snd_pcm_link : Function not implemented

snd_pcm_link : Function not implemented

[ashwanik]

Hi All,

I have download and compile latency.c application from 
http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2latency_8c-example.html.  
This application is  working fine on  Linux PC.
But when I am using this application on my omap4 board(using 
ubuntu10.10) is not working.

I am getting"Streams link error: Function not implemented" error. I 
debug the application and found this error coming from the 
*snd_pcm_link* function.
I am using ALSA Driver Version 1.0.23.


please find pointers.

Thanks in Advance
Ashwani

snd_pcm_link:Function not implemented

[ashwanik]

Hi All,

I have download and compile latency.c application from 
http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2latency_8c-example.html.  
This application is  working fine on  Linux PC.
But when I am using this application on my omap4 board(using 
ubuntu10.10) is not working.

I am getting"Streams link error: Function not implemented" error. I 
debug the application and found this error coming from the 
*snd_pcm_link* function.
I am using ALSA Driver Version 1.0.23.


please find pointers.

Thanks in Advance
Ashwani

Re: snd_pcm_link : Function not implemented

[Ashwani Kumar]

ashwanik <ashwani.kumar <at> freesystems.biz> writes:

> 
> Hi All,
> 
> I have download and compile latency.c application from 
> http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2latency_8c-example.html.  
> This application is  working fine on  Linux PC.
> But when I am using this application on my omap4 board(using 
> ubuntu10.10) is not working.
> 
> I am getting"Streams link error: Function not implemented" error. I 
> debug the application and found this error coming from the 
> *snd_pcm_link* function.
> I am using ALSA Driver Version 1.0.23.
> 
> please find pointers.
> 
> Thanks in Advance
> Ashwani
> 
> 

Hi,
Bringing to Top ,anyone faced similar problem of "snd_pcm_link" returning error
val=-38 and prints "Streams link error: Function not implemented".

Thanks in advance

Regards
Ashwani.

Re: snd_pcm_link : Function not implemented

[Takashi Iwai]

At Wed, 15 Jun 2011 05:50:29 +0000 (UTC),
Ashwani Kumar wrote:
> 
> ashwanik <ashwani.kumar <at> freesystems.biz> writes:
> 
> > 
> > Hi All,
> > 
> > I have download and compile latency.c application from 
> > http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2latency_8c-example.html.  
> > This application is  working fine on  Linux PC.
> > But when I am using this application on my omap4 board(using 
> > ubuntu10.10) is not working.
> > 
> > I am getting"Streams link error: Function not implemented" error. I 
> > debug the application and found this error coming from the 
> > *snd_pcm_link* function.
> > I am using ALSA Driver Version 1.0.23.
> > 
> > please find pointers.
> > 
> > Thanks in Advance
> > Ashwani
> > 
> > 
> 
> Hi,
> Bringing to Top ,anyone faced similar problem of "snd_pcm_link" returning error
> val=-38 and prints "Streams link error: Function not implemented".

I don't know of such a problem.  Better to check what went wrong via
strace or such.


Takashi

Re: snd_pcm_link : Function not implemented

[ashwanik]

On Thursday 16 June 2011 04:13 PM, Takashi Iwai wrote:
> At Wed, 15 Jun 2011 05:50:29 +0000 (UTC),
> Ashwani Kumar wrote:
>> ashwanik<ashwani.kumar<at>  freesystems.biz>  writes:
>>
>>> Hi All,
>>>
>>> I have download and compile latency.c application from
>>> http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2latency_8c-example.html.
>>> This application is  working fine on  Linux PC.
>>> But when I am using this application on my omap4 board(using
>>> ubuntu10.10) is not working.
>>>
>>> I am getting"Streams link error: Function not implemented" error. I
>>> debug the application and found this error coming from the
>>> *snd_pcm_link* function.
>>> I am using ALSA Driver Version 1.0.23.
>>>
>>> please find pointers.
>>>
>>> Thanks in Advance
>>> Ashwani
>>>
>>>
>> Hi,
>> Bringing to Top ,anyone faced similar problem of "snd_pcm_link" returning error
>> val=-38 and prints "Streams link error: Function not implemented".
> I don't know of such a problem.  Better to check what went wrong via
> strace or such.
>
>
> Takashi
Thanks for your reply,

I left that application(latency.c).
now i have merged alsa playback and capture application and thats 
working with following issue on omap4 board:
 > when i am executing this apps getting "underrun occurred" error
 > CPU consumption very high 22 - 27%.

please help to sort-out above problems.

Thanks in advance
Ashwani

Re: snd_pcm_link : Function not implemented

[Takashi Iwai]

At Thu, 16 Jun 2011 16:39:04 +0530,
ashwanik wrote:
> 
> 
> 
> 
> On Thursday 16 June 2011 04:13 PM, Takashi Iwai wrote:
> > At Wed, 15 Jun 2011 05:50:29 +0000 (UTC),
> > Ashwani Kumar wrote:
> >> ashwanik<ashwani.kumar<at>  freesystems.biz>  writes:
> >>
> >>> Hi All,
> >>>
> >>> I have download and compile latency.c application from
> >>> http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2latency_8c-example.html.
> >>> This application is  working fine on  Linux PC.
> >>> But when I am using this application on my omap4 board(using
> >>> ubuntu10.10) is not working.
> >>>
> >>> I am getting"Streams link error: Function not implemented" error. I
> >>> debug the application and found this error coming from the
> >>> *snd_pcm_link* function.
> >>> I am using ALSA Driver Version 1.0.23.
> >>>
> >>> please find pointers.
> >>>
> >>> Thanks in Advance
> >>> Ashwani
> >>>
> >>>
> >> Hi,
> >> Bringing to Top ,anyone faced similar problem of "snd_pcm_link" returning error
> >> val=-38 and prints "Streams link error: Function not implemented".
> > I don't know of such a problem.  Better to check what went wrong via
> > strace or such.
> >
> >
> > Takashi
> Thanks for your reply,
> 
> I left that application(latency.c).
> now i have merged alsa playback and capture application and thats 
> working with following issue on omap4 board:
>  > when i am executing this apps getting "underrun occurred" error

This is usually a driver issue.

>  > CPU consumption very high 22 - 27%.

This is normal.  It's a sort of stress-test, after all.


Takashi

Re: snd_pcm_link : Function not implemented

[ashwanik]

On Thursday 16 June 2011 05:06 PM, Takashi Iwai wrote:
> At Thu, 16 Jun 2011 16:39:04 +0530,
> ashwanik wrote:
>>
>>
>>
>> On Thursday 16 June 2011 04:13 PM, Takashi Iwai wrote:
>>> At Wed, 15 Jun 2011 05:50:29 +0000 (UTC),
>>> Ashwani Kumar wrote:
>>>> ashwanik<ashwani.kumar<at>   freesystems.biz>   writes:
>>>>
>>>>> Hi All,
>>>>>
>>>>> I have download and compile latency.c application from
>>>>> http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2latency_8c-example.html.
>>>>> This application is  working fine on  Linux PC.
>>>>> But when I am using this application on my omap4 board(using
>>>>> ubuntu10.10) is not working.
>>>>>
>>>>> I am getting"Streams link error: Function not implemented" error. I
>>>>> debug the application and found this error coming from the
>>>>> *snd_pcm_link* function.
>>>>> I am using ALSA Driver Version 1.0.23.
>>>>>
>>>>> please find pointers.
>>>>>
>>>>> Thanks in Advance
>>>>> Ashwani
>>>>>
>>>>>
>>>> Hi,
>>>> Bringing to Top ,anyone faced similar problem of "snd_pcm_link" returning error
>>>> val=-38 and prints "Streams link error: Function not implemented".
>>> I don't know of such a problem.  Better to check what went wrong via
>>> strace or such.
>>>
>>>
>>> Takashi
>> Thanks for your reply,
>>
>> I left that application(latency.c).
>> now i have merged alsa playback and capture application and thats
>> working with following issue on omap4 board:
>>   >  when i am executing this apps getting "underrun occurred" error
> This is usually a driver issue.
>
>>   >  CPU consumption very high 22 - 27%.
> This is normal.  It's a sort of stress-test, after all.
>
>
> Takashi
Thanks takashi.

I tried to reduce cpu consumption by simple capture & playback 
application but no success.

In my capture & playback application set sample rate to 44100 bits/sec. 
looking alsa mix upsample the 44100 rate to 48000 bits/sec. I tried to 
change defaults.pcm.dmix.rate 44100 in alsa.conf but this change doesn't 
reflected in /proc/asound/card0/pcm0c/sub0/hw_params .

access: MMAP_INTERLEAVED
format: S32_LE
subformat: STD
channels: 2
rate: 48000 (48000/1)
period_size: 35
buffer_size: 6720

Please suggest me how to change hw_params.


Thanks in Advance
Ashwani