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@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
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