const SLICES: u32 = 4;Expand description
The slices an H.264 or HEVC picture is cut into, a decoder threading a frame across them.
AMD’s VCE is the exception for H.264: it codes a picture cut into four slices at less than
half its one-slice rate (Radeon Pro VII, 2160p: 44.6 against 20.4 ms a frame, 1080p: 8.7
against 5.7), where its HEVC and every other engine measured here cost nothing for them.
The low-power H.264 of Skylake and Broxton is the other (whole_picture_vdenc), one slice
where a session takes it, which it does only where the driver offers no full entry point.