Remove examples/internal

Users find it frustrating that example code doesn't work out of tree.
This makes copying the examples out of the repo easier.

Relates to pion/webrtc#1981

c-data-channels/Makefile

@@ -4,7 +4,7 @@
 c-data-channels: webrtc.so data-channels.c
 	gcc -o $@ data-channels.c ./webrtc.so
 
-webrtc.so: webrtc.go bridge.go
+webrtc.so: main.go bridge.go
 	go build -o $@ -buildmode=c-shared $^
 
 clean:

c-data-channels/README.md

@@ -1,5 +1,5 @@
 # c-data-channels
-c-data-channels is a Pion WebRTC application that shows how you can send/recv DataChannel messages from a web browser that's 
+c-data-channels is a Pion WebRTC application that shows how you can send/recv DataChannel messages from a web browser that's
 mostly identical to the pure Go implementation, https://github.com/pion/webrtc/tree/master/examples/data-channels.
 The main difference is that the OnDataChannel is fully implemented in C.
 
@@ -47,10 +47,10 @@ Congrats, you have used Pion WebRTC! Now start building something cool
 ### bridge.go
 This file contains all of the bridging between Go and C. This is the only file that contains cgo stuff.
 
-### webrtc.go
+### main.go
 This file is pure Go. It is mostly identical to the original data-channel example.
 
 ### Reference
 * https://github.com/golang/go/issues/20639
 * https://github.com/golang/go/issues/25832
-* https://github.com/pion/webrtc/tree/master/examples/data-channels/jsfiddle - jsfiddle source codes
+* https://github.com/pion/webrtc/tree/master/examples/data-channels/jsfiddle - jsfiddle source codes

c-data-channels/webrtc.go → c-data-channels/main.go

@@ -4,9 +4,15 @@
 package main
 
 import (
+	"bufio"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
 	"fmt"
+	"io"
+	"os"
+	"strings"
 
-	"github.com/pion/example-webrtc-applications/v3/internal/signal"
 	"github.com/pion/webrtc/v3"
 )
 
@@ -43,7 +49,7 @@ func Run(f func(*webrtc.DataChannel)) {
 
 	// Wait for the offer to be pasted
 	offer := webrtc.SessionDescription{}
-	signal.Decode(signal.MustReadStdin(), &offer)
+	decode(readUntilNewline(), &offer)
 
 	// Set the remote SessionDescription
 	err = peerConnection.SetRemoteDescription(offer)
@@ -72,10 +78,52 @@ func Run(f func(*webrtc.DataChannel)) {
 	<-gatherComplete
 
 	// Output the answer in base64 so we can paste it in browser
-	fmt.Println(signal.Encode(*peerConnection.LocalDescription())) //nolint
+	fmt.Println(encode(peerConnection.LocalDescription())) //nolint
 
 	// Block forever
 	select {}
 }
 
 func main() {}
+
+// Read from stdin until we get a newline
+func readUntilNewline() (in string) {
+	var err error
+
+	r := bufio.NewReader(os.Stdin)
+	for {
+		in, err = r.ReadString('\n')
+		if err != nil && !errors.Is(err, io.EOF) {
+			panic(err)
+		}
+
+		if in = strings.TrimSpace(in); len(in) > 0 {
+			break
+		}
+	}
+
+	fmt.Println("")
+	return
+}
+
+// JSON encode + base64 a SessionDescription
+func encode(obj *webrtc.SessionDescription) string {
+	b, err := json.Marshal(obj)
+	if err != nil {
+		panic(err)
+	}
+
+	return base64.StdEncoding.EncodeToString(b)
+}
+
+// Decode a base64 and unmarshal JSON into a SessionDescription
+func decode(in string, obj *webrtc.SessionDescription) {
+	b, err := base64.StdEncoding.DecodeString(in)
+	if err != nil {
+		panic(err)
+	}
+
+	if err = json.Unmarshal(b, obj); err != nil {
+		panic(err)
+	}
+}

ffmpeg-send/main.go

@@ -8,12 +8,17 @@
 package main
 
 import (
+	"bufio"
+	"encoding/base64"
+	"encoding/json"
 	"errors"
 	"fmt"
+	"io"
+	"os"
+	"strings"
 	"time"
 
 	"github.com/asticode/go-astiav"
-	"github.com/pion/example-webrtc-applications/v3/internal/signal"
 	"github.com/pion/webrtc/v3"
 	"github.com/pion/webrtc/v3/pkg/media"
 )
@@ -48,7 +53,7 @@ func main() {
 
 	// Wait for the offer to be pasted
 	offer := webrtc.SessionDescription{}
-	signal.Decode(signal.MustReadStdin(), &offer)
+	decode(readUntilNewline(), &offer)
 
 	// Set the remote SessionDescription
 	err = peerConnection.SetRemoteDescription(offer)
@@ -74,7 +79,7 @@ func main() {
 	<-gatherComplete
 
 	// Output the answer in base64 so we can paste it in browser
-	fmt.Println(signal.Encode(*peerConnection.LocalDescription()))
+	fmt.Println(encode(peerConnection.LocalDescription()))
 
 	// Start pushing buffers on these tracks
 	writeH264ToTrack(videoTrack)
@@ -264,3 +269,45 @@ func freeVideoCoding() {
 	encodeCodecContext.Free()
 	encodePacket.Free()
 }
+
+// Read from stdin until we get a newline
+func readUntilNewline() (in string) {
+	var err error
+
+	r := bufio.NewReader(os.Stdin)
+	for {
+		in, err = r.ReadString('\n')
+		if err != nil && !errors.Is(err, io.EOF) {
+			panic(err)
+		}
+
+		if in = strings.TrimSpace(in); len(in) > 0 {
+			break
+		}
+	}
+
+	fmt.Println("")
+	return
+}
+
+// JSON encode + base64 a SessionDescription
+func encode(obj *webrtc.SessionDescription) string {
+	b, err := json.Marshal(obj)
+	if err != nil {
+		panic(err)
+	}
+
+	return base64.StdEncoding.EncodeToString(b)
+}
+
+// Decode a base64 and unmarshal JSON into a SessionDescription
+func decode(in string, obj *webrtc.SessionDescription) {
+	b, err := base64.StdEncoding.DecodeString(in)
+	if err != nil {
+		panic(err)
+	}
+
+	if err = json.Unmarshal(b, obj); err != nil {
+		panic(err)
+	}
+}

gocv-receive/main.go

@@ -8,16 +8,20 @@ package main
 
 import (
 	"bufio"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
 	"fmt"
 	"image"
 	"image/color"
 	"io"
+	"os"
 	"os/exec"
 	"runtime"
 	"strconv"
+	"strings"
 	"time"
 
-	"github.com/pion/example-webrtc-applications/v3/internal/signal"
 	"github.com/pion/rtcp"
 	"github.com/pion/webrtc/v3"
 	"github.com/pion/webrtc/v3/pkg/media/ivfwriter"
@@ -187,7 +191,7 @@ func createWebRTCConn(ffmpegIn io.Writer) {
 
 	// Wait for the offer to be pasted
 	offer := webrtc.SessionDescription{}
-	signal.Decode(signal.MustReadStdin(), &offer)
+	decode(readUntilNewline(), &offer)
 
 	// Set the remote SessionDescription
 	err = peerConnection.SetRemoteDescription(offer)
@@ -216,5 +220,47 @@ func createWebRTCConn(ffmpegIn io.Writer) {
 	<-gatherComplete
 
 	// Output the answer in base64 so we can paste it in browser
-	fmt.Println(signal.Encode(*peerConnection.LocalDescription()))
+	fmt.Println(encode(peerConnection.LocalDescription()))
+}
+
+// Read from stdin until we get a newline
+func readUntilNewline() (in string) {
+	var err error
+
+	r := bufio.NewReader(os.Stdin)
+	for {
+		in, err = r.ReadString('\n')
+		if err != nil && !errors.Is(err, io.EOF) {
+			panic(err)
+		}
+
+		if in = strings.TrimSpace(in); len(in) > 0 {
+			break
+		}
+	}
+
+	fmt.Println("")
+	return
+}
+
+// JSON encode + base64 a SessionDescription
+func encode(obj *webrtc.SessionDescription) string {
+	b, err := json.Marshal(obj)
+	if err != nil {
+		panic(err)
+	}
+
+	return base64.StdEncoding.EncodeToString(b)
+}
+
+// Decode a base64 and unmarshal JSON into a SessionDescription
+func decode(in string, obj *webrtc.SessionDescription) {
+	b, err := base64.StdEncoding.DecodeString(in)
+	if err != nil {
+		panic(err)
+	}
+
+	if err = json.Unmarshal(b, obj); err != nil {
+		panic(err)
+	}
 }

gstreamer-receive/main.go

@@ -8,13 +8,18 @@
 package main
 
 import (
+	"bufio"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
 	"fmt"
+	"io"
+	"os"
 	"strings"
 	"time"
 
 	"github.com/go-gst/go-gst/gst"
 	"github.com/go-gst/go-gst/gst/app"
-	"github.com/pion/example-webrtc-applications/v3/internal/signal"
 	"github.com/pion/rtcp"
 	"github.com/pion/webrtc/v3"
 )
@@ -79,7 +84,7 @@ func main() {
 
 	// Wait for the offer to be pasted
 	offer := webrtc.SessionDescription{}
-	signal.Decode(signal.MustReadStdin(), &offer)
+	decode(readUntilNewline(), &offer)
 
 	// Set the remote SessionDescription
 	err = peerConnection.SetRemoteDescription(offer)
@@ -108,7 +113,7 @@ func main() {
 	<-gatherComplete
 
 	// Output the answer in base64 so we can paste it in browser
-	fmt.Println(signal.Encode(*peerConnection.LocalDescription()))
+	fmt.Println(encode(peerConnection.LocalDescription()))
 
 	// Block forever
 	select {}
@@ -148,3 +153,45 @@ func pipelineForCodec(track *webrtc.TrackRemote, codecName string) *app.Source {
 
 	return app.SrcFromElement(appSrc)
 }
+
+// Read from stdin until we get a newline
+func readUntilNewline() (in string) {
+	var err error
+
+	r := bufio.NewReader(os.Stdin)
+	for {
+		in, err = r.ReadString('\n')
+		if err != nil && !errors.Is(err, io.EOF) {
+			panic(err)
+		}
+
+		if in = strings.TrimSpace(in); len(in) > 0 {
+			break
+		}
+	}
+
+	fmt.Println("")
+	return
+}
+
+// JSON encode + base64 a SessionDescription
+func encode(obj *webrtc.SessionDescription) string {
+	b, err := json.Marshal(obj)
+	if err != nil {
+		panic(err)
+	}
+
+	return base64.StdEncoding.EncodeToString(b)
+}
+
+// Decode a base64 and unmarshal JSON into a SessionDescription
+func decode(in string, obj *webrtc.SessionDescription) {
+	b, err := base64.StdEncoding.DecodeString(in)
+	if err != nil {
+		panic(err)
+	}
+
+	if err = json.Unmarshal(b, obj); err != nil {
+		panic(err)
+	}
+}