High callback rate not supported for macos

[rishadbaniya]

If i were to put a output device params as something like this

            let out_device_params = OutputDeviceParameters {
                sample_rate: 44000
                channels_count: 2,
                channel_sample_count: 1,
            };

it would work very well with pulseaudio(i.e in linux), but with macos it seems the callback isn't called "fast enough" i.e it doesn't call it 44000 times in this case

[mrDIMAS]

This crate may not support output with very low latency, simply because it uses more or less high level OS APIs under the hood. 2 sample buffer is definitely some extreme values, given the fact that it stands for just ~22 microseconds. Instead, you should prefer having reasonably large buffer, for example 1/10th of sample rate will be 100ms which is already decently low latency for most applications.

[sourcebox]

I agree that very low buffer sizes as 1 samples could not be expected to work properly, but something like 64 to 256 samples should be ok.

Interestingly, I can get much lower buffer sizes with my old Intel MacPro running High Sierra than using a M2 Mac mini on macOS Sonoma with the same code. Something must have been changed in the scheduling of the OS with the newer versions.