51 lines
1.8 KiB
ReStructuredText
51 lines
1.8 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0
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.. _v4l2-meta-fmt-rk-isp1-params:
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.. _v4l2-meta-fmt-rk-isp1-stat-3a:
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*****************************************************************************
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V4L2_META_FMT_RK_ISP1_PARAMS ('rk1p'), V4L2_META_FMT_RK_ISP1_STAT_3A ('rk1s')
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*****************************************************************************
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Configuration parameters
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========================
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The configuration parameters are passed to the
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:ref:`rkisp1_params <rkisp1_params>` metadata output video node, using
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the :c:type:`v4l2_meta_format` interface. The buffer contains
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a single instance of the C structure :c:type:`rkisp1_params_cfg` defined in
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``rkisp1-config.h``. So the structure can be obtained from the buffer by:
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.. code-block:: c
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struct rkisp1_params_cfg *params = (struct rkisp1_params_cfg*) buffer;
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.. rkisp1_stat_buffer
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3A and histogram statistics
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===========================
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The ISP1 device collects different statistics over an input Bayer frame.
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Those statistics are obtained from the :ref:`rkisp1_stats <rkisp1_stats>`
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metadata capture video node,
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using the :c:type:`v4l2_meta_format` interface. The buffer contains a single
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instance of the C structure :c:type:`rkisp1_stat_buffer` defined in
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``rkisp1-config.h``. So the structure can be obtained from the buffer by:
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.. code-block:: c
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struct rkisp1_stat_buffer *stats = (struct rkisp1_stat_buffer*) buffer;
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The statistics collected are Exposure, AWB (Auto-white balance), Histogram and
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AF (Auto-focus). See :c:type:`rkisp1_stat_buffer` for details of the statistics.
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The 3A statistics and configuration parameters described here are usually
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consumed and produced by dedicated user space libraries that comprise the
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important tuning tools using software control loop.
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rkisp1 uAPI data types
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======================
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.. kernel-doc:: include/uapi/linux/rkisp1-config.h
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