add AV1 format (#252)

pkg/formats/av1_test.go

@@ -0,0 +1,18 @@
+package formats //nolint:dupl
+
+import (
+	"testing"
+
+	"github.com/pion/rtp"
+	"github.com/stretchr/testify/require"
+)
+
+func TestAV1Attributes(t *testing.T) {
+	format := &AV1{
+		PayloadTyp: 100,
+	}
+	require.Equal(t, "AV1", format.String())
+	require.Equal(t, 90000, format.ClockRate())
+	require.Equal(t, uint8(100), format.PayloadType())
+	require.Equal(t, true, format.PTSEqualsDTS(&rtp.Packet{}))
+}