fixes issue358

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Björn Axelsson, bjorn.axelsson intinor se

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when those codecs are not enabled.

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through lrintf(), that is gcc put the 32bit int flags in a 32bit float
which caused some to be lost ...).
I wonder why FATE did not pick this up?

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Originally committed as revision 26166 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

This together with the last commit fixes the strange behavior of -sws_flags.
(issue229)

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Add a check that checks that the width is within the choosen constant.
This might have been exploitable.

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through a context variable as this is simpler and i think also faster, but
the return value of functions could be used instead of course.
The code also ensures as a side effect that the AC decoder state does not
become invalid.
This fixes all known crashes. And outputs nothing in case of an error instead
of random noise.

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DECLARE_ALIGNED_8 is not defined at that point, but this code is powerpc
only, so it's really equivalent to DECLARE_ALIGNED(16...

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Originally committed as revision 12311 to svn://svn.ffmpeg.org/ffmpeg/trunk

Fixes decoding of vdr-radio.vdr. (issue198)

Originally committed as revision 12310 to svn://svn.ffmpeg.org/ffmpeg/trunk