/* * File: Channel9.cpp * * Version: 1.0 * * Created: 1/4/21 * * Copyright: Copyright © 2021 Airwindows, Airwindows uses the MIT license * * 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. * */ /*============================================================================= Channel9.cpp =============================================================================*/ #include "Channel9.h" //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AUDIOCOMPONENT_ENTRY(AUBaseFactory, Channel9) //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Channel9::Channel9 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Channel9::Channel9(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 } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Channel9::GetParameterValueStrings //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult Channel9::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_Neve, kMenuItem_API, kMenuItem_SSL, kMenuItem_Teac, kMenuItem_Mackie, }; *outStrings = CFArrayCreate ( NULL, (const void **) strings, (sizeof (strings) / sizeof (strings [0])), NULL ); return noErr; } return kAudioUnitErr_InvalidProperty; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Channel9::GetParameterInfo //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult Channel9::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 = kNeve; outParameterInfo.maxValue = kMackie; outParameterInfo.defaultValue = kDefaultValue_ParamOne; break; case kParam_Two: AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false); outParameterInfo.unit = kAudioUnitParameterUnit_Percent; outParameterInfo.minValue = 0.0; outParameterInfo.maxValue = 200.0; 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; default: result = kAudioUnitErr_InvalidParameter; break; } } else { result = kAudioUnitErr_InvalidParameter; } return result; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Channel9::GetPropertyInfo //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult Channel9::GetPropertyInfo (AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, UInt32 & outDataSize, Boolean & outWritable) { return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable); } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Channel9::GetProperty //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult Channel9::GetProperty( AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, void * outData ) { return AUEffectBase::GetProperty (inID, inScope, inElement, outData); } // Channel9::Initialize //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult Channel9::Initialize() { ComponentResult result = AUEffectBase::Initialize(); if (result == noErr) Reset(kAudioUnitScope_Global, 0); return result; } #pragma mark ____Channel9EffectKernel //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Channel9::Channel9Kernel::Reset() //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ void Channel9::Channel9Kernel::Reset() { fpd = 1.0; while (fpd < 16386) fpd = rand()*UINT32_MAX; iirSampleA = iirSampleB = 0.0; flip = false; lastSampleA = lastSampleB = lastSampleC = 0.0; for (int x = 0; x < 11; x++) {biquadA[x] = 0.0;biquadB[x] = 0.0;} } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // Channel9::Channel9Kernel::Process //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ void Channel9::Channel9Kernel::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(); int console = (int) GetParameter( kParam_One ); Float64 density = GetParameter( kParam_Two )/100.0; //0-2 Float64 phattity = density - 1.0; if (density > 1.0) density = 1.0; //max out at full wet for Spiral aspect if (phattity < 0.0) phattity = 0.0; // Float64 nonLin = 5.0-density; //number is smaller for more intense, larger for more subtle Float64 output = GetParameter( kParam_Three ); Float64 iirAmount = 0.005832; Float64 threshold = 0.33362176; Float64 cutoff = 28811.0; switch (console) { case 1: iirAmount = 0.005832; threshold = 0.33362176; cutoff = 28811.0; break; //Neve case 2: iirAmount = 0.004096; threshold = 0.59969536; cutoff = 27216.0; break; //API case 3: iirAmount = 0.004913; threshold = 0.84934656; cutoff = 23011.0; break; //SSL case 4: iirAmount = 0.009216; threshold = 0.149; cutoff = 18544.0; break; //Teac case 5: iirAmount = 0.011449; threshold = 0.092; cutoff = 19748.0; break; //Mackie } iirAmount /= overallscale; //we've learned not to try and adjust threshold for sample rate biquadB[0] = biquadA[0] = cutoff / GetSampleRate(); biquadA[1] = 1.618033988749894848204586; biquadB[1] = 0.618033988749894848204586; double K = tan(M_PI * biquadA[0]); //lowpass double norm = 1.0 / (1.0 + K / biquadA[1] + K * K); biquadA[2] = K * K * norm; biquadA[3] = 2.0 * biquadA[2]; biquadA[4] = biquadA[2]; biquadA[5] = 2.0 * (K * K - 1.0) * norm; biquadA[6] = (1.0 - K / biquadA[1] + K * K) * norm; K = tan(M_PI * biquadA[0]); norm = 1.0 / (1.0 + K / biquadB[1] + K * K); biquadB[2] = K * K * norm; biquadB[3] = 2.0 * biquadB[2]; biquadB[4] = biquadB[2]; biquadB[5] = 2.0 * (K * K - 1.0) * norm; biquadB[6] = (1.0 - K / biquadB[1] + K * K) * norm; while (nSampleFrames-- > 0) { double inputSample = *sourceP; if (fabs(inputSample)<1.18e-23) inputSample = fpd * 1.18e-17; if (biquadA[0] < 0.49999) { double tempSample = biquadA[2]*inputSample+biquadA[3]*biquadA[7]+biquadA[4]*biquadA[8]-biquadA[5]*biquadA[9]-biquadA[6]*biquadA[10]; biquadA[8] = biquadA[7]; biquadA[7] = inputSample; if (fabs(tempSample)<1.18e-37) tempSample = 0.0; inputSample = tempSample; biquadA[10] = biquadA[9]; biquadA[9] = inputSample; //DF1 } Float64 dielectricScale = fabs(2.0-((inputSample+nonLin)/nonLin)); if (flip) { if (fabs(iirSampleA)<1.18e-37) iirSampleA = 0.0; iirSampleA = (iirSampleA * (1.0 - (iirAmount * dielectricScale))) + (inputSample * iirAmount * dielectricScale); inputSample = inputSample - iirSampleA; } else { if (fabs(iirSampleB)<1.18e-37) iirSampleB = 0.0; iirSampleB = (iirSampleB * (1.0 - (iirAmount * dielectricScale))) + (inputSample * iirAmount * dielectricScale); inputSample = inputSample - iirSampleB; } //highpass section including capacitor modeling nonlinearity double drySample = inputSample; if (inputSample > 1.0) inputSample = 1.0; if (inputSample < -1.0) inputSample = -1.0; double phatSample = sin(inputSample * 1.57079633); inputSample *= 1.2533141373155; //clip to 1.2533141373155 to reach maximum output, or 1.57079633 for pure sine 'phat' version double distSample = sin(inputSample * fabs(inputSample)) / ((fabs(inputSample) == 0.0) ?1:fabs(inputSample)); inputSample = distSample; //purest form is full Spiral if (density < 1.0) inputSample = (drySample*(1-density))+(distSample*density); //fade Spiral aspect if (phattity > 0.0) inputSample = (inputSample*(1-phattity))+(phatSample*phattity); //apply original Density on top Float64 clamp = (lastSampleB - lastSampleC) * 0.381966011250105; clamp -= (lastSampleA - lastSampleB) * 0.6180339887498948482045; clamp += inputSample - lastSampleA; //regular slew clamping added lastSampleC = lastSampleB; lastSampleB = lastSampleA; lastSampleA = inputSample; //now our output relates off lastSampleB if (clamp > threshold) inputSample = lastSampleB + threshold; if (-clamp > threshold) inputSample = lastSampleB - threshold; //slew section lastSampleA = (lastSampleA*0.381966011250105)+(inputSample*0.6180339887498948482045); //split the difference between raw and smoothed for buffer flip = !flip; if (output < 1.0) { inputSample *= output; } if (biquadB[0] < 0.49999) { double tempSample = biquadB[2]*inputSample+biquadB[3]*biquadB[7]+biquadB[4]*biquadB[8]-biquadB[5]*biquadB[9]-biquadB[6]*biquadB[10]; biquadB[8] = biquadB[7]; biquadB[7] = inputSample; if (fabs(tempSample)<1.18e-37) tempSample = 0.0; inputSample = tempSample; biquadB[10] = biquadB[9]; biquadB[9] = inputSample; //DF1 } //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; } }