gui/Cargo.toml

@@ -146,7 +146,6 @@ desktop = [
   "rfd/xdg-portal",
   "etcetera",
 ]
-
 mobile = [
   "dioxus/mobile",
   "tokio",

gui/src/app.rs

@@ -6,7 +6,7 @@ use mumble_web2_common::{ClientConfig, ServerStatus};
 use ordermap::OrderSet;
 use std::collections::{HashMap, HashSet};
 
-use crate::imp;
+use crate::imp::{Platform, PlatformInterface as _};
 
 pub type ChannelId = u32;
 pub type UserId = u32;
@@ -690,12 +690,12 @@ pub fn LoginView(config: Resource<ClientConfig>) -> Element {
     use_resource(move || async move {
         let client = reqwest::Client::new();
         loop {
-            *last_status.write_unchecked() = Some(imp::get_status(&client).await);
-            imp::sleep(std::time::Duration::from_secs_f32(1.0)).await;
+            *last_status.write_unchecked() = Some(Platform::get_status(&client).await);
+            Platform::sleep(std::time::Duration::from_secs_f32(1.0)).await;
         }
     });
 
-    let mut address_input = use_signal(|| imp::load_server_url());
+    let mut address_input = use_signal(|| Platform::load_server_url());
     let address = use_memo(move || {
         if let Some(addr) = address_input() {
             addr.clone()
@@ -706,14 +706,14 @@ pub fn LoginView(config: Resource<ClientConfig>) -> Element {
         }
     });
 
-    let previous_username = imp::load_username();
+    let previous_username = Platform::load_username();
     let mut username = use_signal(|| previous_username.unwrap_or(String::new()));
 
     let do_connect = move |_| {
         //let _ = set_default_username(&username.read());
-        let _ = imp::set_default_username(&username.read());
+        let _ = Platform::set_default_username(&username.read());
         if config.read().as_ref().is_some_and(|cfg| cfg.any_server) {
-            imp::set_default_server(&address.read());
+            Platform::set_default_server(&address.read());
         }
         net.send(Connect {
             address: address.read().clone(),
@@ -860,13 +860,13 @@ pub fn app() -> Element {
 
     use_coroutine(|rx: UnboundedReceiver<Command>| super::network_entrypoint(rx));
     let config = use_resource(|| async move {
-        match imp::load_config().await {
+        match Platform::load_config().await {
             Ok(config) => config,
             Err(_) => ClientConfig::default(),
         }
     });
 
-    imp::request_permissions();
+    Platform::request_permissions();
 
     rsx!(
         document::Link{ rel: "stylesheet", href: "https://fonts.googleapis.com/css2?family=Nunito:ital,wght@0,200..1000;1,200..1000&display=swap" }

gui/src/effects.rs

@@ -7,7 +7,7 @@ use std::cell::RefCell;
 use std::sync::Arc;
 use tracing::{error, info};
 
-use crate::imp;
+use crate::imp::SpawnHandle;
 
 static DF_MODEL: Asset = asset!("/assets/DeepFilterNet3_ll_onnx.tar.gz");
 // TODO: make this user configurable.
@@ -32,10 +32,7 @@ enum DenoisingModelState {
     Availible(Box<DfTract>),
 }
 
-fn with_denoising_model<O>(
-    spawn: &imp::SpawnHandle,
-    func: impl FnOnce(&mut DfTract) -> O,
-) -> Option<O> {
+fn with_denoising_model<O>(spawn: &SpawnHandle, func: impl FnOnce(&mut DfTract) -> O) -> Option<O> {
     // Using a thread local is super gross, but DfTract is not Send (so it can never leave the current
     // thread) while AudioProcessing itself might change threads whenever.
     thread_local! {
@@ -89,7 +86,7 @@ fn with_denoising_model<O>(
 
 pub struct AudioProcessor {
     denoise: bool,
-    spawn: imp::SpawnHandle,
+    spawn: SpawnHandle,
     buffer: Vec<f32>,
     noise_floor: f32,
     /// Whether we were transmitting in the previous frame
@@ -102,7 +99,7 @@ impl AudioProcessor {
     pub fn new_plain() -> Self {
         AudioProcessor {
             denoise: false,
-            spawn: imp::SpawnHandle::current(),
+            spawn: SpawnHandle::current(),
             buffer: Vec::new(),
             noise_floor: DEFAULT_NOISE_FLOOR,
             was_transmitting: false,
@@ -113,7 +110,7 @@ impl AudioProcessor {
     pub fn new_denoising() -> Self {
         AudioProcessor {
             denoise: true,
-            spawn: imp::SpawnHandle::current(),
+            spawn: SpawnHandle::current(),
             buffer: Vec::new(),
             noise_floor: DEFAULT_NOISE_FLOOR,
             was_transmitting: false,
@@ -123,7 +120,12 @@ impl AudioProcessor {
 }
 
 impl AudioProcessor {
-    pub fn process(&mut self, audio: &[f32], channels: usize, output: &mut Vec<f32>) -> TransmitState {
+    pub fn process(
+        &mut self,
+        audio: &[f32],
+        channels: usize,
+        output: &mut Vec<f32>,
+    ) -> TransmitState {
         let mut include_raw = true;
         if self.denoise {
             with_denoising_model(&self.spawn, |df| {

gui/src/imp/connect.rs

@@ -108,3 +108,8 @@ pub async fn network_connect(
 pub async fn get_status(client: &reqwest::Client) -> color_eyre::Result<ServerStatus> {
     bail!("status not supported on desktop yet")
 }
+
+#[allow(unused)]
+pub use tokio::spawn;
+#[allow(unused)]
+pub type SpawnHandle = tokio::runtime::Handle;

gui/src/imp/desktop.rs

@@ -1,12 +1,83 @@
+use crate::app::Command;
+use color_eyre::eyre::Error;
+use dioxus::hooks::UnboundedReceiver;
 use etcetera::{choose_app_strategy, AppStrategy, AppStrategyArgs};
-use mumble_web2_common::ClientConfig;
+use mumble_web2_common::{ClientConfig, ServerStatus};
 use std::collections::HashMap;
-pub use tokio::runtime::Handle as SpawnHandle;
-pub use tokio::task::spawn;
-pub use tokio::time::sleep;
+use std::time::Duration;
 
-pub use super::connect::*;
-pub use super::native_audio::*;
+/// Desktop platform implementation using Tokio and native audio.
+pub struct DesktopPlatform;
+
+impl super::PlatformInterface for DesktopPlatform {
+    type AudioSystem = super::native_audio::NativeAudioSystem;
+
+    async fn sleep(duration: Duration) {
+        tokio::time::sleep(duration).await;
+    }
+
+    async fn load_config() -> color_eyre::Result<ClientConfig> {
+        Ok(ClientConfig {
+            proxy_url: None,
+            cert_hash: None,
+            any_server: true,
+        })
+    }
+
+    fn load_username() -> Option<String> {
+        let config = load_config_map();
+        config.get("username").cloned()
+    }
+
+    fn load_server_url() -> Option<String> {
+        let config = load_config_map();
+        config.get("server").cloned()
+    }
+
+    fn set_default_username(username: &str) -> Option<()> {
+        let mut config = load_config_map();
+        config.insert("username".to_string(), username.to_string());
+        save_config_map(&config).ok()
+    }
+
+    fn set_default_server(server: &str) -> Option<()> {
+        let mut config = load_config_map();
+        config.insert("server".to_string(), server.to_string());
+        save_config_map(&config).ok()
+    }
+
+    async fn network_connect(
+        address: String,
+        username: String,
+        event_rx: &mut UnboundedReceiver<Command>,
+        gui_config: &ClientConfig,
+    ) -> Result<(), Error> {
+        super::connect::network_connect(address, username, event_rx, gui_config).await
+    }
+
+    async fn get_status(client: &reqwest::Client) -> color_eyre::Result<ServerStatus> {
+        super::connect::get_status(client).await
+    }
+
+    fn init_logging() {
+        use tracing::level_filters::LevelFilter;
+        use tracing_subscriber::filter::EnvFilter;
+
+        let env_filter = EnvFilter::builder()
+            .with_default_directive(LevelFilter::INFO.into())
+            .from_env_lossy();
+
+        tracing_subscriber::fmt()
+            .with_target(true)
+            .with_level(true)
+            .with_env_filter(env_filter)
+            .init();
+    }
+
+    fn request_permissions() {
+        // No-op on desktop
+    }
+}
 
 fn get_config_path() -> std::path::PathBuf {
     let strategy = choose_app_strategy(AppStrategyArgs {
@@ -35,48 +106,3 @@ fn save_config_map(config: &HashMap<String, String>) -> color_eyre::Result<()> {
     std::fs::write(&config_path, contents)?;
     Ok(())
 }
-
-pub fn set_default_username(username: &str) -> Option<()> {
-    let mut config = load_config_map();
-    config.insert("username".to_string(), username.to_string());
-    save_config_map(&config).ok()
-}
-
-pub fn set_default_server(server: &str) -> Option<()> {
-    let mut config = load_config_map();
-    config.insert("server".to_string(), server.to_string());
-    save_config_map(&config).ok()
-}
-
-pub fn load_username() -> Option<String> {
-    let config = load_config_map();
-    config.get("username").cloned()
-}
-
-pub fn load_server_url() -> Option<String> {
-    let config = load_config_map();
-    config.get("server").cloned()
-}
-
-pub async fn load_config() -> color_eyre::Result<ClientConfig> {
-    Ok(ClientConfig {
-        proxy_url: None,
-        cert_hash: None,
-        any_server: true,
-    })
-}
-
-pub fn init_logging() {
-    use tracing::level_filters::LevelFilter;
-    use tracing_subscriber::filter::EnvFilter;
-
-    let env_filter = EnvFilter::builder()
-        .with_default_directive(LevelFilter::INFO.into())
-        .from_env_lossy();
-
-    tracing_subscriber::fmt()
-        .with_target(true)
-        .with_level(true)
-        .with_env_filter(env_filter)
-        .init();
-}

gui/src/imp/mobile.rs

@@ -1,61 +1,85 @@
-use android_permissions::{PermissionManager, RECORD_AUDIO};
-use jni::{objects::JObject, JavaVM};
-use mumble_web2_common::ClientConfig;
+use crate::app::Command;
+use color_eyre::eyre::Error;
+use dioxus::hooks::UnboundedReceiver;
+use mumble_web2_common::{ClientConfig, ServerStatus};
+use std::future::Future;
+use std::time::Duration;
 
-use std::collections::HashMap;
-pub use tokio::runtime::Handle as SpawnHandle;
-pub use tokio::task::spawn;
-pub use tokio::time::sleep;
+/// Mobile platform implementation using Tokio, native audio, and Android permissions.
+pub struct MobilePlatform;
 
-pub use super::connect::*;
-pub use super::native_audio::*;
+impl super::PlatformInterface for MobilePlatform {
+    type AudioSystem = super::native_audio::NativeAudioSystem;
 
-pub fn set_default_username(username: &str) -> Option<()> {
-    None
+    async fn load_config() -> color_eyre::Result<ClientConfig> {
+        Ok(ClientConfig {
+            proxy_url: None,
+            cert_hash: None,
+            any_server: true,
+        })
+    }
+
+    fn load_username() -> Option<String> {
+        None
+    }
+
+    fn load_server_url() -> Option<String> {
+        None
+    }
+
+    fn set_default_username(_username: &str) -> Option<()> {
+        None
+    }
+
+    fn set_default_server(server: &str) -> Option<()> {
+        None
+    }
+
+    async fn network_connect(
+        address: String,
+        username: String,
+        event_rx: &mut UnboundedReceiver<Command>,
+        gui_config: &ClientConfig,
+    ) -> Result<(), Error> {
+        super::connect::network_connect(address, username, event_rx, gui_config).await
+    }
+
+    async fn get_status(client: &reqwest::Client) -> color_eyre::Result<ServerStatus> {
+        super::connect::get_status(client).await
+    }
+
+    fn init_logging() {
+        use tracing::level_filters::LevelFilter;
+        use tracing_subscriber::filter::EnvFilter;
+
+        let env_filter = EnvFilter::builder()
+            .with_default_directive(LevelFilter::INFO.into())
+            .from_env_lossy();
+
+        tracing_subscriber::fmt()
+            .with_target(true)
+            .with_level(true)
+            .with_env_filter(env_filter)
+            .init();
+    }
+
+    fn request_permissions() {
+        request_recording_permission();
+    }
+
+    async fn sleep(duration: Duration) {
+        tokio::time::sleep(duration).await;
+    }
 }
 
-pub fn set_default_server(server: &str) -> Option<()> {
-    None
-}
-
-pub fn load_username() -> Option<String> {
-    None
-}
-
-pub fn load_server_url() -> Option<String> {
-    None
-}
-
-pub async fn load_config() -> color_eyre::Result<ClientConfig> {
-    Ok(ClientConfig {
-        proxy_url: None,
-        cert_hash: None,
-        any_server: true,
-    })
-}
-
-pub fn init_logging() {
-    use tracing::level_filters::LevelFilter;
-    use tracing_subscriber::filter::EnvFilter;
-
-    let env_filter = EnvFilter::builder()
-        .with_default_directive(LevelFilter::INFO.into())
-        .from_env_lossy();
-
-    tracing_subscriber::fmt()
-        .with_target(true)
-        .with_level(true)
-        .with_env_filter(env_filter)
-        .init();
-}
-
-#[cfg(feature = "mobile")]
-pub fn request_permissions() {
-    request_recording_permission();
-}
+#[cfg(not(target_os = "android"))]
+pub fn request_recording_permission() {}
 
 #[cfg(target_os = "android")]
 pub fn request_recording_permission() {
+    use android_permissions::{PermissionManager, RECORD_AUDIO};
+    use jni::{objects::JObject, JavaVM};
+
     let ctx = ndk_context::android_context();
     let vm = unsafe { JavaVM::from_raw(ctx.vm().cast()).unwrap() };
     let activity = unsafe { JObject::from_raw(ctx.context().cast()) };

gui/src/imp/mod.rs

@@ -1,29 +1,166 @@
-#[cfg(feature = "web")]
-mod web;
+//! Platform abstraction layer
+//!
+//! This module defines traits that each platform (web, desktop, mobile) must implement.
+//! The traits make the platform boundary explicit and provide compile-time verification.
+#![allow(async_fn_in_trait)]
+
+use crate::{app::Command, effects::AudioProcessor};
+use color_eyre::eyre::Error;
+use dioxus::hooks::UnboundedReceiver;
+use mumble_web2_common::{ClientConfig, ServerStatus};
+use std::future::Future;
+use std::time::Duration;
+
+// ============================================================================
+// Trait Definitions
+// ============================================================================
+
+/// Platform-specific audio subsystem for capturing microphone input and creating playback streams.
+///
+/// The audio system handles Opus encoding internally - callers receive encoded frames
+/// ready for network transmission.
+pub trait AudioSystemInterface: Sized {
+    /// The player type returned by [`create_player`](Self::create_player).
+    type AudioPlayer: AudioPlayerInterface;
+
+    /// Initialize the audio system.
+    async fn new() -> Result<Self, Error>;
+
+    /// Set the processor for the microphone input, mainly noise cancellation settings.
+    fn set_processor(&self, processor: AudioProcessor);
+
+    /// Begin listening to microphone input, calling the `each` function with
+    /// encoded opus frames.
+    fn start_recording(
+        &mut self,
+        each: impl FnMut(Vec<u8>, bool) + Send + 'static,
+    ) -> Result<(), Error>;
+
+    /// Begin playback of an audio stream, returning an object that can be passed  opus frames.
+    fn create_player(&mut self) -> Result<Self::AudioPlayer, Error>;
+}
+
+/// A handle to an active audio playback stream for a single remote user.
+///
+/// Each connected user gets their own `AudioPlayer` instance, which decodes
+/// incoming Opus frames and outputs PCM audio to the platform's audio device.
+/// The player manages its own decoder state and output buffer.
+pub trait AudioPlayerInterface {
+    /// Decode and play an Opus-encoded audio frame.
+    fn play_opus(&mut self, payload: &[u8]);
+}
+
+/// This is the main trait that each platform must implement. It combines all
+/// platform-specific functionality into a single interface, providing compile-time
+/// verification that all platforms implement the required functionality.
+pub trait PlatformInterface {
+    type AudioSystem: AudioSystemInterface;
+
+    /// Initialize logging for the platform.
+    fn init_logging();
+
+    /// Request runtime permissions (Android audio recording, etc.).
+    fn request_permissions();
+
+    /// Establish a connection to the Mumble server and run the network loop.
+    fn network_connect(
+        address: String,
+        username: String,
+        event_rx: &mut UnboundedReceiver<Command>,
+        gui_config: &ClientConfig,
+    ) -> impl Future<Output = Result<(), Error>>;
+
+    /// Get server status (user count, version, etc.).
+    fn get_status(
+        client: &reqwest::Client,
+    ) -> impl Future<Output = color_eyre::Result<ServerStatus>>;
+
+    /// Load the proxy overrides (proxy URL, cert hash, etc.).
+    fn load_config() -> impl Future<Output = color_eyre::Result<ClientConfig>>;
+
+    /// Load saved username.
+    fn load_username() -> Option<String>;
+
+    /// Load saved server URL.
+    fn load_server_url() -> Option<String>;
+
+    /// Save the default username.
+    fn set_default_username(username: &str) -> Option<()>;
+
+    /// Save the default server URL.
+    fn set_default_server(server: &str) -> Option<()>;
+
+    /// Async sleep for the given duration.
+    fn sleep(duration: Duration) -> impl Future<Output = ()>;
+}
+
+// ============================================================================
+// Platform Modules
+// ============================================================================
 
 #[cfg(any(feature = "desktop", feature = "mobile"))]
 mod connect;
-#[cfg(any(feature = "desktop", feature = "mobile"))]
-mod native_audio;
-
 #[cfg(feature = "desktop")]
 mod desktop;
 #[cfg(feature = "mobile")]
 mod mobile;
+#[cfg(any(feature = "desktop", feature = "mobile"))]
+mod native_audio;
+mod stub;
+#[cfg(feature = "web")]
+mod web;
 
-#[cfg(feature = "desktop")]
-pub use desktop::*;
-#[cfg(feature = "mobile")]
-pub use mobile::*;
+// ============================================================================
+// Platform Type Alias
+// ============================================================================
 
-#[cfg(feature = "mobile")]
-pub use mobile::request_permissions;
+#[cfg(feature = "web")]
+pub type Platform = web::WebPlatform;
 
-#[cfg(any(feature = "desktop", feature = "web"))]
-pub fn request_permissions() {}
+#[cfg(all(feature = "desktop", not(feature = "web")))]
+pub type Platform = desktop::DesktopPlatform;
 
-#[cfg(all(feature = "web", not(any(feature = "desktop", feature = "mobile"))))]
-pub use web::*;
+#[cfg(all(feature = "mobile", not(feature = "web"), not(feature = "desktop")))]
+pub type Platform = mobile::MobilePlatform;
 
-#[cfg(any(feature = "desktop"))]
-pub use desktop::*;
+#[cfg(all(
+    not(feature = "mobile"),
+    not(feature = "web"),
+    not(feature = "desktop")
+))]
+pub type Platform = stub::StubPlatform;
+
+pub type AudioSystem = <Platform as PlatformInterface>::AudioSystem;
+pub type AudioPlayer = <AudioSystem as AudioSystemInterface>::AudioPlayer;
+
+// ========================
+// Platform Async Runtime
+// ========================
+
+// Note: these can not be part of the Platform because they differ in Send requiremets
+#[cfg(all(any(feature = "desktop", feature = "mobile"), not(feature = "web")))]
+pub use connect::{spawn, SpawnHandle};
+#[cfg(all(
+    not(feature = "desktop"),
+    not(feature = "mobile"),
+    not(feature = "web")
+))]
+pub use stub::{spawn, SpawnHandle};
+#[cfg(feature = "web")]
+pub use web::{spawn, SpawnHandle};
+
+// =======================
+// Compile-time Assertions
+// =======================
+const _: () = {
+    fn assert_platform<T: PlatformInterface>() {}
+
+    // Check each implementation, and prevent warnings that the implementations are unused.
+    #[cfg(feature = "web")]
+    let _ = assert_platform::<web::WebPlatform>;
+    #[cfg(feature = "desktop")]
+    let _ = assert_platform::<desktop::DesktopPlatform>;
+    #[cfg(feature = "mobile")]
+    let _ = assert_platform::<mobile::MobilePlatform>;
+    let _ = assert_platform::<stub::StubPlatform>;
+};

gui/src/imp/native_audio.rs

@@ -1,19 +1,12 @@
 use crate::effects::{AudioProcessor, AudioProcessorSender, TransmitState};
 use color_eyre::eyre::{eyre, Error};
 use cpal::traits::{DeviceTrait, HostTrait, StreamTrait as _};
-use futures::io::{AsyncRead, AsyncWrite};
 use std::mem::replace;
 use std::sync::Arc;
 use std::sync::Mutex;
 use tracing::{error, info, warn};
 
-pub trait ImpRead: AsyncRead + Unpin + Send + 'static {}
-impl<T: AsyncRead + Unpin + Send + 'static> ImpRead for T {}
-
-pub trait ImpWrite: AsyncWrite + Unpin + Send + 'static {}
-impl<T: AsyncWrite + Unpin + Send + 'static> ImpWrite for T {}
-
-pub struct AudioSystem {
+pub struct NativeAudioSystem {
     output: cpal::Device,
     input: cpal::Device,
     processors: AudioProcessorSender,
@@ -52,28 +45,7 @@ fn encode_and_send(
 
 type Buffer = Arc<Mutex<dasp_ring_buffer::Bounded<Vec<i16>>>>;
 
-impl AudioSystem {
-    pub async fn new() -> Result<Self, Error> {
-        // TODO
-        let host = cpal::default_host();
-        let name = host.id();
-        let processors = AudioProcessorSender::default();
-        Ok(AudioSystem {
-            output: host
-                .default_output_device()
-                .ok_or(eyre!("no output devices from {name:?}"))?,
-            input: host
-                .default_input_device()
-                .ok_or(eyre!("no input devices from {name:?}"))?,
-            processors,
-            recording_stream: None,
-        })
-    }
-
-    pub fn set_processor(&self, processor: AudioProcessor) {
-        self.processors.store(Some(processor))
-    }
-
+impl NativeAudioSystem {
     fn choose_config(
         &self,
         configs: impl Iterator<Item = cpal::SupportedStreamConfigRange>,
@@ -103,8 +75,32 @@ impl AudioSystem {
             .cloned()
             .ok_or(eyre!("no supported stream configs"))
     }
+}
 
-    pub fn start_recording(
+impl super::AudioSystemInterface for NativeAudioSystem {
+    type AudioPlayer = NativeAudioPlayer;
+
+    async fn new() -> Result<Self, Error> {
+        let host = cpal::default_host();
+        let name = host.id();
+        let processors = AudioProcessorSender::default();
+        Ok(NativeAudioSystem {
+            output: host
+                .default_output_device()
+                .ok_or(eyre!("no output devices from {name:?}"))?,
+            input: host
+                .default_input_device()
+                .ok_or(eyre!("no input devices from {name:?}"))?,
+            processors,
+            recording_stream: None,
+        })
+    }
+
+    fn set_processor(&self, processor: AudioProcessor) {
+        self.processors.store(Some(processor))
+    }
+
+    fn start_recording(
         &mut self,
         mut each: impl FnMut(Vec<u8>, bool) + Send + 'static,
     ) -> Result<(), Error> {
@@ -124,7 +120,8 @@ impl AudioSystem {
             if let Some(new_processor) = processors.take() {
                 current_processor = new_processor;
             }
-            let state = current_processor.process(frame, config.channels as usize, &mut output_buffer);
+            let state =
+                current_processor.process(frame, config.channels as usize, &mut output_buffer);
             encode_and_send(state, &mut output_buffer, &mut encoder, &mut each);
         };
 
@@ -144,7 +141,7 @@ impl AudioSystem {
         }
     }
 
-    pub fn create_player(&mut self) -> Result<AudioPlayer, Error> {
+    fn create_player(&mut self) -> Result<NativeAudioPlayer, Error> {
         let config = self.choose_config(self.output.supported_output_configs()?)?;
         info!(
             "creating player on {:?} with {:#?}",
@@ -182,7 +179,7 @@ impl AudioSystem {
             )?
         };
         stream.play()?;
-        Ok(AudioPlayer {
+        Ok(NativeAudioPlayer {
             decoder,
             stream,
             buffer,
@@ -191,15 +188,15 @@ impl AudioSystem {
     }
 }
 
-pub struct AudioPlayer {
+pub struct NativeAudioPlayer {
     decoder: opus::Decoder,
     stream: cpal::Stream,
     buffer: Buffer,
     tmp: Vec<i16>,
 }
 
-impl AudioPlayer {
-    pub fn play_opus(&mut self, payload: &[u8]) {
+impl super::AudioPlayerInterface for NativeAudioPlayer {
+    fn play_opus(&mut self, payload: &[u8]) {
         let len = match self.decoder.decode(payload, &mut self.tmp, false) {
             Ok(l) => l,
             Err(e) => {

gui/src/imp/stub.rs

@@ -0,0 +1,119 @@
+/// Stub implementation of the platform interface, so that we can
+/// `cargo check` without any --feature flags.
+use crate::effects::AudioProcessor;
+use color_eyre::eyre::Error;
+use dioxus::hooks::UnboundedReceiver;
+use mumble_web2_common::{ClientConfig, ServerStatus};
+use std::future::Future;
+
+pub struct StubPlatform;
+
+impl super::PlatformInterface for StubPlatform {
+    type AudioSystem = StubAudioSystem;
+
+    fn init_logging() {
+        panic!("stubbed platform")
+    }
+
+    fn request_permissions() {
+        panic!("stubbed platform")
+    }
+
+    fn network_connect(
+        _address: String,
+        _username: String,
+        _event_rx: &mut UnboundedReceiver<crate::app::Command>,
+        _gui_config: &ClientConfig,
+    ) -> impl Future<Output = Result<(), Error>> {
+        async { panic!("stubbed platform") }
+    }
+
+    fn get_status(
+        _client: &reqwest::Client,
+    ) -> impl Future<Output = color_eyre::Result<ServerStatus>> {
+        async { panic!("stubbed platform") }
+    }
+
+    fn load_config() -> impl Future<Output = color_eyre::Result<ClientConfig>> {
+        async { panic!("stubbed platform") }
+    }
+
+    fn load_username() -> Option<String> {
+        panic!("stubbed platform")
+    }
+
+    fn load_server_url() -> Option<String> {
+        panic!("stubbed platform")
+    }
+
+    fn set_default_username(_username: &str) -> Option<()> {
+        panic!("stubbed platform")
+    }
+
+    fn set_default_server(_server: &str) -> Option<()> {
+        panic!("stubbed platform")
+    }
+
+    fn sleep(_duration: std::time::Duration) -> impl Future<Output = ()> {
+        async { panic!("stubbed platform") }
+    }
+}
+
+pub struct StubAudioSystem;
+
+impl super::AudioSystemInterface for StubAudioSystem {
+    type AudioPlayer = StubAudioPlayer;
+
+    async fn new() -> Result<Self, Error> {
+        panic!("stubbed platform")
+    }
+
+    fn set_processor(&self, _processor: AudioProcessor) {
+        panic!("stubbed platform")
+    }
+
+    fn start_recording(
+        &mut self,
+        _each: impl FnMut(Vec<u8>, bool) + Send + 'static,
+    ) -> Result<(), Error> {
+        panic!("stubbed platform")
+    }
+
+    fn create_player(&mut self) -> Result<Self::AudioPlayer, Error> {
+        panic!("stubbed platform")
+    }
+}
+
+pub struct StubAudioPlayer;
+
+impl super::AudioPlayerInterface for StubAudioPlayer {
+    fn play_opus(&mut self, _payload: &[u8]) {
+        panic!("stubbed platform")
+    }
+}
+
+#[allow(unused)]
+pub struct SpawnHandle;
+
+impl SpawnHandle {
+    #[allow(unused)]
+    pub fn spawn<F>(&self, _future: F)
+    where
+        F: Future<Output = ()> + 'static,
+    {
+        panic!("stubbed platform")
+    }
+
+    #[allow(unused)]
+    pub fn current() -> Self {
+        SpawnHandle
+    }
+}
+
+#[allow(unused)]
+pub fn spawn<F>(_future: F)
+where
+    F: Future<Output = ()> + 'static,
+{
+    panic!("stubbed platform")
+}

gui/src/imp/web.rs

@@ -3,7 +3,6 @@ use crate::effects::{AudioProcessor, AudioProcessorSender, TransmitState};
 use color_eyre::eyre::{bail, eyre, Error};
 use crossbeam::atomic::AtomicCell;
 use dioxus::prelude::*;
-use futures::{AsyncRead, AsyncWrite};
 use gloo_timers::future::TimeoutFuture;
 use js_sys::Float32Array;
 use mumble_protocol::control::ClientControlCodec;
@@ -29,7 +28,6 @@ use web_sys::AudioWorkletNode;
 use web_sys::EncodedAudioChunk;
 use web_sys::EncodedAudioChunkInit;
 use web_sys::EncodedAudioChunkType;
-use web_sys::MediaStream;
 use web_sys::MediaStreamConstraints;
 use web_sys::MessageEvent;
 use web_sys::WebTransport;
@@ -39,16 +37,119 @@ use web_sys::WorkletOptions;
 use web_sys::{console, window};
 use web_sys::{AudioContext, AudioDataCopyToOptions};
 
+#[allow(unused)]
 pub use wasm_bindgen_futures::spawn_local as spawn;
 
-pub trait ImpRead: AsyncRead + Unpin + 'static {}
-impl<T: AsyncRead + Unpin + 'static> ImpRead for T {}
+#[allow(unused)]
+#[derive(Clone)]
+pub struct SpawnHandle;
 
-pub trait ImpWrite: AsyncWrite + Unpin + 'static {}
-impl<T: AsyncWrite + Unpin + 'static> ImpWrite for T {}
+impl SpawnHandle {
+    pub fn spawn<F>(&self, future: F)
+    where
+        F: Future<Output = ()> + 'static,
+    {
+        wasm_bindgen_futures::spawn_local(future);
+    }
 
-pub async fn sleep(d: Duration) {
-    TimeoutFuture::new(d.as_millis() as u32).await
+    pub fn current() -> Self {
+        SpawnHandle
+    }
+}
+
+/// Web platform implementation using WebTransport and Web Audio API.
+pub struct WebPlatform;
+
+impl super::PlatformInterface for WebPlatform {
+    type AudioSystem = WebAudioSystem;
+
+    fn init_logging() {
+        // copied from tracing_web example usage
+
+        use tracing_subscriber::fmt::format::Pretty;
+        use tracing_subscriber::prelude::*;
+        use tracing_web::{performance_layer, MakeWebConsoleWriter};
+
+        let fmt_layer = tracing_subscriber::fmt::layer()
+            .with_ansi(false) // Only partially supported across browsers
+            .without_time() // std::time is not available in browsers
+            .with_writer(MakeWebConsoleWriter::new()) // write events to the console
+            .with_filter(LevelFilter::DEBUG);
+        let perf_layer = performance_layer().with_details_from_fields(Pretty::default());
+
+        tracing_subscriber::registry()
+            .with(fmt_layer)
+            .with(perf_layer)
+            .init();
+
+        info!("logging initiated");
+    }
+
+    fn request_permissions() {
+        // No-op on web
+    }
+
+    async fn load_config() -> color_eyre::Result<ClientConfig> {
+        let config_url = match option_env!("MUMBLE_WEB2_GUI_CONFIG_URL") {
+            Some(url) => Url::parse(url)?,
+            None => absolute_url("config")?,
+        };
+        info!("loading config from {}", config_url);
+
+        let config = reqwest::get(config_url)
+            .await?
+            .json::<ClientConfig>()
+            .await?;
+
+        Ok(config)
+    }
+
+    fn load_username() -> Option<String> {
+        web_sys::window()
+            .unwrap()
+            .local_storage()
+            .ok()??
+            .get_item("username")
+            .ok()?
+    }
+
+    fn load_server_url() -> Option<String> {
+        None
+    }
+
+    fn set_default_username(username: &str) -> Option<()> {
+        web_sys::window()?
+            .local_storage()
+            .ok()??
+            .set_item("username", username)
+            .ok()
+    }
+
+    fn set_default_server(_server: &str) -> Option<()> {
+        None
+    }
+
+    async fn network_connect(
+        address: String,
+        username: String,
+        event_rx: &mut UnboundedReceiver<Command>,
+        gui_config: &ClientConfig,
+    ) -> Result<(), Error> {
+        network_connect(address, username, event_rx, gui_config).await
+    }
+
+    async fn get_status(client: &reqwest::Client) -> color_eyre::Result<ServerStatus> {
+        Ok(client
+            .get(absolute_url("status")?)
+            .send()
+            .await?
+            .json::<ServerStatus>()
+            .await?)
+    }
+
+    async fn sleep(duration: Duration) {
+        TimeoutFuture::new(duration.as_millis() as u32).await;
+    }
 }
 
 trait ResultExt<T> {
@@ -73,7 +174,7 @@ impl<T> ResultExt<T> for Result<T, JsError> {
     }
 }
 
-pub struct AudioSystem {
+pub struct WebAudioSystem {
     webctx: AudioContext,
     processors: AudioProcessorSender,
 }
@@ -104,8 +205,10 @@ async fn attach_worklet(audio_context: &AudioContext) -> Result<(), Error> {
     Ok(())
 }
 
-impl AudioSystem {
-    pub async fn new() -> Result<Self, Error> {
+impl super::AudioSystemInterface for WebAudioSystem {
+    type AudioPlayer = WebAudioPlayer;
+
+    async fn new() -> Result<Self, Error> {
         // Create MediaStreams to playback decoded audio
         // The audio context is used to reproduce audio.
         let webctx = configure_audio_context();
@@ -113,17 +216,14 @@ impl AudioSystem {
 
         let processors = AudioProcessorSender::default();
 
-        Ok(AudioSystem { webctx, processors })
+        Ok(WebAudioSystem { webctx, processors })
     }
 
-    pub fn set_processor(&self, processor: AudioProcessor) {
+    fn set_processor(&self, processor: AudioProcessor) {
         self.processors.store(Some(processor))
     }
 
-    pub fn start_recording(
-        &mut self,
-        each: impl FnMut(Vec<u8>, bool) + 'static,
-    ) -> Result<(), Error> {
+    fn start_recording(&mut self, each: impl FnMut(Vec<u8>, bool) + 'static) -> Result<(), Error> {
         let audio_context_worklet = self.webctx.clone();
         let processors = self.processors.clone();
         spawn(async move {
@@ -135,7 +235,7 @@ impl AudioSystem {
         Ok(())
     }
 
-    pub fn create_player(&mut self) -> Result<AudioPlayer, Error> {
+    fn create_player(&mut self) -> Result<WebAudioPlayer, Error> {
         let sink_node = AudioWorkletNode::new(&self.webctx, "rust_speaker_worklet").ey()?;
 
         // Connect worklet to destination
@@ -188,14 +288,14 @@ impl AudioSystem {
         decoder_error.forget();
         output.forget();
 
-        Ok(AudioPlayer(audio_decoder))
+        Ok(WebAudioPlayer(audio_decoder))
     }
 }
 
-pub struct AudioPlayer(AudioDecoder);
+pub struct WebAudioPlayer(AudioDecoder);
 
-impl AudioPlayer {
-    pub fn play_opus(&mut self, payload: &[u8]) {
+impl super::AudioPlayerInterface for WebAudioPlayer {
+    fn play_opus(&mut self, payload: &[u8]) {
         let js_audio_payload = Uint8Array::from(payload);
         let _ = self.0.decode(
             &EncodedAudioChunk::new(&EncodedAudioChunkInit::new(
@@ -418,94 +518,8 @@ pub async fn network_connect(
     crate::network_loop(username, event_rx, reader, writer).await
 }
 
-pub fn set_default_username(username: &str) -> Option<()> {
-    web_sys::window()?
-        .local_storage()
-        .ok()??
-        .set_item("username", username)
-        .ok()
-}
-
-pub fn set_default_server(username: &str) -> Option<()> {
-    None
-}
-
-pub fn load_username() -> Option<String> {
-    web_sys::window()
-        .unwrap()
-        .local_storage()
-        .ok()??
-        .get_item("username")
-        .ok()?
-}
-
-pub fn load_server_url() -> Option<String> {
-    None
-}
-
 pub fn absolute_url(path: &str) -> Result<Url, Error> {
     let window: web_sys::Window = web_sys::window().expect("no global `window` exists");
     let location = window.location();
     Ok(Url::parse(&location.href().ey()?)?.join(path)?)
 }
-
-pub async fn load_config() -> color_eyre::Result<ClientConfig> {
-    let config_url = match option_env!("MUMBLE_WEB2_GUI_CONFIG_URL") {
-        Some(url) => Url::parse(url)?,
-        None => absolute_url("config")?,
-    };
-    info!("loading config from {}", config_url);
-
-    let config = reqwest::get(config_url)
-        .await?
-        .json::<ClientConfig>()
-        .await?;
-
-    Ok(config)
-}
-
-pub async fn get_status(client: &reqwest::Client) -> color_eyre::Result<ServerStatus> {
-    Ok(client
-        .get(absolute_url("status")?)
-        .send()
-        .await?
-        .json::<ServerStatus>()
-        .await?)
-}
-
-pub fn init_logging() {
-    // copied from tracing_web example usage
-
-    use tracing_subscriber::fmt::format::Pretty;
-    use tracing_subscriber::prelude::*;
-    use tracing_web::{performance_layer, MakeWebConsoleWriter};
-
-    let fmt_layer = tracing_subscriber::fmt::layer()
-        .with_ansi(false) // Only partially supported across browsers
-        .without_time() // std::time is not available in browsers
-        .with_writer(MakeWebConsoleWriter::new()) // write events to the console
-        .with_filter(LevelFilter::DEBUG);
-    let perf_layer = performance_layer().with_details_from_fields(Pretty::default());
-
-    tracing_subscriber::registry()
-        .with(fmt_layer)
-        .with(perf_layer)
-        .init();
-
-    info!("logging initiated");
-}
-
-pub struct SpawnHandle;
-
-impl SpawnHandle {
-    pub fn current() -> Self {
-        SpawnHandle
-    }
-
-    pub fn spawn<F>(&self, future: F)
-    where
-        F: Future<Output = ()> + 'static,
-    {
-        spawn(future);
-    }
-}

gui/src/lib.rs

@@ -7,11 +7,12 @@ use asynchronous_codec::FramedWrite;
 use color_eyre::eyre::{bail, Error};
 use dioxus::prelude::*;
 use futures::select;
+use futures::AsyncRead;
+use futures::AsyncWrite;
 use futures::FutureExt as _;
 use futures::SinkExt as _;
 use futures::StreamExt as _;
 use futures_channel::mpsc::UnboundedSender;
-pub use imp::spawn;
 use msghtml::process_message_html;
 use mumble_protocol::control::msgs;
 use mumble_protocol::control::ControlCodec;
@@ -27,7 +28,10 @@ use tracing::error;
 use tracing::info;
 
 use crate::effects::AudioProcessor;
-use crate::imp::AudioSystem;
+use crate::imp::{
+    AudioPlayer, AudioPlayerInterface as _, AudioSystem, AudioSystemInterface as _, Platform,
+    PlatformInterface as _,
+};
 
 pub mod app;
 mod effects;
@@ -47,7 +51,9 @@ pub async fn network_entrypoint(mut event_rx: UnboundedReceiver<Command>) {
 
         *STATE.server.write() = Default::default();
         *STATE.status.write() = ConnectionState::Connecting;
-        if let Err(error) = imp::network_connect(address, username, &mut event_rx, &config).await {
+        if let Err(error) =
+            Platform::network_connect(address, username, &mut event_rx, &config).await
+        {
             error!("could not connect {:?}", error);
             *STATE.status.write() = ConnectionState::Failed(error.to_string());
         } else {
@@ -56,7 +62,7 @@ pub async fn network_entrypoint(mut event_rx: UnboundedReceiver<Command>) {
     }
 }
 
-pub async fn network_loop<R: imp::ImpRead, W: imp::ImpWrite>(
+pub async fn network_loop<R: AsyncRead + Unpin + 'static, W: AsyncWrite + Unpin + 'static>(
     username: String,
     event_rx: &mut UnboundedReceiver<Command>,
     mut reader: FramedRead<R, ControlCodec<Serverbound, Clientbound>>,
@@ -105,12 +111,12 @@ pub async fn network_loop<R: imp::ImpRead, W: imp::ImpWrite>(
                     break;
                 }
 
-                imp::sleep(Duration::from_millis(3000)).await;
+                Platform::sleep(Duration::from_millis(3000)).await;
             }
         });
     }
 
-    let mut audio = imp::AudioSystem::new().await?;
+    let mut audio = AudioSystem::new().await?;
     {
         let send_chan = send_chan.clone();
         let mut sequence_num = 0;
@@ -296,8 +302,8 @@ fn accept_command(
 
 fn accept_packet(
     msg: ControlPacket<mumble_protocol::Clientbound>,
-    audio_context: &mut imp::AudioSystem,
-    player_map: &mut HashMap<u32, imp::AudioPlayer>,
+    audio_context: &mut AudioSystem,
+    player_map: &mut HashMap<u32, AudioPlayer>,
 ) -> Result<(), Error> {
     match msg {
         ControlPacket::UDPTunnel(u) => {

gui/src/main.rs

@@ -1,6 +1,6 @@
-use mumble_web2_gui::{app, imp};
+use mumble_web2_gui::{app, imp::Platform, imp::PlatformInterface as _};
 
 pub fn main() {
-    imp::init_logging();
+    Platform::init_logging();
     dioxus::launch(app::app);
 }