From b45450f65a45179f678e8c0db73767cbdb961ac8 Mon Sep 17 00:00:00 2001
From: mehbark <terezi@pyrope.net>
Date: Thu, 21 Nov 2024 15:03:41 -0500
Subject: [PATCH] initial

---
 Cargo.lock  | 1260 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |    9 +
 src/main.rs |  113 +++++
 3 files changed, 1382 insertions(+)
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..43664a8
--- /dev/null
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..11b484b
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "bad-apple"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+clap = { version = "4.5.20", features = ["derive"] }
+image = "0.25.5"
+tempfile = "3.13.0"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..f1c29cd
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,113 @@
+use std::{
+    fs::{self, File},
+    io::{self, BufWriter, Write},
+    path::{Path, PathBuf},
+    process::Command,
+    thread,
+    time::{self, Duration, Instant},
+};
+
+use clap::Parser;
+use image::{GenericImageView, ImageReader};
+
+const BAD_APPLE_PATH: &str = "../../bad-apple.webm";
+
+#[derive(Debug, Parser)]
+#[command(version, about, long_about = None)]
+struct Args {
+    #[arg(index = 1)]
+    height: u32,
+    #[arg(short, long, default_value = BAD_APPLE_PATH)]
+    path: String,
+}
+
+fn main() -> io::Result<()> {
+    let Args { height, path } = Args::parse();
+    let width = 4 * height / 3;
+
+    // cleaned up when dropped, which is good, but think!
+    let work_dir = tempfile::tempdir()?;
+
+    let frame_paths = get_frames(File::open(&path)?, &work_dir)?;
+    let frame_rate = get_framerate(File::open(path)?)?;
+    let time_per_frame = Duration::from_micros((1e6 / frame_rate) as u64);
+
+    let first_frame = ImageReader::open(&frame_paths[0])?.decode().unwrap();
+    let real_width = first_frame.width();
+    let real_height = first_frame.height();
+
+    let max_pixel_bytes = b"\x1b[48;2;255;255;255m  ".len();
+    let max_row_bytes = max_pixel_bytes * (width as usize) + b"\n".len();
+    let mut writer = BufWriter::with_capacity(max_row_bytes * (height as usize), io::stdout());
+
+    let mut start_time = Instant::now();
+    write!(writer, "\x1b[2J")?;
+    for path in frame_paths {
+        let image = ImageReader::open(path)?.decode().unwrap();
+        for row in 0..height {
+            for col in 0..width {
+                let col = col * real_width / width;
+                let row = row * real_height / height;
+                let image::Rgba([r, g, b, _]) = image.get_pixel(col, row);
+                write!(writer, "\x1b[48;2;{r};{g};{b}m  ")?;
+            }
+            writeln!(writer)?;
+        }
+        let end_time = Instant::now();
+        let late = end_time.duration_since(start_time) > time_per_frame;
+        writer.flush()?;
+        println!("\x1b[K\x1b[0m{:?}", end_time.duration_since(start_time));
+        println!("\x1b[H");
+        thread::sleep(time_per_frame.saturating_sub(end_time.duration_since(start_time)));
+        start_time = end_time;
+    }
+
+    Ok(())
+}
+
+fn get_framerate(video: File) -> io::Result<f32> {
+    // ffprobe -v 0 -of csv=p=0 -select_streams v:0 -show_entries stream=r_frame_rate infile
+    let output = Command::new("ffprobe")
+        .args([
+            "-v",
+            "0",
+            "-of",
+            "csv=p=0",
+            "-select_streams",
+            "v:0",
+            "-show_entries",
+            "stream=r_frame_rate",
+            "-",
+        ])
+        .stdin(video)
+        .output()?
+        .stdout;
+    let output = String::from_utf8_lossy(&output);
+    let (num, dem) = output
+        .trim()
+        .split_once('/')
+        .expect("ffprobe returns num/dem");
+    println!("{num} {dem}");
+
+    let num: f32 = num.parse().expect("ffprobe numerator is number");
+    let dem: f32 = dem.parse().expect("ffprobe denonimator is number");
+
+    Ok(num / dem)
+}
+
+fn get_frames(video: File, work_path: impl AsRef<Path>) -> io::Result<Vec<PathBuf>> {
+    // ffmpeg -r 1 -i file.mp4 -r 1 "$filename%03d.png
+    let mut cmd = Command::new("ffmpeg")
+        .args(["-r", "1", "-i", "pipe:", "-r", "1", "%04d.png"])
+        .stdin(video)
+        .current_dir(&work_path)
+        .spawn()?;
+
+    let exit_code = cmd.wait()?;
+    assert!(exit_code.success(), "bad exit code {exit_code}");
+
+    let dir = fs::read_dir(work_path)?;
+    let mut paths: Vec<PathBuf> = dir.flatten().map(|f| f.path()).collect();
+    paths.sort_by_cached_key(|f| f.display().to_string());
+    Ok(paths)
+}