Snd + Jack, multiple file playback and recording

[errordeveloper]

Hello Bill and the List,

I've got a question about how could one play multiple files and record
via jack in snd, also asining files to certain channels, suppose each
file is mono.


cheers,
--
Ilya .d

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[Kjetil S. Matheussen-3]

On Thu, 29 Oct 2009, Ilya D wrote:

> Hello Bill and the List,
>
> I've got a question about how could one play multiple files and record
> via jack in snd, also asining files to certain channels, suppose each
> file is mono.
>

By using snd-ls instead of snd, you can play multiple files properly
using the "rt-snd-play" function in rt-player.scm.
To assign certain channels to files, you can probably easely extend
the "<snd-rt-player>" function with a channel argument, and also
set the first argument for "out" appropriately.

Recording with jack using snd is not working very well, I think.
I think the sndrec program might work, but not snd itself.
Instead you should look at jack_capture:
http://archive.notam02.no/arkiv/src/?C=M;O=D

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[Kjetil S. Matheussen-3]

On Thu, 29 Oct 2009, Kjetil S. Matheussen wrote:
> using the "rt-snd-play" function in rt-player.scm.
> To assign certain channels to files, you can probably easely extend
> the "<snd-rt-player>" function with a channel argument, and also
> set the first argument for "out" appropriately.
>
s/appropriately/accordingly/

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[Bill Schottstaedt]

snd-rt is probably the right thing, but if you want to use Snd,
get the current tarball or CVS version (the stuff in the earlier
play.scm seems to be broken), and:

(bind-key #\o 0
  (lambda () ; send oboe.snd to chan 0
    (play "oboe.snd" 0 #f #f #f #f #f 0)))   ; how many #f's??

(bind-key #\p 0
  (lambda () ; send pistol.snd to chan 1
    (play "pistol.snd" 0 #f #f #f #f #f 1)))

;;; Now open a sound (so you have a non-listener pane to type to)

(play #f 22050 2) ; srate 22050, 2 output chans

;;; this holds the DAC open indefinitely
;;; Now type o and p in the sound pane until you want to quit, then

(stop-playing)

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[errordeveloper]

On Thu, Oct 29, 2009 at 02:14:14PM -0700, Bill Schottstaedt wrote:

> snd-rt is probably the right thing, but if you want to use Snd,
> get the current tarball or CVS version (the stuff in the earlier
> play.scm seems to be broken), and:
>
> (bind-key #\o 0
>   (lambda () ; send oboe.snd to chan 0
>     (play "oboe.snd" 0 #f #f #f #f #f 0)))   ; how many #f's??
>
> (bind-key #\p 0
>   (lambda () ; send pistol.snd to chan 1
>     (play "pistol.snd" 0 #f #f #f #f #f 1)))
>
> ;;; Now open a sound (so you have a non-listener pane to type to)
>
> (play #f 22050 2) ; srate 22050, 2 output chans
>
> ;;; this holds the DAC open indefinitely
> ;;; Now type o and p in the sound pane until you want to quit, then
>
> (stop-playing)

i would like to actually do it without the GUI.
the idea is about building an embedded linux box with a micro-controller
on a serial port.

so after opening a port and evaluating the input strings as commands
(i haven't figured how to do that exactly, but should be easily doable)
i want to run some procs that will play files assigned to the outputs of
the soundcards.
the box would be a harddrive recorder basically ;)
i might use digital multichannel interface for audio IO.

i would need to be able to patch some channels in jack and record the
output back into snd.
so say i got 8 channels and 6 off them i'd like to play while the other
two will pass trough an external FX via jack and record the two
processed chans back into snd.

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