libcamera::SwStatsCpu Class Reference

Class for gathering statistics on the CPU. More...

Collaboration diagram for libcamera::SwStatsCpu:

Public Member Functions
bool	isValid () const
	Gets whether the statistics object is valid.
const SharedFD &	getStatsFD ()
	Get the file descriptor for the statistics.
const Size &	patternSize ()
	Get the pattern size.
int	configure (const StreamConfiguration &inputCfg)
	Configure the statistics object for the passed in input format.
void	setWindow (const Rectangle &window)
	Specify window coordinates over which to gather statistics.
void	startFrame ()
	Reset state to start statistics gathering for a new frame.
void	finishFrame ()
	Finish statistics calculation for the current frame.
void	processLine0 (unsigned int y, const uint8_t *src[])
	Process line 0.
void	processLine2 (unsigned int y, const uint8_t *src[])
	Process line 2 and 3.

Public Attributes
Signal	statsReady
	Signals that the statistics are ready.

Detailed Description

Class for gathering statistics on the CPU.

CPU based software ISP statistics implementation.

This class offers a configure function + functions to gather statistics on a line by line basis. This allows CPU based software debayering to interleave debayering and statistics gathering on a line by line basis while the input data is still hot in the cache.

It is also possible to specify a window over which to gather statistics instead of processing the whole frame.

Member Function Documentation

configure()

int libcamera::SwStatsCpu::configure

(

const StreamConfiguration &

inputCfg

)

Configure the statistics object for the passed in input format.

Parameters

[in]

inputCfg

The input format

Returns

0 on success, a negative errno value on failure

finishFrame()

void libcamera::SwStatsCpu::finishFrame

(

void

)

Finish statistics calculation for the current frame.

This may only be called after a successful setWindow() call.

getStatsFD()

const SharedFD & libcamera::SwStatsCpu::getStatsFD ( )

inline

Get the file descriptor for the statistics.

Returns

The file descriptor

isValid()

bool libcamera::SwStatsCpu::isValid ( ) const

inline

Gets whether the statistics object is valid.

Returns

True if it's valid, false otherwise

patternSize()

const Size & libcamera::SwStatsCpu::patternSize ( )

inline

Get the pattern size.

For some input-formats, e.g. Bayer data, processing is done multiple lines and/or columns at a time. Get width and height at which the (bayer) pattern repeats. Window values are rounded down to a multiple of this and the height also indicates if processLine2() should be called or not. This may only be called after a successful configure() call.

Returns

The pattern size

processLine0()

void libcamera::SwStatsCpu::processLine0 ( unsigned int y, const uint8_t * src[] )

inline

Process line 0.

Parameters

[in]	y	The y coordinate.
[in]	src	The input data.

This function processes line 0 for input formats with patternSize height == 1. It'll process line 0 and 1 for input formats with patternSize height >= 2. This function may only be called after a successful setWindow() call.

processLine2()

void libcamera::SwStatsCpu::processLine2 ( unsigned int y, const uint8_t * src[] )

inline

Process line 2 and 3.

Parameters

[in]	y	The y coordinate.
[in]	src	The input data.

This function processes line 2 and 3 for input formats with patternSize height == 4. This function may only be called after a successful setWindow() call.

setWindow()

void libcamera::SwStatsCpu::setWindow

(

const Rectangle &

window

)

Specify window coordinates over which to gather statistics.

Parameters

[in]

window

The window object.

startFrame()

void libcamera::SwStatsCpu::startFrame

(

void

)

Reset state to start statistics gathering for a new frame.

This may only be called after a successful setWindow() call.

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

• src/libcamera/software_isp/swstats_cpu.h
• src/libcamera/software_isp/swstats_cpu.cpp