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Software Engineer at Opinsys Oy
Entrepreneur at Siltakatu Solutions Oy

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jarkko

Jarkko Sakkinen

Not forgotten and not discontinued:

https://github.com/umlaeute/v4l2loopback/issues/268#issuecomment-2541605102

Just a slow process and busy at work before holidays ;-)

This is pretty typical for OOT drivers really. Bad architecture choices kind of accumulate because no one dares to make any actual changes to what is already there.

Probably would happen to me too if I was doing OOT so not blaming anyone, just saying how it is ;-)

#linux #kernel #video4linux
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jarkko

Jarkko Sakkinen

Pro-Q4! #FabFilter
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jarkko

Jarkko Sakkinen

Reply to @jarkko
... and IRC is obviously for the Gods of Internet ;-)
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jarkko

Jarkko Sakkinen

IM's:

1. Signal: great for professional communications.
2. WhatsApp: great for being in touch with your mom.
3. Telegram and AWS Wickr: great for criminal activity and dealing drugs.
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jarkko

Jarkko Sakkinen

I wonder does SDL3 have anything like baseview [1] for writing plugin UI's?

[1] https://github.com/RustAudio/baseview
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jarkko

Jarkko Sakkinen

Three months in a company after this month. Three PR's in that time. The last one is almost finished: https://github.com/paritytech/polkadot-sdk/pull/6533

Could have performed better but at least all wen right and RISC-V based smart contract moved from PoC to experimental feature in the SDK.

After #6533 next up is to further refine DWARF parser in the PolkaVM.

People have different feelings and thoughts on blockchains but I do enjoy the most is that the whole ecosystem is so unfinished :-) Lot's of cool stuff is still waiting for a trophy collector.

#blockchain #parity #polkadot
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jarkko

Jarkko Sakkinen

Nice write up about Deluxe Paint:

https://www.datagubbe.se/dpaint/

Also in the later years Deluxe Paint Animation on PC was cool.
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jarkko

Jarkko Sakkinen

Reply to @jarkko
QPU's are bit like GPU's. They perform a subset of computational problem really fast, i.e. they supplement on what we can do today with semiconductors (not repeal and replace).
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jarkko

Jarkko Sakkinen

Edited 3 months ago

https://blog.google/technology/research/google-willow-quantum-chip/

Willow performed a standard benchmark computation in under five minutes that would take one of today’s fastest supercomputers 10 septillion (that is, 10^25) years — a number that vastly exceeds the age of the Universe.

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jarkko

Jarkko Sakkinen

Reply to @jarkko
@johnbchron With other linkers Zed performs the best but launching e.g. Helix takes down the whole fucking GNOME session 🤷 And this has been going on for two months. Even buying 9950X based desktop did not cure the issue. I'm still happy that I got it because it does help with compiling Rust, which can be more heavy on CPU than e.g. compiling an operating system image with BuildRoot.
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jarkko

Jarkko Sakkinen

Reply to @johnbchron@social.treehouse.systems
@johnbchron Eating up too much memory and whole session freezing.

This happened with GNU ld (default), mold and wild. LLVM ld seems to be only that is kind of "steady performer". Just my experience but sticking to what works (for me)...
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jarkko

Jarkko Sakkinen

I was wondering why rust-analyzer does random hickups and switching to lld finally fixed it. The choice of linker inherits from matching Rust environment of macOS, which does use LLVM ld, and never experienced similar glitches. This even happened sometimes with 9950X desktop.

So for any Rust installation in Linux I'd first and foremost always add this to .cargo/config.toml before anything else:

[target.x86_64-unknown-linux-gnu]
linker = "clang"
rustflags = ["-C", "link-arg=-fuse-ld=/usr/bin/lld"]

Installation:

1. In Fedora: dnf install lld
2. In Debian: apt install lld

AFAIK, by de-facto it probably uses GNU ld, and also some flashier newer ones do not provide glitch-free result with rust-analyzer (i.e. mold and wild).

#rust #llvm
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jarkko

Jarkko Sakkinen

Hmm... I get weird subprogram names from DWARF with RV32E/RV64E on RISC-V rustc.
Or like, each have the exact same symbol name o_O.

#rust #rustlang #riscv
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jarkko

Jarkko Sakkinen

Reply to @jarkko
@Linux @ikkeT Bisneksessä Linux kanssa pitäisi ajatella niitä B2B voluuminmyynti-opportunityja, tai niiden enablointia, ei mitään random käyttäjän deskareita.
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jarkko

Jarkko Sakkinen

Takes some time to get a test for my "FUSE camera driver" right (it's like in ~65% done til RFC) but one additional application that came to mind for it would be provide camera access for Wine ("winecamera"). So that you could use Windows applications, which require camera access.

#linux #video4linux #wine #windows
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jarkko

Jarkko Sakkinen

Reply to @jarkko
@Linux @ikkeT Mä ainakin käyttäisin appeihin ennemmin mun Mac Miniä, jos valokuvaisi. Joka alustalla kannattaisi miettiä ennemmin, missä raha tehdään kuin miten haaskataan yrityksen rahoja kaatopaikkajätteeseen.
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jarkko

Jarkko Sakkinen

Reply to @jarkko
@ikkeT @Linux Kehittäjätarinoissa ennemmin kannattaisi miettiä, että mitä jos jostain syystä joku haluaisi kehittää SaaS:n, mitä varten pitäisi hankkia 10 000 Canonin kameraa, ja niitä hyödyntävä alusta pyörisi pilvessä Kubernetesin päällä. Ei ole hirveästi mietitty, miten työ muuttuu kasvuksi, vaan tehdään jotain täysin turhaa kaikille käyttäjäkategorioille.
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jarkko

Jarkko Sakkinen

Reply to @ikkeT@mementomori.social
@ikkeT @Linux Mun mielestä tässä on ehkä ennemminkin ymmärretty mahdollisimman väärin mitä kehittäjät haluaa. Tämmöinen alustatalous toimi viimeksi 90-luvulla...
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jarkko

Jarkko Sakkinen

https://www.youtube.com/watch?v=-jKNrwBaCLs #finglish
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jarkko

Jarkko Sakkinen

Reply to @jarkko
Edited 3 months ago

Early, rudimentary and unpolished skeleton of a “server side”:

import ctypes
import fcntl
import os
import sys

V4L2_LOOPBACK_DEVICE_FILE = "/dev/v4l2loopback"

V4L2_LOOPBACK_MAGIC = 0x4C
V4L2_LOOPBACK_IOC_ADD = 0xC0004C00


class V4L2LoopbackAdd(ctypes.Structure):
    _fields_ = [
        ("card_label", ctypes.c_uint64),
        ("flags", ctypes.c_uint16),
        ("device_nr", ctypes.c_uint16),
        ("card_fd", ctypes.c_uint32),
    ]


def main():
    try:
        fd = os.open(V4L2_LOOPBACK_DEVICE_FILE, os.O_RDWR)
    except FileNotFoundError:
        sys.exit(1)

    loopback = V4L2LoopbackAdd()
    ctypes.memset(ctypes.addressof(loopback), 0, ctypes.sizeof(loopback))

    try:
        fcntl.ioctl(fd, V4L2_LOOPBACK_IOC_ADD, loopback)
        print(f"{loopback.device_nr} {loopback.card_fd}")
    except OSError:
        sys.exit(1)
    finally:
        os.close(fd)


if __name__ == "__main__":
    main()

Anyway shows the gist. The device name is due to change…

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