1 files changed, 97 insertions, 0 deletions
diff --git a/dom/media/mediasession/MediaMetadata.h b/dom/media/mediasession/MediaMetadata.h
new file mode 100644
index 0000000000..6c552e6465
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+++ b/dom/media/mediasession/MediaMetadata.h
@@ -0,0 +1,97 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_MediaMetadata_h
+#define mozilla_dom_MediaMetadata_h
+
+#include "js/TypeDecls.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/MediaSessionBinding.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsWrapperCache.h"
+
+class nsIGlobalObject;
+
+namespace mozilla {
+class ErrorResult;
+
+namespace dom {
+
+class MediaMetadataBase {
+ public:
+  MediaMetadataBase() = default;
+  MediaMetadataBase(const nsString& aTitle, const nsString& aArtist,
+                    const nsString& aAlbum)
+      : mTitle(aTitle), mArtist(aArtist), mAlbum(aAlbum) {}
+
+  static MediaMetadataBase EmptyData() { return MediaMetadataBase(); }
+
+  nsString mTitle;
+  nsString mArtist;
+  nsString mAlbum;
+  CopyableTArray<MediaImage> mArtwork;
+};
+
+class MediaMetadata final : public nsISupports,
+                            public nsWrapperCache,
+                            private MediaMetadataBase {
+ public:
+  // Ref counting and cycle collection
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(MediaMetadata)
+
+  // WebIDL methods
+  nsIGlobalObject* GetParentObject() const;
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  static already_AddRefed<MediaMetadata> Constructor(
+      const GlobalObject& aGlobal, const MediaMetadataInit& aInit,
+      ErrorResult& aRv);
+
+  void GetTitle(nsString& aRetVal) const;
+
+  void SetTitle(const nsAString& aTitle);
+
+  void GetArtist(nsString& aRetVal) const;
+
+  void SetArtist(const nsAString& aArtist);
+
+  void GetAlbum(nsString& aRetVal) const;
+
+  void SetAlbum(const nsAString& aAlbum);
+
+  void GetArtwork(JSContext* aCx, nsTArray<JSObject*>& aRetVal,
+                  ErrorResult& aRv) const;
+
+  void SetArtwork(JSContext* aCx, const Sequence<JSObject*>& aArtwork,
+                  ErrorResult& aRv);
+
+  // This would expose MediaMetadataBase's members as public, so use this method
+  // carefully. Now we only use this when we want to update the metadata to the
+  // media session controller in the chrome process.
+  MediaMetadataBase* AsMetadataBase() { return this; }
+
+ private:
+  MediaMetadata(nsIGlobalObject* aParent, const nsString& aTitle,
+                const nsString& aArtist, const nsString& aAlbum);
+
+  ~MediaMetadata() = default;
+
+  // Perform `convert artwork algorithm`. Set `mArtwork` to a converted
+  // `aArtwork` if the conversion works, otherwise throw a type error in `aRv`.
+  void SetArtworkInternal(const Sequence<MediaImage>& aArtwork,
+                          ErrorResult& aRv);
+
+  nsCOMPtr<nsIGlobalObject> mParent;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_MediaMetadata_h