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// Copyright 2020, Chef. All rights reserved.
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// https://github.com/q191201771/lal
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//
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// Use of this source code is governed by a MIT-style license
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// that can be found in the License file.
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//
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// Author: Chef (191201771@qq.com)
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package rtprtcp
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// (70 * 365 + 17) * 24 * 60 * 60
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const offset uint64 = 2208988800
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// 将ntp时间戳转换为Unix时间戳，Unix时间戳单位是纳秒
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func NTP2UnixNano(v uint64) uint64 {
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msw := v >> 32
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lsw := v & 0xFFFFFFFF
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return (msw-offset)*1e9 + (lsw*1e9)>>32
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}
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// 将ntp时间戳（高32位低32位分开的形式）转换为Unix时间戳
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func MSWLSW2UnixNano(msw, lsw uint64) uint64 {
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return NTP2UnixNano(MSWLSW2NTP(msw, lsw))
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}
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// msw是ntp的高32位，lsw是ntp的低32位
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func MSWLSW2NTP(msw, lsw uint64) uint64 {
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return (msw << 32) | lsw
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}
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//func UnixNano2NTP(v uint64) uint64 {
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// msw := v / 1e9 + offset
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// lsw := ((v % 1e9) << 32) / 1e9
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// return (msw << 32) | lsw
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//}
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