[iOS] when do we start/stop actually using the camera?

[terrychen1122]

Since iOS14, Apple will display an indicator on the status bar for camera usage. I am curious which of the following steps we start using the camera (to make sure we do the right thing at the right timing and step):

1. When ACSDeviceManager is created by ACSCallClient
2. When a ACSLocalVideoStream is initialized by a video device info from the device manager
3. When a ACSRenderer is initialized by a local video stream
4. When a ACSRendererView is initialized by a ACSRenderer that is created by a local video stream

My guess is #2 since I saw exception if I didn't grant permission when doing 2 (but it could also be 3 or 4). Since I don't have Xcode 12 installed locally, it will take some time for us to verify. So, I would just ask here to confirm.

Thanks

[xixian73]

#2 throws exception because we can't read camera settings without it.

#4 is when the camera is actually opened and iOS will start showing the indicator in status bar for camera usage and it will stay like that unless the app invokes ACSRenderer.dispose()