Re: [Discuss-gnuradio] Increasing ALSA Sampling Rate

On 1/31/2011 4:22 PM, Marcus D. Leech wrote:
>
> 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.
>

Would this keep Gnu Radio from using the card at 1792000 but still allow
896000?

Using this in config.conf
[audio_alsa]
verbose = true

And setting samp_rate to 896000

GRC returns this-
PCM name: hw:1,1
Access types:
MMAP_INTERLEAVED YES
MMAP_NONINTERLEAVED NO
MMAP_COMPLEX NO
RW_INTERLEAVED YES
RW_NONINTERLEAVED NO
Formats:
S8 YES
S16_LE YES
Number of channels
min channels: 1
max channels: 1
1 channels YES
Sample Rates:
min rate: 119466 (dir = 1)
max rate: 1792000 (dir = 0)
8000 NO
16000 NO
22050 NO
32000 NO
44100 NO
48000 NO
96000 NO
192000 NO

So I would think that Gnu Radio should know about the higher rate?? The
flowgraph does execute at 896000.

But, if I set samp_rate to 1792000, I get the get_period_size failed:
Invalid argument error.

Just trying to understand this stuff- still in the steep part of the
learning curve.

George

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