[gtk/wip/otte/for-master: 1/2] gstmedia: Ensure we prepare files without duration

[Benjamin Otte <otte src gnome org>]

commit 06be1f8b52eb486b3fe0936f935eec9ea12339ef
Author: Benjamin Otte <otte redhat com>
Date:   Mon Mar 29 17:03:33 2021 +0200

    gstmedia: Ensure we prepare files without duration
    
    In particular this fixes playback of images.
    
    Fixes #3810

 modules/media/gtkgstmediafile.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)
---
diff --git a/modules/media/gtkgstmediafile.c b/modules/media/gtkgstmediafile.c
index 6382f3b10a..7edc682e9c 100644
--- a/modules/media/gtkgstmediafile.c
+++ b/modules/media/gtkgstmediafile.c
@@ -126,11 +126,27 @@ g_io_module_query (void)
   return g_strdupv (eps);
 }
 
+static void
+gtk_gst_media_file_ensure_prepared (GtkGstMediaFile *self,
+                                    gint64           duration)
+{
+  if (gtk_media_stream_is_prepared (GTK_MEDIA_STREAM (self)))
+    return;
+
+  gtk_media_stream_prepared (GTK_MEDIA_STREAM (self),
+                             TRUE,
+                             TRUE,
+                             TRUE,
+                             duration);
+}
+
 static void
 gtk_gst_media_file_position_updated_cb (GstPlayer       *player,
                                         GstClockTime     time,
                                         GtkGstMediaFile *self)
 {
+  gtk_gst_media_file_ensure_prepared (self, 0);
+
   gtk_media_stream_update (GTK_MEDIA_STREAM (self), FROM_GST_TIME (time));
 }
 
@@ -139,14 +155,7 @@ gtk_gst_media_file_duration_changed_cb (GstPlayer       *player,
                                         GstClockTime     duration,
                                         GtkGstMediaFile *self)
 {
-  if (gtk_media_stream_is_prepared (GTK_MEDIA_STREAM (self)))
-    return;
-
-  gtk_media_stream_prepared (GTK_MEDIA_STREAM (self),
-                             TRUE,
-                             TRUE,
-                             TRUE,
-                             FROM_GST_TIME (duration));
+  gtk_gst_media_file_ensure_prepared (self, FROM_GST_TIME (duration));
 }
 
 static void
@@ -176,6 +185,8 @@ static void
 gtk_gst_media_file_end_of_stream_cb (GstPlayer       *player,
                                      GtkGstMediaFile *self)
 {
+  gtk_gst_media_file_ensure_prepared (self, 0);
+
   if (gtk_media_stream_get_ended (GTK_MEDIA_STREAM (self)))
     return;