Subject: Re: [linux-audio-dev] Fragment size question.
From: Iain Sandoe (iain_AT_sandoe.co.uk)
Date: Sat Sep 16 2000 - 00:20:46 EEST
> Ah, so you are in fact emulating AFMT_U8, right ?
Yep. (well, actually, all AFMTs but ADPCM).
> In that case I would report back 8bits and a fragsize of 256
> and the number of frags (-1 to comply with the OSS/Free bug),
> the user requested.
That would be my inclination - it's just not what the driver does right now
- hence the question.
> But I don't think AFMT_U8 is THAT important to get emulated,
> since most apps (which one does not ?) support the 16bit mode.
> (the OSS specs does not seem to require the support of certain
> audio bit sizes)
Some people still want it :-/
(I had at least one who wanted to record to 8 bit MU-law - which I'm _not_
supporting as it happens - although the driver can if someone wants to write
the translation).
> Is that still the famous Mac HW audio driver ?
:-) yep. been busy with other stuff - just got back to it.
> (just for curiousity: is it usable for decent audio (at least comparable to
> a good 16bit PC audio card ?)
That depends on what you mean by "good".
With the kind of consumer, games etc. PCI cards - certainly (in fact a good
deal better in terms of extraneous/cross-talk noise than a lot).
You can wack the studio monitors up and move the mouse without being
deafened ;-) [try it sometime on a dell.... but don't turn the volume
toooooo high]
for more serious stuff...
There are several versions of the chips. There's an 18 bit set which has
quite good specs (but only really appears on the "AV" standard machines and
some of the newer portables). You get proper audio connectors & so on with
those solutions.
The 'standard' set is 16 bit. Comparable, useful for "OK" stuff - certainly
for monitoring - but no substitute for an optical link and outboard
converters. Not enough channels (2), no WORD-CLK and max SR (on *nearly*
all models) of 44.1k.
Very useful for composing away from home - as good as any portable solution
for ideas jotting.
A G3(4 soon?) portable could make a quite neat stereo effects proc. I
figure on getting the latency down to the minimum that the hardware will
support (AFAICT about 12 ms) which IMHO should be OK for live (gig) use.
> PS: I'm just printing out intel's FPU manuals ... guess why ? :-))
You have, as always, my sympathy - happy stacking.... ;-))))))
ciao,
Iain.
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