On Mon, Jan 31, 2011 at 1:10 PM, George S. Williams <r...@websterling.com> 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 > > I get- > Recording WAVE 'test0.wav' : Signed 16 bit Little Endian, Rate 1792000 Hz, > Mono > > And- soxi reports- > Input File : 'test0.wav' > Channels : 1 > Sample Rate : 1.792e+06 > Precision : 16-bit > Duration : 00:00:05.00 = 8960000 samples ~ 375 CDDA sectors > Sample Encoding: 16-bit Signed Integer PCM > > So it looks to me like ALSA recorded at 1792000. > > Wish I knew more about ALSA and gnuradio- probably will before it's over. > > George
Ok, gotcha. Then I'll reword what I said; it must be a problem with how we are using ALSA :) Like I said, though, this is not my area of expertise, so I'm hoping someone else with more knowledge of the ALSA API can help out. Tom > On 1/31/2011 10:30 AM, Tom Rondeau wrote: >> >> 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 >> >> >> >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com >> Version: 9.0.872 / Virus Database: 271.1.1/3414 - Release Date: 01/31/11 >> 02:34:00 >> > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
