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Re: [Discuss-gnuradio] Increasing ALSA Sampling Rate

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Increasing ALSA Sampling Rate
Date: Mon, 31 Jan 2011 16:22:22 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10

On 01/31/2011 01:10 PM, George S. Williams wrote:
> Hey, Tom,
> Thanks for the reply. I'm not sure that it's entirely an ALSA problem.
> Both my aplay and snd-bt88x are patched to allow 1792000. If I do-
> arecord -D hw:1,1 -r 1792000 -f S16_LE -t wav -d 5 test0.wav

audio_alsa_source[hw:2,1]: get_period_size failed: Invalid argument

I think the clue is in the above.

It looks like the device-specific driver for this hardware doesn't contain the 
"PERIOD_SIZE" parameter
  in the configuration description for the hardware, and Gnu Radio uses that 
information for buffer
  planning purposes (using it for set_output_multiple() ).  Not clear whether 
there's a fix or not, and
  whether the fix belongs in Alsa or Gnu Radio.


Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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