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