Subject: Re: [linux-audio-dev] jack question
From: Paul Davis (pbd_AT_Op.Net)
Date: Wed Nov 21 2001 - 23:48:05 EET
>I am attempting to write a piece of code that does output via jackd. I'm
>playing a bit with the jack_simple_client program. From what I
>understand this client connects "ALSA I/O:Input 1" to
>"ALSA I/O:Output 1",
not quite. it connects *its* input port to "ALSA I/O:Input 1" and
*its* output port to "ALSA I/O:Output 1". the effect is the same, but
the concept is a little different. you can't actually do what you
describe (only the ALSA client/driver could do that).
i.e. recording from a source and immediately
>outputting it again, right? However, I get no output when running
>jack_simple_client, even though the recording source is set and
>generating data.
>Can anyone confirm that the current jackd actually outputs audio?
yep. myself as well as several other people have run it and heard it
as well.
are you sure you have the capture input set properly in ALSA? do you
have the mixer stuff properly set up for the PCM output stream?
>BTW, if jackd is run with real-time priority, shouldn't all the clients
>be running in real-time too? The process() call runs inside the client
>after all!?
yes. if you call jackd with the -R (realtime) flag, then all clients
must all necessarily be realtime. if they are not, they will not be
able to connect to the server, since they stand an (increased) chance
of messing up the timing of the overall JACK system.
this, like many other things needs to be made more clear.
--p
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