FrameFifo Class Reference

A thread-safe combination of a fifo (first-in-first-out) queue and an associated stack. More...

#include <framefifo.h>

Inheritance diagram for FrameFifo:

Collaboration diagram for FrameFifo:

Public Member Functions
	FrameFifo (const char *name, FrameFifoContext ctx=FrameFifoContext())
	Default ctor
virtual	~FrameFifo ()
	Default virtual dtor
	ban_copy_ctor (FrameFifo)
	ban_copy_asm (FrameFifo)
virtual bool	writeCopy (Frame *f, bool wait=false)
	Take a frame "ftmp" from the stack, copy contents of "f" into "ftmp" and insert "ftmp" into the beginning of the fifo (i.e. perform "copy-on-insert"). The size of "ftmp" is also checked and set to target_size, if necessary. If wait is set to true, will wait until there are frames available in the stack. More...
virtual Frame *	read (unsigned short int mstimeout=0)
	Pop a frame from the end of the fifo when available.
virtual void	recycle (Frame *f)
	Like FrameFifo::recycle_ but with mutex protection.
virtual void	recycleAll ()
	Recycle all frames from fifo back to stack (make a "flush")
virtual void	dumpStacks ()
	Dump frames in the stacks.
virtual void	dumpFifo ()
	Dump frames in the fifo.
virtual void	diagnosis ()
	Print a resumen of fifo and stack usage.
bool	isEmpty ()
	Tell if fifo is empty.

Protected Member Functions
virtual void	recycle_ (Frame *f)
	Return Frame f back into the stack. Update target_size if necessary.
virtual void	recycleAll_ ()
	Recycle all frames back to the stack.

Protected Attributes
std::string	name
FrameFifoContext	ctx
	Parameters defining the stack and overflow behaviour.
std::map< FrameClass, Reservoir >	reservoirs
	The actual frames.
std::map< FrameClass, Stack >	stacks
	Pointers to the actual frames, sorted by FrameClass.
Fifo	fifo
	The fifo queue.
std::mutex	mutex
	The Lock.
std::condition_variable	condition
	The Event/Flag.
std::condition_variable	ready_condition
	The Event/Flag for FrameFifo::ready_mutex.

Detailed Description

A thread-safe combination of a fifo (first-in-first-out) queue and an associated stack.

Frame instances are placed into FrameFifo with FrameFifo::writeCopy that draws a Frame from the stack and performs a copy of the frame.

If no frames are available, an "overflow" occurs. The behaviour at overflow event can be defined (see FrameFifoContext).

When Frame has been used, it should be returned to the FrameFifo by calling FrameFifo::recycle. This returns the Frame to the stack.

Member Function Documentation

writeCopy()

bool FrameFifo::writeCopy ( Frame *  f, bool  wait = false  )

virtual

Take a frame "ftmp" from the stack, copy contents of "f" into "ftmp" and insert "ftmp" into the beginning of the fifo (i.e. perform "copy-on-insert"). The size of "ftmp" is also checked and set to target_size, if necessary. If wait is set to true, will wait until there are frames available in the stack.

Reimplemented in FDFrameFifo, OpenGLFrameFifo, RGBFrameFifo, and LiveFifo.

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

• /home/sampsa/C/valkka/include/framefifo.h
• /home/sampsa/C/valkka/src/framefifo.cpp