turn into an executable instead of a library
burns the python library to the ground though. but I'm just doing a web service now, so it would be simpler to just use that, and for live python has the implementation as well still
This commit is contained in:
devdesk
143
examples/live.rs
143
examples/live.rs
@@ -1,143 +0,0 @@
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use clap::Parser;
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use dotenv::dotenv;
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use std::io::Write;
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use thermaldecoder::{Header, HDR_SIZE};
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use v4l::video::Output;
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#[derive(Parser, Debug)]
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#[command(version, about, long_about = None)]
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struct Args {
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#[arg(short, long, default_value_t = false)]
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temperature: bool,
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#[arg(short, long, default_value = "/dev/video0")]
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device: String,
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#[arg(short, long)]
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red_cutoff: Option<f64>,
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}
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fn pixel_to_celcius(x: u16) -> u16 {
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let x: f64 = x.into();
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let x = x / 256.0;
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let t = (-1.665884e-08) * x.powf(4.)
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+ (1.347094e-05) * x.powf(3.)
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+ (-4.396264e-03) * x.powf(2.)
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+ (9.506939e-01) * x
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+ (-6.353247e+01);
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(t * 256.0) as u16
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}
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fn main() -> anyhow::Result<()> {
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let args = Args::parse();
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dotenv().ok();
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let device = match std::env::var("THERMALCAM_IFACE=enp1s0f0") {
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Ok(d) => {
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let device = pcap::Device::list()
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.expect("device list failed")
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.into_iter()
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.find(|x| x.name == d)
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.expect(&format!("could not find device {}", d));
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device
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}
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Err(_) => pcap::Device::lookup()
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.expect("device lookup failed")
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.expect("no device available"),
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};
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// get the default Device
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println!("Using device {}", device.name);
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let output = args.device;
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println!("Using output v4l2loopback device {}", output);
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const WIDTH: usize = 288;
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const HEIGHT: usize = 384;
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let greyscale = !args.temperature || args.red_cutoff.is_none();
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let fourcc_repr = if greyscale {
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[
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b'Y', // | 0b10000000
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b'1', b'6',
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b' ', // Note: not using b' ' | 0x80, (V4L2_PIX_FMT_Y16_BE)
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// because VID_S_FMT ioctl returns EINVAL, so just swap the bytes here
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]
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} else {
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// RGB32 is 4 bytes R, G, B, A
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[b'R', b'G', b'B', b'4']
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};
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let bytes_per_pixel = if greyscale { 2 } else { 4 };
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let fourcc = v4l::format::FourCC { repr: fourcc_repr };
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let mut out = v4l::Device::with_path(output)?;
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// To find the fourcc code, use v4l2-ctl --list-formats-out /dev/video0
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// (or read the source :)
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// flip axes
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let format = v4l::Format::new(HEIGHT as u32, WIDTH as u32, fourcc);
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Output::set_format(&out, &format)?;
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// Setup Capture
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let mut cap = pcap::Capture::from_device(device)
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.unwrap()
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.immediate_mode(true)
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.open()
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.unwrap();
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// get a packet and print its bytes
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const PACKET_LEN: usize = 6972;
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// input is grayscale 16 bits per pixel
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const FRAME_LEN: usize = WIDTH * HEIGHT * 2;
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let mut frame = [0u8; FRAME_LEN];
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let mut len = 0;
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let output_frame_len = WIDTH * HEIGHT * bytes_per_pixel;
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let mut swapped_vec = vec![0u8; output_frame_len];
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let swapped = &mut swapped_vec;
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while let Ok(p) = cap.next_packet() {
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let data = p.data;
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if data.len() != PACKET_LEN {
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continue;
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}
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let data = &data[0x2a..];
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let header = match Header::read(data) {
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Ok(header) => header,
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Err(_) => continue,
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};
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let data = &data[HDR_SIZE..];
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if (header.part == 0 && len > 0)
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// do not write out of bounds - would panic, instead just skip
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|| (data.len() + len > FRAME_LEN)
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{
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if len == FRAME_LEN {
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// swap the bytes, we are using LE, not BE, 16 bit grayscale
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// possibly limitation of current v4l2loopback or v4l rust wrapper or libv4l2
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for i in 0..FRAME_LEN / 2 {
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let x = i % WIDTH;
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let y = (i / WIDTH) % HEIGHT;
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let mut pixel = u16::from_be_bytes([frame[i * 2], frame[i * 2 + 1]]);
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if greyscale {
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if args.temperature {
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pixel = pixel_to_celcius(pixel);
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}
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let pixel_swapped = pixel.to_le_bytes();
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let out_i = ((HEIGHT - 1 - y) + (WIDTH - 1 - x) * HEIGHT) * 2;
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swapped[out_i..out_i + 2].copy_from_slice(&pixel_swapped);
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} else {
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pixel = pixel_to_celcius(pixel);
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let cutoff = args.red_cutoff.unwrap();
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let (r, g, b) = if pixel > (256.0 * cutoff) as u16 {
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let p = pixel - (256.0 * cutoff) as u16;
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let p = (p / 256).max(127);
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((128 + p) as u8, 0, 0)
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} else {
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let g = frame[i * 2];
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let b = frame[i * 2 + 1];
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(0, g, b)
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};
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let out_i = ((HEIGHT - 1 - y) + (WIDTH - 1 - x) * HEIGHT) * 4;
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swapped[out_i..out_i + 4].copy_from_slice(&[0, r, g, b]);
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}
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}
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out.write_all(&swapped[..])?;
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}
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len = 0;
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}
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frame[len..len + data.len()].copy_from_slice(data);
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len += data.len();
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}
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Ok(())
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}
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