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/**********************************************************************
Audacity: A Digital Audio Editor
Noise.cpp
Dominic Mazzoni
*******************************************************************//**
\class EffectNoise
\brief An effect to add white noise.
*//*******************************************************************/
#include "../Audacity.h"
#include "Noise.h"
#include "LoadEffects.h"
#include <math.h>
#include <wx/choice.h>
#include <wx/intl.h>
#include <wx/textctrl.h>
#include <wx/valgen.h>
#include "../Prefs.h"
#include "../Shuttle.h"
#include "../ShuttleGui.h"
#include "../widgets/valnum.h"
#include "../widgets/NumericTextCtrl.h"
enum kTypes
{
kWhite,
kPink,
kBrownian,
nTypes
};
static const EnumValueSymbol kTypeStrings[nTypes] =
{
// These are acceptable dual purpose internal/visible names
/* i18n-hint: not a color, but "white noise" having a uniform spectrum */
{ XC("White", "noise") },
/* i18n-hint: not a color, but "pink noise" having a spectrum with more power
in low frequencies */
{ XC("Pink", "noise") },
/* i18n-hint: a kind of noise spectrum also known as "red" or "brown" */
{ XC("Brownian", "noise") }
};
// Define keys, defaults, minimums, and maximums for the effect parameters
//
// Name Type Key Def Min Max Scale
Param( Type, int, wxT("Type"), kWhite, 0, nTypes - 1, 1 );
Param( Amp, double, wxT("Amplitude"), 0.8, 0.0, 1.0, 1 );
//
// EffectNoise
//
const ComponentInterfaceSymbol EffectNoise::Symbol
{ XO("Noise") };
namespace{ BuiltinEffectsModule::Registration< EffectNoise > reg; }
EffectNoise::EffectNoise()
{
mType = DEF_Type;
mAmp = DEF_Amp;
SetLinearEffectFlag(true);
y = z = buf0 = buf1 = buf2 = buf3 = buf4 = buf5 = buf6 = 0;
}
EffectNoise::~EffectNoise()
{
}
// ComponentInterface implementation
ComponentInterfaceSymbol EffectNoise::GetSymbol()
{
return Symbol;
}
TranslatableString EffectNoise::GetDescription()
{
return XO("Generates one of three different types of noise");
}
wxString EffectNoise::ManualPage()
{
return wxT("Noise");
}
// EffectDefinitionInterface implementation
EffectType EffectNoise::GetType()
{
return EffectTypeGenerate;
}
// EffectClientInterface implementation
unsigned EffectNoise::GetAudioOutCount()
{
return 1;
}
size_t EffectNoise::ProcessBlock(float **WXUNUSED(inbuf), float **outbuf, size_t size)
{
float *buffer = outbuf[0];
float white;
float amplitude;
float div = ((float) RAND_MAX) / 2.0f;
switch (mType)
{
default:
case kWhite: // white
for (decltype(size) i = 0; i < size; i++)
{
buffer[i] = mAmp * ((rand() / div) - 1.0f);
}
break;
case kPink: // pink
// based on Paul Kellet's "instrumentation grade" algorithm.
// 0.129f is an experimental normalization factor.
amplitude = mAmp * 0.129f;
for (decltype(size) i = 0; i < size; i++)
{
white = (rand() / div) - 1.0f;
buf0 = 0.99886f * buf0 + 0.0555179f * white;
buf1 = 0.99332f * buf1 + 0.0750759f * white;
buf2 = 0.96900f * buf2 + 0.1538520f * white;
buf3 = 0.86650f * buf3 + 0.3104856f * white;
buf4 = 0.55000f * buf4 + 0.5329522f * white;
buf5 = -0.7616f * buf5 - 0.0168980f * white;
buffer[i] = amplitude *
(buf0 + buf1 + buf2 + buf3 + buf4 + buf5 + buf6 + white * 0.5362);
buf6 = white * 0.115926;
}
break;
case kBrownian: // Brownian
//float leakage=0.997; // experimental value at 44.1kHz
//double scaling = 0.05; // experimental value at 44.1kHz
// min and max protect against instability at extreme sample rates.
float leakage = ((mSampleRate - 144.0) / mSampleRate < 0.9999)
? (mSampleRate - 144.0) / mSampleRate
: 0.9999f;
float scaling = (9.0 / sqrt(mSampleRate) > 0.01)
? 9.0 / sqrt(mSampleRate)
: 0.01f;
for (decltype(size) i = 0; i < size; i++)
{
white = (rand() / div) - 1.0f;
z = leakage * y + white * scaling;
y = fabs(z) > 1.0
? leakage * y - white * scaling
: z;
buffer[i] = mAmp * y;
}
break;
}
return size;
}
bool EffectNoise::DefineParams( ShuttleParams & S ){
S.SHUTTLE_ENUM_PARAM( mType, Type, kTypeStrings, nTypes );
S.SHUTTLE_PARAM( mAmp, Amp );
return true;
}
bool EffectNoise::GetAutomationParameters(CommandParameters & parms)
{
parms.Write(KEY_Type, kTypeStrings[mType].Internal());
parms.Write(KEY_Amp, mAmp);
return true;
}
bool EffectNoise::SetAutomationParameters(CommandParameters & parms)
{
ReadAndVerifyEnum(Type, kTypeStrings, nTypes);
ReadAndVerifyDouble(Amp);
mType = Type;
mAmp = Amp;
return true;
}
// Effect implementation
bool EffectNoise::Startup()
{
wxString base = wxT("/Effects/Noise/");
// Migrate settings from 2.1.0 or before
// Already migrated, so bail
if (gPrefs->Exists(base + wxT("Migrated")))
{
return true;
}
// Load the old "current" settings
if (gPrefs->Exists(base))
{
gPrefs->Read(base + wxT("Type"), &mType, 0L);
gPrefs->Read(base + wxT("Amplitude"), &mAmp, 0.8f);
SaveUserPreset(GetCurrentSettingsGroup());
// Do not migrate again
gPrefs->Write(base + wxT("Migrated"), true);
gPrefs->Flush();
}
return true;
}
void EffectNoise::PopulateOrExchange(ShuttleGui & S)
{
wxASSERT(nTypes == WXSIZEOF(kTypeStrings));
S.StartMultiColumn(2, wxCENTER);
{
S.Validator<wxGenericValidator>(&mType)
.AddChoice(XXO("&Noise type:"), Msgids(kTypeStrings, nTypes));
S.Validator<FloatingPointValidator<double>>(
6, &mAmp, NumValidatorStyle::NO_TRAILING_ZEROES, MIN_Amp, MAX_Amp
)
.AddTextBox(XXO("&Amplitude (0-1):"), wxT(""), 12);
S.AddPrompt(XXO("&Duration:"));
mNoiseDurationT = safenew
NumericTextCtrl(S.GetParent(), wxID_ANY,
NumericConverter::TIME,
GetDurationFormat(),
GetDuration(),
mProjectRate,
NumericTextCtrl::Options{}
.AutoPos(true));
S.Name(XO("Duration"))
.Position(wxALIGN_LEFT | wxALIGN_CENTER_VERTICAL | wxALL)
.AddWindow(mNoiseDurationT);
}
S.EndMultiColumn();
}
bool EffectNoise::TransferDataToWindow()
{
if (!mUIParent->TransferDataToWindow())
{
return false;
}
mNoiseDurationT->SetValue(GetDuration());
return true;
}
bool EffectNoise::TransferDataFromWindow()
{
if (!mUIParent->Validate() || !mUIParent->TransferDataFromWindow())
{
return false;
}
SetDuration(mNoiseDurationT->GetValue());
return true;
}