65 lines
1.4 KiB
Go
65 lines
1.4 KiB
Go
package fmp4io
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import (
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"math"
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"time"
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"git.r-2.top/kunmeng/vdk/utils/bits/pio"
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)
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func GetTime32(b []byte) (t time.Time) {
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sec := pio.U32BE(b)
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if sec != 0 {
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t = time.Date(1904, time.January, 1, 0, 0, 0, 0, time.UTC)
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t = t.Add(time.Second * time.Duration(sec))
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}
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return
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}
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func PutTime32(b []byte, t time.Time) {
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var sec uint32
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if !t.IsZero() {
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dur := t.Sub(time.Date(1904, time.January, 1, 0, 0, 0, 0, time.UTC))
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sec = uint32(dur / time.Second)
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}
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pio.PutU32BE(b, sec)
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}
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func GetTime64(b []byte) (t time.Time) {
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sec := pio.U64BE(b)
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if sec != 0 {
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t = time.Date(1904, time.January, 1, 0, 0, 0, 0, time.UTC)
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t = t.Add(time.Second * time.Duration(sec))
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}
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return
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}
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func PutTime64(b []byte, t time.Time) {
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var sec uint64
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if !t.IsZero() {
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dur := t.Sub(time.Date(1904, time.January, 1, 0, 0, 0, 0, time.UTC))
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sec = uint64(dur / time.Second)
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}
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pio.PutU64BE(b, sec)
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}
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func PutFixed16(b []byte, f float64) {
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intpart, fracpart := math.Modf(f)
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b[0] = uint8(intpart)
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b[1] = uint8(fracpart * 256.0)
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}
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func GetFixed16(b []byte) float64 {
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return float64(b[0]) + float64(b[1])/256.0
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}
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func PutFixed32(b []byte, f float64) {
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intpart, fracpart := math.Modf(f)
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pio.PutU16BE(b[0:2], uint16(intpart))
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pio.PutU16BE(b[2:4], uint16(fracpart*65536.0))
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}
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func GetFixed32(b []byte) float64 {
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return float64(pio.U16BE(b[0:2])) + float64(pio.U16BE(b[2:4]))/65536.0
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}
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