ResampleStream Class Reference

Dynamic Resampling. We can use a variable factor to speed up or slow down the playback. More...

#include <ResampleStream.h>

Inheritance diagram for ResampleStream:

Public Member Functions
	ResampleStream ()=default
	ResampleStream (AudioOutput &out)
	ResampleStream (AudioStream &io)
	ResampleStream (Print &out)
	Support for resampling via write.
	ResampleStream (Stream &io)
	Support for resampling via write and read.
virtual void	addNotifyAudioChange (AudioInfoSupport &bi)
	Adds target to be notified about audio changes.
virtual AudioInfo	audioInfo () override
	provides the actual input AudioInfo
AudioInfo	audioInfoOut () override
int	available () override
int	availableForWrite () override
bool	begin () override
bool	begin (AudioInfo from, AudioInfo to)
bool	begin (AudioInfo from, int toRate)
bool	begin (AudioInfo from, sample_rate_t toRate)
virtual bool	begin (AudioInfo info)
bool	begin (AudioInfo info, float step)
bool	begin (ResampleConfig cfg)
virtual void	clearNotifyAudioChange ()
	Deletes all change notify subscriptions.
ResampleConfig	defaultConfig ()
	Provides the default configuraiton.
void	end () override
void	flush ()
	When buffering is active, writes the buffered audio to the output.
float	getByteFactor () override
virtual Print *	getPrint ()
float	getStepSize ()
	Returns the actual step size.
float	getStepSize (float sampleRateFrom, float sampleRateTo)
virtual Stream *	getStream ()
bool	isNotifyActive ()
	Checks if the automatic AudioInfo update is active.
virtual	operator bool ()
size_t	readBytes (uint8_t *data, size_t len) override
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.
void	resizeReadResultQueue (int size)
void	setAudioInfo (AudioInfo newInfo) override
	Defines the input AudioInfo.
void	setBuffered (bool active)
	Activates buffering to avoid small incremental writes.
void	setNotifyActive (bool flag)
	Deactivate/Reactivate automatic AudioInfo updates: (default is active)
virtual void	setOutput (AudioOutput &print)
virtual void	setOutput (Print &print) override
	Defines/Changes the output target.
void	setStepSize (float step)
	influence the sample rate
virtual void	setStream (AudioStream &stream)
virtual void	setStream (Stream &stream) override
	Defines/Changes the input & output.
void	setTargetSampleRate (int rate)
void	setWriteBufferSize (int size)
virtual TransformationReader< ReformatBaseStream > &	transformationReader ()
	Provides access to the TransformationReader.
size_t	write (const uint8_t *data, size_t len) override
virtual size_t	write (uint8_t ch) override
virtual void	writeSilence (size_t len)
	Writes len bytes of silence (=0).

Protected Member Functions
template<typename T >
T	getValue (T *data, float frame_idx, int channel)
	get the interpolated value for indicated (float) index value
template<typename T >
T	lookup (T *data, int frame, int channel)
	lookup value for indicated frame & channel: index starts with -1;
virtual int	not_supported (int out, const char *msg="")
void	notifyAudioChange (AudioInfo info)
void	refillReadBuffer ()
	Refill small read buffer (e.g. 8 bytes) to avoid single byte reads when calling read()
void	setupLastSamples (AudioInfo cfg)
	Sets up the buffer for the rollover samples.
template<typename T >
void	setupLastSamples (T *data, int frame)
	store last samples to provide values for index -1
void	setupReader ()
template<typename T >
size_t	write (Print *p_out, const uint8_t *buffer, size_t bytes, size_t &written)
	Writes the buffer to defined output after resampling.

Protected Attributes
int	_timeout = 10
int	bytes_per_frame = 0
float	idx = 0
AudioInfo	info
bool	is_buffer_active = USE_RESAMPLE_BUFFER
bool	is_first = true
bool	is_notify_active = true
Vector< uint8_t >	last_samples {0}
Vector< AudioInfoSupport * >	notify_vector
SingleBuffer< uint8_t >	out_buffer {0}
Print *	p_out = nullptr
Print *	p_print = nullptr
Stream *	p_stream = nullptr
TransformationReader< ReformatBaseStream >	reader
float	step_size = 1.0
RingBuffer< uint8_t >	tmp_in {0}
RingBuffer< uint8_t >	tmp_out {0}
int	to_sample_rate = 0
int	write_buffer_size = MAX_SINGLE_CHARS

Detailed Description

Dynamic Resampling. We can use a variable factor to speed up or slow down the playback.

Author

Phil Schatzmann

Copyright

GPLv3

Template Parameters

T

Constructor & Destructor Documentation

ResampleStream() [1/5]

ResampleStream ( )

default

ResampleStream() [2/5]

ResampleStream ( Print &  out )

inline

Support for resampling via write.

ResampleStream() [3/5]

ResampleStream ( AudioOutput &  out )

inline

Support for resampling via write. The audio information is copied from the io

ResampleStream() [4/5]

ResampleStream ( Stream &  io )

inline

Support for resampling via write and read.

ResampleStream() [5/5]

ResampleStream ( AudioStream &  io )

inline

Support for resampling via write and read. The audio information is copied from the io

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()

virtual AudioInfo audioInfo ( )

inlineoverridevirtualinherited

provides the actual input AudioInfo

Implements AudioInfoSupport.

Reimplemented in JupyterAudioT< T >, MozziStream, TimerCallbackAudioStream, EncodedAudioStream, PureDataStream, AdapterAudioOutputToAudioStream, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, and InputMerge< T >.

audioInfoOut()

AudioInfo audioInfoOut ( )

inlineoverridevirtual

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

Reimplemented from AudioInfoSupport.

available()

int available ( )

inlineoverridevirtualinherited

Reimplemented from BaseStream.

availableForWrite()

int availableForWrite ( )

inlineoverridevirtualinherited

Reimplemented from BaseStream.

begin() [1/7]

bool begin ( )

inlineoverridevirtual

Reimplemented from BaseStream.

begin() [2/7]

bool begin ( AudioInfo  from, AudioInfo  to  )

inline

begin() [3/7]

bool begin ( AudioInfo  from, int  toRate  )

inline

begin() [4/7]

bool begin ( AudioInfo  from, sample_rate_t  toRate  )

inline

begin() [5/7]

virtual bool begin ( AudioInfo  info )

inlinevirtual

begin() [6/7]

bool begin ( AudioInfo  info, float  step  )

inline

begin() [7/7]

bool begin ( ResampleConfig  cfg )

inline

clearNotifyAudioChange()

virtual void clearNotifyAudioChange ( )

inlinevirtualinherited

Deletes all change notify subscriptions.

Reimplemented in RTSPClient< TcpClient, UdpSocket >.

defaultConfig()

ResampleConfig defaultConfig ( )

inline

Provides the default configuraiton.

end()

void end ( )

inlineoverridevirtualinherited

Reimplemented from BaseStream.

flush()

void flush ( )

inlinevirtual

When buffering is active, writes the buffered audio to the output.

Reimplemented from BaseStream.

getByteFactor()

float getByteFactor ( )

inlineoverridevirtual

Implements ReformatBaseStream.

getPrint()

virtual Print * getPrint ( )

inlinevirtualinherited

getStepSize() [1/2]

float getStepSize ( )

inline

Returns the actual step size.

getStepSize() [2/2]

float getStepSize ( float  sampleRateFrom, float  sampleRateTo  )

inline

calculate the step size the sample rate: e.g. from 44200 to 22100 gives a step size of 2 in order to provide fewer samples

getStream()

virtual Stream * getStream ( )

inlinevirtualinherited

getValue()

template<typename T >

T getValue ( T *  data, float  frame_idx, int  channel  )

inlineprotected

get the interpolated value for indicated (float) index value

isNotifyActive()

bool isNotifyActive ( )

inlineinherited

Checks if the automatic AudioInfo update is active.

lookup()

template<typename T >

T lookup ( T *  data, int  frame, int  channel  )

inlineprotected

lookup value for indicated frame & channel: index starts with -1;

not_supported()

virtual int not_supported ( int  out, const char *  msg = ""  )

inlineprotectedvirtualinherited

notifyAudioChange()

void notifyAudioChange ( AudioInfo  info )

inlineprotectedinherited

operator bool()

virtual operator bool ( )

inlinevirtualinherited

Reimplemented in A2DPStream, ICYStreamT< T >, AudioBLEStream, AudioFFTBase, PortAudioStream, URLStream, I2SStream, AdapterAudioOutputToAudioStream, TimedStream, MemoryStream, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, and Pipeline.

readBytes()

size_t readBytes ( uint8_t *  data, size_t  len  )

inlineoverridevirtualinherited

Reimplemented from AudioStream.

readSilence()

virtual size_t readSilence ( uint8_t *  buffer, size_t  length  )

inlinevirtualinherited

Source to generate silence: just sets the buffer to 0.

refillReadBuffer()

void refillReadBuffer ( )

inlineprotectedinherited

Refill small read buffer (e.g. 8 bytes) to avoid single byte reads when calling read()

removeNotifyAudioChange()

virtual bool removeNotifyAudioChange ( AudioInfoSupport &  bi )

inlinevirtualinherited

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

Reimplemented in RTSPClient< TcpClient, UdpSocket >.

resizeReadResultQueue()

void resizeReadResultQueue ( int  size )

inlineinherited

Define the size of the interal read result queue: same as transformationReader().resizeResultQueue(size)

setAudioInfo()

void setAudioInfo ( AudioInfo  info )

inlineoverridevirtual

Defines the input AudioInfo.

Reimplemented from AudioStream.

setBuffered()

void setBuffered ( bool  active )

inline

Activates buffering to avoid small incremental writes.

setNotifyActive()

void setNotifyActive ( bool  flag )

inlineinherited

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

setOutput() [1/2]

virtual void setOutput ( AudioOutput &  print )

inlinevirtualinherited

Reimplemented in FormatConverterStream, and EncodedAudioStream.

setOutput() [2/2]

virtual void setOutput ( Print &  out )

inlineoverridevirtualinherited

Defines/Changes the output target.

Implements ModifyingStream.

Reimplemented in EncodedAudioStream, and FormatConverterStream.

setStepSize()

void setStepSize ( float  step )

inline

influence the sample rate

setStream() [1/2]

virtual void setStream ( AudioStream &  stream )

inlinevirtualinherited

Reimplemented in FormatConverterStream, and EncodedAudioStream.

setStream() [2/2]

virtual void setStream ( Stream &  in )

inlineoverridevirtualinherited

Defines/Changes the input & output.

Implements ModifyingStream.

Reimplemented in FormatConverterStream, and EncodedAudioStream.

setTargetSampleRate()

void setTargetSampleRate ( int  rate )

inline

setupLastSamples() [1/2]

void setupLastSamples ( AudioInfo  cfg )

inlineprotected

Sets up the buffer for the rollover samples.

setupLastSamples() [2/2]

template<typename T >

void setupLastSamples ( T *  data, int  frame  )

inlineprotected

store last samples to provide values for index -1

setupReader()

void setupReader ( )

inlineprotectedinherited

setWriteBufferSize()

void setWriteBufferSize ( int  size )

inlineinherited

transformationReader()

virtual TransformationReader< ReformatBaseStream > & transformationReader ( )

inlinevirtualinherited

Provides access to the TransformationReader.

write() [1/3]

size_t write ( const uint8_t *  data, size_t  len  )

inlineoverridevirtual

Reimplemented from AudioStream.

write() [2/3]

template<typename T >

size_t write ( Print *  p_out, const uint8_t *  buffer, size_t  bytes, size_t &  written  )

inlineprotected

Writes the buffer to defined output after resampling.

write() [3/3]

virtual size_t write ( uint8_t  ch )

inlineoverridevirtualinherited

Reimplemented in MemoryStream, AudioStreamWrapper, BufferedTaskStream, RingBufferStream, BufferedStream, and URLStream.

writeSilence()

virtual void writeSilence ( size_t  len )

inlinevirtualinherited

Writes len bytes of silence (=0).

Member Data Documentation

_timeout

int _timeout = 10

protectedinherited

bytes_per_frame

int bytes_per_frame = 0

protected

idx

float idx = 0

protected

info

AudioInfo info

protectedinherited

is_buffer_active

bool is_buffer_active = USE_RESAMPLE_BUFFER

protected

is_first

bool is_first = true

protected

is_notify_active

bool is_notify_active = true

protectedinherited

last_samples

Vector<uint8_t> last_samples {0}

protected

notify_vector

Vector<AudioInfoSupport*> notify_vector

protectedinherited

out_buffer

SingleBuffer<uint8_t> out_buffer {0}

protected

p_out

Print* p_out = nullptr

protected

p_print

Print* p_print = nullptr

protectedinherited

p_stream

Stream* p_stream = nullptr

protectedinherited

reader

TransformationReader<ReformatBaseStream> reader

protectedinherited

step_size

float step_size = 1.0

protected

tmp_in

RingBuffer<uint8_t> tmp_in {0}

protectedinherited

tmp_out

RingBuffer<uint8_t> tmp_out {0}

protectedinherited

to_sample_rate

int to_sample_rate = 0

protected

write_buffer_size

int write_buffer_size = MAX_SINGLE_CHARS

protectedinherited

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

• src/AudioTools/CoreAudio/ResampleStream.h