FrequencyDetectorZeroCrossing Class Reference

Detects frequency using upward zero crossings in audio samples. More...

#include <FrequencyDetectorZeroCrossing.h>

Inheritance diagram for FrequencyDetectorZeroCrossing:

Classes
struct	ChannelState
	Holds state for each channel during zero crossing detection. More...

Public Member Functions
	FrequencyDetectorZeroCrossing ()=default
	Default constructor.
	FrequencyDetectorZeroCrossing (Print &out)
	Construct with output stream.
	FrequencyDetectorZeroCrossing (Stream &in)
	Construct with input stream.
virtual void	addNotifyAudioChange (AudioInfoSupport &bi)
	Adds target to be notified about audio changes.
virtual void	addNotifyAudioChange (AudioInfoSupport &bi)
	Adds target to be notified about audio changes.
virtual AudioInfo	audioInfo () override
	provides the actual input AudioInfo
virtual AudioInfo	audioInfo () override
	provides the actual input AudioInfo
virtual AudioInfo	audioInfoOut ()
virtual AudioInfo	audioInfoOut ()
int	available () override
	Returns the number of bytes available for reading.
int	availableForWrite () override
	Returns the number of bytes available for writing.
virtual bool	begin ()
bool	begin (AudioInfo info)
	Initialize with audio configuration.
virtual void	clearNotifyAudioChange ()
	Deletes all change notify subscriptions.
virtual void	clearNotifyAudioChange ()
	Deletes all change notify subscriptions.
virtual void	end ()
virtual void	end ()
virtual void	flush () override
virtual void	flush () override
float	frequency (int channel)
	Returns the last detected frequency for the given channel.
bool	isNotifyActive ()
	Checks if the automatic AudioInfo update is active.
bool	isNotifyActive ()
	Checks if the automatic AudioInfo update is active.
virtual	operator bool ()
virtual	operator bool ()
size_t	readBytes (uint8_t *data, size_t len) override
	Reads bytes from the input stream and processes them for frequency detection.
virtual size_t	readSilence (uint8_t *buffer, size_t length)
	Source to generate silence: just sets the buffer to 0.
virtual size_t	readSilence (uint8_t *buffer, size_t length)
	Source to generate silence: just sets the buffer to 0.
virtual bool	removeNotifyAudioChange (AudioInfoSupport &bi)
	Removes a target in order not to be notified about audio changes.
virtual bool	removeNotifyAudioChange (AudioInfoSupport &bi)
	Removes a target in order not to be notified about audio changes.
virtual void	setAudioInfo (AudioInfo newInfo) override
	Defines the input AudioInfo.
virtual void	setAudioInfo (AudioInfo newInfo) override
	Defines the input AudioInfo.
void	setFrequencyCallback (void(*callback)(int channel, float freq))
	Sets a callback function to be called when a new frequency is detected.
void	setNotifyActive (bool flag)
	Deactivate/Reactivate automatic AudioInfo updates: (default is active).
void	setNotifyActive (bool flag)
	Deactivate/Reactivate automatic AudioInfo updates: (default is active).
void	setWriteBufferSize (int size)
void	setWriteBufferSize (int size)
virtual size_t	write (uint8_t ch) override
virtual size_t	write (const uint8_t *data, size_t len) override
	Writes bytes to the output stream and processes them for frequency detection.
virtual void	writeSilence (size_t len)
	Writes len bytes of silence (=0).
virtual void	writeSilence (size_t len)
	Writes len bytes of silence (=0).

Protected Member Functions
template<class T>
void	detect (T *samples, size_t len)
	Detects frequency for all channels using zero crossing method.
template<class T>
void	detectChannel (int channel, T *samples, size_t len)
	Detects frequency for a single channel by counting upward zero crossings.
virtual int	not_supported (int out, const char *msg="")
virtual int	not_supported (int out, const char *msg="")
void	notifyAudioChange (AudioInfo info)
void	notifyAudioChange (AudioInfo info)
void	refillReadBuffer ()
	Refill small read buffer (e.g. 8 bytes) to avoid single byte reads when calling read().
void	refillReadBuffer ()
	Refill small read buffer (e.g. 8 bytes) to avoid single byte reads when calling read().

Protected Attributes
int	_timeout = 10
bool	active = false
	Counting active flag (unused, kept for compatibility).
int	count = 0
	Sample count (unused, kept for compatibility).
void(*	freq_callback )(int channel, float freq)
	Frequency callback function.
AudioInfo	info
bool	is_notify_active = true
Vector< AudioInfoSupport * >	notify_vector
Stream *	p_in = nullptr
	Input stream pointer.
Print *	p_out = nullptr
	Output stream pointer.
Vector< ChannelState >	states
	State for each channel.
RingBuffer< uint8_t >	tmp_in {0}
RingBuffer< uint8_t >	tmp_out {0}
int	write_buffer_size = 8

Detailed Description

Detects frequency using upward zero crossings in audio samples.

This class estimates the frequency by counting the number of samples between upward zero crossings (negative to positive transitions). It supports multiple channels and different sample formats.

Usage:

• Feed audio data via write() or readBytes().
• Call frequency(channel) to get the detected frequency for a channel.
• Optionally, set a callback to be notified when a new frequency is detected.

Constructor & Destructor Documentation

FrequencyDetectorZeroCrossing() [1/3]

FrequencyDetectorZeroCrossing ( )

default

Default constructor.

FrequencyDetectorZeroCrossing() [2/3]

FrequencyDetectorZeroCrossing ( Print & out )

inline

Construct with output stream.

Parameters

out	Output stream for writing audio data.

FrequencyDetectorZeroCrossing() [3/3]

FrequencyDetectorZeroCrossing ( Stream & in )

inline

Construct with input stream.

Parameters

in	Input stream for reading audio data.

Member Function Documentation

addNotifyAudioChange() [1/2]

virtual void addNotifyAudioChange ( AudioInfoSupport & bi )

inlinevirtualinherited

Adds target to be notified about audio changes.

Reimplemented in CodecNOP, CodecNOP, EncodedAudioOutput, and EncodedAudioStream.

addNotifyAudioChange() [2/2]

virtual void addNotifyAudioChange ( AudioInfoSupport & bi )

inlinevirtualinherited

Adds target to be notified about audio changes.

Reimplemented in CodecNOP, CodecNOP, EncodedAudioOutput, and EncodedAudioStream.

audioInfo() [1/2]

virtual AudioInfo audioInfo ( )

inlineoverridevirtualinherited

provides the actual input AudioInfo

Implements AudioInfoSupport.

Reimplemented in AdapterAudioOutputToAudioStream, AdapterAudioOutputToAudioStream, EncodedAudioStream, GeneratedSoundStream< T >, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, InputMerge< T >, InputMerge< T >, TimerCallbackAudioStream, TimerCallbackAudioStream, EncodedAudioStream, GeneratedSoundStream< T >, InputMerge< T >, JupyterAudioT< T >, JupyterAudioT< int16_t >, MozziStream, PureDataStream, and TimerCallbackAudioStream.

audioInfo() [2/2]

virtual AudioInfo audioInfo ( )

inlineoverridevirtualinherited

provides the actual input AudioInfo

Implements AudioInfoSupport.

Reimplemented in AdapterAudioOutputToAudioStream, AdapterAudioOutputToAudioStream, EncodedAudioStream, GeneratedSoundStream< T >, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, InputMerge< T >, InputMerge< T >, TimerCallbackAudioStream, TimerCallbackAudioStream, EncodedAudioStream, GeneratedSoundStream< T >, InputMerge< T >, JupyterAudioT< T >, JupyterAudioT< int16_t >, MozziStream, PureDataStream, and TimerCallbackAudioStream.

audioInfoOut() [1/2]

virtual AudioInfo audioInfoOut ( )

inlinevirtualinherited

provides the actual output AudioInfo: this is usually the same as audioInfo() unless we use a transforming stream

Reimplemented in ChannelFormatConverterStream, ChannelFormatConverterStreamT< T >, FormatConverterStream, MP3EncoderShine, NumberFormatConverterStream, NumberFormatConverterStreamT< TFrom, TTo >, Pipeline, PureDataStream, PWMAudioOutput< PWMDriverT >, ResampleStream, ResampleStreamT< TInterpolator >, and SupportedRatesStream.

audioInfoOut() [2/2]

virtual AudioInfo audioInfoOut ( )

inlinevirtualinherited

provides the actual output AudioInfo: this is usually the same as audioInfo() unless we use a transforming stream

Reimplemented in ChannelFormatConverterStream, ChannelFormatConverterStreamT< T >, FormatConverterStream, MP3EncoderShine, NumberFormatConverterStream, NumberFormatConverterStreamT< TFrom, TTo >, Pipeline, PureDataStream, PWMAudioOutput< PWMDriverT >, ResampleStream, ResampleStreamT< TInterpolator >, and SupportedRatesStream.

available()

int available ( )

inlineoverridevirtual

Returns the number of bytes available for reading.

Reimplemented from BaseStream.

availableForWrite()

int availableForWrite ( )

inlineoverridevirtual

Returns the number of bytes available for writing.

Reimplemented from BaseStream.

begin() [1/2]

virtual bool begin ( )

inlinevirtualinherited

Reimplemented in AdapterAudioOutputToAudioStream, AdaptiveResamplingStream, AnalogAudioStream, AdapterAudioOutputToAudioStream, AudioInputMonitor, AudioInputMonitor, AudioStreamWrapper, AudioStreamWrapper, AudioTimeSourceStream, CallbackStream, CallbackStream, CatStream, CatStream, DynamicMemoryStream, DynamicMemoryStream, EncodedAudioStream, FilteredStream< T, TF >, FilteredStream< T, TF >, GeneratedSoundStream< T >, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, InputMerge< T >, InputMerge< T >, MemoryStream, MemoryStream, ProgressStream, ProgressStream, QueueStream< T >, QueueStream< T >, QueueStream< uint8_t >, Throttle, Throttle, TimedStream, TimerCallbackAudioStream, TimerCallbackAudioStream, VolumeMeter, VolumeMeter, AudioBoardStream, AudioEffectStream, AudioEffectStreamT< T >, AudioFFTBase, AudioInputMonitor, AudioKitStream, AudioLoRa, AudioMP34DT05, AudioOutputWithCallback, AudioStreamWrapper, AudioTimeSourceStream, AutomaticGainControlStream, CallbackStream, CatStream, ChannelFormatConverterStream, ChannelFormatConverterStreamT< T >, DynamicMemoryStream, EncodedAudioStream, Equalizer3BandsPerChannelT< T >, Equalizer3BandsPerChannelT< float >, Equalizer3BandsT< T >, Equalizer3BandsT< float >, EqualizerNBands< SampleT, AccT, NUM_TAPS, NUM_BANDS >, ESPNowStream, FileLoopT< FileType >, FileLoopT< File >, FilteredStream< T, TF >, FormatConverterStream, FrequencyDetectorAutoCorrelation, GeneratedSoundStream< T >, GoertzelStream, HLSStreamT< URLStream >, HLSStreamT< URLStreamESP32 >, I2SCodecStream, I2SStream, InputMerge< T >, MeasuringStream, MemoryStream, MiniAudioStream, MozziStream, NRF24Stream, NumberFormatConverterStream, NumberFormatConverterStreamT< TFrom, TTo >, Pipeline, Pipeline::ModifyingStreamAdapter, PortAudioStream, ProgressStream, PureDataStream, QualityAnalysisStream, QueueStream< T >, ResampleStream, ResampleStreamT< TInterpolator >, SPDIFOutput, StdioStream, SupportedRatesStream, Throttle, TimedStream, TimerCallbackAudioStream, USBAudioDeviceBase, USBAudioHostBase, VBANStream, VolumeMeter, VolumeStream, VS1053Stream, and WM8960Stream.

begin() [2/2]

bool begin ( AudioInfo info )

inline

Initialize with audio configuration.

Parameters

info	AudioInfo structure describing the audio format.

Returns

true if initialization succeeded.

clearNotifyAudioChange() [1/2]

virtual void clearNotifyAudioChange ( )

inlinevirtualinherited

Deletes all change notify subscriptions.

Reimplemented in RTSPClient< TcpClient, UdpSocket >, RTSPClient< EthernetClient, EthernetUDP >, and RTSPClient< WiFiClient, WiFiUDP >.

clearNotifyAudioChange() [2/2]

virtual void clearNotifyAudioChange ( )

inlinevirtualinherited

Deletes all change notify subscriptions.

Reimplemented in RTSPClient< TcpClient, UdpSocket >, RTSPClient< EthernetClient, EthernetUDP >, and RTSPClient< WiFiClient, WiFiUDP >.

detect()

template<class T>

void detect ( T * samples, size_t len )

inlineprotected

Detects frequency for all channels using zero crossing method.

Template Parameters

T	Sample type (int16_t, int24_t, int32_t)

Parameters

samples	Pointer to audio samples.
len	Number of samples.

detectChannel()

template<class T>

void detectChannel ( int channel, T * samples, size_t len )

inlineprotected

Detects frequency for a single channel by counting upward zero crossings.

Template Parameters

T	Sample type.

Parameters

channel	Channel index.
samples	Pointer to audio samples.
len	Number of samples.

end() [1/2]

virtual void end ( )

inlinevirtualinherited

Reimplemented in A2DPStream, AbstractURLStream, AdapterAudioOutputToAudioStream, AdaptiveResamplingStream, AnalogAudioStream, AdapterAudioOutputToAudioStream, AudioStreamWrapper, AudioStreamWrapper, CallbackStream, CallbackStream, CatStream, CatStream, DynamicMemoryStream, DynamicMemoryStream, EncodedAudioStream, FilteredStream< T, TF >, FilteredStream< T, TF >, FilteredStream< int16_t, int16_t >, GeneratedSoundStream< T >, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, InputMerge< T >, InputMerge< T >, InputMixer< T, SumT >, InputMixer< T, SumT >, MemoryStream, MemoryStream, QueueStream< T >, QueueStream< T >, QueueStream< uint8_t >, ReformatBaseStream, TimerCallbackAudioStream, TimerCallbackAudioStream, AudioBLEClient, AudioBLEClient, AudioBLEServer, AudioBLEServer, AudioBLEStream, AudioEffectStream, AudioEffectStreamT< T >, AudioFFTBase, AudioKitStream, AudioLoRa, AudioMP34DT05, AudioStreamWrapper, AutomaticGainControlStream, BufferedTaskStream, CallbackStream, CatStream, ChannelFormatConverterStream, DynamicMemoryStream, EncodedAudioStream, Equalizer3BandsPerChannelT< T >, Equalizer3BandsPerChannelT< float >, Equalizer3BandsT< T >, Equalizer3BandsT< float >, EqualizerNBands< SampleT, AccT, NUM_TAPS, NUM_BANDS >, ESPNowStream, FaustStream< DSP >, FileLoopT< FileType >, FileLoopT< File >, FilteredStream< T, TF >, FormatConverterStream, GeneratedSoundStream< T >, GoertzelStream, HLSStreamT< URLStream >, HLSStreamT< URLStreamESP32 >, HttpRequest, I2SCodecStream, I2SStream, ICYStreamT< T >, ICYStreamT< URLStream >, ICYStreamT< URLStreamESP32 >, InputMerge< T >, InputMixer< T, SumT >, MemoryStream, MiniAudioStream, MozziStream, NRF24Stream, NumberFormatConverterStream, Pipeline, Pipeline::ModifyingStreamAdapter, PortAudioStream, PureDataStream, QueueStream< T >, ReformatBaseStream, SPDIFOutput, SPIAudioSlave, StdioStream, SupportedRatesStream, TimerCallbackAudioStream, URLStream, URLStreamBufferedT< T >, URLStreamBufferedT< ICYStream >, URLStreamBufferedT< ICYStreamESP32 >, URLStreamBufferedT< URLStream >, URLStreamBufferedT< URLStreamESP32 >, URLStreamESP32, USBAudioDeviceBase, USBAudioHostBase, VolumeStream, VS1053Stream, and WM8960Stream.

end() [2/2]

virtual void end ( )

inlinevirtualinherited

Reimplemented in A2DPStream, AbstractURLStream, AdapterAudioOutputToAudioStream, AdaptiveResamplingStream, AnalogAudioStream, AdapterAudioOutputToAudioStream, AudioStreamWrapper, AudioStreamWrapper, CallbackStream, CallbackStream, CatStream, CatStream, DynamicMemoryStream, DynamicMemoryStream, EncodedAudioStream, FilteredStream< T, TF >, FilteredStream< T, TF >, FilteredStream< int16_t, int16_t >, GeneratedSoundStream< T >, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, InputMerge< T >, InputMerge< T >, InputMixer< T, SumT >, InputMixer< T, SumT >, MemoryStream, MemoryStream, QueueStream< T >, QueueStream< T >, QueueStream< uint8_t >, ReformatBaseStream, TimerCallbackAudioStream, TimerCallbackAudioStream, AudioBLEClient, AudioBLEClient, AudioBLEServer, AudioBLEServer, AudioBLEStream, AudioEffectStream, AudioEffectStreamT< T >, AudioFFTBase, AudioKitStream, AudioLoRa, AudioMP34DT05, AudioStreamWrapper, AutomaticGainControlStream, BufferedTaskStream, CallbackStream, CatStream, ChannelFormatConverterStream, DynamicMemoryStream, EncodedAudioStream, Equalizer3BandsPerChannelT< T >, Equalizer3BandsPerChannelT< float >, Equalizer3BandsT< T >, Equalizer3BandsT< float >, EqualizerNBands< SampleT, AccT, NUM_TAPS, NUM_BANDS >, ESPNowStream, FaustStream< DSP >, FileLoopT< FileType >, FileLoopT< File >, FilteredStream< T, TF >, FormatConverterStream, GeneratedSoundStream< T >, GoertzelStream, HLSStreamT< URLStream >, HLSStreamT< URLStreamESP32 >, HttpRequest, I2SCodecStream, I2SStream, ICYStreamT< T >, ICYStreamT< URLStream >, ICYStreamT< URLStreamESP32 >, InputMerge< T >, InputMixer< T, SumT >, MemoryStream, MiniAudioStream, MozziStream, NRF24Stream, NumberFormatConverterStream, Pipeline, Pipeline::ModifyingStreamAdapter, PortAudioStream, PureDataStream, QueueStream< T >, ReformatBaseStream, SPDIFOutput, SPIAudioSlave, StdioStream, SupportedRatesStream, TimerCallbackAudioStream, URLStream, URLStreamBufferedT< T >, URLStreamBufferedT< ICYStream >, URLStreamBufferedT< ICYStreamESP32 >, URLStreamBufferedT< URLStream >, URLStreamBufferedT< URLStreamESP32 >, URLStreamESP32, USBAudioDeviceBase, USBAudioHostBase, VolumeStream, VS1053Stream, and WM8960Stream.

flush() [1/2]

virtual void flush ( )

inlineoverridevirtualinherited

Reimplemented from Print.

Reimplemented in AudioStreamWrapper, AudioStreamWrapper, BufferedStream, BufferedStream, EncodedAudioStream, FilteredStream< T, TF >, FilteredStream< T, TF >, FilteredStream< int16_t, int16_t >, GeneratedSoundStream< T >, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, MemoryStream, MemoryStream, QueueStream< T >, QueueStream< T >, QueueStream< uint8_t >, ReformatBaseStream, RingBufferStream, RingBufferStream, TimedStream, AudioEffectStream, AudioEffectStreamT< T >, AudioStreamWrapper, AutomaticGainControlStream, BufferedStream, BufferedTaskStream, EncodedAudioStream, Equalizer3BandsPerChannelT< T >, Equalizer3BandsPerChannelT< float >, Equalizer3BandsT< T >, Equalizer3BandsT< float >, EqualizerNBands< SampleT, AccT, NUM_TAPS, NUM_BANDS >, FadeStream, FilteredStream< T, TF >, GeneratedSoundStream< T >, I2SStream, MeasuringStream, MemoryStream, Pipeline::ModifyingStreamAdapter, PureDataStream, QualityAnalysisStream, QueueStream< T >, ReformatBaseStream, ResampleStream, RingBufferStream, SupportedRatesStream, TimedStream, URLStream, URLStreamBufferedT< T >, URLStreamBufferedT< ICYStream >, URLStreamBufferedT< ICYStreamESP32 >, URLStreamBufferedT< URLStream >, URLStreamBufferedT< URLStreamESP32 >, and VolumeStream.

flush() [2/2]

virtual void flush ( )

inlineoverridevirtualinherited

Reimplemented from Print.

Reimplemented in AudioStreamWrapper, AudioStreamWrapper, BufferedStream, BufferedStream, EncodedAudioStream, FilteredStream< T, TF >, FilteredStream< T, TF >, FilteredStream< int16_t, int16_t >, GeneratedSoundStream< T >, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, MemoryStream, MemoryStream, QueueStream< T >, QueueStream< T >, QueueStream< uint8_t >, ReformatBaseStream, RingBufferStream, RingBufferStream, TimedStream, AudioEffectStream, AudioEffectStreamT< T >, AudioStreamWrapper, AutomaticGainControlStream, BufferedStream, BufferedTaskStream, EncodedAudioStream, Equalizer3BandsPerChannelT< T >, Equalizer3BandsPerChannelT< float >, Equalizer3BandsT< T >, Equalizer3BandsT< float >, EqualizerNBands< SampleT, AccT, NUM_TAPS, NUM_BANDS >, FadeStream, FilteredStream< T, TF >, GeneratedSoundStream< T >, I2SStream, MeasuringStream, MemoryStream, Pipeline::ModifyingStreamAdapter, PureDataStream, QualityAnalysisStream, QueueStream< T >, ReformatBaseStream, ResampleStream, RingBufferStream, SupportedRatesStream, TimedStream, URLStream, URLStreamBufferedT< T >, URLStreamBufferedT< ICYStream >, URLStreamBufferedT< ICYStreamESP32 >, URLStreamBufferedT< URLStream >, URLStreamBufferedT< URLStreamESP32 >, and VolumeStream.

frequency()

float frequency ( int channel )

inline

Returns the last detected frequency for the given channel.

Parameters

channel

Channel index.

Returns

Detected frequency in Hz, or 0 if invalid channel.

isNotifyActive() [1/2]

bool isNotifyActive ( )

inlineinherited

Checks if the automatic AudioInfo update is active.

isNotifyActive() [2/2]

bool isNotifyActive ( )

inlineinherited

Checks if the automatic AudioInfo update is active.

not_supported() [1/2]

virtual int not_supported ( int out, const char * msg = "" )

inlineprotectedvirtualinherited

not_supported() [2/2]

virtual int not_supported ( int out, const char * msg = "" )

inlineprotectedvirtualinherited

notifyAudioChange() [1/2]

void notifyAudioChange ( AudioInfo info )

inlineprotectedinherited

notifyAudioChange() [2/2]

void notifyAudioChange ( AudioInfo info )

inlineprotectedinherited

operator bool() [1/2]

virtual operator bool ( )

inlinevirtualinherited

Reimplemented in A2DPStream, AdapterAudioOutputToAudioStream, AdapterAudioOutputToAudioStream, GeneratedSoundStream< T >, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, MemoryStream, MemoryStream, TimedStream, AudioBLEStream, AudioFFTBase, GeneratedSoundStream< T >, I2SStream, ICYStreamT< T >, ICYStreamT< URLStream >, ICYStreamT< URLStreamESP32 >, MemoryStream, Pipeline, PortAudioStream, TimedStream, URLStream, and USBAudioStreamBase.

operator bool() [2/2]

virtual operator bool ( )

inlinevirtualinherited

Reimplemented in A2DPStream, AdapterAudioOutputToAudioStream, AdapterAudioOutputToAudioStream, GeneratedSoundStream< T >, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, MemoryStream, MemoryStream, TimedStream, AudioBLEStream, AudioFFTBase, GeneratedSoundStream< T >, I2SStream, ICYStreamT< T >, ICYStreamT< URLStream >, ICYStreamT< URLStreamESP32 >, MemoryStream, Pipeline, PortAudioStream, TimedStream, URLStream, and USBAudioStreamBase.

readBytes()

size_t readBytes ( uint8_t * data, size_t len )

inlineoverridevirtual

Reads bytes from the input stream and processes them for frequency detection.

Parameters

data	Buffer to store read bytes.
len	Number of bytes to read.

Returns

Number of bytes actually read.

Reimplemented from AudioStream.

readSilence() [1/2]

virtual size_t readSilence ( uint8_t * buffer, size_t length )

inlinevirtualinherited

Source to generate silence: just sets the buffer to 0.

readSilence() [2/2]

virtual size_t readSilence ( uint8_t * buffer, size_t length )

inlinevirtualinherited

Source to generate silence: just sets the buffer to 0.

refillReadBuffer() [1/2]

void refillReadBuffer ( )

inlineprotectedinherited

Refill small read buffer (e.g. 8 bytes) to avoid single byte reads when calling read().

refillReadBuffer() [2/2]

void refillReadBuffer ( )

inlineprotectedinherited

Refill small read buffer (e.g. 8 bytes) to avoid single byte reads when calling read().

removeNotifyAudioChange() [1/2]

virtual bool removeNotifyAudioChange ( AudioInfoSupport & bi )

inlinevirtualinherited

Removes a target in order not to be notified about audio changes.

removeNotifyAudioChange() [2/2]

virtual bool removeNotifyAudioChange ( AudioInfoSupport & bi )

inlinevirtualinherited

Removes a target in order not to be notified about audio changes.

setAudioInfo() [1/2]

virtual void setAudioInfo ( AudioInfo info )

inlineoverridevirtualinherited

Defines the input AudioInfo.

Implements AudioInfoSupport.

Reimplemented in AdapterAudioOutputToAudioStream, AudioInputMonitor, AudioInputMonitor, CallbackStream, CallbackStream, EncodedAudioStream, GeneratedSoundStream< T >, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, ProgressStream, ProgressStream, TimedStream, TimerCallbackAudioStream, TimerCallbackAudioStream, VolumeMeter, and VolumeMeter.

setAudioInfo() [2/2]

virtual void setAudioInfo ( AudioInfo info )

inlineoverridevirtualinherited

Defines the input AudioInfo.

Implements AudioInfoSupport.

Reimplemented in AdapterAudioOutputToAudioStream, AudioInputMonitor, AudioInputMonitor, CallbackStream, CallbackStream, EncodedAudioStream, GeneratedSoundStream< T >, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, ProgressStream, ProgressStream, TimedStream, TimerCallbackAudioStream, TimerCallbackAudioStream, VolumeMeter, and VolumeMeter.

setFrequencyCallback()

void setFrequencyCallback ( void(* callback )(int channel, float freq) )

inline

Sets a callback function to be called when a new frequency is detected.

Parameters

callback

Function pointer: void callback(int channel, float freq)

setNotifyActive() [1/2]

void setNotifyActive ( bool flag )

inlineinherited

Deactivate/Reactivate automatic AudioInfo updates: (default is active).

setNotifyActive() [2/2]

void setNotifyActive ( bool flag )

inlineinherited

Deactivate/Reactivate automatic AudioInfo updates: (default is active).

setWriteBufferSize() [1/2]

void setWriteBufferSize ( int size )

inlineinherited

setWriteBufferSize() [2/2]

void setWriteBufferSize ( int size )

inlineinherited

write() [1/2]

virtual size_t write ( uint8_t ch )

inlineoverridevirtualinherited

Reimplemented in AudioStreamWrapper, AudioStreamWrapper, BufferedStream, BufferedStream, MemoryStream, MemoryStream, RingBufferStream, RingBufferStream, AudioStreamWrapper, BufferedStream, BufferedTaskStream, MemoryStream, RingBufferStream, and URLStream.

write() [2/2]

virtual size_t write ( const uint8_t * data, size_t len )

inlineoverridevirtual

Writes bytes to the output stream and processes them for frequency detection.

Parameters

data	Buffer containing audio data.
len	Number of bytes to write.

Returns

Number of bytes actually written.

Reimplemented from AudioStream.

writeSilence() [1/2]

virtual void writeSilence ( size_t len )

inlinevirtualinherited

Writes len bytes of silence (=0).

writeSilence() [2/2]

virtual void writeSilence ( size_t len )

inlinevirtualinherited

Writes len bytes of silence (=0).

Member Data Documentation

_timeout

int _timeout = 10

protectedinherited

active

bool active = false

protected

Counting active flag (unused, kept for compatibility).

count

int count = 0

protected

Sample count (unused, kept for compatibility).

freq_callback

void(* freq_callback) (int channel, float freq)

protected

Frequency callback function.

info

AudioInfo info

protectedinherited

is_notify_active

bool is_notify_active = true

protectedinherited

notify_vector

Vector< AudioInfoSupport * > notify_vector

protectedinherited

p_in

Stream* p_in = nullptr

protected

Input stream pointer.

p_out

Print* p_out = nullptr

protected

Output stream pointer.

states

Vector<ChannelState> states

protected

State for each channel.

tmp_in

RingBuffer< uint8_t > tmp_in {0}

protectedinherited

tmp_out

RingBuffer< uint8_t > tmp_out {0}

protectedinherited

write_buffer_size

int write_buffer_size = 8

protectedinherited

---

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

• src/AudioTools/CoreAudio/Analysis/FrequencyDetectorZeroCrossing.h