-use std::io::{self, ErrorKind, Read, Write};
-
use crate::tnc::{Tnc, TncError};
use cpal::traits::DeviceTrait;
use cpal::traits::HostTrait;
use cpal::{SampleFormat, SampleRate};
use log::debug;
use m17core::kiss::MAX_FRAME_LEN;
-use m17core::modem::{Demodulator, SoftDemodulator};
+use m17core::modem::{Demodulator, Modulator, ModulatorAction, SoftDemodulator, SoftModulator};
use m17core::tnc::SoftTnc;
+use std::collections::VecDeque;
use std::fs::File;
+use std::io::{self, ErrorKind, Read, Write};
use std::path::PathBuf;
use std::sync::mpsc::{channel, sync_channel, Receiver, Sender, SyncSender, TryRecvError};
+use std::sync::RwLock;
use std::sync::{Arc, Mutex};
use std::time::{Duration, Instant};
}
impl Soundmodem {
- pub fn new_with_input<T: InputSource>(input: T) -> Self {
+ pub fn new_with_input_and_output<I: InputSource, O: OutputSink>(input: I, output: O) -> Self {
// must create TNC here
let (event_tx, event_rx) = sync_channel(128);
let (kiss_out_tx, kiss_out_rx) = sync_channel(128);
- spawn_soundmodem_worker(event_tx.clone(), event_rx, kiss_out_tx, Box::new(input));
+ spawn_soundmodem_worker(
+ event_tx.clone(),
+ event_rx,
+ kiss_out_tx,
+ Box::new(input),
+ Box::new(output),
+ );
Self {
event_tx,
kiss_out_rx: Arc::new(Mutex::new(kiss_out_rx)),
BasebandInput(Arc<[i16]>),
Start,
Close,
+ DidReadFromOutputBuffer { len: usize, timestamp: Instant },
+ OutputUnderrun,
}
fn spawn_soundmodem_worker(
event_rx: Receiver<SoundmodemEvent>,
kiss_out_tx: SyncSender<Arc<[u8]>>,
input: Box<dyn InputSource>,
+ output: Box<dyn OutputSink>,
) {
std::thread::spawn(move || {
// TODO: should be able to provide a custom Demodulator for a soundmodem
- let mut demod = SoftDemodulator::new();
+ let mut demodulator = SoftDemodulator::new();
+ let mut modulator = SoftModulator::new();
let mut tnc = SoftTnc::new();
let mut buf = [0u8; MAX_FRAME_LEN];
+ let out_buffer = Arc::new(RwLock::new(OutputBuffer::new()));
+ let mut out_samples = [0i16; 1024];
+ let start = Instant::now();
+ let mut ptt = false;
while let Ok(ev) = event_rx.recv() {
+ // Update clock on TNC before we do anything
+ let sample_time = (start.elapsed().as_nanos() / 48000) as u64;
+ tnc.set_now(sample_time);
+
+ // Handle event
match ev {
SoundmodemEvent::Kiss(k) => {
let _n = tnc.write_kiss(&k);
}
SoundmodemEvent::BasebandInput(b) => {
for sample in &*b {
- if let Some(frame) = demod.demod(*sample) {
+ if let Some(frame) = demodulator.demod(*sample) {
tnc.handle_frame(frame);
loop {
let n = tnc.read_kiss(&mut buf);
}
}
}
+ tnc.set_data_carrier_detect(demodulator.data_carrier_detect());
+ }
+ SoundmodemEvent::Start => {
+ input.start(event_tx.clone());
+ output.start(event_tx.clone(), out_buffer.clone());
}
- SoundmodemEvent::Start => input.start(event_tx.clone()),
SoundmodemEvent::Close => break,
+ SoundmodemEvent::DidReadFromOutputBuffer { len, timestamp } => {
+ let (occupied, internal_latency) = {
+ let out_buffer = out_buffer.read().unwrap();
+ (out_buffer.samples.len(), out_buffer.latency)
+ };
+ let internal_latency = (internal_latency.as_secs_f32() * 48000.0) as usize;
+ let dynamic_latency =
+ len.saturating_sub((timestamp.elapsed().as_secs_f32() * 48000.0) as usize);
+ modulator.update_output_buffer(
+ occupied,
+ 48000,
+ internal_latency + dynamic_latency,
+ );
+ }
+ SoundmodemEvent::OutputUnderrun => {
+ // TODO: cancel transmission, send empty data frame to host
+ }
+ }
+
+ // Update PTT state
+ let new_ptt = tnc.ptt();
+ if new_ptt != ptt {
+ if new_ptt {
+ // turn it on
+ } else {
+ // turn it off
+ }
+ }
+ ptt = new_ptt;
+
+ // Let the modulator do what it wants
+ while let Some(action) = modulator.run() {
+ match action {
+ ModulatorAction::SetIdle(idling) => {
+ out_buffer.write().unwrap().idling = idling;
+ }
+ ModulatorAction::GetNextFrame => {
+ modulator.provide_next_frame(tnc.read_tx_frame());
+ }
+ ModulatorAction::ReadOutput => loop {
+ let n = modulator.read_output_samples(&mut out_samples);
+ if n == 0 {
+ break;
+ }
+ let mut out_buffer = out_buffer.write().unwrap();
+ for s in &out_samples[0..n] {
+ out_buffer.samples.push_back(*s);
+ }
+ },
+ ModulatorAction::TransmissionWillEnd(in_samples) => {
+ tnc.set_tx_end_time(in_samples);
+ }
+ }
}
}
});
}
pub struct InputSoundcard {
+ // TODO: allow for inversion both here and in output
cpal_name: Option<String>,
end_tx: Mutex<Option<Sender<()>>>,
}
.build_input_stream(
&config.into(),
move |data: &[i16], _info: &cpal::InputCallbackInfo| {
- debug!("input has given us {} samples", data.len());
let out: Vec<i16> = data.iter().map(|s| *s).collect();
let _ = samples.try_send(SoundmodemEvent::BasebandInput(out.into()));
},
let _ = self.end_tx.lock().unwrap().take();
}
}
+
+pub struct NullInputSource {
+ end_tx: Mutex<Option<Sender<()>>>,
+}
+
+impl NullInputSource {
+ pub fn new() -> Self {
+ Self {
+ end_tx: Mutex::new(None),
+ }
+ }
+}
+
+impl InputSource for NullInputSource {
+ fn start(&self, samples: SyncSender<SoundmodemEvent>) {
+ let (end_tx, end_rx) = channel();
+ std::thread::spawn(move || {
+ // 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;
+
+ loop {
+ std::thread::sleep(next_tick.duration_since(Instant::now()));
+ next_tick = next_tick + TICK;
+ if end_rx.try_recv() != Err(TryRecvError::Empty) {
+ break;
+ }
+ if let Err(e) = samples.try_send(SoundmodemEvent::BasebandInput(
+ [0i16; SAMPLES_PER_TICK].into(),
+ )) {
+ debug!("overflow feeding soundmodem: {e:?}");
+ }
+ }
+ });
+ *self.end_tx.lock().unwrap() = Some(end_tx);
+ }
+
+ fn close(&self) {
+ let _ = self.end_tx.lock().unwrap().take();
+ }
+}
+
+pub struct OutputBuffer {
+ idling: bool,
+ // TODO: something more efficient
+ samples: VecDeque<i16>,
+ latency: Duration,
+}
+
+impl OutputBuffer {
+ pub fn new() -> Self {
+ Self {
+ idling: true,
+ samples: VecDeque::new(),
+ latency: Duration::ZERO,
+ }
+ }
+}
+
+pub trait OutputSink: Send + Sync + 'static {
+ fn start(&self, event_tx: SyncSender<SoundmodemEvent>, buffer: Arc<RwLock<OutputBuffer>>);
+ fn close(&self);
+}
+
+pub struct OutputRrcFile {
+ path: PathBuf,
+ end_tx: Mutex<Option<Sender<()>>>,
+}
+
+impl OutputRrcFile {
+ pub fn new(path: PathBuf) -> Self {
+ Self {
+ path,
+ end_tx: Mutex::new(None),
+ }
+ }
+}
+
+impl OutputSink for OutputRrcFile {
+ fn start(&self, event_tx: SyncSender<SoundmodemEvent>, buffer: Arc<RwLock<OutputBuffer>>) {
+ let (end_tx, end_rx) = channel();
+ let path = self.path.clone();
+ std::thread::spawn(move || {
+ // TODO: error handling
+ let mut file = File::create(path).unwrap();
+
+ // assuming 48 kHz for now
+ const TICK: Duration = Duration::from_millis(25);
+ const SAMPLES_PER_TICK: usize = 1200;
+
+ // flattened BE i16s for writing
+ let mut buf = [0u8; SAMPLES_PER_TICK * 2];
+ let mut next_tick = Instant::now() + TICK;
+
+ loop {
+ std::thread::sleep(next_tick.duration_since(Instant::now()));
+ next_tick = next_tick + TICK;
+ if end_rx.try_recv() != Err(TryRecvError::Empty) {
+ break;
+ }
+ // For now only write deliberately modulated (non-idling) samples
+ // Multiple transmissions will get smooshed together
+ let mut buf_used = 0;
+
+ let mut buffer = buffer.write().unwrap();
+ for out in buf.chunks_mut(2) {
+ if let Some(s) = buffer.samples.pop_front() {
+ let be = s.to_le_bytes();
+ out.copy_from_slice(&[be[0], be[1]]);
+ buf_used += 2;
+ } else if !buffer.idling {
+ debug!("output rrc file had underrun");
+ let _ = event_tx.send(SoundmodemEvent::OutputUnderrun);
+ break;
+ }
+ }
+ if let Err(e) = file.write_all(&buf[0..buf_used]) {
+ debug!("failed to write to rrc file: {e:?}");
+ break;
+ }
+ let _ = event_tx.send(SoundmodemEvent::DidReadFromOutputBuffer {
+ len: buf_used / 2,
+ timestamp: Instant::now(),
+ });
+ }
+ });
+ *self.end_tx.lock().unwrap() = Some(end_tx);
+ }
+
+ fn close(&self) {
+ let _ = self.end_tx.lock().unwrap().take();
+ }
+}
+
+pub struct NullOutputSink {
+ end_tx: Mutex<Option<Sender<()>>>,
+}
+
+impl NullOutputSink {
+ pub fn new() -> Self {
+ Self {
+ end_tx: Mutex::new(None),
+ }
+ }
+}
+
+impl OutputSink for NullOutputSink {
+ fn start(&self, event_tx: SyncSender<SoundmodemEvent>, buffer: Arc<RwLock<OutputBuffer>>) {
+ let (end_tx, end_rx) = channel();
+ std::thread::spawn(move || {
+ // 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;
+
+ loop {
+ std::thread::sleep(next_tick.duration_since(Instant::now()));
+ next_tick = next_tick + TICK;
+ if end_rx.try_recv() != Err(TryRecvError::Empty) {
+ break;
+ }
+
+ let mut buffer = buffer.write().unwrap();
+ let mut taken = 0;
+ for _ in 0..SAMPLES_PER_TICK {
+ if !buffer.samples.pop_front().is_some() {
+ if !buffer.idling {
+ debug!("null output had underrun");
+ let _ = event_tx.send(SoundmodemEvent::OutputUnderrun);
+ break;
+ }
+ } else {
+ taken += 1;
+ }
+ }
+ let _ = event_tx.send(SoundmodemEvent::DidReadFromOutputBuffer {
+ len: taken,
+ timestamp: Instant::now(),
+ });
+ }
+ });
+ *self.end_tx.lock().unwrap() = Some(end_tx);
+ }
+
+ fn close(&self) {
+ let _ = self.end_tx.lock().unwrap().take();
+ }
+}
projects / m17rt / blobdiff