add reset method for encoder

encoder.go

@@ -98,6 +98,12 @@ bridge_encoder_get_packet_loss_perc(OpusEncoder *st, opus_int32 *loss_perc)
 	return opus_encoder_ctl(st, OPUS_GET_PACKET_LOSS_PERC(loss_perc));
 }
 
+int
+bridge_encoder_reset_state(OpusEncoder *st)
+{
+	return opus_encoder_ctl(st, OPUS_RESET_STATE);
+}
+
 */
 import "C"
 
@@ -385,3 +391,12 @@ func (enc *Encoder) PacketLossPerc() (int, error) {
 	}
 	return int(lossPerc), nil
 }
+
+// Reset resets the codec state to be equivalent to a freshly initialized state.
+func (enc *Encoder) Reset() error {
+	res := C.bridge_encoder_reset_state(enc.p)
+	if res != C.OPUS_OK {
+		return Error(res)
+	}
+	return nil
+}

encoder_test.go

@@ -379,3 +379,15 @@ func TestEncoder_SetGetInvalidPacketLossPerc(t *testing.T) {
 		}
 	}
 }
+
+func TestEncoder_Reset(t *testing.T) {
+	enc, err := NewEncoder(48000, 1, AppVoIP)
+	if err != nil || enc == nil {
+		t.Errorf("Error creating new encoder: %v", err)
+	}
+	RunTestCodec(t, enc)
+	if err := enc.Reset(); err != nil {
+		t.Errorf("Error reset encoder: %v", err)
+	}
+	RunTestCodec(t, enc)
+}

opus_test.go

@@ -26,16 +26,21 @@ func TestOpusErrstr(t *testing.T) {
 }
 
 func TestCodec(t *testing.T) {
+	const SAMPLE_RATE = 48000
+	enc, err := NewEncoder(SAMPLE_RATE, 1, AppVoIP)
+	if err != nil || enc == nil {
+		t.Fatalf("Error creating new encoder: %v", err)
+	}
+	RunTestCodec(t, enc)
+}
+
+func RunTestCodec(t *testing.T, enc *Encoder) {
 	// Create bogus input sound
 	const G4 = 391.995
 	const SAMPLE_RATE = 48000
 	const FRAME_SIZE_MS = 60
 	const FRAME_SIZE = SAMPLE_RATE * FRAME_SIZE_MS / 1000
 	pcm := make([]int16, FRAME_SIZE)
-	enc, err := NewEncoder(SAMPLE_RATE, 1, AppVoIP)
-	if err != nil || enc == nil {
-		t.Fatalf("Error creating new encoder: %v", err)
-	}
 	addSine(pcm, SAMPLE_RATE, G4)
 	data := make([]byte, 1000)
 	n, err := enc.Encode(pcm, data)