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H.264 VA-API Support For Intel Clarkdale/Arrandale

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  • #16
    Originally posted by garytr24 View Post
    isn't it possible to get hardware assistance for decoding on g33 with gallium and the shader pipeline?
    Intel's IGPs aren't known for good shader performance. I doubt it's possible at all.

    Also, the kind of acceleration you get this way (that is, MC level) is not very useful, especially with H.264 high profile, where acceleration is most needed.
    H.264 data in high profile is normally encoded with CABAC. CABAC decoding needs a lot of processing power and cannot be parallelized well, thus it isn't viable for offload to shaders. If you approach high bitrates (like on bluray), if I remember correctly, CABAC usually becomes the most involving decoding step. And you can't speed it up with MC acceleration at all.

    Plain and simple, in my opinion, only full (i.e. bitstream/VLD level) acceleration is worth implementing when it comes to H.264.

    VC-1 is different, but it's not nearly as hard to decode as H.264 anyway.

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    • #17
      Originally posted by djiezes View Post
      As far as I gathered Ubuntu 10.04 - end of april - will use the 2.6.32 kernel. While the intel graphics support is only from 2.6.33 onwards? Same for this va-api?
      AFAIK the Ubuntu 10.04 release is using 2.6.32 kernel but with the drm (graphics kernel driver) from 2.6.33, so from a graphics POV you can pretty much think of it as being 2.6.33.

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      • #18
        Little More Detail Please

        I am new to getting things up and running on this new Gateway NV7915u laptop. I came across this post to get Ubuntu installed. It works but I think I have some stability issues when running Firefox. I chose to run 2.6.33. I am interested in using this feature but am a little unsure of how to get it installed. Can someone provide a little more detail on how to apply the patch. Thanks.

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        • #19
          Originally posted by uwgandalf View Post
          yep, I asked this in the VA mailing list, they said planned for Q2.
          Bad news, G45 support is planned for Q3, not Q2
          ## VGA ##
          AMD: X1950XTX, HD3870, HD5870
          Intel: GMA45, HD3000 (Core i5 2500K)

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          • #20
            I wonder why they began to implement this on the newer chips and not on the GM45. I would have thought they were far more people owning the older chips and wanting this feature than the newer chips.

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            • #21
              I don't know, there are even no laptops with the newer chips, only powerful desktops which do not need h.264 acceleration...
              ## VGA ##
              AMD: X1950XTX, HD3870, HD5870
              Intel: GMA45, HD3000 (Core i5 2500K)

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              • #22
                Well to me it looks just like a plain business decision. If takes X months per chip family, I would do it first on the latest as well.
                More sales if you can tick "H.264 acceleration on linux"

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