Inheritance diagram for libcamera::ipa::V4L2ParamsBase:

Public Member Functions
size_t	bytesused () const
	Retrieve the used size of the parameters buffer (in bytes)

Protected Member Functions
	V4L2ParamsBase (Span< uint8_t > data, unsigned int version)
	Construct an instance of V4L2ParamsBase.

Span< uint8_t >	block (uint16_t type, unsigned int blockType, size_t blockSize)
	Populate an ISP configuration block a returns a reference to its memory.

Protected Attributes
Span< uint8_t >	data_
	The ISP parameters buffer memory.

size_t	used_
	The number of bytes used in the parameters buffer.

std::map< uint16_t, Span< uint8_t > >	blocks_
	Cache of ISP configuration blocks.

Detailed Description

Base class for V4L2Params.

The V4L2ParamsBase is an integral part of V4L2Params. It serves as a container for all code that does not depend on the V4L2Params template arguments, to avoid duplicate copies of inline code.

Constructor & Destructor Documentation

◆ V4L2ParamsBase()

libcamera::ipa::V4L2ParamsBase::V4L2ParamsBase	(	Span< uint8_t >	data,
		unsigned int	version
	)

protected

Construct an instance of V4L2ParamsBase.

Parameters

[in]	data	Reference to the v4l2-buffer memory mapped area
[in]	version	The ISP parameters version the implementation supports

Member Function Documentation

◆ block()

Span< uint8_t > libcamera::ipa::V4L2ParamsBase::block	(	uint16_t	type,
		unsigned int	blockType,
		size_t	blockSize
	)

protected

Populate an ISP configuration block a returns a reference to its memory.

Parameters

[in]	type	The ISP block identifier enumerated by the IPA module
[in]	blockType	The kernel-defined ISP block identifier, used to populate the block header
[in]	blockSize	The ISP block size, used to populate the block header

Initialize the block header with blockType and blockSize and returns a reference to the memory used to store an ISP configuration block.

IPA modules that derive the V4L2Params class shall use this function to retrieve the memory area that will be used to construct a V4L2ParamsBlock<T> before returning it to the caller.

◆ bytesused()

libcamera::ipa::V4L2ParamsBase::bytesused ( ) const

inline

Retrieve the used size of the parameters buffer (in bytes)

The parameters buffer size is mostly used to populate the v4l2_buffer bytesused field before queueing the buffer to the ISP.

Returns: The number of bytes occupied by the ISP configuration parameters

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

src/ipa/libipa/v4l2_params.h
src/ipa/libipa/v4l2_params.cpp

Public Member Functions