Re: [Discuss-gnuradio] Changes to Audio Sink / Source ?

[Michael Dickens]

On Nov 30, 2005, at 5:19 PM, Eric Blossom wrote:
> OS/X question: does CoreAudio resample for you, or are you  
> restricted to
> the rates that the card supports natively?  As I recall, most macs
> only support a couple of rates.

CoreAudio does everything necessary to convert inputs to appropriate  
outputs.  This includes changing the sample rate, converting between  
formats (float to e.g. Int32), and lots of other things.  My gr-audio  
driver is pretty bare bones ... allowing as many channels as desired  
but doing nothing fancy with them.

CoreAudio is an abstraction / conversion / interpretation layer  
between drivers / applications and hardware.  It provides a  
consistent API to the latter, while using the former natively and to  
its capabilities.

Hence, I can assign (as far as I can tell in testing; e.g. 11235) any  
sampling rate and CoreAudio converts it for me.

BTW> In examples/audio, it seems like the "dst" in "multi_...",  
"dial_...", and "mono..." generate way too much data.  I don't think  
this is a clock mismatch ... I haven't had time to look further;  
maybe some who knows these things better than I could take a gander.