linuxaudio.org

No, with frame/period of 2 it also *seems* to work.

I tried jack_delay, it returns me this whatever frames/period I try.

What that means?
capture latency  = 1024

playback_latency = 1024

Signal below threshold...

Signal below threshold...

Signal below threshold...

Signal below threshold...

Signal below threshold...

Signal below threshold...
2011/4/2, Robin Gareus :

quoted text
> On 04/03/2011 12:52 AM, Bernardo Barros wrote:

>> I would be very embarrassed if I'm fooling myself, but from what I

>> read the information provided by qjackctl, is this really the latency

>> of the audio system as low as 0.08ms with frames/period of 2! :S

>

> must be a typo:  2*16/ 44100Hz = 0.725ms = ~0.8ms

>

> Measure it with 'jack_delay' [1]. The number given in qjackctl's setup

> dialog is the nominal latency; and the time between two jack cycles.

>

> Usually there's additional latency due to [PCI|USB] bus overhead,

> sound-card & ALSA buffering, DAC/ADCs, etc. - around 1 ms round-trip for

> PCI devices.

> http://wiki.linuxaudio.org/wiki/jack_latency_tests

>

> have fun,

> robin

>

>

> [1] http://kokkinizita.linuxaudio.org/linuxaudio/index.html

>

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