waveform-playlist/lib/utils/timeformat.js

Multiple track web audio editor and player with waveform preview

export default function (format) {
  function clockFormat(seconds, decimals) {
    const hours = parseInt(seconds / 3600, 10) % 24;
    const minutes = parseInt(seconds / 60, 10) % 60;
    const secs = (seconds % 60).toFixed(decimals);
    const sHours = hours < 10 ? `0${hours}` : hours;
    const sMinutes = minutes < 10 ? `0${minutes}` : minutes;
    const sSeconds = secs < 10 ? `0${secs}` : secs;
    return `${sHours}:${sMinutes}:${sSeconds}`;
  }

  const formats = {
    seconds(seconds) {
      return seconds.toFixed(0);
    },

    thousandths(seconds) {
      return seconds.toFixed(3);
    },

    "hh:mm:ss": function hhmmss(seconds) {
      return clockFormat(seconds, 0);
    },
    "hh:mm:ss.u": function hhmmssu(seconds) {
      return clockFormat(seconds, 1);
    },
    "hh:mm:ss.uu": function hhmmssuu(seconds) {
      return clockFormat(seconds, 2);
    },
    "hh:mm:ss.uuu": function hhmmssuuu(seconds) {
      return clockFormat(seconds, 3);
    }
  };
  return formats[format];
}