Index: media/base/android/media_statistics.cc |
diff --git a/media/base/android/media_statistics.cc b/media/base/android/media_statistics.cc |
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+++ b/media/base/android/media_statistics.cc |
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+// Copyright 2015 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "media/base/android/media_statistics.h" |
+ |
+#include "base/logging.h" |
+#include "base/metrics/histogram_macros.h" |
+#include "media/base/android/demuxer_stream_player_params.h" |
+ |
+namespace media { |
+ |
+// Minimum playback interval to report. |
+const int kMinDurationInSeconds = 2; |
+ |
+// Maximum playback interval to report. |
+const int kMaxDurationInSeconds = 3600; |
+ |
+// Number of slots in the histogram for playback interval. |
+const int kNumDurationSlots = 50; |
+ |
+// For easier reading. |
+const int kOneMillion = 1000000; |
+ |
+void FrameStatistics::IncrementLateFrameCount() { |
+ // Do not collect the late frame if this is the first frame after the start. |
+ // Right now we do not want to consider the late video frame which is the |
+ // first after preroll, preroll may be inacurate in this respect. |
+ // The first audio frame cannot be late by definition and by not considering |
+ // it we can simplify audio decoder code. |
+ if (total == 1) |
+ return; |
+ |
+ ++late; |
+} |
+ |
+MediaStatistics::MediaStatistics() {} |
+ |
+MediaStatistics::~MediaStatistics() {} |
+ |
+void MediaStatistics::Start(base::TimeDelta current_playback_time) { |
+ DVLOG(1) << __FUNCTION__; |
+ |
+ if (start_time_ == kNoTimestamp()) { |
+ Clear(); |
+ start_time_ = current_playback_time; |
+ } |
+} |
+ |
+void MediaStatistics::StopAndReport(base::TimeDelta current_playback_time) { |
+ DVLOG(1) << __FUNCTION__; |
+ |
+ if (start_time_ == kNoTimestamp()) |
+ return; // skip if there was no prior Start(). |
+ |
+ base::TimeDelta duration = current_playback_time - start_time_; |
+ |
+ // Reset start time. |
+ start_time_ = kNoTimestamp(); |
+ |
+ if (duration < base::TimeDelta::FromSeconds(kMinDurationInSeconds)) |
+ return; // duration is too short. |
+ |
+ if (duration > base::TimeDelta::FromSeconds(kMaxDurationInSeconds)) |
+ return; // duration is too long. |
+ |
+ Report(duration); |
+} |
+ |
+void MediaStatistics::Clear() { |
+ start_time_ = kNoTimestamp(); |
+ audio_frame_stats_.Clear(); |
+ video_frame_stats_.Clear(); |
+ num_starvations_ = 0; |
+} |
+ |
+void MediaStatistics::Report(base::TimeDelta duration) { |
+ DVLOG(1) << __FUNCTION__ << " duration:" << duration |
+ << " audio frames:" |
+ << audio_frame_stats_.late << "/" << audio_frame_stats_.total |
+ << " video frames:" |
+ << video_frame_stats_.late << "/" << video_frame_stats_.total |
+ << " starvations:" << num_starvations_; |
+ |
+ // Playback duration is the time interval between the moment playback starts |
+ // and the moment it is interrupted either by stopping or by seeking, changing |
+ // to full screen, minimizing the browser etc. The interval is measured by |
+ // media time. |
+ |
+ UMA_HISTOGRAM_CUSTOM_TIMES( |
+ "Media.MSE.PlaybackDuration", duration, |
+ base::TimeDelta::FromSeconds(kMinDurationInSeconds), |
+ base::TimeDelta::FromSeconds(kMaxDurationInSeconds), kNumDurationSlots); |
+ |
+ // Number of late frames per one million frames. |
+ |
+ if (audio_frame_stats_.total) { |
+ UMA_HISTOGRAM_COUNTS( |
+ "Media.MSE.LateAudioFrames", |
+ kOneMillion * audio_frame_stats_.late / audio_frame_stats_.total); |
+ } |
+ |
+ if (video_frame_stats_.total) { |
+ UMA_HISTOGRAM_COUNTS( |
+ "Media.MSE.LateVideoFrames", |
+ kOneMillion * video_frame_stats_.late / video_frame_stats_.total); |
+ } |
+ |
+ // Number of starvations per one million frames. |
+ |
+ uint32_t total_frames = audio_frame_stats_.total ? audio_frame_stats_.total |
+ : video_frame_stats_.total; |
+ if (total_frames) { |
+ UMA_HISTOGRAM_COUNTS("Media.MSE.Starvations", |
+ kOneMillion * num_starvations_ / total_frames); |
+ } |
+} |
+ |
+} // namespace media |