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48 lines
1 KiB
Go
48 lines
1 KiB
Go
package rtptime
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import (
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"time"
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)
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var epoch = time.Now()
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func FromDuration(d time.Duration, hz uint32) uint64 {
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return uint64(d) * uint64(hz) / uint64(time.Second)
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}
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func toDuration(tm uint64, hz uint32) time.Duration {
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return time.Duration(tm * uint64(time.Second) / uint64(hz))
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}
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func Now(hz uint32) uint64 {
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return FromDuration(time.Since(epoch), hz)
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}
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func Microseconds() uint64 {
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return Now(1000000)
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}
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// JiffiesPerSec is the LCM of 48000, 96000 and 65536
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const JiffiesPerSec = 24576000
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func Jiffies() uint64 {
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return Now(JiffiesPerSec)
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}
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var ntpEpoch = time.Date(1900, 1, 1, 0, 0, 0, 0, time.UTC)
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func NTPToTime(ntp uint64) time.Time {
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sec := uint32(ntp >> 32)
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frac := uint32(ntp & 0xFFFFFFFF)
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return ntpEpoch.Add(
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time.Duration(sec) * time.Second +
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((time.Duration(frac) * time.Second) >> 32),
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)
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}
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func TimeToNTP(tm time.Time) uint64 {
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d := tm.Sub(ntpEpoch)
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sec := uint32(d / time.Second)
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frac := uint32(d % time.Second)
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return (uint64(sec) << 32) + (uint64(frac) << 32) / uint64(time.Second)
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}
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