onFrame

This method is called from native library via JNI on the same thread as UVCCamera#startCapture.You can use both UVCCamera#startCapture and #setFrameCallbackbut it is better to use either for better performance.You can also pass pixel format type to UVCCamera#setFrameCallback for this method.Some frames may drops if this method takes a time.When you use some color format like NV21, this library never execute color space conversion,just execute pixel format conversion. If you want to get same result as on screen, please try toconsider to get images via texture(SurfaceTexture) and read pixel buffer from it using OpenGL|ES2/3instead of using IFrameCallback(this way is much efficient in most case than using IFrameCallback).

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