2.13.3. V4L2_META_FMT_RK_ISP1_PARAMS (‘rk1p’), V4L2_META_FMT_RK_ISP1_STAT_3A (‘rk1s’)¶
2.13.3.1. Configuration parameters¶
The configuration parameters are passed to the
rkisp1_params metadata output video node, using
the v4l2_meta_format
interface. The buffer contains
a single instance of the C structure rkisp1_params_cfg
defined in
rkisp1-config.h
. So the structure can be obtained from the buffer by:
struct rkisp1_params_cfg *params = (struct rkisp1_params_cfg*) buffer;
2.13.3.2. 3A and histogram statistics¶
The ISP1 device collects different statistics over an input Bayer frame.
Those statistics are obtained from the rkisp1_stats
metadata capture video node,
using the v4l2_meta_format
interface. The buffer contains a single
instance of the C structure rkisp1_stat_buffer
defined in
rkisp1-config.h
. So the structure can be obtained from the buffer by:
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 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.
2.13.3.3. rkisp1 uAPI data types¶
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