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|
use crate::BLOCK_SIZE;
use framework::BitstreamFilter;
use glam::{IVec2, ivec2};
pub struct Enc {
res: IVec2,
last: Frame,
}
impl BitstreamFilter for Enc {
const INPUT_CODEC_ID: &str = "V_UNCOMPRESSED";
const OUTPUT_CODEC_ID: &str = "V_VCETEST2";
fn new(width: u32, height: u32) -> Self {
let res = ivec2(width as i32, height as i32);
Self {
res,
last: Frame::new(res),
}
}
fn process_block(&mut self, a: Vec<u8>) -> Vec<u8> {
let mut frame = Frame {
data: a,
res: self.res,
};
for by in 0..frame.res.y / BLOCK_SIZE {
for bx in 0..frame.res.x / BLOCK_SIZE {
let boff = ivec2(bx * BLOCK_SIZE, by * BLOCK_SIZE);
let mut best_d = Frame::compare_block(&frame, &self.last, boff, boff);
let mut best_off = ivec2(0, 0);
for granularity in [8, 4, 2, 1] {
for dir in [
ivec2(1, 0),
ivec2(1, 1),
ivec2(0, 1),
ivec2(-1, 1),
ivec2(-1, 0),
ivec2(-1, -1),
ivec2(0, -1),
ivec2(1, -1),
] {
let roff = boff + dir * granularity;
if roff.x >= 0
&& roff.y >= 0
&& roff.x + BLOCK_SIZE < frame.res.x
&& roff.y + BLOCK_SIZE < frame.res.y
{
let d = Frame::compare_block(&frame, &self.last, boff, roff);
if d < best_d {
best_d = d;
best_off = roff;
}
}
}
}
if best_d < 8 * 8 * 20 {
Frame::copy_block(&self.last, &mut frame, best_off, boff);
}
}
}
self.last = frame.clone();
frame.data
}
}
#[derive(Clone)]
struct Frame {
res: IVec2,
data: Vec<u8>,
}
impl Frame {
fn new(res: IVec2) -> Self {
Frame {
res,
data: vec![127; (res.x * res.y + res.x * res.y / 2) as usize],
}
}
fn copy_block(aframe: &Frame, bframe: &mut Frame, aoff: IVec2, boff: IVec2) {
assert_eq!(aframe.res, bframe.res);
let res = aframe.res;
// Luma
for y in 0..BLOCK_SIZE {
let ay_off = aoff.x + (y + aoff.y) * res.x;
let by_off = boff.x + (y + boff.y) * res.x;
bframe.data[by_off as usize..(by_off + BLOCK_SIZE) as usize]
.copy_from_slice(&aframe.data[ay_off as usize..(ay_off + BLOCK_SIZE) as usize]);
}
// Chroma
let uvplane_off = res.x * res.y;
for y in 0..BLOCK_SIZE / 2 {
let ay_off = uvplane_off + (aoff.x & !1) + (y + aoff.y / 2) * res.x;
let by_off = uvplane_off + (boff.x & !1) + (y + boff.y / 2) * res.x;
bframe.data[by_off as usize..(by_off + BLOCK_SIZE) as usize]
.copy_from_slice(&aframe.data[ay_off as usize..(ay_off + BLOCK_SIZE) as usize]);
}
}
fn compare_block(aframe: &Frame, bframe: &Frame, aoff: IVec2, boff: IVec2) -> u32 {
assert_eq!(aframe.res, bframe.res);
let res = aframe.res;
let mut diff = 0;
// Luma
for y in 0..BLOCK_SIZE {
let ay_off = aoff.x + (y + aoff.y) * res.x;
let by_off = boff.x + (y + boff.y) * res.x;
for x in 0..BLOCK_SIZE {
diff += aframe.data[(ay_off + x) as usize]
.abs_diff(bframe.data[(by_off + x) as usize]) as u32
}
}
// Chroma
let uvplane_off = res.x * res.y;
for y in 0..BLOCK_SIZE / 2 {
let ay_off = uvplane_off + (aoff.x & !1) + (y + aoff.y / 2) * res.x;
let by_off = uvplane_off + (boff.x & !1) + (y + boff.y / 2) * res.x;
for x in 0..BLOCK_SIZE {
diff += aframe.data[(ay_off + x) as usize]
.abs_diff(bframe.data[(by_off + x) as usize]) as u32;
}
}
diff
}
}
|
