1330653 - Headphone plug / unplug events are not registered for mediaDevice.ondevicechanges

Status: RESOLVED INVALID

(Core :: WebRTC: Audio/Video, defect, P3)

Description

[Alexandru Simonca [:asimonca], Release Desktop QA]

[Note]:
-

[Affected versions]:
- 52.0a2 (id: 20170112004017)
- 53.0a1 (id: 20170112030301)

[Affected platforms]:
- Mac OS X 10.12.3

[Steps to reproduce]:
1. Go to https://jsfiddle.net/jib1/Lqo4paed/
2. Press "gUM!" and "Share the selected device" on the doorhanger.
3. Press "Enumerate!". 3 devices are found: webcam videoinput (FaceTime HD Camera, External Microphone (virtual OS webcam mic), External Microphone (built-in)
4. Disconnect the headphones. 

[Expected result]:
- A "device change!" message should appear informing the user that there was a change in the "audioinput".

[Actual result]:
- No "device change!" message appears even though a change is made.

3 devices.
videoinput: FaceTime HD Camera (Built-in) id=5uOdkFknPSl1T/L9/e1xMq5+qj0whxsYLFMYIklhUvQ= group=
audioinput: default: External Microphone id=VdwzR+7EJ+w1W7YRP/JQ//qKXQ6SMumWwGb7YCWzmSY= group=
audioinput: External Microphone id=SPYrQvEYkN07Al6A3f8gl7j2n8kVOCpHGNBD++SOT/4= group=
3 devices.
videoinput: FaceTime HD Camera (Built-in) id=5uOdkFknPSl1T/L9/e1xMq5+qj0whxsYLFMYIklhUvQ= group=
audioinput: default: Internal Microphone id=xGOA9EzdsCXz5k8SFROfnWfnl20U6SGSzOsextpTLUg= group=
audioinput: Internal Microphone id=pvfG0Dj+ao1AHg52wgzVkIDPzQhjh6aRvira8lPLkEY= group=

[Regression range]:
- This is not a regression.

[Additional notes]:
- This was tested on a iMac machine using it's built-in FaceTime HD Camera, it's built-in microphone and a pair of Plantronics headset headphones with a microphone.

Comment 1

[Munro Mengjue Chiang [:mchiang] Be Mozillian since 1/19/2018]

May I know the model ID of the headphone?
Does it use a 3.5mm headphone jack or usb connector?

Comment 2

[Alexandru Simonca [:asimonca], Release Desktop QA]

I used a "Plantronics Audio 355" headset with 3,5mm headphone jack.

Comment 3

[Alexandru Simonca [:asimonca], Release Desktop QA]

I have tested this some more and it seems that this issue happens on all platforms. The only way I got a "device change!" message using a headset / external microphone with a jack was using Windows 10 x64 with DTS Audio Control Panel installed, which prompted me to choose what type of input I was inserting in the microphone jack.

Comment 4

[Randell Jesup [:jesup] (needinfo me)]

some (many? most?) systems may not know what type of device is inserted in a 3.5 jack, just that one was.

Comment 5

[Munro Mengjue Chiang [:mchiang] Be Mozillian since 1/19/2018]

Most platform cannot detect 3.5mm jack. It's hardware & platform limitation.

Comment 6

[Jan-Ivar Bruaroey [:jib] (needinfo? me)]

Specifically, on OSX, headset hotswapping is a feature of the built-in device, so the number of devices do not change (only the name of the built-in device changes).