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rgb for cutoff temperature

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This commit is contained in:
devdesk 2024-02-19 22:26:25 +02:00
parent 0af76ed532
commit 2ba4528c1d
1 changed files with 33 additions and 17 deletions
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36
examples/live.rs
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@ -50,12 +50,19 @@ fn main() -> anyhow::Result<()> {
const WIDTH: usize = 288;
const HEIGHT: usize = 384;
let fourcc_repr = [
let greyscale = !args.temperature || args.red_cutoff.is_none();
let fourcc_repr = if greyscale {
[
b'Y', // | 0b10000000
b'1', b'6',
b' ', // Note: not using b' ' | 0x80, (V4L2_PIX_FMT_Y16_BE)
// because VID_S_FMT ioctl returns EINVAL, so just swap the bytes here
];
]
} else {
// RGB32 is 4 bytes R, G, B, A
[b'R', b'G', b'B', b'4']
};
let bytes_per_pixel = if greyscale { 2 } else { 4 };
let fourcc = v4l::format::FourCC { repr: fourcc_repr };
let mut out = v4l::Device::with_path(output)?;
// To find the fourcc code, use v4l2-ctl --list-formats-out /dev/video0
@ -72,9 +79,13 @@ fn main() -> anyhow::Result<()> {
// get a packet and print its bytes
const PACKET_LEN: usize = 6972;
// input is grayscale 16 bits per pixel
const FRAME_LEN: usize = WIDTH * HEIGHT * 2;
let mut frame = [0u8; FRAME_LEN];
let mut len = 0;
let output_frame_len = WIDTH * HEIGHT * bytes_per_pixel;
let mut swapped_vec = vec![0u8; output_frame_len];
let swapped = &mut swapped_vec;
while let Ok(p) = cap.next_packet() {
let data = p.data;
if data.len() != PACKET_LEN {
@ -93,21 +104,26 @@ fn main() -> anyhow::Result<()> {
if len == FRAME_LEN {
// swap the bytes, we are using LE, not BE, 16 bit grayscale
// possibly limitation of current v4l2loopback or v4l rust wrapper or libv4l2
let mut swapped = [0u8; FRAME_LEN];
for i in 0..FRAME_LEN / 2 {
let mut pixel = u16::from_be_bytes([frame[i * 2], frame[i * 2 + 1]]);
if greyscale {
if args.temperature {
pixel = pixel_to_celcius(pixel);
if let Some(cutoff) = args.red_cutoff {
pixel = if pixel > (256.0 * cutoff) as u16 {
50000
} else {
0
}
}
}
let pixel_swapped = pixel.to_le_bytes();
swapped[i * 2..i * 2 + 2].copy_from_slice(&pixel_swapped);
} else {
pixel = pixel_to_celcius(pixel);
let cutoff = args.red_cutoff.unwrap();
let r = if pixel > (256.0 * cutoff) as u16 {
255
} else {
0
};
let g = frame[i * 2];
let b = frame[i * 2 + 1];
swapped[i * 4..i * 4 + 4].copy_from_slice(&[0, r, g, b]);
}
}
out.write_all(&swapped[..])?;
}