waylandsink: improve the way the video size is passed to wlwindow and also improve the code for window creation

ext/wayland/gstwaylandsink.c

@@ -465,10 +465,6 @@ gst_wayland_sink_set_caps (GstBaseSink * bsink, GstCaps * caps)
   if (format == -1)
     goto invalid_format;
 
-  /* store the video size */
-  sink->video_width = info.width;
-  sink->video_height = info.height;
-
   /* verify we support the requested format */
   formats = sink->display->formats;
   for (i = 0; i < formats->len; i++) {
@@ -490,6 +486,10 @@ gst_wayland_sink_set_caps (GstBaseSink * bsink, GstCaps * caps)
   if (!gst_buffer_pool_set_config (newpool, structure))
     goto config_failed;
 
+  /* store the video info */
+  sink->video_info = info;
+  sink->video_info_changed = TRUE;
+
   gst_object_replace ((GstObject **) & sink->pool, (GstObject *) newpool);
   gst_object_unref (newpool);
 
@@ -654,30 +654,46 @@ gst_wayland_sink_render (GstBaseSink * bsink, GstBuffer * buffer)
   GstWlMeta *meta;
   GstFlowReturn ret = GST_FLOW_OK;
 
-  /* ask for window handle. do that before locking the sink, because
-   * set_window_handle & friends will lock it in this context */
-  if (!sink->window)
-    gst_video_overlay_prepare_window_handle (GST_VIDEO_OVERLAY (sink));
-
   g_mutex_lock (&sink->render_lock);
 
   GST_LOG_OBJECT (sink, "render buffer %p", buffer);
 
+  if (G_UNLIKELY (!sink->window)) {
+    /* ask for window handle. Unlock render_lock while doing that because
+     * set_window_handle & friends will lock it in this context */
+    g_mutex_unlock (&sink->render_lock);
+    gst_video_overlay_prepare_window_handle (GST_VIDEO_OVERLAY (sink));
+    g_mutex_lock (&sink->render_lock);
+
+    if (sink->window) {
+      /* inform the window about our caps */
+      gst_wl_window_set_video_info (sink->window, &sink->video_info);
+    } else {
+      /* if we were not provided a window, create one ourselves */
+      sink->window =
+          gst_wl_window_new_toplevel (sink->display, &sink->video_info);
+    }
+    sink->video_info_changed = FALSE;
+  }
+
   /* drop buffers until we get a frame callback */
   if (g_atomic_int_get (&sink->redraw_pending) == TRUE)
     goto done;
 
-  /* if we were not provided a window, create one ourselves */
-  if (!sink->window) {
-    sink->window = gst_wl_window_new_toplevel (sink->display, sink->video_width,
-        sink->video_height);
-  } else {
-    gst_wl_window_set_video_size (sink->window, sink->video_width,
-        sink->video_height);
-    if (sink->window->surface_width == 0 || sink->window->surface_height == 0)
-      goto no_window_size;
+  if (G_UNLIKELY (sink->video_info_changed)) {
+    gst_wl_window_set_video_info (sink->window, &sink->video_info);
+    sink->video_info_changed = FALSE;
   }
 
+  /* now that we have for sure set the video info on the window, it must have
+   * a valid size, otherwise this means that the application has called
+   * set_window_handle() without calling set_render_rectangle(), which is
+   * absolutely necessary for us.
+   */
+  if (G_UNLIKELY (sink->window->surface_width == 0 ||
+          sink->window->surface_height == 0))
+    goto no_window_size;
+
   meta = gst_buffer_get_wl_meta (buffer);
 
   if (meta && meta->pool->display == sink->display) {

ext/wayland/gstwaylandsink.h

@@ -23,7 +23,7 @@
 #define __GST_WAYLAND_VIDEO_SINK_H__
 
 #include <gst/gst.h>
-#include <gst/video/gstvideosink.h>
+#include <gst/video/video.h>
 
 #include <wayland-client.h>
 
@@ -57,8 +57,8 @@ struct _GstWaylandSink
   GstWlWindow *window;
   GstBufferPool *pool;
 
-  gint video_width;
-  gint video_height;
+  gboolean video_info_changed;
+  GstVideoInfo video_info;
 
   gchar *display_name;
 

ext/wayland/wlwindow.c

@@ -116,16 +116,16 @@ gst_wl_window_new_internal (GstWlDisplay * display, struct wl_surface *surface)
 }
 
 GstWlWindow *
-gst_wl_window_new_toplevel (GstWlDisplay * display, gint video_width,
-    gint video_height)
+gst_wl_window_new_toplevel (GstWlDisplay * display, GstVideoInfo * video_info)
 {
   GstWlWindow *window;
 
   window = gst_wl_window_new_internal (display,
       wl_compositor_create_surface (display->compositor));
 
-  gst_wl_window_set_video_size (window, video_width, video_height);
-  gst_wl_window_set_render_rectangle (window, 0, 0, video_width, video_height);
+  gst_wl_window_set_video_info (window, video_info);
+  gst_wl_window_set_render_rectangle (window, 0, 0, video_info->width,
+      video_info->height);
 
   window->shell_surface = wl_shell_get_shell_surface (display->shell,
       window->surface);
@@ -207,18 +207,16 @@ gst_wl_window_resize_internal (GstWlWindow * window)
 }
 
 void
-gst_wl_window_set_video_size (GstWlWindow * window, gint w, gint h)
+gst_wl_window_set_video_info (GstWlWindow * window, GstVideoInfo * info)
 {
   g_return_if_fail (window != NULL);
 
-  if (w != window->video_width || h != window->video_height) {
-    window->video_width = w;
-    window->video_height = h;
+  window->video_width = info->width;
+  window->video_height = info->height;
 
   if (window->render_rectangle.w != 0)
     gst_wl_window_resize_internal (window);
 }
-}
 
 void
 gst_wl_window_set_render_rectangle (GstWlWindow * window, gint x, gint y,

ext/wayland/wlwindow.h

@@ -22,7 +22,7 @@
 #define __GST_WL_WINDOW_H__
 
 #include "wldisplay.h"
-#include <gst/video/gstvideosink.h>
+#include <gst/video/video.h>
 
 G_BEGIN_DECLS
 
@@ -62,7 +62,7 @@ struct _GstWlWindowClass
 GType gst_wl_window_get_type (void);
 
 GstWlWindow *gst_wl_window_new_toplevel (GstWlDisplay * display,
-        gint video_width, gint video_height);
+        GstVideoInfo * video_info);
 GstWlWindow *gst_wl_window_new_in_surface (GstWlDisplay * display,
         struct wl_surface * parent);
 
@@ -71,7 +71,7 @@ struct wl_surface *gst_wl_window_get_wl_surface (GstWlWindow * window);
 gboolean gst_wl_window_is_toplevel (GstWlWindow *window);
 
 /* functions to manipulate the size on non-toplevel windows */
-void gst_wl_window_set_video_size (GstWlWindow * window, gint w, gint h);
+void gst_wl_window_set_video_info (GstWlWindow * window, GstVideoInfo * info);
 void gst_wl_window_set_render_rectangle (GstWlWindow * window, gint x, gint y,
         gint w, gint h);