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Side by Side Diff: webrtc/base/bucketratetracker_unittest.cc

Issue 1279433006: Add a rate tracker that tracks rate over a given interval split up into buckets that accumulate uni… (Closed) Base URL: https://chromium.googlesource.com/external/webrtc.git@master
Patch Set: win64 fix Created 5 years, 4 months ago
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1 /*
2 * Copyright 2015 The WebRTC Project Authors. All rights reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "webrtc/base/gunit.h"
12 #include "webrtc/base/bucketratetracker.h"
13
14 namespace rtc {
15
16 class BucketRateTrackerForTest : public BucketRateTracker {
17 public:
18 BucketRateTrackerForTest() : BucketRateTracker(100u, 10u), time_(0) {}
19 virtual uint32 Time() const { return time_; }
20 void AdvanceTime(uint32 delta) { time_ += delta; }
21
22 private:
23 uint32 time_;
24 };
25
26 TEST(BucketRateTrackerTest, Test30FPS) {
27 BucketRateTrackerForTest tracker;
28
29 for (int i = 0; i < 300; ++i) {
30 tracker.AddSamples(1);
31 tracker.AdvanceTime(33);
32 if (i % 3 == 0) {
33 tracker.AdvanceTime(1);
34 }
35 }
36 EXPECT_EQ(30u, tracker.ComputeCurrentRate(50000u));
37 }
38
39 TEST(BucketRateTrackerTest, Test60FPS) {
40 BucketRateTrackerForTest tracker;
41
42 for (int i = 0; i < 300; ++i) {
43 tracker.AddSamples(1);
44 tracker.AdvanceTime(16);
45 if (i % 3 != 0) {
46 tracker.AdvanceTime(1);
47 }
48 }
49 EXPECT_EQ(60u, tracker.ComputeCurrentRate(1000u));
50 }
51
52 TEST(BucketRateTrackerTest, TestRateTrackerBasics) {
53 BucketRateTrackerForTest tracker;
54 EXPECT_EQ(0U, tracker.ComputeCurrentRate(1000u));
55
56 // Add a sample.
57 tracker.AddSamples(1234);
58 // Advance the clock by 100 ms.
59 tracker.AdvanceTime(100);
60 EXPECT_EQ(12340U, tracker.ComputeCurrentRate(1000u));
61
62 // Repeat.
63 tracker.AddSamples(1234);
64 tracker.AdvanceTime(100);
65 EXPECT_EQ(12340U, tracker.ComputeCurrentRate(1000u));
66
67 // Advance the clock by 800 ms, so we've elapsed a full second.
68 // units_second should now be filled in properly.
69 tracker.AdvanceTime(800);
70 EXPECT_EQ(1234U * 2, tracker.ComputeCurrentRate(1000u));
71
72 // Poll the tracker again immediately. The reported rate should stay the same.
73 EXPECT_EQ(1234U * 2, tracker.ComputeCurrentRate(1000u));
74
75 // Do nothing and advance by a second. We should drop down to zero.
76 tracker.AdvanceTime(1000);
77 EXPECT_EQ(0U, tracker.ComputeCurrentRate(1000u));
78
79 // Send a bunch of data at a constant rate for 5.5 "seconds".
80 // We should report the rate properly.
81 for (int i = 0; i < 5500; i += 100) {
82 tracker.AddSamples(9876U);
83 tracker.AdvanceTime(100);
84 }
85 EXPECT_EQ(9876U * 10, tracker.ComputeCurrentRate(1000u));
86
87 // Advance the clock by 500 ms. Since we sent nothing over this half-second,
88 // the reported rate should be reduced by half.
89 tracker.AdvanceTime(500);
90 EXPECT_EQ(9876U * 5, tracker.ComputeCurrentRate(1000u));
91 }
92
93 TEST(BucketRateTrackerTest, TestGetUnitSecondsAfterInitialValue) {
94 BucketRateTrackerForTest tracker;
95 tracker.AddSamples(1234);
96 tracker.AdvanceTime(1000);
97 EXPECT_EQ(1234u, tracker.ComputeCurrentRate(1000u));
98 }
99
100 class IntervalRateTrackerForTest : public IntervalRateTracker {
101 public:
102 IntervalRateTrackerForTest() : IntervalRateTracker(15u), time_(0) {}
103 virtual uint32 Time() const { return time_; }
104 void AdvanceTime(uint32 delta) { time_ += delta; }
105
106 private:
107 uint32 time_;
108 };
109
110 TEST(IntervalRateTrackerTest, Test30FPS) {
111 IntervalRateTrackerForTest tracker;
112
113 for (int i = 0; i < 30*30; ++i) {
114 tracker.AddSamples(1);
115 tracker.AdvanceTime(33);
116 if (i % 3 == 0) {
117 tracker.AdvanceTime(1);
118 }
119 }
120 EXPECT_EQ(30u, tracker.ComputeCurrentRate(1000u));
121 }
122
123 } // namespace rtc
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