try to do temperature change, wrongly

thermalcamdecoder/src/main.rs

@@ -20,10 +20,10 @@ fn get_packets_without_udp_header() -> anyhow::Result<(Vec<Vec<u8>>, usize, usiz
                 i += 1;
                 size += offset;
                 match packet {
-                    PcapBlockOwned::Legacy(block) => {
+                    PcapBlockOwned::Legacy(_block) => {
                         println!("dunno");
                     }
-                    PcapBlockOwned::LegacyHeader(block) => {
+                    PcapBlockOwned::LegacyHeader(_block) => {
                         println!("dunnoheader");
                     }
                     PcapBlockOwned::NG(block) => {
@@ -89,6 +89,7 @@ impl Header {
         })
     }
 
+    #[allow(dead_code)]
     fn read_via_cast(data: &[u8]) -> anyhow::Result<&Self> {
         let size = std::mem::size_of::<Self>();
         if data.len() < size {
@@ -110,7 +111,7 @@ fn main() -> anyhow::Result<()> {
     let mut parts = vec![];
     for packet in data.iter() {
         if let Ok(ref mut dump) = dump {
-            dump.write_all(&packet);
+            dump.write_all(&packet)?;
         }
         let hdr = Header::read(packet)?;
         let data = packet[HDR_SIZE..].to_vec();
@@ -121,6 +122,7 @@ fn main() -> anyhow::Result<()> {
         parts.push(data);
     }
     println!("found {} frames", frames.len());
+    println!("writing raw pngs");
     let pb = ProgressBar::new(frames.len() as u64);
     for (i, frame) in frames.iter().enumerate().progress_with(pb) {
         let name = format!("{:03}.png", i);
@@ -131,7 +133,35 @@ fn main() -> anyhow::Result<()> {
         encoder.set_color(png::ColorType::Grayscale);
         encoder.set_depth(png::BitDepth::Sixteen);
         let mut writer = encoder.write_header()?;
-        writer.write_image_data(&frame);
+        writer.write_image_data(&frame)?;
+    }
+
+    println!("writing calibrated (value is temperature)");
+    let pb = ProgressBar::new(frames.len() as u64);
+    for (i, frame) in frames.iter().enumerate().progress_with(pb) {
+        let name = format!("temp_{:03}.png", i);
+        let path = Path::new(&name);
+        let file = File::create(path).unwrap();
+        let ref mut w = BufWriter::new(file);
+        let mut encoder = png::Encoder::new(w, 288, 384);
+        encoder.set_color(png::ColorType::Grayscale);
+        encoder.set_depth(png::BitDepth::Eight);
+        let mut writer = encoder.write_header()?;
+        let p = frame.as_ptr();
+        let samples: &[u16] = unsafe { std::slice::from_raw_parts(p.cast(), frame.len() / 2) };
+        let frame = samples
+            .iter()
+            .copied()
+            .map(|x| {
+                let x: f64 = x.into();
+                ((-1.665884e-08) * x.powf(4.)
+                    + (1.347094e-05) * x.powf(3.)
+                    + (-4.396264e-03) * x.powf(2.)
+                    + (9.506939e-01) * x
+                    + (-6.353247e+01)) as u8
+            })
+            .collect::<Vec<u8>>();
+        writer.write_image_data(&frame)?;
     }
 
     Ok(())