我正在尝试创建一个Chrome扩展程序，该扩展程序可以捕获 Activity 选项卡中的音频，然后将其发送到另一台服务器，或者使其可以通过URL进行访问。
我正在使用 chrome.tabCapture.capture API并可以成功获取选项卡音频的MediaStream，但是在此之后我不知道该怎么办。
Chrome文档与MediaStreams无关，因此我浏览了一些文档here并与JS调试器一起使用，以查看可用的方法，但找不到将MediaStream发送到某处的方法。
最佳答案
现在可以使用MediaRecorder在JS中本地记录流。有一个演示here，而w3c规范是here
演示中的startRecording方法要求将window.stream设置为MediaStream实例。
// 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);
}