install go2rtc on bob

installs_on_host/go2rtc/examples/tutk_decoder/README.md

@@ -0,0 +1,5 @@
+# tutk_decoder
+
+1. Wireshark > Select any packet > Follow > UDP Stream
+2. Wireshark > File > Export Packet Dissections > As JSON > Displayed, Values
+3. `tutk_decoder wireshark.json decoded.txt`

installs_on_host/go2rtc/examples/tutk_decoder/main.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+
+	"github.com/AlexxIT/go2rtc/pkg/tutk"
+)
+
+func main() {
+	if len(os.Args) != 3 {
+		fmt.Println("Usage: tutk_decoder wireshark.json decoded.txt")
+		return
+	}
+
+	src, err := os.Open(os.Args[1])
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer src.Close()
+
+	dst, err := os.Create(os.Args[2])
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer dst.Close()
+
+	var items []item
+	if err = json.NewDecoder(src).Decode(&items); err != nil {
+		log.Fatal(err)
+	}
+
+	var b []byte
+
+	for _, v := range items {
+		if v.Source.Layers.Data.DataData == "" {
+			continue
+		}
+
+		s := strings.ReplaceAll(v.Source.Layers.Data.DataData, ":", "")
+		b, err = hex.DecodeString(s)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		tutk.ReverseTransCodePartial(b, b)
+
+		ts := v.Source.Layers.Frame.FrameTimeRelative
+
+		_, _ = fmt.Fprintf(dst, "%8s: %s -> %s [%4d] %x\n",
+			ts[:len(ts)-6],
+			v.Source.Layers.Ip.IpSrc, v.Source.Layers.Ip.IpDst,
+			len(b), b)
+	}
+}
+
+type item struct {
+	Source struct {
+		Layers struct {
+			Frame struct {
+				FrameTimeRelative string `json:"frame.time_relative"`
+				FrameNumber       string `json:"frame.number"`
+			} `json:"frame"`
+			Ip struct {
+				IpSrc string `json:"ip.src"`
+				IpDst string `json:"ip.dst"`
+			} `json:"ip"`
+			Udp struct {
+				UdpSrcport string `json:"udp.srcport"`
+				UdpDstport string `json:"udp.dstport"`
+			} `json:"udp"`
+			Data struct {
+				DataData string `json:"data.data"`
+				DataLen  string `json:"data.len"`
+			} `json:"data"`
+		} `json:"layers"`
+	} `json:"_source"`
+}