core: add --force-window

This commit adds the --force-window option, which will cause mpv always
to create a window when started. This can be useful when pretending that
mpv is a GUI application (which it isn't, but users pretend anyway), and
playing audio files would run mpv in the background without giving a
window to control it.

This doesn't actually create the window immediately: it only does so
only after initializing playback and when it is clear that there won't
be any actual video. This could be a problem when starting slow or
completely stuck network streams (mpv would remain frozen in the
background), or if video initialization somehow is stuck forever in
an in-between state (like when the decoder doesn't output a video
frame, but doesn't return an error either). Well, we can pretend only
so much that mpv is a GUI application.

1 files changed, 1 insertions, 0 deletions

diff --git a/mpvcore/options.h b/mpvcore/options.h
index fb88456ac9..0f3fa51549 100644
--- a/mpvcore/options.h
+++ b/mpvcore/options.h
@@ -50,6 +50,7 @@ typedef struct MPOpts {
 
     struct m_obj_settings *audio_driver_list;
     int fixed_vo;
+    int force_vo;
     int softvol;
     float mixer_init_volume;
     int mixer_init_mute;