/*
* File: BrassRider.cpp
*
* Version: 1.0
*
* Created: 5/15/10
*
* Copyright: Copyright � 2010 Airwindows, All Rights Reserved
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/*=============================================================================
BrassRider.h
=============================================================================*/
#include "BrassRider.h"
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMPONENT_ENTRY(BrassRider)
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BrassRider::BrassRider
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BrassRider::BrassRider(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
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BrassRider::GetParameterValueStrings
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BrassRider::GetParameterValueStrings(AudioUnitScope inScope,
AudioUnitParameterID inParameterID,
CFArrayRef * outStrings)
{
return kAudioUnitErr_InvalidProperty;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BrassRider::GetParameterInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BrassRider::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;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BrassRider::GetPropertyInfo
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BrassRider::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 BrassRider::SupportedNumChannels(const AUChannelInfo ** outInfo)
{
if (outInfo != NULL)
{
static AUChannelInfo info;
info.inChannels = 2;
info.outChannels = 2;
*outInfo = &info;
}
return 1;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BrassRider::GetProperty
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BrassRider::GetProperty( AudioUnitPropertyID inID,
AudioUnitScope inScope,
AudioUnitElement inElement,
void * outData )
{
return AUEffectBase::GetProperty (inID, inScope, inElement, outData);
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BrassRider::Initialize
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ComponentResult BrassRider::Initialize()
{
ComponentResult result = AUEffectBase::Initialize();
if (result == noErr)
Reset(kAudioUnitScope_Global, 0);
return result;
}
#pragma mark ____BrassRiderEffectKernel
//-----------------------------------------------------------------------------------------
// this is called the reset the DSP state (clear buffers, reset counters, etc.)
ComponentResult BrassRider::Reset(AudioUnitScope inScope, AudioUnitElement inElement)
{
for(int count = 0; count < 80001; count++) {d[count] = 0.0; e[count] = 0.0;}
control = 0.0;
clamp = 0.0;
highIIRL = 0.0;
slewIIRL = 0.0;
highIIR2L = 0.0;
slewIIR2L = 0.0;
lastSampleL = 0.0;
lastSlewL = 0.0;
highIIRR = 0.0;
slewIIRR = 0.0;
highIIR2R = 0.0;
slewIIR2R = 0.0;
lastSampleR = 0.0;
lastSlewR = 0.0;
gcount = 0;
fpd = 17;
return noErr;
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// BrassRider::ProcessBufferLists
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
OSStatus BrassRider::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;
Float64 limitOut = GetParameter( kParam_One )*16;
int offsetA = 13500;
int offsetB = 16700;
Float64 wet = GetParameter( kParam_Two );
while (nSampleFrames-- > 0) {
long double inputSampleL = *inputL;
long double inputSampleR = *inputR;
//assign working variables
if (inputSampleL<1.2e-38 && -inputSampleL<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;
inputSampleL = applyresidue;
}
if (inputSampleR<1.2e-38 && -inputSampleR<1.2e-38) {
static int noisesource = 0;
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;
inputSampleR = 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.
}
long double drySampleL = inputSampleL;
long double drySampleR = inputSampleR;
inputSampleL *= limitOut;
highIIRL = (highIIRL*0.5);
highIIRL += (inputSampleL*0.5);
inputSampleL -= highIIRL;
highIIR2L = (highIIR2L*0.5);
highIIR2L += (inputSampleL*0.5);
inputSampleL -= highIIR2L;
long double slewSampleL = fabs(inputSampleL - lastSampleL);
lastSampleL = inputSampleL;
slewSampleL /= fabs(inputSampleL * lastSampleL)+0.2;
slewIIRL = (slewIIRL*0.5);
slewIIRL += (slewSampleL*0.5);
slewSampleL = fabs(slewSampleL - slewIIRL);
slewIIR2L = (slewIIR2L*0.5);
slewIIR2L += (slewSampleL*0.5);
slewSampleL = fabs(slewSampleL - slewIIR2L);
long double bridgerectifier = slewSampleL;
//there's the left channel, now to feed it to overall clamp
if (bridgerectifier > 3.1415) bridgerectifier = 0.0;
bridgerectifier = sin(bridgerectifier);
if (gcount < 0 || gcount > 40000) {gcount = 40000;}
d[gcount+40000] = d[gcount] = bridgerectifier;
control += (d[gcount] / (offsetA+1));
control -= (d[gcount+offsetA] / offsetA);
Float64 ramp = (control*control) * 16.0;
e[gcount+40000] = e[gcount] = ramp;
clamp += (e[gcount] / (offsetB+1));
clamp -= (e[gcount+offsetB] / offsetB);
if (clamp > wet*8) clamp = wet*8;
gcount--;
inputSampleR *= limitOut;
highIIRR = (highIIRR*0.5);
highIIRR += (inputSampleR*0.5);
inputSampleR -= highIIRR;
highIIR2R = (highIIR2R*0.5);
highIIR2R += (inputSampleR*0.5);
inputSampleR -= highIIR2R;
long double slewSampleR = fabs(inputSampleR - lastSampleR);
lastSampleR = inputSampleR;
slewSampleR /= fabs(inputSampleR * lastSampleR)+0.2;
slewIIRR = (slewIIRR*0.5);
slewIIRR += (slewSampleR*0.5);
slewSampleR = fabs(slewSampleR - slewIIRR);
slewIIR2R = (slewIIR2R*0.5);
slewIIR2R += (slewSampleR*0.5);
slewSampleR = fabs(slewSampleR - slewIIR2R);
bridgerectifier = slewSampleR;
//there's the right channel, now to feed it to overall clamp
if (bridgerectifier > 3.1415) bridgerectifier = 0.0;
bridgerectifier = sin(bridgerectifier);
if (gcount < 0 || gcount > 40000) {gcount = 40000;}
d[gcount+40000] = d[gcount] = bridgerectifier;
control += (d[gcount] / (offsetA+1));
control -= (d[gcount+offsetA] / offsetA);
ramp = (control*control) * 16.0;
e[gcount+40000] = e[gcount] = ramp;
clamp += (e[gcount] / (offsetB+1));
clamp -= (e[gcount+offsetB] / offsetB);
if (clamp > wet*8) clamp = wet*8;
gcount--;
inputSampleL = (drySampleL * (1.0-wet)) + (drySampleL * clamp * wet * 16.0);
inputSampleR = (drySampleR * (1.0-wet)) + (drySampleR * clamp * wet * 16.0);
//begin 32 bit stereo floating point dither
int expon; frexpf((float)inputSampleL, &expon);
fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
inputSampleL += static_cast<int32_t>(fpd) * 5.960464655174751e-36L * pow(2,expon+62);
frexpf((float)inputSampleR, &expon);
fpd ^= fpd << 13; fpd ^= fpd >> 17; fpd ^= fpd << 5;
inputSampleR += static_cast<int32_t>(fpd) * 5.960464655174751e-36L * pow(2,expon+62);
//end 32 bit stereo floating point dither
*outputL = inputSampleL;
*outputR = inputSampleR;
inputL += 1;
inputR += 1;
outputL += 1;
outputR += 1;
}
return noErr;
}
