const ctx = tt.getAudioContext();
const audio = ctx.createAudio();
audio.src = "xxxx.mp3";
audio.oncanplay = () => {
  audio.play();
};
const source = ctx.createMediaElementSource(audio);
const analyser = ctx.createAnalyser();
source.connect(analyser);
var bufferLength = analyser.frequencyBinCount;
var dataArray = new Uint8Array(bufferLength);
analyser.getByteTimeDomainData(dataArray);
// 获取画板
var canvas = tt.createCanvas();
var canvasCtx = canvas.getContext("2d");
// 把音频数据画到canvas上
function draw() {
  requestAnimationFrame(draw);
  analyser.getByteTimeDomainData(dataArray);
  canvasCtx.fillStyle = "rgb(200, 200, 200)";
  canvasCtx.fillRect(0, 0, canvas.width, canvas.height);
  canvasCtx.lineWidth = 2;
  canvasCtx.strokeStyle = "rgb(0, 0, 0)";
  canvasCtx.beginPath();
  var sliceWidth = (canvas.width * 1.0) / bufferLength;
  var x = 0;
  for (var i = 0; i < bufferLength; i++) {
    var v = dataArray[i] / 128.0;
    var y = (v * canvas.height) / 2;
    if (i === 0) {
      canvasCtx.moveTo(x, y);
    } else {
      canvasCtx.lineTo(x, y);
    }
    x += sliceWidth;
  }
  canvasCtx.lineTo(canvas.width, canvas.height / 2);
  canvasCtx.stroke();
}
draw();

const ctx = tt.getAudioContext();
const audio = ctx.createAudio();
audio.src = "xxxx.mp3";
audio.oncanplay = () => {
  audio.play();
};
const source = ctx.createMediaElementSource(audio);
const analyser = ctx.createAnalyser();
source.connect(analyser);
var bufferLength = analyser.frequencyBinCount;
var array = new Uint8Array(bufferLength);
analyser.getByteFrequencyData(array);
let values = 0;
const arrlength = array.length;
// 获取频率振幅
for (let i = 0; i < arrlength; i++) {
  values += array[i];
}
//通过平均值去到当前音量数据
const average = values / arrlength;
const data = average;
//返回数据
var volume = {
  data: new Float32Array([data]),
  size: 1,
  time: new Float32Array([Date.now()]),
};
const systemInfo = tt.getSystemInfoSync();
if (systemInfo.platform === "ios") {
  tt.onShow(() => {
    source.connect(analyser);
  });
  tt.onHide(() => {
    source.disconnect(analyser);
  });
}