/* * File: FromTape.cpp * * Version: 1.0 * * Created: 7/3/17 * * 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. * */ /*============================================================================= FromTape.cpp =============================================================================*/ #include "FromTape.h" //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ COMPONENT_ENTRY(FromTape) //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // FromTape::FromTape //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ FromTape::FromTape(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 ); SetParameter(kParam_Five, kDefaultValue_ParamFive ); #if AU_DEBUG_DISPATCHER mDebugDispatcher = new AUDebugDispatcher (this); #endif } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // FromTape::GetParameterValueStrings //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult FromTape::GetParameterValueStrings(AudioUnitScope inScope, AudioUnitParameterID inParameterID, CFArrayRef * outStrings) { return kAudioUnitErr_InvalidProperty; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // FromTape::GetParameterInfo //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult FromTape::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 = 2.0; 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; case kParam_Three: AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false); outParameterInfo.unit = kAudioUnitParameterUnit_Generic; outParameterInfo.minValue = 0.0; outParameterInfo.maxValue = 1.0; outParameterInfo.defaultValue = kDefaultValue_ParamThree; break; case kParam_Four: AUBase::FillInParameterName (outParameterInfo, kParameterFourName, false); outParameterInfo.unit = kAudioUnitParameterUnit_Generic; outParameterInfo.minValue = 0.0; outParameterInfo.maxValue = 2.0; outParameterInfo.defaultValue = kDefaultValue_ParamFour; break; case kParam_Five: AUBase::FillInParameterName (outParameterInfo, kParameterFiveName, false); outParameterInfo.unit = kAudioUnitParameterUnit_Generic; outParameterInfo.minValue = 0.0; outParameterInfo.maxValue = 1.0; outParameterInfo.defaultValue = kDefaultValue_ParamFive; break; default: result = kAudioUnitErr_InvalidParameter; break; } } else { result = kAudioUnitErr_InvalidParameter; } return result; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // FromTape::GetPropertyInfo //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult FromTape::GetPropertyInfo (AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, UInt32 & outDataSize, Boolean & outWritable) { return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable); } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // FromTape::GetProperty //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult FromTape::GetProperty( AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, void * outData ) { return AUEffectBase::GetProperty (inID, inScope, inElement, outData); } // FromTape::Initialize //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult FromTape::Initialize() { ComponentResult result = AUEffectBase::Initialize(); if (result == noErr) Reset(kAudioUnitScope_Global, 0); return result; } #pragma mark ____FromTapeEffectKernel //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // FromTape::FromTapeKernel::Reset() //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ void FromTape::FromTapeKernel::Reset() { iirMidRollerA = 0.0; iirMidRollerB = 0.0; iirMidRollerC = 0.0; iirSampleA = 0.0; iirSampleB = 0.0; iirSampleC = 0.0; iirSampleD = 0.0; iirSampleE = 0.0; iirSampleF = 0.0; iirSampleG = 0.0; iirSampleH = 0.0; iirSampleI = 0.0; iirSampleJ = 0.0; iirSampleK = 0.0; iirSampleL = 0.0; iirSampleM = 0.0; iirSampleN = 0.0; iirSampleO = 0.0; iirSampleP = 0.0; iirSampleQ = 0.0; iirSampleR = 0.0; iirSampleS = 0.0; iirSampleT = 0.0; iirSampleU = 0.0; iirSampleV = 0.0; iirSampleW = 0.0; iirSampleX = 0.0; iirSampleY = 0.0; iirSampleZ = 0.0; flip = 0; //noisesource = 0; fpNShape = 0.0; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // FromTape::FromTapeKernel::Process //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ void FromTape::FromTapeKernel::Process( const Float32 *inSourceP, Float32 *inDestP, UInt32 inFramesToProcess, UInt32 inNumChannels, bool &ioSilence ) { UInt32 nSampleFrames = inFramesToProcess; const Float32 *sourceP = inSourceP; Float32 *destP = inDestP; Float64 overallscale = 1.0; overallscale /= 44100.0; overallscale *= GetSampleRate(); Float64 inputgain = GetParameter( kParam_One ); Float64 SoftenControl = GetParameter( kParam_Two ); Float64 RollAmount = (1.0-SoftenControl)/overallscale; Float64 iirAmount = (0.004*(1.0-GetParameter( kParam_Three )))/overallscale; Float64 altAmount = 1.0 - iirAmount; Float64 outputgain = GetParameter( kParam_Four ); Float64 wet = GetParameter( kParam_Five ); Float64 dry = 1.0 - wet; Float64 HighsSample = 0.0; Float64 Subtract; Float64 bridgerectifier; Float64 randy; Float64 invrandy; Float64 tempSample; Float64 drySample; long double inputSample; while (nSampleFrames-- > 0) { inputSample = *sourceP; if (inputSample<1.2e-38 && -inputSample<1.2e-38) { static int noisesource = 0; //this declares a variable before anything else is compiled. It won't keep assigning //it to 0 for every sample, it's as if the declaration doesn't exist in this context, //but it lets me add this denormalization fix in a single place rather than updating //it in three different locations. The variable isn't thread-safe but this is only //a random seed and we can share it with whatever. noisesource = noisesource % 1700021; noisesource++; int 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; double applyresidue = residue; applyresidue *= 0.00000001; applyresidue *= 0.00000001; inputSample = applyresidue; //this denormalization routine produces a white noise at -300 dB which the noise //shaping will interact with to produce a bipolar output, but the noise is actually //all positive. That should stop any variables from going denormal, and the routine //only kicks in if digital black is input. As a final touch, if you save to 24-bit //the silence will return to being digital black again. } drySample = inputSample; if (inputgain != 1.0) { inputSample *= inputgain; } randy = (rand()/(double)RAND_MAX) * SoftenControl; //for soften invrandy = (1.0-randy); randy /= 2.0; //we've set up so that we dial in the amount of the alt sections (in pairs) with invrandy being the source section Subtract = 0.0; tempSample = inputSample; iirSampleA = (iirSampleA * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleA; Subtract += iirSampleA; iirSampleB = (iirSampleB * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleB; Subtract += iirSampleB; iirSampleC = (iirSampleC * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleC; Subtract += iirSampleC; iirSampleD = (iirSampleD * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleD; Subtract += iirSampleD; iirSampleE = (iirSampleE * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleE; Subtract += iirSampleE; iirSampleF = (iirSampleF * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleF; Subtract += iirSampleF; iirSampleG = (iirSampleG * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleG; Subtract += iirSampleG; iirSampleH = (iirSampleH * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleH; Subtract += iirSampleH; iirSampleI = (iirSampleI * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleI; Subtract += iirSampleI; iirSampleJ = (iirSampleJ * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleJ; Subtract += iirSampleJ; iirSampleK = (iirSampleK * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleK; Subtract += iirSampleK; iirSampleL = (iirSampleL * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleL; Subtract += iirSampleL; iirSampleM = (iirSampleM * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleM; Subtract += iirSampleM; iirSampleN = (iirSampleN * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleN; Subtract += iirSampleN; iirSampleO = (iirSampleO * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleO; Subtract += iirSampleO; iirSampleP = (iirSampleP * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleP; Subtract += iirSampleP; iirSampleQ = (iirSampleQ * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleQ; Subtract += iirSampleQ; iirSampleR = (iirSampleR * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleR; Subtract += iirSampleR; iirSampleS = (iirSampleS * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleS; Subtract += iirSampleS; iirSampleT = (iirSampleT * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleT; Subtract += iirSampleT; iirSampleU = (iirSampleU * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleU; Subtract += iirSampleU; iirSampleV = (iirSampleV * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleV; Subtract += iirSampleV; iirSampleW = (iirSampleW * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleW; Subtract += iirSampleW; iirSampleX = (iirSampleX * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleX; Subtract += iirSampleX; iirSampleY = (iirSampleY * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleY; Subtract += iirSampleY; iirSampleZ = (iirSampleZ * altAmount) + (tempSample * iirAmount); tempSample -= iirSampleZ; Subtract += iirSampleZ; //do the IIR on a dummy sample, and store up the correction in a variable at the same scale as the very low level //numbers being used. Don't keep doing it against the possibly high level signal number. //This has been known to add a resonant quality to the cutoff, which we're using on purpose. inputSample -= Subtract; //apply stored up tiny corrections. if (flip < 1 || flip > 3) flip = 1; switch (flip) { case 1: iirMidRollerA = (iirMidRollerA * (1.0 - RollAmount)) + (inputSample * RollAmount); iirMidRollerA = (invrandy * iirMidRollerA) + (randy * iirMidRollerB) + (randy * iirMidRollerC); HighsSample = inputSample - iirMidRollerA; break; case 2: iirMidRollerB = (iirMidRollerB * (1.0 - RollAmount)) + (inputSample * RollAmount); iirMidRollerB = (randy * iirMidRollerA) + (invrandy * iirMidRollerB) + (randy * iirMidRollerC); HighsSample = inputSample - iirMidRollerB; break; case 3: iirMidRollerC = (iirMidRollerC * (1.0 - RollAmount)) + (inputSample * RollAmount); iirMidRollerC = (randy * iirMidRollerA) + (randy * iirMidRollerB) + (invrandy * iirMidRollerC); HighsSample = inputSample - iirMidRollerC; break; } flip++; //increment the triplet counter Subtract = HighsSample; bridgerectifier = fabs(Subtract)*1.57079633; if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633; bridgerectifier = 1-cos(bridgerectifier); if (Subtract > 0) Subtract = bridgerectifier; if (Subtract < 0) Subtract = -bridgerectifier; inputSample -= Subtract; //Soften works using the MidRoller stuff, defining a bright parallel channel that we apply negative Density //to, and then subtract from the main audio. That makes the 'highs channel subtract' hit only the loudest //transients, plus we are subtracting any artifacts we got from the negative Density. if (outputgain != 1.0) { inputSample *= outputgain; } if (wet !=1.0) { inputSample = (inputSample * wet) + (drySample * dry); } //32 bit dither, made small and tidy. int expon; frexpf((Float32)inputSample, &expon); long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62); inputSample += (dither-fpNShape); fpNShape = dither; //end 32 bit dither *destP = inputSample; sourceP += inNumChannels; destP += inNumChannels; } }