Hi Seth,
In terms of feature requests, since you are doing all the work already,
it would be nice to have 1x4 mode, meaning one input ->4 convolutions->4
outputs. That would be great for ambisonic (b-format) 4-channel room
impulse responses.
Regards,
Archontis
On 4/5/11 3:54 AM, Seth Nickell wrote:
I'm planning to release our realtime convolution engine (extracted
from http://meatscience.net/pages/convolution-reverb) as a GPLed Pd
external.
It currently accepts 4-channel ('true stereo'), two channel or mono
impulse responses, with stereo or mono output. Performance is
excellent if you have SSE3 and has a fallback in case you don't, and
it aims for accuracy (basically that means multi-stage scaling to keep
floats within healthy sizes).
1) I'd love to swipe the convolve~ external name, currently installed
by mjlib as part of pd-extended. convolve~ from mjlib appears to be a
copy of pin~ ? so I think it could be taken? Maybe I mis-read the
code. I've cc'ed mark who can probably clarify.
2) Anyone have requests for features/api? Its currently simplistic:
- takes a "read FILENAME" message, loads the file, does a test
convolution against pink noise to normalize the gain to something sane
- caches the last N impulse responses, as the test convolution
takes a little time
- allows setting the cache size with a "cachesize N" message
- disable normalization with "normalize 0" or "normalize 1"
Features I'm considering (let me know if they sound useful):
- load from an array instead of from disk (no gain normalization?)
- It wouldn't be hard to enable MxN convolution if that floats
somebody's boat.
3) I can compile/test on Mac& Linux, anyone up for helping me with Windows?
4) Would this be of interest for Pd-extended?
5) I'd love to build a granular convolution engine.... takes two
real-time signals, and extracts grains from one to convolve against
the other. Anyone have ideas about this?
thanks all,
-Seth
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