libcamera::V4L2Request Class Reference

V4L2Request object and API. More...

Inheritance diagram for libcamera::V4L2Request:

Collaboration diagram for libcamera::V4L2Request:

Public Member Functions
bool	isValid () const
	Check if the request is valid.
int	fd () const
	Get the file descriptor.
int	reinit ()
	Reinit the request.
int	queue ()
	Queue the request.
	V4L2Request (UniqueFD &&fd)
	Construct a V4L2Request.

Public Attributes
Signal< V4L2Request * >	requestDone
	Signal that is emitted when the request is done.

Additional Inherited Members
Protected Member Functions inherited from libcamera::Loggable
LogMessage	_log (const LogCategory &category, LogSeverity severity, const char *fileName=__builtin_FILE(), unsigned int line=__builtin_LINE()) const
	Create a temporary LogMessage object to log a message.

Detailed Description

V4L2Request object and API.

The V4L2Request class wraps a V4L2 request fd and provides some convenience functions to handle request.

It is usually constructed by calling MediaDevice::allocateRequests().

A request can then be passed to the V4L2Device::setControls(), V4L2Device::getControls() and V4L2VideoDevice::queueBuffer().

Constructor & Destructor Documentation

V4L2Request()

libcamera::V4L2Request::V4L2Request

(

UniqueFD &&

fd

)

Construct a V4L2Request.

Parameters

[in]

fd

The request fd

Member Function Documentation

fd()

int libcamera::V4L2Request::fd ( ) const

inline

Get the file descriptor.

Returns

The file descriptor wrapped by this V4L2Request

isValid()

bool libcamera::V4L2Request::isValid ( ) const

inline

Check if the request is valid.

Checks if the underlying fd is valid.

Returns

True if the request is valid, false otherwise

queue()

int libcamera::V4L2Request::queue

(

)

Queue the request.

Calls MEDIA_REQUEST_IOC_QUEUE on the request fd.

Returns

0 on success or a negative error code otherwise

reinit()

int libcamera::V4L2Request::reinit

(

)

Reinit the request.

Calls MEDIA_REQUEST_IOC_REINIT on the request fd.

Returns

0 on success or a negative error code otherwise

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

• include/libcamera/internal/v4l2_request.h
• src/libcamera/v4l2_request.cpp