TimerCallbackAudioStream Class Reference

Callback driven Audio Source (rx_tx_mode==RX_MODE) or Audio Sink (rx_tx_mode==TX_MODE). This class allows to to integrate external libraries in order to consume or generate a data stream which is based on a timer. More...

#include <AudioStreams.h>

Inheritance diagram for TimerCallbackAudioStream:

Public Member Functions
virtual void	addNotifyAudioChange (AudioInfoSupport &bi)
	Adds target to be notified about audio changes.
AudioInfo	audioInfo ()
	provides the actual input AudioInfo
TimerCallbackAudioStreamInfo	audioInfoExt ()
	Provides the current audio information.
virtual AudioInfo	audioInfoOut ()
	provides the actual output AudioInfo: this is usually the same as audioInfo() unless we use a transforming stream
int	available () override
	Returns the available bytes in the buffer: to be avoided.
virtual int	availableForWrite () override
bool	begin ()
	Restart the processing.
void	begin (TimerCallbackAudioStreamInfo config)
void	clear ()
	Clears all the data in the buffer.
virtual void	clearNotifyAudioChange ()
	Deletes all change notify subscriptions.
uint16_t	currentSampleRate ()
	Provides the effective sample rate.
TimerCallbackAudioStreamInfo	defaultConfig ()
	Provides the default configuration.
void	end ()
	Stops the processing.
void	flush () override
	empties the buffer
bool	isNotifyActive ()
	Checks if the automatic AudioInfo update is active.
virtual	operator bool ()
int	peek () override
	peeks a byte - to be avoided
int	read () override
	reads a byte - to be avoided
size_t	readBytes (uint8_t *data, size_t len) override
	Use this method !!
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 audio information
void	setNotifyActive (bool flag)
	Deactivate/Reactivate automatic AudioInfo updates: (default is active)
void	setOutput (Print &out)
	Defines/Changes the output target.
void	setStream (Print &out)
void	setStream (Stream &io)
	Defines/Changes the input & output.
size_t	write (const uint8_t *data, size_t len) override
	Use this method: write an array.
size_t	write (uint8_t c) override
	writes a byte to the buffer
virtual void	writeSilence (size_t len)
	Writes len bytes of silence (=0).

Protected Member Functions
virtual void	measureSampleRate ()
	calculates the effective sample rate
virtual int	not_supported (int out, const char *msg="")
void	notifyAudioChange (AudioInfo info)
virtual void	printSampleRate ()
	log and update effective sample rate
virtual size_t	readExt (uint8_t *data, size_t len) override
void	refill ()
void	refillReadBuffer ()
virtual size_t	writeExt (const uint8_t *data, size_t len) override

Protected Attributes
int	_timeout = 10
bool	active = false
RingBuffer< uint8_t > *	buffer = nullptr
TimerCallbackAudioStreamInfo	cfg
uint32_t	currentRateValue = 0
uint8_t *	frame = nullptr
uint16_t(*	frameCallback )(uint8_t *data, uint16_t len)
uint16_t	frameSize = 0
AudioInfo	info
bool	is_notify_active = true
unsigned long	lastTimestamp = 0u
Vector< AudioInfoSupport * >	notify_vector
Stream *	p_in = nullptr
Print *	p_out = nullptr
uint32_t	printCount = 0
uint32_t	time = 0
TimerAlarmRepeating *	timer = nullptr
RingBuffer< uint8_t >	tmp_in {0}
RingBuffer< uint8_t >	tmp_out {0}

Friends
void	timerCallback (void *obj)

Detailed Description

Callback driven Audio Source (rx_tx_mode==RX_MODE) or Audio Sink (rx_tx_mode==TX_MODE). This class allows to to integrate external libraries in order to consume or generate a data stream which is based on a timer.

Author

Phil Schatzmann

Copyright

GPLv3

---

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

• src/AudioTools/CoreAudio/AudioStreams.h