test hls ll

format/fmp4/timescale/timescale.go

@@ -0,0 +1,27 @@
+package timescale
+
+import (
+	"math/bits"
+	"time"
+)
+
+// ToScale converts a decode time from time.Duration to a specified timescale
+func ToScale(t time.Duration, scale uint32) uint64 {
+	hi, lo := bits.Mul64(uint64(t), uint64(scale))
+	dts, rem := bits.Div64(hi, lo, uint64(time.Second))
+	if rem >= uint64(time.Second/2) {
+		// round up
+		dts++
+	}
+	return dts
+}
+
+// Relative converts a sub-second relative time (which may be negative) to a specified timescale
+func Relative(t time.Duration, scale uint32) int32 {
+	rel := int64(t) * int64(scale) / int64(time.Second/2)
+	if (rel&1 != 0) == (t > 0) {
+		// round up
+		rel++
+	}
+	return int32(rel >> 1)
+}