Problem with M5455 card

Problem with M5455 card

[Volker Schroer]

Hi,
I hope, this is the right list to post this question.
I'm porting an Ham- Radio application  from oss to alsa.
I'm using an ASROCK motherboard with on board sound and an AMD64 dual 
core. OS is gentoo linux , kernel 2.6.18, alsa-driver 1.0.13, alsa- lib 
1.0.13.

I set the card to FLOAT_LE format.
If I read the samples with snd_pcm_readi, I get invalid values ( 10*e34 
) from time to time, although  the result code of readi does not signal 
any errors.

Is there a way to check if the read values  are valid inside the driver 
? I think, there is a problem inside the driver. Using a delta 44 
soundcard, the problem is gone.

Thanks

Volker

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Re: Problem with M5455 card

[Takashi Iwai]

At Sun, 05 Nov 2006 10:23:58 +0100,
Volker Schroer wrote:
> 
> Hi,
> I hope, this is the right list to post this question.
> I'm porting an Ham- Radio application  from oss to alsa.
> I'm using an ASROCK motherboard with on board sound and an AMD64 dual 
> core. OS is gentoo linux , kernel 2.6.18, alsa-driver 1.0.13, alsa- lib 
> 1.0.13.
> 
> I set the card to FLOAT_LE format.

What did you set exactly?  Set hw_params calls with format = FLOAT_LE
from application? 


> If I read the samples with snd_pcm_readi, I get invalid values ( 10*e34 
> ) from time to time, although  the result code of readi does not signal 
> any errors.
> 
> Is there a way to check if the read values  are valid inside the driver 
> ? I think, there is a problem inside the driver. Using a delta 44 
> soundcard, the problem is gone.

I guess it's rather a conincidence that it worked with another card.
Or, possibly, conversion between S16 and float in alsa-lib plugin
might be broken.


Takashi

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Re: Problem with M5455 card

[Volker Schroer]

>> .
>>
>> I set the card to FLOAT_LE format.
>>     
>
> What did you set exactly?  Set hw_params calls with format = FLOAT_LE
> from application? 
>   
Yes, this is my .asoundrc
pcm.LinPSK_card {
        type hw
        card M5455
        }
pcm.LinPSK {
        type plug
        slave.pcm LinPSK_card
}
 and I open LinPSK.
>> If I read the samples with snd_pcm_readi, I get invalid values ( 10*e34 
>> ) from time to time, although  the result code of readi does not signal 
>> any errors.
>>
>> Is there a way to check if the read values  are valid inside the driver 
>> ? I think, there is a problem inside the driver. Using a delta 44 
>> soundcard, the problem is gone.
>>     
>
> I guess it's rather a conincidence that it worked with another card.
> Or, possibly, conversion between S16 and float in alsa-lib plugin
> might be broken.
>
>   
 Well, but not all samples contain bad values. Only after some times 
some bad values appear.


Volker


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Re: Problem with M5455 card

[Takashi Iwai]

At Mon, 06 Nov 2006 21:35:41 +0100,
Volker Schroer wrote:
> 
> 
> >> .
> >>
> >> I set the card to FLOAT_LE format.
> >>     
> >
> > What did you set exactly?  Set hw_params calls with format = FLOAT_LE
> > from application? 
> >   
> Yes, this is my .asoundrc
> pcm.LinPSK_card {
>         type hw
>         card M5455
>         }
> pcm.LinPSK {
>         type plug
>         slave.pcm LinPSK_card
> }
>  and I open LinPSK.
> >> If I read the samples with snd_pcm_readi, I get invalid values ( 10*e34 
> >> ) from time to time, although  the result code of readi does not signal 
> >> any errors.
> >>
> >> Is there a way to check if the read values  are valid inside the driver 
> >> ? I think, there is a problem inside the driver. Using a delta 44 
> >> soundcard, the problem is gone.
> >>     
> >
> > I guess it's rather a conincidence that it worked with another card.
> > Or, possibly, conversion between S16 and float in alsa-lib plugin
> > might be broken.
> >
> >   
>  Well, but not all samples contain bad values. Only after some times 
> some bad values appear.

Hm, then the problem could be in the rate conversion.
M5455 uses only 48kHz (by some reason).  Try to run with 48kHz.


Takashi

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Re: Problem with M5455 card

[Volker Schroer]

Takashi Iwai schrieb:
>>>>     
>>>>         
>>> I guess it's rather a conincidence that it worked with another card.
>>> Or, possibly, conversion between S16 and float in alsa-lib plugin
>>> might be broken.
>>>
>>>   
>>>       
>>  Well, but not all samples contain bad values. Only after some times 
>> some bad values appear.
>>     
>
> Hm, then the problem could be in the rate conversion.
> M5455 uses only 48kHz (by some reason).  Try to run with 48kHz.
>
>
>   

I did that, but no change. Only the size of the bad valus gets smaller  
(about 10e*16).

Volker
>
>   


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