listener: basic implementation of whisper

.gitignore

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+.devcontainer/
+scratch/

listener/.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+debug
+target
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+# Generated by cargo mutants
+# Contains mutation testing data
+**/mutants.out*/
+
+# rustc will dump stack traces when hitting an internal compiler error to PWD
+rustc-ice-*.txt
+
+# RustRover
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+# Models dir
+models/

listener/Cargo.lock

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listener/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "scannerbot-listener"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+whisper-rs = "0.16.0"

listener/src/audio.rs

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+use std::process::{Command, Stdio};
+
+pub fn decode(input: &str) -> Result<Vec<f32>, Box<dyn std::error::Error>> {
+    let output = Command::new("ffmpeg")
+        .args([
+            "-i", input,
+            "-ar", "16000", // resample 16kHz
+            "-ac", "1", // mono
+            "-f", "f32le", // use raw f32 little endian samples
+            "-" // stdout
+        ])
+        .stderr(Stdio::null())
+        .output()?;
+
+    let audio_data = output.stdout
+            .chunks_exact(4)
+            .map(|b| f32::from_le_bytes(b.try_into().unwrap()))
+            .collect();
+    
+    Ok(audio_data)
+}

listener/src/main.rs

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+use whisper_rs::{WhisperContext, WhisperContextParameters, FullParams, SamplingStrategy};
+
+mod audio;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    //println!("Hello, world!");
+
+    //let audio = audio::decode("../scratch/audio/gtav_police_sample.wav")?;
+    let audio = audio::decode(&std::env::args().nth(2).unwrap())?;
+    
+    let path_to_model = std::env::args().nth(1).unwrap();
+
+    let ctx = WhisperContext::new_with_params(
+        path_to_model, 
+        WhisperContextParameters::default()
+    ).expect("failed to load model");
+
+    let params = FullParams::new(SamplingStrategy::BeamSearch {
+        beam_size: 5, patience: -1.0
+    });
+
+    let mut state = ctx.create_state().expect("failed to create state");
+    state
+        .full(params, &audio[..])
+        .expect("failed to run model");
+
+    for segment in state.as_iter() {
+        println!(
+            "[{} - {}]: {}",
+            segment.start_timestamp(),
+            segment.end_timestamp(),
+            segment
+        );
+    }
+
+    Ok(())
+
+}