1 files changed, 111 insertions, 0 deletions
diff --git a/dom/media/systemservices/LoadManager.h b/dom/media/systemservices/LoadManager.h
new file mode 100644
index 000000000..96824a308
--- /dev/null
+++ b/dom/media/systemservices/LoadManager.h
@@ -0,0 +1,111 @@
+/* -*- Mode: C++; tab-width: 50; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 _LOADMANAGER_H_
+#define _LOADMANAGER_H_
+
+#include "LoadMonitor.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/Services.h"
+#include "nsTArray.h"
+#include "nsIObserver.h"
+
+#include "webrtc/common_types.h"
+#include "webrtc/video_engine/include/vie_base.h"
+
+extern mozilla::LazyLogModule gLoadManagerLog;
+
+namespace mozilla {
+
+class LoadManagerSingleton : public LoadNotificationCallback,
+                             public webrtc::CPULoadStateCallbackInvoker,
+                             public webrtc::CpuOveruseObserver,
+                             public nsIObserver
+
+{
+public:
+    static LoadManagerSingleton* Get();
+
+    NS_DECL_THREADSAFE_ISUPPORTS
+    NS_DECL_NSIOBSERVER
+
+    // LoadNotificationCallback interface
+    void LoadChanged(float aSystemLoad, float aProcessLoad) override;
+    // CpuOveruseObserver interface
+    // Called as soon as an overuse is detected.
+    void OveruseDetected() override;
+    // Called periodically when the system is not overused any longer.
+    void NormalUsage() override;
+    // CPULoadStateCallbackInvoker interface
+    void AddObserver(webrtc::CPULoadStateObserver * aObserver) override;
+    void RemoveObserver(webrtc::CPULoadStateObserver * aObserver) override;
+
+private:
+    LoadManagerSingleton(bool aEncoderOnly,
+                         int aLoadMeasurementInterval,
+                         int aAveragingMeasurements,
+                         float aHighLoadThreshold,
+                         float aLowLoadThreshold);
+    ~LoadManagerSingleton();
+
+    void LoadHasChanged(webrtc::CPULoadState aNewState);
+
+    RefPtr<LoadMonitor> mLoadMonitor;
+
+    // This protects access to the mObservers list, the current state, and
+    // pretty much all the other members (below).
+    Mutex mLock;
+    nsTArray<webrtc::CPULoadStateObserver*> mObservers;
+    webrtc::CPULoadState mCurrentState;
+    TimeStamp mLastStateChange;
+    float mTimeInState[static_cast<int>(webrtc::kLoadLast)];
+
+    // Set when overuse was signaled to us, and hasn't been un-signaled yet.
+    bool  mOveruseActive;
+    float mLoadSum;
+    int   mLoadSumMeasurements;
+    // Load measurement settings
+    int mLoadMeasurementInterval;
+    int mAveragingMeasurements;
+    float mHighLoadThreshold;
+    float mLowLoadThreshold;
+
+    static StaticRefPtr<LoadManagerSingleton> sSingleton;
+};
+
+class LoadManager final : public webrtc::CPULoadStateCallbackInvoker,
+                          public webrtc::CpuOveruseObserver
+{
+public:
+    explicit LoadManager(LoadManagerSingleton* aManager)
+        : mManager(aManager)
+    {}
+    ~LoadManager() {}
+
+    void AddObserver(webrtc::CPULoadStateObserver * aObserver) override
+    {
+        mManager->AddObserver(aObserver);
+    }
+    void RemoveObserver(webrtc::CPULoadStateObserver * aObserver) override
+    {
+        mManager->RemoveObserver(aObserver);
+    }
+    void OveruseDetected() override
+    {
+        mManager->OveruseDetected();
+    }
+    void NormalUsage() override
+    {
+        mManager->NormalUsage();
+    }
+
+private:
+    RefPtr<LoadManagerSingleton> mManager;
+};
+
+} //namespace
+
+#endif /* _LOADMANAGER_H_ */