Inheritance diagram for libcamera::V4L2Request:

Collaboration diagram for libcamera::V4L2Request:

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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()

libcamera::V4L2Request::fd ( ) const

inline

Get the file descriptor.

Returns: The file descriptor wrapped by this V4L2Request

◆ isValid()

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

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

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

Public Member Functions

Public Attributes

Additional Inherited Members