Performance: render video and black background in single GL pass

clapper_src/widget.js

@@ -47,15 +47,12 @@ var Widget = GObject.registerClass({
         this.needsTracksUpdate = true;
         this.mediaInfoSignal = null;
 
-        this.videoBox = new Gtk.Box();
         this.overlay = new Gtk.Overlay();
         this.revealerTop = new Revealers.RevealerTop();
         this.revealerBottom = new Revealers.RevealerBottom();
         this.controls = new Controls();
 
-        this.videoBox.add_css_class('videobox');
-        this.videoBox.append(this.overlay);
-        this.attach(this.videoBox, 0, 0, 1, 1);
+        this.attach(this.overlay, 0, 0, 1, 1);
         this.attach(this.controls, 0, 1, 1, 1);
 
         this.mapSignal = this.connect('map', this._onMap.bind(this));

css/styles.css

@@ -31,9 +31,6 @@ scale marks {
   font-variant-numeric: tabular-nums;
   font-weight: 600;
 }
-.videobox {
-  background: black;
-}
 .reavealertop {
   min-height: 90px;
   box-shadow: inset 0px 200px 10px -124px rgba(0,0,0,0.3);

pkgs/flatpak/gstreamer-1.0/gst-plugins-good-gtk4-do-not-depend-on-destroy-signal-for-cleanup.patch

@@ -0,0 +1,108 @@
+From 7808862454aa50afde85462c1b55a256096bfdef Mon Sep 17 00:00:00 2001
+From: Rafostar <rafostar.github@gmail.com>
+Date: Thu, 12 Nov 2020 18:16:23 +0100
+Subject: [PATCH] gtk4: do not depend on "destroy" signal for cleanup
+
+In GTK4 the "destroy" signal will not be emitted
+as long as someone is holding a ref on an object.
+We cannot use it to do the unref anymore.
+
+This commit removes the floating ref and "destroy"
+signal connection used to do the unref.
+---
+ ext/gtk/gstgtkbasesink.c | 27 ++++++---------------------
+ ext/gtk/gstgtkbasesink.h |  1 -
+ 2 files changed, 6 insertions(+), 22 deletions(-)
+
+diff --git a/ext/gtk/gstgtkbasesink.c b/ext/gtk/gstgtkbasesink.c
+index 1f5319089..ea11bec40 100644
+--- a/ext/gtk/gstgtkbasesink.c
++++ b/ext/gtk/gstgtkbasesink.c
+@@ -153,21 +153,12 @@ gst_gtk_base_sink_finalize (GObject * object)
+   GST_OBJECT_LOCK (gtk_sink);
+   if (gtk_sink->window && gtk_sink->window_destroy_id)
+     g_signal_handler_disconnect (gtk_sink->window, gtk_sink->window_destroy_id);
+-  if (gtk_sink->widget && gtk_sink->widget_destroy_id)
+-    g_signal_handler_disconnect (gtk_sink->widget, gtk_sink->widget_destroy_id);
+ 
+-  g_clear_object (&gtk_sink->widget);
++  gtk_sink->widget = NULL;
+   GST_OBJECT_UNLOCK (gtk_sink);
+ 
+   G_OBJECT_CLASS (parent_class)->finalize (object);
+-}
+-
+-static void
+-widget_destroy_cb (GtkWidget * widget, GstGtkBaseSink * gtk_sink)
+-{
+-  GST_OBJECT_LOCK (gtk_sink);
+-  g_clear_object (&gtk_sink->widget);
+-  GST_OBJECT_UNLOCK (gtk_sink);
++  GST_DEBUG ("finalized base sink");
+ }
+ 
+ static void
+@@ -211,12 +202,6 @@ gst_gtk_base_sink_get_widget (GstGtkBaseSink * gtk_sink)
+       "ignore-alpha", G_BINDING_BIDIRECTIONAL | G_BINDING_SYNC_CREATE);
+ #endif
+ 
+-  /* Take the floating ref, other wise the destruction of the container will
+-   * make this widget disappear possibly before we are done. */
+-  gst_object_ref_sink (gtk_sink->widget);
+-  gtk_sink->widget_destroy_id = g_signal_connect (gtk_sink->widget, "destroy",
+-      G_CALLBACK (widget_destroy_cb), gtk_sink);
+-
+   /* back pointer */
+   gtk_gst_base_widget_set_element (GTK_GST_BASE_WIDGET (gtk_sink->widget),
+       GST_ELEMENT (gtk_sink));
+@@ -236,7 +221,7 @@ gst_gtk_base_sink_get_property (GObject * object, guint prop_id,
+       GObject *widget = NULL;
+ 
+       GST_OBJECT_LOCK (gtk_sink);
+-      if (gtk_sink->widget != NULL)
++      if (GTK_IS_WIDGET (gtk_sink->widget))
+         widget = G_OBJECT (gtk_sink->widget);
+       GST_OBJECT_UNLOCK (gtk_sink);
+ 
+@@ -457,7 +442,7 @@ gst_gtk_base_sink_change_state (GstElement * element, GstStateChange transition)
+     }
+     case GST_STATE_CHANGE_PAUSED_TO_READY:
+       GST_OBJECT_LOCK (gtk_sink);
+-      if (gtk_sink->widget)
++      if (GTK_IS_WIDGET (gtk_sink->widget))
+         gtk_gst_base_widget_set_buffer (gtk_sink->widget, NULL);
+       GST_OBJECT_UNLOCK (gtk_sink);
+       break;
+@@ -503,7 +488,7 @@ gst_gtk_base_sink_set_caps (GstBaseSink * bsink, GstCaps * caps)
+ 
+   GST_OBJECT_LOCK (gtk_sink);
+ 
+-  if (gtk_sink->widget == NULL) {
++  if (!GTK_IS_WIDGET (gtk_sink->widget)) {
+     GST_OBJECT_UNLOCK (gtk_sink);
+     GST_ELEMENT_ERROR (gtk_sink, RESOURCE, NOT_FOUND,
+         ("%s", "Output widget was destroyed"), (NULL));
+@@ -530,7 +515,7 @@ gst_gtk_base_sink_show_frame (GstVideoSink * vsink, GstBuffer * buf)
+ 
+   GST_OBJECT_LOCK (vsink);
+ 
+-  if (gtk_sink->widget == NULL) {
++  if (!GTK_IS_WIDGET (gtk_sink->widget)) {
+     GST_OBJECT_UNLOCK (gtk_sink);
+     GST_ELEMENT_ERROR (gtk_sink, RESOURCE, NOT_FOUND,
+         ("%s", "Output widget was destroyed"), (NULL));
+diff --git a/ext/gtk/gstgtkbasesink.h b/ext/gtk/gstgtkbasesink.h
+index 650175036..f2668fabc 100644
+--- a/ext/gtk/gstgtkbasesink.h
++++ b/ext/gtk/gstgtkbasesink.h
+@@ -69,7 +69,6 @@ struct _GstGtkBaseSink
+   GBinding             *bind_ignore_alpha;
+ 
+   GtkWidget            *window;
+-  gulong               widget_destroy_id;
+   gulong               window_destroy_id;
+ };
+ 
+-- 
+2.26.2
+

pkgs/flatpak/gstreamer-1.0/gst-plugins-good-gtk4glsink-render-black.patch

@@ -0,0 +1,22 @@
+diff --git a/ext/gtk/gtkgstglwidget.c b/ext/gtk/gtkgstglwidget.c
+index 186144a1c..54563c36f 100644
+--- a/ext/gtk/gtkgstglwidget.c
++++ b/ext/gtk/gtkgstglwidget.c
+@@ -173,7 +173,7 @@ _redraw_texture (GtkGstGLWidget * gst_widget, guint tex)
+     GstVideoRectangle src, dst, result;
+     gint widget_width, widget_height, widget_scale;
+ 
+-    gl->ClearColor (0.0, 0.0, 0.0, 0.0);
++    gl->ClearColor (0.0, 0.0, 0.0, 1.0);
+     gl->Clear (GL_COLOR_BUFFER_BIT);
+ 
+     widget_scale = gtk_widget_get_scale_factor ((GtkWidget *) gst_widget);
+@@ -221,7 +221,7 @@ _draw_black (GstGLContext * context)
+   const GstGLFuncs *gl = context->gl_vtable;
+ 
+   gst_gl_insert_debug_marker (context, "no buffer.  rendering black");
+-  gl->ClearColor (0.0, 0.0, 0.0, 0.0);
++  gl->ClearColor (0.0, 0.0, 0.0, 1.0);
+   gl->Clear (GL_COLOR_BUFFER_BIT);
+ }
+ 

pkgs/flatpak/gstreamer-1.0/gst-plugins-good.json

@@ -24,6 +24,14 @@
         {
             "type": "patch",
             "path": "gst-plugins-good-gtk4glsink.patch"
+        },
+        {
+            "type": "patch",
+            "path": "gst-plugins-good-gtk4glsink-render-black.patch"
+        },
+        {
+            "type": "patch",
+            "path": "gst-plugins-good-gtk4-do-not-depend-on-destroy-signal-for-cleanup.patch"
         }
     ]
 }