ges: Do not recreate auto-transitions when changing clip assets

Otherwise we loose the configuration of the auto transition, and
it is not required at all in any case.

Fixes https://gitlab.gnome.org/GNOME/pitivi/-/issues/2380

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-editing-services/-/merge_requests/208>

ges/ges-auto-transition.c

@@ -104,6 +104,11 @@ static void
 _track_changed_cb (GESTrackElement * track_element,
     GParamSpec * arg G_GNUC_UNUSED, GESAutoTransition * self)
 {
+  if (self->frozen) {
+    GST_LOG_OBJECT (self, "Not updating because frozen");
+    return;
+  }
+
   if (ges_track_element_get_track (track_element) == NULL) {
     GST_DEBUG_OBJECT (self, "Neighboor %" GST_PTR_FORMAT
         " removed from track ... auto destructing", track_element);
@@ -134,11 +139,15 @@ _disconnect_from_source (GESAutoTransition * self, GESTrackElement * source)
 }
 
 void
-ges_auto_transition_set_previous_source (GESAutoTransition * self,
-    GESTrackElement * source)
+ges_auto_transition_set_source (GESAutoTransition * self,
+    GESTrackElement * source, GESEdge edge)
 {
   _disconnect_from_source (self, self->previous_source);
   _connect_to_source (self, source);
+
+  if (edge == GES_EDGE_END)
+    self->next_source = source;
+  else
     self->previous_source = source;
 }
 

ges/ges-clip.c

@@ -3491,11 +3491,12 @@ ges_clip_split_full (GESClip * clip, guint64 position, GError ** error)
           gst_object_ref (track));
 
     trans = timeline ?
-        ges_timeline_get_auto_transition_at_end (timeline, orig) : NULL;
+        ges_timeline_get_auto_transition_at_edge (timeline, orig,
+        GES_EDGE_END) : NULL;
 
     if (trans) {
       trans->frozen = TRUE;
-      ges_auto_transition_set_previous_source (trans, copy);
+      ges_auto_transition_set_source (trans, copy, GES_EDGE_START);
       transitions = g_list_append (transitions, trans);
     }
   }

ges/ges-internal.h

@@ -112,7 +112,8 @@ G_GNUC_INTERNAL void
 ges_timeline_freeze_auto_transitions (GESTimeline * timeline, gboolean freeze);
 
 G_GNUC_INTERNAL GESAutoTransition *
-ges_timeline_get_auto_transition_at_end (GESTimeline * timeline, GESTrackElement * source);
+ges_timeline_get_auto_transition_at_edge (GESTimeline * timeline, GESTrackElement * source,
+  GESEdge edge);
 
 G_GNUC_INTERNAL gboolean ges_timeline_is_disposed (GESTimeline* timeline);
 
@@ -183,7 +184,7 @@ G_GNUC_INTERNAL gboolean
 ges_timeline_get_smart_rendering (GESTimeline *timeline);
 
 G_GNUC_INTERNAL void
-ges_auto_transition_set_previous_source (GESAutoTransition * self, GESTrackElement * source);
+ges_auto_transition_set_source (GESAutoTransition * self, GESTrackElement * source, GESEdge edge);
 
 
 

ges/ges-timeline-tree.c

@@ -2368,9 +2368,8 @@ create_transition_if_needed (GESTimeline * timeline, GESTrackElement * prev,
     ges_timeline_create_transition (timeline, prev, next, NULL, layer,
         _START (next), duration);
   } else {
-    GST_INFO ("Already have transition %" GES_FORMAT " between %" GES_FORMAT
-        " and %" GES_FORMAT, GES_ARGS (trans), GES_ARGS (prev),
-        GES_ARGS (next));
+    GST_INFO ("Already have transition %" GST_PTR_FORMAT " between %" GES_FORMAT
+        " and %" GES_FORMAT, trans, GES_ARGS (prev), GES_ARGS (next));
   }
 }
 

ges/ges-timeline.c

@@ -1074,8 +1074,8 @@ ges_timeline_find_auto_transition (GESTimeline * timeline,
 }
 
 GESAutoTransition *
-ges_timeline_get_auto_transition_at_end (GESTimeline * timeline,
-    GESTrackElement * source)
+ges_timeline_get_auto_transition_at_edge (GESTimeline * timeline,
+    GESTrackElement * source, GESEdge edge)
 {
   GList *tmp, *auto_transitions;
   GESAutoTransition *ret = NULL;
@@ -1090,7 +1090,10 @@ ges_timeline_get_auto_transition_at_end (GESTimeline * timeline,
 
     /* We already have a transition linked to one of the elements we want to
      * find a transition for */
-    if (auto_trans->previous_source == source) {
+    if (edge == GES_EDGE_END && auto_trans->previous_source == source) {
+      ret = gst_object_ref (auto_trans);
+      break;
+    } else if (edge == GES_EDGE_START && auto_trans->next_source == source) {
       ret = gst_object_ref (auto_trans);
       break;
     }

ges/ges-uri-clip.c

@@ -224,6 +224,27 @@ extractable_get_id (GESExtractable * self)
   return g_strdup (GES_URI_CLIP (self)->priv->uri);
 }
 
+static GList *
+get_auto_transitions_around_source (GESTrackElement * child)
+{
+  GList *transitions = NULL;
+  GESTimeline *timeline = GES_TIMELINE_ELEMENT_TIMELINE (child);
+  gint i;
+  GESEdge edges[] = { GES_EDGE_START, GES_EDGE_END };
+
+  if (!timeline)
+    return NULL;
+
+  for (i = 0; i < G_N_ELEMENTS (edges); i++) {
+    GESAutoTransition *transition =
+        ges_timeline_get_auto_transition_at_edge (timeline, child, edges[i]);
+    if (transition)
+      transitions = g_list_prepend (transitions, transition);
+  }
+
+  return transitions;
+}
+
 static gboolean
 extractable_set_asset (GESExtractable * self, GESAsset * asset)
 {
@@ -235,9 +256,11 @@ extractable_set_asset (GESExtractable * self, GESAsset * asset)
   GESTimelineElement *element = GES_TIMELINE_ELEMENT (self);
   GESLayer *layer = ges_clip_get_layer (clip);
   GList *tmp, *children;
-  GHashTable *source_by_track;
+  GHashTable *source_by_track, *auto_transitions_on_sources;
   GstClockTime max_duration;
   GESAsset *prev_asset;
+  GList *transitions = NULL;
+  GESTimeline *timeline = GES_TIMELINE_ELEMENT_TIMELINE (self);
 
   g_return_val_if_fail (GES_IS_URI_CLIP_ASSET (asset), FALSE);
 
@@ -300,24 +323,37 @@ extractable_set_asset (GESExtractable * self, GESAsset * asset)
 
   source_by_track = g_hash_table_new_full (NULL, NULL,
       gst_object_unref, gst_object_unref);
-  children = ges_container_get_children (container, FALSE);
+  auto_transitions_on_sources = g_hash_table_new_full (NULL, NULL,
+      gst_object_unref, (GDestroyNotify) g_list_free);
 
+  if (timeline)
+    ges_timeline_freeze_auto_transitions (timeline, TRUE);
+
+  children = ges_container_get_children (container, FALSE);
   for (tmp = children; tmp; tmp = tmp->next) {
     GESTrackElement *child = tmp->data;
-    GESTrack *track = ges_track_element_get_track (child);
+    GESTrack *track;
+
     /* remove our core children */
-    if (ges_track_element_is_core (child)) {
+    if (!ges_track_element_is_core (child))
+      continue;
+
+    track = ges_track_element_get_track (child);
     if (track)
       g_hash_table_insert (source_by_track, gst_object_ref (track),
           gst_object_ref (child));
 
+    transitions = get_auto_transitions_around_source (child);
+    if (transitions)
+      g_hash_table_insert (auto_transitions_on_sources, gst_object_ref (child),
+          transitions);
+
     /* removing the track element from its clip whilst it is in a
      * timeline will remove it from its track */
     /* removing the core element will also empty its non-core siblings
      * from the same track */
     ges_container_remove (container, GES_TIMELINE_ELEMENT (child));
   }
-  }
   g_list_free_full (children, g_object_unref);
 
   contains_core = FALSE;
@@ -343,17 +379,32 @@ extractable_set_asset (GESExtractable * self, GESAsset * asset)
        * the same source! */
       for (tmp = container->children; tmp; tmp = tmp->next) {
         GESTrackElement *child = tmp->data;
-        if (ges_track_element_is_core (child)) {
-          GESTrackElement *orig_source = g_hash_table_lookup (source_by_track,
-              ges_track_element_get_track (child));
-          contains_core = TRUE;
+        GESTrackElement *orig_source;
+
+        if (!ges_track_element_is_core (child))
+          continue;
+
+        contains_core = TRUE;
+        orig_source = g_hash_table_lookup (source_by_track,
+            ges_track_element_get_track (child));
+
+        if (!orig_source)
+          continue;
 
-          if (orig_source) {
         ges_track_element_copy_properties (GES_TIMELINE_ELEMENT
             (orig_source), GES_TIMELINE_ELEMENT (child));
         ges_track_element_copy_bindings (orig_source, child,
             GST_CLOCK_TIME_NONE);
-          }
+
+        transitions =
+            g_hash_table_lookup (auto_transitions_on_sources, orig_source);
+        for (; transitions; transitions = transitions->next) {
+          GESAutoTransition *transition = transitions->data;
+
+          if (transition->previous_source == orig_source)
+            ges_auto_transition_set_source (transition, child, GES_EDGE_START);
+          else if (transition->next_source == orig_source)
+            ges_auto_transition_set_source (transition, child, GES_EDGE_END);
         }
       }
     } else {
@@ -363,6 +414,10 @@ extractable_set_asset (GESExtractable * self, GESAsset * asset)
     gst_object_unref (layer);
   }
   g_hash_table_unref (source_by_track);
+  g_hash_table_unref (auto_transitions_on_sources);
+
+  if (timeline)
+    ges_timeline_freeze_auto_transitions (timeline, FALSE);
 
   if (res) {
     g_free (uriclip->priv->uri);

tests/check/python/common.py

@@ -32,6 +32,12 @@ import os  #noqa
 import unittest  # noqa
 import tempfile  # noqa
 
+try:
+    gi.require_version("GstTranscoder", "1.0")
+    from gi.repository import GstTranscoder
+except ValueError:
+    GstTranscoder = None
+
 Gst.init(None)
 GES.init()
 
@@ -99,6 +105,28 @@ def created_project_file(xges):
     os.remove(xges_path)
 
 
+def can_generate_assets():
+    if GstTranscoder is None:
+        return False, "GstTranscoder is not available"
+
+    if not Gst.ElementFactory.make("testsrcbin"):
+        return False, "testbinsrc is not available"
+
+    return True, None
+
+
+@contextlib.contextmanager
+def created_video_asset(uri=None, num_bufs=30):
+    with tempfile.NamedTemporaryFile(suffix=".ogg") as f:
+        if not uri:
+            uri = Gst.filename_to_uri(f.name)
+        transcoder = GstTranscoder.Transcoder.new("testbin://video,num-buffers=%s" % num_bufs,
+            uri, "application/ogg:video/x-theora:audio/x-vorbis")
+        transcoder.run()
+
+        yield uri
+
+
 def get_asset_uri(name):
     python_tests_dir = os.path.dirname(os.path.abspath(__file__))
     assets_dir = os.path.join(python_tests_dir, "..", "assets")
@@ -217,7 +245,11 @@ class GESSimpleTimelineTest(GESTest):
         while len(self.timeline.get_layers()) < layer + 1:
             self.timeline.append_layer()
         layer = self.timeline.get_layers()[layer]
-        clip = GES.Asset.request(asset_type, asset_id).extract()
+        if asset_type == GES.UriClip:
+            asset = GES.UriClipAsset.request_sync(asset_id)
+        else:
+            asset = GES.Asset.request(asset_type, asset_id)
+        clip = asset.extract()
         clip.props.start = layer.get_duration()
         clip.props.duration = 10
         self.assertTrue(layer.add_clip(clip))

tests/check/python/test_assets.py

@@ -32,12 +32,6 @@ from gi.repository import GES  # noqa
 import unittest  # noqa
 from unittest import mock
 
-try:
-    gi.require_version("GstTranscoder", "1.0")
-    from gi.repository import GstTranscoder
-except ValueError:
-    GstTranscoder = None
-
 from . import common
 from .common import GESSimpleTimelineTest  # noqa
 
@@ -66,30 +60,19 @@ class TestTimeline(GESSimpleTimelineTest):
         asset = proj.create_asset_sync("file:///png.png", GES.UriClip)
         self.assertIsNotNone(asset)
 
-    @unittest.skipIf(GstTranscoder is None, "GstTranscoder is not available")
-    @unittest.skipIf(Gst.ElementFactory.make("testsrcbin") is None, "testbinsrc is not available")
+    @unittest.skipUnless(*common.can_generate_assets())
     def test_reload_asset(self):
-        with tempfile.NamedTemporaryFile(suffix=".ogg") as f:
-            uri = Gst.filename_to_uri(f.name)
-            transcoder = GstTranscoder.Transcoder.new("testbin://video,num-buffers=30",
-                uri, "application/ogg:video/x-theora:audio/x-vorbis")
-            transcoder.run()
-
+        with common.created_video_asset() as uri:
             asset0 = GES.UriClipAsset.request_sync(uri)
             self.assertEqual(asset0.props.duration, Gst.SECOND)
 
-            transcoder = GstTranscoder.Transcoder.new("testbin://video,num-buffers=60",
-                uri, "application/ogg:video/x-theora:audio/x-vorbis")
-            transcoder.run()
-
+            with common.created_video_asset(uri, 60) as uri:
                 GES.Asset.needs_reload(GES.UriClip, uri)
                 asset1 = GES.UriClipAsset.request_sync(uri)
                 self.assertEqual(asset1.props.duration, 2 * Gst.SECOND)
                 self.assertEqual(asset1, asset0)
 
-            transcoder = GstTranscoder.Transcoder.new("testbin://video,num-buffers=90",
-                uri, "application/ogg:video/x-theora:audio/x-vorbis")
-            transcoder.run()
+                with common.created_video_asset(uri, 90) as uri:
                     mainloop = common.create_main_loop()
                     def asset_loaded_cb(_, res, mainloop):
                         asset2 = GES.Asset.request_finish(res)

tests/check/python/test_timeline.py

@@ -201,6 +201,29 @@ class TestTimeline(common.GESSimpleTimelineTest):
             ]
         ])
 
+    @unittest.skipUnless(*common.can_generate_assets())
+    def test_auto_transition_type_after_setting_proxy_asset(self):
+        self.track_types = [GES.TrackType.VIDEO]
+        super().setUp()
+
+        self.timeline.props.auto_transition = True
+        with common.created_video_asset() as uri:
+            self.append_clip(asset_type=GES.UriClip, asset_id=uri)
+            self.append_clip(asset_type=GES.UriClip, asset_id=uri).props.start = 5
+            clip1, transition, clip2 = self.layer.get_clips()
+            video_transition, = transition.get_children(True)
+            video_transition.set_transition_type(GES.VideoStandardTransitionType.BAR_WIPE_LR)
+            self.assertEqual(video_transition.get_transition_type(), GES.VideoStandardTransitionType.BAR_WIPE_LR)
+
+            with common.created_video_asset() as uri2:
+                proxy_asset = GES.UriClipAsset.request_sync(uri2)
+                clip1.set_asset(proxy_asset)
+                clip1, transition1, clip2 = self.layer.get_clips()
+
+                video_transition1, = transition1.get_children(True)
+                self.assertEqual(video_transition, video_transition1)
+                self.assertEqual(video_transition.get_transition_type(), GES.VideoStandardTransitionType.BAR_WIPE_LR)
+
     def test_frame_info(self):
         self.track_types = [GES.TrackType.VIDEO]
         super().setUp()
@@ -345,12 +368,10 @@ class TestEditing(common.GESSimpleTimelineTest):
 
         def _snapped_cb(timeline, elem1, elem2, position):
             self.snapped_at.append(position)
-            Gst.error('%s' % position)
 
         def _snapped_end_cb(timeline, elem1, elem2, position):
             if self.snapped_at:  # Ignoring first snap end.
                 self.snapped_at.append(Gst.CLOCK_TIME_NONE)
-                Gst.error('%s' % position)
 
         self.timeline.connect("snapping-started", _snapped_cb)
         self.timeline.connect("snapping-ended", _snapped_end_cb)