improve coverage

pkg/format/mpeg4audio_test.go

@@ -45,3 +45,27 @@ func TestMPEG4AudioMediaDescription(t *testing.T) {
 	require.Equal(t, "profile-level-id=1; mode=AAC-hbr; sizelength=13;"+
 		" indexlength=3; indexdeltalength=3; config=1190", fmtp)
 }
+
+func TestMPEG4AudioDecEncoder(t *testing.T) {
+	format := &MPEG4Audio{
+		PayloadTyp: 96,
+		Config: &mpeg4audio.Config{
+			Type:         mpeg4audio.ObjectTypeAACLC,
+			SampleRate:   48000,
+			ChannelCount: 2,
+		},
+		SizeLength:       13,
+		IndexLength:      3,
+		IndexDeltaLength: 3,
+	}
+
+	enc := format.CreateEncoder()
+	pkts, err := enc.Encode([][]byte{{0x01, 0x02, 0x03, 0x04}}, 0)
+	require.NoError(t, err)
+	require.Equal(t, format.PayloadType(), pkts[0].PayloadType)
+
+	dec := format.CreateDecoder()
+	byts, _, err := dec.Decode(pkts[0])
+	require.NoError(t, err)
+	require.Equal(t, [][]byte{{0x01, 0x02, 0x03, 0x04}}, byts)
+}