Examples: Make examples/util internal

Resolves #424

examples/save-to-disk/main.go

@@ -6,8 +6,9 @@ import (
 
 	"github.com/pions/rtcp"
 	"github.com/pions/webrtc"
-	"github.com/pions/webrtc/examples/util"
 	"github.com/pions/webrtc/pkg/media/ivfwriter"
+
+	"github.com/pions/webrtc/examples/internal/signal"
 )
 
 func main() {
@@ -29,7 +30,9 @@ func main() {
 
 	// Create a new RTCPeerConnection
 	peerConnection, err := webrtc.NewPeerConnection(config)
-	util.Check(err)
+	if err != nil {
+		panic(err)
+	}
 
 	// Set a handler for when a new remote track starts, this handler saves buffers to disk as
 	// an ivf file, since we could have multiple video tracks we provide a counter.
@@ -50,10 +53,14 @@ func main() {
 		if track.Codec.Name == webrtc.VP8 {
 			fmt.Println("Got VP8 track, saving to disk as output.ivf")
 			i, err := ivfwriter.New("output.ivf")
-			util.Check(err)
+			if err != nil {
+				panic(err)
+			}
 			for {
 				err = i.AddPacket(<-track.Packets)
-				util.Check(err)
+				if err != nil {
+					panic(err)
+				}
 			}
 		}
 	})
@@ -66,22 +73,28 @@ func main() {
 
 	// Wait for the offer to be pasted
 	offer := webrtc.SessionDescription{}
-	util.Decode(util.MustReadStdin(), &offer)
+	signal.Decode(signal.MustReadStdin(), &offer)
 
 	// Set the remote SessionDescription
 	err = peerConnection.SetRemoteDescription(offer)
-	util.Check(err)
+	if err != nil {
+		panic(err)
+	}
 
 	// Create answer
 	answer, err := peerConnection.CreateAnswer(nil)
-	util.Check(err)
+	if err != nil {
+		panic(err)
+	}
 
 	// Sets the LocalDescription, and starts our UDP listeners
 	err = peerConnection.SetLocalDescription(answer)
-	util.Check(err)
+	if err != nil {
+		panic(err)
+	}
 
 	// Output the answer in base64 so we can paste it in browser
-	fmt.Println(util.Encode(answer))
+	fmt.Println(signal.Encode(answer))
 
 	// Block forever
 	select {}