[FFmpeg-devel] Unused symbols in vc1data

Kostya kostya.shishkov
Wed Apr 30 17:33:08 CEST 2008

On Wed, Apr 30, 2008 at 04:26:11PM +0200, Diego 'Flameeyes' Petten? wrote:
> Hi there,
> (Beside the fact I still have a queue of patches I should be
> polishing..)
> 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
> done.

Err, I was intending to add more of such unused data and then use it
in interlaced decoding.

ff_vc1_norm6_spec can be commented out though.
> -- 
> Diego "Flameeyes" Petten?

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