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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "net/quic/quic_bandwidth.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "base/time/time.h" | |
| 9 | |
| 10 namespace net { | |
| 11 | |
| 12 // Highest number that QuicBandwidth can hold. | |
| 13 const int64 kQuicInfiniteBandwidth = GG_INT64_C(0x7fffffffffffffff); | |
| 14 | |
| 15 // static | |
| 16 QuicBandwidth QuicBandwidth::Zero() { | |
| 17 return QuicBandwidth(0); | |
| 18 } | |
| 19 | |
| 20 // static | |
| 21 QuicBandwidth QuicBandwidth::FromBitsPerSecond(int64 bits_per_second) { | |
| 22 return QuicBandwidth(bits_per_second); | |
| 23 } | |
| 24 | |
| 25 // static | |
| 26 QuicBandwidth QuicBandwidth::FromKBitsPerSecond(int64 k_bits_per_second) { | |
| 27 DCHECK(k_bits_per_second < kQuicInfiniteBandwidth / 1000); | |
| 28 return QuicBandwidth(k_bits_per_second * 1000); | |
| 29 } | |
| 30 | |
| 31 // static | |
| 32 QuicBandwidth QuicBandwidth::FromBytesPerSecond(int64 bytes_per_second) { | |
| 33 DCHECK(bytes_per_second < kQuicInfiniteBandwidth / 8); | |
| 34 return QuicBandwidth(bytes_per_second * 8); | |
| 35 } | |
| 36 | |
| 37 // static | |
| 38 QuicBandwidth QuicBandwidth::FromKBytesPerSecond(int64 k_bytes_per_second) { | |
| 39 DCHECK(k_bytes_per_second < kQuicInfiniteBandwidth / 8000); | |
| 40 return QuicBandwidth(k_bytes_per_second * 8000); | |
| 41 } | |
| 42 | |
| 43 // static | |
| 44 QuicBandwidth QuicBandwidth::FromBytesAndTimeDelta(QuicByteCount bytes, | |
| 45 QuicTime::Delta delta) { | |
| 46 DCHECK_LT(bytes, | |
| 47 static_cast<uint64>(kQuicInfiniteBandwidth / | |
| 48 (8 * base::Time::kMicrosecondsPerSecond))); | |
| 49 int64 bytes_per_second = (bytes * base::Time::kMicrosecondsPerSecond) / | |
| 50 delta.ToMicroseconds(); | |
| 51 return QuicBandwidth(bytes_per_second * 8); | |
| 52 } | |
| 53 | |
| 54 QuicBandwidth::QuicBandwidth(int64 bits_per_second) | |
| 55 : bits_per_second_(bits_per_second) { | |
| 56 DCHECK_GE(bits_per_second, 0); | |
| 57 } | |
| 58 | |
| 59 int64 QuicBandwidth::ToBitsPerSecond() const { | |
| 60 return bits_per_second_; | |
| 61 } | |
| 62 | |
| 63 int64 QuicBandwidth::ToKBitsPerSecond() const { | |
| 64 return bits_per_second_ / 1000; | |
| 65 } | |
| 66 | |
| 67 int64 QuicBandwidth::ToBytesPerSecond() const { | |
| 68 return bits_per_second_ / 8; | |
| 69 } | |
| 70 | |
| 71 int64 QuicBandwidth::ToKBytesPerSecond() const { | |
| 72 return bits_per_second_ / 8000; | |
| 73 } | |
| 74 | |
| 75 QuicByteCount QuicBandwidth::ToBytesPerPeriod( | |
| 76 QuicTime::Delta time_period) const { | |
| 77 return ToBytesPerSecond() * time_period.ToMicroseconds() / | |
| 78 base::Time::kMicrosecondsPerSecond; | |
| 79 } | |
| 80 | |
| 81 int64 QuicBandwidth::ToKBytesPerPeriod(QuicTime::Delta time_period) const { | |
| 82 return ToKBytesPerSecond() * time_period.ToMicroseconds() / | |
| 83 base::Time::kMicrosecondsPerSecond; | |
| 84 } | |
| 85 | |
| 86 bool QuicBandwidth::IsZero() const { | |
| 87 return (bits_per_second_ == 0); | |
| 88 } | |
| 89 | |
| 90 QuicBandwidth QuicBandwidth::Add(const QuicBandwidth& delta) const { | |
| 91 return QuicBandwidth(bits_per_second_ + delta.bits_per_second_); | |
| 92 } | |
| 93 | |
| 94 QuicBandwidth QuicBandwidth::Subtract(const QuicBandwidth& delta) const { | |
| 95 return QuicBandwidth(bits_per_second_ - delta.bits_per_second_); | |
| 96 } | |
| 97 | |
| 98 QuicBandwidth QuicBandwidth::Scale(float scale_factor) const { | |
| 99 return QuicBandwidth(static_cast<int64>(bits_per_second_ * scale_factor)); | |
| 100 } | |
| 101 | |
| 102 QuicTime::Delta QuicBandwidth::TransferTime(QuicByteCount bytes) const { | |
| 103 if (bits_per_second_ == 0) { | |
| 104 return QuicTime::Delta::Zero(); | |
| 105 } | |
| 106 return QuicTime::Delta::FromMicroseconds( | |
| 107 bytes * 8 * base::Time::kMicrosecondsPerSecond / bits_per_second_); | |
| 108 } | |
| 109 | |
| 110 } // namespace net | |
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