The SDL audio output is gone. The SDL video output is not very useful
and it won't quite work with most SDL video plugins disabled.

SDL is mainly a dependency for SDL_image.

As things stand, we have a format that is neither S/PDIF nor linear,
so change the macros to remove the confusion.

This plugin modifies the output format. It caused a busy loop
and broke libmad on fixed-point architectures (fixes #5151).

The new Peek() function now allocates a block (p_sys->peeked) if the
required size (i_peek) is greater than the size of the playback
segment, and then do a copy of one (or several) segment's data block(s) in it.
In the end, p_sys->peeked might be the concatenation of several segment's data
blocks, but usually it will be NULL.
Signed-off-by: Jean-Paul Saman <jean-paul.saman@m2x.nl>

remove useless prototype
inline vlc identity in the only use case

fix memleak when thread is cancelled

remove FREE_ATT, use do { ... } while(0) for FREE_VALUE
use static const tables for xml handlers
use their size to match handlers with tags
replace {SIMPLE,COMPLEX,UNKNOWN}_CONTENT with a bool

also remove one level of indentation

Cf CVE-2011-0226

Cf CVE-2011-0226

The decoder takes care of that.