Question

显然，Safari的分析器节点没有getFloatTimeDomainData方法Here you can see the error。我正在寻找一个类似的功能，该功能可以将当前波形或时域数据复制到Float32Array中，并且可以在safari的浏览器中使用。

window.AudioContext = window.AudioContext || window.webkitAudioContext;
var buflen = 1024;
var buf = new Float32Array( buflen );
audioContext = new AudioContext();
MAX_SIZE = Math.max(4,Math.floor(audioContext.sampleRate/5000));
navigator.getUserMedia = navigator.getUserMedia ||
                   navigator.webkitGetUserMedia ||
                   navigator.mozGetUserMedia ||
                   navigator.msGetUserMedia;

navigator.mediaDevices.getUserMedia({audio: true})
        .then(function(stream) {
      gotStreamPre(stream);
    });

 function gotStreamPre(stream) {
  // Create an AudioNode from the stream.
  mediaStreamSource = audioContext.createMediaStreamSource(stream);
  // Connect it to the destination.
  analyser = audioContext.createAnalyser();
  analyser.fftSize = 2048;
  mediaStreamSource.connect( analyser );
  updatePitchPre();
 }

function updatePitchPre( time ) {
  if(analyser!=null){
     var cycles = new Array;
     analyser.getFloatTimeDomainData( buf );//not working on Safari
     var ac = autoCorrelatePre( buf , audioContext.sampleRate );
  if (ac > -1) {

    }
  if (!window.requestAnimationFrame)
       window.requestAnimationFrame = window.webkitRequestAnimationFrame;
       rafID = window.requestAnimationFrame( updatePitchPre );
   }
}

Answer 1

我有同样的问题，你可以添加这个：

if (analyser && !analyser.getFloatTimeDomainData) {
    var r = new Uint8Array(2048);
    analyser.getFloatTimeDomainData = function(e) {
        analyser.getByteTimeDomainData(r);
        for (var t = 0, o = e.length; o > t; t++) e[t] = .0078125 * (r[t] - 128)
    }
}

Safari中不存在Analyser.getFloatTimeDomainData（）

1 个答案: