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Per the Apple documentation, when 0 is returned from
IOSurfaceGetPixelFormat, the IOSurface is invalid. Prior to [1] however,
any invalid surfaces were (likely accidentally) treated as 32BGRA.
And as it turns out, any IOSurface received from Syphon does not have
the pixel format set, thus returning 0. Because the pixel format happens
to always be 32BGRA, this was never caught. [1] then slightly refactored
the code, fixing the bug not realizing it ever existed. This lead to
Syphon no longer working.
Treating 0 as 32BGRA appears to be the only way to fix this situation
for now and restore prior behavior. Ideally in the future Syphon
provides valid IOSurfaces. An upstream fix to Syphon-Framework is
already submitted, however even if merged, servers would need to update
to that fixed version before things work again. Therefore, this
workaround is needed on the OBS side.
However, the plan for now is for the Metal renderer to not get this
relaxation. It never had it (so Syphon never worked there, making this
not a regression) and it's marked as experimental. Hopefully, by the
time it's stable and/or default, Syphon will be fixed and servers have
been updated.
[1]: 53ad05db9f
OBS Studio <https://obsproject.com> =================================== .. image:: https://github.com/obsproject/obs-studio/actions/workflows/push.yaml/badge.svg?branch=master :alt: OBS Studio Build Status - GitHub Actions :target: https://github.com/obsproject/obs-studio/actions/workflows/push.yaml?query=branch%3Amaster .. image:: https://badges.crowdin.net/obs-studio/localized.svg :alt: OBS Studio Translation Project Progress :target: https://crowdin.com/project/obs-studio .. image:: https://img.shields.io/discord/348973006581923840.svg?label=&logo=discord&logoColor=ffffff&color=7389D8&labelColor=6A7EC2 :alt: OBS Studio Discord Server :target: https://obsproject.com/discord What is OBS Studio? ------------------- OBS Studio is software designed for capturing, compositing, encoding, recording, and streaming video content, efficiently. It's distributed under the GNU General Public License v2 (or any later version) - see the accompanying COPYING file for more details. Quick Links ----------- - Website: https://obsproject.com - Help/Documentation/Guides: https://github.com/obsproject/obs-studio/wiki - Forums: https://obsproject.com/forum/ - Build Instructions: https://github.com/obsproject/obs-studio/wiki/Install-Instructions - Developer/API Documentation: https://obsproject.com/docs - Donating/backing/sponsoring: https://obsproject.com/contribute - Bug Tracker: https://github.com/obsproject/obs-studio/issues Contributing ------------ - If you would like to help fund or sponsor the project, you can do so via `Patreon <https://www.patreon.com/obsproject>`_, `OpenCollective <https://opencollective.com/obsproject>`_, or `PayPal <https://www.paypal.me/obsproject>`_. See our `contribute page <https://obsproject.com/contribute>`_ for more information. - If you wish to contribute code to the project, please make sure to read the coding and commit guidelines: https://github.com/obsproject/obs-studio/blob/master/CONTRIBUTING.rst - Developer/API documentation can be found here: https://obsproject.com/docs - If you wish to contribute translations, do not submit pull requests. Instead, please use Crowdin. For more information read this page: https://obsproject.com/wiki/How-To-Contribute-Translations-For-OBS - Other ways to contribute are by helping people out with support on our forums or in our community chat. Please limit support to topics you fully understand -- bad advice is worse than no advice. When it comes to something that you don't fully know or understand, please defer to the official help or official channels. SAST Tools ---------- `PVS-Studio <https://pvs-studio.com/pvs-studio/?utm_source=website&utm_medium=github&utm_campaign=open_source>`_ - static analyzer for C, C++, C#, and Java code.