MetaDataFilter Class Reference

Class which filters out ID3v1 and ID3v2 Metadata and provides only the audio data to the decoder. More...

#include <MetaDataFilter.h>

Inheritance diagram for MetaDataFilter:

Classes
struct	ID3v2
	ID3 verion 2 TAG Header (10 bytes) More...
struct	Range
	Metadata range. More...

Public Member Functions
	MetaDataFilter ()=default
	Default Constructor.
	MetaDataFilter (AudioWriter &out)
	Constructor which assigns the decoder.
	MetaDataFilter (Print &out)
	Constructor which assigns the decoder.
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 ()
	provides the actual output AudioInfo: this is usually the same as audioInfo() unless we use a transforming stream
virtual int	availableForWrite () override
bool	begin () override
	(Re)starts the processing
virtual bool	begin (AudioInfo info)
virtual void	clearNotifyAudioChange ()
	Deletes all change notify subscriptions.
void	end () override
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	setNotifyActive (bool flag)
	Deactivate/Reactivate automatic AudioInfo updates: (default is active)
void	setOutput (AudioWriter &out)
	Defines the decoder to which we write the data.
void	setOutput (Print &out)
	Defines the decoder to which we write the data.
size_t	write (const uint8_t *data, size_t len) override
	Writes the data to the decoder.
virtual size_t	write (uint8_t ch) override
virtual void	writeSilence (size_t len)

Protected Types
enum	MetaType { TAG , TAG_PLUS , ID3 }

Protected Member Functions
uint32_t	calcSizeID3v2 (uint8_t chars[4])
bool	find (const char *str, size_t len, int &pos, MetaType &type)
	find the tag position in the string;
bool	findTag (const uint8_t *data, size_t len, int &pos_tag, int &meta_len)
	determines if the data conatins a ID3v1 or ID3v2 tag
void	notifyAudioChange (AudioInfo info)

Protected Attributes
int	_timeout = 10
AudioInfo	cfg
int	current_pos = 0
bool	is_active = false
bool	is_notify_active = true
struct audio_tools::MetaDataFilter::Range	metadata_range
Vector< AudioInfoSupport * >	notify_vector
Print *	p_out = nullptr
AudioWriter *	p_writer = nullptr
int	start = 0
struct audio_tools::MetaDataFilter::ID3v2	tagv2
SingleBuffer< uint8_t >	tmp {MAX_SINGLE_CHARS}
int	tmpPos = 0

Detailed Description

Class which filters out ID3v1 and ID3v2 Metadata and provides only the audio data to the decoder.

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, 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()

virtual int availableForWrite ( )

inlineoverridevirtualinherited

Reimplemented from Print.

Reimplemented in RTSPOutput.

begin() [1/2]

bool begin ( )

inlineoverridevirtual

(Re)starts the processing

Reimplemented from AudioOutput.

begin() [2/2]

virtual bool begin ( AudioInfo  info )

inlinevirtualinherited

Reimplemented in AudioESP32ULP, CsvOutput< T >, and EncodedAudioOutput.

end()

void end ( )

inlineoverridevirtual

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() [1/2]

size_t write ( const uint8_t *  data, size_t  len  )

inlineoverridevirtual

Writes the data to the decoder.

Implements AudioOutput.

write() [2/2]

virtual size_t write ( uint8_t  ch )

inlineoverridevirtualinherited

Reimplemented in OversamplingDAC.

writeSilence()

virtual void writeSilence ( size_t  len )

inlinevirtualinherited

Writes n 0 values (= silence)

Parameters

len

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

• src/AudioTools/CoreAudio/AudioMetaData/MetaDataFilter.h