Add deprecation warnings

src/wagtailmedia/deprecation.py

@@ -1,6 +1,6 @@
-class RemovedInWagtailMedia015Warning(PendingDeprecationWarning):
+class RemovedInWagtailMedia016Warning(PendingDeprecationWarning):
     pass
 
 
-class RemovedInWagtailMedia016Warning(DeprecationWarning):
+class RemovedInWagtailMedia017Warning(DeprecationWarning):
     pass

src/wagtailmedia/edit_handlers.py

@@ -1,11 +1,14 @@
 from __future__ import annotations
 
+import warnings
+
 from typing import TYPE_CHECKING
 
 from django.template.loader import render_to_string
 from wagtail.admin.compare import ForeignObjectComparison
 from wagtail.admin.panels import FieldPanel
 
+from .deprecation import RemovedInWagtailMedia017Warning
 from .models import MediaType
 from .utils import format_audio_html, format_video_html
 from .widgets import AdminAudioChooser, AdminMediaChooser, AdminVideoChooser
@@ -23,6 +26,26 @@ def __init__(self, field_name, *args, media_type=None, **kwargs):
 
         self.media_type = media_type
 
+        if self.media_type is None:
+            warnings.warn(
+                (
+                    "The `MediaChooserPanel` field panel is deprecated. "
+                    "Please use the `FieldPanel()` instead."
+                ),
+                RemovedInWagtailMedia017Warning,
+                stacklevel=2,
+            )
+        else:
+            warnings.warn(
+                (
+                    "The `MediaChooserPanel` field panel is deprecated. Please use the "
+                    "specialised `AudioChooserPanel()` for audio only "
+                    "and `VideoChooserPanel()` for video only."
+                ),
+                RemovedInWagtailMedia017Warning,
+                stacklevel=2,
+            )
+
     def clone_kwargs(self):
         kwargs = super().clone_kwargs()
         kwargs.update(media_type=self.media_type)

src/wagtailmedia/views/viewsets.py

@@ -1,6 +1,5 @@
 from django.utils.functional import cached_property
 from django.utils.translation import gettext_lazy as _
-
 from wagtail.admin.ui.tables import Column
 from wagtail.admin.views.generic.chooser import (
     ChooseResultsView,