[FFmpeg-cvslog] mem: Document the av_realloc family of functions properly

[Nicolas George]

L'octidi 18 fructidor, an CCXXI, Clément Bœsch a écrit :
> Can someone explains to me what the hell that means? Is this a typo?
> 
> AFAIK it just means the alignment might not be preserved. What am I
> missing?

Actually no, the spec really says that only memory allocated by
malloc()/calloc()/realloc() can be used with realloc, and therefore not
av_malloc() since it calls posix_memalign().

In practice, that means you can only use av_realloc() with itself, i.e.
starting with NULL and reallocating larger. That is already what most code
does anyway.

Regards,

-- 
  Nicolas George
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