AudioESP32ULP Class Reference

Outputs to ESP32 DAC through the ULP (Ultra> Low Power coprocessor), freeing I2S for other uses. Connect left channel on pin 25 Connect right channel on pin 26. More...

#include <AudioESP32ULP.h>

Inheritance diagram for AudioESP32ULP:

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	availableForWrite ()
virtual bool	begin ()
bool	begin (AudioInfo info)
	Starts the processing. I the output is mono, we can determine the output pin by selecting DAC1 (gpio25) or DAC2 (gpio26)
virtual void	clearNotifyAudioChange ()
	Deletes all change notify subscriptions.
AudioInfo	defaultConfig ()
void	end ()
virtual void	flush ()
virtual bool	isDeletable ()
	If true we need to release the related memory in the destructor.
bool	isNotifyActive ()
	Checks if the automatic AudioInfo update is active.
virtual	operator bool ()
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.
void	setMinWriteBytes (int bytes)
	Selects the limit for the availableForWrite to report the data.
void	setMonoDAC (UlpDac dac)
	Selects the DAC when we have a mono signal.
void	setNotifyActive (bool flag)
	Deactivate/Reactivate automatic AudioInfo updates: (default is active)
size_t	write (const uint8_t *data, size_t len)
virtual size_t	write (uint8_t ch) override
virtual void	writeSilence (size_t len)

Protected Member Functions
uint32_t	create_I_BXI (uint32_t imm_pc)
uint32_t	create_I_WR_REG (uint32_t reg, uint32_t low_bit, uint32_t high_bit, uint32_t val)
void	notifyAudioChange (AudioInfo info)
bool	setup ()
bool	writeFrame (int16_t sample[2])

Protected Attributes
int	_timeout = 10
int	activeDACs = 3
uint8_t	bufferedOddSample = 128
const uint32_t	bufferStart = indexAddress + 1
AudioInfo	cfg
const uint32_t	dacTableStart1 = 2048 - 512
const uint32_t	dacTableStart2 = dacTableStart1 - 512
int	hertz
const uint32_t	indexAddress = opcodeCount
bool	is_active = false
bool	is_notify_active = true
int	lastFilledWord = 0
int	min_write_bytes = 128
Vector< AudioInfoSupport * >	notify_vector
const int	opcodeCount = 20
UlpDac	selected_mono_dac = ULP_DAC1
bool	stereoOutput = true
SingleBuffer< uint8_t >	tmp {MAX_SINGLE_CHARS}
int	tmpPos = 0
const int	totalSamples = totalSampleWords * 2
uint32_t	totalSampleWords
bool	waitingOddSample = true

Detailed Description

Outputs to ESP32 DAC through the ULP (Ultra> Low Power coprocessor), freeing I2S for other uses. Connect left channel on pin 25 Connect right channel on pin 26.

Version

0.1

Date

2023-03-26

Copyright

(C) 2020 Martin Laclaustra, based on bitluni's code

Member Function Documentation

addNotifyAudioChange()

virtual void addNotifyAudioChange ( AudioInfoSupport &  bi )

inlinevirtualinherited

Adds target to be notified about audio changes.

Reimplemented in CodecNOP, MP3DecoderMAD, EncodedAudioOutput, EncodedAudioStream, AACDecoderFDK, DecoderBasic, MP3DecoderHelix, OggContainerDecoder, Pipeline, and Pipeline::ModifyingStreamAdapter.

audioInfo()

virtual AudioInfo audioInfo ( )

inlineoverridevirtualinherited

provides the actual input AudioInfo

Implements AudioInfoSupport.

Reimplemented in AdapterPrintToAudioOutput, and AdapterAudioStreamToAudioOutput.

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 PureDataStream, PWMAudioOutput, ChannelFormatConverterStreamT< T >, ChannelFormatConverterStream, NumberFormatConverterStreamT< TFrom, TTo >, NumberFormatConverterStream, FormatConverterStream, Pipeline, and ResampleStream.

availableForWrite()

int availableForWrite ( )

inlinevirtual

Reimplemented from AudioOutput.

begin() [1/2]

virtual bool begin ( )

inlinevirtualinherited

Reimplemented in AudioOutputWithCallback, EncodedAudioOutput, OggContainerOutput, MetaDataFilter, and CsvOutput< T >.

begin() [2/2]

bool begin ( AudioInfo  info )

inlinevirtual

Starts the processing. I the output is mono, we can determine the output pin by selecting DAC1 (gpio25) or DAC2 (gpio26)

Reimplemented from AudioOutput.

end()

void end ( )

inlinevirtual

Reimplemented from AudioOutput.

flush()

virtual void flush ( )

inlinevirtualinherited

Reimplemented from Print.

isDeletable()

virtual bool isDeletable ( )

inlinevirtualinherited

If true we need to release the related memory in the destructor.

Reimplemented in AdapterPrintToAudioOutput, and AdapterAudioStreamToAudioOutput.

operator bool()

virtual operator bool ( )

inlinevirtualinherited

Reimplemented in EncodedAudioOutput, and RTSPOutput.

setAudioInfo()

virtual void setAudioInfo ( AudioInfo  info )

inlineoverridevirtualinherited

Defines the input AudioInfo.

Implements AudioInfoSupport.

Reimplemented in ChannelsSelectOutput, AdapterPrintToAudioOutput, MultiOutput, AdapterAudioStreamToAudioOutput, CsvOutput< T >, PWMAudioOutput, and EncodedAudioOutput.

write()

size_t write ( const uint8_t *  data, size_t  len  )

inlinevirtual

Implements AudioOutput.

writeSilence()

virtual void writeSilence ( size_t  len )

inlinevirtualinherited

Writes n 0 values (= silence)

Parameters

len

Member Data Documentation

totalSampleWords

uint32_t totalSampleWords

protected

Initial value:

=
      2048 - 512 - 512 - (opcodeCount + 1)

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

• src/AudioTools/AudioLibs/AudioESP32ULP.h