MJPEG Tools Svn

Seems that an athlon64 can return 31.

Operton and AMD64 update from Gert Vervoort

AMD64 fixes from gert dot vervoort at hccnet dot nl

This commit was manufactured by cvs2svn to create tag
'PRE_BACKMERGE_MPEG_DEVEL'.

This commit was manufactured by cvs2svn to create tag
'LAST_MPEG_DEVEL_MERGE'.

intsamesign() in fastintfns.h was broken for negative y values. The only
module which uses that function is quantize_ref.c so put a correct version in
that file and remove it from fastintfns.h

quicktime_read_audio() came up undefined when using the CVS version of
libquicktime (it is an obsolete function the libquicktime folks want to
get rid of as soon as possible). After asking on the libquicktime mailinglist
the replacement for quicktime_read_audio() is lqt_decode_audio_track().
A similar function exists for writing audio (lqt_encode_audio_track).
One VERY important and useful side effect of using the lqt_{encode|decode}_audio_track
routines is that they handle the endianness of the data - the underlying
libquickime routines know about flipping the bytes and thus that logic can
disappear from lav_io.c

Fixed buffer size (tempfile[256]) could overflow if a long pathname was
passed. strdup() was used for the filename itself so malloc the tempfile
name as well!

is_MJPG was very carefully set and cleared - but then NEVER used.

Only 1 use of lav_filetype() left - all the others had long since been replaced
by lav_file->format.