MemoryStream Class Reference

A simple Stream implementation which is backed by allocated memory. More...

#include <AudioStreams.h>

Inheritance diagram for MemoryStream:

Public Member Functions
	MemoryStream (const uint8_t *buffer, int buffer_size, bool isActive=true, MemoryType memoryType=FLASH_RAM)
	MemoryStream (int buffer_size, MemoryType memoryType)
	Constructor for alloction in RAM.
	MemoryStream (MemoryStream &&source)
	Move Constructor.
	MemoryStream (MemoryStream &source)
	Copy Constructor.
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 ()
virtual int	available () override
virtual int	availableForWrite () override
bool	begin () override
	resets the read pointer
bool	begin (AudioInfo info)
	Define some audio info and start the processing.
virtual void	clear (bool reset=false)
	clears the audio data: sets all values to 0
virtual void	clearNotifyAudioChange ()
	Deletes all change notify subscriptions.
virtual uint8_t *	data ()
	Provides access to the data array.
virtual void	end () override
virtual void	flush () override
bool	isNotifyActive ()
	Checks if the automatic AudioInfo update is active.
	operator bool () override
	Returns true if there is still some more data.
MemoryStream &	operator= (MemoryStream &other)
	copy assignement operator
virtual int	peek () override
virtual int	read () override
virtual 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.
virtual bool	resize (size_t size)
virtual void	setAudioInfo (AudioInfo newInfo) override
	Defines the input AudioInfo.
virtual void	setAvailable (size_t len)
	update the write_pos (e.g. when we used data() to update the array)
virtual void	setLoop (bool loop)
virtual void	setLoop (bool loop, int rewindPos)
	Automatically rewinds to the indicated position when reaching the end.
void	setNotifyActive (bool flag)
	Deactivate/Reactivate automatic AudioInfo updates: (default is active)
void	setRewindCallback (void(*cb)())
	Callback which is executed when we rewind (in loop mode) to the beginning.
void	setValue (const uint8_t *buffer, int buffer_size, MemoryType memoryType=FLASH_RAM)
	Update the values (buffer and size)
virtual size_t	write (const uint8_t *data, size_t len) override
virtual size_t	write (uint8_t byte) override
virtual void	writeSilence (size_t len)
	Writes len bytes of silence (=0).

Protected Member Functions
void	copy (MemoryStream &source)
bool	memoryCanChange ()
virtual int	not_supported (int out, const char *msg="")
void	notifyAudioChange (AudioInfo info)
void	refillReadBuffer ()

Protected Attributes
int	_timeout = 10
uint8_t *	buffer = nullptr
int	buffer_size = 0
AudioInfo	info
bool	is_active = false
bool	is_loop = false
bool	is_notify_active = true
MemoryType	memory_type = RAM
Vector< AudioInfoSupport * >	notify_vector
int	read_pos = 0
void(*	rewind )() = nullptr
int	rewind_pos = 0
RingBuffer< uint8_t >	tmp_in {0}
RingBuffer< uint8_t >	tmp_out {0}
int	write_pos = 0

Detailed Description

A simple Stream implementation which is backed by allocated memory.

Author

Phil Schatzmann

Copyright

GPLv3

Constructor & Destructor Documentation

MemoryStream()

MemoryStream ( const uint8_t *  buffer, int  buffer_size, bool  isActive = true, MemoryType  memoryType = FLASH_RAM  )

inline

Constructor for data from Progmem, active is set to true automatically by default.

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

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.

available()

virtual int available ( )

inlineoverridevirtual

Reimplemented from BaseStream.

availableForWrite()

virtual int availableForWrite ( )

inlineoverridevirtual

Reimplemented from BaseStream.

begin()

bool begin ( )

inlineoverridevirtual

resets the read pointer

Reimplemented from BaseStream.

end()

virtual void end ( )

inlineoverridevirtual

Reimplemented from BaseStream.

flush()

virtual void flush ( )

inlineoverridevirtual

Reimplemented from BaseStream.

operator bool()

operator bool ( )

inlineoverridevirtual

Returns true if there is still some more data.

Reimplemented from AudioStream.

readBytes()

virtual size_t readBytes ( uint8_t *  data, size_t  len  )

inlineoverridevirtual

Reimplemented from AudioStream.

resize()

virtual bool resize ( size_t  size )

inlinevirtual

Resizes the available memory. Returns false for PROGMEM or when allocation failed

setAudioInfo()

virtual void setAudioInfo ( AudioInfo  info )

inlineoverridevirtualinherited

Defines the input AudioInfo.

Implements AudioInfoSupport.

Reimplemented in VS1053Stream, WM8960Stream, I2SBitBang, ChannelFormatConverterStreamT< T >, ChannelFormatConverterStream, VolumeStream, MiniAudioStream, PortAudioStream, I2SCodecStream, MozziStream, SPDIFOutput, AudioLoRa, AnalogAudioStream, I2SStream, MeasuringStream, VolumeMeter, TimerCallbackAudioStream, AudioBLEStream, LoRaStream, AudioFFTBase, AudioKitStream, VBANStream, AnalogAudioArduino, Equalizer3Bands, AdapterAudioOutputToAudioStream, TimedStream, ProgressStream, FormatConverterStream, FadeStream, Pipeline::ModifyingStreamAdapter, PureDataStream, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, NumberFormatConverterStreamT< TFrom, TTo >, NumberFormatConverterStream, Pipeline, and ResampleStream.

setLoop()

virtual void setLoop ( bool  loop )

inlinevirtual

Automatically rewinds to the beginning when reaching the end. For wav files we move to pos 44 to ignore the header!

write() [1/2]

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

inlineoverridevirtual

Reimplemented from AudioStream.

write() [2/2]

virtual size_t write ( uint8_t  byte )

inlineoverridevirtual

Reimplemented from BaseStream.

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

• src/AudioTools/CoreAudio/AudioStreams.h