Linux's Stateless H.264 Decode Interface Ready To Be Deemed Stable
Written by Michael Larabel in Multimedia on 17 November 2020 at 03:32 AM EST. 17 Comments
MULTIMEDIA --
The Linux kernel's stateless video decoder interface is used for video decoding where no state needs to be kept between processed video frames and allows for independently decoding each video frame. The H.264 stateless decode interface for the Linux kernel has been in the works for a few years and is now deemed ready and stable for dealing with modern stateless codecs.

Ezequiel Garcia of Collabora sent out a patch series for de-staging the stateless H.264 support and to move it into the formal kernel area. With that the user-space API around the H.264 stateless decoding is deemed "solid" and stable. Porting of the GStreamer V4L2 codecs to the new interface is now underway and FFmpeg/libavcodec is also looking to make use of this stateless interface.

Mainline Linux video decoders supporting this H.264 stateless video decode right now are the Allwinner Cedrus and Rockchip RKVDEC drivers.

If all goes well, this promotion of H.264 stateless support could happen for Linux 5.11.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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