[PD-dev] proposal: postdsp callbacks
ClaudiusMaximus
gloriousclaudiusmaximus at yahoo.co.uk
Sun Jul 17 10:05:04 CEST 2005
Miller Puckette wrote:
> My own interest in doing this is that it would allow using tilde objects
> to treat video. I'd make special tilde objects to read lines out of a
> pdp buffer and write them back in; then just insert any DSP chain into a
> pdp chain and make computer music with the pixels...
>
> cheers
> Miller
I have been converting images to sound with Gridflow, it's quite fun:
grid in
|
[#cast float32]
|
[# / 255]
|
[# - 0.5]
|
[#export_list]
|
[listprepend 0]
|
[send $0-mysound]
[table $0-mysound 128]
with various logic to extract different regions/channels of images to
send to the table.
The only problem is that I have to set the audio buffer size very high
(370ms) to avoid clicks when each frame is generated. I don't know if
using [any] and [delay] to stagger the computation through time would
work - ie, not crash ;) - I guess I'll have to try it.
I did a live set for http://leplacard.org on Thursday using video->sound
conversion, which can be downloaded (together with the Pd+Gridflow
patches used in the performance) from:
http://www.archive.org/audio/audio-details-db.php?collectionid=ClaudiusMaximus_-_LePlacard_Live_2005-07-14&collection=opensource_audio
or (same page)
http://makeashorterlink.com/?L31364F6B
A much simpler (and commented!) implementation of this technique is
attached, whereas the performance patch contains quite a few other
things which I haven't bothered to document. Warning: the output is loud!
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