Hello!

I am Steinar, although online, many will know me as Sesse. After moving back and forth for a while, I now live in Oslo, in my home country of Norway. I currently work for Google, on the Chrome web browser, but during my previous Google employment, I also worked on projects such as IPv6, Snappy, Search by Image, Offline Maps, TensorFlow, and many more I cannot talk about. I've also worked in the MySQL optimizer team for Oracle, where I wrote the new executor in MySQL 8.0 as well as the upcoming new join optimizer. I sometimes take pictures, and I play ultimate.

Contact

You can reach me by:

• Email (preferred): steinar+web@gunderson.no
• IRC: Sesse, on EFNet, IRCNet, Libera and OFTC
• Signal: sesse.01 (no unsolicited calls, please)

Software

I happen to be quite good at changing patterns of lights, so I do that a lot. A lot of the code I write is made available, even the projects that are not very useful, or even completely unfinished. Most of them are just Git repositories, but some have things that look like web pages dedicated to them. The list of projects includes:

Video tech

• Movit, a library for high-quality, high-performance video filters (Libre Graphics World article).
• Nageru, a live video mixer.
• Futatabi, a multi-camera replay system.
• cubemap, a scalable video reflector, designed to be used together with VLC and/or Nageru.

Other popular

• mpm-itk, an Apache MPM for running different vhosts as different users.
• plocate, a much faster locate.
• pr0n, the code used for my image gallery.
• remoteglot, a program used to use a UCI compatible chess engine (such as Stockfish) to analyze chess games, including live online relay. Used for my live chess analysis website, seemingly just known as “Sesse” in the general public.

Misc.

• audiosync, a few quick programs to keep the recording from multiple sound cards in sync (using one channel per card for a sync pulse).
• BetaFTPD, a single-threaded, minimalistic FTP server.
• bursty, software to test packet loss behavior over the Internet.
• c64tapwav, a high-quality .wav generator from a C64 TAP file.
• ccbs, a tournament system for Dance Dance Revolution tournaments.
• fat-rescue, some snippets for rescuing files from a FAT file system with a broken FAT.
• fp-downconvert, C code for converting 64-bit IEEE 754 floating-point numbers to 16-bit floating-point numbers, including correct handling of rounding, infinities, denormals and NaN.
• greasemonkey-scripts, a few Greasemonkey scripts I find useful.
• GPUwave, an implementation of the split-step Fourier method (simulating underwater acoustics) for the GPU.
• hamming, a simple but relatively fast implementation of (16,11) and (32,26) extended Hamming codes in C.
• ITKACL, a simple but generic authorization system with bindings to many languages and systems.
• keycount, a daemon that counts your keystrokes in the background.
• mbd, a daemon for relaying broadcast packets for popular games across multiple network segments, (ab)using directed multicast and helper functionality usually meant for DHCP.
• pitch, my FFT-based guitar tuning program.
• qmfsplit, a moderate-complexity (O(n log n) in number of subbands, but higher constant factor than straight FFT), small-size (<2kB code with plenty of opportunity for optimization), low-latency, simplistic splitting filter based on quadrature mirror filters (QMF).
• qscale, a high-quality, high-speed image scaling library.
• rdpsrv, what was once supposed to be a server for Microsoft's Remote Desktop Protocol (or: how far you can get with a copy of rdesktop and a few days of frantic hacking).
• sigmoidsmooth, a simple program to fit a sigmoid curve to a set of data points, using the Ceres library.
• sproing, a very primitive but fun-to-watch solver for (possibly overconstrained) trilateration, triangulation and hybrid problems.
• stupid, a chess AI that lives up to its name.
• sudoku, a lightning-fast Sudoku solver.
• tcxmerge, software for finding the most likely route you took given a GPS track, pedometer/footpod data, and road information from OpenStreetMap, using the Ceres library.
• ts-ipv6, a binary patch adding IPv6 support to Tiberian Sun.
• tsp, a program for solving (possibly sparse) travelling salesman problems using memoization (good for up to about twenty cities).
• ttk-gettext, an interface between Template Toolkit and GNU Gettext, allowing for simple translation of web templates.
• webpdf, the source code for pdf.sesse.net.
• wloh, the source code for my Wordfeud rating system (wloh.sesse.net).
• xml-template, a completely logic-free, cross-language, well-formed-XML-outputting templating system.

Also, when I don't write software on my own, I tend to find things that is wrong in others'. I've lost track of all the patches a long time ago, but I have code in at least Android, autofs, bcachefs-tools, binutils, BusyBox, c-ares, CasparCG, cdpd, Cura, debian-installer, difftastic, dpkg, FFmpeg, Frei0r, GIMP, glibc, gpsd, grip, grpc, GStreamer, Hitch, Kdenlive, libusb, Linux, make, MediaWiki, Mesa, MLT, MPlayer, MuMuDVB, Net::RawIP, NeoMutt, nfs-utils, Request Tracker, rtorrent, Slashcode, StepMania, Stockfish, TLSe, VLC, typespeed, webalizer, wee-slack, WINE, and probably a lot of others that I forgot.

Publications

In reverse chronological order.

• Henrik Stewénius, Steinar H. Gunderson, Julien Pilet: Size Matters: Exhaustive Geometric Verification for Image Retrieval, European Conference on Computer Vision, 2012.
• Lorenzo Colitti, Steinar H. Gunderson, Erik Kline, Tiziana Refice: Evaluating IPv6 adoption in the Internet, Passive and Active Measurement Conference, 2010.
• Steinar H. Gunderson: Musical descriptors: An assessment of psychoacoustical models in the presence of lossy compression, master thesis, 2007.

Last update

This page was last updated January 2024.