javascript 使用javascript将wav转换为mp3
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convert wav to mp3 using javascript
提问by user3556610
Below is a code, I would like to convert wav format to mp3. Refereed to Record.js. But it is going over my head. Can anyone solve this? (View consists of empty DataView i.e, DataView {})
下面是一个代码，我想将wav格式转换为mp3。参考Record.js。但它正在超越我的头脑。任何人都可以解决这个问题吗？（视图由空的 DataView 组成，即 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;
采纳答案by rafaelcastrocouto
You can use Recordmp3jssince it will give the mp3 audio directly.
您可以使用Recordmp3js，因为它会直接提供 mp3 音频。
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.
如果你想理解它，我在这里实现了一个非常简单的版本。请注意，使用此实现转换的 wav 需要是单声道的，否则结果会很混乱。
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;
};
