21 Jul
2013
21 Jul
'13
3:14 p.m.
Fons Adriaensen <fons(a)linuxaudio.org> a écrit :
Resampling means 'computing samples for another
sample rate', and not
'changing the sample format'.
I thought that the sample format was the sample depth plus the sample
rate, but sample format and sample depth are the same. Definitions are
important.
Neat trick, but if it works you are just lucky.
Gee. I just finished my script, and it works.
** There is no defined order when Jack provides a list
of ports. **
What?? Now... Heinseberg law applying to Jack... :-)
In most cases, Jack will list them in the order they
were created,
but you can't count on that.
I might just count on that. I like being lucky. :-)
The only way to obtain a defined order is by
interpreting the port
names, which is what e.g. Qjackctl does: it does a lexicographical
sort. Which is why it will show Ambdec's ports as 0w, 1x, 1y, 1z.
AFAIK, mplayer doesn't do that.
Isn't Qjackctl just a wrapper (or controller) for jackd? Qjackctl shows
the ports in a different (lexicographical) order, but the order does
not change when starting jackd with Qjackctl.
> Now my problem is to connect mplayer to a second
instance of
> ambdec;
I'll try to use the aloop devices instead of mangling the channels
order with a bash script to create a remapping string for Mplayer. I
should be able to script the connections between the ambdec decoders and
the aloop devices, in order to use MPlayer with ALSA instead of Jack.
I need it for lower frequencies, and since I use a
triangle
Nice! I'll fix my triangle decoder; it's cheaper than replacing all
my satellite speakers with full-range speakers, only for frequencies
below 120Hz.
(for basic horizontal decoding), I had to change
the lower limit
for the number of allowed channels in the source code of ambdec.
There's no need to do that, just set the matrix coefficients for the
4th channel to zero. When Ambdec gets extended to 4th degree (order) and
higher, it will also use ACN in the port names - there are
no FuMA names for those. The only alternative would be to
use port names that explicitly contain L and M.
I doubt I'll be using 4th degree anytime soon (my listening room is
very small), but there might be a need to create a new amb format using
the ACN ordering instead of the FuMA ordering. Or does it already
exists?
--
Marc