Re: [LAD] ANN: convoLV2 0.2

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To: <linux-audio-dev@...>
Date: Saturday, October 20, 2012 - 11:44 am

On Sat, Oct 20, 2012 at 12:14:29AM -0400, David Robillard wrote:

> convoLV2 is in an early stage of development and is not yet suitable for

Since you invited remarks:

ConvoLV2 uses libzita-convolver, but in a very inefficient way,
by restricting it to a single partition size equal to the process
block size. This is NOT necessary in order to obtain zero latency,
in fact the whole point of zita-convolver is that it can provide
zero latency even if most of the convolution is computed using
partition sizes much larger than the process block size.

> This plugin is intended to provide latency-free synchronous convolution,

This is simply not true. A fixed, power-of-2 block size is NOT
necessary in order to obtain zero latency, not even if you use
multiple partition sizes. Supporting an arbitrary block size
(within some reasonable limits) is just a bit more complicated.
But it can be done quite efficienty using two Convproc instances
for example.

Thirdly, for the use case of reverbs, the whole latency issue is
just irrelevant. A reverb IR should not contain the direct sound
(since this will be mixed in separately), and in fact the first
10 ms or so should be silence anyway, they don't contribute to
the effect and just cause coloration. Which means you can adopt
a scheme that permits arbitrary block sizes by allowing one (Jack)
period of latency. Just remove as many samples from the start of
the IR to compensate.

Ciao,

--
FA

A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)

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Messages in current thread:
[LAD] ANN: convoLV2 0.2, David Robillard, (Sat Oct 20, 4:14 am)
Re: [LAD] ANN: convoLV2 0.2, Tom Szilagyi, (Sat Oct 20, 1:27 pm)
Re: [LAD] ANN: convoLV2 0.2, David Robillard, (Sat Oct 20, 6:39 pm)
Re: [LAD] ANN: convoLV2 0.2, Robin Gareus, (Sat Oct 20, 5:45 pm)
Re: [LAD] ANN: convoLV2 0.2, Tom Szilagyi, (Sun Oct 21, 10:41 am)
Re: [LAD] ANN: convoLV2 0.2, Robin Gareus, (Sun Oct 21, 1:48 pm)
Re: [LAD] ANN: convoLV2 0.2, Fons Adriaensen, (Sun Oct 21, 1:04 pm)
Re: [LAD] ANN: convoLV2 0.2, Tom Szilagyi, (Sun Oct 21, 10:46 am)
Re: [LAD] ANN: convoLV2 0.2, David Robillard, (Sat Oct 20, 6:42 pm)
Re: [LAD] ANN: convoLV2 0.2, Fons Adriaensen, (Sat Oct 20, 11:44 am)
Re: [LAD] ANN: convoLV2 0.2, David Robillard, (Sat Oct 20, 6:19 pm)
Re: [LAD] ANN: convoLV2 0.2, Robin Gareus, (Sat Oct 20, 5:43 pm)
Re: [LAD] ANN: convoLV2 0.2, Fons Adriaensen, (Sat Oct 20, 9:03 pm)
Re: [LAD] ANN: convoLV2 0.2, David Robillard, (Sat Oct 20, 11:02 pm)
Re: [LAD] ANN: convoLV2 0.2, Fons Adriaensen, (Sun Oct 21, 11:38 am)
Re: [LAD] ANN: convoLV2 0.2, David Robillard, (Sun Oct 21, 5:38 pm)
Re: [LAD] ANN: convoLV2 0.2, Fons Adriaensen, (Sun Oct 21, 7:25 pm)
Re: [LAD] ANN: convoLV2 0.2, David Robillard, (Sun Oct 21, 7:49 pm)
Re: [LAD] ANN: convoLV2 0.2, Fons Adriaensen, (Sun Oct 21, 7:57 pm)
Re: [LAD] ANN: convoLV2 0.2, David Robillard, (Sun Oct 21, 5:36 pm)
Re: [LAD] ANN: convoLV2 0.2, Fons Adriaensen, (Sun Oct 21, 7:44 pm)
Re: [LAD] ANN: convoLV2 0.2, David Robillard, (Sun Oct 21, 7:59 pm)
Re: [LAD] ANN: convoLV2 0.2, Fons Adriaensen, (Sun Oct 21, 3:35 pm)
Re: [LAD] ANN: convoLV2 0.2, hermann meyer, (Sun Oct 21, 12:09 pm)
Re: [LAD] ANN: convoLV2 0.2, hermann meyer, (Sun Oct 21, 12:04 pm)
Re: [LAD] ANN: convoLV2 0.2, Fons Adriaensen, (Sun Oct 21, 12:15 pm)
Re: [LAD] ANN: convoLV2 0.2, hermann meyer, (Sun Oct 21, 12:02 pm)
Re: [LAD] ANN: convoLV2 0.2, hermann meyer, (Sat Oct 20, 7:54 am)
Re: [LAD] ANN: convoLV2 0.2, David Robillard, (Sat Oct 20, 11:47 pm)