wavesurfer.js | audio waveform player JavaScript library
要将weba文件转换为mp3格式，您可以使用HTML5的音频API来实现。以下是一个简单的示例代码：
```html
<!DOCTYPE html>
<html>
<head>
<title>WebA to MP3 Converter</title>
</head>
<body>
<input type="file" id="webaFileInput" accept="audio/webm, audio/webm;codecs=opus">
<button id="convertButton">Convert to MP3</button>
<a id="downloadLink" download="converted.mp3">Download MP3</a>
<script>
document.getElementById('convertButton').addEventListener('click', function() {
var webaFileInput = document.getElementById('webaFileInput');
var webaFile = webaFileInput.files[0];
var audio = new Audio();
audio.src = URL.createObjectURL(webaFile);
audio.controls = true;
audio.play();
var context = new AudioContext();
var source = context.createMediaElementSource(audio);
var destination = context.createMediaStreamDestination();
source.connect(destination);
var recorder = new MediaRecorder(destination.stream);
var chunks = [];
recorder.ondataavailable = function(e) {
chunks.push(e.data);
};
recorder.onstop = function(e) {
var blob = new Blob(chunks, { 'type' : 'audio/mp3' });
var url = URL.createObjectURL(blob);
var downloadLink = document.getElementById('downloadLink');
downloadLink.href = url;
downloadLink.click();
};
recorder.start();
audio.onended = function() {
recorder.stop();
};
});
</script>
</body>
</html>
```
在这个示例中，我们首先创建一个input元素，允许用户选择weba文件。然后，我们创建一个按钮，当用户点击按钮时，我们将weba文件转换为mp3格式并提供下载链接。我们使用HTML5的音频API来实现这一转换过程。
一个时尽量只用WaveSurfer。如果不行，就配合上面第一个里的：lame.min.js
大笨熊:
record = wavesurfer.registerPlugin(RecordPlugin.create({ scrollingWaveform, renderRecordedAudio: false,mimeType:'audio/webm' }))
大笨熊:
https://github.com/katspaugh/wavesurfer.js/blob/e9cd82c/src/plugins/record.ts#L7
大笨熊:
const MIME_TYPES = ['audio/webm', 'audio/wav', 'audio/mpeg', 'audio/mp4', 'audio/mp3']
const findSupportedMimeType = () => MIME_TYPES.find((mimeType) => MediaRecorder.isTypeSupported(mimeType))