On Thu, Jan 27, 2011 at 11:38 AM, George S. Williams <r...@websterling.com> wrote: > 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
George, It appears that this error is occurring in the ALSA asound library itself (see line 205 of gr-audio-alsa/src/audio_alsa_source.cc). I haven't spent much time looking around the alsa implementation, so I can't say for certain, but this appears to be a problem with ALSA, not GNU Radio. Hopefully, someone else with much more knowledge about ALSA and it's capabilities can tell you better. Tom _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
