NBuffer< T > Class Template Reference

A lock free N buffer. If count=2 we create a DoubleBuffer, if count=3 a TripleBuffer etc. More...

#include <Buffers.h>

Inheritance diagram for NBuffer< T >:

Public Member Functions
	NBuffer (int size, int count)
T *	address ()
	returns the address of the start of the phsical read buffer
int	available ()
	determines the available entries for the current read buffer
int	availableForWrite ()
	determines the available entries for the write buffer
virtual int	bufferCountEmpty ()
	Provides the number of entries that are available to write.
virtual int	bufferCountFilled ()
	Provides the number of entries that are available to read.
void	clear ()
	same as reset
virtual int	clearArray (int len)
	Removes the next len entries.
bool	isEmpty ()
bool	isFull ()
	checks if the buffer is full
virtual float	levelPercent ()
	Returns the level of the buffer in %.
bool	peek (T &result) override
	peeks the actual entry from the buffer
bool	read (T &result) override
	reads an entry from the buffer
virtual int	readArray (T data[], int len)
	reads multiple values
void	reset ()
	resets all buffers
virtual bool	resize (int bytes)
	Resizes the buffer if supported: returns false if not supported.
virtual bool	resize (int size, int count)
	Resize the buffers by defining a new buffer size and buffer count.
unsigned long	sampleRate ()
	provides the actual sample rate
size_t	size ()
	Provides the total capacity (=buffer size * buffer count)
bool	write (T data)
	write add an entry to the buffer
virtual int	writeArray (const T data[], int len)
	Fills the buffer data.
virtual int	writeArrayOverwrite (const T data[], int len)
	Fills the buffer data and overwrites the oldest data if the buffer is full.

Protected Member Functions
	NBuffer ()=default
	empty constructor only allowed by subclass
virtual bool	addAvailableBuffer (BaseBuffer< T > *buffer)
virtual bool	addFilledBuffer (BaseBuffer< T > *buffer)
void	freeMemory ()
virtual BaseBuffer< T > *	getNextAvailableBuffer ()
virtual BaseBuffer< T > *	getNextFilledBuffer ()
void	resetCurrent ()

Protected Attributes
BaseBuffer< T > *	actual_read_buffer = nullptr
BaseBuffer< T > *	actual_write_buffer = nullptr
QueueFromVector< BaseBuffer< T > * >	available_buffers {0, nullptr}
uint16_t	buffer_count = 0
int	buffer_size = 1024
QueueFromVector< BaseBuffer< T > * >	filled_buffers {0, nullptr}
unsigned long	sample_count = 0
unsigned long	start_time = 0

Detailed Description

template<typename T = int16_t>
class audio_tools::NBuffer< T >

A lock free N buffer. If count=2 we create a DoubleBuffer, if count=3 a TripleBuffer etc.

Author

Phil Schatzmann

Copyright

GPLv3

Member Function Documentation

address()

template<typename T = int16_t>

T * address ( )

inlinevirtual

returns the address of the start of the phsical read buffer

Implements BaseBuffer< T >.

available()

template<typename T = int16_t>

int available ( )

inlinevirtual

determines the available entries for the current read buffer

Implements BaseBuffer< T >.

availableForWrite()

template<typename T = int16_t>

int availableForWrite ( )

inlinevirtual

determines the available entries for the write buffer

Implements BaseBuffer< T >.

bufferCountEmpty()

template<typename T = int16_t>

virtual int bufferCountEmpty ( )

inlinevirtual

Provides the number of entries that are available to write.

Reimplemented in SynchronizedNBufferRTOST< T >.

bufferCountFilled()

template<typename T = int16_t>

virtual int bufferCountFilled ( )

inlinevirtual

Provides the number of entries that are available to read.

Reimplemented in SynchronizedNBufferRTOST< T >.

clearArray()

template<typename T = int16_t>

virtual int clearArray ( int  len )

inlinevirtualinherited

Removes the next len entries.

Reimplemented in SingleBuffer< T >, SingleBuffer< float >, SingleBuffer< int16_t >, SingleBuffer< int32_t >, SingleBuffer< stsz_sample_size_t >, SingleBuffer< T >, SingleBuffer< uint32_t >, and SingleBuffer< uint8_t >.

isFull()

template<typename T = int16_t>

bool isFull ( )

inlinevirtual

checks if the buffer is full

Reimplemented from BaseBuffer< T >.

peek()

template<typename T = int16_t>

bool peek ( T &  result )

inlineoverridevirtual

peeks the actual entry from the buffer

Implements BaseBuffer< T >.

read()

template<typename T = int16_t>

bool read ( T &  result )

inlineoverridevirtual

reads an entry from the buffer

Implements BaseBuffer< T >.

readArray()

template<typename T = int16_t>

virtual int readArray ( T  data[], int  len  )

inlinevirtualinherited

reads multiple values

Reimplemented in RingBufferFile< File, T >, BufferRTOS< T >, SynchronizedBuffer< T >, RedisBuffer< T >, BufferRP2040T< T >, NBufferFile< File, T >, and DynamicMultiBuffer< T, BufferType >.

reset()

template<typename T = int16_t>

void reset ( )

inlinevirtual

resets all buffers

Implements BaseBuffer< T >.

resize() [1/2]

template<typename T = int16_t>

virtual bool resize ( int  bytes )

inlinevirtual

Resizes the buffer if supported: returns false if not supported.

Reimplemented from BaseBuffer< T >.

resize() [2/2]

template<typename T = int16_t>

virtual bool resize ( int  size, int  count  )

inlinevirtual

Resize the buffers by defining a new buffer size and buffer count.

Reimplemented in SynchronizedNBufferRTOST< T >.

size()

template<typename T = int16_t>

size_t size ( )

inlinevirtual

Provides the total capacity (=buffer size * buffer count)

Implements BaseBuffer< T >.

Reimplemented in SynchronizedNBufferRTOST< T >.

write()

template<typename T = int16_t>

bool write ( T  data )

inlinevirtual

write add an entry to the buffer

Implements BaseBuffer< T >.

writeArray()

template<typename T = int16_t>

virtual int writeArray ( const T  data[], int  len  )

inlinevirtualinherited

Fills the buffer data.

Reimplemented in BufferRTOS< T >, SynchronizedBuffer< T >, RedisBuffer< T >, BufferRP2040T< T >, SingleBuffer< T >, SingleBuffer< T >, RingBufferFile< File, T >, NBufferFile< File, T >, and DynamicMultiBuffer< T, BufferType >.

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

• src/AudioTools/CoreAudio/Buffers.h