// This function ensures that egress streams always send real world up
// streams.
// Note: There are two components of the camera rotation. The rotation of
// the capturer relative to the device. I.e. up for the camera might not be
// device up. When rotating the device the camera is also rotated.
// The former is called orientation and the second is called rotation here.
public virtual void compensateCameraRotation()
{
int cameraOrientation = cameraOrientations[(int)facingOf(usingFrontCamera)];
// The device orientation is the device's rotation relative to its
// natural position.
int cameraRotation = roundRotation(currentDeviceOrientation);
int totalCameraRotation = 0;
if (usingFrontCamera)
{
// The front camera rotates in the opposite direction of the
// device.
int inverseCameraRotation = (360 - cameraRotation) % 360;
totalCameraRotation = (inverseCameraRotation + cameraOrientation) % 360;
}
else
{
totalCameraRotation = (cameraRotation + cameraOrientation) % 360;
}
viEAndroidJavaAPI.SetRotation(cameraId, totalCameraRotation);
}