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

Inheritance diagram for ResampleStream:

Public Member Functions
	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 AudioInfo	audioInfo () override

int	available () override

int	availableForWrite () override

virtual bool	begin ()

bool	begin (AudioInfo from, int toRate)

bool	begin (AudioInfo info, float step)

bool	begin (ResampleConfig cfg)

ResampleConfig	defaultConfig ()
	Provides the default configuraiton.

virtual void	end ()

virtual void	flush () override

virtual Print *	getPrint ()

float	getStepSize ()
	Returns the actual step size.

float	getStepSize (float sampleRateFrom, float sampleRateTo)

virtual Stream *	getStream ()

	operator bool ()

size_t	readBytes (uint8_t *data, size_t size) override

virtual size_t	readSilence (uint8_t *buffer, size_t length)
	Source to generate silence: just sets the buffer to 0.

void	setAudioInfo (AudioInfo info) override

virtual void	setNotifyAudioChange (AudioInfoSupport &bi) override

void	setStepSize (float step)
	influence the sample rate

virtual void	setStream (Print &print)

virtual void	setStream (Stream &stream)

void	setupReader ()

virtual bool	validate (AudioInfo &info)

size_t	write (const uint8_t *buffer, size_t bytes) 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)

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

void	refillReadBuffer ()

void	setupLastSamples (AudioInfo cfg)
	Sets up the buffer for the rollover samples.

template<typename T >
void	setupLastSamples (T *data, int frame)

template<typename T >
size_t	write (Print p_out, const uint8_t buffer, size_t bytes, size_t &written)
	Writes the buffer to p_print after resampling.

Protected Attributes
int	bytes_per_frame = 0

float	factor

float	idx = 0

AudioInfo	info

bool	is_first = true

Vector< uint8_t >	last_samples {0}

AudioInfoSupport *	p_notify =nullptr

Print *	p_print = nullptr

Stream *	p_stream = nullptr

TransformationReader< ResampleStream >	reader

float	step_size = 1.0

RingBuffer< uint8_t >	tmp_in {0}

RingBuffer< uint8_t >	tmp_out {0}

int	to_sample_rate = 0

Detailed Description

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

Template Parameters

T

Constructor & Destructor Documentation

ResampleStream ( AudioOutput & out )

inline

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

ResampleStream ( AudioStream & io )

inline

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

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

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