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Re: [mediacapture-main] Implementers must not refuse to open sources set as default at the machine: "DOMException: Could not start audio source" is not in the specification (#708)

From: guest271314 via GitHub <sysbot+gh@w3.org>
Date: Sun, 02 Aug 2020 17:11:04 +0000
To: public-webrtc-logs@w3.org
Message-ID: <issue_comment.created-667700128-1596388263-sysbot+gh@w3.org>
This bug leads back to the sequence of events described at https://github.com/w3c/mediacapture-main/issues/703#issuecomment-653822239, specifically, the order should be `enumerateDevices()` permissions granted or not => `getUserMedia()` if permissions are granted, instead of `getUserMedia()` permissions granted or not => `enumerateDevices()` if granted - to avoid having to execute `getUserMedia()` twice to select one device intended to be selected

```
navigator.mediaDevices.getUserMedia({audio: true})
.then(async stream => {
  const [track] = stream.getTracks();
  const devices = await navigator.mediaDevices.enumerateDevices();
  console.log(devices);
  const {deviceId} = devices.find(({kind, label}) => kind === "audiooutput");
  track.stop();
  return navigator.mediaDevices.getUserMedia({audio:{deviceId:{exact: deviceId}}});
})
.then(stream => {
  console.log(stream.getTracks()[0]);
  // do stuff
})
.catch(console.error);
```

where even then the same code cannot be run at both Chromium and Nighly 80 because Nighly lists `kind` of the device as `"audioinput"` and `label` as `"Monitor of Built-in Audio Analog Stereo"` where Chromium 86 lists `kind` as `audiooutput` and `label` as `"Default"`. 

Preferably the devices should be able to be selected before capture of the device is started.

There should be consistency here. 





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