1 files changed, 143 insertions, 0 deletions
diff --git a/dom/media/FrameStatistics.h b/dom/media/FrameStatistics.h
new file mode 100644
index 000000000..e7d382629
--- /dev/null
+++ b/dom/media/FrameStatistics.h
@@ -0,0 +1,143 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 FrameStatistics_h_
+#define FrameStatistics_h_
+
+#include "mozilla/ReentrantMonitor.h"
+
+namespace mozilla {
+
+struct FrameStatisticsData
+{
+  // Number of frames parsed and demuxed from media.
+  // Access protected by mReentrantMonitor.
+  uint64_t mParsedFrames = 0;
+
+  // Number of parsed frames which were actually decoded.
+  // Access protected by mReentrantMonitor.
+  uint64_t mDecodedFrames = 0;
+
+  // Number of decoded frames which were actually sent down the rendering
+  // pipeline to be painted ("presented"). Access protected by mReentrantMonitor.
+  uint64_t mPresentedFrames = 0;
+
+  // Number of frames that have been skipped because they have missed their
+  // composition deadline.
+  uint64_t mDroppedFrames = 0;
+
+  // Sum of all inter-keyframe segment durations, in microseconds.
+  // Dividing by count will give the average inter-keyframe time.
+  uint64_t mInterKeyframeSum_us = 0;
+  // Number of inter-keyframe segments summed so far.
+  size_t mInterKeyframeCount = 0;
+
+  // Maximum inter-keyframe segment duration, in microseconds.
+  uint64_t mInterKeyFrameMax_us = 0;
+
+  FrameStatisticsData() = default;
+  FrameStatisticsData(uint64_t aParsed, uint64_t aDecoded, uint64_t aDropped)
+    : mParsedFrames(aParsed)
+    , mDecodedFrames(aDecoded)
+    , mDroppedFrames(aDropped)
+  {}
+
+  void
+  Accumulate(const FrameStatisticsData& aStats)
+  {
+    mParsedFrames += aStats.mParsedFrames;
+    mDecodedFrames += aStats.mDecodedFrames;
+    mPresentedFrames += aStats.mPresentedFrames;
+    mDroppedFrames += aStats.mDroppedFrames;
+    mInterKeyframeSum_us += aStats.mInterKeyframeSum_us;
+    mInterKeyframeCount += aStats.mInterKeyframeCount;
+    // It doesn't make sense to add max numbers, instead keep the bigger one.
+    if (mInterKeyFrameMax_us < aStats.mInterKeyFrameMax_us) {
+      mInterKeyFrameMax_us = aStats.mInterKeyFrameMax_us;
+    }
+  }
+};
+
+// Frame decoding/painting related performance counters.
+// Threadsafe.
+class FrameStatistics
+{
+public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(FrameStatistics);
+
+  FrameStatistics()
+    : mReentrantMonitor("FrameStats")
+  {}
+
+  // Returns a copy of all frame statistics data.
+  // Can be called on any thread.
+  FrameStatisticsData GetFrameStatisticsData() const
+  {
+    ReentrantMonitorAutoEnter mon(mReentrantMonitor);
+    return mFrameStatisticsData;
+  }
+
+  // Returns number of frames which have been parsed from the media.
+  // Can be called on any thread.
+  uint64_t GetParsedFrames() const
+  {
+    ReentrantMonitorAutoEnter mon(mReentrantMonitor);
+    return mFrameStatisticsData.mParsedFrames;
+  }
+
+  // Returns the number of parsed frames which have been decoded.
+  // Can be called on any thread.
+  uint64_t GetDecodedFrames() const
+  {
+    ReentrantMonitorAutoEnter mon(mReentrantMonitor);
+    return mFrameStatisticsData.mDecodedFrames;
+  }
+
+  // Returns the number of decoded frames which have been sent to the rendering
+  // pipeline for painting ("presented").
+  // Can be called on any thread.
+  uint64_t GetPresentedFrames() const
+  {
+    ReentrantMonitorAutoEnter mon(mReentrantMonitor);
+    return mFrameStatisticsData.mPresentedFrames;
+  }
+
+  // Returns the number of frames that have been skipped because they have
+  // missed their composition deadline.
+  uint64_t GetDroppedFrames() const
+  {
+    ReentrantMonitorAutoEnter mon(mReentrantMonitor);
+    return mFrameStatisticsData.mDroppedFrames;
+  }
+
+  // Increments the parsed and decoded frame counters by the passed in counts.
+  // Can be called on any thread.
+  void NotifyDecodedFrames(const FrameStatisticsData& aStats)
+  {
+    ReentrantMonitorAutoEnter mon(mReentrantMonitor);
+    mFrameStatisticsData.Accumulate(aStats);
+  }
+
+  // Increments the presented frame counters.
+  // Can be called on any thread.
+  void NotifyPresentedFrame()
+  {
+    ReentrantMonitorAutoEnter mon(mReentrantMonitor);
+    ++mFrameStatisticsData.mPresentedFrames;
+  }
+
+private:
+  ~FrameStatistics() {}
+
+  // ReentrantMonitor to protect access of playback statistics.
+  mutable ReentrantMonitor mReentrantMonitor;
+
+  FrameStatisticsData mFrameStatisticsData;
+};
+
+} // namespace mozilla
+
+#endif // FrameStatistics_h_