github-starred/airwindows
2
0
Fork 0
mirror of https://github.com/airwindows/airwindows.git synced 2026-05-15 14:16:00 -06:00
Code Issues 33 Projects Packages Wiki Activity Actions
airwindows/plugins/MacAU/Doublelay/Doublelay.cpp
Christopher Johnson f06250c082 Clarifying Licensing in boilerplate code generation
2022-11-21 09:20:21 -05:00

573 lines
22 KiB
C++
Executable file
Raw Permalink Blame History

/*
* File: Doublelay.cpp
*
* Version: 1.0
*
* Created: 8/19/22
*
* Copyright: Copyright © 2022 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. 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.
*
*/
/*=============================================================================
Doublelay.cpp
=============================================================================*/
#include "Doublelay.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMPONENT_ENTRY(Doublelay)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Doublelay::Doublelay
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Doublelay::Doublelay(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
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Doublelay::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Doublelay::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Doublelay::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Doublelay::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 = -1.0;
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;
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 = 1.0;
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;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Doublelay::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Doublelay::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 Doublelay::SupportedNumChannels(const AUChannelInfo ** outInfo)
{
if (outInfo != NULL)
{
static AUChannelInfo info;
info.inChannels = 2;
info.outChannels = 2;
*outInfo = &info;
}
return 1;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Doublelay::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Doublelay::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
// Doublelay::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Doublelay::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____DoublelayEffectKernel
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Doublelay::DoublelayKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult Doublelay::Reset(AudioUnitScope inScope, AudioUnitElement inElement)
{
for(int count = 0; count < 48009; count++) {dL[count] = 0.0; dR[count] = 0.0;}
dcount = 0;
for(int count = 0; count < 5009; count++) {pL[count] = 0.0; pR[count] = 0.0;}
for(int count = 0; count < 8; count++)
{tempL[count] = 0.0; positionL[count] = 0.0; lastpositionL[count] = 0.0; trackingL[count] = 0.0;}
for(int count = 0; count < 8; count++)
{tempR[count] = 0.0; positionR[count] = 0.0; lastpositionR[count] = 0.0; trackingR[count] = 0.0;}
gcountL = 0;
lastcountL = 0;
gcountR = 0;
lastcountR = 0;
prevwidth = 0;
feedbackL = 0.0;
feedbackR = 0.0;
activeL = 0;
bestspliceL = 4;
activeR = 0;
bestspliceR = 4;
bestyetL = 1.0;
bestyetR = 1.0;
airPrevL = 0.0;
airEvenL = 0.0;
airOddL = 0.0;
airFactorL = 0.0;
airPrevR = 0.0;
airEvenR = 0.0;
airOddR = 0.0;
airFactorR = 0.0;
flip = false;
for(int count = 0; count < 6; count++) {lastRefL[count] = 0.0;lastRefR[count] = 0.0;}
cycle = 0;
fpdL = 1.0; while (fpdL < 16386) fpdL = rand()*UINT32_MAX;
fpdR = 1.0; while (fpdR < 16386) fpdR = rand()*UINT32_MAX;
return noErr;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Doublelay::ProcessBufferLists
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
OSStatus Doublelay::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;
double overallscale = 1.0;
overallscale /= 44100.0;
overallscale *= GetSampleRate();
int cycleEnd = floor(overallscale);
if (cycleEnd < 1) cycleEnd = 1;
if (cycleEnd > 4) cycleEnd = 4;
//this is going to be 2 for 88.1 or 96k, 3 for silly people, 4 for 176 or 192k
if (cycle > cycleEnd-1) cycle = cycleEnd-1; //sanity check
double delayTrim = (GetSampleRate()/cycleEnd)/48001.0; //this gives us a time adjustment
if (delayTrim > 0.99999) delayTrim = 0.99999; //sanity check so we don't smash our delay buffer
if (delayTrim < 0.0) delayTrim = 0.0; //sanity check so we don't smash our delay buffer
double trim = GetParameter( kParam_One );
trim *= fabs(trim);
trim /= 40;
double speedL = trim+1.0;
double speedR = (-trim)+1.0;
if (speedL < 0.0) speedL = 0.0;
if (speedR < 0.0) speedR = 0.0;
int delayL = (GetParameter( kParam_Two )*(int)(48000.0*delayTrim));
int delayR = (GetParameter( kParam_Three )*(int)(48000.0*delayTrim));
//this now adjusts to give exactly one second max delay at all times up to 48k
//or multipliers of it using undersampling
double adjust = 1100;
int width = 2300;
if (prevwidth != width)
{
positionL[0] = 0;
positionL[1] = (int)(width/3);
positionL[2] = (int)((width/3)*2);
positionL[3] = (int)(width/5);
positionL[4] = (int)((width/5)*2);
positionL[5] = (int)((width/5)*3);
positionL[6] = (int)((width/5)*4);
positionL[7] = (int)(width/2);
positionR[0] = 0;
positionR[1] = (int)(width/3);
positionR[2] = (int)((width/3)*2);
positionR[3] = (int)(width/5);
positionR[4] = (int)((width/5)*2);
positionR[5] = (int)((width/5)*3);
positionR[6] = (int)((width/5)*4);
positionR[7] = (int)(width/2);
prevwidth = width;
}
double feedbackDirect = GetParameter( kParam_Four ) * 0.618033988749894848204586;
double feedbackCross = GetParameter( kParam_Four ) * (1.0-0.618033988749894848204586);
double wet = GetParameter( kParam_Five );
int gplusL;
int lastplusL;
int gplusR;
int lastplusR;
double posplusL;
double lastposplusL;
double posplusR;
double lastposplusR;
double depth;
double crossfade;
int count;
int bcountL;
int bcountR;
int base;
while (nSampleFrames-- > 0) {
double inputSampleL = *inputL;
double inputSampleR = *inputR;
if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
cycle++;
if (cycle == cycleEnd) { //hit the end point and we do a doubler sample
double drySampleL = inputSampleL;
double drySampleR = inputSampleR;
//assign working variables
airFactorL = airPrevL - inputSampleL;
if (flip) {airEvenL += airFactorL; airOddL -= airFactorL; airFactorL = airEvenL;}
else {airOddL += airFactorL; airEvenL -= airFactorL; airFactorL = airOddL;}
airOddL = (airOddL - ((airOddL - airEvenL)/256.0)) / 1.0001;
airEvenL = (airEvenL - ((airEvenL - airOddL)/256.0)) / 1.0001;
airPrevL = inputSampleL;
inputSampleL += airFactorL;
//left
airFactorR = airPrevR - inputSampleR;
if (flip) {airEvenR += airFactorR; airOddR -= airFactorR; airFactorR = airEvenR;}
else {airOddR += airFactorR; airEvenR -= airFactorR; airFactorR = airOddR;}
airOddR = (airOddR - ((airOddR - airEvenR)/256.0)) / 1.0001;
airEvenR = (airEvenR - ((airEvenR - airOddR)/256.0)) / 1.0001;
airPrevR = inputSampleR;
inputSampleR += airFactorR;
//right
flip = !flip;
//air, compensates for loss of highs in flanger's interpolation
inputSampleL += feedbackL*feedbackDirect;
inputSampleR += feedbackR*feedbackDirect;
inputSampleL += feedbackR*feedbackCross;
inputSampleR += feedbackL*feedbackCross;
if (dcount < 1 || dcount > 48005) dcount = 48005;
count = dcount;
dL[count] = inputSampleL;
dR[count] = inputSampleR;
//double buffer
inputSampleL = dL[count+delayL-((count+delayL>48005)?48005:0)];
inputSampleR = dR[count+delayR-((count+delayR>48005)?48005:0)];
//assign delays
dcount--;
gcountL++;
gcountR++;
for(count = 0; count < 8; count++) {positionL[count] += speedL; positionR[count] += speedR;}
gplusL = gcountL+(int)adjust;
lastplusL = lastcountL+(int)adjust;
if (gplusL > width) {gplusL -= width;}
if (lastplusL > width) {lastplusL -= width;}
gplusR = gcountR+(int)adjust;
lastplusR = lastcountR+(int)adjust;
if (gplusR > width) {gplusR -= width;}
if (lastplusR > width) {lastplusR -= width;}
if (trackingL[activeL] == 0.0)
{
posplusL = positionL[activeL]+adjust;
lastposplusL = lastpositionL[activeL]+adjust;
if (posplusL > width) {posplusL -= width;}
if (lastposplusL > width) {lastposplusL -= width;}
if ((gplusL > positionL[activeL]) && (lastplusL < lastpositionL[activeL])) {trackingL[activeL] = 1.0;}
if ((posplusL > gcountL) && (lastposplusL < lastcountL)) {trackingL[activeL] = 1.0;}
//fire splice based on whether somebody moved past somebody else just now
}
if (trackingR[activeR] == 0.0)
{
posplusR = positionR[activeR]+adjust;
lastposplusR = lastpositionR[activeR]+adjust;
if (posplusR > width) {posplusR -= width;}
if (lastposplusR > width) {lastposplusR -= width;}
if ((gplusR > positionR[activeR]) && (lastplusR < lastpositionR[activeR])) {trackingR[activeR] = 1.0;}
if ((posplusR > gcountR) && (lastposplusR < lastcountR)) {trackingR[activeR] = 1.0;}
//fire splice based on whether somebody moved past somebody else just now
}
for(count = 0; count < 8; count++)
{
if (positionL[count] > width) {positionL[count] -= width;}
if (positionR[count] > width) {positionR[count] -= width;}
lastpositionL[count] = positionL[count];
lastpositionR[count] = positionR[count];
}
if (gcountL < 0 || gcountL > width) {gcountL -= width;}
lastcountL = bcountL = gcountL;
if (gcountR < 0 || gcountR > width) {gcountR -= width;}
lastcountR = bcountR = gcountR;
pL[bcountL+width] = pL[bcountL] = inputSampleL;
pR[bcountR+width] = pR[bcountR] = inputSampleR;
for(count = 0; count < 8; count++)
{
base = (int)floor(positionL[count]);
tempL[count] = (pL[base] * (1-(positionL[count]-base))); //less as value moves away from .0
tempL[count] += pL[base+1]; //we can assume always using this in one way or another?
tempL[count] += (pL[base+2] * (positionL[count]-base)); //greater as value moves away from .0
tempL[count] -= (((pL[base]-pL[base+1])-(pL[base+1]-pL[base+2]))/50); //interpolation hacks 'r us
tempL[count] /= 2;
base = (int)floor(positionR[count]);
tempR[count] = (pR[base] * (1-(positionR[count]-base))); //less as value moves away from .0
tempR[count] += pR[base+1]; //we can assume always using this in one way or another?
tempR[count] += (pR[base+2] * (positionR[count]-base)); //greater as value moves away from .0
tempR[count] -= (((pR[base]-pR[base+1])-(pR[base+1]-pR[base+2]))/50); //interpolation hacks 'r us
tempR[count] /= 2;
}
if (trackingL[activeL] > 0.0)
{
crossfade = sin(trackingL[bestspliceL]*1.57);
inputSampleL = (tempL[activeL]*crossfade)+(tempL[bestspliceL]*(1.0-crossfade));
for(count = 0; count < 8; count++)
{
depth = (0.5-fabs(tempL[activeL]-tempL[count]));
if ((depth > 0) && (count != activeL))
{trackingL[count] -= (depth/adjust);
bestspliceL = count;}
//take down the splicings but skip the current one
}
bestyetL = 1.0;
for(count = 0; count < 8; count++)
{
if ((trackingL[count] < bestyetL)&&(count != activeL))
{bestspliceL = count; bestyetL = trackingL[count];}
}
if (trackingL[bestspliceL] < 0.0)
{
for(count = 0; count < 8; count++)
{trackingL[count] = 1.0;}
activeL = bestspliceL;
trackingL[activeL] = 0.0;
}
}
else inputSampleL = tempL[activeL];
if (trackingR[activeR] > 0.0)
{
crossfade = sin(trackingR[bestspliceR]*1.57);
inputSampleR = (tempR[activeR]*crossfade)+(tempR[bestspliceR]*(1.0-crossfade));
for(count = 0; count < 8; count++)
{
depth = (0.5-fabs(tempR[activeR]-tempR[count]));
if ((depth > 0) && (count != activeR))
{trackingR[count] -= (depth/adjust); bestspliceR = count;}
//take down the splicings but skip the current one
}
bestyetR = 1.0;
for(count = 0; count < 8; count++)
{
if ((trackingR[count] < bestyetR)&&(count != activeR))
{bestspliceR = count; bestyetR = trackingR[count];}
}
if (trackingR[bestspliceR] < 0.0)
{
for(count = 0; count < 8; count++)
{trackingR[count] = 1.0;}
activeR = bestspliceR;
trackingR[activeR] = 0.0;
}
}
else inputSampleR = tempR[activeR];
feedbackL = inputSampleL;
feedbackR = inputSampleR;
//feedback section
inputSampleL = (inputSampleL * wet) + (drySampleL * (1.0-wet));
inputSampleR = (inputSampleR * wet) + (drySampleR * (1.0-wet));
if (cycleEnd == 4) {
lastRefL[0] = lastRefL[4]; //start from previous last
lastRefL[2] = (lastRefL[0] + inputSampleL)/2; //half
lastRefL[1] = (lastRefL[0] + lastRefL[2])/2; //one quarter
lastRefL[3] = (lastRefL[2] + inputSampleL)/2; //three quarters
lastRefL[4] = inputSampleL; //full
lastRefR[0] = lastRefR[4]; //start from previous last
lastRefR[2] = (lastRefR[0] + inputSampleR)/2; //half
lastRefR[1] = (lastRefR[0] + lastRefR[2])/2; //one quarter
lastRefR[3] = (lastRefR[2] + inputSampleR)/2; //three quarters
lastRefR[4] = inputSampleR; //full
}
if (cycleEnd == 3) {
lastRefL[0] = lastRefL[3]; //start from previous last
lastRefL[2] = (lastRefL[0]+lastRefL[0]+inputSampleL)/3; //third
lastRefL[1] = (lastRefL[0]+inputSampleL+inputSampleL)/3; //two thirds
lastRefL[3] = inputSampleL; //full
lastRefR[0] = lastRefR[3]; //start from previous last
lastRefR[2] = (lastRefR[0]+lastRefR[0]+inputSampleR)/3; //third
lastRefR[1] = (lastRefR[0]+inputSampleR+inputSampleR)/3; //two thirds
lastRefR[3] = inputSampleR; //full
}
if (cycleEnd == 2) {
lastRefL[0] = lastRefL[2]; //start from previous last
lastRefL[1] = (lastRefL[0] + inputSampleL)/2; //half
lastRefL[2] = inputSampleL; //full
lastRefR[0] = lastRefR[2]; //start from previous last
lastRefR[1] = (lastRefR[0] + inputSampleR)/2; //half
lastRefR[2] = inputSampleR; //full
}
if (cycleEnd == 1) {
lastRefL[0] = inputSampleL;
lastRefR[0] = inputSampleR;
}
cycle = 0; //reset
inputSampleL = lastRefL[cycle];
inputSampleR = lastRefR[cycle];
} else {
inputSampleL = lastRefL[cycle];
inputSampleR = lastRefR[cycle];
//we are going through our references now
}
//begin 32 bit stereo floating point dither
int expon; frexpf((float)inputSampleL, &expon);
fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
frexpf((float)inputSampleR, &expon);
fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
inputSampleR += ((double(fpdR)-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;
}
Reference in a new issue View git blame Copy permalink