diff --git a/Cargo.lock b/Cargo.lock
index 8cec6c8..0f24e2b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -33,6 +33,54 @@ dependencies = [
  "pkg-config",
 ]
 
+[[package]]
+name = "anstream"
+version = "0.6.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e2e1ebcb11de5c03c67de28a7df593d32191b44939c482e97702baaaa6ab6a5"
+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8901269c6307e8d93993578286ac0edf7f195079ffff5ebdeea6a59ffb7e36bc"
+
+[[package]]
+name = "anstyle-parse"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c75ac65da39e5fe5ab759307499ddad880d724eed2f6ce5b5e8a26f4f387928c"
+dependencies = [
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle-query"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e28923312444cdd728e4738b3f9c9cac739500909bb3d3c94b43551b16517648"
+dependencies = [
+ "windows-sys 0.52.0",
+]
+
+[[package]]
+name = "anstyle-wincon"
+version = "3.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1cd54b81ec8d6180e24654d0b371ad22fc3dd083b6ff8ba325b72e00c87660a7"
+dependencies = [
+ "anstyle",
+ "windows-sys 0.52.0",
+]
+
 [[package]]
 name = "asio-sys"
 version = "0.2.1"
@@ -141,6 +189,52 @@ dependencies = [
  "libloading",
 ]
 
+[[package]]
+name = "clap"
+version = "4.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80c21025abd42669a92efc996ef13cfb2c5c627858421ea58d5c3b331a6c134f"
+dependencies = [
+ "clap_builder",
+ "clap_derive",
+]
+
+[[package]]
+name = "clap_builder"
+version = "4.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "458bf1f341769dfcf849846f65dffdf9146daa56bcd2a47cb4e1de9915567c99"
+dependencies = [
+ "anstream",
+ "anstyle",
+ "clap_lex",
+ "strsim",
+]
+
+[[package]]
+name = "clap_derive"
+version = "4.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "307bc0538d5f0f83b8248db3087aa92fe504e4691294d0c96c0eabc33f47ba47"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.48",
+]
+
+[[package]]
+name = "clap_lex"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "98cc8fbded0c607b7ba9dd60cd98df59af97e84d24e49c8557331cfc26d301ce"
+
+[[package]]
+name = "colorchoice"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "acbf1af155f9b9ef647e42cdc158db4b64a1b61f743629225fde6f3e0be2a7c7"
+
 [[package]]
 name = "combine"
 version = "4.6.6"
@@ -242,6 +336,12 @@ version = "0.14.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "290f1a1d9242c78d09ce40a5e87e7554ee637af1351968159f4952f028f75604"
 
+[[package]]
+name = "heck"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
+
 [[package]]
 name = "home"
 version = "0.5.9"
@@ -385,7 +485,11 @@ dependencies = [
 name = "maudio-router"
 version = "0.1.0"
 dependencies = [
+ "clap",
  "cpal",
+ "num",
+ "num-traits",
+ "rustfft",
 ]
 
 [[package]]
@@ -473,6 +577,40 @@ dependencies = [
  "minimal-lexical",
 ]
 
+[[package]]
+name = "num"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b05180d69e3da0e530ba2a1dae5110317e49e3b7f3d41be227dc5f92e49ee7af"
+dependencies = [
+ "num-bigint",
+ "num-complex",
+ "num-integer",
+ "num-iter",
+ "num-rational",
+ "num-traits",
+]
+
+[[package]]
+name = "num-bigint"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "608e7659b5c3d7cba262d894801b9ec9d00de989e8a82bd4bef91d08da45cdc0"
+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-complex"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23c6602fda94a57c990fe0df199a035d83576b496aa29f4e634a8ac6004e68a6"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "num-derive"
 version = "0.3.3"
@@ -495,6 +633,38 @@ dependencies = [
  "syn 2.0.48",
 ]
 
+[[package]]
+name = "num-integer"
+version = "0.1.46"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7969661fd2958a5cb096e56c8e1ad0444ac2bbcd0061bd28660485a44879858f"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "num-iter"
+version = "0.1.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d869c01cc0c455284163fd0092f1f93835385ccab5a98a0dcc497b2f8bf055a9"
+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-rational"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0638a1c9d0a3c0914158145bc76cff373a75a627e6ecbfb71cbe6f453a5a19b0"
+dependencies = [
+ "autocfg",
+ "num-bigint",
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.18"
@@ -623,6 +793,15 @@ dependencies = [
  "syn 2.0.48",
 ]
 
+[[package]]
+name = "primal-check"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9df7f93fd637f083201473dab4fee2db4c429d32e55e3299980ab3957ab916a0"
+dependencies = [
+ "num-integer",
+]
+
 [[package]]
 name = "proc-macro-crate"
 version = "1.3.1"
@@ -701,6 +880,21 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
 
+[[package]]
+name = "rustfft"
+version = "6.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43806561bc506d0c5d160643ad742e3161049ac01027b5e6d7524091fd401d86"
+dependencies = [
+ "num-complex",
+ "num-integer",
+ "num-traits",
+ "primal-check",
+ "strength_reduce",
+ "transpose",
+ "version_check",
+]
+
 [[package]]
 name = "rustix"
 version = "0.38.31"
@@ -741,6 +935,18 @@ version = "1.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6ecd384b10a64542d77071bd64bd7b231f4ed5940fba55e98c3de13824cf3d7"
 
+[[package]]
+name = "strength_reduce"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe895eb47f22e2ddd4dabc02bce419d2e643c8e3b585c78158b349195bc24d82"
+
+[[package]]
+name = "strsim"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ee073c9e4cd00e28217186dbe12796d692868f432bf2e97ee73bed0c56dfa01"
+
 [[package]]
 name = "syn"
 version = "1.0.109"
@@ -800,12 +1006,34 @@ dependencies = [
  "winnow",
 ]
 
+[[package]]
+name = "transpose"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6522d49d03727ffb138ae4cbc1283d3774f0d10aa7f9bf52e6784c45daf9b23"
+dependencies = [
+ "num-integer",
+ "strength_reduce",
+]
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
+[[package]]
+name = "utf8parse"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
+
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
 [[package]]
 name = "walkdir"
 version = "2.4.0"
diff --git a/Cargo.toml b/Cargo.toml
index 4b8c328..b748a28 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,4 +6,8 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-cpal = { git = "https://github.com/RustAudio/cpal.git", features = ["asio"] }
\ No newline at end of file
+clap = { version = "4.5.0", features = ["derive"] }
+cpal = { git = "https://github.com/RustAudio/cpal.git", features = ["asio"] }
+num = "0.4.1"
+num-traits = "0.2.18"
+rustfft = "6.2.0"
diff --git a/src/args.rs b/src/args.rs
new file mode 100644
index 0000000..6a618e4
--- /dev/null
+++ b/src/args.rs
@@ -0,0 +1,34 @@
+use clap::{Args, Parser, Subcommand};
+
+#[derive(Parser, Debug)]
+#[command(name = "Maudio Router")]
+#[command(version = "0.1.0")]
+#[command(about = "A network audio router.", long_about = None)]
+pub struct Cli {
+    #[command(subcommand)]
+    command: Commands,
+}
+
+#[derive(Subcommand, Debug)]
+enum Commands {
+    /// Run router server
+    Server(Server),
+    /// Run router client
+    Client(Client),
+}
+
+#[derive(Args, Debug)]
+struct Server {
+    #[arg(short, long)]
+    device: String,
+}
+
+#[derive(Args, Debug)]
+struct Client {
+    #[arg(short, long)]
+    server_ip: String,
+    #[arg(short, long)]
+    port: String,
+    #[arg(short, long)]
+    device: String,
+}
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index c4d093e..21ffca3 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,15 +1,59 @@
-use std::sync::{Arc, Mutex};
+mod args;
 
+use std::{io::Write, sync::{Arc, Mutex}};
+
+use clap::Parser;
 use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
 
-fn main() {
-    let host;
-    #[cfg(target_os = "windows")]
-    {
-        host = cpal::host_from_id(cpal::HostId::Asio).expect("failed to initialise ASIO host");
+use crate::args::Cli;
+fn reshape_audio_data<T>(input: &[T], channels: usize) -> Vec<Vec<T>>
+where
+    T: Clone,
+{
+    let mut output = vec![vec![]; channels];
+    for frame in input.chunks(channels) {
+        for (i, sample) in frame.iter().enumerate() {
+            output[i].push(sample.clone());
+        }
     }
+    output
+}
 
-    let device = host.devices().unwrap().find(|d| d.name().unwrap() == "Voicemeeter Insert Virtual ASIO").unwrap();
+fn to_flat_audio_data<T>(input: &[Vec<T>]) -> Vec<T>
+where
+    T: Clone,
+{
+    let channels = input.len();
+    let frames = input[0].len();
+    let mut output = vec![];
+    for i in 0..frames {
+        for j in 0..channels {
+            output.push(input[j][i].clone());
+        }
+    }
+    output
+}
+
+fn main() {
+    let cli = Cli::parse();
+
+    println!("{:?}", cli);
+
+    let host = cpal::default_host();
+
+    std::thread::sleep(std::time::Duration::from_secs(1));
+
+    println!("Available input devices:");
+    host.input_devices().unwrap().enumerate().for_each(|(i, device)| println!("{}: {}", i, device.name().unwrap()));
+
+    print!("Select input device [0~{}]> ", host.input_devices().unwrap().count() - 1);
+    std::io::stdout().flush().unwrap();
+
+    let mut input = String::new();
+    std::io::stdin().read_line(&mut input).unwrap();
+    let input = input.trim().parse::<usize>().unwrap();
+
+    let device = host.input_devices().unwrap().nth(input).unwrap();
 
     let audio_data = Arc::new(Mutex::new(vec![])); 
 
@@ -30,17 +74,11 @@ fn main() {
         &device.default_output_config().unwrap().config(), 
         {
             let audio_data = audio_data.clone();
-            let mut count = 0f32;
             move |data: &mut [f32], _: &cpal::OutputCallbackInfo| {
-                let mut audio_data = audio_data.lock().unwrap().clone();
-                for frame in audio_data.chunks_mut(22) {
-                    let value = count.sin();
-                    let value2 = (count / 2.).sin();
-                    for sample in frame.iter_mut() {
-                        *sample += value * 0.1 + value2 * 0.1;
-                    }
-                    count += 0.05;
-                }
+                let audio_data = audio_data.lock().unwrap().clone();
+                let audio_data = reshape_audio_data(&audio_data, 22);
+
+                let audio_data = to_flat_audio_data(&audio_data);
                 data.copy_from_slice(&audio_data);
             }
         },
@@ -51,5 +89,7 @@ fn main() {
     input_stream.play().unwrap();
     output_stream.play().unwrap();
 
-    std::thread::sleep(std::time::Duration::from_secs(10));
+    std::thread::sleep(std::time::Duration::from_secs(1000));
+    drop(input_stream);
+    drop(output_stream);
 }