Read some bytes

go.mod

@@ -0,0 +1,3 @@
+module git.netflux.io/rob/avframes
+
+go 1.15

internal/mpeg/mpeg.go

@@ -0,0 +1 @@
+package mpeg

main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"log"
+	"os"
+)
+
+const fname = "/home/rob/Desktop/example.mp3"
+
+const syncHeader1 = 0xFF
+const syncHeader2 = 0xFE
+
+func main() {
+	f, err := os.Open(fname)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	bufreader := bufio.NewReader(f)
+
+	buf := make([]byte, 4)
+	var i int
+	for {
+		_, err := io.ReadFull(bufreader, buf)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		if parseBytes(buf) {
+			fmt.Printf("Got possible header %X at %d\n", buf, i)
+		}
+
+		i++
+		bufreader.UnreadByte()
+	}
+}
+
+func parseBytes(buf []byte) bool {
+	return buf[0]&syncHeader1 == syncHeader1 || buf[0]&syncHeader2 == syncHeader2
+}