On 07/17/2011 06:19 PM, Alex DEKKER wrote:
Built GNUradio from git on Debian Testing AMD64 this afternoon, and
intending to use it with a Funcube Dongle and gr-fcd. I am having some
difficulty with the ALSA sink and an ICE1712 [M-Audio 2496] sound
card. I created a very simple flow graph with a sine wave Signal
Source straight in to an Audio Sink. When I try to execute it, I get:
Traceback (most recent call last):
File "/home/alex/downloads/radio/gr-fcd/apps/top_block.py", line
118, in <module>
tb.Run(True)
File
"/usr/local/lib/python2.6/dist-packages/grc_gnuradio/wxgui/top_block_gui.py",
line 72, in Run
if start: self.start()
File
"/usr/local/lib/python2.6/dist-packages/gnuradio/gr/top_block.py",
line 97, in start
self._tb.start()
File
"/usr/local/lib/python2.6/dist-packages/gnuradio/gr/gnuradio_core_runtime.py",
line 1480, in start
return _gnuradio_core_runtime.gr_top_block_sptr_start(self)
RuntimeError: audio_alsa_sink(3): insufficient connected input ports
(10 needed, 1 connected)
Done
I have connected an old USB sound card, which becomes hw:2,0 and
pointed it at that, and it works fine. So there seems to be some kind
of incompatibility between gnuradio and this sound card. Where is the
best place to start looking into what the issue might be?
alexd
So, the audio_alsa_sink.cc module queries the ALSA subsystem for the
min_chans that it offers, and configures the I/O configuration for
Gnu Radio accordingly. Near as I can tell, your reported error
indicates that the ALSA driver is reporting that the *minimum* number of
supported channels is 10, which is a bit odd. No, it's very odd. I
can imagine a card only supporting stereo input, and not mono. But
a minimum of *10" channels? That sounds like a bug in an ALSA driver
to me.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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