82 lines
2.8 KiB
ReStructuredText
82 lines
2.8 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
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.. _v4l2-meta-fmt-params:
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.. _v4l2-meta-fmt-stat-3a:
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******************************************************************
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V4L2_META_FMT_IPU3_PARAMS ('ip3p'), V4L2_META_FMT_IPU3_3A ('ip3s')
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******************************************************************
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.. ipu3_uapi_stats_3a
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3A statistics
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=============
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The IPU3 ImgU 3A statistics accelerators collect different statistics over
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an input Bayer frame. Those statistics are obtained from the "ipu3-imgu [01] 3a
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stat" metadata capture video nodes, using the :c:type:`v4l2_meta_format`
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interface. They are formatted as described by the :c:type:`ipu3_uapi_stats_3a`
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structure.
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The statistics collected are AWB (Auto-white balance) RGBS (Red, Green, Blue and
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Saturation measure) cells, AWB filter response, AF (Auto-focus) filter response,
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and AE (Auto-exposure) histogram.
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The struct :c:type:`ipu3_uapi_4a_config` saves all configurable parameters.
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.. code-block:: c
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struct ipu3_uapi_stats_3a {
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struct ipu3_uapi_awb_raw_buffer awb_raw_buffer;
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struct ipu3_uapi_ae_raw_buffer_aligned ae_raw_buffer[IPU3_UAPI_MAX_STRIPES];
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struct ipu3_uapi_af_raw_buffer af_raw_buffer;
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struct ipu3_uapi_awb_fr_raw_buffer awb_fr_raw_buffer;
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struct ipu3_uapi_4a_config stats_4a_config;
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__u32 ae_join_buffers;
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__u8 padding[28];
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struct ipu3_uapi_stats_3a_bubble_info_per_stripe stats_3a_bubble_per_stripe;
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struct ipu3_uapi_ff_status stats_3a_status;
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};
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.. ipu3_uapi_params
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Pipeline parameters
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===================
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The pipeline parameters are passed to the "ipu3-imgu [01] parameters" metadata
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output video nodes, using the :c:type:`v4l2_meta_format` interface. They are
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formatted as described by the :c:type:`ipu3_uapi_params` structure.
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Both 3A statistics and pipeline parameters described here are closely tied to
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the underlying camera sub-system (CSS) APIs. They are usually consumed and
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produced by dedicated user space libraries that comprise the important tuning
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tools, thus freeing the developers from being bothered with the low level
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hardware and algorithm details.
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.. code-block:: c
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struct ipu3_uapi_params {
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/* Flags which of the settings below are to be applied */
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struct ipu3_uapi_flags use;
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/* Accelerator cluster parameters */
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struct ipu3_uapi_acc_param acc_param;
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/* ISP vector address space parameters */
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struct ipu3_uapi_isp_lin_vmem_params lin_vmem_params;
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struct ipu3_uapi_isp_tnr3_vmem_params tnr3_vmem_params;
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struct ipu3_uapi_isp_xnr3_vmem_params xnr3_vmem_params;
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/* ISP data memory (DMEM) parameters */
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struct ipu3_uapi_isp_tnr3_params tnr3_dmem_params;
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struct ipu3_uapi_isp_xnr3_params xnr3_dmem_params;
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/* Optical black level compensation */
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struct ipu3_uapi_obgrid_param obgrid_param;
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};
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Intel IPU3 ImgU uAPI data types
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===============================
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.. kernel-doc:: drivers/staging/media/ipu3/include/uapi/intel-ipu3.h
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