python: Convert buffer metadata API to use @property decorators

Convert buffer metadata getter/setter methods to Python properties for
more intuitive access. This makes the API more Pythonic by allowing
direct property assignment (buf.pts = 42) instead of method calls
(buf.set_pts(42)).

Updated properties: flags, pts, dts, duration, offset, offset_end

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9134>

subprojects/gst-python/gi/overrides/Gst.py

@@ -124,10 +124,12 @@ class MiniObject:
     def is_writable(self):
         return _gi_gst.mini_object_is_writable(self)
 
+    @property
     def flags(self):
         return _gi_gst.mini_object_flags(self)
 
-    def set_flags(self, flags):
+    @flags.setter
+    def flags(self, flags):
         _gi_gst.mini_object_set_flags(self, flags)
 
 
@@ -170,6 +172,7 @@ class Event(Gst.Event, MiniObject):
 Event = override(Event)
 __all__.append('Event')
 
+
 class NotWritableContext(Exception):
     pass
 
@@ -891,40 +894,52 @@ __all__.append("MapInfo")
 
 
 class Buffer(Gst.Buffer, MiniObject):
+    @property
     def flags(self):
-        return MiniObject.flags(self)
+        return _gi_gst.mini_object_flags(self)
 
-    def set_flags(self, flags):
-        return MiniObject.set_flags(self, flags)
+    @flags.setter
+    def flags(self, flags):
+        _gi_gst.mini_object_set_flags(self, flags)
 
+    @property
     def dts(self):
         return _gi_gst.buffer_get_dts(self)
 
-    def set_dts(self, dts):
+    @dts.setter
+    def dts(self, dts):
         _gi_gst.buffer_set_dts(self, dts)
 
+    @property
     def pts(self):
         return _gi_gst.buffer_get_pts(self)
 
-    def set_pts(self, pts):
+    @pts.setter
+    def pts(self, pts):
         _gi_gst.buffer_set_pts(self, pts)
 
-    def set_duration(self, duration):
-        _gi_gst.buffer_set_duration(self, duration)
-
+    @property
     def duration(self):
         return _gi_gst.buffer_get_duration(self)
 
+    @duration.setter
+    def duration(self, duration):
+        _gi_gst.buffer_set_duration(self, duration)
+
+    @property
     def offset(self):
         return _gi_gst.buffer_get_offset(self)
 
-    def set_offset(self, offset):
+    @offset.setter
+    def offset(self, offset):
         _gi_gst.buffer_set_offset(self, offset)
 
+    @property
     def offset_end(self):
         return _gi_gst.buffer_get_offset_end(self)
 
-    def set_offset_end(self, offset_end):
+    @offset_end.setter
+    def offset_end(self, offset_end):
         _gi_gst.buffer_set_offset_end(self, offset_end)
 
     def map_range(self, idx, length, flags):

subprojects/gst-python/testsuite/test_gst.py

@@ -16,16 +16,16 @@
 # You should have received a copy of the GNU Lesser General Public
 # License along with this library; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+import overrides_hack
+import sys
+from common import TestCase, unittest
+from gi.repository import Gst
 import gi
 
 
 gi.require_version('Gst', '1.0')
 
 
-from gi.repository import Gst
-from common import TestCase, unittest
-import sys
-import overrides_hack
 overrides_hack
 
 
@@ -220,6 +220,7 @@ class TestQuery(TestCase):
             self.assertEqual(s["rate"], 44100)
             self.assertEqual(s["channels"], 2)
 
+
 class TestContext(TestCase):
     def test_writable(self):
         Gst.init(None)
@@ -244,24 +245,24 @@ class TestBuffer(TestCase):
     def test_set_metas(self):
         Gst.init(None)
         buf = Gst.Buffer.new_wrapped([42])
-        buf.set_pts(42)
-        self.assertEqual(buf.pts(), 42)
+        buf.pts = 42
+        self.assertEqual(buf.pts, 42)
 
         make_not_writable = buf.mini_object
         with self.assertRaises(Gst.NotWritableMiniObject):
-            buf.set_pts(52)
+            buf.pts = 52
 
         buf.make_writable()
-        buf.set_dts(62)
-        self.assertEqual(buf.dts(), 62)
-        self.assertTrue(buf.flags() & Gst.BufferFlags.DISCONT == 0)
-        buf.set_flags(Gst.BufferFlags.DISCONT)
-        buf.set_duration(72)
-        self.assertEqual(buf.duration(), 72)
-        buf.set_offset(82)
-        self.assertEqual(buf.offset(), 82)
-        buf.set_offset_end(92)
-        self.assertEqual(buf.offset_end(), 92)
+        buf.dts = 62
+        self.assertEqual(buf.dts, 62)
+        self.assertTrue(buf.flags & Gst.BufferFlags.DISCONT == 0)
+        buf.flags = Gst.BufferFlags.DISCONT
+        buf.duration = 72
+        self.assertEqual(buf.duration, 72)
+        buf.offset = 82
+        self.assertEqual(buf.offset, 82)
+        buf.offset_end = 92
+        self.assertEqual(buf.offset_end, 92)
         del make_not_writable
 
         meta = buf.add_reference_timestamp_meta(Gst.Caps("yes"), 10, 10)