javascript - Chrome Extension Capture Tab Audio -

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i'm trying create chrome extension captures audio active tab , either sends server or makes accessible via url.

i'm using chrome.tabcapture.capture api , can mediastream of tab's audio, don't know after that.

the chrome docs have nothing mediastreams i've looked through documentation here , played js debugger see methods available, can't find way send mediastream somewhere.

it's possible record stream locally in js using mediarecorder. there demo here , w3c spec here

the method startrecording in demo requires window.stream set mediastream instance.

// nested try blocks simplified when chrome 47 moves stable var mediarecorder; var recordedblobs; window.stream = mymediastreaminstance; function startrecording() {   var options = {mimetype: 'video/webm', bitspersecond: 100000};   recordedblobs = [];   try {     mediarecorder = new mediarecorder(window.stream, options);   } catch (e0) {     console.log('unable create mediarecorder options object: ', e0);     try {       options = {mimetype: 'video/webm,codecs=vp9', bitspersecond: 100000};       mediarecorder = new mediarecorder(window.stream, options);     } catch (e1) {       console.log('unable create mediarecorder options object: ', e1);       try {         options = 'video/vp8'; // chrome 47         mediarecorder = new mediarecorder(window.stream, options);       } catch (e2) {         alert('mediarecorder not supported browser.\n\n' +             'try firefox 29 or later, or chrome 47 or later, enable experimental web platform features enabled chrome://flags.');         console.error('exception while creating mediarecorder:', e2);         return;       }     }   }   console.log('created mediarecorder', mediarecorder, 'with options', options);    // ui cleanup here   mediarecorder.onstop = function() {/** stop */};   mediarecorder.ondataavailable = function() {/** data avail */};   mediarecorder.start(10); // collect 10ms of data   console.log('mediarecorder started', mediarecorder); }
  1. https://www.w3.org/tr/mediastream-recording/
  2. https://simpl.info/mediarecorder/

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