DecoderL8 - Converts an 8 Bit Stream into 16Bits Most microcontrollers can not output 8 bit data directly. 8 bit data however is very memory efficient and helps if you need to store audio on constrained resources. This decoder translates 8bit data into 16bit data. By default the encoded data is represented as uint8_t, so the values are from 0 to 255. More...

#include <CodecL8.h>

Inheritance diagram for DecoderL8:

Public Member Functions
	DecoderL8 (bool isSigned=false)
	Construct a new DecoderL8 object.

	DecoderL8 (Print &out_stream, AudioInfoSupport &bi)
	Construct a new DecoderL8 object. More...

	DecoderL8 (Print &out_stream, bool active=true)
	Construct a new DecoderL8 object. More...

virtual void	addNotifyAudioChange (AudioInfoSupport &bi)
	Adds target to be notified about audio changes.

virtual AudioInfo	audioInfo ()
	provides the actual input AudioInfo

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

bool	begin () override

virtual bool	begin (AudioInfo info) override

virtual void	clearNotifyAudioChange ()
	Deletes all change notify subscriptions.

int16_t	convertSample (int16_t in)

void	end () override

bool	isNotifyActive ()
	Checks if the automatic AudioInfo update is active.

virtual bool	isResultPCM ()
	Returns true to indicate that the decoding result is PCM data.

virtual	operator bool () override

virtual bool	removeNotifyAudioChange (AudioInfoSupport &bi)
	Removes a target in order not to be notified about audio changes.

virtual void	setAudioInfo (AudioInfo from) override
	for most decoders this is not needed

void	setNotifyActive (bool flag)
	Deactivate/Reactivate automatic AudioInfo updates: (default is active)

virtual void	setOutput (AudioOutput &out_stream)
	Defines where the decoded result is written to.

virtual void	setOutput (AudioStream &out_stream)
	Defines where the decoded result is written to.

virtual void	setOutput (Print &out_stream) override
	Defines where the decoded result is written to.

void	setSigned (bool isSigned)

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

Public Attributes
int	id
	custom id to be used by application

Protected Member Functions
void	notifyAudioChange (AudioInfo info)

void	writeBlocking (Print out, uint8_t data, size_t len)

Protected Attributes
Vector< int16_t >	buffer

AudioInfo	info

bool	is_notify_active = true

bool	is_signed = false

Vector< AudioInfoSupport * >	notify_vector

Print *	p_print = nullptr

Detailed Description

DecoderL8 - Converts an 8 Bit Stream into 16Bits Most microcontrollers can not output 8 bit data directly. 8 bit data however is very memory efficient and helps if you need to store audio on constrained resources. This decoder translates 8bit data into 16bit data. By default the encoded data is represented as uint8_t, so the values are from 0 to 255.

Author: Phil Schatzmann

Copyright: GPLv3

Constructor & Destructor Documentation

◆ DecoderL8() [1/2]

DecoderL8	(	Print &	out_stream,
		bool	active = `true`
	)

inline

Construct a new DecoderL8 object.

Parameters

out_stream Output Stream to which we write the decoded result

◆ DecoderL8() [2/2]

DecoderL8	(	Print &	out_stream,
		AudioInfoSupport &	bi
	)

inline

Construct a new DecoderL8 object.

Parameters

out_stream	Output Stream to which we write the decoded result
bi	Object that will be notified about the Audio Formt (Changes)

Member Function Documentation

◆ setSigned()

void setSigned ( bool isSigned )

inline

By default the encoded values are unsigned, but you can change them to signed

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

src/AudioTools/AudioCodecs/CodecL8.h

Public Member Functions

Public Attributes

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ DecoderL8() [1/2]

◆ DecoderL8() [2/2]

Member Function Documentation

◆ setSigned()