diff --git a/.gitignore b/.gitignore
index 3357967..6875498 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
 /venv
 /frames
 **/*.png
-thermaldecoder/target
+target
diff --git a/thermaldecoder/Cargo.lock b/Cargo.lock
similarity index 100%
rename from thermaldecoder/Cargo.lock
rename to Cargo.lock
diff --git a/thermaldecoder/Cargo.toml b/Cargo.toml
similarity index 93%
rename from thermaldecoder/Cargo.toml
rename to Cargo.toml
index 1a2d8ee..0650980 100644
--- a/thermaldecoder/Cargo.toml
+++ b/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2021"
 
 [lib]
 name = "thermaldecoder"
-crate-type = ["cdylib"]
+crate-type = ["rlib", "cdylib"]
 
 [dependencies]
 anyhow = "1.0.77"
diff --git a/examples/main.rs b/examples/main.rs
new file mode 100644
index 0000000..5df7887
--- /dev/null
+++ b/examples/main.rs
@@ -0,0 +1,11 @@
+use thermaldecoder::decode_raw;
+
+use std::env;
+
+fn main() -> anyhow::Result<()> {
+    let mut arg = env::args();
+    let filename = arg.next().ok_or(anyhow::anyhow!("unexpected"))?;
+    let frames = arg.next().unwrap_or("frames".into());
+    decode_raw(&filename, &frames)?;
+    Ok(())
+}
diff --git a/thermaldecoder/src/lib.rs b/src/lib.rs
similarity index 62%
rename from thermaldecoder/src/lib.rs
rename to src/lib.rs
index de0a407..f6990b4 100644
--- a/thermaldecoder/src/lib.rs
+++ b/src/lib.rs
@@ -10,58 +10,72 @@ use std::path::Path;
 use pcap_parser::traits::PcapReaderIterator;
 use pcap_parser::*;
 
-fn get_packets_without_udp_header(filename: &str) -> anyhow::Result<(Vec<Vec<u8>>, usize, usize)> {
-    let file = File::open(filename)?;
-    let mut cap = PcapNGReader::new(65535, file)?;
-    let mut i = 0;
-    let mut size = 0;
-    let mut data = vec![];
-    loop {
-        match cap.next() {
-            Ok((offset, packet)) => {
-                i += 1;
-                size += offset;
-                match packet {
-                    PcapBlockOwned::Legacy(_block) => {
-                        println!("dunno");
-                    }
-                    PcapBlockOwned::LegacyHeader(_block) => {
-                        println!("dunnoheader");
-                    }
-                    PcapBlockOwned::NG(block) => {
-                        if block.is_data_block() {
-                            match block {
-                                Block::EnhancedPacket(ref epb) => {
-                                    if epb.origlen == 6972 {
-                                        // remove udp header
-                                        data.push(epb.data[0x2a..].to_vec());
+struct PacketsIterator {
+    cap: PcapNGReader<File>,
+    i: usize,
+    size: usize,
+}
+
+impl Iterator for PacketsIterator {
+    type Item = Vec<u8>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let mut ret = None;
+        while ret.is_none() {
+            match self.cap.next() {
+                Ok((offset, packet)) => {
+                    self.i += 1;
+                    self.size += offset;
+                    match packet {
+                        PcapBlockOwned::Legacy(_block) => {
+                            println!("dunno");
+                        }
+                        PcapBlockOwned::LegacyHeader(_block) => {
+                            println!("dunnoheader");
+                        }
+                        PcapBlockOwned::NG(block) => {
+                            if block.is_data_block() {
+                                match block {
+                                    Block::EnhancedPacket(ref epb) => {
+                                        if epb.origlen == 6972 {
+                                            // remove udp header
+                                            ret = Some(epb.data[0x2a..].to_vec());
+                                        }
                                     }
-                                }
-                                Block::SimplePacket(ref ep) => {
-                                    if ep.origlen == 6972 {
-                                        println!("found one regular");
+                                    Block::SimplePacket(ref ep) => {
+                                        if ep.origlen == 6972 {
+                                            println!("found one regular");
+                                        }
+                                    }
+                                    _ => {
+                                        println!("unsupported packet");
                                     }
-                                }
-                                _ => {
-                                    println!("unsupported packet");
                                 }
                             }
                         }
                     }
+                    self.cap.consume(offset)
+                }
+                Err(PcapError::Eof) => break,
+                Err(PcapError::Incomplete) => {
+                    self.cap.refill().unwrap();
+                }
+                Err(_) => {
+                    println!("unexpected error");
+                    break;
                 }
-                cap.consume(offset)
-            }
-            Err(PcapError::Eof) => break,
-            Err(PcapError::Incomplete) => {
-                cap.refill().unwrap();
-            }
-            Err(_) => {
-                println!("unexpected error");
-                break;
             }
         }
+        ret
+    }
+}
+
+impl PacketsIterator {
+    fn new(filename: &str) -> anyhow::Result<Self> {
+        let file = File::open(filename)?;
+        let cap = PcapNGReader::new(65535, file)?;
+        Ok(PacketsIterator { cap, i: 0, size: 0 })
     }
-    Ok((data, i, size))
 }
 
 #[repr(C, packed)]
@@ -111,10 +125,31 @@ fn decode(filename: &str, frames_root: &str) -> PyResult<Vec<Vec<u16>>> {
     Ok(res.into())
 }
 
-fn decode_raw(filename: &str, frames_root: &str) -> anyhow::Result<Vec<Vec<u16>>> {
-    let (data, i, size) = get_packets_without_udp_header(filename)?;
+struct Frame {
+    header: Header,
+    pixels: Vec<u16>,
+}
 
-    println!("found {} packets, saved {}, {} size", i, data.len(), size);
+struct Decoder {}
+
+impl Decoder {
+    fn new(filename: &str) {}
+}
+
+impl Iterator for Decoder {
+    type Item = Frame;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        todo!()
+    }
+}
+
+pub fn decode_raw(filename: &str, frames_root: &str) -> anyhow::Result<Vec<Vec<u16>>> {
+    let packiter = PacketsIterator::new(filename)?;
+    let data = packiter.collect::<Vec<_>>();
+    // let (i, size) = (packiter.i, packiter.size);
+
+    //println!("found {} packets, saved {}, {} size", i, data.len(), size);
     let dump_filename = format!("{}/dump.bin", filename);
     let mut dump = File::create_new(dump_filename);
     let mut frames = vec![];
diff --git a/thermaldecoder/src/main.rs b/thermaldecoder/src/main.rs
deleted file mode 100644
index 196019e..0000000
--- a/thermaldecoder/src/main.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-//fn main() -> anyhow::Result<()> {
-//    decode_raw("dump.bin")?;
-//    Ok(())
-//}