record audio from user and save to server

Question

I'm trying to record audio from a website user and save the audio to my server. Many of the posts I have studied so far have referenced Matt Diamond's recorderjs. I attempted to recreate the demo at http://webaudiodemos.appspot.com/AudioRecorder/index.html by opening the source code through my browser. I copied the html, "audiodisplay.js", "recorder.js", and "main.js" and put them on my server. I also added the "recorderWorker.js" file from his GitHub site. In the recorder.js file, I changed var WORKER_PATH = 'js/recorderjs/recorderWorker.js' to var WORKER_PATH = 'recorderWorker.js';

When I run the demo I set up, I'm getting the "would you like to share your microphone.." warning and I can start the recording by pressing the mic icon on the right side. However, when I stop recording, the audio waveform doesn't show up below like in Matt's demo and the save icon doesn't become activated.

If I can get the demo up and running, the next problem I have is saving the wav file to the server instead of locally like in the demo. I've found several posts saying to use XMLHttpRequest(), however I can't really figure out how to connect those examples to recorderjs. Saving WAV File Recorded in Chrome to Server HTML5 & getUserMedia - Record Audio & Save to Web Server after Certain Time RecorderJS uploading recorded blob via AJAX

Answer 1

Using XMLHttpRequest to post wav or mp3 blobs to server is simple.

Just run this code wherever you have access to the blob element:

var xhr=new XMLHttpRequest();
xhr.onload=function(e) {
  if(this.readyState === 4) {
      console.log("Server returned: ",e.target.responseText);
  }
};
var fd=new FormData();
fd.append("audio_data",blob, "filename");
xhr.open("POST","upload.php",true);
xhr.send(fd);

I prefer XMLHttpRequest to $.ajax() because it does not require jQuery.

Server-side, upload.php is as simple as:

$input = $_FILES['audio_data']['tmp_name']; //temporary name that PHP gave to the uploaded file
$output = $_FILES['audio_data']['name'].".wav"; //letting the client control the filename is a rather bad idea

//move the file from temp name to local folder using $output name
move_uploaded_file($input, $output)

Source: https://addpipe.com/blog/using-recorder-js-to-capture-wav-audio-in-your-html5-web-site/ Live demo: https://addpipe.com/simple-recorderjs-demo/