There can now only be one CameraSource running.
Video frames are decoded in their own thread, and then converted by users in the user's threads.
The CameraSource API is entirely thread-safe and controls the video decoding thread.
The video device only stays open as long as there are users subscribed to the CameraSource.
We use a dangerous combination of spinlocks and memory fences to keep things synchronized.
The qTox Project is not associated with the Tox Project in any way, with the
exception of "qTox" using the Tox Projet's "toxcore" collection of libraries.
In particular, the Tox Projet does not own copyright over the qTox Project's
"qTox" collection of software, source code, and assets.
The qTox Project's assets are under the sole copyright of the qTox
contributors, and no partiular rights are granted to the Tox Project.
They were suffering from double-connection syndrom, and the way muting worked was now conflicting with how the output sound level setting works
Fixes#1442
Load the setting's cameria preview opengl context lazily and destroy it when done. Only preallocte Core's video buffer if we have any calls active, free up when all calls are done
Toxcore would incorrectly report the call as a video call in the call settings, and then crash while trying to send a video frame in the audio call. We workaround that by using another API that correctly reports the type of the call
