Re: [LAD] Optimized device driver to Fast Track Pro (start developing)

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To: Guillaume Pellerin <lists@...>
Cc: Linux Audio Developers <linux-audio-dev@...>
Date: Wednesday, November 28, 2012 - 7:50 pm

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Hi !!!

I am using a jack_delay to measure the Fast Track Pro latency, but
something strange happens...It doesn't matter what configuration I am doing
on Jack that the latency value always is increase during the time... like
the result below:

ladeira@debian:~/Downloads/jack_delay$ ./jack_delay -E -O system:playback_1
-I system:capture_1
??? 412.673 frames 8.597 ms
??? 412.671 frames 8.597 ms
??? 412.671 frames 8.597 ms
??? 413.487 frames 8.614 ms
??? 413.657 frames 8.618 ms
??? 413.670 frames 8.618 ms
??? 413.671 frames 8.618 ms
??? 413.671 frames 8.618 ms
??? 413.671 frames 8.618 ms
??? 414.455 frames 8.634 ms
??? 414.654 frames 8.639 ms
??? 414.670 frames 8.639 ms

What am I doing wrong??

2012/11/26 Guillaume Pellerin

> On 23/11/2012 20:01, rodrigo@angoera.com.br wrote:

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Hi !!!=A0 =A0I am using a jack_delay to=A0measure=A0the=
Fast Track Pro latency, but something strange happens...It doesn't mat=
ter what configuration I am doing on Jack that the latency value always is =
increase during the time... like the result below:
ladeira@debian:~/Downloads/jack_delay$ ./jack_delay -E =
-O system:playback_1 -I system:capture_1??? =A0 =A0 412.673 fram=
es =A0 =A08.597 ms??? =A0 =A0 412.671 frames =A0 =A08.597 ms??? =A0 =A0 412.671 frames =A0 =A08.597 ms
??? =A0 =A0 413.487 frames =A0 =A08.614 ms??? =A0 =A0 413.6=
57 frames =A0 =A08.618 ms??? =A0 =A0 413.670 frames =A0 =A08.618=
ms??? =A0 =A0 413.671 frames =A0 =A08.618 ms??? =A0 =
=A0 413.671 frames =A0 =A08.618 ms
??? =A0 =A0 413.671 frames =A0 =A08.618 ms??? =A0 =A0 414.4=
55 frames =A0 =A08.634 ms??? =A0 =A0 414.654 frames =A0 =A08.639=
ms??? =A0 =A0 414.670 frames =A0 =A08.639 msWhat am I doing wrong??=A0
2012/11/26 Guillaume Pellerin <lists@paris=
son.com
>
On 23/11/2012 20:01, rodrigo@ango=
era.com.br
wrote:

SB3200 has
B
24 bits
tes ) The
tes/s | 1.5
z ... So the

You're absolutely right, the 24 bits 4 channels mode would be only acce=
ssible in
48 kHz samplerate.

> =A0 I would like to know how it works the interface between USB AUDIO =
CLASS device

ous
and I

I don't really know how does the isochronous, but applying usual RT sec=
urity
audio rules seems sufficient to get high priority access and then very low<=
br>
latency (got 3 ms here with few audio realtime processes..).

Further info here:
http://joegiampaoli.blogspot.fr/201=
1/06/m-audio-fast-track-pro-for-debian-linux.html

G

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Messages in current thread:
Re: [LAD] Optimized device driver to Fast Track Pro (start d..., Guillaume Pellerin, (Mon Nov 26, 5:13 pm)
Re: [LAD] Optimized device driver to Fast Track Pro (start d..., Rodrigo T O Ladeira, (Wed Nov 28, 7:50 pm)