/* * File: BiquadStereo.cpp * * Version: 1.0 * * Created: 6/29/19 * * 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. 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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. * */ /*============================================================================= BiquadStereo.cpp =============================================================================*/ #include "BiquadStereo.h" //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ COMPONENT_ENTRY(BiquadStereo) //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // BiquadStereo::BiquadStereo //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ BiquadStereo::BiquadStereo(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 } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // BiquadStereo::GetParameterValueStrings //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult BiquadStereo::GetParameterValueStrings(AudioUnitScope inScope, AudioUnitParameterID inParameterID, CFArrayRef * outStrings) { return kAudioUnitErr_InvalidProperty; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // BiquadStereo::GetParameterInfo //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult BiquadStereo::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 = 1.0; outParameterInfo.maxValue = 4.0; outParameterInfo.defaultValue = kDefaultValue_ParamOne; break; case kParam_Two: AUBase::FillInParameterName (outParameterInfo, kParameterTwoName, false); outParameterInfo.unit = kAudioUnitParameterUnit_Generic; outParameterInfo.flags |= kAudioUnitParameterFlag_DisplayLogarithmic; outParameterInfo.minValue = 0.0001; outParameterInfo.maxValue = 1.0; outParameterInfo.defaultValue = kDefaultValue_ParamTwo; break; case kParam_Three: AUBase::FillInParameterName (outParameterInfo, kParameterThreeName, false); outParameterInfo.unit = kAudioUnitParameterUnit_Generic; outParameterInfo.flags |= kAudioUnitParameterFlag_DisplayLogarithmic; outParameterInfo.minValue = 0.01; outParameterInfo.maxValue = 30.0; outParameterInfo.defaultValue = kDefaultValue_ParamThree; break; case kParam_Four: AUBase::FillInParameterName (outParameterInfo, kParameterFourName, false); outParameterInfo.unit = kAudioUnitParameterUnit_Generic; outParameterInfo.minValue = -1.0; outParameterInfo.maxValue = 1.0; outParameterInfo.defaultValue = kDefaultValue_ParamFour; break; default: result = kAudioUnitErr_InvalidParameter; break; } } else { result = kAudioUnitErr_InvalidParameter; } return result; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // BiquadStereo::GetPropertyInfo //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult BiquadStereo::GetPropertyInfo (AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, UInt32 & outDataSize, Boolean & outWritable) { return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable); } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // state that plugin supports only stereo-in/stereo-out processing UInt32 BiquadStereo::SupportedNumChannels(const AUChannelInfo ** outInfo) { if (outInfo != NULL) { static AUChannelInfo info; info.inChannels = 2; info.outChannels = 2; *outInfo = &info; } return 1; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // BiquadStereo::GetProperty //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult BiquadStereo::GetProperty( AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, void * outData ) { return AUEffectBase::GetProperty (inID, inScope, inElement, outData); } // BiquadStereo::Initialize //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult BiquadStereo::Initialize() { ComponentResult result = AUEffectBase::Initialize(); if (result == noErr) Reset(kAudioUnitScope_Global, 0); return result; } #pragma mark ____BiquadStereoEffectKernel //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // BiquadStereo::BiquadStereoKernel::Reset() //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ComponentResult BiquadStereo::Reset(AudioUnitScope inScope, AudioUnitElement inElement) { for (int x = 0; x < 11; x++) {biquad[x] = 0.0;} fpd = 17; return noErr; } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // BiquadStereo::ProcessBufferLists //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ OSStatus BiquadStereo::ProcessBufferLists(AudioUnitRenderActionFlags & ioActionFlags, const AudioBufferList & inBuffer, AudioBufferList & outBuffer, UInt32 inFramesToProcess) { Float32 * inputL = (Float32*)(inBuffer.mBuffers[0].mData); Float32 * inputR = (Float32*)(inBuffer.mBuffers[1].mData); Float32 * outputL = (Float32*)(outBuffer.mBuffers[0].mData); Float32 * outputR = (Float32*)(outBuffer.mBuffers[1].mData); UInt32 nSampleFrames = inFramesToProcess; long double overallscale = 1.0; overallscale /= 44100.0; overallscale *= GetSampleRate(); int type = GetParameter( kParam_One); biquad[0] = GetParameter( kParam_Two )*0.499; if (biquad[0] < 0.0001) biquad[0] = 0.0001; biquad[1] = GetParameter( kParam_Three ); if (biquad[1] < 0.0001) biquad[1] = 0.0001; Float64 wet = GetParameter( kParam_Four ); //biquad contains these values: //[0] is frequency: 0.000001 to 0.499999 is near-zero to near-Nyquist //[1] is resonance, 0.7071 is Butterworth. Also can't be zero //[2] is a0 but you need distinct ones for additional biquad instances so it's here //[3] is a1 but you need distinct ones for additional biquad instances so it's here //[4] is a2 but you need distinct ones for additional biquad instances so it's here //[5] is b1 but you need distinct ones for additional biquad instances so it's here //[6] is b2 but you need distinct ones for additional biquad instances so it's here //[7] is LEFT stored delayed sample (freq and res are stored so you can move them sample by sample) //[8] is LEFT stored delayed sample (you have to include the coefficient making code if you do that) //[9] is RIGHT stored delayed sample (freq and res are stored so you can move them sample by sample) //[10] is RIGHT stored delayed sample (you have to include the coefficient making code if you do that) //to build a dedicated filter, rename 'biquad' to whatever the new filter is, then //put this code either within the sample buffer (for smoothly modulating freq or res) //or in this 'read the controls' area (for letting you change freq and res with controls) //or in 'reset' if the freq and res are absolutely fixed (use GetSampleRate to define freq) if (type == 1) { //lowpass double K = tan(M_PI * biquad[0]); double norm = 1.0 / (1.0 + K / biquad[1] + K * K); biquad[2] = K * K * norm; biquad[3] = 2.0 * biquad[2]; biquad[4] = biquad[2]; biquad[5] = 2.0 * (K * K - 1.0) * norm; biquad[6] = (1.0 - K / biquad[1] + K * K) * norm; } if (type == 2) { //highpass double K = tan(M_PI * biquad[0]); double norm = 1.0 / (1.0 + K / biquad[1] + K * K); biquad[2] = norm; biquad[3] = -2.0 * biquad[2]; biquad[4] = biquad[2]; biquad[5] = 2.0 * (K * K - 1.0) * norm; biquad[6] = (1.0 - K / biquad[1] + K * K) * norm; } if (type == 3) { //bandpass double K = tan(M_PI * biquad[0]); double norm = 1.0 / (1.0 + K / biquad[1] + K * K); biquad[2] = K / biquad[1] * norm; biquad[3] = 0.0; //bandpass can simplify the biquad kernel: leave out this multiply biquad[4] = -biquad[2]; biquad[5] = 2.0 * (K * K - 1.0) * norm; biquad[6] = (1.0 - K / biquad[1] + K * K) * norm; } if (type == 4) { //notch double K = tan(M_PI * biquad[0]); double norm = 1.0 / (1.0 + K / biquad[1] + K * K); biquad[2] = (1.0 + K * K) * norm; biquad[3] = 2.0 * (K * K - 1) * norm; biquad[4] = biquad[2]; biquad[5] = biquad[3]; biquad[6] = (1.0 - K / biquad[1] + K * K) * norm; } while (nSampleFrames-- > 0) { long double inputSampleL = *inputL; long double inputSampleR = *inputR; if (fabs(inputSampleL)<1.18e-37) inputSampleL = fpd * 1.18e-37; if (fabs(inputSampleR)<1.18e-37) inputSampleR = fpd * 1.18e-37; long double drySampleL = inputSampleL; long double drySampleR = inputSampleR; inputSampleL = sin(inputSampleL); inputSampleR = sin(inputSampleR); //encode Console5: good cleanness /* long double mid = inputSampleL + inputSampleR; long double side = inputSampleL - inputSampleR; //assign mid and side.Between these sections, you can do mid/side processing long double tempSampleM = (mid * biquad[2]) + biquad[7]; biquad[7] = (mid * biquad[3]) - (tempSampleM * biquad[5]) + biquad[8]; biquad[8] = (mid * biquad[4]) - (tempSampleM * biquad[6]); mid = tempSampleM; //like mono AU, 7 and 8 store mid channel long double tempSampleS = (side * biquad[2]) + biquad[9]; biquad[9] = (side * biquad[3]) - (tempSampleS * biquad[5]) + biquad[10]; biquad[10] = (side * biquad[4]) - (tempSampleS * biquad[6]); inputSampleR = tempSampleS; //note: 9 and 10 store the side channel inputSampleL = (mid+side)/2.0; inputSampleR = (mid-side)/2.0; //unassign mid and side */ long double tempSampleL = (inputSampleL * biquad[2]) + biquad[7]; biquad[7] = (inputSampleL * biquad[3]) - (tempSampleL * biquad[5]) + biquad[8]; biquad[8] = (inputSampleL * biquad[4]) - (tempSampleL * biquad[6]); inputSampleL = tempSampleL; //like mono AU, 7 and 8 store L channel long double tempSampleR = (inputSampleR * biquad[2]) + biquad[9]; biquad[9] = (inputSampleR * biquad[3]) - (tempSampleR * biquad[5]) + biquad[10]; biquad[10] = (inputSampleR * biquad[4]) - (tempSampleR * biquad[6]); inputSampleR = tempSampleR; //note: 9 and 10 store the R channel if (inputSampleL > 1.0) inputSampleL = 1.0; if (inputSampleL < -1.0) inputSampleL = -1.0; if (inputSampleR > 1.0) inputSampleR = 1.0; if (inputSampleR < -1.0) inputSampleR = -1.0; //without this, you can get a NaN condition where it spits out DC offset at full blast! inputSampleL = asin(inputSampleL); inputSampleR = asin(inputSampleR); //amplitude aspect if (wet < 1.0) { inputSampleL = (inputSampleL*wet) + (drySampleL*(1.0-fabs(wet))); inputSampleR = (inputSampleR*wet) + (drySampleR*(1.0-fabs(wet))); //inv/dry/wet lets us turn LP into HP and band into notch } //begin 32 bit stereo floating point dither int expon; frexpf((float)inputSampleL, &expon); fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5; inputSampleL += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62)); frexpf((float)inputSampleR, &expon); fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5; inputSampleR += ((double(fpd)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62)); //end 32 bit stereo floating point dither *outputL = inputSampleL; *outputR = inputSampleR; //direct stereo out inputL += 1; inputR += 1; outputL += 1; outputR += 1; } return noErr; }