Add a sourceStream field to the CameraStream class, meant to contain a
reference to the direct stream which produces actual image data for
streams of type CameraStream::Mapped.
The sourceStream of mapped streams will be used in later patches to make
sure for each Mapped stream at least one libcamera::Stream is queued to
the libcamera::Camera.
Signed-off-by: Hirokazu Honda <hiroh@chromium.org>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>