move rust to root

src/main.rs

@@ -0,0 +1,146 @@
+use whisper_rs::{WhisperContext, FullParams, SamplingStrategy, WhisperError};
+use cpal::traits::{HostTrait, DeviceTrait, StreamTrait};
+use signal_hook::{iterator::Signals, consts::signal::SIGINT};
+use std::time::{Duration, Instant};
+use chrono;
+use clap::Parser;
+
+#[derive(Parser, Debug)]
+struct Flags {
+   #[arg(long, default_value = "../models/ggml-tiny.en.bin")]
+   model: String,
+
+   #[arg(long, default_value = "8")]
+   threads: i32,
+
+   #[arg(long, default_value = "0.8")]
+   stream_churn: f32,
+   #[arg(long, default_value = "5")]
+   stream_step: u64,
+
+   wav: Option<String>,
+}
+
+fn main() {
+   let flags = Flags::parse();
+
+   let w = new_whisper(flags.model, flags.threads).unwrap();
+   let stream_churn = flags.stream_churn;
+   let stream_step = Duration::new(flags.stream_step, 0);
+   match flags.wav {
+      Some(wav) => {
+         let (header, data) = wav::read(
+            &mut std::fs::File::open(wav).expect("failed to open $WAV"),
+         ).expect("failed to decode $WAV");
+         assert!(header.channel_count == 1);
+         assert!(header.sampling_rate == 16000);
+         let data16 = data.as_sixteen().expect("wav is not 32bit floats");
+         let audio_data = &whisper_rs::convert_integer_to_float_audio(&data16);
+
+         let result = w.transcribe(&audio_data).unwrap();
+         println!("{}", result);
+      },
+      None => {
+         let host = cpal::default_host();
+         let device = host.default_input_device().unwrap();
+         let cfg = device.supported_input_configs()
+            .unwrap()
+            .filter(|x| x.sample_format() == cpal::SampleFormat::F32)
+            .nth(0)
+            .unwrap()
+            .with_max_sample_rate();
+
+         let downsample_ratio = cfg.channels() as f32 * (cfg.sample_rate().0 as f32 / 16000.0);
+         let mut buffer = vec![];
+         let mut last = Instant::now();
+         let stream = device.build_input_stream(
+            &cfg.clone().into(),
+            move |data: &[f32], _: &cpal::InputCallbackInfo| {
+               let mut downsampled_data = vec![];
+               for i in 0..(data.len() as f32 / downsample_ratio) as usize {
+                  let mut upsampled = i as f32 * downsample_ratio;
+                  if upsampled > (data.len()-1) as f32 {
+                     upsampled = (data.len()-1) as f32
+                  }
+                  downsampled_data.push(data[upsampled as usize]);
+               }
+               downsampled_data.iter().for_each(|x| buffer.push(*x));
+               if Instant::now() - last > stream_step {
+                  let result = w.transcribe(&buffer).unwrap();
+                  eprintln!("{}", chrono::Local::now());
+                  println!("{}", result);
+
+                  let retain = buffer.len() - (buffer.len() as f32 * stream_churn) as usize;
+                  for i in retain..buffer.len() {
+                     buffer[i - retain] = buffer[i]
+                  }
+                  buffer.truncate(retain);
+                  last = Instant::now();
+               }
+            },
+            move |err| {
+               eprintln!("input error: {}", err)
+            },
+            None,
+         ).unwrap();
+         stream.play().unwrap();
+
+         eprintln!("listening on {}", device.name().unwrap());
+         let mut signals = Signals::new(&[SIGINT]).unwrap();
+         for sig in signals.forever() {
+            eprintln!("sig {}", sig);
+            break;
+         }
+         stream.pause().unwrap();
+      },
+   };
+}
+
+struct Whisper {
+   ctx: WhisperContext,
+   threads: i32,
+}
+
+fn new_whisper(model_path: String, threads: i32) -> Result<Whisper, String> {
+   match WhisperContext::new(&model_path) {
+      Ok(ctx) => Ok(Whisper{
+         ctx: ctx,
+         threads: threads,
+      }),
+      Err(msg) => Err(format!("failed to load {}: {}", model_path, msg)),
+   }
+}
+
+impl Whisper {
+   fn transcribe(&self, data: &Vec<f32>) -> Result<String, String> {
+      match self._transcribe(&data) {
+         Ok(result) => Ok(result),
+         Err(msg) => Err(format!("failed to transcribe: {}", msg)),
+      }
+   }
+
+   fn _transcribe(&self, data: &Vec<f32>) -> Result<String, WhisperError> {
+      let mut params = FullParams::new(SamplingStrategy::Greedy { best_of: 0 });
+      params.set_no_context(true);
+      params.set_n_threads(self.threads);
+      params.set_translate(false);
+      params.set_detect_language(false);
+      params.set_language(Some("en"));
+      params.set_print_special(false);
+      params.set_print_progress(false);
+      params.set_print_realtime(false);
+      params.set_print_timestamps(false);
+
+      let mut state = self.ctx.create_state()?;
+      state.full(params, &data[..])?;
+
+      let num_segments = state.full_n_segments()?;
+      let mut result = "".to_string();
+      for i in 0..num_segments {
+         let segment = state.full_get_segment_text(i)?;
+         result = format!("{} {}", result, segment);
+      }
+
+      Ok(result)
+   }
+}