improve coverage

pkg/format/lpcm_test.go

@@ -1,6 +1,8 @@
 package format
 
 import (
+	"fmt"
+	"strconv"
 	"testing"
 
 	"github.com/pion/rtp"
@@ -21,14 +23,37 @@ func TestLPCMAttributes(t *testing.T) {
 }
 
 func TestLPCMMediaDescription(t *testing.T) {
+	for _, ca := range []int{8, 16, 24} {
+		t.Run(strconv.FormatInt(int64(ca), 10), func(t *testing.T) {
+			format := &LPCM{
+				PayloadTyp:   96,
+				BitDepth:     ca,
+				SampleRate:   96000,
+				ChannelCount: 2,
+			}
+
+			rtpmap, fmtp := format.Marshal()
+			require.Equal(t, fmt.Sprintf("L%d/96000/2", ca), rtpmap)
+			require.Equal(t, "", fmtp)
+		})
+	}
+}
+
+func TestLPCMDecEncoder(t *testing.T) {
 	format := &LPCM{
 		PayloadTyp:   96,
-		BitDepth:     24,
+		BitDepth:     16,
 		SampleRate:   96000,
 		ChannelCount: 2,
 	}
 
-	rtpmap, fmtp := format.Marshal()
-	require.Equal(t, "L24/96000/2", rtpmap)
-	require.Equal(t, "", fmtp)
+	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)
 }