.. SPDX-License-Identifier: GPL-2.0

.. _v4l2-meta-fmt-rk-isp1-params:

.. _v4l2-meta-fmt-rk-isp1-stat-3a:

V4L2_META_FMT_RK_ISP1_PARAMS ('rk1p'), V4L2_META_FMT_RK_ISP1_STAT_3A ('rk1s')

Configuration parameters

The configuration parameters are passed to the :ref:rkisp1_params <rkisp1_params> metadata output video node, using the :c:type:v4l2_meta_format interface. The buffer contains a single instance of the C structure :c:type:rkisp1_params_cfg defined in rkisp1-config.h. So the structure can be obtained from the buffer by:

.. code-block:: c

struct rkisp1_params_cfg *params = (struct rkisp1_params_cfg*) buffer;

.. rkisp1_stat_buffer

3A and histogram statistics

The ISP1 device collects different statistics over an input Bayer frame. Those statistics are obtained from the :ref:rkisp1_stats <rkisp1_stats> metadata capture video node, using the :c:type:v4l2_meta_format interface. The buffer contains a single instance of the C structure :c:type:rkisp1_stat_buffer defined in rkisp1-config.h. So the structure can be obtained from the buffer by:

.. code-block:: c

struct rkisp1_stat_buffer *stats = (struct rkisp1_stat_buffer*) buffer;

The statistics collected are Exposure, AWB (Auto-white balance), Histogram and AF (Auto-focus). See :c:type:rkisp1_stat_buffer for details of the statistics.

The 3A statistics and configuration parameters described here are usually consumed and produced by dedicated user space libraries that comprise the important tuning tools using software control loop.

rkisp1 uAPI data types

.. kernel-doc:: include/uapi/linux/rkisp1-config.h