[FFmpeg-devel] Unused symbols in vc1data

Diego 'Flameeyes' Pettenò flameeyes
Wed Apr 30 16:26:11 CEST 2008

Hi there,

(Beside the fact I still have a queue of patches I should be

I wrote a new script today to deal with ELF object files, it finds
functions that are not used in a project beside for the unit they are
defined. While this triggers false positive for exported symbols (unless
the project uses hidden visibility for non-exported symbols), it also
shows unused symbols. It needs a bit of fiddling to become safe, but the
results are interesting.

For FFmpeg I've seen there are a few symbols defind in vc1data that are
never used, not in FFmpeg's source tree at least. They are prefixed with
ff_ so I suppose they would be exported.

Do you want a patch to get rid of them? It would probably reduce the
size of libavcodec..

ff_vc1_adv_interlaced_4x4_zz (./libavcodec/vc1data.o)
ff_vc1_adv_interlaced_4x8_zz (./libavcodec/vc1data.o)
ff_vc1_adv_interlaced_8x4_zz (./libavcodec/vc1data.o)
ff_vc1_adv_interlaced_8x8_zz (./libavcodec/vc1data.o)
ff_vc1_norm6_spec (./libavcodec/vc1data.o)

I'm looking at a few more now, will see to get a full report once I'm

Diego "Flameeyes" Petten?

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