_drawPlaytime: function (cx, cy) {
      if(this.audio != null){
        var currentTime = this.audio.currentTime || 0
        var duration    = this.audio.duration || 1
        const m = Math.floor(currentTime / 60)
        const sec = Math.floor(currentTime) % 60
        const s = sec < 10 ? `0${sec}` : `${sec}`
        const text = `${m}:${s}`
        const tsizew = Math.ceil(this.ctx.measureText(text).width)
        this.ctx.font = this.playtimeFont
        this.ctx.fillStyle = this.playtimeColor
        this.ctx.fillText(text, cx - Math.round(tsizew / 2), cy + 0.25 * parseInt(this.playtimeFont))
      }

    },