[vala/0.52] gstreamer: Update from 1.19.0+ git master

[Rico Tzschichholz <ricotz src gnome org>]

commit ba703fa4e58ed29b7c42c452797f2e4053f3fb16
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue Aug 10 17:08:51 2021 +0200

    gstreamer: Update from 1.19.0+ git master

 vapi/gst-editing-services-1.0.vapi | 4 ++++
 vapi/gstreamer-app-1.0.vapi        | 4 ++++
 2 files changed, 8 insertions(+)
---
diff --git a/vapi/gst-editing-services-1.0.vapi b/vapi/gst-editing-services-1.0.vapi
index df798325f..2f808a8ab 100644
--- a/vapi/gst-editing-services-1.0.vapi
+++ b/vapi/gst-editing-services-1.0.vapi
@@ -510,6 +510,8 @@ namespace GES {
                public Timeline.audio_video ();
                public bool commit ();
                public bool commit_sync ();
+               [Version (since = "1.20")]
+               public void freeze_commit ();
                [CCode (has_construct_function = false)]
                public Timeline.from_uri (string uri) throws GLib.Error;
                public bool get_auto_transition ();
@@ -536,6 +538,8 @@ namespace GES {
                public bool save_to_uri (string uri, GES.Asset? formatter_asset, bool overwrite) throws 
GLib.Error;
                public void set_auto_transition (bool auto_transition);
                public void set_snapping_distance (Gst.ClockTime snapping_distance);
+               [Version (since = "1.20")]
+               public void thaw_commit ();
                public bool auto_transition { get; set; }
                public uint64 duration { get; }
                public uint64 snapping_distance { get; set; }
diff --git a/vapi/gstreamer-app-1.0.vapi b/vapi/gstreamer-app-1.0.vapi
index 887a56cca..b7821b675 100644
--- a/vapi/gstreamer-app-1.0.vapi
+++ b/vapi/gstreamer-app-1.0.vapi
@@ -34,10 +34,14 @@ namespace Gst {
                        public bool wait_on_eos { get; set; }
                        public virtual signal Gst.FlowReturn new_preroll ();
                        public virtual signal Gst.FlowReturn new_sample ();
+                       [Version (since = "1.20")]
+                       public signal bool new_serialized_event ();
                        [HasEmitter]
                        public virtual signal Gst.Sample pull_preroll ();
                        [HasEmitter]
                        public virtual signal Gst.Sample pull_sample ();
+                       [Version (since = "1.20")]
+                       public virtual signal Gst.MiniObject try_pull_object (uint64 timeout);
                        [HasEmitter]
                        [Version (since = "1.10")]
                        public virtual signal Gst.Sample try_pull_preroll (uint64 timeout);