Implement jiffies.

rtptime/rtptime.go

@@ -22,6 +22,13 @@ func Microseconds() uint64 {
 	return Now(1000000)
 }
 
+// JiffiesPerSec is the LCM of 48000, 96000 and 65536
+const JiffiesPerSec = 24576000
+
+func Jiffies() uint64 {
+	return Now(JiffiesPerSec)
+}
+
 var ntpEpoch = time.Date(1900, 1, 1, 0, 0, 0, 0, time.UTC)
 
 func NTPToTime(ntp uint64) time.Time {

rtptime/rtptime_test.go

@@ -24,7 +24,7 @@ func differs(a, b, delta uint64) bool {
 	return a - b >= delta
 }
 
-func TestMono(t *testing.T) {
+func TestTime(t *testing.T) {
 	a := Now(48000)
 	time.Sleep(4 * time.Millisecond)
 	b := Now(48000) - a
@@ -38,6 +38,13 @@ func TestMono(t *testing.T) {
 	if differs(d, 4000, 1000) {
 		t.Errorf("Expected %v, got %v", 4000, d)
 	}
+
+	c = Jiffies()
+	time.Sleep(time.Second * 100000 / JiffiesPerSec)
+	d = Jiffies() - c
+	if differs(d, 100000, 10000) {
+		t.Errorf("Expected %v, got %v", 4000, d)
+	}
 }
 
 func TestNTP(t *testing.T) {