diff options
Diffstat (limited to 'plugins/MacAU/Tremolo/Tremolo.cpp')
| -rwxr-xr-x | plugins/MacAU/Tremolo/Tremolo.cpp | 313 |
1 files changed, 313 insertions, 0 deletions
diff --git a/plugins/MacAU/Tremolo/Tremolo.cpp b/plugins/MacAU/Tremolo/Tremolo.cpp new file mode 100755 index 0000000..e70b244 --- /dev/null +++ b/plugins/MacAU/Tremolo/Tremolo.cpp @@ -0,0 +1,313 @@ +/* +* File: Tremolo.cpp +* +* Version: 1.0 +* +* Created: 9/16/07 +* +* Copyright: Copyright © 2007 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. +* +*/ +/*============================================================================= + Tremolo.h + +=============================================================================*/ +#include "Tremolo.h" + + +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +COMPONENT_ENTRY(Tremolo) + + +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +// Tremolo::Tremolo +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Tremolo::Tremolo(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 + +} + + +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +// Tremolo::GetParameterValueStrings +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +ComponentResult Tremolo::GetParameterValueStrings(AudioUnitScope inScope, + AudioUnitParameterID inParameterID, + CFArrayRef * outStrings) +{ + + return kAudioUnitErr_InvalidProperty; +} + + + +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +// Tremolo::GetParameterInfo +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +ComponentResult Tremolo::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 = 0.0; + outParameterInfo.maxValue = 1.0; + outParameterInfo.defaultValue = kDefaultValue_ParamTwo; + break; + default: + result = kAudioUnitErr_InvalidParameter; + break; + } + } else { + result = kAudioUnitErr_InvalidParameter; + } + + + + return result; +} + +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +// Tremolo::GetPropertyInfo +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +ComponentResult Tremolo::GetPropertyInfo (AudioUnitPropertyID inID, + AudioUnitScope inScope, + AudioUnitElement inElement, + UInt32 & outDataSize, + Boolean & outWritable) +{ + return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable); +} + +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +// Tremolo::GetProperty +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +ComponentResult Tremolo::GetProperty( AudioUnitPropertyID inID, + AudioUnitScope inScope, + AudioUnitElement inElement, + void * outData ) +{ + return AUEffectBase::GetProperty (inID, inScope, inElement, outData); +} + +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +// Tremolo::Initialize +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +ComponentResult Tremolo::Initialize() +{ + ComponentResult result = AUEffectBase::Initialize(); + if (result == noErr) + Reset(kAudioUnitScope_Global, 0); + return result; +} + +#pragma mark ____TremoloEffectKernel + + +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +// Tremolo::TremoloKernel::Reset() +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +void Tremolo::TremoloKernel::Reset() +{ + sweep = 3.141592653589793238 / 2.0; + speedChase = 0.0; + depthChase = 0.0; + speedAmount = 1.0; + depthAmount = 0.0; + lastSpeed = 1000.0; + lastDepth = 1000.0; + fpNShapeA = 0.0; + fpNShapeB = 0.0; + fpFlip = true; +} + +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +// Tremolo::TremoloKernel::Process +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +void Tremolo::TremoloKernel::Process( const Float32 *inSourceP, + Float32 *inDestP, + UInt32 inFramesToProcess, + UInt32 inNumChannels, // for version 2 AudioUnits inNumChannels is always 1 + bool &ioSilence ) +{ + + UInt32 nSampleFrames = inFramesToProcess; + const Float32 *sourceP = inSourceP; + Float32 *destP = inDestP; + Float64 overallscale = 1.0; + overallscale /= 44100.0; + overallscale *= GetSampleRate(); + + speedChase = pow(GetParameter( kParam_One ),4); + depthChase = GetParameter( kParam_Two ); + Float64 speedSpeed = 300 / (fabs( lastSpeed - speedChase)+1.0); + Float64 depthSpeed = 300 / (fabs( lastDepth - depthChase)+1.0); + lastSpeed = speedChase; + lastDepth = depthChase; + + Float64 speed; + Float64 depth; + Float64 skew; + Float64 density; + + Float64 tupi = 3.141592653589793238; + long double inputSample; + long double drySample; + Float64 control; + Float64 tempcontrol; + Float64 thickness; + Float64 out; + Float64 bridgerectifier; + Float64 offset; + Float32 fpTemp; + Float64 fpOld = 0.618033988749894848204586; //golden ratio! + Float64 fpNew = 1.0 - fpOld; + + 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; + + speedAmount = (((speedAmount*speedSpeed)+speedChase)/(speedSpeed + 1.0)); + depthAmount = (((depthAmount*depthSpeed)+depthChase)/(depthSpeed + 1.0)); + speed = 0.0001+(speedAmount/1000.0); + speed /= overallscale; + depth = 1.0 - pow(1.0-depthAmount,5); + skew = 1.0+pow(depthAmount,9); + density = ((1.0-depthAmount)*2.0) - 1.0; + + offset = sin(sweep); + sweep += speed; + if (sweep > tupi){sweep -= tupi;} + control = fabs(offset); + if (density > 0) + { + tempcontrol = sin(control); + control = (control * (1.0-density))+(tempcontrol * density); + } + else + { + tempcontrol = 1-cos(control); + control = (control * (1.0+density))+(tempcontrol * -density); + } + //produce either boosted or starved version of control signal + //will go from 0 to 1 + + thickness = ((control * 2.0) - 1.0)*skew; + out = fabs(thickness); + bridgerectifier = fabs(inputSample); + if (bridgerectifier > 1.57079633) bridgerectifier = 1.57079633; + //max value for sine function + if (thickness > 0) bridgerectifier = sin(bridgerectifier); + else bridgerectifier = 1-cos(bridgerectifier); + //produce either boosted or starved version + if (inputSample > 0) inputSample = (inputSample*(1-out))+(bridgerectifier*out); + else inputSample = (inputSample*(1-out))-(bridgerectifier*out); + //blend according to density control + inputSample *= (1.0 - control); + inputSample *= 2.0; + //apply tremolo, apply gain boost to compensate for volume loss + inputSample = (drySample * (1-depth)) + (inputSample*depth); + + //noise shaping to 32-bit floating point + if (fpFlip) { + fpTemp = inputSample; + fpNShapeA = (fpNShapeA*fpOld)+((inputSample-fpTemp)*fpNew); + inputSample += fpNShapeA; + } + else { + fpTemp = inputSample; + fpNShapeB = (fpNShapeB*fpOld)+((inputSample-fpTemp)*fpNew); + inputSample += fpNShapeB; + } + fpFlip = !fpFlip; + //end noise shaping on 32 bit output + + + + *destP = inputSample; + destP += inNumChannels; + sourceP += inNumChannels; + } +} + |