| 1 | use nihav_codec_support::codecs::{MV, ZERO_MV}; |
| 2 | |
| 3 | pub fn pix_dist(a: u8, b: u8) -> u32 { |
| 4 | ((i32::from(a) - (i32::from(b))) * (i32::from(a) - (i32::from(b)))) as u32 |
| 5 | } |
| 6 | |
| 7 | pub fn calc_diff(src1: &[u8], stride1: usize, src2: &[u8], stride2: usize) -> u32 { |
| 8 | src1.chunks(stride1).zip(src2.chunks(stride2)).take(8).fold(0u32, |
| 9 | |acc, (line1, line2)| acc + line1[..8].iter().zip(line2.iter()).fold(0u32, |
| 10 | |acc2, (&a, &b)| acc2 + pix_dist(a, b))) |
| 11 | } |
| 12 | |
| 13 | const DIA_LARGE: [MV; 4] = [MV{x: 2, y: 0}, MV{x: 0, y: 2}, MV{x: -2, y: 0}, MV{x: 0, y: -2}]; |
| 14 | const DIA_SMALL: [MV; 4] = [MV{x: 1, y: 0}, MV{x: 0, y: 1}, MV{x: -1, y: 0}, MV{x: 0, y: -1}]; |
| 15 | fn check_mv(x: usize, y: usize, width: usize, height: usize, mv: MV) -> bool { |
| 16 | let xpos = (x as isize) + isize::from(mv.x); |
| 17 | let ypos = (y as isize) + isize::from(mv.y); |
| 18 | |
| 19 | mv.x.abs() <= 15 && mv.y.abs() <= 15 && |
| 20 | xpos >= 0 && (xpos + 8 <= (width as isize)) && |
| 21 | ypos >= 0 && (ypos + 8 <= (height as isize)) |
| 22 | } |
| 23 | |
| 24 | pub fn mv_search(src: &[u8], stride: usize, width: usize, height: usize, |
| 25 | x: usize, y: usize, skip_diff: u32, |
| 26 | ref_blk: &[u8; 64], tmp: &mut [u8; 64]) -> (MV, u32) { |
| 27 | let mut best_diff = skip_diff; |
| 28 | let mut best_mv = ZERO_MV; |
| 29 | loop { |
| 30 | let last_mv = best_mv; |
| 31 | for &off_mv in DIA_LARGE.iter() { |
| 32 | let mv = best_mv + off_mv; |
| 33 | if !check_mv(x, y, width, height, mv) { |
| 34 | continue; |
| 35 | } |
| 36 | get_block(src, stride, x, y, mv, tmp); |
| 37 | let diff = calc_diff(ref_blk, 8, tmp, 8); |
| 38 | if diff < best_diff { |
| 39 | best_diff = diff; |
| 40 | best_mv = mv; |
| 41 | } |
| 42 | } |
| 43 | if best_mv == last_mv { |
| 44 | break; |
| 45 | } |
| 46 | } |
| 47 | loop { |
| 48 | let last_mv = best_mv; |
| 49 | for &off_mv in DIA_SMALL.iter() { |
| 50 | let mv = best_mv + off_mv; |
| 51 | if !check_mv(x, y, width, height, mv) { |
| 52 | continue; |
| 53 | } |
| 54 | get_block(src, stride, x, y, mv, tmp); |
| 55 | let diff = calc_diff(ref_blk, 8, tmp, 8); |
| 56 | if diff < best_diff { |
| 57 | best_diff = diff; |
| 58 | best_mv = mv; |
| 59 | } |
| 60 | } |
| 61 | if best_mv == last_mv { |
| 62 | break; |
| 63 | } |
| 64 | } |
| 65 | (best_mv, best_diff) |
| 66 | } |
| 67 | |
| 68 | pub fn get_block(src: &[u8], stride: usize, x: usize, y: usize, mv: MV, dst: &mut [u8; 64]) { |
| 69 | let pos = (x as isize + isize::from(mv.x) + (y as isize + isize::from(mv.y)) * (stride as isize)) as usize; |
| 70 | for (dline, sline) in dst.chunks_exact_mut(8).zip(src[pos..].chunks(stride)) { |
| 71 | dline.copy_from_slice(&sline[..8]); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | pub fn put_block(dst: &mut [u8], dstride: usize, cur_blk: &[u8; 64]) { |
| 76 | for (dline, sline) in dst.chunks_mut(dstride).zip(cur_blk.chunks_exact(8)) { |
| 77 | dline[..8].copy_from_slice(sline); |
| 78 | } |
| 79 | } |