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92ea95e34a
In https://webrtc-review.googlesource.com/c/src/+/1560 we moved WebRTC from src/webrtc to src/ (in order to preserve an healthy git history). This CL takes care of fixing header guards, #include paths, etc... NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true TBR=tommi@webrtc.org Bug: chromium:611808 Change-Id: Iea91618212bee0af16aa3f05071eab8f93706578 Reviewed-on: https://webrtc-review.googlesource.com/1561 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Henrik Kjellander <kjellander@webrtc.org> Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#19846}
42 lines
1.8 KiB
C++
42 lines
1.8 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/rtp_rtcp/source/time_util.h"
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#include <algorithm>
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namespace webrtc {
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namespace {
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// TODO(danilchap): Make generic, optimize and move to base.
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inline int64_t DivideRoundToNearest(int64_t x, uint32_t y) {
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// Caller ensure x is positive by converting unsigned value into it.
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// So this Divide doesn't need to handle negative argument case.
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return (x + y / 2) / y;
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}
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} // namespace
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int64_t CompactNtpRttToMs(uint32_t compact_ntp_interval) {
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// Interval to convert expected to be positive, e.g. rtt or delay.
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// Because interval can be derived from non-monotonic ntp clock,
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// it might become negative that is indistinguishable from very large values.
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// Since very large rtt/delay are less likely than non-monotonic ntp clock,
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// those values consider to be negative and convert to minimum value of 1ms.
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if (compact_ntp_interval > 0x80000000)
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return 1;
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// Convert to 64bit value to avoid multiplication overflow.
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int64_t value = static_cast<int64_t>(compact_ntp_interval);
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// To convert to milliseconds need to divide by 2^16 to get seconds,
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// then multiply by 1000 to get milliseconds. To avoid float operations,
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// multiplication and division swapped.
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int64_t ms = DivideRoundToNearest(value * 1000, 1 << 16);
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// Rtt value 0 considered too good to be true and increases to 1.
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return std::max<int64_t>(ms, 1);
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}
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} // namespace webrtc
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