18 Oct
2006
18 Oct
'06
7:55 a.m.
On Wed, Oct 18, 2006 at 12:48:59 +0100, Dan Mills wrote:
--- John Rigg <ladev(a)sound-man.co.uk> wrote:
the gain calculations are relativly cheap, its converting those gain
levels back into a gain coefficient on the output that's expensive (from
what I remember).
the gain tracking is done per sample, but the cofficient calcualtion is
done every 4.
If the control signal is derived from the
upsampled
input
to the compressor, that is taken care of.
But that puts potentially expensive gain calculations
into the fast sr code, also I was rather planning on
using the impulse used for the upsampler to provide
the band limiting for free. BEAST was the project that had the SSE 2* up/down
sampler code that seems to be reasonably quick.
But what interpolation function? If you something obvious and cheap you
may as well not bother, as you wont get accurate peak interpolation.
The API is likely to be 'interesting' as most
dynamics
plugs don't generate an array of gain values then
apply them, and a single sample streaming resampler
doesn't bear thinking about.
I dont think a streaming resampler is more challenging than a correct one
that runs on buffers. You just have to preserve state with every call,
rather than at the buffer boundaries.
- Steve