MP3DecoderMini Class Reference

MP3 Decoder using https://github.com/pschatzmann/minimp3. This decoder does not provide any good results and it is not suited to decode any audio above 32000 on an ESP32. So the sample rate is limited by the MINIMP3_MAX_SAMPLE_RATE variable. More...

#include <CodecMP3Mini.h>

Inheritance diagram for MP3DecoderMini:

Public Member Functions
	MP3DecoderMini ()=default
	~MP3DecoderMini ()
	Destroy the MP3DecoderMini object.
virtual void	addNotifyAudioChange (AudioInfoSupport &bi)
	Adds target to be notified about audio changes.
AudioInfo	audioInfo () override
	provides the actual input AudioInfo
virtual AudioInfo	audioInfoOut ()
bool	begin ()
	Starts the processing.
virtual bool	begin (AudioInfo info) override
virtual void	clearNotifyAudioChange ()
	Deletes all change notify subscriptions.
void	end ()
	Releases the reserved memory.
void	flush ()
	Decodes the last outstanding data.
Print *	getOutput ()
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 ()
	checks if the class is active
virtual bool	removeNotifyAudioChange (AudioInfoSupport &bi)
	Removes a target in order not to be notified about audio changes.
void	setAudioInfo (AudioInfo from) override
	for most decoders this is not needed
void	setBufferLength (int len)
virtual bool	setCodecConfig (const uint8_t *data, size_t len)
	Some decoders need e.g. a magic cookie to provide the relevant info for decoding.
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.
void	setOutput (Print &outStream)
	Defines the output Stream.
void	setSampleRateLimit (int limit)
size_t	write (const uint8_t *data, size_t len)
	Write mp3 data to decoder.

Public Attributes
int	id
	custom id to be used by application

Protected Member Functions
void	decode (int write_len)
	Process single bytes so that we can decode a full frame when it is available.
void	f32_to_s16 (float *in, int16_t *out, int num_samples)
void	notifyAudioChange (AudioInfo info)
void	provideResult (int samples)
	Provides Metadata and PCM data.
void	writeBlocking (Print *out, uint8_t *data, size_t len)

Protected Attributes
bool	active
Vector< uint8_t >	buffer
size_t	buffer_pos = 0
size_t	buffer_size = 5 * 1024
AudioInfo	info
bool	is_notify_active = true
mp3dec_t	mp3d
mp3dec_frame_info_t	mp3dec_info
Vector< AudioInfoSupport * >	notify_vector
Print *	out = nullptr
Print *	p_print = nullptr
Vector< mp3d_sample_t >	pcm
int	sample_rate_limit = 44100

Detailed Description

MP3 Decoder using https://github.com/pschatzmann/minimp3. This decoder does not provide any good results and it is not suited to decode any audio above 32000 on an ESP32. So the sample rate is limited by the MINIMP3_MAX_SAMPLE_RATE variable.

Author

Phil Schatzmann

Copyright

GPLv3

Constructor & Destructor Documentation

MP3DecoderMini()

MP3DecoderMini ( )

default

~MP3DecoderMini()

~MP3DecoderMini ( )

inline

Destroy the MP3DecoderMini object.

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, CodecChain, MP3DecoderHelix, MP3DecoderMAD, OggContainerDecoder, RTSPClient< TcpClient, UdpSocket >, Pipeline, and Pipeline::ModifyingStreamAdapter.

audioInfo()

AudioInfo audioInfo ( )

inlineoverridevirtualinherited

provides the actual input AudioInfo

Implements AudioInfoSupport.

Reimplemented in CodecNOP, DecoderBasic, DSFDecoder, MP3DecoderHelix, MP3DecoderMAD, OpusAudioDecoder, OpusMultiStreamAudioDecoder, VorbisDecoder, WAVDecoder, WavIMADecoder, OggContainerDecoder, and VorbisDecoder.

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 MP3EncoderShine, PureDataStream, PWMAudioOutput< PWMDriverT >, ChannelFormatConverterStreamT< T >, ChannelFormatConverterStream, NumberFormatConverterStreamT< TFrom, TTo >, NumberFormatConverterStream, FormatConverterStream, Pipeline, ResampleStream, and ResampleStreamT< TInterpolator >.

begin() [1/2]

bool begin ( )

inlinevirtual

Starts the processing.

Reimplemented from AudioDecoder.

begin() [2/2]

virtual bool begin ( AudioInfo  info )

inlineoverridevirtualinherited

Reimplemented from AudioWriter.

Reimplemented in DecoderBasic, and OggContainerDecoder.

clearNotifyAudioChange()

virtual void clearNotifyAudioChange ( )

inlinevirtualinherited

Deletes all change notify subscriptions.

Reimplemented in RTSPClient< TcpClient, UdpSocket >.

decode()

void decode ( int  write_len )

inlineprotected

Process single bytes so that we can decode a full frame when it is available.

end()

void end ( )

inlinevirtual

Releases the reserved memory.

Reimplemented from AudioDecoder.

f32_to_s16()

void f32_to_s16 ( float *  in, int16_t *  out, int  num_samples  )

inlineprotected

flush()

void flush ( )

inline

Decodes the last outstanding data.

getOutput()

Print * getOutput ( )

inlineinherited

isNotifyActive()

bool isNotifyActive ( )

inlineinherited

Checks if the automatic AudioInfo update is active.

isResultPCM()

virtual bool isResultPCM ( )

inlinevirtualinherited

Returns true to indicate that the decoding result is PCM data.

Reimplemented in CopyDecoder, DecoderNetworkFormat, and ContainerM4A.

notifyAudioChange()

void notifyAudioChange ( AudioInfo  info )

inlineprotectedinherited

operator bool()

virtual operator bool ( )

inlinevirtual

checks if the class is active

Implements AudioWriter.

provideResult()

void provideResult ( int  samples )

inlineprotected

Provides Metadata and PCM data.

removeNotifyAudioChange()

virtual bool removeNotifyAudioChange ( AudioInfoSupport &  bi )

inlinevirtualinherited

Removes a target in order not to be notified about audio changes.

Reimplemented in RTSPClient< TcpClient, UdpSocket >.

setAudioInfo()

void setAudioInfo ( AudioInfo  from )

inlineoverridevirtualinherited

for most decoders this is not needed

Implements AudioWriter.

Reimplemented in DecoderALAC, CodecChain, DSFDecoder, DecoderL8, OpusAudioDecoder, OpusMultiStreamAudioDecoder, CodecNOP, G729Decoder, and G7xxDecoder.

setBufferLength()

void setBufferLength ( int  len )

inline

setCodecConfig()

virtual bool setCodecConfig ( const uint8_t *  data, size_t  len  )

inlinevirtualinherited

Some decoders need e.g. a magic cookie to provide the relevant info for decoding.

Reimplemented in DecoderALAC, and MultiDecoder.

setNotifyActive()

void setNotifyActive ( bool  flag )

inlineinherited

Deactivate/Reactivate automatic AudioInfo updates: (default is active)

setOutput() [1/3]

virtual void setOutput ( AudioOutput &  out_stream )

inlinevirtualinherited

Defines where the decoded result is written to.

Reimplemented in ADTSDecoder, CodecChain, MTSDecoder, MTSDecoderTSDemux, and MetaDataFilterDecoder.

setOutput() [2/3]

virtual void setOutput ( AudioStream &  out_stream )

inlinevirtualinherited

Defines where the decoded result is written to.

Reimplemented in ADTSDecoder, CodecChain, MTSDecoder, MTSDecoderTSDemux, and MetaDataFilterDecoder.

setOutput() [3/3]

void setOutput ( Print &  outStream )

inlinevirtual

Defines the output Stream.

Reimplemented from AudioDecoder.

setSampleRateLimit()

void setSampleRateLimit ( int  limit )

inline

write()

size_t write ( const uint8_t *  data, size_t  len  )

inlinevirtual

Write mp3 data to decoder.

Implements AudioWriter.

writeBlocking()

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

inlineprotectedinherited

Member Data Documentation

active

bool active

protected

buffer

Vector<uint8_t> buffer

protected

buffer_pos

size_t buffer_pos = 0

protected

buffer_size

size_t buffer_size = 5 * 1024

protected

id

int id

inherited

custom id to be used by application

info

AudioInfo info

protectedinherited

is_notify_active

bool is_notify_active = true

protectedinherited

mp3d

mp3dec_t mp3d

protected

mp3dec_info

mp3dec_frame_info_t mp3dec_info

protected

notify_vector

Vector<AudioInfoSupport*> notify_vector

protectedinherited

out

Print* out = nullptr

protected

p_print

Print* p_print = nullptr

protectedinherited

pcm

Vector<mp3d_sample_t> pcm

protected

sample_rate_limit

int sample_rate_limit = 44100

protected

---

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

• src/AudioTools/AudioCodecs/CodecMP3Mini.h