XCB/XVideo: enumerate adaptors

modules/video_output/xcb/xvideo.c

@@ -52,6 +52,7 @@
 
 static int  Open (vlc_object_t *);
 static void Close (vlc_object_t *);
+static int EnumAdaptors (vlc_object_t *, const char *, int64_t **, char ***);
 
 /*
  * Module descriptor
@@ -66,6 +67,7 @@ vlc_module_begin ()
 
     add_integer ("xvideo-adaptor", -1,
                  ADAPTOR_TEXT, ADAPTOR_LONGTEXT, true)
+        change_integer_cb (EnumAdaptors)
     add_integer ("xvideo-format-id", 0,
                  FORMAT_TEXT, FORMAT_LONGTEXT, true)
     add_obsolete_bool ("xvideo-shm") /* removed in 2.0.0 */
@@ -847,3 +849,78 @@ static void Manage (vout_display_t *vd)
     ManageEvent (vd, p_sys->conn, &p_sys->visible);
 }
 
+static int EnumAdaptors (vlc_object_t *obj, const char *var,
+                         int64_t **vp, char ***tp)
+{
+    size_t n = 0;
+
+    /* Connect to X */
+    char *display = var_InheritString (obj, "x11-display");
+    xcb_connection_t *conn;
+    int snum;
+
+    conn = xcb_connect (display, &snum);
+    free (display);
+    if (xcb_connection_has_error (conn) /*== NULL*/)
+        goto error;
+
+    /* Find configured screen */
+    const xcb_setup_t *setup = xcb_get_setup (conn);
+    const xcb_screen_t *scr = NULL;
+    for (xcb_screen_iterator_t i = xcb_setup_roots_iterator (setup);
+         i.rem > 0; xcb_screen_next (&i))
+    {
+        if (snum == 0)
+        {
+            scr = i.data;
+            break;
+        }
+        snum--;
+    }
+    if (scr == NULL)
+        goto error;
+
+    xcb_xv_query_adaptors_reply_t *adaptors =
+        xcb_xv_query_adaptors_reply (conn,
+            xcb_xv_query_adaptors (conn, scr->root), NULL);
+    if (adaptors == NULL)
+        goto error;
+
+    xcb_xv_adaptor_info_iterator_t it;
+
+    for (it = xcb_xv_query_adaptors_info_iterator (adaptors);
+         it.rem > 0;
+         xcb_xv_adaptor_info_next (&it))
+        n++;
+
+    int64_t *values = xmalloc ((n + 1) * sizeof (*values));
+    char **texts = xmalloc ((n + 1) * sizeof (*texts));
+    *vp = values;
+    *tp = texts;
+    n = 0;
+
+    *(values++) = -1;
+    *(texts++) = strdup (N_("Auto"));
+    n++;
+
+    for (it = xcb_xv_query_adaptors_info_iterator (adaptors);
+         it.rem > 0;
+         xcb_xv_adaptor_info_next (&it))
+    {
+        const xcb_xv_adaptor_info_t *a = it.data;
+
+        n++;
+
+        if (!(a->type & XCB_XV_TYPE_INPUT_MASK)
+         || !(a->type & XCB_XV_TYPE_IMAGE_MASK))
+            continue;
+
+        *(values++) = n - 2;
+        *(texts++) = strndup (xcb_xv_adaptor_info_name (a), a->name_size);
+    }
+    free (adaptors);
+error:
+    xcb_disconnect (conn);
+    (void) obj; (void) var;
+    return n;
+}