v4l by rust process, still sudo, endianess reversed

examples/live.rs

@@ -1,40 +1,7 @@
 use dotenv::dotenv;
-use std::fs::File;
 use std::io::Write;
-use thermaldecoder::{Frame, Header, HDR_SIZE};
-
-// fn main() -> Result<(), eframe::Error> {
-//     env_logger::init(); // Log to stderr (if you run with `RUST_LOG=debug`).
-//     let options = eframe::NativeOptions {
-//         viewport: egui::ViewportBuilder::default().with_inner_size([600.0, 800.0]),
-//         ..Default::default()
-//     };
-//     let (sender, receiver) = crossbeam::channel::unbounded();
-//     eframe::run_native(
-//         "Image Viewer",
-//         options,
-//         Box::new(|cc| {
-//             // This gives us image support:
-//             egui_extras::install_image_loaders(&cc.egui_ctx);
-//             Box::<MyApp>::default()
-//         }),
-//     )
-// }
-
-// #[derive(Default)]
-// struct MyApp {}
-
-// impl eframe::App for MyApp {
-//     fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
-//         egui::CentralPanel::default().show(ctx, |ui| {
-//             egui::ScrollArea::both().show(ui, |ui| {
-//                 ui.add(egui::Image::new().rounding(10.0));
-
-//                 ui.image(egui::include_image!("ferris.svg"));
-//             });
-//         });
-//     }
-// }
+use thermaldecoder::{Header, HDR_SIZE};
+use v4l::video::Output;
 
 fn main() -> anyhow::Result<()> {
     dotenv().ok();
@@ -57,7 +24,20 @@ fn main() -> anyhow::Result<()> {
     let output = std::env::args()
         .nth(1)
         .expect("required output file argument");
-    println!("Using output {}", output);
+    println!("Using output v4l2loopback device {}", output);
+
+    const WIDTH: usize = 288;
+    const HEIGHT: usize = 384;
+
+    let mut out = v4l::Device::with_path(output)?;
+    // To find the fourcc code, use v4l2-ctl --list-formats-out /dev/video0
+    // (or read the source :)
+    let format = v4l::Format::new(
+        WIDTH as u32,
+        HEIGHT as u32,
+        v4l::format::FourCC::new(b"Y16 "),
+    );
+    Output::set_format(&out, &format)?;
 
     // Setup Capture
     let mut cap = pcap::Capture::from_device(device)
@@ -68,13 +48,12 @@ fn main() -> anyhow::Result<()> {
 
     // get a packet and print its bytes
     const PACKET_LEN: usize = 6972;
-    const FRAME_LEN: usize = 288 * 384 * 2;
+    const FRAME_LEN: usize = WIDTH * HEIGHT * 2;
     let mut frame = [0u8; FRAME_LEN];
     let mut len = 0;
-    let mut out = File::create(&output)?;
     while let Ok(p) = cap.next_packet() {
         let data = p.data;
-        if data.len() != 6972 {
+        if data.len() != PACKET_LEN {
             continue;
         }
         let data = &data[0x2a..];