rewrite unmarshaling interface and tests of formats (#238)

pkg/formats/mpeg4_audio_latm_test.go

@@ -21,22 +21,3 @@ func TestMPEG4AudioLATMAttributes(t *testing.T) {
 	require.Equal(t, uint8(96), format.PayloadType())
 	require.Equal(t, true, format.PTSEqualsDTS(&rtp.Packet{}))
 }
-
-func TestMPEG4AudioLATMMediaDescription(t *testing.T) {
-	format := &MPEG4AudioLATM{
-		PayloadTyp:     96,
-		SampleRate:     48000,
-		Channels:       2,
-		Object:         2,
-		ProfileLevelID: 1,
-		Config:         []byte{0x01, 0x02, 0x03},
-	}
-
-	rtpmap, fmtp := format.Marshal()
-	require.Equal(t, "MP4A-LATM/48000/2", rtpmap)
-	require.Equal(t, map[string]string{
-		"profile-level-id": "1",
-		"object":           "2",
-		"config":           "010203",
-	}, fmtp)
-}