Subject: Re: [linux-audio-dev] TiMidity as a CPU hog
From: Robert Jonsson (rj_AT_spamatica.se)
Date: Fri Jun 11 2004 - 14:10:17 EEST
Hi,
On Friday 11 June 2004 11.26, Jens M Andreasen wrote:
> Hi Dave, Takashi!
>
> I've got timidity up and running now, as a server under OSS. Made me
> self a new option to read directly from /dev/sequencer2 (The
> documentation says the input format should be similar to /dev/sequencer,
> but that's wrong.)
>
> The first note I play actually happens, and resembles an acoustic piano
> with a bit of wobbly reverb. So far so good ...
>
> The problem is that it stops rendering as soon as I release the note and
> then only renders when there is new midi-input (as in massaging the
> modulation wheel like a mad man ...). I have tried turning active
> sensing ON on my keyboard to no avail.
>
> Then I started to look further into the sources in search for the actual
> synthesizer. There is some 3MB of cross-platform C-code and headers, and
> most of it is not what I'm looking for.
>
> So far I have only localized the soundfont loader and I am currently
> reading up on the struct that defines the format. If I can find (or if
> you can help me find?) the parts that actually assigns and renders a
> note, then I should be able to write a new CPU-friendly voice-assigner
>
> The goal would be to pruduce something like a tmdt--. That is to say:
> Timidity++ unbloated, a module which only includes the stuff needed to
> run as a softsynth under Linux.
>
> So, where is the damned synthesizer? :)
It's in there! ;-}
Now, you might have already tried Fluidsynth, but I thought I would mention it
for completeness.
Fluidsynth is also a soundfont player which "might" be more aimed at realtime
synth.
It has it's own sets of problems though, none that really matter to me though,
I think it's an excellent synth.
/Robert
ps.
As for the CPU hogging, fluidsynth had a problem earlier when the reverb was
enabled. When there was little or none signal into the reverb it went totally
bonkers and consumed pretty much all cpu (a denormal problem I seem to
remember).
So the obvious question is, when timidity consumes all cpu, is the reverb
enabled?
ds.
>
> mvh // Jens M Andreasen
>
<...>
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