exposes the V4L2 API to set parameters on a capture device. More...

#include <v4lcontrol.h>

Collaboration diagram for CVD::V4LControl:

Public Member Functions
	V4LControl (int fd, bool report=true)

	V4LControl (const std::string &name, bool report=true)

int	getFile (void) const
	return file descriptor for the opened device

const std::string &	getDevice (void) const
	return file name of the opened device

void	setReportErrors (bool report)
	set error reporting

bool	getReportErrors (void) const

HighLevel
High level interface to set specific parameters without much hassle. These might fail if the parameter is not supported by the device and do not throw exceptions. Moreover ranges of parameter values are abstracted to lie within the intervall [0,1]. If you want to have more control, use the lower level interface described in Generic .
void	exposure (int)

int	exposure (void)

void	autoexposure (bool)

bool	autoexposure ()

void	gain (double)

double	gain (void)

void	autogain (bool)

bool	autogain (void)

void	brightness (double)

double	brightness (void)

void	contrast (double)

double	contrast (void)

void	saturation (double)

double	saturation (void)

Generic
generic high level interface abstracting the v4l2 structs
unsigned int	getId (const std::string &name) const

std::string	getName (unsigned int id) const

std::vector< unsigned int >	supportedParameters (void) const

std::vector< std::string >	supportedParameterNames (void) const

bool	isSupported (const std::string &name) const

void	set (const std::string &name, int value)

int	get (const std::string &name)

int	type (const std::string &name)

std::map< unsigned int, std::string >	menuValues (const std::string &name)

int	defaultValue (const std::string &name)

int	min (const std::string &name)

int	max (const std::string &name)

int	step (const std::string &name)

bool	isSupported (unsigned int id) const

void	set (unsigned int id, int value)

int	get (unsigned int id)

int	type (unsigned int id)

std::map< unsigned int, std::string >	menuValues (unsigned int id) const

int	defaultValue (unsigned int id) const

int	min (unsigned int id) const

int	max (unsigned int id) const

int	step (unsigned int id) const

LowLevel
low level interface using v4l2 structs
int	getQueryStruct (v4l2_queryctrl &query) const

void	getMenuStruct (unsigned int id, std::vector< v4l2_querymenu > &menu) const

int	setControlStruct (v4l2_control &value)

int	getControlStruct (v4l2_control &value) const

Protected Member Functions
void	queryControls (void)

Protected Attributes
int	device

std::string	deviceName

struct v4l2_control	control

bool	reportErrors

std::map< std::string, unsigned int >	controlNames

std::map< unsigned int, v4l2_queryctrl >	controlData

std::map< unsigned int, std::vector< v4l2_querymenu > >	menuData

Detailed Description

exposes the V4L2 API to set parameters on a capture device.

It can be used in parallel to a v4lbuffer object to control and query all parameters supported. Several abstraction levels are supported. On the highest there are individual member functions for various fixed parameters. The next level supports querying and setting/getting values for all parameters supported by the driver. Finally, low-level access using V4L2 structs is supported as well.

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

cvd/Linux/v4lcontrol.h
cvd_src/Linux/v4lcontrol.cc

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description