[sys-base]
Consulting services from Paul Kocialkowski.
As a software development engineer, I offer consulting services for projects related to my areas of work.
Work is generally carried out remotely from Toulouse, France.
Feel free to reach out via email and start a discussion at: contact[at]sys-base.io.
I am open to discovering new topics so feel free to reach out anyway if your specific needs are not listed.
There is a number of specific topics that I would particularly like to work on. They are important milestones for hardware support in mainline free software projects. Feel free to contact me if you are interested in contracting services to achieve one of them.
I have made some notable contributions to hardware-oriented free software projects, which are good illustrations of the work I've been undertaking in the field.
Implemented H.264 encoding on top of the mainline cedrus driver with performance comparable to Allwinner's binary blobs. This required a new architecture for the driver and a proper rewrite. Wrote an associated userspace test tool.
Most features of the encoder were supported (I and P frames, QP setting) but no rate-control mechanism was implemented. Bitstream header generaton was implemented on the driver side. This work was not yet integrated in mainline Linux.
Author of the sun6i-isp driver for image sensor raw data processing with YUV capture, debayering and 2D noise filtering. This required a rewrite of the sun6i-csi driver. Many more features of the ISP were not implemented and the uAPI remains unfinished, causing the driver to stay in staging.
Author of the sun6i-mipi-csi2 and sun8i-a83t-mipi-csi2 V4L2 subdev drivers for MIPI CSI-2 capture, with support for Bayer raw formats. Added Rx mode support to the sun6i-mipi-dphy driver and added MIPI CSI-2 input support to the sun6i-csi driver.
Author of the ov5648 and ov8865 drivers, with proper code and logic (as opposed to large arrays of register values) to configure the clock tree and individual blocks of the sensors. Added support for multiple modes, operating points and possible Bayer raw formats in 8/10 bit.
Implemented H.264 encoding on top of the mainline verisilicon (hantro) driver with I and P frames support, bitstream reconstruction and limited rate-control done in userspace. Wrote an associated userspace test tool.
The uAPI remains very specific to the driver. This work was not yet integrated in mainline Linux.
Author of the logicvc-drm driver, which supports most features of the hardware (including overlays) and multiple versions of the block. Color-keying was implemented but not ready for mainline.
Initial author of the cedrus driver, added support for MPEG-2 and HEVC/H.265 decoding (with I, P and B frames) and enabled many Allwinner platforms. Added frontend tiled framebuffer support to the sun4i-drm driver. Author of a VA-API userspace implementation for V4L2 stateless decoding with support for H.265, H.264 and MPEG-2.
Worked on improving IGT GPU Tools test coverage with the Google Chamelium platform, including VGA output validation. Implemented HDMI audio testing with sine waves generation, playback and capture though ALSA and spectrum analysis.