/*
* File: VinylDither.cpp
*
* Version: 1.0
*
* Created: 11/17/16
*
* Copyright: Copyright � 2016 Airwindows, All Rights Reserved
*
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/*=============================================================================
VinylDither.cpp
=============================================================================*/
#include "VinylDither.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMPONENT_ENTRY(VinylDither)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// VinylDither::VinylDither
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
VinylDither::VinylDither(AudioUnit component)
: AUEffectBase(component)
{
CreateElements();
Globals()->UseIndexedParameters(kNumberOfParameters);
#if AU_DEBUG_DISPATCHER
mDebugDispatcher = new AUDebugDispatcher (this);
#endif
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// VinylDither::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult VinylDither::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// VinylDither::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult VinylDither::GetParameterInfo(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
AudioUnitParameterInfo &outParameterInfo )
{
ComponentResult result = noErr;
outParameterInfo.flags = kAudioUnitParameterFlag_IsWritable
| kAudioUnitParameterFlag_IsReadable;
if (inScope == kAudioUnitScope_Global) {
switch(inParameterID)
{
default:
result = kAudioUnitErr_InvalidParameter;
break;
}
} else {
result = kAudioUnitErr_InvalidParameter;
}
return result;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// VinylDither::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult VinylDither::GetPropertyInfo (AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
UInt32 & outDataSize,
Boolean & outWritable)
{
return AUEffectBase::GetPropertyInfo (inID, inScope, inElement, outDataSize, outWritable);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// VinylDither::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult VinylDither::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
// VinylDither::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult VinylDither::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____VinylDitherEffectKernel
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// VinylDither::VinylDitherKernel::Reset()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void VinylDither::VinylDitherKernel::Reset()
{
NSOdd = 0.0;
prev = 0.0;
ns[0] = 0;
ns[1] = 0;
ns[2] = 0;
ns[3] = 0;
ns[4] = 0;
ns[5] = 0;
ns[6] = 0;
ns[7] = 0;
ns[8] = 0;
ns[9] = 0;
ns[10] = 0;
ns[11] = 0;
ns[12] = 0;
ns[13] = 0;
ns[14] = 0;
ns[15] = 0;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// VinylDither::VinylDitherKernel::Process
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
void VinylDither::VinylDitherKernel::Process( const Float32 *inSourceP,
Float32 *inDestP,
UInt32 inFramesToProcess,
UInt32 inNumChannels,
bool &ioSilence )
{
UInt32 nSampleFrames = inFramesToProcess;
const Float32 *sourceP = inSourceP;
Float32 *destP = inDestP;
long double inputSample;
Float64 absSample;
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.
}
inputSample *= 8388608.0;
//0-1 is now one bit, now we dither
absSample = ((rand()/(double)RAND_MAX) - 0.5);
ns[0] += absSample; ns[0] /= 2; absSample -= ns[0];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[1] += absSample; ns[1] /= 2; absSample -= ns[1];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[2] += absSample; ns[2] /= 2; absSample -= ns[2];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[3] += absSample; ns[3] /= 2; absSample -= ns[3];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[4] += absSample; ns[4] /= 2; absSample -= ns[4];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[5] += absSample; ns[5] /= 2; absSample -= ns[5];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[6] += absSample; ns[6] /= 2; absSample -= ns[6];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[7] += absSample; ns[7] /= 2; absSample -= ns[7];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[8] += absSample; ns[8] /= 2; absSample -= ns[8];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[9] += absSample; ns[9] /= 2; absSample -= ns[9];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[10] += absSample; ns[10] /= 2; absSample -= ns[10];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[11] += absSample; ns[11] /= 2; absSample -= ns[11];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[12] += absSample; ns[12] /= 2; absSample -= ns[12];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[13] += absSample; ns[13] /= 2; absSample -= ns[13];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[14] += absSample; ns[14] /= 2; absSample -= ns[14];
absSample += ((rand()/(double)RAND_MAX) - 0.5);
ns[15] += absSample; ns[15] /= 2; absSample -= ns[15];
//install noise and then shape it
absSample += inputSample;
//NSOdd /= 1.0001; //NSDensity
if (NSOdd > 0) NSOdd -= 0.97;
if (NSOdd < 0) NSOdd += 0.97;
NSOdd -= (NSOdd * NSOdd * NSOdd * 0.475);
NSOdd += prev;
absSample += (NSOdd*0.475);
prev = floor(absSample) - inputSample;
inputSample = floor(absSample);
//TenNines dither
inputSample /= 8388608.0;
*destP = inputSample;
sourceP += inNumChannels; destP += inNumChannels;
}
}
