28 lines
645 B
Go
28 lines
645 B
Go
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package timescale
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import (
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"math/bits"
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"time"
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)
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// ToScale converts a decode time from time.Duration to a specified timescale
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func ToScale(t time.Duration, scale uint32) uint64 {
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hi, lo := bits.Mul64(uint64(t), uint64(scale))
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dts, rem := bits.Div64(hi, lo, uint64(time.Second))
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if rem >= uint64(time.Second/2) {
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// round up
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dts++
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}
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return dts
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}
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// Relative converts a sub-second relative time (which may be negative) to a specified timescale
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func Relative(t time.Duration, scale uint32) int32 {
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rel := int64(t) * int64(scale) / int64(time.Second/2)
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if (rel&1 != 0) == (t > 0) {
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// round up
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rel++
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}
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return int32(rel >> 1)
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}
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