Function window_frames 

fn window_frames(codec: Codec, dpb: u32, anchored: bool) -> u32

The frames a reference window holds for a decoded picture buffer of dpb: an H.265 session keeping anchors still reaches, on Pascal’s NVENC, the frame the next frame’s reference picture set lets go, one past the buffer it declares. Turing’s, Ampere’s and Ada’s do not, and predict from the anchor before that frame where the window names it: a dependency the window states no older than the real one, so a client holding the frame named holds the one used.