cameraTuning property
Android: ask the camera for what Agora asks it for. Where the camera offers them, its high-quality noise reduction and exposure metered on the face are requested. A camera where that costs frame rate is found out in its first seconds and put back on the fast setting.
Off by default: what a camera does with the request is up to its maker, and on the two phones it was measured on the picture did not change. Set it before the engine is initialized, or change it during a call and then call applyCameraTuning.
Implementation
static bool cameraTuning = false;