Merge a55463dac8 into 5c528f1d8e

This prevents a crash when multiple instances of the TTS engine are instantiated.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "tts"
-version = "0.25.5"
+version = "0.25.6"
 authors = ["Nolan Darilek <nolan@thewordnerd.info>"]
 repository = "https://github.com/ndarilek/tts-rs"
 description = "High-level Text-To-Speech (TTS) interface"
@@ -30,7 +30,14 @@ env_logger = "0.10"
 
 [target.'cfg(windows)'.dependencies]
 tolk = { version = "0.5", optional = true }
-windows = { version = "0.48", features = ["Foundation", "Foundation_Collections", "Media_Core", "Media_Playback", "Media_SpeechSynthesis", "Storage_Streams"] }
+windows = { version = "0.51", features = [
+    "Foundation",
+    "Foundation_Collections",
+    "Media_Core",
+    "Media_Playback",
+    "Media_SpeechSynthesis",
+    "Storage_Streams",
+] }
 
 [target.'cfg(target_os = "linux")'.dependencies]
 speech-dispatcher = { version = "0.16", default-features = false }
@@ -43,7 +50,16 @@ objc = { version = "0.2", features = ["exception"] }
 
 [target.wasm32-unknown-unknown.dependencies]
 wasm-bindgen = "0.2"
-web-sys = { version = "0.3", features = ["EventTarget", "SpeechSynthesis", "SpeechSynthesisErrorCode", "SpeechSynthesisErrorEvent", "SpeechSynthesisEvent", "SpeechSynthesisUtterance", "SpeechSynthesisVoice", "Window", ] }
+web-sys = { version = "0.3", features = [
+    "EventTarget",
+    "SpeechSynthesis",
+    "SpeechSynthesisErrorCode",
+    "SpeechSynthesisErrorEvent",
+    "SpeechSynthesisEvent",
+    "SpeechSynthesisUtterance",
+    "SpeechSynthesisVoice",
+    "Window",
+] }
 
 [target.'cfg(target_os="android")'.dependencies]
 jni = "0.21"

src/backends/av_foundation.rs

@@ -8,7 +8,7 @@ use core_foundation::base::TCFType;
 use core_foundation::string::CFString;
 use lazy_static::lazy_static;
 use log::{info, trace};
-use objc::runtime::{Object, Sel};
+use objc::runtime::{Class, Object, Sel};
 use objc::{class, declare::ClassDecl, msg_send, sel, sel_impl};
 use oxilangtag::LanguageTag;
 
@@ -25,13 +25,7 @@ pub(crate) struct AvFoundation {
     voice: Option<Voice>,
 }
 
-lazy_static! {
-    static ref NEXT_BACKEND_ID: Mutex<u64> = Mutex::new(0);
-}
-
-impl AvFoundation {
-    pub(crate) fn new() -> Result<Self, Error> {
-        info!("Initializing AVFoundation backend");
+fn make_speech_sythesizer_delegate() -> Result<&'static Class, Error> {
     let mut decl = ClassDecl::new("MyNSSpeechSynthesizerDelegate", class!(NSObject))
         .ok_or(Error::OperationFailed)?;
     decl.add_ivar::<u64>("backend_id");
@@ -126,8 +120,19 @@ impl AvFoundation {
         );
     }
 
-        let delegate_class = decl.register();
-        let delegate_obj: *mut Object = unsafe { msg_send![delegate_class, new] };
+    Ok(decl.register())
+}
+
+lazy_static! {
+    static ref NEXT_BACKEND_ID: Mutex<u64> = Mutex::new(0);
+    static ref DELEGATE_CLASS: &'static Class = make_speech_sythesizer_delegate().unwrap();
+}
+
+impl AvFoundation {
+    pub(crate) fn new() -> Result<Self, Error> {
+        info!("Initializing AVFoundation backend");
+
+        let delegate_obj: *mut Object = unsafe { msg_send![*DELEGATE_CLASS, new] };
         let mut backend_id = NEXT_BACKEND_ID.lock().unwrap();
         let rv = unsafe {
             trace!("Creating synth");

src/lib.rs

@@ -571,7 +571,7 @@ impl Tts {
         if utterance_callbacks {
             let mut callbacks = CALLBACKS.lock().unwrap();
             let id = self.0.read().unwrap().id().unwrap();
-            let mut callbacks = callbacks.get_mut(&id).unwrap();
+            let callbacks = callbacks.get_mut(&id).unwrap();
             callbacks.utterance_begin = callback;
             Ok(())
         } else {
@@ -591,7 +591,7 @@ impl Tts {
         if utterance_callbacks {
             let mut callbacks = CALLBACKS.lock().unwrap();
             let id = self.0.read().unwrap().id().unwrap();
-            let mut callbacks = callbacks.get_mut(&id).unwrap();
+            let callbacks = callbacks.get_mut(&id).unwrap();
             callbacks.utterance_end = callback;
             Ok(())
         } else {
@@ -611,7 +611,7 @@ impl Tts {
         if utterance_callbacks {
             let mut callbacks = CALLBACKS.lock().unwrap();
             let id = self.0.read().unwrap().id().unwrap();
-            let mut callbacks = callbacks.get_mut(&id).unwrap();
+            let callbacks = callbacks.get_mut(&id).unwrap();
             callbacks.utterance_stop = callback;
             Ok(())
         } else {