check_input_settings does not raise exception for some unsupported sample rates on macOS

[HaroldMills]

On my 2019 MacBook Pro running macOS 13.6.1, the following script:

import sounddevice as sd

settings = {'device': 1, 'channels': 1, 'samplerate': 44100, 'dtype': 'int16'}
sd.check_input_settings(**settings)
sd.rec(frames=settings['samplerate'], blocking=True, **settings)

(you might need to modify the device index for a different computer) first checks if the specified input settings are supported and then, if they are (i.e. if the call to check_input_settings does not raise an exception), attempts to record for one second with those settings. For my Mac's built-in microphone this works as expected for a sample rate of 44100 Hz. For various other sample rates, however, including 48000, 24000, and 22050 Hz, it does not. For those sample rates the call to check_input_settings does not raise an exception, but the script terminates inside the call to rec with the console message:

libc++abi: terminating

It seems that this may be a bug in check_input_settings, which should raise an exception for unsupported sample rates.

[HaroldMills]

Is there another way to determine whether or not a given sample rate is supported on macOS? I tried using a stream to record, like this:

stream = sd.InputStream(**settings)
stream.start()
stream.read(settings['samplerate'])

hoping that the initializer might raise an exception for an unsupported sample rate, but it does not. The read fails with the same console message that rec produces, as in my original comment.

[HaroldMills]

check_input_settings does reject some sample rates on macOS, namely ones outside of the range [1000, 384000].

[mgeier]

check_input_setting() only calls Pa_IsFormatSupported() from the underlying PortAudio library:

python-sounddevice/sounddevice.py

Lines 680 to 683 in 65d3bc0

	parameters, dtype, samplesize, samplerate = _get_stream_parameters(
	'input', device=device, channels=channels, dtype=dtype, latency=None,
	extra_settings=extra_settings, samplerate=samplerate)
	_check(_lib.Pa_IsFormatSupported(parameters, _ffi.NULL, samplerate))

Can you please ask your question at https://github.com/PortAudio/portaudio/issues or at the PortAudio mailing list?

[HaroldMills]

Thanks for the suggestion. I'll look into this as a PortAudio issue.