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

[Jiri Pittner]

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__
    self._BootstrapApp()
  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.
Jiri


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 
> > applications
> > would determine the audio rates automatically.
>
>
> Use the following option   "-O plughw:0.0"
>
> That tells alsa to use its own resampler.
>
> Matt