[macOS] QAudioSink chooses a default buffer size that's too small, causes buffer underruns

In the attached project...

1. The QAudioDecoder parses an MP3 file (source: https://samplelib.com/sample-mp3.html )
2. The fully decoded file is stored in a QBuffer
3. After that, a QAudioSink is initialized using the QAudioFormat that's calculated by the QAudioDecoder
4. Finally, the QAudioSink is used to play the QBuffer data.

Outcomes

• On Windows, the QAudioSink's internal buffer is 176400 bytes, and playback is smooth.
• On macOS, the QAudioSink's internal buffer is 8192 bytes, and playback stutters with frequent BufferUnderrun errors.

Workaround
Manually call QAudioSink::setBufferSize() to set a larger buffer

Notes
Interestingly, playback on macOS is smooth if the QGuiApplication is replaced with a QCoreApplication