1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
// Copyright 2014 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 "chromecast/base/metrics/cast_metrics_helper.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/location.h"
#include "base/message_loop/message_loop_proxy.h"
#include "base/metrics/histogram.h"
#include "base/metrics/user_metrics.h"
#include "chromecast/base/metrics/cast_histograms.h"
#include "chromecast/base/metrics/grouped_histogram.h"
namespace chromecast {
namespace metrics {
// A useful macro to make sure current member function runs on the valid thread.
#define MAKE_SURE_THREAD(callback, ...) \
if (!message_loop_proxy_->BelongsToCurrentThread()) { \
message_loop_proxy_->PostTask(FROM_HERE, base::Bind( \
&CastMetricsHelper::callback, \
base::Unretained(this), ##__VA_ARGS__)); \
return; \
}
namespace {
CastMetricsHelper* g_instance = NULL;
// Displayed frames are logged in frames per second (but sampling can be over
// a longer period of time, e.g. 5 seconds).
const int kDisplayedFramesPerSecondPeriod = 1000000;
// Sample every 5 seconds, represented in microseconds.
const int kNominalVideoSamplePeriod = 5000000;
} // namespace
CastMetricsHelper* CastMetricsHelper::GetInstance() {
DCHECK(g_instance);
return g_instance;
}
CastMetricsHelper::CastMetricsHelper(
scoped_refptr<base::MessageLoopProxy> message_loop_proxy)
: message_loop_proxy_(message_loop_proxy),
metrics_sink_(NULL) {
DCHECK(message_loop_proxy_.get());
DCHECK(!g_instance);
g_instance = this;
}
CastMetricsHelper::CastMetricsHelper()
: metrics_sink_(NULL) {
DCHECK(!g_instance);
g_instance = this;
}
CastMetricsHelper::~CastMetricsHelper() {
DCHECK_EQ(g_instance, this);
g_instance = NULL;
}
void CastMetricsHelper::TagAppStart(const std::string& arg_app_name) {
MAKE_SURE_THREAD(TagAppStart, arg_app_name);
app_name_ = arg_app_name;
app_start_time_ = base::TimeTicks::Now();
new_startup_time_ = true;
TagAppStartForGroupedHistograms(app_name_);
}
void CastMetricsHelper::LogMediaPlay() {
LogAction(GetMetricsNameWithAppName("MediaPlay", ""));
}
void CastMetricsHelper::LogMediaPause() {
LogAction(GetMetricsNameWithAppName("MediaPause", ""));
}
void CastMetricsHelper::LogTimeToDisplayVideo() {
if (!new_startup_time_) { // For faster check.
return;
}
MAKE_SURE_THREAD(LogTimeToDisplayVideo);
new_startup_time_ = false;
base::TimeDelta launch_time = base::TimeTicks::Now() - app_start_time_;
const std::string uma_name(GetMetricsNameWithAppName("Startup",
"TimeToDisplayVideo"));
LogMediumTimeHistogramEvent(uma_name, launch_time);
LOG(INFO) << uma_name << " is " << launch_time.InSecondsF() << " seconds.";
}
void CastMetricsHelper::LogTimeToBufferAv(BufferingType buffering_type,
base::TimeDelta time) {
MAKE_SURE_THREAD(LogTimeToBufferAv, buffering_type, time);
if (time < base::TimeDelta::FromSeconds(0)) {
LOG(WARNING) << "Negative time";
return;
}
const std::string uma_name(GetMetricsNameWithAppName(
"Media",
(buffering_type == kInitialBuffering ? "TimeToBufferAv" :
buffering_type == kBufferingAfterUnderrun ?
"TimeToBufferAvAfterUnderrun" :
buffering_type == kAbortedBuffering ? "TimeToBufferAvAfterAbort" : "")));
// Histogram from 250ms to 30s with 50 buckets.
// The ratio between 2 consecutive buckets is:
// exp( (ln(30000) - ln(250)) / 50 ) = 1.1
LogTimeHistogramEvent(
uma_name,
time,
base::TimeDelta::FromMilliseconds(250),
base::TimeDelta::FromMilliseconds(30000),
50);
}
void CastMetricsHelper::ResetVideoFrameSampling() {
MAKE_SURE_THREAD(ResetVideoFrameSampling);
previous_video_stat_sample_time_ = base::TimeTicks();
}
void CastMetricsHelper::LogFramesPer5Seconds(int displayed_frames,
int dropped_frames,
int delayed_frames,
int error_frames) {
MAKE_SURE_THREAD(LogFramesPer5Seconds, displayed_frames, dropped_frames,
delayed_frames, error_frames);
base::TimeTicks sample_time = base::TimeTicks::Now();
if (!previous_video_stat_sample_time_.is_null()) {
base::TimeDelta time_diff = sample_time - previous_video_stat_sample_time_;
int value = 0;
const int64 rounding = time_diff.InMicroseconds() / 2;
if (displayed_frames >= 0) {
value = (displayed_frames * kDisplayedFramesPerSecondPeriod + rounding) /
time_diff.InMicroseconds();
LogEnumerationHistogramEvent(
GetMetricsNameWithAppName("Media", "DisplayedFramesPerSecond"),
value, 50);
}
if (delayed_frames >= 0) {
value = (delayed_frames * kNominalVideoSamplePeriod + rounding) /
time_diff.InMicroseconds();
LogEnumerationHistogramEvent(
GetMetricsNameWithAppName("Media", "DelayedVideoFramesPer5Sec"),
value, 50);
}
if (dropped_frames >= 0) {
value = (dropped_frames * kNominalVideoSamplePeriod + rounding) /
time_diff.InMicroseconds();
LogEnumerationHistogramEvent(
GetMetricsNameWithAppName("Media", "DroppedVideoFramesPer5Sec"),
value, 50);
}
if (error_frames >= 0) {
value = (error_frames * kNominalVideoSamplePeriod + rounding) /
time_diff.InMicroseconds();
LogEnumerationHistogramEvent(
GetMetricsNameWithAppName("Media", "ErrorVideoFramesPer5Sec"),
value, 50);
}
}
previous_video_stat_sample_time_ = sample_time;
}
std::string CastMetricsHelper::GetMetricsNameWithAppName(
const std::string& prefix,
const std::string& suffix) const {
DCHECK(message_loop_proxy_->BelongsToCurrentThread());
std::string metrics_name(prefix);
if (!app_name_.empty()) {
if (!metrics_name.empty())
metrics_name.push_back('.');
metrics_name.append(app_name_);
}
if (!suffix.empty()) {
if (!metrics_name.empty())
metrics_name.push_back('.');
metrics_name.append(suffix);
}
return metrics_name;
}
void CastMetricsHelper::SetMetricsSink(MetricsSink* delegate) {
MAKE_SURE_THREAD(SetMetricsSink, delegate);
metrics_sink_ = delegate;
}
void CastMetricsHelper::LogAction(const std::string& action) {
MAKE_SURE_THREAD(LogAction, action);
if (metrics_sink_) {
metrics_sink_->OnAction(action);
} else {
base::RecordComputedAction(action);
}
}
void CastMetricsHelper::LogEnumerationHistogramEvent(
const std::string& name, int value, int num_buckets) {
MAKE_SURE_THREAD(LogEnumerationHistogramEvent, name, value, num_buckets);
if (metrics_sink_) {
metrics_sink_->OnEnumerationEvent(name, value, num_buckets);
} else {
UMA_HISTOGRAM_ENUMERATION_NO_CACHE(name, value, num_buckets);
}
}
void CastMetricsHelper::LogTimeHistogramEvent(const std::string& name,
const base::TimeDelta& value,
const base::TimeDelta& min,
const base::TimeDelta& max,
int num_buckets) {
MAKE_SURE_THREAD(LogTimeHistogramEvent, name, value, min, max, num_buckets);
if (metrics_sink_) {
metrics_sink_->OnTimeEvent(name, value, min, max, num_buckets);
} else {
UMA_HISTOGRAM_CUSTOM_TIMES_NO_CACHE(name, value, min, max, num_buckets);
}
}
void CastMetricsHelper::LogMediumTimeHistogramEvent(
const std::string& name,
const base::TimeDelta& value) {
// Follow UMA_HISTOGRAM_MEDIUM_TIMES definition.
LogTimeHistogramEvent(name, value,
base::TimeDelta::FromMilliseconds(10),
base::TimeDelta::FromMinutes(3),
50);
}
} // namespace metrics
} // namespace chromecast
|
