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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "media/base/android/media_statistics.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "base/metrics/histogram_macros.h" | |
9 #include "media/base/android/demuxer_stream_player_params.h" | |
10 | |
11 namespace media { | |
12 | |
13 // Minimum playback interval to report. | |
14 const int kMinDurationInSeconds = 2; | |
15 | |
16 // Maximum playback interval to report. | |
17 const int kMaxDurationInSeconds = 3600; | |
18 | |
19 // Number of slots in the histogram for playback interval. | |
20 const int kNumDurationSlots = 50; | |
21 | |
22 // For easier reading. | |
23 const int kOneMillion = 1000000; | |
24 | |
25 void FrameStatistics::IncrementLateFrameCount() { | |
26 // Do not collect the late frame if this is the first frame after the start. | |
27 // Right now we do not want to consider the late video frame which is the | |
28 // first after preroll, preroll may be inacurate in this respect. | |
29 // The first audio frame cannot be late by definition and by not considering | |
30 // it we can simplify audio decoder code. | |
31 if (total == 1) | |
Tima Vaisburd
2015/10/02 00:44:32
I accidently deleted this check in the prior PS, r
| |
32 return; | |
33 | |
34 ++late; | |
35 } | |
36 | |
37 MediaStatistics::MediaStatistics() {} | |
38 | |
39 MediaStatistics::~MediaStatistics() {} | |
40 | |
41 void MediaStatistics::Start(base::TimeDelta current_playback_time) { | |
42 DVLOG(1) << __FUNCTION__; | |
43 | |
44 if (start_time_ == kNoTimestamp()) { | |
Tima Vaisburd
2015/10/02 00:44:32
I changed the Start() semantic to follow StopAndRe
| |
45 Clear(); | |
46 start_time_ = current_playback_time; | |
47 } | |
48 } | |
49 | |
50 void MediaStatistics::StopAndReport(base::TimeDelta current_playback_time) { | |
51 DVLOG(1) << __FUNCTION__; | |
52 | |
53 if (start_time_ == kNoTimestamp()) | |
54 return; // skip if there was no prior Start(). | |
55 | |
56 base::TimeDelta duration = current_playback_time - start_time_; | |
57 | |
58 // Reset start time. | |
59 start_time_ = kNoTimestamp(); | |
60 | |
61 if (duration < base::TimeDelta::FromSeconds(kMinDurationInSeconds)) | |
62 return; // duration is too short. | |
63 | |
64 if (duration > base::TimeDelta::FromSeconds(kMaxDurationInSeconds)) | |
65 return; // duration is too long. | |
66 | |
67 Report(duration); | |
68 } | |
69 | |
70 void MediaStatistics::Clear() { | |
71 start_time_ = kNoTimestamp(); | |
72 audio_frame_stats_.Clear(); | |
73 video_frame_stats_.Clear(); | |
74 num_starvations_ = 0; | |
75 } | |
76 | |
77 void MediaStatistics::Report(base::TimeDelta duration) { | |
78 DVLOG(1) << __FUNCTION__ << " duration:" << duration | |
79 << " audio frames:" | |
80 << audio_frame_stats_.late << "/" << audio_frame_stats_.total | |
81 << " video frames:" | |
82 << video_frame_stats_.late << "/" << video_frame_stats_.total | |
83 << " starvations:" << num_starvations_; | |
84 | |
85 // Playback duration is the time interval between the moment playback starts | |
86 // and the moment it is interrupted either by stopping or by seeking, changing | |
87 // to full screen, minimizing the browser etc. The interval is measured by | |
88 // media time. | |
89 | |
90 UMA_HISTOGRAM_CUSTOM_TIMES( | |
91 "Media.MSE.PlaybackDuration", duration, | |
92 base::TimeDelta::FromSeconds(kMinDurationInSeconds), | |
93 base::TimeDelta::FromSeconds(kMaxDurationInSeconds), kNumDurationSlots); | |
94 | |
95 // Number of late frames per one million frames. | |
96 // We expect the ratios of the late frames to the total number of frames to be | |
97 // less than 1%, therefore after multiplying by one millon the range should be | |
98 // [0, 10000]. | |
99 | |
100 if (audio_frame_stats_.total) { | |
101 UMA_HISTOGRAM_COUNTS( | |
102 "Media.MSE.LateAudioFrames", | |
103 kOneMillion * audio_frame_stats_.late / audio_frame_stats_.total); | |
104 } | |
105 | |
106 if (video_frame_stats_.total) { | |
107 UMA_HISTOGRAM_COUNTS( | |
108 "Media.MSE.LateVideoFrames", | |
109 kOneMillion * video_frame_stats_.late / video_frame_stats_.total); | |
110 } | |
111 | |
112 // Number of starvations per one million frames. | |
113 | |
114 uint32_t total_frames = audio_frame_stats_.total ? audio_frame_stats_.total | |
115 : video_frame_stats_.total; | |
116 if (total_frames) { | |
117 UMA_HISTOGRAM_COUNTS("Media.MSE.Starvations", | |
118 kOneMillion * num_starvations_ / total_frames); | |
119 } | |
120 } | |
121 | |
122 } // namespace media | |
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