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  • casimir666September 15, 2008 3:02 PM PDT   
    DXVA specifications for G45 chipset?

    Hello,

    I'm one of the authors of "Media Player Classic - Homecinema" (http://sourceforge.net/projects/mpc-hc/). This open source player already support DXVA bitstream decoding with ATI and nVidia graphics cards.

    We plan to add support for Intel G45, but we have to following problem : standard Gui for H264 bitstream decoder (DXVA2_ModeH264_E and DXVA2_ModeH264_F) didn't seems to be implemented on G45. Furthermore, calls to function GetDecoderDeviceGuids on interface IDirectXVideoDecoderService return 2 Gui that did not appears in Microsoft DXVA specifications : BCC5DB6D-A2B6-4AF0-ACE4-ADB1F787BC89 and 604F8E68-4951-4C54-88FE-ABD25C15B3D6. I guess one of the is for VC1, and the other for H264 bitstream decoder.

    So my question is : does Intel use a specific protocol for bitstream decoder, and if so is it possible to have the specifications?

    Thanks

    Casimir



    ChrisMcVaySeptember 19, 2008 10:33 AM PDT
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    		 #1
    Re: DXVA specifications for G45 chipset?

    I'll look into this and let you know what I find.

     

    Chris



    ChrisMcVaySeptember 23, 2008 8:05 AM PDT
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    		 #2 Reply To #1
    Re: DXVA specifications for G45 chipset?

    It took me a couple of days as I had some dialog with the media engineers. Essentially, G45 doesn't support the standard GUIDs for VC1 or AVC, and the private specifications are not publicly available.

    It reminds me of a philosophical question - if an interface has no spec and no one is able to use it, does it truly exist?

     

    Chris



    casimir666September 23, 2008 11:27 AM PDT
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    		 #3 Reply To #2
    Re: DXVA specifications for G45 chipset?

    Thanks a lot Chris for your efforts to answer my question. I hope Intel will change his mind and publish this specifications in the future.

    Regards,

    Casimir



    ChrisMcVaySeptember 25, 2008 4:16 PM PDT
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    		 #4 Reply To #3
    Re: DXVA specifications for G45 chipset?
    Heh, me too. I'm continuing to push for this internally. We'll see how far I get.

     

    Chris

    mlohseOctober 17, 2008 8:56 AM PDT
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    		 #6 Reply To #2
    Re: DXVA specifications for G45 chipset?
    I am coming across this thread after a longer research on the web: I would be very interested in getting all technical information about how to use hardware decoding of the G45 / X4500HD platforms in custom software, i.e. is it fully DXVA compliant (1.0 and/or 2.0)? Is there an other (Intel) API for accessing these features? Is the API publicly available? If not (as it seems), how am I able to get access to this information?

    Thank you. Marco


    Cijo Abraham ManiOctober 18, 2008 2:13 AM PDT
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    		 #7 Reply To #6
    Re: DXVA specifications for G45 chipset?
    Quoting - mlohse
    I am coming across this thread after a longer research on the web: I would be very interested in getting all technical information about how to use hardware decoding of the G45 / X4500HD platforms in custom software, i.e. is it fully DXVA compliant (1.0 and/or 2.0)? Is there an other (Intel) API for accessing these features? Is the API publicly available? If not (as it seems), how am I able to get access to this information?

    Thank you. Marco

    Have you gone through the product specification ? Please go through the following PDF file .

    http://www.intel.com/assets/pdf/prodbrief/dg45id_product_brief.pdf

     

    The information you are searching for might  would be available there .

     

    Regards ,

    Cijo



    mlohseOctober 20, 2008 12:44 AM PDT
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    		 #8 Reply To #7
    Re: DXVA specifications for G45 chipset?
    Quoting - cijoaj2003

    Have you gone through the product specification ? Please go through the following PDF file .

    http://www.intel.com/assets/pdf/prodbrief/dg45id_product_brief.pdf

     

    The information you are searching for might  would be available there .

     

    Regards ,

    Cijo

    Thank you for your reply. From the pdf file you referenced (or the product brief of dg45fc, which I already read), I am unable to answer my questions, i.e. the document only says that DirectX 10 is supported, and some end-user software is included, which is related to media processing and playback. On the other hand, the discussion in this thread points out that some interfaces for hardware decoding are not public, are they?

     



    alex-domoqOctober 21, 2008 3:57 AM PDT
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    		 #9
    Re: DXVA specifications for G45 chipset?
    I would like to add, that X4500HD drivers for Windows XP seams to not support H264 HW Acceleration at all.
    I have tried all the accelerated codecs: TotalMedia, PowerDVD, WinDVD, etc, and they are not able to unload CPU from decoding in Windows XP, while they can in Vista.
    Anyone can confirm this?


    davidc1October 21, 2008 5:08 AM PDT
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    		 #10 Reply To #9
    Re: DXVA specifications for G45 chipset?
    Quoting - alex-domoq
    I would like to add, that X4500HD drivers for Windows XP seams to not support H264 HW Acceleration at all.
    I have tried all the accelerated codecs: TotalMedia, PowerDVD, WinDVD, etc, and they are not able to unload CPU from decoding in Windows XP, while they can in Vista.
    Anyone can confirm this?

    Intel follows the HDCP rules more strictly than ATI/Nvidia. Windows XP hardware acceleration with HD video aren't supported because of that. They don't like bending rules.



    alex-domoqOctober 21, 2008 9:48 AM PDT
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    		 #11 Reply To #10
    Re: DXVA specifications for G45 chipset?
    Quoting - davidc1

    Intel follows the HDCP rules more strictly than ATI/Nvidia. Windows XP hardware acceleration with HD video aren't supported because of that. They don't like bending rules.

    What does it means? HDCP is supported by the chipset. If the driver conforms to PAVP, the HW acceleration can be used on any operating System (linux inclusive).
    Can you calirfy your statement?



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