topic Re: h.264 AIC in Intel® Integrated Performance Primitives

h.264 AIC

math-bessel — Fri, 30 Nov 2007 13:41:32 GMT

Hi there!

I have some questions about intra-prediction functions.
Function ippiPredictIntra_4x4_H264_8u_C1IR correctly works?
Probably given function contains a mistake under condition of B1 = 1, B2 = 1, B3 = 1, B4 = 0.

Re: h.264 AIC

math-bessel — Fri, 30 Nov 2007 15:55:47 GMT

More detaled:
functions ippiPredictIntra_4x4 / ippiPredictIntra_16x16 in the case B1 = 0, B2 = 0, B3 = 0, B4 = 0 does not fill destination block by value "128".

Re: h.264 AIC

Vladimir_Dudnik — Mon, 17 Dec 2007 06:40:38 GMT

Usually this mean that function was called with wrong parameters, for example, asked to do vertical prediction but there is no upper block. Standard does not specify what to do in that case, so IPP function fills block with value 128.

Vladimir

Re: h.264 AIC

math-bessel — Tue, 18 Dec 2007 06:05:12 GMT

I have already found the reason of a mistake - wrong mode value. I thought, that for function correct mode value is not required, if the block doesn't have neighbours. I don't use returned values of ipp-functions, therefore have found a mistake not at once.
Thanks for the help.

You plan to add a 8x8 luma intra prediction mode in following versions of ipp library?

Re: h.264 AIC

Vladimir_Dudnik — Tue, 18 Dec 2007 21:32:20 GMT

Yes, we plan to add such functions in IPP 6.0 beta (not plan of record though)

Regards,
Vladimir

Re: h.264 AIC

math-bessel — Wed, 19 Dec 2007 05:56:48 GMT

Ok. But i have a wish - for optimization it is better to divide edge low-pass filtration and 8x8 luma prediction stages.