snd_pcm_open fails with -16 error

snd_pcm_open fails with -16 error

[irfan shaikh]

Hello All,

A)
               In my application i am closing and reopening my device to
configure some hw_params for audio frequency change.
Close of PCM device is success, but reopen the same device fails

I get an below error
snd_pcm_open() FAIL with return value -16 {Device or resource busy}

How can i avoid above error. {I tried putting usleep between open and
close but doesn't work for me}


B)

I have even tried to configure the HW params in run time to avoid above
closing and opening of device.
But run time HW params configuartion failed.
Is there any way to change HW params at run time ? {My PCM device are in
RUNNING state and i want to change HW params at run time}


Thanks and regards,
Irfan



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Re: snd_pcm_open fails with -16 error

[Clemens Ladisch]

irfan shaikh wrote:
>                In my application i am closing and reopening my device to
> configure some hw_params for audio frequency change.

You should just set new hw_params on the same device.

> Close of PCM device is success, but reopen the same device fails
> 
> I get an below error
> snd_pcm_open() FAIL with return value -16 {Device or resource busy}

IIRC this could happen when using dmix on some old alsa-lib version.

> I have even tried to configure the HW params in run time to avoid above
> closing and opening of device.
> But run time HW params configuartion failed.

Thank you very much for keeping the error code a secret.

> Is there any way to change HW params at run time ? {My PCM device are in
> RUNNING state and i want to change HW params at run time}

Stop the device first.


Regards,
Clemens


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