Queue more than one audio buffer at a time (limit of 1 second). TimeGet will
report a bigger delay, but the module will be more stable and more efficient.

AudioTrack delay is now calculated by JNIThread when a buffer is written.
Overall delay is calculated in TimeGet by adding AudioTrack delay and queued
delay.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Fix callback leak.

This was a remnant from the times of VLC_VAR_OBJECT.

Close #13972
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Rafaël Carré <funman@videolan.org>

Close #13973

Close #13971

This might suppress some warnings (and very slightly reduce code size)
when assertions are disabled. Not that I particularly like to create
VLC-specific macros.

Close #13963

Because tmpfile() cannot be used if not admin on the machine on
Windows...

Close #13642

malloc(0) can return NULL. Don't use it to generate a non-NULL value
(NULL is the error code for sout_stream_t.pf_add).

As far as I can tell, this is not allowed by the ISO C specification
(it is permitted in C++ though).

See QTBUG-30359
Close #13646

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Makes sure the prefs window does not stay on top and hides
all other applications if VLC is inactive.

OpenSSL is the default if both exist

Ref #13826

This matches the ALSA implementation now.