Implement framework for utterance callbacks in Windows backends, though they aren't currently called.

src/backends/tolk.rs

@@ -2,7 +2,7 @@
 use log::{info, trace};
 use tolk::Tolk as TolkPtr;
 
-use crate::{Backend, Error, Features, UtteranceId};
+use crate::{Backend, BackendId, Error, Features, UtteranceId};
 
 pub struct Tolk(TolkPtr);
 
@@ -19,6 +19,10 @@ impl Tolk {
 }
 
 impl Backend for Tolk {
+    fn id(&self) -> Option<BackendId> {
+        None
+    }
+
     fn supported_features(&self) -> Features {
         Features {
             stop: true,

src/backends/winrt.rs

@@ -1,4 +1,7 @@
 #[cfg(windows)]
+use std::sync::Mutex;
+
+use lazy_static::lazy_static;
 use log::{info, trace};
 
 use tts_winrt_bindings::windows::media::core::MediaSource;
@@ -7,7 +10,7 @@ use tts_winrt_bindings::windows::media::playback::{
 };
 use tts_winrt_bindings::windows::media::speech_synthesis::SpeechSynthesizer;
 
-use crate::{Backend, Error, Features, UtteranceId};
+use crate::{Backend, BackendId, Error, Features, UtteranceId};
 
 impl From<winrt::Error> for Error {
     fn from(e: winrt::Error) -> Self {
@@ -16,11 +19,16 @@ impl From<winrt::Error> for Error {
 }
 
 pub struct WinRT {
+    id: BackendId,
     synth: SpeechSynthesizer,
     player: MediaPlayer,
     playback_list: MediaPlaybackList,
 }
 
+lazy_static! {
+    static ref NEXT_BACKEND_ID: Mutex<u64> = Mutex::new(0);
+}
+
 impl WinRT {
     pub fn new() -> std::result::Result<Self, Error> {
         info!("Initializing WinRT backend");
@@ -28,11 +36,15 @@ impl WinRT {
         let player = MediaPlayer::new()?;
         player.set_auto_play(true)?;
         player.set_source(&playback_list)?;
-        Ok(Self {
+        let mut backend_id = NEXT_BACKEND_ID.lock().unwrap();
+        let rv = Ok(Self {
+            id: BackendId::WinRT(*backend_id),
             synth: SpeechSynthesizer::new()?,
             player: player,
             playback_list: playback_list,
-        })
+        });
+        *backend_id += 1;
+        rv
     }
 
     fn reinit_player(&mut self) -> std::result::Result<(), Error> {
@@ -45,6 +57,10 @@ impl WinRT {
 }
 
 impl Backend for WinRT {
+    fn id(&self) -> Option<BackendId> {
+        Some(self.id)
+    }
+
     fn supported_features(&self) -> Features {
         Features {
             stop: true,
@@ -52,6 +68,7 @@ impl Backend for WinRT {
             pitch: true,
             volume: true,
             is_speaking: true,
+            ..Default::default()
         }
     }
 

src/lib.rs

@@ -46,14 +46,14 @@ pub enum Backends {
     AvFoundation,
 }
 
-#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 pub enum BackendId {
     #[cfg(target_os = "linux")]
     SpeechDispatcher(u64),
     #[cfg(target_arch = "wasm32")]
     Web(u64),
     #[cfg(windows)]
-    WinRT(MediaPlaybackItem),
+    WinRT(u64),
 }
 
 #[derive(Clone, Debug, PartialEq)]