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Audacity 3.2.0
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A two-pass effect to reduce background noise. More...
#include <NoiseReduction.h>
Classes | |
class | Dialog |
Dialog used with EffectNoiseReduction. More... | |
class | Settings |
class | Statistics |
class | Worker |
Public Member Functions | |
EffectNoiseReduction () | |
virtual | ~EffectNoiseReduction () |
ComponentInterfaceSymbol | GetSymbol () const override |
TranslatableString | GetDescription () const override |
EffectType | GetType () const override |
Type determines how it behaves. More... | |
int | ShowHostInterface (EffectBase &plugin, wxWindow &parent, const EffectDialogFactory &factory, std::shared_ptr< EffectInstance > &pInstance, EffectSettingsAccess &access, bool forceModal=false) override |
bool | Process (EffectInstance &instance, EffectSettings &settings) override |
bool | TrackProgress (int whichTrack, double frac, const TranslatableString &={}) const |
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~StatefulEffect () override | |
std::shared_ptr< EffectInstance > | MakeInstance () const override |
Make an object maintaining short-term state of an Effect. More... | |
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virtual bool | Init () |
virtual bool | Process (EffectInstance &instance, EffectSettings &settings)=0 |
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 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 | SetBlockSize (size_t maxBlockSize) |
virtual size_t | GetBlockSize () const |
virtual unsigned | GetAudioInCount () const |
How many input buffers to allocate at once. More... | |
virtual unsigned | GetAudioOutCount () const |
How many output buffers to allocate at once. More... | |
virtual sampleCount | GetLatency () const |
virtual bool | NeedsDither () const |
virtual bool | ProcessInitialize (EffectSettings &settings, double sampleRate, ChannelNames chanMap=nullptr) |
virtual bool | ProcessFinalize () noexcept |
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Effect () | |
virtual | ~Effect () |
PluginPath | GetPath () const override |
bool | VisitSettings (SettingsVisitor &visitor, EffectSettings &settings) override |
bool | VisitSettings (ConstSettingsVisitor &visitor, const EffectSettings &settings) const override |
ComponentInterfaceSymbol | GetSymbol () const override |
VendorSymbol | GetVendor () const override |
wxString | GetVersion () const override |
TranslatableString | GetDescription () const override |
EffectType | GetType () const override |
Type determines how it behaves. More... | |
EffectFamilySymbol | GetFamily () const override |
Report identifier and user-visible name of the effect protocol. More... | |
bool | IsInteractive () const override |
Whether the effect needs a dialog for entry of settings. More... | |
bool | IsDefault () const override |
Whether the effect sorts "above the line" in the menus. More... | |
RealtimeSince | RealtimeSupport () const override |
Since which version of Audacity has the effect supported realtime? More... | |
bool | SupportsAutomation () const override |
Whether the effect has any automatable controls. More... | |
bool | SaveSettings (const EffectSettings &settings, CommandParameters &parms) const override |
Store settings as keys and values. More... | |
bool | LoadSettings (const CommandParameters &parms, EffectSettings &settings) const override |
Restore settings from keys and values. More... | |
OptionalMessage | LoadUserPreset (const RegistryPath &name, EffectSettings &settings) const override |
bool | SaveUserPreset (const RegistryPath &name, const EffectSettings &settings) const override |
Save settings in the configuration file as a user-named preset. More... | |
RegistryPaths | GetFactoryPresets () const override |
Report names of factory presets. More... | |
OptionalMessage | LoadFactoryPreset (int id, EffectSettings &settings) const override |
OptionalMessage | LoadFactoryDefaults (EffectSettings &settings) const override |
virtual const EffectParameterMethods & | Parameters () const |
bool | CanExportPresets () const override |
Whether the effect supports export of presets to files, and importing too. More... | |
bool | HasOptions () const override |
const EffectSettingsManager & | GetDefinition () const override |
virtual NumericFormatSymbol | GetSelectionFormat () |
bool | SaveSettingsAsString (const EffectSettings &settings, wxString &parms) const override |
OptionalMessage | LoadSettingsFromString (const wxString &parms, EffectSettings &settings) const override |
bool | IsBatchProcessing () const override |
void | SetBatchProcessing () override |
void | UnsetBatchProcessing () override |
unsigned | TestUIFlags (unsigned mask) |
bool | Delegate (Effect &delegate, EffectSettings &settings, InstanceFinder finder={}) |
Re-invoke DoEffect on another Effect object that implements the work. More... | |
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EffectBase () | |
~EffectBase () override | |
bool | IsLinearEffect () const |
bool | PreviewsFullSelection () const |
void | SetTracks (TrackList *pTracks) |
virtual std::any | BeginPreview (const EffectSettings &settings) |
Called when Preview() starts, to allow temporary effect state changes. More... | |
bool | DoEffect (EffectSettings &settings, const InstanceFinder &finder, double projectRate, TrackList *list, WaveTrackFactory *factory, NotifyingSelectedRegion &selectedRegion, unsigned flags, const EffectSettingsAccessPtr &pAccess) override |
virtual double | CalcPreviewInputLength (const EffectSettings &settings, double previewLength) const =0 |
void | CountWaveTracks () |
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EffectPlugin & | operator= (EffectPlugin &)=delete |
virtual | ~EffectPlugin () |
virtual bool | HasOptions () const =0 |
virtual bool | CanExportPresets () const =0 |
Whether the effect supports export of presets to files, and importing too. More... | |
virtual const EffectSettingsManager & | GetDefinition () const =0 |
virtual bool | SaveSettingsAsString (const EffectSettings &settings, wxString &parms) const =0 |
virtual OptionalMessage | LoadSettingsFromString (const wxString &parms, EffectSettings &settings) const =0 |
virtual bool | IsBatchProcessing () const =0 |
virtual void | SetBatchProcessing ()=0 |
virtual void | UnsetBatchProcessing ()=0 |
virtual bool | DoEffect (EffectSettings &settings, const InstanceFinder &finder, double projectRate, TrackList *list, WaveTrackFactory *factory, NotifyingSelectedRegion &selectedRegion, unsigned flags, const EffectSettingsAccessPtr &pAccess=nullptr)=0 |
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virtual | ~EffectInstanceFactory () |
virtual std::shared_ptr< EffectInstance > | MakeInstance () const =0 |
Make an object maintaining short-term state of an Effect. More... | |
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virtual | ~EffectSettingsManager () |
virtual bool | VisitSettings (SettingsVisitor &visitor, EffectSettings &settings) |
virtual bool | VisitSettings (ConstSettingsVisitor &visitor, const EffectSettings &settings) const |
virtual EffectSettings | MakeSettings () const |
virtual bool | CopySettingsContents (const EffectSettings &src, EffectSettings &dst) const |
Update one settings object from another. More... | |
virtual std::unique_ptr< EffectOutputs > | MakeOutputs () const |
Produce an object to hold values to send to effect output meters. More... | |
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virtual | ~EffectDefinitionInterface () |
virtual EffectType | GetType () const =0 |
Type determines how it behaves. More... | |
virtual EffectType | GetClassification () const |
Determines which menu it appears in; default same as GetType(). More... | |
virtual EffectFamilySymbol | GetFamily () const =0 |
Report identifier and user-visible name of the effect protocol. More... | |
virtual bool | IsInteractive () const =0 |
Whether the effect needs a dialog for entry of settings. More... | |
virtual bool | IsDefault () const =0 |
Whether the effect sorts "above the line" in the menus. More... | |
virtual RealtimeSince | RealtimeSupport () const =0 |
Since which version of Audacity has the effect supported realtime? More... | |
bool | SupportsRealtime () const |
virtual bool | SupportsAutomation () const =0 |
Whether the effect has any automatable controls. More... | |
virtual bool | EnablesDebug () const |
Whether the effect dialog should have a Debug button; default, always false. More... | |
virtual ManualPageID | ManualPage () const |
Name of a page in the Audacity alpha manual, default is empty. More... | |
virtual FilePath | HelpPage () const |
Fully qualified local help file name, default is empty. More... | |
virtual bool | IsHiddenFromMenus () const |
Default is false. More... | |
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virtual | ~ComponentInterface () |
virtual PluginPath | GetPath () const =0 |
virtual ComponentInterfaceSymbol | GetSymbol () const =0 |
virtual VendorSymbol | GetVendor () const =0 |
virtual wxString | GetVersion () const =0 |
virtual TranslatableString | GetDescription () const =0 |
TranslatableString | GetName () const |
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~StatefulEffectUIServices () override | |
std::unique_ptr< EffectEditor > | PopulateUI (const EffectPlugin &plugin, ShuttleGui &S, EffectInstance &instance, EffectSettingsAccess &access, const EffectOutputs *pOutputs) const override |
Allows PopulateOrExchange to return null. More... | |
virtual std::unique_ptr< EffectEditor > | PopulateOrExchange (ShuttleGui &S, EffectInstance &instance, EffectSettingsAccess &access, const EffectOutputs *pOutputs) |
Add controls to effect panel; always succeeds. More... | |
virtual bool | TransferDataToWindow (const EffectSettings &settings) |
virtual bool | TransferDataFromWindow (EffectSettings &settings) |
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int | ShowClientInterface (const EffectPlugin &plugin, wxWindow &parent, wxDialog &dialog, EffectEditor *pEditor, bool forceModal) const override |
void | ExportPresets (const EffectPlugin &plugin, const EffectSettings &settings) const override |
OptionalMessage | ImportPresets (const EffectPlugin &plugin, EffectSettings &settings) const override |
void | ShowOptions (const EffectPlugin &plugin) const override |
bool | ValidateUI (const EffectPlugin &context, EffectSettings &) const override |
bool | CloseUI () const override |
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virtual | ~EffectUIServices () |
virtual int | ShowHostInterface (EffectBase &plugin, wxWindow &parent, const EffectDialogFactory &factory, std::shared_ptr< EffectInstance > &pInstance, EffectSettingsAccess &access, bool forceModal=false) |
virtual int | ShowClientInterface (const EffectPlugin &plugin, wxWindow &parent, wxDialog &dialog, EffectEditor *pEditor, bool forceModal=false) const =0 |
virtual std::unique_ptr< EffectEditor > | PopulateUI (const EffectPlugin &plugin, ShuttleGui &S, EffectInstance &instance, EffectSettingsAccess &access, const EffectOutputs *pOutputs) const =0 |
Adds controls to a panel that is given as the parent window of S More... | |
virtual void | ExportPresets (const EffectPlugin &plugin, const EffectSettings &settings) const =0 |
virtual OptionalMessage | ImportPresets (const EffectPlugin &plugin, EffectSettings &settings) const =0 |
virtual void | ShowOptions (const EffectPlugin &plugin) const =0 |
virtual bool | ValidateUI (const EffectPlugin &context, EffectSettings &settings) const =0 |
virtual bool | CloseUI () const =0 |
Static Public Attributes | |
static const ComponentInterfaceSymbol | Symbol { XO("Noise Reduction") } |
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static const wxString | kUserPresetIdent = wxT("User Preset:") |
static const wxString | kFactoryPresetIdent = wxT("Factory Preset:") |
static const wxString | kCurrentSettingsIdent = wxT("<Current Settings>") |
static const wxString | kFactoryDefaultsIdent = wxT("<Factory Defaults>") |
Private Attributes | |
std::unique_ptr< Settings > | mSettings |
std::unique_ptr< Statistics > | mStatistics |
Friends | |
class | Dialog |
Additional Inherited Members | |
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using | MessagePackage = EffectInstance::MessagePackage |
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using | EffectSettingsAccessPtr = std::shared_ptr< EffectSettingsAccess > |
using | InstancePointer = std::shared_ptr< EffectInstanceEx > |
using | InstanceFinder = std::function< std::optional< InstancePointer >(EffectSettings &settings) > |
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enum class | RealtimeSince : unsigned { Never , After_3_1 , Always } |
In which versions of Audacity was an effect realtime capable? More... | |
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enum | : long { DefaultMessageBoxStyle = wxOK | wxCENTRE } |
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static Effect * | FetchParameters (Effect &e, EffectSettings &) |
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static std::optional< InstancePointer > | FindInstance (EffectPlugin &plugin) |
static InstanceFinder | DefaultInstanceFinder (EffectPlugin &plugin) |
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static Identifier | GetSquashedName (const Identifier &ident) |
A utility that strips spaces and CamelCases a name. More... | |
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static int | DoMessageBox (const EffectPlugin &plugin, const TranslatableString &message, long style=DefaultMessageBoxStyle, const TranslatableString &titleStr={}) |
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std::shared_ptr< TrackList > | mTracks {} |
int | mNumTracks {} |
BasicUI::ProgressDialog * | mProgress {} |
double | mProjectRate {} |
WaveTrackFactory * | mFactory {} |
double | mT0 {} |
double | mT1 {} |
bool | mIsPreview { false } |
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bool | CheckWhetherSkipEffect (const EffectSettings &settings) const override |
Default implementation returns false. More... | |
double | CalcPreviewInputLength (const EffectSettings &settings, double previewLength) const override |
Default implementation returns previewLength More... | |
bool | TotalProgress (double frac, const TranslatableString &={}) const |
bool | TrackProgress (int whichTrack, double frac, const TranslatableString &={}) const |
bool | TrackGroupProgress (int whichGroup, double frac, const TranslatableString &={}) const |
int | GetNumWaveTracks () const |
int | GetNumWaveGroups () const |
void | GetBounds (const WaveTrack &track, sampleCount *start, sampleCount *len) |
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virtual bool | CheckWhetherSkipEffect (const EffectSettings &settings) const =0 |
After Init(), tell whether Process() should be skipped. More... | |
void | SetLinearEffectFlag (bool linearEffectFlag) |
void | SetPreviewFullSelectionFlag (bool previewDurationFlag) |
bool | IsPreviewing () const |
const TrackList * | inputTracks () const |
const AudacityProject * | FindProject () const |
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wxArrayString | mPresetNames |
unsigned | mUIFlags { 0 } |
A two-pass effect to reduce background noise.
The first pass is done over just noise. For each windowed sample of the sound, we take a FFT and then statistics are tabulated for each frequency band.
During the noise reduction phase, we start by setting a gain control for each frequency band such that if the sound has exceeded the previously-determined threshold, the gain is set to 0 dB, otherwise the gain is set lower (e.g. -18 dB), to suppress the noise. Then time-smoothing is applied so that the gain for each frequency band moves slowly, and then frequency-smoothing is applied so that a single frequency is never suppressed or boosted in isolation. Lookahead is employed; this effect is not designed for real-time but if it were, there would be a significant delay.
The gain controls are applied to the complex FFT of the signal, and then the inverse FFT is applied. A Hann window may be applied (depending on the advanced window types setting), and then the output signal is then pieced together using overlap/add.
Definition at line 18 of file NoiseReduction.h.
EffectNoiseReduction::EffectNoiseReduction | ( | ) |
Definition at line 427 of file NoiseReduction.cpp.
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virtual |
Definition at line 432 of file NoiseReduction.cpp.
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overridevirtual |
Implements ComponentInterface.
Definition at line 443 of file NoiseReduction.cpp.
References XO().
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overridevirtual |
Implements ComponentInterface.
Definition at line 438 of file NoiseReduction.cpp.
References Symbol.
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overridevirtual |
Type determines how it behaves.
Implements EffectDefinitionInterface.
Definition at line 450 of file NoiseReduction.cpp.
References EffectTypeProcess.
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overridevirtual |
Implements StatefulEffectBase.
Definition at line 636 of file NoiseReduction.cpp.
References EffectUIServices::DoMessageBox(), eWinFuncBlackman, eWinFuncHamming, eWinFuncHann, eWinFuncRectangular, mSettings, mStatistics, EffectBase::mT0, EffectBase::mT1, EffectBase::mTracks, anonymous_namespace{NoiseReduction.cpp}::WT_BLACKMAN_HANN, anonymous_namespace{NoiseReduction.cpp}::WT_HAMMING_HANN, anonymous_namespace{NoiseReduction.cpp}::WT_HAMMING_RECTANGULAR, anonymous_namespace{NoiseReduction.cpp}::WT_HANN_HANN, anonymous_namespace{NoiseReduction.cpp}::WT_HANN_RECTANGULAR, anonymous_namespace{NoiseReduction.cpp}::WT_RECTANGULAR_HANN, and XO().
Referenced by EffectNoiseReduction::Worker::Process().
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overridevirtual |
An override still here for historical reasons, ignoring the factory and the access
We would like to make this effect behave more like others, but it does have its unusual two-pass nature. First choose and analyze an example of noise, then apply noise reduction to another selection. That is difficult to fit into the framework for managing settings of other effects.
Reimplemented from EffectUIServices.
Definition at line 461 of file NoiseReduction.cpp.
References Effect::IsBatchProcessing(), StatefulEffect::MakeInstance(), mSettings, and mStatistics.
bool Effect::TrackProgress | ( | int | whichTrack, |
double | frac, | ||
const TranslatableString & | msg = {} |
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) | const |
Definition at line 131 of file Effect.cpp.
References Effect::Parameters(), EffectParameterMethods::Set(), and settings().
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friend |
Definition at line 53 of file NoiseReduction.h.
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private |
Definition at line 55 of file NoiseReduction.h.
Referenced by EffectNoiseReduction::Worker::ApplyFreqSmoothing(), EffectNoiseReduction::Worker::GatherStatistics(), Process(), EffectNoiseReduction::Worker::Process(), EffectNoiseReduction::Worker::ReduceNoise(), and ShowHostInterface().
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private |
Definition at line 56 of file NoiseReduction.h.
Referenced by EffectNoiseReduction::Worker::Classify(), EffectNoiseReduction::Worker::FinishTrackStatistics(), EffectNoiseReduction::Worker::GatherStatistics(), Process(), EffectNoiseReduction::Worker::Process(), and ShowHostInterface().
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static |
Definition at line 20 of file NoiseReduction.h.
Referenced by GetSymbol().