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.
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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.
The qTox Project is not associated with the Tox Project in any ways, 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.
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
