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1 /* | 1 /* |
2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
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941 // Following functions are used for randomizing TCP file size and | 941 // Following functions are used for randomizing TCP file size and |
942 // starting time, used on 5.7 RunMultipleShortTcpFairness. | 942 // starting time, used on 5.7 RunMultipleShortTcpFairness. |
943 // They are pseudo-random generators, creating always the same | 943 // They are pseudo-random generators, creating always the same |
944 // value sequence for a given Random seed. | 944 // value sequence for a given Random seed. |
945 | 945 |
946 std::vector<int> BweTest::GetFileSizesBytes(int num_files) { | 946 std::vector<int> BweTest::GetFileSizesBytes(int num_files) { |
947 // File size chosen from uniform distribution between [100,1000] kB. | 947 // File size chosen from uniform distribution between [100,1000] kB. |
948 const int kMinKbytes = 100; | 948 const int kMinKbytes = 100; |
949 const int kMaxKbytes = 1000; | 949 const int kMaxKbytes = 1000; |
950 | 950 |
951 test::Random random(0x12345678); | 951 Random random(0x12345678); |
952 std::vector<int> tcp_file_sizes_bytes; | 952 std::vector<int> tcp_file_sizes_bytes; |
953 | 953 |
954 while (num_files-- > 0) { | 954 while (num_files-- > 0) { |
955 tcp_file_sizes_bytes.push_back(random.Rand(kMinKbytes, kMaxKbytes) * 1000); | 955 tcp_file_sizes_bytes.push_back(random.Rand(kMinKbytes, kMaxKbytes) * 1000); |
956 } | 956 } |
957 | 957 |
958 return tcp_file_sizes_bytes; | 958 return tcp_file_sizes_bytes; |
959 } | 959 } |
960 | 960 |
961 std::vector<int64_t> BweTest::GetStartingTimesMs(int num_files) { | 961 std::vector<int64_t> BweTest::GetStartingTimesMs(int num_files) { |
962 // OFF state behaves as an exp. distribution with mean = 10 seconds. | 962 // OFF state behaves as an exp. distribution with mean = 10 seconds. |
963 const float kMeanMs = 10000.0f; | 963 const float kMeanMs = 10000.0f; |
964 test::Random random(0x12345678); | 964 Random random(0x12345678); |
965 | 965 |
966 std::vector<int64_t> tcp_starting_times_ms; | 966 std::vector<int64_t> tcp_starting_times_ms; |
967 | 967 |
968 // Two TCP Flows are initialized simultaneosly at t=0 seconds. | 968 // Two TCP Flows are initialized simultaneosly at t=0 seconds. |
969 for (int i = 0; i < 2; ++i, --num_files) { | 969 for (int i = 0; i < 2; ++i, --num_files) { |
970 tcp_starting_times_ms.push_back(0); | 970 tcp_starting_times_ms.push_back(0); |
971 } | 971 } |
972 | 972 |
973 // Other TCP Flows are initialized in an OFF state. | 973 // Other TCP Flows are initialized in an OFF state. |
974 while (num_files-- > 0) { | 974 while (num_files-- > 0) { |
975 tcp_starting_times_ms.push_back( | 975 tcp_starting_times_ms.push_back( |
976 static_cast<int64_t>(random.Exponential(1.0f / kMeanMs))); | 976 static_cast<int64_t>(random.Exponential(1.0f / kMeanMs))); |
977 } | 977 } |
978 | 978 |
979 return tcp_starting_times_ms; | 979 return tcp_starting_times_ms; |
980 } | 980 } |
981 | 981 |
982 } // namespace bwe | 982 } // namespace bwe |
983 } // namespace testing | 983 } // namespace testing |
984 } // namespace webrtc | 984 } // namespace webrtc |
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