[LAU] Do USB DACs use a buffer?

Fons Adriaensen fons at linuxaudio.org
Sun Jul 17 17:52:48 UTC 2011


On Sun, Jul 17, 2011 at 09:57:59AM -0700, Grant wrote:

> Does anyone know if USB DACs use any sort of internal buffer or if the
> data they receive is converted the moment it is received?  Does this
> behavior change depending on whether the DAC operates in synchronous
> or asynchronous mode?

Audio data is always buffered. You can't expect the USB system
to deliver 48000 (or whatever your sample rate is) packets
'just' in time. How much buffering depends on the USB mode and
on what the device requests.

-- 
FA



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