Graphics: Zink, VA-API, NVIDIA's NVAPI SDK
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Mike Blumenkrantz: Extensions
Usually I cover in-depth looks at various chunks of code I’ve been working on, but today it’s going to be a more traditional style of modern blogging: memes and complaining.
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New VA-API H.264 decoder in gst-plugins-bad
Recently, a new H.264 decoder, using VA-API, was merged in gst-plugins-bad.
Why another VA-based H.264 decoder if there is already gstreamer-vaapi?
As usual, an historical perspective may give some clues.
It started when Seungha Yang implemented the GStreamer decoders for Windows using DXVA2 and D3D11 APIs.
Perhaps we need one step back and explain what are stateless decoders.
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NVIDIA open sourced part of NVAPI SDK to aid 'Windows emulation environments'
NVIDIA sneakily put out a little open source release recently, with a part of the NVAPI SDK now under the MIT license.
This was mentioned by the crew working on the DXVK translation layer in the VKx Discord, who sent along word to me as well. NVAPI is NVIDIA's core software development kit that allows direct access to NVIDIA GPUs and drivers on all Windows platforms.
Now, that doesn't sound interesting for Linux obviously but here's why this actually is important: in the NVAPI Open Source SDK, it directly mentions that the contained "nvapi.h" file that's now provided under the MIT license was done to enable "open source re-implementations of NVAPI for Windows emulation environments"—so the Wine and Proton compatibility layers are what they're getting at without naming them directly.
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