File gst-plugins-base-decodebin3-collection-identity-check.patch of Package gstreamer-plugins-base

From 378e78f285a3f14c0c53473948090464fa48147b Mon Sep 17 00:00:00 2001
From: Edward Hervey <edward@centricular.com>
Date: Wed, 21 Aug 2024 16:29:03 +0200
Subject: [PATCH] decodebin3: Fix collection identity check

Collections can be auto-generated from upstream and yet have exactly the same
streams in it.

Therefore do a more in-depth check for equality.

Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3742
---
 .../gst/playback/gstdecodebin3.c              | 26 ++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/gst/playback/gstdecodebin3.c b/gst/playback/gstdecodebin3.c
index 56ef496468ac..78b79c776ba6 100644
--- a/gst/playback/gstdecodebin3.c
+++ b/gst/playback/gstdecodebin3.c
@@ -2609,6 +2609,29 @@ db_collection_new (GstStreamCollection * collection)
   return db_collection;
 }
 
+static gboolean
+collections_are_identical (GstStreamCollection * collection,
+    GstStreamCollection * previous)
+{
+  guint i;
+
+  if (collection == previous)
+    return TRUE;
+
+  if (gst_stream_collection_get_size (collection) !=
+      gst_stream_collection_get_size (previous))
+    return FALSE;
+
+  for (i = 0; i < gst_stream_collection_get_size (previous); i++) {
+    GstStream *stream = gst_stream_collection_get_stream (previous, i);
+    const gchar *sid = gst_stream_get_stream_id (stream);
+    if (!stream_in_collection (collection, (gchar *) sid))
+      return FALSE;
+  }
+
+  return TRUE;
+}
+
 /** handle_stream_collection_locked:
  * @dbin:
  * @collection: (transfer none): The new collection for @input. Can be %NULL.
@@ -2683,12 +2706,13 @@ handle_stream_collection_locked (GstDecodebin3 * dbin,
   if (dbin->input_collection) {
     GstStreamCollection *previous = dbin->input_collection->collection;
 
-    if (collection == previous) {
+    if (collections_are_identical (collection, previous)) {
       GST_DEBUG_OBJECT (dbin, "Collection didn't change");
       gst_object_unref (collection);
       SELECTION_UNLOCK (dbin);
       return NULL;
     }
+
     /* Check if this collection is an update of the previous one */
     if (gst_stream_collection_get_size (collection) >
         gst_stream_collection_get_size (previous)) {
-- 
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