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

Solution 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/

Solution 2

I figured out one solution, but would still welcome others related to recorderjs. I used MP3RecorderJS at https://github.com/icatcher-at/MP3RecorderJS. The demo html works if you change the top of the html from src="js/jquery.min.js" and src="js/mp3recorder.js" to wherever they're located in your server. For me, it is src="jquery.min.js" and src="mp3recorder.js" I also had to do the same thing to the "mp3recorder.js" file: var RECORDER_WORKER_PATH = 'js/recorderWorker.js'; var ENCODER_WORKER_PATH = 'js/mp3Worker.js'; changed to var RECORDER_WORKER_PATH = 'recorderWorker.js'; var ENCODER_WORKER_PATH = 'mp3Worker.js';

The program is set up to record both mp3 and wav. I wanted wav, so I made a few more adjustments to the html file. At line 55 you'll find:

recorderObject.exportMP3(function(base64_mp3_data) {
      var url = 'data:audio/mp3;base64,' + base64_mp3_data;
      var au  = document.createElement('audio'); 

I changed that to:

recorderObject.exportWAV(function(base64_wav_data) {
      var url = 'data:audio/wav;base64,' + base64_wav_data;
      var au  = document.createElement('audio');   

The demo appends a new player each time you record. To prevent this, I deleted (commented out) the $recorder.append(au); part, made a new div to store the audio player, and then I clear that div each time, before the audio player is created. To upload to my server, I used a technique I learned from uploading images to a server save canvas image to server Basically, the "url" variable in line 56 was what I needed, but couldn't figure out how to put it in a universal variable to use by another function. So, I made a hidden div and made the contents of it equal to "url". I then referenced that div in a new function called "upload". I then used a php file called "uploadWav.php". I still have to figure out a way to activate and deactivate the upload button to prevent the user from uploading a blank file before recording, but that's another issue. Here's the final html and php that worked for me:

<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8">
    <title>MP3 Recorder test</title>
  </head>
  <body id="index" onload="">

    <script type="text/javascript" src="jquery.min.js"></script>
    <script type="text/javascript" src="mp3recorder.js"></script>
    <script type="text/javascript">
    var audio_context;

    function __log(e, data) {
      log.innerHTML += "\n" + e + " " + (data || '');
    }

    $(function() {

      try {
    // webkit shim
    window.AudioContext = window.AudioContext || window.webkitAudioContext;
    navigator.getUserMedia = ( navigator.getUserMedia ||
                     navigator.webkitGetUserMedia ||
                     navigator.mozGetUserMedia ||
                     navigator.msGetUserMedia);
    window.URL = window.URL || window.webkitURL;

    var audio_context = new AudioContext;
    __log('Audio context set up.');
    __log('navigator.getUserMedia ' + (navigator.getUserMedia ? 'available.' : 'not  present!'));
  } catch (e) {
    alert('No web audio support in this browser!');
  }

  $('.recorder .start').on('click', function() {
    $this = $(this);
    $recorder = $this.parent();

    navigator.getUserMedia({audio: true}, function(stream) {
      var recorderObject = new MP3Recorder(audio_context, stream, { statusContainer:  $recorder.find('.status'), statusMethod: 'replace' });
      $recorder.data('recorderObject', recorderObject);

      recorderObject.start();
    }, function(e) { });
  });

  $('.recorder .stop').on('click', function() {
    $this = $(this);
    $recorder = $this.parent();

    recorderObject = $recorder.data('recorderObject');
    recorderObject.stop();

    recorderObject.exportWAV(function(base64_wav_data) {
      var url = 'data:audio/wav;base64,' + base64_wav_data;
      var au  = document.createElement('audio');

      document.getElementById("playerContainer").innerHTML = "";
      //console.log(url)

      var duc = document.getElementById("dataUrlcontainer");
      duc.innerHTML = url;

      au.controls = true;
      au.src = url;
      //$recorder.append(au);
      $('#playerContainer').append(au);

      recorderObject.logStatus('');
    });

  });

  });
  </script>


 <script>
    function upload(){

    var dataURL = document.getElementById("dataUrlcontainer").innerHTML;

      $.ajax({
      type: "POST",
      url: "uploadWav.php",
      data: { 
          wavBase64: dataURL
       }
    }).done(function(o) {
      console.log('saved'); 

      });

    }    
  </script>


 <div class="recorder">
  Recorder 1
  <input type="button" class="start"  value="Record" />
  <input type="button" class="stop" value="Stop" />
  <pre class="status"></pre>
 </div>

 <div><button onclick="upload()">Upload</button></div>

 <div id="playerContainer"></div>

 <div id="dataUrlcontainer" hidden></div>

 <pre id="log"></pre>

 </body>
 </html>

and the "uploadWav.php" file:

<?php
// requires php5
define('UPLOAD_DIR', 'uploads/');
$img = $_POST['wavBase64'];
$img = str_replace('data:audio/wav;base64,', '', $img);
$img = str_replace(' ', '+', $img);
$data = base64_decode($img);
$file = UPLOAD_DIR . uniqid() . '.wav';
$success = file_put_contents($file, $data);
print $success ? $file : 'Unable to save the file.';
?> 

Comments

[Ael]

Dead github link.

[Zedd]

This github link from @AliRasouli is dead too man...