Hi Chen-Yu! Dne torek, 29. november 2022 ob 08:45:30 CET je Chen-Yu Tsai napisal(a): > The majority of the V4L2 stateless video decoder drivers use the MPLANE > interface. > > On the userspace side, Gstreamer supports non-MPLANE and MPLANE > interfaces. Chromium only supports the MPLANE interface, and is not yet > usable with standard desktop Linux. FFmpeg support for either has not > landed. I don't like fixing userspace issues in kernel, if kernel side works fine. Implementing missing non-MPLANE support in Chromium will also allow it to work with older kernels. Hans, what's linux-media politics about such changes? Best regards, Jernej > > A fallback route using libv4l is also available. The library translates > MPLANE interface ioctl calls to non-MPLANE ones, provided that the pixel > format used is single plane. > > Convert the Cedrus driver to the MPLANE interface, while keeping the > supported formats single plane. Besides backward compatibility through > the plugin, the hardware requires that different planes not be located > too far apart in memory. Keeping the single plane pixel format makes > this easy to enforce. > > Signed-off-by: Chen-Yu Tsai <wenst@xxxxxxxxxxxx> > --- > > This has been tested with Fluster. The score remained the same with or > without the patch. This also helps with getting VP8 decoding working > with Chromium's in-tree test program "video_decode_accelerator_tests", > though Chromium requires other changes regarding buffer allocation and > management.
