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-rw-r--r--evc/src/codec/compress.rs151
-rw-r--r--evc/src/codec/decode.rs6
-rw-r--r--evc/src/codec/encode/mod.rs29
-rw-r--r--evc/src/codec/mod.rs1
4 files changed, 173 insertions, 14 deletions
diff --git a/evc/src/codec/compress.rs b/evc/src/codec/compress.rs
new file mode 100644
index 0000000..e011669
--- /dev/null
+++ b/evc/src/codec/compress.rs
@@ -0,0 +1,151 @@
+use crate::{
+ block::Block,
+ frame::Frame,
+ helpers::{pixel::Pixel, vector::Vec2},
+ view::View,
+};
+use rustdct::DctPlanner;
+
+pub fn compress_block(block: &mut Block, size: Vec2<usize>) {
+ match block {
+ Block::Literal(p) => {
+ let comp = lit_compress(size.x, size.y, &p);
+ *block = Block::CompressedLiteral(comp)
+ }
+ Block::Split(box [a, b]) => {
+ let vert = size.x > size.y;
+ compress_block(
+ a,
+ if vert {
+ Vec2 {
+ x: size.x / 2,
+ y: size.y,
+ }
+ } else {
+ Vec2 {
+ x: size.x,
+ y: size.y / 2,
+ }
+ },
+ );
+ compress_block(
+ b,
+ if vert {
+ Vec2 {
+ x: size.x - size.x / 2,
+ y: size.y,
+ }
+ } else {
+ Vec2 {
+ x: size.x,
+ y: size.y - size.y / 2,
+ }
+ },
+ );
+ }
+ _ => (),
+ }
+}
+
+pub fn lit_compress(w: usize, h: usize, pixels: &[Pixel]) -> Vec<u8> {
+ let mut out = vec![];
+ for ci in 0..3 {
+ let mut ch = vec![0.; w * h];
+ for y in 0..h {
+ for x in 0..w {
+ let p = pixels[x + y * w];
+ ch[x + y * w] = match ci {
+ 0 => p.r,
+ 1 => p.g,
+ 2 => p.b,
+ _ => unreachable!(),
+ } as f32
+ }
+ }
+
+ norm_dct_channel(w, h, &mut ch);
+ for i in 0..w * h {
+ out.push(ch[i] as u8)
+ }
+ }
+ out
+}
+pub fn lit_decompress(compressed: &[u8], mut target: View<&mut Frame>) {
+ let (w, h) = (target.size.x as usize, target.size.y as usize);
+ for ci in 0..3 {
+ let mut ch = compressed[ci * w * h..(ci + 1) * w * h]
+ .iter()
+ .map(|v| *v as f32)
+ .collect::<Vec<_>>();
+ norm_idct_channel(w, h, &mut ch);
+ for y in 0..h {
+ for x in 0..w {
+ let p = &mut target[Vec2 {
+ x: x as isize,
+ y: y as isize,
+ }];
+ *(match ci {
+ 0 => &mut p.r,
+ 1 => &mut p.g,
+ 2 => &mut p.b,
+ _ => unreachable!(),
+ }) = ch[x + y * w] as u8
+ }
+ }
+ }
+}
+
+fn norm_dct_channel(w: usize, h: usize, values: &mut [f32]) {
+ let d = DctPlanner::new().plan_dct2(w);
+ let mut temp = vec![0.; d.get_scratch_len()];
+ for c in values.chunks_exact_mut(w) {
+ d.process_dct2_with_scratch(c, &mut temp)
+ }
+
+ let mut values_trans = transpose(w, h, values);
+ let d = DctPlanner::new().plan_dct2(h);
+ let mut temp = vec![0.; d.get_scratch_len()];
+ for c in values_trans.chunks_exact_mut(h) {
+ d.process_dct2_with_scratch(c, &mut temp)
+ }
+
+ let scale = 2. / (w as f32 * h as f32).sqrt();
+ for (i, v) in values_trans.iter().enumerate() {
+ values[i] = *v * scale
+ }
+}
+
+fn norm_idct_channel(w: usize, h: usize, values: &mut [f32]) {
+ let d = DctPlanner::new().plan_dct2(w);
+ let mut temp = vec![0.; d.get_scratch_len()];
+ for c in values.chunks_exact_mut(w) {
+ d.process_dct3_with_scratch(c, &mut temp)
+ }
+
+ let mut values_trans = transpose(w, h, values);
+ let d = DctPlanner::new().plan_dct2(h);
+ let mut temp = vec![0.; d.get_scratch_len()];
+ for c in values_trans.chunks_exact_mut(h) {
+ d.process_dct3_with_scratch(c, &mut temp)
+ }
+
+ let scale = 2. / (w as f32 * h as f32).sqrt();
+ for (i, v) in values_trans.iter().enumerate() {
+ values[i] = *v * scale
+ }
+}
+
+fn transpose(w: usize, h: usize, values: &[f32]) -> Vec<f32> {
+ let mut i = 0;
+ let mut it;
+ let mut transposed = vec![0.; values.len()];
+ for row in 0..h {
+ it = row;
+ for _ in 0..w {
+ transposed[it] = values[i];
+ i += 1;
+ it += h;
+ }
+ }
+ transposed
+}
diff --git a/evc/src/codec/decode.rs b/evc/src/codec/decode.rs
index 61234da..087483c 100644
--- a/evc/src/codec/decode.rs
+++ b/evc/src/codec/decode.rs
@@ -2,6 +2,8 @@ use crate::{
block::Block, frame::Frame, helpers::threading::both_par, refsampler::Sampler, view::View,
};
+use super::compress::lit_decompress;
+
pub struct DecodeConfig {
pub max_threads: usize,
}
@@ -29,7 +31,9 @@ pub fn decode_block(
config.max_threads,
);
}
- Block::CompressedLiteral(_) => todo!(),
+ Block::CompressedLiteral(data) => {
+ lit_decompress(&data, target);
+ }
Block::Reference { translation } => target.copy_from(&prev.offset(*translation)),
Block::AdvancedReference(r) => target.copy_from_sampler(&Sampler::from_refblock(prev, r)),
}
diff --git a/evc/src/codec/encode/mod.rs b/evc/src/codec/encode/mod.rs
index 336f298..76fb481 100644
--- a/evc/src/codec/encode/mod.rs
+++ b/evc/src/codec/encode/mod.rs
@@ -30,7 +30,7 @@ pub enum EncodeMode {
AdvancedPartial,
}
-pub fn encode_block(view: View<&Frame>, prev: View<&Frame>, config: &EncodeConfig) -> Block {
+pub fn encode_block(view: View<&Frame>, prev: View<&Frame>, config: &EncodeConfig) -> (f64, Block) {
let (diff, refblock) = if view.area() > config.max_diff_area {
(
f64::INFINITY,
@@ -57,10 +57,10 @@ pub fn encode_block(view: View<&Frame>, prev: View<&Frame>, config: &EncodeConfi
(diff - irrelevance, refblock)
};
if diff < config.ref_thres {
- refblock
+ (diff, refblock)
} else {
if view.size.x < config.min_block_size || view.size.y < config.min_block_size {
- Block::Literal(view.pixels())
+ (0.0, Block::Literal(view.pixels()))
} else {
let [av, bv] =
unsafe { std::mem::transmute::<_, [View<&'static Frame>; 2]>(view.split()) };
@@ -69,7 +69,7 @@ pub fn encode_block(view: View<&Frame>, prev: View<&Frame>, config: &EncodeConfi
let config = unsafe { std::mem::transmute::<_, &'static EncodeConfig>(config) };
// only bother to do multithreading, when the block is big.
- let (a, b) = if view.area() > 100 {
+ let ((ad, a), (bd, b)) = if view.area() > 100 {
both_par(
|| encode_block(av, ap, config),
|| encode_block(bv, bp, config),
@@ -79,15 +79,18 @@ pub fn encode_block(view: View<&Frame>, prev: View<&Frame>, config: &EncodeConfi
(encode_block(av, ap, config), encode_block(bv, bp, config))
};
- if a.is_literal() && b.is_literal() {
- Block::Literal(view.pixels())
- } else if Block::identical_ref(&a, &b) {
- Block::Reference {
- translation: Vec2::<isize>::ZERO,
- }
- } else {
- Block::Split(Box::new([a, b]))
- }
+ (
+ ad + bd,
+ if a.is_literal() && b.is_literal() {
+ Block::Literal(view.pixels())
+ } else if Block::identical_ref(&a, &b) {
+ Block::Reference {
+ translation: Vec2::<isize>::ZERO,
+ }
+ } else {
+ Block::Split(Box::new([a, b]))
+ },
+ )
}
}
}
diff --git a/evc/src/codec/mod.rs b/evc/src/codec/mod.rs
index 1c80d24..3203e6e 100644
--- a/evc/src/codec/mod.rs
+++ b/evc/src/codec/mod.rs
@@ -1,2 +1,3 @@
pub mod decode;
pub mod encode;
+pub mod compress;
generated by cgit v1.2.3-70-g09d2 (git 2.51.0) at 2025-10-08 11:55:17 +0000