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.htm.... 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

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.htm.... 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