShaping = -fabs(inputSample); inputSample = outputSample / outScale; if (inputSample > 1.0) inputSample = 1.0; if (inputSample < -1.0) inputSample = -1.0; *destP = inputSample; sourceP += inNumChannels; destP += inNumChannels; } }