linuxaudio.org

On Mon, Apr 16, 2012 at 05:21:47PM -0400, S. Massy wrote:
> Okay, so for a standard 2 periods of 128 frames each, my nominal dddelay

quoted text
> is 256 frames or 5.3ms at a sr of 48k, twice that for a round-trip.

No. The nominal roundtrip-delay (physical input to physical output

if you connect the corresponding ports directly) is period * nperiods.
1 * period occurs at the input, (nperiods - 1) * period at the output.
If you masure it using jack_delay you will in most cases find a value

that is a bit higher, this is due to delay in AD/DA converters etc. For

some types of soundcard (e.g. USB) the real latency can be significantly

higher than the nominal value. You can tell Jack about this using the

-I and -O options.
The extra delay when making a loop such as Ardour -> jconvolver -> Ardour

is one period.
Ciao,
--

FA
A world of exhaustive, reliable metadata would be an utopia.

It's also a pipe-dream, founded on self-delusion, nerd hubris

and hysterically inflated market opportunities. (Cory Doctorow)
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