使用JavaScript将wav转换为mp3 [英] convert wav to mp3 using javascript

问题描述

下面是一段代码，我想将wav formate转换为mp3。提到Record.js。但它已经过去了。谁能解决这个问题？ （View包含空的DataView，即DataView {}）

  var blob = new Blob（[view]，{type：'音频/ wav'}）; 
 
 //让我们在本地保存
 outputElement.innerHTML ='现在移交文件......'; 
 var url =（window.URL || window.webkitURL）.createObjectURL（blob）; 
 var link = window.document.createElement（'a'）; 
 link.href = url; 
 link.download ='output.wav'; 
 var click = document.createEvent（Event）; 
 click.initEvent（click，true，true）; 
 link.dispatchEvent（click）; 
 audioplayer.src = url; 
  

解决方案

您可以使用 Recordmp3js ，因为它会直接提供mp3音频。

<如果你想了解它，我实现了一个非常简单的版本 here 即可。请注意，使用此实现转换的wav需要是单声道的，否则结果将变得混乱。

  var convert = function（）{
 var arrayBuffer = this.result; 
 var buffer = new Uint8Array（arrayBuffer）; 
 
 data = parseWav（buffer）; 
 
 var config = {
 mode：3，
 channels：1，
 samplerate：data.sampleRate，
 bitrate：data.bitsPerSample 
}; 
 
 var mp3codec = Lame.init（）; 
 Lame.set_mode（mp3codec，config.mode || Lame.JOINT_STEREO）; 
 Lame.set_num_channels（mp3codec，config.channels || 2）; 
 Lame.set_num_samples（mp3codec，config.samples || -1）; 
 Lame.set_in_samplerate（mp3codec，config.samplerate || 44100）; 
 Lame.set_out_samplerate（mp3codec，config.samplerate || 44100）; 
 Lame.set_bitrate（mp3codec，config.bitrate || 128）; 
 Lame.init_params（mp3codec）; 
 
 var array = Uint8ArrayToFloat32Array（data.samples）; 
 
 var mp3data = Lame.encode_buffer_ieee_float（mp3codec，array，array）; 
 
 var url ='data：audio / mp3; base64，'+ encode64（mp3data.data）; 
 convertedPlayer.src = url; 
 convertedLink.href = url; 
 
 var name = file.name.substr（0，file.name.lastIndexOf（'。'））; 
 convertedLink.textContent = name +'。mp3'; 
 
 converted.style.display ='block'; 
 
 Lame.encode_flush（mp3codec）; 
 Lame.close（mp3codec）; 
 mp3codec = null; 
}; 
  

• 了解关于recordmp3-js的更多信息


• 了解更多关于Wav的信息

Below is a code, I would like to convert wav formate to mp3. Refered to Record.js. But it is going over my head. Can anyone solve this? (View consists of empty DataView i.e, DataView {})

var blob = new Blob ( [ view ], { type : 'audio/wav' } );

    // let's save it locally
    outputElement.innerHTML = 'Handing off the file now...';
    var url = (window.URL || window.webkitURL).createObjectURL(blob);
    var link = window.document.createElement('a');
    link.href = url;
    link.download = 'output.wav';
    var click = document.createEvent("Event");
    click.initEvent("click", true, true);
    link.dispatchEvent(click);
    audioplayer.src = url;

解决方案

You can use Recordmp3js since it will give the mp3 audio directly.

If you want to understand it, I implemented a very simple version here. Notice that the wavs converted with this implementation need to be mono or the result will be messy.

var convert = function(){
    var arrayBuffer = this.result;
    var buffer = new Uint8Array(arrayBuffer);

    data = parseWav(buffer);

    var config = {
      mode : 3,
      channels:1,
      samplerate: data.sampleRate,
      bitrate: data.bitsPerSample
    };

    var mp3codec = Lame.init();
    Lame.set_mode(mp3codec, config.mode || Lame.JOINT_STEREO);
    Lame.set_num_channels(mp3codec, config.channels || 2);
    Lame.set_num_samples(mp3codec, config.samples || -1);
    Lame.set_in_samplerate(mp3codec, config.samplerate || 44100);
    Lame.set_out_samplerate(mp3codec, config.samplerate || 44100);
    Lame.set_bitrate(mp3codec, config.bitrate || 128);    
    Lame.init_params(mp3codec);

    var array = Uint8ArrayToFloat32Array(data.samples);

    var mp3data = Lame.encode_buffer_ieee_float(mp3codec, array, array);

    var url = 'data:audio/mp3;base64,'+encode64(mp3data.data);
    convertedPlayer.src = url;
    convertedLink.href = url;

    var name = file.name.substr(0, file.name.lastIndexOf('.'));
    convertedLink.textContent = name + '.mp3';

    converted.style.display = 'block';

    Lame.encode_flush(mp3codec);
    Lame.close(mp3codec);
    mp3codec = null;
};

• Read more about recordmp3-js
• Read more about Wav

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