EffectDistortion::Instance Struct Reference

Inheritance diagram for EffectDistortion::Instance:

Collaboration diagram for EffectDistortion::Instance:

Public Member Functions
	Instance (const PerTrackEffect &effect)
bool	ProcessInitialize (EffectSettings &settings, double sampleRate, ChannelNames chanMap) override
size_t	ProcessBlock (EffectSettings &settings, const float *const *inBlock, float *const *outBlock, size_t blockLen) override
	Called for destructive effect computation. More...
bool	RealtimeInitialize (EffectSettings &settings, double) override
bool	RealtimeAddProcessor (EffectSettings &settings, EffectOutputs *pOutputs, unsigned numChannels, float sampleRate) override
bool	RealtimeFinalize (EffectSettings &settings) noexcept override
size_t	RealtimeProcess (size_t group, EffectSettings &settings, const float *const *inbuf, float *const *outbuf, size_t numSamples) override
void	InstanceInit (EffectDistortionState &data, EffectSettings &settings, float sampleRate)
size_t	InstanceProcess (EffectSettings &settings, EffectDistortionState &data, const float *const *inBlock, float *const *outBlock, size_t blockLen)
void	MakeTable (EffectDistortionState &state, const EffectDistortionSettings &ms)
void	HardClip (EffectDistortionState &, const EffectDistortionSettings &)
void	SoftClip (EffectDistortionState &, const EffectDistortionSettings &)
void	ExponentialTable (const EffectDistortionSettings &)
void	LogarithmicTable (const EffectDistortionSettings &)
void	HalfSinTable (const EffectDistortionSettings &)
void	CubicTable (const EffectDistortionSettings &)
void	EvenHarmonicTable (const EffectDistortionSettings &)
void	SineTable (const EffectDistortionSettings &)
void	Leveller (const EffectDistortionSettings &)
void	Rectifier (const EffectDistortionSettings &)
void	HardLimiter (EffectDistortionState &state, const EffectDistortionSettings &)
void	CopyHalfTable ()
float	LogCurve (double threshold, float value, double ratio)
double	Cubic (const EffectDistortionSettings &, double x)
float	WaveShaper (float sample, EffectDistortionSettings &ms)
float	DCFilter (EffectDistortionState &data, float sample)
unsigned	GetAudioInCount () const override
	How many input buffers to allocate at once. More...
unsigned	GetAudioOutCount () const override
	How many output buffers to allocate at once. More...
Public Member Functions inherited from PerTrackEffect::Instance
	Instance (const PerTrackEffect &processor)
	~Instance () override
bool	Process (EffectSettings &settings) final
	Uses the other virtual functions of this class. More...
bool	ProcessInitialize (EffectSettings &settings, double sampleRate, ChannelNames chanMap) override
bool	ProcessFinalize () noexcept override
Public Member Functions inherited from EffectInstanceEx
virtual bool	Init ()
	Call once to set up state for whole list of tracks to be processed. More...
virtual bool	Process (EffectSettings &settings)=0
	Actually do the effect here. More...
	~EffectInstanceEx () override
Public Member Functions inherited from EffectInstance
virtual	~EffectInstance ()
virtual size_t	GetBlockSize () const =0
virtual size_t	SetBlockSize (size_t maxBlockSize)=0
virtual unsigned	GetAudioInCount () const =0
	How many input buffers to allocate at once. More...
virtual unsigned	GetAudioOutCount () const =0
	How many output buffers to allocate at once. More...
virtual bool	RealtimeInitialize (EffectSettings &settings, double sampleRate)
virtual bool	RealtimeAddProcessor (EffectSettings &settings, EffectOutputs *pOutputs, unsigned numChannels, float sampleRate)
virtual bool	RealtimeSuspend ()
virtual bool	RealtimeResume ()
virtual std::unique_ptr< Message >	MakeMessage () const
	Called on the main thread, in which the result may be cloned. More...
virtual bool	UsesMessages () const noexcept
virtual bool	RealtimeProcessStart (MessagePackage &package)
	settings are possibly changed, since last call, by an asynchronous dialog More...
virtual size_t	RealtimeProcess (size_t group, EffectSettings &settings, const float *const *inBuf, float *const *outBuf, size_t numSamples)
virtual bool	RealtimeProcessEnd (EffectSettings &settings) noexcept
	settings can be updated to let a dialog change appearance at idle More...
virtual bool	RealtimeFinalize (EffectSettings &settings) noexcept
virtual size_t	GetTailSize () const
virtual SampleCount	GetLatency (const EffectSettings &settings, double sampleRate) const
virtual bool	NeedsDither () const
virtual bool	ProcessInitialize (EffectSettings &settings, double sampleRate, ChannelNames chanMap)=0
virtual bool	ProcessFinalize () noexcept=0
virtual size_t	ProcessBlock (EffectSettings &settings, const float *const *inBlock, float *const *outBlock, size_t blockLen)=0
	Called for destructive effect computation. More...
Public Member Functions inherited from EffectInstanceWithBlockSize
	~EffectInstanceWithBlockSize () override
size_t	GetBlockSize () const override
size_t	SetBlockSize (size_t maxBlockSize) override

Public Attributes
double	mTable [TABLESIZE]
EffectDistortionState	mMaster
std::vector< EffectDistortionState >	mSlaves

Additional Inherited Members
Public Types inherited from EffectInstance
using	Message = EffectSettingsAccess::Message
using	SampleCount = uint64_t
Protected Attributes inherited from PerTrackEffect::Instance
const PerTrackEffect &	mProcessor
Protected Attributes inherited from EffectInstanceWithBlockSize
size_t	mBlockSize { 0 }

Detailed Description

Definition at line 234 of file Distortion.cpp.

Constructor & Destructor Documentation

Instance()

EffectDistortion::Instance::Instance ( const PerTrackEffect &  effect )

inlineexplicit

Definition at line 238 of file Distortion.cpp.

      : PerTrackEffect::Instance{ effect }
   {}

Member Function Documentation

CopyHalfTable()

void EffectDistortion::Instance::CopyHalfTable

(

)

Definition at line 1490 of file Distortion.cpp.

{
   // Copy negative half of table from positive half
   int count = TABLESIZE - 1;
   for (int n = 0; n < STEPS; n++) {
      mTable[n] = -mTable[count];
      count--;
   }
}

References STEPS, and TABLESIZE.

Cubic()

double EffectDistortion::Instance::Cubic ( const EffectDistortionSettings &  ms, double  x  )

inline

Definition at line 1359 of file Distortion.cpp.

{
   if (ms.mParam1 == 0.0)
      return x;
 
   return x - (std::pow(x, 3.0) / 3.0);
}

References EffectDistortionSettings::mParam1.

CubicTable()

void EffectDistortion::Instance::CubicTable

(

const EffectDistortionSettings &

ms

)

Definition at line 1333 of file Distortion.cpp.

{
   double amount = ms.mParam1 * std::sqrt(3.0) / 100.0;
   double gain = 1.0;
   if (amount != 0.0)
      gain = 1.0 / Cubic(ms, std::min(amount, 1.0));
 
   double stepsize = amount / STEPS;
   double x = -amount;
   
   if (amount == 0) {
      for (int i = 0; i < TABLESIZE; i++) {
         mTable[i] = (i / (double)STEPS) - 1.0;
      }
   }
   else {
      for (int i = 0; i < TABLESIZE; i++) {
         mTable[i] = gain * Cubic(ms, x);
         for (int j = 0; j < ms.mRepeats; j++) {
            mTable[i] = gain * Cubic(ms, mTable[i] * amount);
         }
         x += stepsize;
      }
   }
}

References min(), EffectDistortionSettings::mParam1, EffectDistortionSettings::mRepeats, STEPS, and TABLESIZE.

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DCFilter()

float EffectDistortion::Instance::DCFilter	(	EffectDistortionState &	data,
		float	sample
	)

Definition at line 1531 of file Distortion.cpp.

{
   // Rolling average gives less offset at the start than an IIR filter.
   const unsigned int queueLength = std::floor(data.samplerate / 20.0);
 
   data.queuetotal += sample;
   data.queuesamples.push(sample);
 
   if (data.queuesamples.size() > queueLength) {
      data.queuetotal -= data.queuesamples.front();
      data.queuesamples.pop();
   }
 
   return sample - (data.queuetotal / data.queuesamples.size());
}

References EffectDistortionState::queuesamples, EffectDistortionState::queuetotal, and EffectDistortionState::samplerate.

EvenHarmonicTable()

void EffectDistortion::Instance::EvenHarmonicTable

(

const EffectDistortionSettings &

ms

)

Definition at line 1368 of file Distortion.cpp.

{
   double amount = ms.mParam1 / -100.0;
   // double C = std::sin(std::max(0.001, mParams.mParam2) / 100.0) * 10.0;
   double C = std::max(0.001, ms.mParam2) / 10.0;
 
   double step = 1.0 / STEPS;
   double xval = -1.0;
 
   for (int i = 0; i < TABLESIZE; i++) {
      mTable[i] = ((1 + amount) * xval) -
                  (xval * (amount / std::tanh(C)) * std::tanh(C * xval));
      xval += step;
   }
}

References EffectDistortionSettings::mParam1, EffectDistortionSettings::mParam2, STEPS, and TABLESIZE.

ExponentialTable()

void EffectDistortion::Instance::ExponentialTable

(

const EffectDistortionSettings &

ms

)

Definition at line 1281 of file Distortion.cpp.

{
   double amount = std::min(0.999, DB_TO_LINEAR(-1 * ms.mParam1));   // avoid divide by zero
 
   for (int n = STEPS; n < TABLESIZE; n++) {
      double linVal = n/(float)STEPS;
      double scale = -1.0 / (1.0 - amount);   // unity gain at 0dB
      double curve = std::exp((linVal - 1) * std::log(amount));
      mTable[n] = scale * (curve -1);
   }
   CopyHalfTable();
}

References DB_TO_LINEAR, min(), EffectDistortionSettings::mParam1, STEPS, and TABLESIZE.

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GetAudioInCount()

unsigned EffectDistortion::Instance::GetAudioInCount ( ) const

overridevirtual

How many input buffers to allocate at once.

If the instance processes channels independently, this can return 1 The result is not necessarily well defined before RealtimeInitialize

Implements EffectInstance.

Definition at line 361 of file Distortion.cpp.

{
   return 1;
}

GetAudioOutCount()

unsigned EffectDistortion::Instance::GetAudioOutCount ( ) const

overridevirtual

How many output buffers to allocate at once.

The result is not necessarily well defined before RealtimeInitialize

Implements EffectInstance.

Definition at line 366 of file Distortion.cpp.

{
   return 1;
}

HalfSinTable()

void EffectDistortion::Instance::HalfSinTable

(

const EffectDistortionSettings &

ms

)

Definition at line 1315 of file Distortion.cpp.

{
   int iter = std::floor(ms.mParam1 / 20.0);
   double fractionalpart = (ms.mParam1 / 20.0) - iter;
   double stepsize = 1.0 / STEPS;
   double linVal = 0;
 
   for (int n = STEPS; n < TABLESIZE; n++) {
      mTable[n] = linVal;
      for (int i = 0; i < iter; i++) {
         mTable[n] = std::sin(mTable[n] * M_PI_2);
      }
      mTable[n] += ((std::sin(mTable[n] * M_PI_2) - mTable[n]) * fractionalpart);
      linVal += stepsize;
   }
   CopyHalfTable();
}

References M_PI_2, EffectDistortionSettings::mParam1, STEPS, and TABLESIZE.

HardClip()

void EffectDistortion::Instance::HardClip	(	EffectDistortionState &	state,
		const EffectDistortionSettings &	ms
	)

Definition at line 1230 of file Distortion.cpp.

{
   const double threshold = DB_TO_LINEAR(ms.mThreshold_dB);
 
   double lowThresh  = 1 - threshold;
   double highThresh = 1 + threshold;
 
   for (int n = 0; n < TABLESIZE; n++) {
      if (n < (STEPS * lowThresh))
         mTable[n] = - threshold;
      else if (n > (STEPS * highThresh))
         mTable[n] = threshold;
      else
         mTable[n] = n/(double)STEPS - 1;
 
      state.mMakeupGain = 1.0 / threshold;
   }
}

References DB_TO_LINEAR, EffectDistortionState::mMakeupGain, EffectDistortionSettings::mThreshold_dB, STEPS, and TABLESIZE.

HardLimiter()

void EffectDistortion::Instance::HardLimiter	(	EffectDistortionState &	state,
		const EffectDistortionSettings &	settings
	)

Definition at line 1479 of file Distortion.cpp.

{
   // The LADSPA "hardLimiter 1413" is basically hard clipping,
   // but with a 'kind of' wet/dry mix:
   // out = ((wet-residual)*clipped) + (residual*in)
   HardClip(state, settings);
}

References settings().

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InstanceInit()

void EffectDistortion::Instance::InstanceInit	(	EffectDistortionState &	data,
		EffectSettings &	settings,
		float	sampleRate
	)

Definition at line 655 of file Distortion.cpp.

{
   auto& ms = GetSettings(settings);
  
   data.samplerate = sampleRate;
   data.skipcount = 0;
   data.tablechoiceindx = ms.mTableChoiceIndx;
   data.dcblock         = ms.mDCBlock;
   data.threshold       = ms.mThreshold_dB;
   data.noisefloor      = ms.mNoiseFloor;
   data.param1          = ms.mParam1;
   data.param2          = ms.mParam2;
   data.repeats         = ms.mRepeats;
 
   // DC block filter variables
   data.queuetotal = 0.0;
 
   //std::queue<float>().swap(data.queuesamples);
   while (!data.queuesamples.empty())
      data.queuesamples.pop();
 
   MakeTable(data, ms);
 
   return;
}

References EffectDistortionState::dcblock, EffectWithSettings< EffectDistortionSettings, StatelessPerTrackEffect >::GetSettings(), EffectDistortionState::noisefloor, EffectDistortionState::param1, EffectDistortionState::param2, EffectDistortionState::queuesamples, EffectDistortionState::queuetotal, EffectDistortionState::repeats, EffectDistortionState::samplerate, settings(), EffectDistortionState::skipcount, EffectDistortionState::tablechoiceindx, and EffectDistortionState::threshold.

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InstanceProcess()

size_t EffectDistortion::Instance::InstanceProcess	(	EffectSettings &	settings,
		EffectDistortionState &	data,
		const float *const *	inBlock,
		float *const *	outBlock,
		size_t	blockLen
	)

Definition at line 681 of file Distortion.cpp.

{
   auto& ms = GetSettings(settings);
   
   const float *ibuf = inBlock[0];
   float *obuf = outBlock[0];
 
   bool update = (ms.mTableChoiceIndx == data.tablechoiceindx &&
                  ms.mNoiseFloor == data.noisefloor &&
                  ms.mThreshold_dB == data.threshold &&
                  ms.mParam1 == data.param1 &&
                  ms.mParam2 == data.param2 &&
                  ms.mRepeats == data.repeats)? false : true;
 
   double p1 = ms.mParam1 / 100.0;
   double p2 = ms.mParam2 / 100.0;
 
   data.tablechoiceindx = ms.mTableChoiceIndx;
   data.threshold = ms.mThreshold_dB;
   data.noisefloor = ms.mNoiseFloor;
   data.param1 = ms.mParam1;
   data.repeats = ms.mRepeats;
 
   for (decltype(blockLen) i = 0; i < blockLen; i++) {
      if (update && ((data.skipcount++) % skipsamples == 0)) {
         MakeTable(data, ms);
      }
 
      switch (ms.mTableChoiceIndx)
      {
      case kHardClip:
         // Param2 = make-up gain.
         obuf[i] = WaveShaper(ibuf[i], ms) * ((1 - p2) + (data.mMakeupGain * p2));
         break;
      case kSoftClip:
         // Param2 = make-up gain.
         obuf[i] = WaveShaper(ibuf[i], ms) * ((1 - p2) + (data.mMakeupGain * p2));
         break;
      case kHalfSinCurve:
         obuf[i] = WaveShaper(ibuf[i], ms) * p2;
         break;
      case kExpCurve:
         obuf[i] = WaveShaper(ibuf[i], ms) * p2;
         break;
      case kLogCurve:
         obuf[i] = WaveShaper(ibuf[i], ms) * p2;
         break;
      case kCubic:
         obuf[i] = WaveShaper(ibuf[i], ms) * p2;
         break;
      case kEvenHarmonics:
         obuf[i] = WaveShaper(ibuf[i], ms);
         break;
      case kSinCurve:
         obuf[i] = WaveShaper(ibuf[i], ms) * p2;
         break;
      case kLeveller:
         obuf[i] = WaveShaper(ibuf[i], ms);
         break;
      case kRectifier:
         obuf[i] = WaveShaper(ibuf[i], ms);
         break;
      case kHardLimiter:
         // Mix equivalent to LADSPA effect's "Wet / Residual" mix
         obuf[i] = (WaveShaper(ibuf[i], ms) * (p1 - p2)) + (ibuf[i] * p2);
         break;
      default:
         obuf[i] = WaveShaper(ibuf[i], ms);
      }
      if (ms.mDCBlock) {
         obuf[i] = DCFilter(data, obuf[i]);
      }
   }
 
   return blockLen;
}

References EffectWithSettings< EffectDistortionSettings, StatelessPerTrackEffect >::GetSettings(), EffectDistortion::kCubic, EffectDistortion::kEvenHarmonics, EffectDistortion::kExpCurve, EffectDistortion::kHalfSinCurve, EffectDistortion::kHardClip, EffectDistortion::kHardLimiter, EffectDistortion::kLeveller, EffectDistortion::kLogCurve, EffectDistortion::kRectifier, EffectDistortion::kSinCurve, EffectDistortion::kSoftClip, EffectDistortionState::mMakeupGain, EffectDistortionState::noisefloor, EffectDistortionState::param1, EffectDistortionState::param2, EffectDistortionState::repeats, settings(), EffectDistortionState::skipcount, skipsamples, EffectDistortionState::tablechoiceindx, and EffectDistortionState::threshold.

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Leveller()

void EffectDistortion::Instance::Leveller

(

const EffectDistortionSettings &

ms

)

Definition at line 1402 of file Distortion.cpp.

{
   double noiseFloor = DB_TO_LINEAR(ms.mNoiseFloor);
   int numPasses = ms.mRepeats;
   double fractionalPass = ms.mParam1 / 100.0;
 
   const int numPoints = 6;
   const double gainFactors[numPoints] = { 0.80, 1.00, 1.20, 1.20, 1.00, 0.80 };
   double gainLimits[numPoints] = { 0.0001, 0.0, 0.1, 0.3, 0.5, 1.0 };
   double addOnValues[numPoints];
 
   gainLimits[1] = noiseFloor;
   /* In the original Leveller effect, behaviour was undefined for threshold > 20 dB.
    * If we want to support > 20 dB we need to scale the points to keep them non-decreasing.
    * 
    * if (noiseFloor > gainLimits[2]) {
    *    for (int i = 3; i < numPoints; i++) {
    *    gainLimits[i] = noiseFloor + ((1 - noiseFloor)*((gainLimits[i] - 0.1) / 0.9));
    * }
    * gainLimits[2] = noiseFloor;
    * }
    */
 
   // Calculate add-on values
   addOnValues[0] = 0.0;
   for (int i = 0; i < numPoints-1; i++) {
      addOnValues[i+1] = addOnValues[i] + (gainLimits[i] * (gainFactors[i] - gainFactors[1 + i]));
   }
 
   // Positive half of table.
   // The original effect increased the 'strength' of the effect by
   // repeated passes over the audio data.
   // Here we model that more efficiently by repeated passes over a linear table.
   for (int n = STEPS; n < TABLESIZE; n++) {
      mTable[n] = ((double) (n - STEPS) / (double) STEPS);
      for (int j = 0; j < numPasses; j++) {
         // Find the highest index for gain adjustment
         int index = numPoints - 1;
         for (int i = index; i >= 0 && mTable[n] < gainLimits[i]; i--) {
            index = i;
         }
         // the whole number of 'repeats'
         mTable[n] = (mTable[n] * gainFactors[index]) + addOnValues[index];
      }
      // Extrapolate for fine adjustment.
      // tiny fractions are not worth the processing time
      if (fractionalPass > 0.001) {
         int index = numPoints - 1;
         for (int i = index; i >= 0 && mTable[n] < gainLimits[i]; i--) {
            index = i;
         }
         mTable[n] += fractionalPass * ((mTable[n] * (gainFactors[index] - 1)) + addOnValues[index]);
      }
   }
   CopyHalfTable();
}

References DB_TO_LINEAR, EffectDistortionSettings::mNoiseFloor, EffectDistortionSettings::mParam1, EffectDistortionSettings::mRepeats, STEPS, and TABLESIZE.

LogarithmicTable()

void EffectDistortion::Instance::LogarithmicTable

(

const EffectDistortionSettings &

ms

)

Definition at line 1294 of file Distortion.cpp.

{
   double amount = ms.mParam1;
   double stepsize = 1.0 / STEPS;
   double linVal = 0;
 
   if (amount == 0){
      for (int n = STEPS; n < TABLESIZE; n++) {
      mTable[n] = linVal;
      linVal += stepsize;
      }
   }
   else {
      for (int n = STEPS; n < TABLESIZE; n++) {
         mTable[n] = std::log(1 + (amount * linVal)) / std::log(1 + amount);
         linVal += stepsize;
      }
   }
   CopyHalfTable();
}

References EffectDistortionSettings::mParam1, STEPS, and TABLESIZE.

LogCurve()

float EffectDistortion::Instance::LogCurve ( double  threshold, float  value, double  ratio  )

inline

Definition at line 1276 of file Distortion.cpp.

{
   return threshold + ((std::exp(ratio * (threshold - value)) - 1) / -ratio);
}

MakeTable()

void EffectDistortion::Instance::MakeTable	(	EffectDistortionState &	state,
		const EffectDistortionSettings &	ms
	)

Definition at line 1181 of file Distortion.cpp.

{
   switch (ms.mTableChoiceIndx)
   {
      case kHardClip:
         HardClip(state, ms);
         break;
      case kSoftClip:
         SoftClip(state, ms);
         break;
      case kHalfSinCurve:
         HalfSinTable(ms);
         break;
      case kExpCurve:
         ExponentialTable(ms);
         break;
      case kLogCurve:
         LogarithmicTable(ms);
         break;
      case kCubic:
         CubicTable(ms);
         break;
      case kEvenHarmonics:
         EvenHarmonicTable(ms);
         break;
      case kSinCurve:
         SineTable(ms);
         break;
      case kLeveller:
         Leveller(ms);
         break;
      case kRectifier:
         Rectifier(ms);
         break;
      case kHardLimiter:
         HardLimiter(state, ms);
         break;
   }
}

References EffectDistortion::kCubic, EffectDistortion::kEvenHarmonics, EffectDistortion::kExpCurve, EffectDistortion::kHalfSinCurve, EffectDistortion::kHardClip, EffectDistortion::kHardLimiter, EffectDistortion::kLeveller, EffectDistortion::kLogCurve, EffectDistortion::kRectifier, EffectDistortion::kSinCurve, EffectDistortion::kSoftClip, and EffectDistortionSettings::mTableChoiceIndx.

ProcessBlock()

size_t EffectDistortion::Instance::ProcessBlock ( EffectSettings &  settings, const float *const *  inBlock, float *const *  outBlock, size_t  blockLen  )

overridevirtual

Called for destructive effect computation.

Implements EffectInstance.

Definition at line 378 of file Distortion.cpp.

{
   return InstanceProcess(settings, mMaster, inBlock, outBlock, blockLen);
}

References settings().

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ProcessInitialize()

bool EffectDistortion::Instance::ProcessInitialize ( EffectSettings &  settings, double  sampleRate, ChannelNames  chanMap  )

overridevirtual

Called at start of destructive processing, for each (mono/stereo) track Default implementation does nothing, returns true

Parameters

chanMap

null or array terminated with ChannelNameEOL. Do not retain the pointer

Postcondition

GetAudioInCount() and GetAudioOutCount() are well defined

Implements EffectInstance.

Definition at line 371 of file Distortion.cpp.

{
   InstanceInit(mMaster, settings, sampleRate);
   return true;
}

References settings().

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RealtimeAddProcessor()

bool EffectDistortion::Instance::RealtimeAddProcessor ( EffectSettings &  settings, EffectOutputs *  pOutputs, unsigned  numChannels, float  sampleRate  )

overridevirtual

Returns

success Default implementation does nothing, returns true

Reimplemented from EffectInstance.

Definition at line 391 of file Distortion.cpp.

{
   EffectDistortionState slave;
 
   InstanceInit(slave, settings, sampleRate);
 
   mSlaves.push_back(slave);
 
   return true;
}

References settings().

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RealtimeFinalize()

bool EffectDistortion::Instance::RealtimeFinalize ( EffectSettings &  settings )

overridevirtualnoexcept

Returns

success Default implementation does nothing, returns true

Reimplemented from EffectInstance.

Definition at line 403 of file Distortion.cpp.

{
   mSlaves.clear();
 
   return true;
}

RealtimeInitialize()

bool EffectDistortion::Instance::RealtimeInitialize ( EffectSettings &  settings, double  sampleRate  )

overridevirtual

Returns

success

Postcondition

GetAudioInCount() and GetAudioOutCount() are well defined

Default implementation does nothing, returns false (so assume realtime is not supported). Other member functions related to realtime return true or zero, but will not be called, unless a derived class overrides RealtimeInitialize.

Reimplemented from EffectInstance.

Definition at line 384 of file Distortion.cpp.

{
   SetBlockSize(512);
   mSlaves.clear();
   return true;
}

RealtimeProcess()

size_t EffectDistortion::Instance::RealtimeProcess ( size_t  group, EffectSettings &  settings, const float *const *  inBuf, float *const *  outBuf, size_t  numSamples  )

overridevirtual

Returns

success Default implementation does nothing, returns 0

Reimplemented from EffectInstance.

Definition at line 410 of file Distortion.cpp.

{
   if (group >= mSlaves.size())
      return 0;
   return InstanceProcess(settings, mSlaves[group], inbuf, outbuf, numSamples);
}

References settings().

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Rectifier()

void EffectDistortion::Instance::Rectifier

(

const EffectDistortionSettings &

ms

)

Definition at line 1459 of file Distortion.cpp.

{
   double amount = (ms.mParam1 / 50.0) - 1;
   double stepsize = 1.0 / STEPS;
   int index = STEPS;
 
   // positive half of waveform is passed unaltered.
   for  (int n = 0; n <= STEPS; n++) {
      mTable[index] = n * stepsize;
      index += 1;
   }
 
   // negative half of table
   index = STEPS - 1;
   for (int n = 1; n <= STEPS; n++) {
      mTable[index] = n * stepsize * amount;
      index--;
   }
}

References EffectDistortionSettings::mParam1, and STEPS.

SineTable()

void EffectDistortion::Instance::SineTable

(

const EffectDistortionSettings &

ms

)

Definition at line 1384 of file Distortion.cpp.

{
   int iter = std::floor(ms.mParam1 / 20.0);
   double fractionalpart = (ms.mParam1 / 20.0) - iter;
   double stepsize = 1.0 / STEPS;
   double linVal = 0.0;
 
   for (int n = STEPS; n < TABLESIZE; n++) {
      mTable[n] = linVal;
      for (int i = 0; i < iter; i++) {
         mTable[n] = (1.0 + std::sin((mTable[n] * M_PI) - M_PI_2)) / 2.0;
      }
      mTable[n] += (((1.0 + std::sin((mTable[n] * M_PI) - M_PI_2)) / 2.0) - mTable[n]) * fractionalpart;
      linVal += stepsize;
   }
   CopyHalfTable();
}

References M_PI, M_PI_2, EffectDistortionSettings::mParam1, STEPS, and TABLESIZE.

SoftClip()

void EffectDistortion::Instance::SoftClip	(	EffectDistortionState &	state,
		const EffectDistortionSettings &	ms
	)

Definition at line 1253 of file Distortion.cpp.

{
   const double thresholdLinear = DB_TO_LINEAR(ms.mThreshold_dB);
 
   double threshold = 1 + thresholdLinear;
   double amount = std::pow(2.0, 7.0 * ms.mParam1 / 100.0); // range 1 to 128
   double peak = LogCurve(thresholdLinear, 1.0, amount);
   state.mMakeupGain = 1.0 / peak;
   mTable[STEPS] = 0.0;   // origin
 
   // positive half of table
   for (int n = STEPS; n < TABLESIZE; n++) {
      if (n < (STEPS * threshold)) // origin to threshold
         mTable[n] = n/(float)STEPS - 1;
      else
         mTable[n] = LogCurve(thresholdLinear, n/(double)STEPS - 1, amount);
   }
   CopyHalfTable();
}

References DB_TO_LINEAR, EffectDistortionState::mMakeupGain, EffectDistortionSettings::mParam1, EffectDistortionSettings::mThreshold_dB, STEPS, and TABLESIZE.

WaveShaper()

float EffectDistortion::Instance::WaveShaper	(	float	sample,
		EffectDistortionSettings &	ms
	)

Definition at line 1501 of file Distortion.cpp.

{
   float out;
   int index;
   double xOffset;
   double amount = 1;
 
   switch (ms.mTableChoiceIndx)
   {
      // Do any pre-processing here
      case kHardClip:
         // Pre-gain
         amount = ms.mParam1 / 100.0;
         sample *= 1+amount;
         break;
      default: break;
   }
 
   index = std::floor(sample * STEPS) + STEPS;
   index = wxMax<int>(wxMin<int>(index, 2 * STEPS - 1), 0);
   xOffset = ((1 + sample) * STEPS) - index;
   xOffset = wxMin<double>(wxMax<double>(xOffset, 0.0), 1.0);   // Clip at 0dB
 
   // linear interpolation: y = y0 + (y1-y0)*(x-x0)
   out = mTable[index] + (mTable[index + 1] - mTable[index]) * xOffset;
 
   return out;
}

References EffectDistortion::kHardClip, EffectDistortionSettings::mParam1, EffectDistortionSettings::mTableChoiceIndx, and STEPS.

Member Data Documentation

mMaster

EffectDistortionState EffectDistortion::Instance::mMaster

Definition at line 304 of file Distortion.cpp.

mSlaves

std::vector<EffectDistortionState> EffectDistortion::Instance::mSlaves

Definition at line 305 of file Distortion.cpp.

mTable

double EffectDistortion::Instance::mTable[TABLESIZE]

Definition at line 302 of file Distortion.cpp.

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The documentation for this struct was generated from the following file:

• Distortion.cpp