IMX1 jpeg encoder DCT optimization

[bend]

Hello, I'm trying to optimize libjpeg 6b using DCT of the Multmedia Accelerator integrated in IMX1 chip.

I use the /dev/dct drive but I have some difficulties to integrate it in the jpeg library. DCT software calculation in jpeg library is different of DCT IMX1 hardware calculation. The compare calculation are incompatible, different range of data ?

Thank you in advance,

Benoît Degand

[bend · Accepted solution]

Well, I succeed in using the IMX1 iDCT computation but the DCT don't give me the expected result.

I'm using this 8x8 matrice sample to test DCT.

http://fr.wikipedia.org/wiki/Compression_JPEG

See you soon for next step, I hope!