vo: add VO_CAP_DEINTERLACE

This is used to signal when the VO can do deinterlacing itself, instead
of using a filter

Author: llyyr

filters/f_output_chain.c

@@ -394,6 +394,7 @@ void mp_output_chain_set_vo(struct mp_output_chain *c, struct vo *vo)
     p->stream_info.osd = vo ? vo->osd : NULL;
     p->stream_info.vflip = vo ? vo->driver->caps & VO_CAP_VFLIP : false;
     p->stream_info.rotate90 = vo ? vo->driver->caps & VO_CAP_ROTATE90 : false;
+    p->stream_info.deinterlace = vo ? vo->driver->caps & VO_CAP_DEINTERLACE : false;
     p->stream_info.dr_vo = vo;
     p->vo = vo;
     update_output_caps(p);

filters/filter.h

@@ -408,6 +408,7 @@ struct mp_stream_info {
     bool vflip;
     bool rotate90;
     bool force_swdec;
+    bool deinterlace;
     struct vo *dr_vo; // for calling vo_get_image()
 };
 

video/out/vo.h

@@ -205,6 +205,8 @@ enum {
     VO_CAP_FRAMEOWNER   = 1 << 5,
     // VO does handle mp_image_params.vflip
     VO_CAP_VFLIP        = 1 << 6,
+    // VO supports deinterlacing
+    VO_CAP_DEINTERLACE  = 1 << 7,
 };
 
 enum {