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|
use crate::{
block::{AdvancedReference, Block},
frame::Frame,
helpers::{pixel::Pixel, threading::both_par, vector::Vec2},
refsampler::Sampler,
view::View,
};
use clap::ValueEnum;
use log::debug;
#[derive(Debug, Clone)]
pub struct EncodeConfig {
pub mode: EncodeMode,
pub ref_thres: f64,
pub max_diff_area: isize,
pub min_block_size: isize,
pub max_threads: usize,
}
#[derive(Debug, Clone, ValueEnum)]
pub enum EncodeMode {
Trivial,
Default,
Advanced,
}
pub fn encode_block(view: View<&Frame>, prev: View<&Frame>, config: &EncodeConfig) -> Block {
let (diff, refblock) = if view.area() > config.max_diff_area {
(
f64::INFINITY,
Block::Reference {
translation: Vec2::<isize>::ZERO,
},
)
} else {
match config.mode {
EncodeMode::Trivial => (
View::diff(&view, &prev) / view.area() as f64,
Block::Reference {
translation: Vec2::<isize>::ZERO,
},
),
EncodeMode::Default => {
let mut best_diff = f64::INFINITY;
let mut best_translation = Vec2::<isize>::ZERO;
const OFFSETS: &[isize] =
&[-64, -32, -16, -8, -4, -2, -1, 0, 1, 2, 4, 8, 16, 32, 64];
for x in OFFSETS {
for y in OFFSETS {
let translation = Vec2 { x: *x, y: *y };
let diff = View::diff(&view, &prev.offset(translation));
if diff < best_diff {
best_translation = translation;
best_diff = diff;
}
}
}
(
best_diff,
Block::Reference {
translation: best_translation,
},
)
}
EncodeMode::Advanced => {
let mut params = AdvancedReference::default();
let sampler = Sampler::from_refblock(prev.clone(), ¶ms);
let mut diff = View::diff_sampler(&view, &sampler);
loop {
pub fn pk<F: FnMut(&mut AdvancedReference) -> ()>(
view: &View<&Frame>,
prev: &View<&Frame>,
diff: &mut f64,
params: &mut AdvancedReference,
mut f: F,
) {
let mut p = params.clone();
f(&mut p);
let d = View::diff_sampler(view, &Sampler::from_refblock(prev.clone(), &p));
if d < *diff {
*diff = d;
*params = p;
}
}
let (mut d, mut p) = (diff, params.clone());
pk(&view, &prev, &mut d, &mut p, |p| p.translation.x += 4);
pk(&view, &prev, &mut d, &mut p, |p| p.translation.x -= 4);
pk(&view, &prev, &mut d, &mut p, |p| p.translation.y += 4);
pk(&view, &prev, &mut d, &mut p, |p| p.translation.y -= 4);
pk(&view, &prev, &mut d, &mut p, |p| p.translation.x += 2);
pk(&view, &prev, &mut d, &mut p, |p| p.translation.x -= 2);
pk(&view, &prev, &mut d, &mut p, |p| p.translation.y += 2);
pk(&view, &prev, &mut d, &mut p, |p| p.translation.y -= 2);
pk(&view, &prev, &mut d, &mut p, |p| p.translation.x += 1);
pk(&view, &prev, &mut d, &mut p, |p| p.translation.x -= 1);
pk(&view, &prev, &mut d, &mut p, |p| p.translation.y += 1);
pk(&view, &prev, &mut d, &mut p, |p| p.translation.y -= 1);
pk(&view, &prev, &mut d, &mut p, |p| p.value_scale += 1);
pk(&view, &prev, &mut d, &mut p, |p| p.value_scale -= 1);
pk(&view, &prev, &mut d, &mut p, |p| p.transform.a -= 1);
pk(&view, &prev, &mut d, &mut p, |p| p.transform.a += 1);
pk(&view, &prev, &mut d, &mut p, |p| p.transform.b -= 1);
pk(&view, &prev, &mut d, &mut p, |p| p.transform.b += 1);
pk(&view, &prev, &mut d, &mut p, |p| p.transform.c -= 1);
pk(&view, &prev, &mut d, &mut p, |p| p.transform.c += 1);
pk(&view, &prev, &mut d, &mut p, |p| p.transform.d -= 1);
pk(&view, &prev, &mut d, &mut p, |p| p.transform.d += 1);
debug!("{diff} -> {d}");
if d >= diff {
break (diff, Block::AdvancedReference(params));
}
diff = d;
params = p;
}
}
}
};
if diff < config.ref_thres {
refblock
} else {
if view.size.x < config.min_block_size || view.size.y < config.min_block_size {
Block::Literal(view.pixels())
} else {
let [av, bv] =
unsafe { std::mem::transmute::<_, [View<&'static Frame>; 2]>(view.split()) };
let [ap, bp] =
unsafe { std::mem::transmute::<_, [View<&'static Frame>; 2]>(prev.split()) };
let config = unsafe { std::mem::transmute::<_, &'static EncodeConfig>(config) };
// only bother to do multithreading, when the block is big.
let (a, b) = if view.size.x > 64 {
both_par(
|| encode_block(av, ap, config),
|| encode_block(bv, bp, config),
config.max_threads,
)
} else {
(encode_block(av, ap, config), encode_block(bv, bp, config))
};
if a.is_literal() && b.is_literal() {
Block::Literal(view.pixels())
} else {
Block::Split(Box::new([a, b]))
}
}
}
}
pub fn importance(view: &View<&Frame>) -> f64 {
let mut acc = 0;
for x in 0..view.size.x {
for y in 0..view.size.y {
let p = Vec2 { x, y };
if x > 0 {
acc += Pixel::distance(view[p], view[p + Vec2::<isize>::LEFT]);
}
if y > 0 {
acc += Pixel::distance(view[p], view[p + Vec2::<isize>::UP]);
}
}
}
(acc / view.area() as usize) as f64
}
|
