如何在 Javascript 中获取音频的分贝级别

How do you get the decibel level of an audio in Javascript

本文关键字：音频 获取 Javascript      更新时间：2023-09-26

我目前正在使用JavaScript，HTML和CSS制作分贝计可视化工具。

我已经浏览了几个 Web 音频 API 教程，但其中没有任何内容接近于我想做的事情。

这是我到目前为止所拥有的：

window.onload = init;
function init() {
  
  var ctx = new webkitAudioContext()
    , url = 'https://dl.dropboxusercontent.com/u/86176287/pbjt.mp3'  
    , audio = new Audio(url)
    // 2048 sample buffer, 1 channel in, 1 channel out  
    , processor = ctx.createJavaScriptNode(2048, 1, 1)
    , meter = document.getElementById('meter')
    , source;
    
  audio.addEventListener('canplaythrough', function(){
    source = ctx.createMediaElementSource(audio);
    source.connect(processor);
    source.connect(ctx.destination);
    processor.connect(ctx.destination);
    audio.play();
  }, false);
  
  // loop through PCM data and calculate average
  // volume for a given 2048 sample buffer
  processor.onaudioprocess = function(evt){
    var input = evt.inputBuffer.getChannelData(0)
      , len = input.length   
      , total = i = 0
      , rms;
    while ( i < len ) total += Math.abs( input[i++] );
    rms = Math.sqrt( total / len );
    meter.style.width = ( rms * 100 ) + '%';
  };
  
}

有人可以解释我需要做什么，或者指出我正确的方向，因为这似乎不起作用？

固定

所以这就是我把它改成的：

var audioCtx = new AudioContext();
var url = 'https://dl.dropboxusercontent.com/u/86176287/pbjt.mp3';
var audio = new Audio(url);
var processor = audioCtx.createScriptProcessor(2048, 1, 1);
var meter = document.getElementById('meter');
var source;
audio.addEventListener('canplaythrough', function(){
source = audioCtx.createMediaElementSource(audio);
source.connect(processor);
source.connect(audioCtx.destination);
processor.connect(audioCtx.destination);
//audio.play();
}, false);
// loop through PCM data and calculate average
// volume for a given 2048 sample buffer
processor.onaudioprocess = function(evt){
var input = evt.inputBuffer.getChannelData(0)
  , len = input.length   
  , total = i = 0
  , rms;
while ( i < len ) total += Math.abs( input[i++] );
rms = Math.sqrt( total / len );
//console.log(( rms * 100 ));
};
相关文章：