player/video: check for forced eof

It's a bit of an edge case, but since we now allow the disabling of the
software fallback it's possible to have a situation where hwdec
completely fails and the mpv window is still lingering from the previous
item in the playlist. What needs to happen is simply that the vo_chain
should uninit itself and handle force_window if needed. In order to do
that, a new VDCTRL is added that checks vd_lavc if force_eof was set.
player/video will then start the uninit process if needed after getting
this.

filters/f_decoder_wrapper.h

@@ -77,6 +77,7 @@ enum dec_ctrl {
     VDCTRL_GET_BFRAMES,
     // framedrop mode: 0=none, 1=standard, 2=hrseek
     VDCTRL_SET_FRAMEDROP,
+    VDCTRL_CHECK_FORCED_EOF,
 };
 
 int mp_decoder_wrapper_control(struct mp_decoder_wrapper *d,

player/video.c

@@ -573,6 +573,16 @@ static bool check_for_hwdec_fallback(struct MPContext *mpctx)
     return true;
 }
 
+static bool check_for_forced_eof(struct MPContext *mpctx)
+{
+    struct vo_chain *vo_c = mpctx->vo_chain;
+    struct mp_decoder_wrapper *dec = vo_c->track->dec;
+
+    bool forced_eof = false;
+    mp_decoder_wrapper_control(dec, VDCTRL_CHECK_FORCED_EOF, &forced_eof);
+    return forced_eof;
+}
+
 /* Update avsync before a new video frame is displayed. Actually, this can be
  * called arbitrarily often before the actual display.
  * This adjusts the time of the next video frame */
@@ -1041,6 +1051,11 @@ void write_video(struct MPContext *mpctx)
     if (r == VD_EOF) {
         if (check_for_hwdec_fallback(mpctx))
             return;
+        if (check_for_forced_eof(mpctx)) {
+            uninit_video_chain(mpctx);
+            handle_force_window(mpctx, true);
+            return;
+        }
         if (vo_c->filter->failed_output_conversion)
             goto error;
 

video/decode/vd_lavc.c

@@ -1325,6 +1325,10 @@ static int control(struct mp_filter *vd, enum dec_ctrl cmd, void *arg)
     case VDCTRL_SET_FRAMEDROP:
         ctx->framedrop_flags = *(int *)arg;
         return CONTROL_TRUE;
+    case VDCTRL_CHECK_FORCED_EOF: {
+        *(bool *)arg = ctx->force_eof;
+        return CONTROL_TRUE;
+    }
     case VDCTRL_GET_BFRAMES: {
         AVCodecContext *avctx = ctx->avctx;
         if (!avctx)