add AC-3 decoder and encoder (#427)

pkg/format/rtpac3/decoder_test.go

@@ -0,0 +1,70 @@
+package rtpac3
+
+import (
+	"testing"
+
+	"github.com/pion/rtp"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDecode(t *testing.T) {
+	for _, ca := range cases {
+		t.Run(ca.name, func(t *testing.T) {
+			d := &Decoder{}
+			err := d.Init()
+			require.NoError(t, err)
+
+			var frames [][]byte
+
+			for _, pkt := range ca.pkts {
+				clone := pkt.Clone()
+
+				addFrames, err := d.Decode(pkt)
+
+				// test input integrity
+				require.Equal(t, clone, pkt)
+
+				if err == ErrMorePacketsNeeded {
+					continue
+				}
+
+				require.NoError(t, err)
+				frames = append(frames, addFrames...)
+			}
+
+			require.Equal(t, ca.frames, frames)
+		})
+	}
+}
+
+func FuzzDecoder(f *testing.F) {
+	f.Fuzz(func(t *testing.T, a []byte, am bool, b []byte, bm bool) {
+		d := &Decoder{}
+		err := d.Init()
+		require.NoError(t, err)
+
+		d.Decode(&rtp.Packet{ //nolint:errcheck
+			Header: rtp.Header{
+				Version:        2,
+				Marker:         am,
+				PayloadType:    96,
+				SequenceNumber: 17645,
+				Timestamp:      2289527317,
+				SSRC:           0x9dbb7812,
+			},
+			Payload: a,
+		})
+
+		d.Decode(&rtp.Packet{ //nolint:errcheck
+			Header: rtp.Header{
+				Version:        2,
+				Marker:         bm,
+				PayloadType:    96,
+				SequenceNumber: 17646,
+				Timestamp:      2289527317,
+				SSRC:           0x9dbb7812,
+			},
+			Payload: b,
+		})
+	})
+}