Subject: Re: [linux-audio-dev] qjackctl port list
From: Fons Adriaensen (fons.adriaensen_AT_skynet.be)
Date: Sun Oct 10 2004 - 00:48:10 EEST
On Sat, Oct 09, 2004 at 10:03:11PM +0100, Rui Nuno Capela wrote:
> Florian's suggestion makes sense, of naming the ports like something in
> the lines of:
>
> out_1L
> out_1R
> out_2L
> out_2R
I tried a number of different schemes, and here are the results:
(creation order 1L, 1R, 2L, 2R, ....)
-> 4L 3L 1L 2L 2R 4R 3R 1R ????
-> out1L out2L out3L out4L out1R out2R out3R out4R
-> out_1L out_2L out_3L out_4L out_1R out_2R out_3R out_4R
-> out_L1 out_L2 out_L3 out_L4 out_R1 out_R2 out_R3 out_R4
So none of them is really satisfactory, and this is only a simple case.
Things wil get worse for Ambisonics signals . For first order, the signals
are conventionally named W,X,Y,Z, in that order, and they need to be kept
together, just as the components of an RGB signal. For second order B-format
which uses 9 channels, the names are even no longer in alphabetical order.
Since jackd seems to maintain the creation order at least for clients
that create their ports once and never modify them afterwards (it would
probably take extra code to change that :-), I feel qjackctl should at
least offer the option to keep them in that order.
For clients that add and remove ports while running, a special API to
jackd should be defined to allow them to specify grouping and ordering
of ports. None of this should depend on a viewer, as it just doesn't
have the necessary info to get this right except maybe in some simple
cases.
-- FA
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