Search Results for: VPU

With DMABUF support tested, it has become possible for Paul to start the work on integrating a GPU-based video output pipeline with Sunxi-Cedrus. Using the GPU should greatly improve performance when it comes to displaying the video frames. As of now, we have been using software untiling, software YUV-to-RGB colorspace conversion and software scaling. We … Continue reading “Allwinner VPU support in mainline Linux status update (week 20)”

This week has seen considerably less advancement than the ones before it due to bank holidays in France. Nevertheless, we managed to prepare and send V3 of the Sunxi-Cedrus Linux kernel driver on Monday. While this new version contains several incremental improvements, a number of tasks (described in the series’ cover letter) have yet to … Continue reading “Allwinner VPU support in mainline Linux status update (week 19)”

This week, Paul continued working on DMABUF support and succeeded at exporting a buffer allocated by the Sunxi-Cedrus driver on the v4l2 side and importing it on the drm side via DMABUF. Although DMABUF support is still a work in progress in cedrus-frame-test and beyond the current level of support we have with GStreamer, the … Continue reading “Allwinner VPU support in mainline Linux status update (week 18)”

This week started off with numerous reviews received on the patchset introducing the Sunxi-Cedrus VPU driver. Lots of constructive comments, questions and improvements were discussed, which will help improve the driver for the next iteration of the series. Changes to other drivers will also have to be implemented, in particular to the SRAM controller found … Continue reading “Allwinner VPU support in mainline Linux status update (week 17)”

As announced last week, the second revision of the Sunxi-Cedrus driver patchset was submitted for review earlier this week. While this new revision is based on the latest version of the request API, it also includes several fixes for corner-cases of this new API, especially to use it in the context of a M2M driver. … Continue reading “Allwinner VPU support in mainline Linux status update (week 16)”

This week, Paul worked on preparing a new version of the patch series introducing support for the Sunxi-Cedrus VPU kernel driver, based upon the latest version of the Request API as submitted for review by Hans Verkuil on Monday. In order to make it easier to test the kernel driver, a standalone tool was written … Continue reading “Allwinner VPU support in mainline Linux status update (week 15)”

This week has seen progress on the GStreamer front: the segmentation fault that was a blocker when interfacing our libva backend with gstreamer-vaapi was investigated and understood. An associated bug was reported to the GNOME bug tracker, with all the gory details attached. Since the issue was in fact due to the assembly routine imported … Continue reading “Allwinner VPU support in mainline Linux status update (week 14)”

While this week’s goal was set to supporting dmabuf in our Sunxi-Cedrus VAAPI implementation with GStreamer, progress was made on GStreamer support alone. The first milestone was displaying the video from videotestsrc, which produces a sample test output, to kmssink, which handles video output directly with DRM planes. This required specific adaptation for GStreamer to … Continue reading “Allwinner VPU support in mainline Linux status update (week 13)”

Early February, we announced the launch of our first Kickstarter campaign, whose goal was to add support for the video decoding unit found in most Allwinner processors to the official Linux kernel. We were very pleased to see that in just one day, enough companies and individuals participated to fund the main goal of the … Continue reading “Kickstarter for the Allwinner VPU Linux kernel support successfully funded!”

Following up on the work started last week, I finished implementing initial support for displaying the NV12-based tiled format (that we shall call MB32-tiled NV12). The frame, that was dumped from the VPU, is now correctly displayed on the screen (after adapting scaling coefficients that needed specific tweaking for this use case). The result can … Continue reading “Allwinner VPU support in mainline Linux status update (week 12)”