折腾：

期间，用相关代码：    function testMediaRecorder(mediaStream){

console.log("testMediaRecorder: mediaStream=%o", mediaStream);

const options = {mimeType: 'audio/webm'};

if (MediaRecorder.isTypeSupported(options.mimeType)) {

console.log("support options=%o", options);

} else {

console.log(options.mimeType + ' is not Supported');

}

const recordedChunks = [];

const mediaRecorder = new MediaRecorder(mediaStream, options);

console.log("mediaRecorder=%o", mediaRecorder);

mediaRecorder.addEventListener('dataavailable', function(e) {

console.log("dataavailable: e.data.size=%d, e.data=%o", e.data.size, e.data);

if (e.data.size > 0) {

recordedChunks.push(e.data);

console.log("recordedChunks=%o", recordedChunks);

}

if (shouldStop === true && stopped === false) {

mediaRecorder.stop();

stopped = true;

console.log("stopped=%s", stopped);

}

});

mediaRecorder.addEventListener('stop', function() {

// downloadLink.href = URL.createObjectURL(new Blob(recordedChunks));

// downloadLink.download = 'acetest.wav';

var blobFile = URL.createObjectURL(new Blob(recordedChunks));

console.log("blobFile=%o", blobFile);

$("#downloadSpeakAudio").attr("href", speakAudioFilename);

var curDate = new Date();

console.log("curDate=%o", curDate);

var curDatetimeStr = curDate.Format("yyyyMMdd_HHmmss");

console.log("curDatetimeStr=%o", curDatetimeStr);

var speakAudioFilename = curDatetimeStr + ".wav"

console.log("speakAudioFilename=%o", speakAudioFilename);

$("#downloadSpeakAudio").attr("download", speakAudioFilename);

});

console.log("before start: mediaRecorder.state=%s", mediaRecorder.state);

mediaRecorder.start();

// mediaRecorder.start(100);

console.log("after  start: mediaRecorder.state=%s", mediaRecorder.state);

}

但是始终无法执行到：dataavailable

从而无法得到麦克风录音的数据

MediaRecorder dataavailable not work

chrome中是可以开启摄像头的：

Chrome’s experimental Web Platform Features enabled

MediaRecorder voice

js MediaRecorder voice

去调试：console.log("before start: mediaRecorder.state=%s", mediaRecorder.state);

mediaRecorder.start();

console.log("after start: mediaRecorder.state=%s", mediaRecorder.state);

state是对的：before start: mediaRecorder.state=inactive

main.js:196 after  start: mediaRecorder.state=recording

MediaRecorder dataavailable not fire

“2.2. Attributes

stream, of type MediaStream, readonly

The MediaStream to be recorded.

mimeType, of type DOMString, readonly

The MIME type [RFC2046] that has been selected as the container for recording. This entry includes all the parameters to the base mimeType. The UA should be able to play back any of the MIME types it supports for recording. For example, it should be able to display a video recording in the HTML tag. The default value for this property is platform-specific.

mimeType specifies the media type and container format for the recording via a type/subtype combination, with the codecs and/or profiles parameters [RFC6381] specified where ambiguity might arise. Individual codecs might have further optional specific parameters.

state, of type RecordingState, readonly

The current state of the MediaRecorder object. When the MediaRecorder is created, the UA MUST set this attribute to i