mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-14 06:10:40 +01:00
cab90db24a
This consolidates the querying of the Ntp time in once place, the clock. Bug: webrtc:11327 Change-Id: I14b19c2380996571d8c67c2c186629c209787162 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/219794 Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Paul Hallak <phallak@google.com> Cr-Commit-Position: refs/heads/master@{#34083}
42 lines
1.6 KiB
C++
42 lines
1.6 KiB
C++
/*
|
|
* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
#ifndef MODULES_RTP_RTCP_SOURCE_TIME_UTIL_H_
|
|
#define MODULES_RTP_RTCP_SOURCE_TIME_UTIL_H_
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "system_wrappers/include/ntp_time.h"
|
|
|
|
namespace webrtc {
|
|
|
|
// Helper function for compact ntp representation:
|
|
// RFC 3550, Section 4. Time Format.
|
|
// Wallclock time is represented using the timestamp format of
|
|
// the Network Time Protocol (NTP).
|
|
// ...
|
|
// In some fields where a more compact representation is
|
|
// appropriate, only the middle 32 bits are used; that is, the low 16
|
|
// bits of the integer part and the high 16 bits of the fractional part.
|
|
inline uint32_t CompactNtp(NtpTime ntp) {
|
|
return (ntp.seconds() << 16) | (ntp.fractions() >> 16);
|
|
}
|
|
|
|
// Converts interval in microseconds to compact ntp (1/2^16 seconds) resolution.
|
|
// Negative values converted to 0, Overlarge values converted to max uint32_t.
|
|
uint32_t SaturatedUsToCompactNtp(int64_t us);
|
|
|
|
// Converts interval between compact ntp timestamps to milliseconds.
|
|
// 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 // MODULES_RTP_RTCP_SOURCE_TIME_UTIL_H_
|