ffmpeg-mt and gradfun

gradfun.h is a stripped copy of mplayer vf_gradfun.c (a function has been renamed).

(This seems like a toolchain bug)

This restores the original logic from
c77ee763

It also adds the support for NV12.

De Charybde en Scylla

And patch the whole mess, because it seems they don't understand what Cross-Compilation is.

Most of the scripts' content could be factorized.

Unnamed POSIX semaphores don't work on Mac OS X at all.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

m_firstPos (iterator associated to a stl list container) is not guaranteed to be valid (the associated item may have been deleted). Up to vlc1.0, this was no problem, because deleting an item was also buggy (a no-op). From vlc1.1 on, m_firstPos must now be recomputed to ensure it keeps on pointing to a valid item in all cases.

start for instance a playlist with the 'Dragon' skin as a test case.
This was pointed out by colt45 (from the forum)

Signed-off-by: Pierre d'Herbemont <pdherbemont@free.fr>

Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

We cannot use any random type semantic that we do not know of.
This also works around bugs in deficient getaddrinfo() implementations.

Inspired by jetru's patches, thank you. This should fix #3451

This fixes some warnings.