[MPlayer-dev-eng] [PATCH] Fix return types of libvo API

[Ivo]

Hi,

As stated in an earlier post, the libvo functions that return a value are 
declared wrongly. They return uint32_t, but lots of vo's return -1 in 
certain functions, or  <= VO_ERROR (<= -1). This patch changes all 
declarations and definitions to static int instead of static uint32_t.

Please test on as many machines and configurations you have. About half of 
the vo's are not compiled in on my machine (especially the "obscure" ones 
like dxr* and zr*, etc. and windows and macosx stuff), so they are 
untested. I have proofread the whole patch once for typo's (like init 
instead of int, occured twice) but an error can always have slipped in.

I have not seen any ill effects yet, now that the calling code actually gets 
negative values for VO_ERROR/NOTIMPL/etc., but there might be. Look out for 
them and report back please :)

--Ivo
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