[LAD] Tutorial for programming with JACK

[Emanuel Rumpf]

Am 8. März 2012 01:08 schrieb  <kallipygos at inbox.lv>:
>
> It is possible with (curses-ansi escapes) TUI vary sine parameters -
> Frequency and amplitude.
>
Possible with restrictions:
You cannot call blocking functions in jacks process() function.
Thus non-blocking inter-thread communication may be necessary.

>
> Is it possible this program __as_is__ rewrite for jack output ?
>

Jack Audio uses a _callback_ based api.
What you have there is not.

You could re-use the above code with simple adjustments
by adding an additional bridging library.
(Eventually causing loss of realtime capabilities.)

Look at :

bio2jack  --  http://bio2jack.sourceforge.net/

jackasyn  --  http://packages.debian.org/search?suite=default&section=all&arch=any&searchon=sourcenames&keywords=jackasyn
(I couldn't find its original home)

>
> Anyway - What is best (thread?, IPC?) program, structure, realtime-safe,
> for such simple jack-TUI program ?
>
Look at jack example code, for how to make a real jack app.

>
> Normal 16 bit sound samples must be in range
>
Jackd uses 32 bit float.
Everything below -1.0 and above +1.0 is likely to become cut anywhere.
Re-sampling 16-bit to float is possible with additional libraries.


-- 
E.R.