codec/h264/lex.go: fixed bug in handleFUA

codec/h264/lex.go

@@ -266,19 +266,19 @@ func (l *RTPLexer) handleFUA(d []byte) {
 	// If start, form new header, skip FU indicator only and set first byte to
 	// new header. Otherwise, skip over both FU indicator and FU header.
 	if start {
+		newHead := (d[0] & 0xe0) | (d[1] & 0x1f)
+		d = d[1:]
+		d[0] = newHead
 		if end {
 			panic("bad fragmentation packet")
 		}
-		newHead := (d[0] & 0xe0) | (d[0] & 0x1f)
-		d = d[1:]
-		d[0] = newHead
 		l.frag = true
 		l.writeWithPrefix(d)
 	} else {
+		d = d[2:]
 		if end {
 			l.frag = false
 		}
-		d = d[2:]
 		l.writeNoPrefix(d)
 	}
 }