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Re: [Discuss-gnuradio] audio card sampling rate problem

From: Jiri Pittner
Subject: Re: [Discuss-gnuradio] audio card sampling rate problem
Date: Wed, 4 Jul 2007 22:58:27 +0200 (CEST)

I get an error with that:

|jp:/home/jiri/pokusy/gnuradio/examples/python/usrp> ./usrp_wfm_rcv_pll.py -R B 
-f 98.7e6 -O plughw:0.0
gr_fir_ccf: using SSE
gr_fir_fff: using SSE
gr_fir_fcc: using SSE
ALSA lib pcm_hw.c:1351:(_snd_pcm_hw_open) Invalid value for card
audio_alsa_sink[plughw:0.0]: No such device
Traceback (most recent call last):
  File "./usrp_wfm_rcv_pll.py", line 325, in ?
    app = stdgui.stdapp (wfm_rx_graph, "USRP WFM RX")
File "/usr/local/lib/python2.4/site-packages/gnuradio/wxgui/stdgui.py", line 36, in __init__
    wx.App.__init__ (self, redirect=False)
File "/usr/lib/python2.4/site-packages/wx-2.6-gtk2-unicode/wx/_core.py", line 7700, in __init__
File "/usr/lib/python2.4/site-packages/wx-2.6-gtk2-unicode/wx/_core.py", line 7352, in _BootstrapApp
    return _core_.PyApp__BootstrapApp(*args, **kwargs)
File "/usr/local/lib/python2.4/site-packages/gnuradio/wxgui/stdgui.py", line 39, in OnInit
    frame = stdframe (self.flow_graph_maker, self.title, self._nstatus)
File "/usr/local/lib/python2.4/site-packages/gnuradio/wxgui/stdgui.py", line 60, in __init__
    self.panel = stdpanel (self, self, flow_graph_maker)
File "/usr/local/lib/python2.4/site-packages/gnuradio/wxgui/stdgui.py", line 81, in __init__
    self.fg = flow_graph_maker (frame, self, vbox, sys.argv)
  File "./usrp_wfm_rcv_pll.py", line 99, in __init__
    False)   # ok_to_block
File "/usr/local/lib/python2.4/site-packages/gnuradio/audio_alsa.py", line 236, in sink
    return _audio_alsa.sink(*args)
RuntimeError: audio_alsa_sink

I am using alsa 1.0.14a-r1 and kernel 2.6.21-gentoo.

On Wed, 4 Jul 2007, Matt Ettus wrote:

Jiri Pittner wrote:
Hi all,

I have been experienting with gnuradio for some time and I have noticed an 
annoying problem
with the audio sampling rate: in the scripts from the example directory it is 
set to a hard
value of 32ksamples/s. However, my laptop audio card (or its linux driver) do 
not support
this speed, only 44100 or 48000. So when updating to scripts from new gnuradio 
source it is
always necessary to adapt the values in the scripts. Is there some way how to 
ask the alsa
system about supported audio sampling rates from within a python script? I 
guess there can
be more users with such limitations and it would be nice if the final gnuradio 
would determine the audio rates automatically.

Use the following option   "-O plughw:0.0"

That tells alsa to use its own resampler.


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