I2SStream Class Reference

We support the Stream interface for the I2S access. In addition we allow a separate mute pin which might also be used to drive a LED... More...

#include <I2SStream.h>

Inheritance diagram for I2SStream:

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 ()
virtual int	available () override
	Provides the available audio data.
virtual int	availableForWrite () override
	Provides the available audio data.
bool	begin ()
bool	begin (I2SConfig cfg)
	Starts the I2S interface.
virtual void	clearNotifyAudioChange ()
	Deletes all change notify subscriptions.
I2SConfig	defaultConfig (RxTxMode mode=TX_MODE)
	Provides the default configuration.
I2SDriver *	driver ()
	Provides access to the driver.
void	end ()
	Stops the I2S interface.
void	flush () override
bool	isActive ()
	Returns true if i2s is active.
bool	isNotifyActive ()
	Checks if the automatic AudioInfo update is active.
	operator bool () override
	Returns true if i2s is active.
virtual size_t	readBytes (uint8_t *data, size_t len) override
	Reads the audio data.
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 void	setAudioInfo (AudioInfo info)
	updates the sample rate dynamically
void	setNotifyActive (bool flag)
	Deactivate/Reactivate automatic AudioInfo updates: (default is active)
virtual size_t	write (const uint8_t *data, size_t len)
	Writes the audio data to I2S.
virtual size_t	write (uint8_t ch) override
virtual void	writeSilence (size_t len)
	Writes len bytes of silence (=0).

Protected Member Functions
void	mute (bool is_mute)
	set mute pin on or off
virtual int	not_supported (int out, const char *msg="")
void	notifyAudioChange (AudioInfo info)
void	refillReadBuffer ()

Protected Attributes
int	_timeout = 10
I2SDriver	i2s
AudioInfo	info
bool	is_active = false
bool	is_notify_active = true
int	mute_pin = -1
Vector< AudioInfoSupport * >	notify_vector
RingBuffer< uint8_t >	tmp_in {0}
RingBuffer< uint8_t >	tmp_out {0}

Detailed Description

We support the Stream interface for the I2S access. In addition we allow a separate mute pin which might also be used to drive a LED...

Template Parameters

T

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, MP3DecoderHelix, MP3DecoderMAD, OggContainerDecoder, Pipeline, and Pipeline::ModifyingStreamAdapter.

audioInfo()

virtual AudioInfo audioInfo ( )

inlineoverridevirtualinherited

provides the actual input AudioInfo

Implements AudioInfoSupport.

Reimplemented in JupyterAudioT< T >, MozziStream, TimerCallbackAudioStream, 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 PureDataStream, PWMAudioOutput, ChannelFormatConverterStreamT< T >, ChannelFormatConverterStream, NumberFormatConverterStreamT< TFrom, TTo >, NumberFormatConverterStream, FormatConverterStream, Pipeline, and ResampleStream.

available()

virtual int available ( )

inlineoverridevirtual

Provides the available audio data.

Reimplemented from BaseStream.

availableForWrite()

virtual int availableForWrite ( )

inlineoverridevirtual

Provides the available audio data.

Reimplemented from BaseStream.

begin()

bool begin ( )

inlinevirtual

Reimplemented from BaseStream.

end()

void end ( )

inlinevirtual

Stops the I2S interface.

Reimplemented from BaseStream.

flush()

void flush ( )

inlineoverridevirtual

Reimplemented from BaseStream.

operator bool()

operator bool ( )

inlineoverridevirtual

Returns true if i2s is active.

Reimplemented from AudioStream.

readBytes()

virtual size_t readBytes ( uint8_t *  data, size_t  len  )

inlineoverridevirtual

Reads the audio data.

Reimplemented from AudioStream.

setAudioInfo()

virtual void setAudioInfo ( AudioInfo  info )

inlinevirtual

updates the sample rate dynamically

Reimplemented from AudioStream.

write() [1/2]

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

inlinevirtual

Writes the audio data to I2S.

Reimplemented from AudioStream.

write() [2/2]

virtual size_t write ( uint8_t  ch )

inlineoverridevirtualinherited

Reimplemented in BufferedTaskStream, and BufferedStream.

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

• src/AudioTools/CoreAudio/AudioI2S/I2SStream.h