1 files changed, 83 insertions, 0 deletions
diff --git a/dom/media/systemservices/MediaSystemResourceService.h b/dom/media/systemservices/MediaSystemResourceService.h
new file mode 100644
index 0000000000..8a75a6cafd
--- /dev/null
+++ b/dom/media/systemservices/MediaSystemResourceService.h
@@ -0,0 +1,83 @@
+/* -*- 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/. */
+
+#if !defined(MediaSystemResourceService_h_)
+#  define MediaSystemResourceService_h_
+
+#  include <deque>
+
+#  include "MediaSystemResourceTypes.h"
+#  include "mozilla/StaticPtr.h"
+#  include "nsClassHashtable.h"
+
+namespace mozilla {
+
+namespace media {
+class MediaSystemResourceManagerParent;
+}  // namespace media
+
+/**
+ * Manage media system resource allocation requests within system.
+ */
+class MediaSystemResourceService {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MediaSystemResourceService)
+
+  static MediaSystemResourceService* Get();
+  static void Init();
+  static void Shutdown();
+
+  void Acquire(media::MediaSystemResourceManagerParent* aParent, uint32_t aId,
+               MediaSystemResourceType aResourceType, bool aWillWait);
+
+  void ReleaseResource(media::MediaSystemResourceManagerParent* aParent,
+                       uint32_t aId, MediaSystemResourceType aResourceType);
+
+  void ReleaseResource(media::MediaSystemResourceManagerParent* aParent);
+
+ private:
+  MediaSystemResourceService();
+  ~MediaSystemResourceService();
+
+  struct MediaSystemResourceRequest {
+    MediaSystemResourceRequest() : mParent(nullptr), mId(-1) {}
+    MediaSystemResourceRequest(media::MediaSystemResourceManagerParent* aParent,
+                               uint32_t aId)
+        : mParent(aParent), mId(aId) {}
+    media::MediaSystemResourceManagerParent* mParent;
+    uint32_t mId;
+  };
+
+  struct MediaSystemResource {
+    MediaSystemResource() : mResourceCount(0) {}
+    explicit MediaSystemResource(uint32_t aResourceCount)
+        : mResourceCount(aResourceCount) {}
+
+    std::deque<MediaSystemResourceRequest> mWaitingRequests;
+    std::deque<MediaSystemResourceRequest> mAcquiredRequests;
+    uint32_t mResourceCount;
+  };
+
+  void Destroy();
+
+  void RemoveRequest(media::MediaSystemResourceManagerParent* aParent,
+                     uint32_t aId, MediaSystemResourceType aResourceType);
+
+  void RemoveRequests(media::MediaSystemResourceManagerParent* aParent,
+                      MediaSystemResourceType aResourceType);
+
+  void UpdateRequests(MediaSystemResourceType aResourceType);
+
+  bool mDestroyed;
+
+  nsClassHashtable<nsUint32HashKey, MediaSystemResource> mResources;
+
+  static StaticRefPtr<MediaSystemResourceService> sSingleton;
+};
+
+}  // namespace mozilla
+
+#endif