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|
use anyhow::Context;
use clap::Parser;
use evc::{
block::{Block, BlockInner},
frame::Frame,
header::Header,
ser::Sink,
view::View,
};
use std::io::{BufReader, BufWriter};
#[derive(Parser)]
#[clap(about, version)]
pub struct EncodeArgs {
#[arg(short = 'W', long)]
width: usize,
#[arg(short = 'H', long)]
height: usize,
}
fn main() -> anyhow::Result<()> {
let args = EncodeArgs::parse();
let mut input = BufReader::new(std::io::stdin());
let mut output = BufWriter::new(std::io::stdout());
let size = (args.width, args.height);
output
.put(Header {
resolution: size,
frame_count: 0,
})
.context("writing header")?;
let mut prev_frame = Frame::new(size);
for i in 0.. {
eprintln!("encode frame {i}");
let frame = Frame::read(&mut input, size)
.context("reading raw frame")
.unwrap();
let v1 = frame.view((0, 0), size);
let v2 = prev_frame.view((0, 0), size);
let root = encode_block(v1, v2);
root.write(&mut output).context("writing encoded frame")?;
prev_frame = frame;
}
Ok(())
}
fn encode_block(view: View<&Frame>, prev: View<&Frame>) -> Block {
let diff = View::diff(&view, &prev) / view.area() as f64;
// eprintln!("{:?} {diff}", view.size);
let inner = if diff < 0.9 {
BlockInner::Reference {
translation: (0, 0),
}
} else {
if view.size.0 < 32 {
BlockInner::Literal(view.pixels())
} else {
let [av, bv] = view.split();
let [ap, bp] = prev.split();
let a = encode_block(av, ap);
let b = encode_block(bv, bp);
if a.is_literal() && b.is_literal() {
BlockInner::Literal(view.pixels())
} else {
BlockInner::Split(Box::new([a, b]))
}
}
};
Block {
size: view.size,
inner,
}
}
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