[FFmpeg-devel] what is h264_idct_add8()?

Ronald S. Bultje rsbultje
Sat Sep 11 03:48:53 CEST 2010

Hi Michael,

On Mon, Sep 6, 2010 at 4:32 PM, Michael Niedermayer <michaelni at gmx.at> wrote:
> On Mon, Sep 06, 2010 at 12:33:13PM -0400, Ronald S. Bultje wrote:
> [...]
>> Michael, do you still have the patch that enables using idct_add8()
>> for chroma (probably in h264.c) so I can test it performance of
>> yasmified idct_add8 against the current code that doesn't use
>> idct_add8()?
> i tried a bit of find and grep but it seems iam not looking at the right
> place or not searching for the right thing

So what do you suggest we do?
a) remove the idct_add8() functions from H264DSPContext
b) leave as-is (because I can't test the my yasm conversion is correct)
c) convert it to yasm along with the rest, hope that it is correct
without testing (?)
d) something else?

(A) is easiest, but (C) may have some benefit if I decide to test the
performance benefit in the future with the yasmified version. (B)
means duplication of code and thus sounds like a bad plan...


More information about the ffmpeg-devel mailing list