test hls ll

format/fmp4/fmp4io/error.go

@@ -0,0 +1,37 @@
+package fmp4io
+
+import (
+	"fmt"
+	"strings"
+)
+
+type ParseError struct {
+	Debug  string
+	Offset int
+	prev   *ParseError
+	orig   error
+}
+
+func (a *ParseError) Error() string {
+	s := []string{}
+	for p := a; p != nil; p = p.prev {
+		s = append(s, fmt.Sprintf("%s:%d", p.Debug, p.Offset))
+		if p.prev == nil && p.orig != nil {
+			s = append(s, p.orig.Error())
+		}
+	}
+	return "mp4io: parse error: " + strings.Join(s, ",")
+}
+
+func parseErr(debug string, offset int, prev error) (err error) {
+	_prev, _ := prev.(*ParseError)
+	if _prev != nil {
+		prev = nil
+	}
+	return &ParseError{
+		Debug:  debug,
+		Offset: offset,
+		prev:   _prev,
+		orig:   prev,
+	}
+}