libdbus has multiple thread-safety issues and using private connections
(ie: not shared with other vlc modules) helps avoiding some of them.

thx to j-b for the reminder

This happens almost all the time, and is unfortunately normal behavior.

This should fix the infrequent assertions failures at exit.

The decoder thread drains the output at end of stream. So there is
always an underflow between consequent audio inputs.
Thus this does not provide gap-less audio as is.

macosx: fail the video output if Quartz Extreme isn't supported, removed specific options, which are now handled by the core

QE is supported on virtually any Mac is running 10.5+ except for broken Hackintoshes

no functional change

This had no relations with the audio input anymore. In particular,
there is no need to reinitialize this when the input is restarted.

I assume this breaks with S/PDIF. And I do not see much use for this.

removed the broken fps display and added a field for EncodedBy

fixes #4710

This ensures that the variables will be available as soon as the aout
is externally visible, and that there value will persist across inputs.

This also saves a bunch of lookup at each new input.

Those variables are inherited and they have no callbacks.

(Lets assume that uintptr_t is big enough, i.e. 32-bits).

 - get the mode string directly from the callback (new) variable value,
 - reduce locking scope,
 - fix read overflow: do not apply peak protection in "max" mode.

split out some functions from Open()
move static functions
sout_stream_id_t -> define struct as empty and use the pointer to store sout_input_t

functional change:
do not force asfh mux if user specified another one but only warn him (like for upd/ts)

makes data smaller:
 no need to store pointers to each item of the array

char *x[] = { "a", "b", "c" };
memory looks like => "a" "b" "c" (&x) &a &b &c

char x[][2] = { "a", "b", "c" };
memory looks like => (&x) "a" "b" "c"

macosx: move VLCFSPanel from VLCControls to VLCMainWindow since its the only class which should know about it