This lifts the PATH_MAX characters limit, and should fix encoding on
POSIX non-UTF-8 systems.

Decoders are never "killed", so this had no effects.

(Same reasons as VLC_OBJECT_AOUT)

Audio output is not a descendent of input thread, so there was no real
use for this object type anymore.

macosx: make sure that we don't block media keys for iTunes in case the user doesn't want to use them within VLC

Changing this option requires a relaunch now, which is automatically offered when needed.

Fixes #5025

3gp4 is not compatible to isom, while 5, 6 and 7 should be
Ref #4979

This doesn't help users to report issues...

Without this, libvlc_media_parse() will deadlock on non-file items.

Also fix indentation (4 spaces)

This has no effects, so lets not do it.

Change the MacOS GUI to trigger the fade of all the displays to black
when entering & leaving full screen mode only if the "Black out other
displays" preference is set.
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

Tests show that current docs are wrong.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Audio output should be more efficient on FPU-less devices.
Firstly the mixer should be faster with 16-bits instead of 32.
Secondly FPU-less systems usually output at 16-bits, so one sample
format conversion between the mixer and the output is now avoided.
Thirdly conversion from input format to the mixer format should
similarly be completely avoided or at least accelerated.

With only one input per output, the lock is only useful:
 - to restart the audio instance (needed 3 out of 4 locks anyway),
 - to propagate volume change to the mixer or output plugin,
 - to access the FIFO from the output plugin thread (if applicable).

So 4 fine-grained was over-engineering. Most importantly, the locking
scheme was overly complicated and generally misunderstood/misused. Also
to avoid lock inversion, some unlocking/relocking sequences were
introduced; they broke atomicity.

We could certainly reduce the scope of the remaining lock. Since we
have one only input per output, most of the code is only ever run from
the decoder thread. Thus reentrancy is not anymore needed in some
places. But first aout_Restart() needs to be fixed and simplified.