VBANStream Class Reference

VBAN Audio Source and Sink for the ESP32. For further details please see https://vb-audio.com/Voicemeeter/vban.htm . Inspired by https://github.com/rkinnett/ESP32-VBAN-Audio-Source/tree/master and https://github.com/rkinnett/ESP32-VBAN-Network-Audio-Player. More...

#include <VBANStream.h>

Inheritance diagram for VBANStream:

Public Member Functions
virtual void	addNotifyAudioChange (AudioInfoSupport &bi)
	Adds target to be notified about audio changes.
virtual AudioInfo	audioInfo () override
	provides the actual input AudioInfo
virtual AudioInfo	audioInfoOut ()
int	available ()
int	availableForWrite ()
bool	begin ()
bool	begin (VBANConfig cfg)
virtual void	clearNotifyAudioChange ()
	Deletes all change notify subscriptions.
VBANConfig	defaultConfig (RxTxMode mode=TX_MODE)
virtual void	end ()
virtual void	flush () override
bool	isNotifyActive ()
	Checks if the automatic AudioInfo update is active.
virtual	operator bool ()
size_t	readBytes (uint8_t *data, size_t len) override
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.
void	setAudioInfo (AudioInfo info) override
	Defines the input AudioInfo.
void	setNotifyActive (bool flag)
	Deactivate/Reactivate automatic AudioInfo updates: (default is active)
void	setOutput (Print &out)
void	setWriteBufferSize (int size)
size_t	write (const uint8_t *data, size_t len) override
virtual size_t	write (uint8_t ch) override
virtual void	writeSilence (size_t len)
	Writes len bytes of silence (=0).

Protected Member Functions
bool	begin_rx ()
bool	begin_tx ()
bool	configure_tx ()
void	configure_vban (VBanSampleRates rate)
virtual int	not_supported (int out, const char *msg="")
void	notifyAudioChange (AudioInfo info)
void	receive_udp (AsyncUDPPacket &packet)
	VBAN adjusts the number of samples per packet according to sample rate. Assuming 16-bit PCM mono, sample rates 11025, 22050, 44100, and 88200 yield packets containing 64, 128, 256, and 256 samples per packet, respectively. The even-thousands sample rates below 48000 yield non-power-of-2 lengths. For example, sample rate 24000 yields 139 samples per packet. This VBAN->DMA->DAC method seems to require the dma buffer length be set equal to the number of samples in each VBAN packet. ESP32 I2S/DMA does not seem to handle non-power-of-2 buffer lengths well. Sample rate 24000 doesn't work reliably at all. Sample rate 32000 is stable but stutters. Recommend selecting from sample rates 11025, 22050, 44100, and above And set samplesPerPacket to 64 for 11025, 128 for 22050, or 256 for all else.
void	refillReadBuffer ()
	Refill small read buffer (e.g. 8 bytes) to avoid single byte reads when calling read()
void	safe_strncpy (char *dest, const char *src, size_t dest_size)
void	sendVbanPing0Reply (AsyncUDPPacket &sourcePacket)
void	start_wifi ()
const char *	toString (IPAddress adr)
int	vban_sample_rate ()

Protected Attributes
int	_timeout = 10
bool	available_active = false
const IPAddress	broadcast_address {0, 0, 0, 0}
size_t	bytes_received = 0
VBANConfig	cfg
AudioInfo	info
bool	is_notify_active = true
Vector< AudioInfoSupport * >	notify_vector
Print *	p_out = nullptr
uint32_t	packet_counter = 0
BufferRTOS< uint8_t >	rx_buffer { 0}
Throttle	throttle
RingBuffer< uint8_t >	tmp_in {0}
RingBuffer< uint8_t >	tmp_out {0}
SingleBuffer< int16_t >	tx_buffer {0}
AsyncUDP	udp
bool	udp_connected = false
VBan	vban
int	write_buffer_size = MAX_SINGLE_CHARS

Detailed Description

VBAN Audio Source and Sink for the ESP32. For further details please see https://vb-audio.com/Voicemeeter/vban.htm . Inspired by https://github.com/rkinnett/ESP32-VBAN-Audio-Source/tree/master and https://github.com/rkinnett/ESP32-VBAN-Network-Audio-Player.

Note

Supported only on Arduino ESP32 platforms with WiFi support!

Author

Phil Schatzmann

Copyright

GPLv3

Member Function Documentation

addNotifyAudioChange()

virtual void addNotifyAudioChange ( AudioInfoSupport &  bi )

inlinevirtualinherited

Adds target to be notified about audio changes.

Reimplemented in CodecNOP, EncodedAudioOutput, EncodedAudioStream, AACDecoderFDK, DecoderBasic, CodecChain, MP3DecoderHelix, MP3DecoderMAD, OggContainerDecoder, RTSPClient< TcpClient, UdpSocket >, Pipeline, and Pipeline::ModifyingStreamAdapter.

audioInfo()

virtual AudioInfo audioInfo ( )

inlineoverridevirtualinherited

provides the actual input AudioInfo

Implements AudioInfoSupport.

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

audioInfoOut()

virtual AudioInfo audioInfoOut ( )

inlinevirtualinherited

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

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

available()

int available ( )

inlinevirtual

Reimplemented from BaseStream.

availableForWrite()

int availableForWrite ( )

inlinevirtual

Reimplemented from BaseStream.

begin() [1/2]

bool begin ( )

inlinevirtual

Reimplemented from BaseStream.

begin() [2/2]

bool begin ( VBANConfig  cfg )

inline

begin_rx()

bool begin_rx ( )

inlineprotected

begin_tx()

bool begin_tx ( )

inlineprotected

clearNotifyAudioChange()

virtual void clearNotifyAudioChange ( )

inlinevirtualinherited

Deletes all change notify subscriptions.

Reimplemented in RTSPClient< TcpClient, UdpSocket >.

configure_tx()

bool configure_tx ( )

inlineprotected

configure_vban()

void configure_vban ( VBanSampleRates  rate )

inlineprotected

defaultConfig()

VBANConfig defaultConfig ( RxTxMode  mode = TX_MODE )

inline

end()

virtual void end ( )

inlinevirtualinherited

Reimplemented in FaustStream< DSP >, AudioMP34DT05, I2SCodecStream, MozziStream, PureDataStream, SPDIFOutput, VS1053Stream, WM8960Stream, AdaptiveResamplingStream, AudioLoRa, ESPNowStream, BufferedTaskStream, URLStreamBufferedT< T >, URLStreamBufferedT< ICYStream >, USBAudioDeviceBase, Equalizer3Bands, I2SStream, AudioStreamWrapper, TimerCallbackAudioStream, FormatConverterStream, GoertzelStream, FileLoopT< FileType >, FileLoopT< File >, EqualizerNBands< SampleT, AccT, NUM_TAPS, NUM_BANDS >, EncodedAudioStream, AudioKitStream, MiniAudioStream, PortAudioStream, StdioStream, A2DPStream, HLSStreamT< URLStream >, HttpRequest, ICYStreamT< T >, URLStream, URLStreamESP32, NRF24Stream, SPIAudioSlave, AnalogAudioStream, AudioEffectStreamT< T >, AudioEffectStream, Equalizer3BandsPerChannel, ReformatBaseStream, AdapterAudioOutputToAudioStream, MemoryStream, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, InputMixer< T, SumT >, InputMerge< T >, CallbackStream, FilteredStream< T, TF >, FilteredStream< int16_t, int16_t >, ChannelFormatConverterStream, NumberFormatConverterStream, CatStream, QueueStream< T >, QueueStream< uint8_t >, DynamicMemoryStream, Pipeline, Pipeline::ModifyingStreamAdapter, VolumeStream, AudioFFTBase, AudioBLEClient, AudioBLEClient, AudioBLEServer, AudioBLEServer, AbstractURLStream, and AudioBLEStream.

flush()

virtual void flush ( )

inlineoverridevirtualinherited

Reimplemented from Print.

Reimplemented in PureDataStream, URLStreamBufferedT< T >, URLStreamBufferedT< ICYStream >, ReformatBaseStream, AudioStreamWrapper, ResampleStream, EncodedAudioStream, URLStream, BufferedTaskStream, I2SStream, MemoryStream, RingBufferStream, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, and BufferedStream.

isNotifyActive()

bool isNotifyActive ( )

inlineinherited

Checks if the automatic AudioInfo update is active.

not_supported()

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

inlineprotectedvirtualinherited

notifyAudioChange()

void notifyAudioChange ( AudioInfo  info )

inlineprotectedinherited

operator bool()

virtual operator bool ( )

inlinevirtualinherited

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

readBytes()

size_t readBytes ( uint8_t *  data, size_t  len  )

inlineoverridevirtual

Reimplemented from AudioStream.

readSilence()

virtual size_t readSilence ( uint8_t *  buffer, size_t  length  )

inlinevirtualinherited

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

receive_udp()

void receive_udp ( AsyncUDPPacket &  packet )

inlineprotected

VBAN adjusts the number of samples per packet according to sample rate. Assuming 16-bit PCM mono, sample rates 11025, 22050, 44100, and 88200 yield packets containing 64, 128, 256, and 256 samples per packet, respectively. The even-thousands sample rates below 48000 yield non-power-of-2 lengths. For example, sample rate 24000 yields 139 samples per packet. This VBAN->DMA->DAC method seems to require the dma buffer length be set equal to the number of samples in each VBAN packet. ESP32 I2S/DMA does not seem to handle non-power-of-2 buffer lengths well. Sample rate 24000 doesn't work reliably at all. Sample rate 32000 is stable but stutters. Recommend selecting from sample rates 11025, 22050, 44100, and above And set samplesPerPacket to 64 for 11025, 128 for 22050, or 256 for all else.

refillReadBuffer()

void refillReadBuffer ( )

inlineprotectedinherited

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

removeNotifyAudioChange()

virtual bool removeNotifyAudioChange ( AudioInfoSupport &  bi )

inlinevirtualinherited

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

Reimplemented in RTSPClient< TcpClient, UdpSocket >.

safe_strncpy()

void safe_strncpy ( char *  dest, const char *  src, size_t  dest_size  )

inlineprotected

sendVbanPing0Reply()

void sendVbanPing0Reply ( AsyncUDPPacket &  sourcePacket )

inlineprotected

setAudioInfo()

void setAudioInfo ( AudioInfo  info )

inlineoverridevirtual

Defines the input AudioInfo.

Reimplemented from AudioStream.

setNotifyActive()

void setNotifyActive ( bool  flag )

inlineinherited

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

setOutput()

void setOutput ( Print &  out )

inline

setWriteBufferSize()

void setWriteBufferSize ( int  size )

inlineinherited

start_wifi()

void start_wifi ( )

inlineprotected

toString()

const char * toString ( IPAddress  adr )

inlineprotected

vban_sample_rate()

int vban_sample_rate ( )

inlineprotected

write() [1/2]

size_t write ( const uint8_t *  data, size_t  len  )

inlineoverridevirtual

Reimplemented from AudioStream.

write() [2/2]

virtual size_t write ( uint8_t  ch )

inlineoverridevirtualinherited

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

writeSilence()

virtual void writeSilence ( size_t  len )

inlinevirtualinherited

Writes len bytes of silence (=0).

Member Data Documentation

_timeout

int _timeout = 10

protectedinherited

available_active

bool available_active = false

protected

broadcast_address

const IPAddress broadcast_address {0, 0, 0, 0}

protected

bytes_received

size_t bytes_received = 0

protected

cfg

VBANConfig cfg

protected

info

AudioInfo info

protectedinherited

is_notify_active

bool is_notify_active = true

protectedinherited

notify_vector

Vector<AudioInfoSupport*> notify_vector

protectedinherited

p_out

Print* p_out = nullptr

protected

packet_counter

uint32_t packet_counter = 0

protected

rx_buffer

BufferRTOS<uint8_t> rx_buffer { 0}

protected

throttle

Throttle throttle

protected

tmp_in

RingBuffer<uint8_t> tmp_in {0}

protectedinherited

tmp_out

RingBuffer<uint8_t> tmp_out {0}

protectedinherited

tx_buffer

SingleBuffer<int16_t> tx_buffer {0}

protected

udp

AsyncUDP udp

protected

udp_connected

bool udp_connected = false

protected

vban

VBan vban

protected

write_buffer_size

int write_buffer_size = MAX_SINGLE_CHARS

protectedinherited

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

• src/AudioTools/Communication/VBANStream.h