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   ndufresne: <u>hverkuil</u>: speaking of VISL testing, in case you where not aware, on top of ChromeOS internal QA, its also being run in the GStreamer CI (for codec related changes only), See the test stage https://gitlab.freedesktop.org/ndufresne/gstreamer/-/pipelines/1273762
   <br> It does not catch everything, but we already prevented some reordering regressions with it, and in contrast to real HW testing, this is super fast
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   ndufresne: <u>hverkuil</u>: gstreamer supports allocation in both directions
   <br> we prefer device for V4L2 devices, and import into GPU/Display, but if there was such a thing as a comprehensible allocation API in DRM, we be doing more display side allocation
   <br> DMABuf Heap and UDMABuf is not in place, nor usable for now (missing a few things like pinchartl said)
   <br> in term of constraints, its pretty limited, format, display width/height, for video alignment its padding_top/right/bottom/right + stride_align, these are hints of cours
   <br> there is also a general prefix and padding size
   <br> (and pointer alignment, but usually this is not needed with device that do page aligned allocation)
   <br> <u>hverkuil</u>: gstreamer also rely on device validation, meaning we may endup trying to import a dmabuf, and falling back if the device said no, this is strictly needed with DRM drivers, cause they don't have the equivalent of TRY_FMT, and still needed fo rv4l2 since we can't know if it takes virtual memory, scattered memory, weird memory ;-P
   <br> trying to import in V4L2 is not as independant of the state as it should, a DIDIOC_TRY_PREPARE would certainly be an option to solve that
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   pinchartl: <u>ndufresne</u>: thanks for the feedback
   <br> <u>ndufresne</u>: what would you think of a VIDIOC_CREATE_BUF extension that takes a dmabuf ?
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   ndufresne: <u>pinchartl</u>: what is the difference between that and CREATE_BUFS (with memory type DMABUF) and calling VIDIOC_PREPARE ?
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