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
|
/*
* Copyright 2021 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "common_video/framerate_controller.h"
#include <cstdint>
#include "rtc_base/time_utils.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
constexpr int kInputFps = 30;
constexpr int kNumFrames = 60;
} // namespace
class FramerateControllerTest : public ::testing::Test {
protected:
int64_t GetNextTimestampNs() {
int64_t interval_us = kNumMicrosecsPerSec / kInputFps;
next_timestamp_us_ += interval_us;
return next_timestamp_us_ * kNumNanosecsPerMicrosec;
}
int64_t next_timestamp_us_ = TimeMicros();
FramerateController controller_;
};
TEST_F(FramerateControllerTest, NoFramesDroppedIfNothingRequested) {
// Default max framerate is maxdouble.
for (int i = 1; i < kNumFrames; ++i)
EXPECT_FALSE(controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, AllFramesDroppedIfZeroRequested) {
controller_.SetMaxFramerate(0);
for (int i = 1; i < kNumFrames; ++i)
EXPECT_TRUE(controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, AllFramesDroppedIfNegativeRequested) {
controller_.SetMaxFramerate(-1);
for (int i = 1; i < kNumFrames; ++i)
EXPECT_TRUE(controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, EverySecondFrameDroppedIfHalfRequested) {
controller_.SetMaxFramerate(kInputFps / 2);
// The first frame should not be dropped.
for (int i = 1; i < kNumFrames; ++i)
EXPECT_EQ(i % 2 == 0, controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, EveryThirdFrameDroppedIfTwoThirdsRequested) {
controller_.SetMaxFramerate(kInputFps * 2 / 3);
// The first frame should not be dropped.
for (int i = 1; i < kNumFrames; ++i)
EXPECT_EQ(i % 3 == 0, controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, NoFrameDroppedIfTwiceRequested) {
controller_.SetMaxFramerate(kInputFps * 2);
for (int i = 1; i < kNumFrames; ++i)
EXPECT_FALSE(controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, TestAverageFramerate) {
const double kMaxFps = 18.2;
controller_.SetMaxFramerate(kMaxFps);
const int kNumSec = 10;
int frames_kept = 0;
for (int i = 0; i < kInputFps * kNumSec; ++i) {
if (!controller_.ShouldDropFrame(GetNextTimestampNs()))
++frames_kept;
}
double average_fps = static_cast<double>(frames_kept) / kNumSec;
EXPECT_NEAR(kMaxFps, average_fps, 0.01);
}
TEST_F(FramerateControllerTest, NoFrameDroppedForLargeTimestampOffset) {
controller_.SetMaxFramerate(kInputFps);
EXPECT_FALSE(controller_.ShouldDropFrame(0));
const int64_t kLargeOffsetNs = -987654321LL * 1000;
EXPECT_FALSE(controller_.ShouldDropFrame(kLargeOffsetNs));
int64_t input_interval_ns = kNumNanosecsPerSec / kInputFps;
EXPECT_FALSE(controller_.ShouldDropFrame(kLargeOffsetNs + input_interval_ns));
}
TEST_F(FramerateControllerTest, NoFrameDroppedIfInputWithJitterRequested) {
controller_.SetMaxFramerate(kInputFps);
// Input fps with jitter.
int64_t input_interval_ns = kNumNanosecsPerSec / kInputFps;
EXPECT_FALSE(controller_.ShouldDropFrame(input_interval_ns * 0 / 10));
EXPECT_FALSE(controller_.ShouldDropFrame(input_interval_ns * 10 / 10 - 1));
EXPECT_FALSE(controller_.ShouldDropFrame(input_interval_ns * 25 / 10));
EXPECT_FALSE(controller_.ShouldDropFrame(input_interval_ns * 30 / 10));
EXPECT_FALSE(controller_.ShouldDropFrame(input_interval_ns * 35 / 10));
EXPECT_FALSE(controller_.ShouldDropFrame(input_interval_ns * 50 / 10));
}
TEST_F(FramerateControllerTest, FrameDroppedWhenReductionRequested) {
controller_.SetMaxFramerate(kInputFps);
// Expect no frame drop.
for (int i = 1; i < kNumFrames; ++i)
EXPECT_FALSE(controller_.ShouldDropFrame(GetNextTimestampNs()));
// Reduce max frame rate.
controller_.SetMaxFramerate(kInputFps / 2);
// Verify that every other frame is dropped.
for (int i = 1; i < kNumFrames; ++i)
EXPECT_EQ(i % 2 == 0, controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, NoFramesDroppedAfterReset) {
controller_.SetMaxFramerate(0);
// All frames dropped.
for (int i = 1; i < kNumFrames; ++i)
EXPECT_TRUE(controller_.ShouldDropFrame(GetNextTimestampNs()));
controller_.Reset();
// Expect no frame drop after reset.
for (int i = 1; i < kNumFrames; ++i)
EXPECT_FALSE(controller_.ShouldDropFrame(GetNextTimestampNs()));
}
TEST_F(FramerateControllerTest, TestKeepFrame) {
FramerateController controller(kInputFps / 2);
EXPECT_FALSE(controller.ShouldDropFrame(GetNextTimestampNs()));
EXPECT_TRUE(controller.ShouldDropFrame(GetNextTimestampNs()));
EXPECT_FALSE(controller.ShouldDropFrame(GetNextTimestampNs()));
EXPECT_TRUE(controller.ShouldDropFrame(GetNextTimestampNs()));
EXPECT_FALSE(controller.ShouldDropFrame(GetNextTimestampNs()));
// Next frame should be dropped.
// Keep this frame (e.g. in case of a key frame).
controller.KeepFrame(GetNextTimestampNs());
// Expect next frame to be dropped instead.
EXPECT_TRUE(controller.ShouldDropFrame(GetNextTimestampNs()));
}
} // namespace webrtc
|
