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rtt calculation handles time go backwards

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CompactNtpIntervalToMs renamed to CompactNtpRttToMs and handle special cases:
large values consider negative/invalid and result in value of 1.
0 result consider too small and increases to 1.

BUG=590996
R=asapersson@webrtc.org, stefan@webrtc.org

Review URL: https://codereview.webrtc.org/1763823003 .

Cr-Commit-Position: refs/heads/master@{#11928}
This commit is contained in:
Danil Chapovalov
2016-03-09 15:14:35 +01:00
parent 8886c81658
commit c1e55c7136
9 changed files with 167 additions and 36 deletions
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8
webrtc/modules/rtp_rtcp/source/time_util.h
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@ -39,11 +39,9 @@ inline uint32_t CompactNtp(NtpTime ntp) {
return (ntp.seconds() << 16) | (ntp.fractions() >> 16);
}
// Converts interval between compact ntp timestamps to milliseconds.
// This interval can be upto ~18.2 hours (2^16 seconds).
inline uint32_t CompactNtpIntervalToMs(uint32_t compact_ntp_interval) {
uint64_t value = static_cast<uint64_t>(compact_ntp_interval);
return (value * 1000 + (1 << 15)) >> 16;
}
// This interval can be up to ~9.1 hours (2^15 seconds).
// Values close to 2^16 seconds consider negative and result in minimum rtt = 1.
int64_t CompactNtpRttToMs(uint32_t compact_ntp_interval);
} // namespace webrtc
#endif // WEBRTC_MODULES_RTP_RTCP_SOURCE_TIME_UTIL_H_