theora dev - Mar 2011 - idct/fdct.c function calls

Hi.
I am trying to find calls of idct/fdct.c functions by tracing png2theora.c
calls.
But found only:
analyze.c:oc_dct_cost2()

Where and when idct/fdct/mmxidct/mmxfdct.c functions are used?

Mentions of "dct" word:
===pacify at optima-amd64:/usr/src/libtheora-1.2.0alpha1/lib$ grep dct *.c | cut
-f1 -d":" | uniq -c
???? 19 analyze.c
???? 28 decode.c
???? 22 encode.c
????? 4 enquant.c
???? 25 fdct.c
???? 42 idct.c
???? 10 state.c
???? 66 tokenize.c
===
-- 
 Alexander Lubyagin

(Irrelevant results trimmed):

grep \\\<oc_enc_fdct *.c
analyze.c:  oc_enc_fdct8x8(_enc,dct,data);

grep \\\<oc_idct *.c
analyze.c:    oc_idct8x8(&_enc->state,data,idct,nonzero+1);
state.c:    oc_idct8x8(_state,_dct_coeffs+64,_dct_coeffs,_last_zzi);