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TI Home » TI E2E Community » Support Forums » Embedded Software » Multimedia Software Codecs » Multimedia Software Codecs forum » DM36x JPEGenc: CustomQ vs Qvalue
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DM36x JPEGenc: CustomQ vs Qvalue

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Chris Meng
Posted by Chris Meng
on May 02 2012 04:48 AM
Genius16260 points

Hi,

My customer wants to use CustomQ. But it seems the output is still effected by the value of Qvalue. Is that true?

If yes, what's the relationship between the Q table used  in codec and CustomQ/Qvalue? If I set Qvalue to 97 (max), does the the code use the q table in CustomQ without change?

Chris

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  • Yashwant Dutt
    Posted by Yashwant Dutt
    on May 02 2012 07:19 AM
    Genius15110 points

    Which device/codec is this Chris ?

    regards

    YD

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  • Yashwant Dutt
    Posted by Yashwant Dutt
    on May 02 2012 07:20 AM
    Genius15110 points

    Sorry, it seems  the subject line had that info, will ask appropriate person to reply.

    regards

    YD

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  • Akshay Panday
    Posted by Akshay Panday
    on May 02 2012 09:06 AM
    Expert1570 points

    Hi Chris,

    The DM365 will directly use the custom Q Matrix submitted by user. In a custom Q use case, the QValue parameter is ignored.

    Regards,

    Akshay

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  • Chris Meng
    Posted by Chris Meng
    on May 03 2012 01:37 AM
    Verified Answer
    Verified by Chris Meng
    Genius16260 points

    Akshay,

    Need we do below control call to set the CustomQ before process?

    IMG_Control((IIMGENC1_Handle)handle, JPEGENC_TI_ENCODE_SETCUSTOMQ,
                                            (IIMGENC1_DynamicParams *)&extn_dynamicParams, (IIMGENC1_Status *)&status);

    Chris

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  • Chris Meng
    Posted by Chris Meng
    on May 03 2012 05:23 AM
    Genius16260 points

    Yashwant,

    We made it work. We need to improve our JPEGenc user guide to add above info.

    Chris

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