--- /dev/null
+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
+}
projects / m17rt / blobdiff