[vlc-devel] Detecting fullscreen under X on linux? (for MMAL vout)

John Cox jc at kynesim.co.uk
Thu Jul 12 13:22:37 CEST 2018


>On Thu, Jul 12, 2018, at 12:51, John Cox wrote:
>> Hi All
>> I'm (still) working on the MMAL modules in VLC. The mmal vout module is
>> only really useful for fullscreen work or cases where there is no other
>> output method.  That said it is a much more efficient method of getting
>> pictures onto the screen than going via X and on a Pi that is important,
>> so it is definitely worth using if you want fullscreen output whether
>> launched from X or not.
>> As it stands, opening the module is gated by vout_display_IsWindowed(vd)
>This function will return true if there is an X "vout window" module handling the "vout display" module (yours).
>X "vout window" modules can be QT or modules/video_output/xcb/window.c.
>You need to run VLC with --window dummy to have vout_display_IsWindowed returning false.
>But this is not really what you want. You would like to open/close your module when the fullscreen state changes, right ?

Yes - Is that possible?

Thank you for rephrasing my question to say what I actually want.


John Cox

>> which always (at least as far as I've been able to detect) returns true
>> when launched from X no matter whether or not there are fullscreen
>> requests on the command line.  There are various fullscreen events and
>> cfg fields but they seem to be ifdefed out for everything except Windows
>> & OS2.  Given that, what would be the approved method of detecting a
>> fullscreen request so output can be routed via the mmal vout rather than
>> the X vout?
>> Many thanks
>> John Cox
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