v4l2_stats.cpp File Reference

Helper class to handle an ISP statistics buffer compatible with the generic V4L2 ISP format. More...

#include "v4l2_stats.h"
#include <libcamera/base/log.h>

Include dependency graph for v4l2_stats.cpp:

Namespaces
namespace	libcamera
	Top-level libcamera namespace.
namespace	libcamera::ipa
	The IPA (Image Processing Algorithm) namespace.

Detailed Description

Helper class to handle an ISP statistics buffer compatible with the generic V4L2 ISP format.

The Linux kernel defines a generic buffer format for ISP statistics. The format describes a serialisation method that allows userspace to access statistics data from a binary buffer.

The V4L2Stats class implements support for the V4L2 ISP statistics buffer format and allows users to retrieve an ISP statistics block.

IPA implementations using these helpers should define an enumeration of ISP blocks supported by the IPA module and use a set of common abstractions to help their derived implementation of V4L2Stats translate the enumerated ISP block identifiers to the actual type of the statistics data as defined by the kernel interface.