Benjamin Gaignard
February 17, 2021
Reading time:
One of the platforms we have been working on at Collabora is VeriSilicon's Hantro Codec. This video IP is present on a number of popular SoCs (Rockchip, i.MX8, Microchip) and is marketed as a small and power efficient device, but it also has a feature that makes it specially attractive for open source developers: it is a stateless accelerator.
Stateless devices do not need firmware to operate, making them more robust and better suited for open source platforms, where having full control over the system is desirable. In this case, the support is split in two: a kernel driver (which is provided by a Video4Linux2 Hantro driver), and a userspace component (which can be provided by frameworks such as GStreamer and FFMPEG).
Our recent efforts on the Hantro kernel driver have resulted in the addition of H.264 decoding support and multiple performance improvements. Continuing this work, we are now introducing High Efficiency Video Coding (HEVC), also known as H.265, decoding support on NXP's i.MX8 M chipset.
Unlike the currently supported codecs (JPEG, MPEG-2, VP8 and H.264), HEVC doesn't rely on the G1 hardware block but on the second video processor unit: the G2.
For this first step, the driver supports the basic HEVC features up to level 5.1. Enhance features like 10-bits depth per sample with 4:2:0 chroma sampling, scaling or tile decoding could be added later. Another possible evolution is to take benefit of the hardware capability to use compressed buffers to limit the memory bandwidth consumption.
Supporting HEVC on the Hantro driver will help mature the HEVC V4L2 stateless API enough to be able to remove it from the staging directory. Getting HEVC as a stable API is an important requirement for the userland stacks that are relying on it.
More work is in the pipeline in the kernel side and in GStreamer, to improve CODEC support. For instance, we are working on VP9 decoding and V4L2 hardware accelerated encoding. Want to know more? Get in touch!
18/05/2023
Work continues on the Radxa ROCK5B RK388, as PCIe and RTL8125B networking support in U-boot have now been added. Publishing code as Open…
03/05/2023
NVK, an open-source Vulkan driver for NVIDIA hardware that is part of Mesa, now supports the Vulkan extension VK_KHR_multiview.
27/04/2023
The beauty of Open Source is that we can reuse code written by many other people, keep their authorship, and credit them for their work,…
18/04/2023
Want to develop your Meson project in a modern IDE? Make sure to install Meson VSCode extension which is now fully functional with the recent…
05/04/2023
Labeling errors are common in present open-source 3D perception datasets, which could have impactful consequences. To tackle this issue,…
10/03/2023
Since joining the graphics team at Collabora as a Software Engineering Intern last November, I have implemented several Vulkan API extensions…
Comments (1)
Amos Batto:
Feb 19, 2021 at 01:50 AM
I'm really excited that we will have working H.265 and VP9 on the Librem 5 smartphone, that uses the i.MX 8M Quad processor. As someone who preordered the Librem 5, I'm overjoyed that weI will have decent video on the device.
How much support did you get from VeriSilicon (or NXP/Rockchip/Microchip) to make this possible? Did you have any help from chipmakers figuring out how the Hantro G2 decoder works?
Reply to this comment
Reply to this comment
Add a Comment