audio playback kinda works

gui/src/imp/desktop.rs

@@ -1,13 +1,11 @@
 use crate::app::Command;
 use color_eyre::eyre::{eyre, Error};
 use cpal::traits::{DeviceTrait, HostTrait};
-use crossbeam_queue::ArrayQueue;
 use dioxus::hooks::{UnboundedReceiver, UnboundedSender};
 use futures::io::{AsyncRead, AsyncWrite};
 use mumble_protocol::control::{ClientControlCodec, ControlPacket};
 use mumble_protocol::Serverbound;
 use mumble_web2_common::GuiConfig;
-use std::collections::VecDeque;
 use std::net::ToSocketAddrs;
 use std::sync::Mutex;
 use std::{fmt, io, sync::Arc};
@@ -35,7 +33,7 @@ pub struct AudioSystem {
     input: cpal::Device,
 }
 
-const BUF_LEN: usize = 480; // 20 ms
+type Buffer = Arc<Mutex<dasp_ring_buffer::Bounded<Vec<i16>>>>;
 
 impl AudioSystem {
     pub fn new() -> Result<Self, Error> {
@@ -58,19 +56,35 @@ impl AudioSystem {
     }
 
     pub fn create_player(&mut self) -> Result<AudioPlayer, Error> {
-        let queue = Arc::new(ArrayQueue::<[i16; BUF_LEN]>::new(10));
+        let buffer = Arc::new(Mutex::new(dasp_ring_buffer::Bounded::from_raw_parts(
+            0,
+            0,
+            vec![
+            0;
+            2400 // 50ms of buffer
+        ],
+        )));
         let decoder = opus::Decoder::new(48_000, opus::Channels::Mono)?;
         let stream = {
-            let queue = queue.clone();
+            let buffer = buffer.clone();
             self.output.build_output_stream(
                 &cpal::StreamConfig {
                     channels: 1,
                     sample_rate: cpal::SampleRate(48_000),
-                    buffer_size: cpal::BufferSize::Fixed(BUF_LEN as u32), // 20ms playback delay
+                    buffer_size: cpal::BufferSize::Fixed(480), // 10ms playback delay
                 },
-                move |out, info| match queue.pop() {
-                    Some(buf) => out.copy_from_slice(&buf[..]),
-                    None => out.fill(0),
+                move |frame, info| {
+                    let mut buffer = buffer.lock().unwrap();
+                    for x in frame.iter_mut() {
+                        match buffer.pop() {
+                            Some(y) => {
+                                *x = y;
+                            }
+                            None => {
+                                *x = 0;
+                            }
+                        }
+                    }
                 },
                 move |err| error!("could not create output stream {err:?}"),
                 None,
@@ -79,9 +93,8 @@ impl AudioSystem {
         Ok(AudioPlayer {
             decoder,
             stream,
-            queue,
+            buffer,
             tmp: vec![0; 2400],
-            pos: 0,
         })
     }
 }
@@ -89,32 +102,31 @@ impl AudioSystem {
 pub struct AudioPlayer {
     decoder: opus::Decoder,
     stream: cpal::Stream,
-    queue: Arc<ArrayQueue<[i16; BUF_LEN]>>,
+    buffer: Buffer,
     tmp: Vec<i16>,
-    pos: usize,
 }
 
 impl AudioPlayer {
     pub fn play_opus(&mut self, payload: &[u8]) {
-        match self
-            .decoder
-            .decode(payload, &mut self.tmp[self.pos..], false)
-        {
-            Ok(l) => {
-                self.pos += l;
-            }
+        let len = loop {
+            match self.decoder.decode(payload, &mut self.tmp, false) {
+                Ok(l) => break l,
                 Err(e) => {
                     error!("opus decode error {e:?}");
+                    return;
+                }
             }
         };
-        while self.pos >= BUF_LEN {
-            let mut chunk = [0; BUF_LEN];
-            chunk.copy_from_slice(&self.tmp[..BUF_LEN]);
-            dbg!(&chunk);
-            let _ = self.queue.push(chunk);
-            let i = std::cell::Cell::new(0usize);
-            self.tmp.retain(|_| i.replace(i.get() + 1) >= BUF_LEN);
-            self.pos -= BUF_LEN;
+
+        let mut buffer = self.buffer.lock().unwrap();
+        let mut overrun = 0;
+        for x in &self.tmp[..len] {
+            if let Some(_) = buffer.push(*x) {
+                overrun += 1;
+            }
+        }
+        if overrun > 0 {
+            warn!("playback overrun by {overrun} samples");
         }
     }
 }