X-Git-Url: https://code.octet-stream.net/m17rt/blobdiff_plain/0165bc18338671186d2624fb23e9f0c7aff0e49f..0ae30668b7142e60de9efcc6e2e2724f9ec77962:/m17codec2/src/rx.rs?ds=sidebyside

diff --git a/m17codec2/src/rx.rs b/m17codec2/src/rx.rs
new file mode 100644
index 0000000..c6d3cdc
--- /dev/null
+++ b/m17codec2/src/rx.rs
@@ -0,0 +1,252 @@
+use crate::M17Codec2Error;
+use codec2::{Codec2, Codec2Mode};
+use cpal::traits::DeviceTrait;
+use cpal::traits::HostTrait;
+use cpal::traits::StreamTrait;
+use cpal::{Sample, SampleFormat, SampleRate};
+use log::debug;
+use m17app::adapter::StreamAdapter;
+use m17app::app::TxHandle;
+use m17app::error::AdapterError;
+use m17app::link_setup::LinkSetup;
+use rubato::Resampler;
+use rubato::SincFixedIn;
+use rubato::SincInterpolationParameters;
+use std::collections::VecDeque;
+use std::fs::File;
+use std::io::Write;
+use std::path::Path;
+use std::sync::{
+    mpsc::{channel, Receiver, Sender},
+    Arc, Mutex,
+};
+
+/// Write one or more 8-byte chunks of 3200-bit Codec2 to a raw S16LE file
+/// and return the samples.
+pub fn decode_codec2<P: AsRef<Path>>(data: &[u8], out_path: P) -> Vec<i16> {
+    let codec2 = Codec2::new(Codec2Mode::MODE_3200);
+    let var_name = codec2;
+    let mut codec = var_name;
+    let mut all_samples: Vec<i16> = vec![];
+    for i in 0..(data.len() / 8) {
+        let mut samples = vec![0; codec.samples_per_frame()];
+        codec.decode(&mut samples, &data[i * 8..((i + 1) * 8)]);
+        all_samples.append(&mut samples);
+    }
+    let mut speech_out = File::create(out_path).unwrap();
+    for b in &all_samples {
+        speech_out.write_all(&b.to_le_bytes()).unwrap();
+    }
+    all_samples
+}
+
+/// Subscribes to M17 streams and attempts to play the decoded Codec2
+pub struct Codec2RxAdapter {
+    state: Arc<Mutex<AdapterState>>,
+    output_card: Option<String>,
+}
+
+impl Codec2RxAdapter {
+    pub fn new() -> Self {
+        Self {
+            state: Arc::new(Mutex::new(AdapterState {
+                tx: None,
+                out_buf: VecDeque::new(),
+                codec2: Codec2::new(Codec2Mode::MODE_3200),
+                end_tx: None,
+                resampler: None,
+            })),
+            output_card: None,
+        }
+    }
+
+    pub fn set_output_card<S: Into<String>>(&mut self, card_name: S) {
+        self.output_card = Some(card_name.into());
+    }
+}
+
+impl Default for Codec2RxAdapter {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+struct AdapterState {
+    tx: Option<TxHandle>,
+    /// Circular buffer of output samples for playback
+    out_buf: VecDeque<i16>,
+    codec2: Codec2,
+    end_tx: Option<Sender<()>>,
+    resampler: Option<SincFixedIn<f32>>,
+}
+
+impl StreamAdapter for Codec2RxAdapter {
+    fn start(&self, handle: TxHandle) -> Result<(), AdapterError> {
+        self.state.lock().unwrap().tx = Some(handle);
+
+        let (end_tx, end_rx) = channel();
+        let (setup_tx, setup_rx) = channel();
+        let state = self.state.clone();
+        let output_card = self.output_card.clone();
+        std::thread::spawn(move || stream_thread(end_rx, setup_tx, state, output_card));
+        self.state.lock().unwrap().end_tx = Some(end_tx);
+        // Propagate any errors arising in the thread
+        let sample_rate = setup_rx.recv()??;
+        debug!("selected codec2 output sample rate {sample_rate}");
+        if sample_rate != 8000 {
+            let params = SincInterpolationParameters {
+                sinc_len: 256,
+                f_cutoff: 0.95,
+                oversampling_factor: 128,
+                interpolation: rubato::SincInterpolationType::Cubic,
+                window: rubato::WindowFunction::BlackmanHarris2,
+            };
+            // TODO: fix unwrap
+            self.state.lock().unwrap().resampler =
+                Some(SincFixedIn::new(sample_rate as f64 / 8000f64, 1.0, params, 160, 1).unwrap());
+        }
+        Ok(())
+    }
+
+    fn close(&self) -> Result<(), AdapterError> {
+        let mut state = self.state.lock().unwrap();
+        state.tx = None;
+        state.end_tx = None;
+        Ok(())
+    }
+
+    fn stream_began(&self, _link_setup: LinkSetup) {
+        // for now we will assume:
+        // - unencrypted
+        // - data type is Voice (Codec2 3200), not Voice+Data
+        // TODO: is encryption handled here or in M17App, such that we get a decrypted stream?
+        // TODO: handle the Voice+Data combination with Codec2 1600
+        self.state.lock().unwrap().codec2 = Codec2::new(Codec2Mode::MODE_3200);
+    }
+
+    fn stream_data(&self, _frame_number: u16, _is_final: bool, data: Arc<[u8; 16]>) {
+        let mut state = self.state.lock().unwrap();
+        for encoded in data.chunks(8) {
+            if state.out_buf.len() < 8192 {
+                let mut samples = [i16::EQUILIBRIUM; 160]; // while assuming 3200
+                state.codec2.decode(&mut samples, encoded);
+                if let Some(resampler) = state.resampler.as_mut() {
+                    let samples_f: Vec<f32> =
+                        samples.iter().map(|s| *s as f32 / 16384.0f32).collect();
+                    let res = resampler.process(&[samples_f], None).unwrap();
+                    for s in &res[0] {
+                        state.out_buf.push_back((s * 16383.0f32) as i16);
+                    }
+                } else {
+                    // TODO: maybe get rid of VecDeque so we can decode directly into ring buffer?
+                    for s in samples {
+                        state.out_buf.push_back(s);
+                    }
+                }
+            } else {
+                debug!("out_buf overflow");
+            }
+        }
+    }
+}
+
+fn output_cb(data: &mut [i16], state: &Mutex<AdapterState>, channels: u16) {
+    let mut state = state.lock().unwrap();
+    for d in data.chunks_mut(channels as usize) {
+        d.fill(state.out_buf.pop_front().unwrap_or(i16::EQUILIBRIUM));
+    }
+}
+
+/// Create and manage the stream from a dedicated thread since it's `!Send`
+fn stream_thread(
+    end: Receiver<()>,
+    setup_tx: Sender<Result<u32, AdapterError>>,
+    state: Arc<Mutex<AdapterState>>,
+    output_card: Option<String>,
+) {
+    let host = cpal::default_host();
+    let device = if let Some(output_card) = output_card {
+        // TODO: more error handling for unwraps
+        match host
+            .output_devices()
+            .unwrap()
+            .find(|d| d.name().unwrap() == output_card)
+        {
+            Some(d) => d,
+            None => {
+                let _ = setup_tx.send(Err(M17Codec2Error::CardUnavailable(output_card).into()));
+                return;
+            }
+        }
+    } else {
+        match host.default_output_device() {
+            Some(d) => d,
+            None => {
+                let _ = setup_tx.send(Err(M17Codec2Error::DefaultCardUnavailable.into()));
+                return;
+            }
+        }
+    };
+    let card_name = device.name().unwrap();
+    let mut configs = match device.supported_output_configs() {
+        Ok(c) => c,
+        Err(e) => {
+            let _ = setup_tx.send(Err(
+                M17Codec2Error::OutputConfigsUnavailable(card_name, e).into()
+            ));
+            return;
+        }
+    };
+    let config = match configs.find(|c| {
+        (c.channels() == 1 || c.channels() == 2) && c.sample_format() == SampleFormat::I16
+    }) {
+        Some(c) => c,
+        None => {
+            let _ = setup_tx.send(Err(
+                M17Codec2Error::SupportedOutputUnavailable(card_name).into()
+            ));
+            return;
+        }
+    };
+
+    let target_sample_rate =
+        if config.min_sample_rate().0 <= 8000 && config.max_sample_rate().0 >= 8000 {
+            8000
+        } else {
+            config.min_sample_rate().0
+        };
+    let channels = config.channels();
+
+    let config = config.with_sample_rate(SampleRate(target_sample_rate));
+    let stream = match device.build_output_stream(
+        &config.into(),
+        move |data: &mut [i16], _info: &cpal::OutputCallbackInfo| {
+            output_cb(data, &state, channels);
+        },
+        |e| {
+            // trigger end_tx here? always more edge cases
+            debug!("error occurred in codec2 playback: {e:?}");
+        },
+        None,
+    ) {
+        Ok(s) => s,
+        Err(e) => {
+            let _ = setup_tx.send(Err(
+                M17Codec2Error::OutputStreamBuildError(card_name, e).into()
+            ));
+            return;
+        }
+    };
+    match stream.play() {
+        Ok(()) => (),
+        Err(e) => {
+            let _ = setup_tx.send(Err(
+                M17Codec2Error::OutputStreamPlayError(card_name, e).into()
+            ));
+            return;
+        }
+    }
+    let _ = setup_tx.send(Ok(target_sample_rate));
+    let _ = end.recv();
+    // it seems concrete impls of Stream have a Drop implementation that will handle termination
+}