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Don't define the AVFoundation delegate more than once.

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This prevents a crash when multiple instances of the TTS engine are instantiated.
This commit is contained in:
Lee Baker 2022-08-06 06:08:28 -05:00
parent f404e180e4
commit a55463dac8
1 changed files with 101 additions and 96 deletions
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25
src/backends/av_foundation.rs
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@ -7,7 +7,7 @@ use core_foundation::array::CFArray;
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 unic_langid::LanguageIdentifier;
@ -24,13 +24,7 @@ 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");
@ -125,8 +119,19 @@ 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");