Add existing code

src/lib/utils.js

@@ -0,0 +1,22 @@
+export function calculateLineHeadPosition (ev, element) {
+  let progressWidth = element.getBoundingClientRect().width
+  let leftPosition = ev.target.getBoundingClientRect().left
+  let pos = (ev.clientX - leftPosition) / progressWidth
+
+  try {
+    if (!ev.target.className.match(/^ar\-line\-control/)) {
+      return
+    }
+  } catch (err) {
+    return
+  }
+
+  pos = pos < 0 ? 0 : pos
+  pos = pos > 1 ? 1 : pos
+
+  return pos
+}
+
+export function convertTimeMMSS (seconds) {
+  return new Date(seconds * 1000).toISOString().substr(14, 5)
+}