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/* -*- 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 */
#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 parsed frames which were dropped in the decoder.
// Access protected by mReentrantMonitor.
uint64_t mDroppedDecodedFrames = 0;
// Number of decoded frames which were dropped in the sink
// Access protected by mReentrantMonitor.
uint64_t mDroppedSinkFrames = 0;
// Number of sinked frames which were dropped in the compositor
// Access protected by mReentrantMonitor.
uint64_t mDroppedCompositorFrames = 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;
// 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 aPresented,
uint64_t aDroppedDecodedFrames,
uint64_t aDroppedSinkFrames,
uint64_t aDroppedCompositorFrames)
: mParsedFrames(aParsed),
mPresentedFrames(aPresented) {}
void Accumulate(const FrameStatisticsData& aStats) {
mParsedFrames += aStats.mParsedFrames;
mDecodedFrames += aStats.mDecodedFrames;
mPresentedFrames += aStats.mPresentedFrames;
mDroppedDecodedFrames += aStats.mDroppedDecodedFrames;
mDroppedSinkFrames += aStats.mDroppedSinkFrames;
mDroppedCompositorFrames += aStats.mDroppedCompositorFrames;
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 {
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 presented and dropped frames
// Can be called on any thread.
uint64_t GetTotalFrames() const {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
return GetTotalFrames(mFrameStatisticsData);
static uint64_t GetTotalFrames(const FrameStatisticsData& aData) {
return aData.mPresentedFrames + GetDroppedFrames(aData);
// Returns the number of frames that have been skipped because they have
// missed their composition deadline.
uint64_t GetDroppedFrames() const {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
return GetDroppedFrames(mFrameStatisticsData);
static uint64_t GetDroppedFrames(const FrameStatisticsData& aData) {
return aData.mDroppedDecodedFrames + aData.mDroppedSinkFrames +
// Increments the parsed and decoded frame counters by the passed in counts.
// Can be called on any thread.
void Accumulate(const FrameStatisticsData& aStats) {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
// Increments the presented frame counters.
// Can be called on any thread.
void NotifyPresentedFrame() {
ReentrantMonitorAutoEnter mon(mReentrantMonitor);
// Stack based class to assist in notifying the frame statistics of
// parsed and decoded frames. Use inside video demux & decode functions
// to ensure all parsed and decoded frames are reported on all return paths.
class AutoNotifyDecoded {
explicit AutoNotifyDecoded(FrameStatistics* aFrameStats)
: mFrameStats(aFrameStats) {}
~AutoNotifyDecoded() {
if (mFrameStats) {
FrameStatisticsData mStats;
FrameStatistics* mFrameStats;
~FrameStatistics() = default;
// ReentrantMonitor to protect access of playback statistics.
mutable ReentrantMonitor mReentrantMonitor;
FrameStatisticsData mFrameStatisticsData;
} // namespace mozilla
#endif // FrameStatistics_h_