libvo: register X11 connection fd in input event system

Register the X11 connection fd in the input system so that
mp_input_get_cmd() can immediately wake up and handle keyboard or
other X events. The callback calls vo_check_events() and tells the
input system to handle any input possibly recorded during that. Before
this was done for vo_xv only; this commit generalizes it to all VOs
that call vo_x11_create_vo_window() - those are hopefully ones that
will handle all X events in check_events().

The callback is only kept registered while the vo is properly
configured. At other times calling check_events() would not clear
pending input and so could lead to a busy loop.

libvo/video_out.c

@@ -35,6 +35,8 @@
 #include "geometry.h"
 #include "old_vo_wrapper.h"
 #include "input/input.h"
+#include "mp_fifo.h"
+
 
 #include "mp_msg.h"
 
@@ -352,8 +354,12 @@ void vo_flip_page(struct vo *vo, unsigned int pts_us, int duration)
 
 void vo_check_events(struct vo *vo)
 {
-    if (!vo->config_ok)
+    if (!vo->config_ok) {
+        if (vo->registered_fd != -1)
+            mp_input_rm_key_fd(vo->input_ctx, vo->registered_fd);
+        vo->registered_fd = -1;
         return;
+    }
     vo->driver->check_events(vo);
 }
 
@@ -365,6 +371,8 @@ void vo_seek_reset(struct vo *vo)
 
 void vo_destroy(struct vo *vo)
 {
+    if (vo->registered_fd != -1)
+        mp_input_rm_key_fd(vo->input_ctx, vo->registered_fd);
     vo->driver->uninit(vo);
     talloc_free(vo);
 }
@@ -393,6 +401,8 @@ struct vo *init_best_video_out(struct MPOpts *opts, struct vo_x11_state *x11,
         .x11 = x11,
         .key_fifo = key_fifo,
         .input_ctx = input_ctx,
+        .event_fd = -1,
+        .registered_fd = -1,
     };
     // first try the preferred drivers, with their optional subdevice param:
     if (vo_list && vo_list[0])
@@ -441,6 +451,13 @@ struct vo *init_best_video_out(struct MPOpts *opts, struct vo_x11_state *x11,
     return NULL;
 }
 
+static int event_fd_callback(void *ctx, int fd)
+{
+    struct vo *vo = ctx;
+    vo_check_events(vo);
+    return mplayer_get_key(vo->key_fifo, 0);
+}
+
 int vo_config(struct vo *vo, uint32_t width, uint32_t height,
                      uint32_t d_width, uint32_t d_height, uint32_t flags,
                      char *title, uint32_t format)
@@ -467,6 +484,11 @@ int vo_config(struct vo *vo, uint32_t width, uint32_t height,
                                  title, format);
     vo->config_ok = (ret == 0);
     vo->config_count += vo->config_ok;
+    if (vo->registered_fd == -1 && vo->event_fd != -1 && vo->config_ok) {
+        mp_input_add_key_fd(vo->input_ctx, vo->event_fd, 1, event_fd_callback,
+                            NULL, vo);
+        vo->registered_fd = vo->event_fd;
+    }
     return ret;
 }
 

libvo/video_out.h

@@ -251,6 +251,8 @@ struct vo {
     struct vo_x11_state *x11;
     struct mp_fifo *key_fifo;
     struct input_ctx *input_ctx;
+    int event_fd;  // check_events() should be called when this has input
+    int registered_fd;  // set to event_fd when registered in input system
 
     // requested position/resolution
     int dx;

libvo/vo_xv.c

@@ -61,9 +61,6 @@ Buffer allocation:
 
 #include "subopt-helper.h"
 
-#include "input/input.h"
-#include "mp_fifo.h"
-
 #include "libavutil/common.h"
 
 static const vo_info_t info = {
@@ -104,7 +101,6 @@ struct xvctx {
     struct vo_rect src_rect;
     struct vo_rect dst_rect;
     uint32_t max_width, max_height; // zero means: not set
-    int event_fd_registered; // for uninit called from preinit
     int mode_switched;
     int osd_objects_drawn;
     void (*draw_alpha_fnc)(void *ctx, int x0, int y0, int w, int h,
@@ -645,19 +641,10 @@ static void uninit(struct vo *vo)
     if (ctx->mode_switched)
         vo_vm_close(vo);
 #endif
-    if (ctx->event_fd_registered)
-        mp_input_rm_key_fd(vo->input_ctx, ConnectionNumber(vo->x11->display));
     // uninit() shouldn't get called unless initialization went past vo_init()
     vo_x11_uninit(vo);
 }
 
-static int x11_fd_callback(void *ctx, int fd)
-{
-    struct vo *vo = ctx;
-    check_events(vo);
-    return mplayer_get_key(vo->key_fifo, 0);
-}
-
 static int preinit(struct vo *vo, const char *arg)
 {
     XvPortID xv_p;
@@ -780,9 +767,6 @@ static int preinit(struct vo *vo, const char *arg)
     ctx->fo = XvListImageFormats(x11->display, x11->xv_port,
                                  (int *) &ctx->formats);
 
-    mp_input_add_key_fd(vo->input_ctx, ConnectionNumber(x11->display), 1,
-                        x11_fd_callback, NULL, vo);
-    ctx->event_fd_registered = 1;
     return 0;
 
   error:

libvo/x11_common.c

@@ -1123,6 +1123,7 @@ final:
   x11->vo_gc = XCreateGC(mDisplay, x11->window, GCForeground, &xgcv);
   XSync(mDisplay, False);
   x11->vo_mouse_autohide = 1;
+  vo->event_fd = ConnectionNumber(x11->display);
 }
 
 void vo_x11_clearwindow_part(struct vo *vo, Window vo_window,