[alsa-devel] PandaBoard ES Audio Problems

[Peter Ujfalusi]

Hi,

On 01/31/2013 05:51 PM, Brent Weatherall wrote:

> Here is a log of the high level test program:
> 
> snd_pcm_hw_params_set_rate_near succeeded.
> Rate set to 44100.
> snd_pcm_hw_params_set_channels succeeded.
> cannot set buffer time (Invalid argument)
> cannot set buffer period time (Invalid argument)
> Before commit, state is: SND_PCM_STATE_OPEN
> cannot set parameters (Invalid argument)
> After failure, state is: SND_PCM_STATE_OPEN
> Trying to re-configure rate param.
> Before calling 'snd_pcm_drop', state is: SND_PCM_STATE_OPEN
> cannot drop (Input/output error)
> After calling 'snd_pcm_drop', state is: SND_PCM_STATE_OPEN
> Trying rate 8000.
> snd_pcm_hw_params_set_rate_near succeeded.
> Rate set to 44100.
> snd_pcm_hw_params_set_buffer_time_near succeeded.
> Buffer size actually set to 22050.
> cannot set buffer period time (Invalid argument)
> cannot set parameters (Invalid argument)
> cannot prepare audio interface for use (Input/output error)
> Rate 44100 supported: FAIL

Which PCM you are opening? My guess is pcm0 which supports 44.1 and 48. You
seams to be failing with the period size here.
I know we have constraint for the period size, but can not recall what it is
and why it has not been applied to the stream.
Sebastien: can you comment?

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