4 Aug
2021
4 Aug
'21
9:14 a.m.
Friends
I have a Raspberry PI with a PI Sound board. Wanting to use modep
(https://blokas.io/modep/) live I have hacked a pedal together and can
change settings with it.
modep is a gnarly ball of python and tomahawk (sp?) that I do not need
so I have stripped down the actions the pedal needs to do to eight Jack
operations: disconnect the left and right output and input, and
reconnect them in a different way to affect an effect change.
I have written a small rust programme with the jack crate to interface
with Jack. Four disconnects, four connects.
It takes over 200ms of system time, optimised rust. Two hundred
milliseconds is a long time.
Can anybody tell me why? Is there a solution?
I am hoping to get it down to ten milliseconds.
Worik
--
If not me then who? If not now then when? If not here then where?
So, here I stand, I can do no other
root(a)worik.org 021-1680650, (03) 4821804 Aotearoa (New Zealand)
4 Aug
4 Aug
9:17 a.m.
THere's nowhere near enough information to comment constructively.
1) which version of JACK
2) what settings is JACK running with?
3) what claims does the JACK "crate" make? there is no "approved"
Rust
binding for the JACK API at this point in time....
On Tue, Aug 3, 2021 at 11:14 PM worik <root(a)worik.org> wrote:
Friends
I have a Raspberry PI with a PI Sound board. Wanting to use modep
(https://blokas.io/modep/) live I have hacked a pedal together and can
change settings with it.
modep is a gnarly ball of python and tomahawk (sp?) that I do not need
so I have stripped down the actions the pedal needs to do to eight Jack
operations: disconnect the left and right output and input, and
reconnect them in a different way to affect an effect change.
I have written a small rust programme with the jack crate to interface
with Jack. Four disconnects, four connects.
It takes over 200ms of system time, optimised rust. Two hundred
milliseconds is a long time.
Can anybody tell me why? Is there a solution?
I am hoping to get it down to ten milliseconds.
Worik
--
If not me then who? If not now then when? If not here then where?
So, here I stand, I can do no other
root(a)worik.org 021-1680650, (03) 4821804 Aotearoa (New Zealand)
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10:53 a.m.
On 4/08/21 5:16 pm, Paul Davis wrote:
THere's nowhere near enough information to comment
constructively.
What I need to know, from someone who has done it, is 200ms in the ball
park of as fast as Jack can go, or is it worth optimising?
If some one out there has experience using the Jack API, I would love an
answer to that question.
1) which version of JACK
$ jackd
--version
jackdmp version 1.9.12 tmpdir /dev/shm protocol 8
2) what settings is JACK running with?
I am using whatever defaults the patchbox distribution uses, I believe.
I am unsure how to get jack to dump its settings
/usr/bin/jackd -t 2000 -R -P 95 -d alsa -d hw:pisound -r 48000 -p 128 -n
2 -X seq -s -S
3) what claims does the JACK "crate" make?
there is no "approved" Rust
binding for the JACK API at this point in time....
It is a wrapper around the C
API. I have looked inside, and that is
what it looks like to me.
On Tue, Aug 3, 2021 at 11:14 PM worik <root(a)worik.org> wrote:
--
If not me then who? If not now then when? If not here then where?
So, here I stand, I can do no other
root(a)worik.org 021-1680650, (03) 4821804 Aotearoa (New Zealand)
6 Aug
6 Aug
2:21 a.m.
On 4/08/21 6:53 pm, worik wrote:
On 4/08/21 5:16 pm, Paul Davis wrote:
Answering my own question: It is creating the client that is slow. I
can get 10ms easily if I keep the client around.
I was trying to use a programme that started, did the mahi, then quit.
A simpler approach, but too simple. Using a loop works a treat
--
If not me then who? If not now then when? If not here then where?
So, here I stand, I can do no other
root(a)worik.org 021-1680650, (03) 4821804 Aotearoa (New Zealand)
THere's nowhere near enough information to
comment constructively.
What I need to know, from someone who has done it, is 200ms
in the ball
park of as fast as Jack can go, or is it worth optimising?
If some one out there has experience using the Jack API, I would love an
answer to that question.
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days inactive
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