1 /* 2 * Copyright (c) 2012 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 "testing/gtest/include/gtest/gtest.h" 12 #include "webrtc/modules/remote_bitrate_estimator/rate_statistics.h" 13 14 namespace { 15 16 using webrtc::RateStatistics; 17 18 class RateStatisticsTest : public ::testing::Test { 19 protected: 20 RateStatisticsTest() : stats_(500, 8000) {} 21 RateStatistics stats_; 22 }; 23 24 TEST_F(RateStatisticsTest, TestStrictMode) { 25 int64_t now_ms = 0; 26 // Should be initialized to 0. 27 EXPECT_EQ(0u, stats_.Rate(now_ms)); 28 stats_.Update(1500, now_ms); 29 // Expecting 24 kbps given a 500 ms window with one 1500 bytes packet. 30 EXPECT_EQ(24000u, stats_.Rate(now_ms)); 31 stats_.Reset(); 32 // Expecting 0 after init. 33 EXPECT_EQ(0u, stats_.Rate(now_ms)); 34 for (int i = 0; i < 100000; ++i) { 35 if (now_ms % 10 == 0) { 36 stats_.Update(1500, now_ms); 37 } 38 // Approximately 1200 kbps expected. Not exact since when packets 39 // are removed we will jump 10 ms to the next packet. 40 if (now_ms > 0 && now_ms % 500 == 0) { 41 EXPECT_NEAR(1200000u, stats_.Rate(now_ms), 24000u); 42 } 43 now_ms += 1; 44 } 45 now_ms += 500; 46 // The window is 2 seconds. If nothing has been received for that time 47 // the estimate should be 0. 48 EXPECT_EQ(0u, stats_.Rate(now_ms)); 49 } 50 51 TEST_F(RateStatisticsTest, IncreasingThenDecreasingBitrate) { 52 int64_t now_ms = 0; 53 stats_.Reset(); 54 // Expecting 0 after init. 55 uint32_t bitrate = stats_.Rate(now_ms); 56 EXPECT_EQ(0u, bitrate); 57 // 1000 bytes per millisecond until plateau is reached. 58 while (++now_ms < 10000) { 59 stats_.Update(1000, now_ms); 60 uint32_t new_bitrate = stats_.Rate(now_ms); 61 if (new_bitrate != bitrate) { 62 // New bitrate must be higher than previous one. 63 EXPECT_GT(new_bitrate, bitrate); 64 } else { 65 // Plateau reached, 8000 kbps expected. 66 EXPECT_NEAR(8000000u, bitrate, 80000u); 67 break; 68 } 69 bitrate = new_bitrate; 70 } 71 // 1000 bytes per millisecond until 10-second mark, 8000 kbps expected. 72 while (++now_ms < 10000) { 73 stats_.Update(1000, now_ms); 74 bitrate = stats_.Rate(now_ms); 75 EXPECT_NEAR(8000000u, bitrate, 80000u); 76 } 77 // Zero bytes per millisecond until 0 is reached. 78 while (++now_ms < 20000) { 79 stats_.Update(0, now_ms); 80 uint32_t new_bitrate = stats_.Rate(now_ms); 81 if (new_bitrate != bitrate) { 82 // New bitrate must be lower than previous one. 83 EXPECT_LT(new_bitrate, bitrate); 84 } else { 85 // 0 kbps expected. 86 EXPECT_EQ(0u, bitrate); 87 break; 88 } 89 bitrate = new_bitrate; 90 } 91 // Zero bytes per millisecond until 20-second mark, 0 kbps expected. 92 while (++now_ms < 20000) { 93 stats_.Update(0, now_ms); 94 EXPECT_EQ(0u, stats_.Rate(now_ms)); 95 } 96 } 97 } // namespace 98
