add RTP/Opus decoder and encoder (#151)

pkg/rtpopus/encoder_test.go

@@ -0,0 +1,46 @@
+package rtpopus
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestEncode(t *testing.T) {
+	for _, ca := range cases {
+		t.Run(ca.name, func(t *testing.T) {
+			e := &Encoder{
+				PayloadType: 96,
+				SampleRate:  48000,
+				SSRC: func() *uint32 {
+					v := uint32(0x9dbb7812)
+					return &v
+				}(),
+				InitialSequenceNumber: func() *uint16 {
+					v := uint16(0x44ed)
+					return &v
+				}(),
+				InitialTimestamp: func() *uint32 {
+					v := uint32(0x88776655)
+					return &v
+				}(),
+			}
+			e.Init()
+
+			pkt, err := e.Encode(ca.op, ca.pts)
+			require.NoError(t, err)
+			require.Equal(t, ca.pkt, pkt)
+		})
+	}
+}
+
+func TestEncodeRandomInitialState(t *testing.T) {
+	e := &Encoder{
+		PayloadType: 96,
+		SampleRate:  48000,
+	}
+	e.Init()
+	require.NotEqual(t, nil, e.SSRC)
+	require.NotEqual(t, nil, e.InitialSequenceNumber)
+	require.NotEqual(t, nil, e.InitialTimestamp)
+}