Input and output data of encoder and decoder G726

Hi all,

I downloaded from the page of the TI G726 Encoder and Decoder c55xx, but there are questions.

http://software-dl.ti.com/dsps/dsps_public_sw/codecs/C55X_Speech/index_FDS.html
 G726 Encoder and Decoder, Version 2.00.00.012

・g726DecoderMain.c ([install folder]\G726_3X_REL200_ROOTDIR\g726\tstsrc\c55x)

line 121 to 123
        tablesPtr [0] = (void *) G726_TII_g726itbl40;
        tablesPtr [1] = (void *) G726_TII_adpcmalaw;
        tablesPtr [2] = (void *) G726_TII_adpcmmulaw;

I think to try to linear PCM format of the PCM, but can I do? Describe the three lines of the above in that case?
Input and output data of Codec do I can set the linear PCM data?
Do you have any information?

Regards.