| .. 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 |
