-/// 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 Codec2Adapter {
- state: Arc<Mutex<AdapterState>>,
- output_card: Option<String>,
-}
-
-impl Codec2Adapter {
- 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 Codec2Adapter {
- 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 Codec2Adapter {
- 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(&vec![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
-}
-
-/// Transmits a wave file as an M17 stream
-pub struct WavePlayer;
-
-impl WavePlayer {
- /// Plays a wave file (blocking).
- ///
- /// * `path`: wave file to transmit, must be 8 kHz mono and 16-bit LE
- /// * `tx`: a `TxHandle` obtained from an `M17App`
- /// * `source`: address of transmission source
- /// * `destination`: address of transmission destination
- /// * `channel_access_number`: from 0 to 15, usually 0
- pub fn play(
- path: PathBuf,
- tx: TxHandle,
- source: &M17Address,
- destination: &M17Address,
- channel_access_number: u8,
- ) {
- let mut reader = hound::WavReader::open(path).unwrap();
- let mut samples = reader.samples::<i16>();
-
- let mut codec = Codec2::new(Codec2Mode::MODE_3200);
- let mut in_buf = [0i16; 160];
- let mut out_buf = [0u8; 16];
- let mut lsf_chunk: usize = 0;
- const TICK: Duration = Duration::from_millis(40);
- let mut next_tick = Instant::now() + TICK;
- let mut frame_number = 0;
-
- let mut setup = LinkSetup::new_voice(source, destination);
- setup.set_channel_access_number(channel_access_number);
- tx.transmit_stream_start(&setup);
-
- loop {
- let mut last_one = false;
- for out in out_buf.chunks_mut(8) {
- for i in in_buf.iter_mut() {
- let sample = match samples.next() {
- Some(Ok(sample)) => sample,
- _ => {
- last_one = true;
- 0
- }
- };
- *i = sample;
- }
- codec.encode(out, &in_buf);
- }
- tx.transmit_stream_next(&StreamFrame {
- lich_idx: lsf_chunk as u8,
- lich_part: setup.lich_part(lsf_chunk as u8),
- frame_number,
- end_of_stream: last_one,
- stream_data: out_buf,
- });
- frame_number += 1;
- lsf_chunk = (lsf_chunk + 1) % 6;
-
- if last_one {
- break;
- }
-
- std::thread::sleep(next_tick.duration_since(Instant::now()));
- next_tick += TICK;
- }
- }
-}
-
-#[derive(Debug, Error)]
-pub enum M17Codec2Error {
- #[error("selected card '{0}' does not exist or is in use")]
- CardUnavailable(String),
-
- #[error("default output card is unavailable")]
- DefaultCardUnavailable,
-
- #[error("selected card '{0}' failed to list available output configs: '{1}'")]
- OutputConfigsUnavailable(String, #[source] cpal::SupportedStreamConfigsError),
-
- #[error("selected card '{0}' did not offer a compatible output config type, either due to hardware limitations or because it is currently in use")]
- SupportedOutputUnavailable(String),
-
- #[error("selected card '{0}' was unable to build an output stream: '{1}'")]
- OutputStreamBuildError(String, #[source] cpal::BuildStreamError),
-
- #[error("selected card '{0}' was unable to play an output stream: '{1}'")]
- OutputStreamPlayError(String, #[source] cpal::PlayStreamError),
-}
projects / m17rt / commitdiff