macOS: calling SpeechSynthesizer.StopSpeakingAsync() and then StartSpeakingTextAsync() does not work immediately

[bpasero]

Describe the bug

A call to SpeechSynthesizer.StopSpeakingAsync() with a new StartSpeakingTextAsync does not synthesise for up to 30 seconds. The log file is here: log.txt

This issue maybe related to #2350 and #1836 and #2264

To Reproduce

We are building a node.js binding for Speech SDK and the C++ sources mimic the samples. The synthesis is implemented here: https://github.com/microsoft/node-speech/blob/967976ce0f4887a2b5b27f486e5209a51588516f/src/main.cc#L477

The call to StopSpeakingAsync here: https://github.com/microsoft/node-speech/blob/967976ce0f4887a2b5b27f486e5209a51588516f/src/main.cc#L539

To reproduce from that module:

• using node.js 18.x on the system
• git clone https://github.com/microsoft/node-speech.git
• open index.ts and append the snippet [1] at the end
• from a terminal cd into the workspace and run npm i
• run node index.js

[1]

const t = createSynthesizer({
  modelPath: '<path to TTS model>',
  modelName: 'Microsoft Server Speech Text to Speech Voice (en-US, AriaNeural)',
  modelKey: '<model key>',
}, (error, result) => {
  if (error) {
    console.error(error);
  } else {
    console.log(result);
  }
});
t.synthesize(`
Now more than ever, developers are expected to build voice-enabled applications that can reach a global audience. With the same voice persona across languages, organizations can keep their brand image more consistent. To support the growing need for a single voice to speak multiple languages, particularly in scenarios such as localization and translation, a multi-lingual neural TTS voice is brought out in public preview.
`);
setTimeout(() => {
  console.log('stopping');
  t.stop();
}, 2000);
setTimeout(() => {
  console.log('synthesizing');
  t.synthesize(`This text is not synthesized`);
}, 3000);

Expected behavior

Calling SpeechSynthesizer.StopSpeakingAsync immediately stops synthesis and StartSpeakingTextAsync works right after.

Version of the Cognitive Services Speech SDK

1.37.0

Platform, Operating System, and Programming Language

• OS: macOS 14.4.1
• Hardware: ARM
• Programming language: C++

//cc @ralph-msft

[pankopon]

Closed as duplicate with the same cause as in #2350.