BufferBlocking< T > Class Template Reference

Buffer implementation which provides the same blocking, thread-safe semantics as BufferRTOS (ESP32/STM32) and BufferZephyr, for platforms that have no native blocking stream buffer primitive - built on a SpinLock-protected RingBuffer plus a delay(1) polling wait loop. More...

#include <BufferBlocking.h>

Inheritance diagram for BufferBlocking< T >:

Public Member Functions
	BufferBlocking (size_t streamBufferSize, size_t xTriggerLevel=1, TickType_t writeMaxWait=UINT32_MAX, TickType_t readMaxWait=UINT32_MAX, Allocator &allocator=DefaultAllocator)
T *	address () override
	returns the address of the start of the physical read buffer
int	available () override
	provides the number of entries that are available to read
int	availableForWrite () override
	provides the number of entries that are available to write
virtual int	bufferCountEmpty ()
	Provides the number of entries that are available to write: -1 does not apply.
virtual int	bufferCountFilled ()
	Provides the number of entries that are available to read: -1 does not apply.
void	clear ()
	same as reset
virtual int	clearArray (int len)
	Removes the next len entries.
virtual void	flush ()
virtual float	freePercent ()
	Returns the free space of the buffer in %.
bool	isEmpty ()
bool	isFull () override
	checks if the buffer is full
virtual float	levelPercent ()
	Returns the level of the buffer in %.
	operator bool ()
bool	peek (T &result) override
	peeks the actual entry from the buffer
bool	read (T &result) override
	reads a single value
int	readArray (T data[], int len)
	reads multiple values
void	reset () override
	clears the buffer
bool	resize (size_t size)
	Re-Allocates the memory of the ring buffer.
virtual bool	resize (size_t size, int count)
	Resize the buffer by indicating the size and count (allocated bytes = size * count)
void	setReadFromISR (bool active)
void	setReadMaxWait (TickType_t ticks)
void	setWriteFromISR (bool active)
void	setWriteMaxWait (TickType_t ticks)
size_t	size ()
bool	write (T data) override
	write add an entry to the buffer
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
bool	isTimeLeft (uint32_t start, TickType_t maxWait)

Protected Attributes
RingBuffer< T >	buffer
SpinLock	mutex
TickType_t	readWait = UINT32_MAX
TickType_t	writeWait = UINT32_MAX

Detailed Description

template<typename T>
class audio_tools::BufferBlocking< T >

Buffer implementation which provides the same blocking, thread-safe semantics as BufferRTOS (ESP32/STM32) and BufferZephyr, for platforms that have no native blocking stream buffer primitive - built on a SpinLock-protected RingBuffer plus a delay(1) polling wait loop.

Note

Supported on any platform providing MutexBase, delay() and millis() (e.g. Desktop, RP2040 without FreeRTOS)

Author

Phil Schatzmann

Copyright

GPLv3

Template Parameters

T

Constructor & Destructor Documentation

BufferBlocking()

template<typename T >

BufferBlocking ( size_t  streamBufferSize, size_t  xTriggerLevel = 1, TickType_t  writeMaxWait = UINT32_MAX, TickType_t  readMaxWait = UINT32_MAX, Allocator &  allocator = DefaultAllocator  )

inline

Member Function Documentation

address()

template<typename T >

T * address ( )

inlineoverridevirtual

returns the address of the start of the physical read buffer

Implements BaseBuffer< T >.

available()

template<typename T >

int available ( )

inlineoverridevirtual

provides the number of entries that are available to read

Implements BaseBuffer< T >.

availableForWrite()

template<typename T >

int availableForWrite ( )

inlineoverridevirtual

provides the number of entries that are available to write

Implements BaseBuffer< T >.

bufferCountEmpty()

virtual int bufferCountEmpty ( )

inlinevirtualinherited

Provides the number of entries that are available to write: -1 does not apply.

Reimplemented in SynchronizedNBufferRTOST< T >, SynchronizedNBufferZephyrT< T >, and NBuffer< T >.

bufferCountFilled()

virtual int bufferCountFilled ( )

inlinevirtualinherited

Provides the number of entries that are available to read: -1 does not apply.

Reimplemented in SynchronizedNBufferRTOST< T >, SynchronizedNBufferZephyrT< T >, and NBuffer< T >.

clear()

void clear ( )

inlineinherited

same as reset

clearArray()

virtual int clearArray ( int  len )

inlinevirtualinherited

Removes the next len entries.

Reimplemented in SingleBuffer< T >.

flush()

virtual void flush ( )

inlinevirtualinherited

Submit any partially-filled write buffer so the reader can access it. Only meaningful for NBuffer-style block pools; no-op for ring buffers.

Reimplemented in NBuffer< T >.

freePercent()

virtual float freePercent ( )

inlinevirtualinherited

Returns the free space of the buffer in %.

isEmpty()

template<typename T >

bool isEmpty ( )

inline

isFull()

template<typename T >

bool isFull ( )

inlineoverridevirtual

checks if the buffer is full

Reimplemented from BaseBuffer< T >.

isTimeLeft()

template<typename T >

bool isTimeLeft ( uint32_t  start, TickType_t  maxWait  )

inlineprotected

levelPercent()

virtual float levelPercent ( )

inlinevirtualinherited

Returns the level of the buffer in %.

operator bool()

template<typename T >

operator bool ( )

inline

peek()

template<typename T >

bool peek ( T &  result )

inlineoverridevirtual

peeks the actual entry from the buffer

Implements BaseBuffer< T >.

read()

template<typename T >

bool read ( T &  result )

inlineoverridevirtual

reads a single value

Implements BaseBuffer< T >.

readArray()

template<typename T >

int readArray ( T  data[], int  len  )

inlinevirtual

reads multiple values

Reimplemented from BaseBuffer< T >.

reset()

template<typename T >

void reset ( )

inlineoverridevirtual

clears the buffer

Implements BaseBuffer< T >.

resize() [1/2]

template<typename T >

bool resize ( size_t  size )

inlinevirtual

Re-Allocates the memory of the ring buffer.

Reimplemented from BaseBuffer< T >.

resize() [2/2]

virtual bool resize ( size_t  size, int  count  )

inlinevirtualinherited

Resize the buffer by indicating the size and count (allocated bytes = size * count)

Reimplemented in SynchronizedNBufferRTOST< T >, SynchronizedNBufferZephyrT< T >, and NBuffer< T >.

setReadFromISR()

template<typename T >

void setReadFromISR ( bool  active )

inline

setReadMaxWait()

template<typename T >

void setReadMaxWait ( TickType_t  ticks )

inline

setWriteFromISR()

template<typename T >

void setWriteFromISR ( bool  active )

inline

setWriteMaxWait()

template<typename T >

void setWriteMaxWait ( TickType_t  ticks )

inline

size()

template<typename T >

size_t size ( )

inlinevirtual

Implements BaseBuffer< T >.

write()

template<typename T >

bool write ( T  data )

inlineoverridevirtual

write add an entry to the buffer

Implements BaseBuffer< T >.

writeArray()

template<typename T >

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

inlinevirtual

Fills the buffer data.

Reimplemented from BaseBuffer< T >.

writeArrayOverwrite()

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

inlinevirtualinherited

Fills the buffer data and overwrites the oldest data if the buffer is full.

Member Data Documentation

buffer

template<typename T >

RingBuffer<T> buffer

protected

mutex

template<typename T >

SpinLock mutex

protected

readWait

template<typename T >

TickType_t readWait = UINT32_MAX

protected

writeWait

template<typename T >

TickType_t writeWait = UINT32_MAX

protected

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

• src/AudioTools/Concurrency/BufferBlocking.h