[Discuss-gnuradio] Increasing ALSA Sampling Rate

[George S. Williams]

Is it possible to increase the maximum sampling rate for audio_alsa?

I am experimenting with using a modified TV tuner card as an ADC. The 
card uses a Bt878a chipset. arecord can record from the card at 1972000 
rate and GRC shows the maximum rate as 1972000, but GNUradio can only 
sample at 896000.

Running GNUradio at 1972000 rate gives the following error-


audio_alsa_source[hw:2,1]: get_period_size failed: Invalid argument
Traceback (most recent call last):
  File "/root/top_block.py", line 81, in <module>
    tb = top_block()
  File "/root/top_block.py", line 49, in __init__
    self.audio_source_0 = audio.source(samp_rate, "hw:2,1", True)
  File "/usr/local/lib/python2.6/site-packages/gnuradio/audio_alsa.py", 
line 241, in source
    return _audio_alsa.source(*args, **kwargs)
RuntimeError: audio_alsa_source


Is there some setting change that can enable the 1792000 rate?

Thanks,
George