Hi, I'm Min-chul in South korea. I have some questions.

First, I want to make a MPEG-4 BSAC decoder faster. So, I'm applying IPP MPEG-2 AAC function to BSAC decoder. I already substituted the filter bank API(IMDCT) of BSAC for ippsMDCTInv_AAC_32s_I(). But, as a result of the conformance test, I knew that only exchanging IMDCT part made the quality of the sound worse. Especially, the frame to use 8 short windows to decode a frame made a lot of noise. Let me know why and tell me how to correct it.

Second, I have a plan to substitute IPP functions(inverse Quantization ~ IMDCT) for equivalent BSAC functions. Do you think it will work well? Tell me what you think, please.

Regards,
Min-chul

**target OS : Win CE 4.2
target CPU : PXA 255
develoment tool : EVC++ 4.0

**IPP : Intel Integrated Performance Primitives

You seem to know it all technically - now just do some tests with real EARS and more programming in between - i think You do have all the answers in your head already - just put them in right order and You're ready to go !

P.S. This Q could better fit to "AAC - Tech", here you cannot except muct know-how for this kind of case ...

With heart : Mathias