bframes_signals/
bframes_signals.rs

1//! bframes-v2 gate fit harness: per-clip gate signals next to the measured
2//! B-frame BD truth (fixed3-vs-0 sign). Fit on the 12-clip table; the unused
3//! corpus clips are the HOLDOUTS (holdout-both-sides law).
4//!
5//!   cargo run --release -p rusty_h264-encoder --example bframes_signals -- <clip.y4m> [frames]
6
7use rusty_h264_encoder::EncoderConfig;
8
9fn read_y4m(path: &str, max_frames: usize) -> (usize, usize, Vec<rusty_h264_common::types::YuvFrame>) {
10    let raw = std::fs::read(path).unwrap_or_else(|e| panic!("read {path}: {e}"));
11    let hdr_end = raw.iter().position(|&b| b == b'\n').expect("y4m header");
12    let hdr = std::str::from_utf8(&raw[..hdr_end]).expect("utf8 header");
13    let (mut w, mut h) = (0usize, 0usize);
14    for tok in hdr.split_whitespace() {
15        match tok.as_bytes().first() {
16            Some(b'W') => w = tok[1..].parse().expect("width"),
17            Some(b'H') => h = tok[1..].parse().expect("height"),
18            _ => {}
19        }
20    }
21    let (ys, cs) = (w * h, (w / 2) * (h / 2));
22    let mut frames = Vec::new();
23    let mut p = hdr_end + 1;
24    while frames.len() < max_frames {
25        let Some(rel) = raw[p..].iter().position(|&b| b == b'\n') else { break };
26        p += rel + 1;
27        if p + ys + 2 * cs > raw.len() {
28            break;
29        }
30        frames.push(rusty_h264_common::types::YuvFrame {
31            width: w,
32            height: h,
33            y: raw[p..p + ys].to_vec(),
34            u: raw[p + ys..p + ys + cs].to_vec(),
35            v: raw[p + ys + cs..p + ys + 2 * cs].to_vec(),
36        });
37        p += ys + 2 * cs;
38    }
39    (w, h, frames)
40}
41
42fn main() {
43    let mut args = std::env::args().skip(1);
44    let path = args.next().expect("clip");
45    let nframes: usize = args.next().and_then(|s| s.parse().ok()).unwrap_or(30);
46    let (w, h, frames) = read_y4m(&path, nframes);
47    let name = std::path::Path::new(&path).file_stem().unwrap().to_string_lossy().to_string();
48    let cfg = EncoderConfig::new(w, h);
49    let (bi, gmc, mg, dc, screen, grain) = rusty_h264_encoder::bframes_gate_signals(&cfg, &frames);
50    println!(
51        "{name:<24} bi={bi:>7.3} gmc={gmc:>8.3} mgain={mg:.3} dcfrac={dc:.3} screen={} grain={}",
52        screen as u8, grain as u8
53    );
54}
bframes_signals/bframes_signals.rs

bframes_signals/
bframes_signals.rs
