I'm trying to create a Chrome extension that captures the audio from the active tab and either sends it to another server or makes it accessible via a URL.
I'm using the chrome.tabCapture.capture
API and can successfully get a MediaStream
of the tab's audio, but I don't know what to do after that.
The Chrome docs have nothing about MediaStreams so I've looked through some documentation here and played with the JS debugger to see what methods are available, but can't find a way to send the MediaStream somewhere.
It's now possible to record a stream locally in JS using MediaRecorder
. There is a demo here and the w3c spec is here
The method startRecording
in the demo requires window.stream
to be set to the MediaStream instance.
// The nested try blocks will be simplified when Chrome 47 moves to 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 to create MediaRecorder with options Object: ', e0);
try {
options = {mimeType: 'video/webm,codecs=vp9', bitsPerSecond: 100000};
mediaRecorder = new MediaRecorder(window.stream, options);
} catch (e1) {
console.log('Unable to create MediaRecorder with options Object: ', e1);
try {
options = 'video/vp8'; // Chrome 47
mediaRecorder = new MediaRecorder(window.stream, options);
} catch (e2) {
alert('MediaRecorder is not supported by this browser.\n\n' +
'Try Firefox 29 or later, or Chrome 47 or later, with Enable experimental Web Platform features enabled from chrome://flags.');
console.error('Exception while creating MediaRecorder:', e2);
return;
}
}
}
console.log('Created MediaRecorder', mediaRecorder, 'with options', options);
// do UI cleanup here
mediaRecorder.onstop = function() {/** stop */};
mediaRecorder.ondataavailable = function() {/** data avail */};
mediaRecorder.start(10); // collect 10ms of data
console.log('MediaRecorder started', mediaRecorder);
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.