Defining input sources for Soundmodem

[m17rt] / m17app / src / soundmodem.rs

diff --git a/m17app/src/soundmodem.rs b/m17app/src/soundmodem.rs
index 83731daa2cc3da73d4f664f4a0064c995a45ebff..b6fbf4692917d18851abb3ba0d419e5f0a3c5698 100644 (file)
--- a/m17app/src/soundmodem.rs
+++ b/m17app/src/soundmodem.rs
@@ -1,7 +1,13 @@
 use std::io::{self, ErrorKind, Read, Write};
 
 use crate::tnc::{Tnc, TncError};
+use log::debug;
 use m17core::tnc::SoftTnc;
+use std::fs::File;
+use std::path::PathBuf;
+use std::sync::mpsc::{channel, sync_channel, Receiver, Sender, SyncSender, TryRecvError};
+use std::sync::{Arc, Mutex};
+use std::time::{Duration, Instant};
 
 pub struct Soundmodem {
     tnc: SoftTnc,
@@ -10,6 +16,7 @@ pub struct Soundmodem {
 
 pub struct SoundmodemConfig {
     // sound cards, PTT, etc.
+    input: Box<dyn InputSource>,
 }
 
 impl Read for Soundmodem {
@@ -45,3 +52,77 @@ impl Tnc for Soundmodem {
         unimplemented!();
     }
 }
+
+pub enum SoundmodemEvent {
+    Kiss(Arc<[u8]>),
+    BasebandInput(Arc<[i16]>),
+}
+
+pub trait InputSource: Send + Sync + 'static {
+    fn start(&self, samples: SyncSender<SoundmodemEvent>);
+    fn close(&self);
+}
+
+pub struct InputSoundcard {
+    cpal_name: String,
+}
+
+impl InputSource for InputSoundcard {
+    fn start(&self, samples: SyncSender<SoundmodemEvent>) {
+        todo!()
+    }
+
+    fn close(&self) {
+        todo!()
+    }
+}
+
+pub struct InputRrcFile {
+    path: PathBuf,
+    end_tx: Mutex<Option<Sender<()>>>,
+}
+
+impl InputSource for InputRrcFile {
+    fn start(&self, samples: SyncSender<SoundmodemEvent>) {
+        let (end_tx, end_rx) = channel();
+        let path = self.path.clone();
+        std::thread::spawn(move || {
+            // TODO: error handling
+            let mut file = File::open(path).unwrap();
+            let mut baseband = vec![];
+            file.read_to_end(&mut baseband).unwrap();
+
+            // assuming 48 kHz for now
+            const TICK: Duration = Duration::from_millis(25);
+            const SAMPLES_PER_TICK: usize = 1200;
+
+            let mut next_tick = Instant::now() + TICK;
+            let mut buf = [0i16; SAMPLES_PER_TICK];
+            let mut idx = 0;
+
+            for sample in baseband
+                .chunks(2)
+                .map(|pair| i16::from_le_bytes([pair[0], pair[1]]))
+            {
+                buf[idx] = sample;
+                idx += 1;
+                if idx == SAMPLES_PER_TICK {
+                    if let Err(e) = samples.try_send(SoundmodemEvent::BasebandInput(buf.into())) {
+                        debug!("overflow feeding soundmodem: {e:?}");
+                    }
+                    next_tick = next_tick + TICK;
+                    idx = 0;
+                    std::thread::sleep(next_tick.duration_since(Instant::now()));
+                }
+                if end_rx.try_recv() != Err(TryRecvError::Empty) {
+                    break;
+                }
+            }
+        });
+        *self.end_tx.lock().unwrap() = Some(end_tx);
+    }
+
+    fn close(&self) {
+        let _ = self.end_tx.lock().unwrap().take();
+    }
+}