On Thu, 11 Apr 2002, Takashi Iwai wrote:
> Hi Kasparek,
>
> > But for native ALSA recoding on frequency other that defined in card ends
> > with "arecord" saying everything is fine, but created file contains just
> > header. My driver is requested to capture on some near rate in this case.
>
> well, then it's a bug of alsa-lib.
> could you explain the symptom more precisely?
I have solved this yet. Original behavior (using "pcm.default") was:
- using rate supported by card -> mono and stereo capture works
- using non-standard rate -> just stereo works (that is native for the UDA
chip), for Mono "arecod" produces just 44bytes of header.
I solved this using own configuration:
pcm.h3600 {
type plug
slave {
pcm {
type hw
card 0
}
#format "S16_LE"
#channels 2
rate "unchanged"
}
}
I need to specify the "rate" line. Then resampling and mono <-> stereo
transformation works fine. I tried sample format conversion, but it does
work well just with my configuration too. (I tried S|U 16 LE|BE, MU_LAW)
The card is UDA1341TS on H3600 (iPAQ) - native support just for U16_LE,
stereo.
Weel, I would like to ask one more question: The chip sipport not only
16bit(LE) samples but 18 and 20 bits LE samples too. Would it be hard to
update ALSA to support these sample sizes? Where should I look for
informations when trying to get this running?
Bye
--
Tomas Kasparek (sioux, xkaspa06)
tomas.kasparek@[seznam.cz,volny.cz]
[EMAIL PROTECTED]
student FIT VUT Brno
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