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
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
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