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H.264 Decoding Tackled For Reverse-Engineered "Cedrus" Allwinner Video Decode Driver

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  • #11
    This preliminary H.264 video decoding with the Cedrus driver works with multimedia programs in user-space via the libvdpau-sunxi user-space component for offering up the well-supported VDPAU video decode API to media players, etc.
    Michael You mixed up libvdpau-sunxi, which is a precursor project, where most reverse engineering happened and current project, implementing V4L2 VPU kernel driver, which is based on knowledge from libvdpau-sunxi. However, there will be optional userspace library (since V4L2 codecs based on request API are not yet supported by any player), which will implement VAAPI interface.


    • #12
      Originally posted by tichun
      They can reverse-engineer it with 13 people in the company, but AMD cannot provide it for their own gcn1 devices? Weird.
      on what planet those 13 people reverse-engineered h264 decode on allwinner for amdgpu?
      Last edited by pal666; 14 June 2018, 11:13 AM.


      • #13
        Originally posted by tpruzina
        If my memory serves me right, 370X -> 370 -> 270X -> 7970 are basically the same GPU
        R7 370X/370 -> R9 270X/270/R7 265 -> 7870/7850 are based on Pitcairn.
        R9 280X/280 -> 7970/7950/7870XT are based on Tahiti.

        Both are first-generation GCN with only two(?) async compute queues and no FreeSync support for gaming. Supposedly they have FreeSync support for video playback, but I have never seen this work under any OS.