core: introduce separate VOCTRLs for screensaver stop/resume

This is slightly better because VOCTRL_RESUME/VOCTRL_PAUSE are usually
needed by VOs to know whether video is actually being played (for
whatever reason), and they wouldn't be passed to the backend's VOCTRL
handler, like vo_x11_control().

Also try to make sure that these flags (both pause state and screensaver
state) are set consistently in some corner cases. For example, it seems
enabling video in the middle of playing a file while the player is
paused would not set the paused flag.

If codec initialization fails, destroy the VO instead of keeping it
around to make sure the state is consistent.

Framestepping is implemented by unpausing the player for the duration of
a frame. Remove the special handling of VOCTRL_PAUSE/RESUME in these
cases. It was most likely needed because these VOCTRLs used to be
important for screen redrawing (blatant guess), which is now handled
completely differently. The only potentially bad side-effect is that the
screensaver will be disabled/reenabled for the duration of one frame.

1 files changed, 3 insertions, 0 deletions

diff --git a/video/out/vo.h b/video/out/vo.h
index 3dcc58b6c3..c1ab0eff8b 100644
--- a/video/out/vo.h
+++ b/video/out/vo.h
@@ -63,6 +63,9 @@ enum mp_voctrl {
 
     VOCTRL_SET_CURSOR_VISIBILITY,       // bool
 
+    VOCTRL_KILL_SCREENSAVER,
+    VOCTRL_RESTORE_SCREENSAVER,
+
     VOCTRL_SET_DEINTERLACE,
     VOCTRL_GET_DEINTERLACE,