code.octet-stream.net Git - m17rt/blob - m17codec2/src/lib.rs

   1 use codec2::{Codec2, Codec2Mode};
   2 use cpal::traits::DeviceTrait;
   3 use cpal::traits::HostTrait;
   4 use cpal::traits::StreamTrait;
   5 use cpal::{Sample, SampleFormat, SampleRate};
   6 use log::debug;
   7 use m17app::adapter::StreamAdapter;
   8 use m17app::app::TxHandle;
   9 use m17app::link_setup::LinkSetup;
  10 use m17app::link_setup::M17Address;
  11 use m17core::address::Address;
  12 use m17core::address::Callsign;
  13 use m17core::protocol::LsfFrame;
  14 use m17core::protocol::StreamFrame;
  15 use std::collections::VecDeque;
  16 use std::fs::File;
  17 use std::io::Write;
  18 use std::path::Path;
  19 use std::path::PathBuf;
  20 use std::sync::{
  21     mpsc::{channel, Receiver, Sender},
  22     Arc, Mutex,
  23 };
  24 use std::time::Duration;
  25 use std::time::Instant;
  26
  27 pub fn decode_codec2<P: AsRef<Path>>(data: &[u8], out_path: P) -> Vec<i16> {
  28     let codec2 = Codec2::new(Codec2Mode::MODE_3200);
  29     let var_name = codec2;
  30     let mut codec = var_name;
  31     let mut all_samples: Vec<i16> = vec![];
  32     for i in 0..(data.len() / 8) {
  33         let mut samples = vec![0; codec.samples_per_frame()];
  34         codec.decode(&mut samples, &data[i * 8..((i + 1) * 8)]);
  35         all_samples.append(&mut samples);
  36     }
  37
  38     // dude this works
  39     let mut speech_out = File::create(out_path).unwrap();
  40     for b in &all_samples {
  41         speech_out.write_all(&b.to_le_bytes()).unwrap();
  42     }
  43     all_samples
  44 }
  45
  46 pub struct Codec2Adapter {
  47     state: Arc<Mutex<AdapterState>>,
  48     // TODO: make this configurable
  49     output_card: String,
  50 }
  51
  52 impl Codec2Adapter {
  53     pub fn new() -> Self {
  54         Self {
  55             state: Arc::new(Mutex::new(AdapterState {
  56                 tx: None,
  57                 out_buf: VecDeque::new(),
  58                 codec2: Codec2::new(Codec2Mode::MODE_3200),
  59                 end_tx: None,
  60             })),
  61             // TODO: this doesn't work on rpi. Use default_output_device() by default
  62             output_card: "default".to_owned(),
  63         }
  64     }
  65 }
  66
  67 struct AdapterState {
  68     tx: Option<TxHandle>,
  69     /// Circular buffer of output samples for playback
  70     out_buf: VecDeque<i16>,
  71     codec2: Codec2,
  72     end_tx: Option<Sender<()>>,
  73 }
  74
  75 impl StreamAdapter for Codec2Adapter {
  76     fn adapter_registered(&self, _id: usize, handle: TxHandle) {
  77         self.state.lock().unwrap().tx = Some(handle);
  78
  79         let (end_tx, end_rx) = channel();
  80         let state = self.state.clone();
  81         let output_card = self.output_card.clone();
  82         std::thread::spawn(move || stream_thread(end_rx, state, output_card));
  83         self.state.lock().unwrap().end_tx = Some(end_tx);
  84     }
  85
  86     fn adapter_removed(&self) {
  87         let mut state = self.state.lock().unwrap();
  88         state.tx = None;
  89         state.end_tx = None;
  90     }
  91
  92     fn tnc_started(&self) {}
  93
  94     fn tnc_closed(&self) {}
  95
  96     fn stream_began(&self, _link_setup: LinkSetup) {
  97         // for now we will assume:
  98         // - unencrypted
  99         // - data type is Voice (Codec2 3200), not Voice+Data
 100         // TODO: is encryption handled here or in M17App, such that we get a decrypted stream?
 101         // TODO: handle the Voice+Data combination with Codec2 1600
 102         self.state.lock().unwrap().codec2 = Codec2::new(Codec2Mode::MODE_3200);
 103     }
 104
 105     fn stream_data(&self, _frame_number: u16, _is_final: bool, data: Arc<[u8; 16]>) {
 106         let mut state = self.state.lock().unwrap();
 107         for encoded in data.chunks(8) {
 108             if state.out_buf.len() < 1024 {
 109                 let mut samples = [i16::EQUILIBRIUM; 160]; // while assuming 3200
 110                 state.codec2.decode(&mut samples, encoded);
 111                 // TODO: maybe get rid of VecDeque so we can decode directly into ring buffer?
 112                 for s in samples {
 113                     state.out_buf.push_back(s);
 114                 }
 115             } else {
 116                 debug!("out_buf overflow");
 117             }
 118         }
 119     }
 120 }
 121
 122 fn output_cb(data: &mut [i16], state: &Mutex<AdapterState>) {
 123     let mut state = state.lock().unwrap();
 124     for d in data {
 125         *d = state.out_buf.pop_front().unwrap_or(i16::EQUILIBRIUM);
 126     }
 127 }
 128
 129 /// Create and manage the stream from a dedicated thread since it's `!Send`
 130 fn stream_thread(end: Receiver<()>, state: Arc<Mutex<AdapterState>>, output_card: String) {
 131     let host = cpal::default_host();
 132     let device = host
 133         .output_devices()
 134         .unwrap()
 135         .find(|d| d.name().unwrap() == output_card)
 136         .unwrap();
 137     let mut configs = device.supported_output_configs().unwrap();
 138     // TODO: channels == 1 doesn't work on a Raspberry Pi
 139     // make this configurable and support interleaving LRLR stereo samples if using 2 channels
 140     let config = configs
 141         .find(|c| c.channels() == 1 && c.sample_format() == SampleFormat::I16)
 142         .unwrap()
 143         .with_sample_rate(SampleRate(8000));
 144     let stream = device
 145         .build_output_stream(
 146             &config.into(),
 147             move |data: &mut [i16], _info: &cpal::OutputCallbackInfo| {
 148                 output_cb(data, &state);
 149             },
 150             |e| {
 151                 // trigger end_tx here? always more edge cases
 152                 debug!("error occurred in codec2 playback: {e:?}");
 153             },
 154             None,
 155         )
 156         .unwrap();
 157     stream.play().unwrap();
 158     let _ = end.recv();
 159     // it seems concrete impls of Stream have a Drop implementation that will handle termination
 160 }
 161
 162 pub struct WavePlayer;
 163
 164 impl WavePlayer {
 165     pub fn play(
 166         path: PathBuf,
 167         tx: TxHandle,
 168         source: &M17Address,
 169         destination: &M17Address,
 170         channel_access_number: u8,
 171     ) {
 172         let mut reader = hound::WavReader::open(path).unwrap();
 173         let mut samples = reader.samples::<i16>();
 174
 175         let mut codec = Codec2::new(Codec2Mode::MODE_3200);
 176         let mut in_buf = [0i16; 160];
 177         let mut out_buf = [0u8; 16];
 178         let mut lsf_chunk: usize = 0;
 179         const TICK: Duration = Duration::from_millis(40);
 180         let mut next_tick = Instant::now() + TICK;
 181         let mut frame_number = 0;
 182
 183         let mut setup = LinkSetup::new_voice(source, destination);
 184         setup.set_channel_access_number(channel_access_number);
 185         tx.transmit_stream_start(&setup);
 186
 187         loop {
 188             let mut last_one = false;
 189             for mut out in out_buf.chunks_mut(8) {
 190                 for i in 0..160 {
 191                     let sample = match samples.next() {
 192                         Some(Ok(sample)) => sample,
 193                         _ => {
 194                             last_one = true;
 195                             0
 196                         }
 197                     };
 198                     in_buf[i] = sample;
 199                 }
 200                 codec.encode(&mut out, &in_buf);
 201             }
 202             tx.transmit_stream_next(&StreamFrame {
 203                 lich_idx: lsf_chunk as u8,
 204                 lich_part: setup.lich_part(lsf_chunk as u8),
 205                 frame_number,
 206                 end_of_stream: last_one,
 207                 stream_data: out_buf.clone(),
 208             });
 209             frame_number += 1;
 210             lsf_chunk = (lsf_chunk + 1) % 6;
 211
 212             if last_one {
 213                 break;
 214             }
 215
 216             std::thread::sleep(next_tick.duration_since(Instant::now()));
 217             next_tick += TICK;
 218         }
 219     }
 220 }