Fix save/load config

[ANDRO90]

Additionally, automatically check the loaded audio format

Signed-off-by: Andrea Bellotti andrea.bellotti@outlook.com

[cboulay]

Hi and thanks for the PR.
Are you able to manually test this out on Win / Mac / Linux? i.e., capture audio input, record to LabRecorder, then open the xdf file and play it back? While the changes seem innocuous, I remember when working on this that I was often surprised by how easy it was to give settings that didn't work properly on one platform or another so I preferred loading values from the device instead of from a config file.

Unfortunately the CI systems don't let us create an audio stream and capture it then verify that the data are captured correctly, so there's no automatic way to test.

[ANDRO90]

Hi Chad,

I should be able to test everything (apart form the number of mic channels) on all 3 platforms in the coming days.
I'll post a feedback ASAP.

[tstenner]

All settings are index based, so whenever the ordering of options changes (either because the OS feels like it after a restart or a device is added/removed) the settings are lost. OTOH, it's a big improvement right now and the checkAudioFormat() on top should make sure that there are valid settings after loading the file.