[LAU] ALSA: always use samplerate_best

[Grant]

>> I have a USB DAC that can only handle 16/44.1 as input and output. I
>> think ALSA will resample everything to 16/44.1 automatically, but I'd
>
>
> Normally, the application connecting to ALSA looks at the port to find out
> what sample rates it can do and adjusts accordingly. Any recording
> application should lock to the interface rate with no resampleing. MP3s,
> Oggs and other compressed/lossy formats do internal resampling/filtering to
> match the desired output sampling rate anyway, but most of them are 44.1k to
> begin with. Wav files and flac and other no lossy formates are the only ones
> where resampling is needed if they are not already 44.1k. In general any wav
> files will be ones you recorded and already be the right sample rate.
>
> I think what I am saying is that for most cases the sample rate of your
> audio IF doesn't matter. So adding resampling to everything doesn't make
> sense... maybe try without first.


I think you're saying that the ALSA resampler won't be used if the
upstream application does the resampling itself.  Is that correct?
How can I find out if ALSA is the one resampling in a particular
scenario?

- Grant