Re: [LAU] midi capture of external hardware over usb

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To: David Adler <david.jo.adler@...>
Cc: <linux-audio-user@...>
Date: Sunday, December 20, 2009 - 5:09 am

On Sat, 19 Dec 2009, David Adler wrote:

> Some things I unfortunately don't know:

For a typical jack app (like midixlate), you only have
latencies for the hardware ports. (Usually estimated by
SAMPLES_PER_PERIOD * PERIODS_PER_BUFFER / SAMPLE_RATE,
e.g. 1024*2/48000 = 42.7 ms.) I
think you get 2x that figure if you're doing both input and
output -- but it might be 1x.

There's no additional latency for the software
processing.[1] This is the main advertisement for the JACK
API -- it adds *no* additional latency.[2]

Peace,
Gabriel

[1] That is, unless you have a complicated JACK
connection graph, or a processor that
intentionally creates delays.
[2] See http://jackaudio.org/faq "Doesn't use [sic] JACK
add latency?"
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Messages in current thread:
[LAU] midi capture of external hardware over usb, robert lazarski, (Sat Dec 19, 5:32 pm)
Re: [LAU] midi capture of external hardware over usb, Gabriel M. Beddingfield, (Sat Dec 19, 5:40 pm)
Re: [LAU] midi capture of external hardware over usb, robert lazarski, (Sat Dec 19, 6:39 pm)
Re: [LAU] midi capture of external hardware over usb, Gabriel M. Beddingfield, (Sat Dec 19, 6:57 pm)
Re: [LAU] midi capture of external hardware over usb, robert lazarski, (Sat Dec 19, 7:16 pm)
Re: [LAU] midi capture of external hardware over usb, Gabriel M. Beddingfield, (Sat Dec 19, 8:51 pm)
Re: [LAU] midi capture of external hardware over usb, robert lazarski, (Sat Dec 19, 11:35 pm)
Re: [LAU] midi capture of external hardware over usb, Gabriel M. Beddingfield, (Sat Dec 19, 11:52 pm)
Re: [LAU] midi capture of external hardware over usb, robert lazarski, (Sun Dec 20, 12:24 am)
Re: [LAU] midi capture of external hardware over usb, Gabriel M. Beddingfield, (Sun Dec 20, 4:46 am)
Re: [LAU] midi capture of external hardware over usb, Alexandre Ratchov, (Sun Dec 20, 3:11 pm)
Re: [LAU] midi capture of external hardware over usb, Gabriel M. Beddingfield, (Sat Dec 19, 9:23 pm)
Re: [LAU] midi capture of external hardware over usb, David Adler, (Sat Dec 19, 10:57 pm)
Re: [LAU] midi capture of external hardware over usb, Gabriel M. Beddingfield, (Sun Dec 20, 5:09 am)