Re: [Discuss-gnuradio] Audio sink busy / segfaults of WX FFT + WX Waterfall

[Stefan Gofferje]

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On 04/29/2011 12:48 PM, Tom Rondeau wrote:
> Shared access when using ALSA is definitely an issue. Your other
> programs are likely using some audio layer on top of ALSA, like
> portaudio. GNU Radio will try to use ALSA straight away, which can cause
> sharing issues. This is a long standing problem, and we've never had
> anybody spend the necessary time to work out a proper solution.

They shouldn't. SuSE comes with pulseaudio but it's buggy, so I
uninstalled it and changed all configs to use Alsa directly.

> I've never seen/heard of those guys segfaulting before. Can you provide
> the settings of the blocks you are using? I've used the FFT and
> Waterfall sinks directly connected to a USRP source (both UHD and the
> legacy interface) with no problems.

address@hidden:~> python top_block.py
Segmentation fault
address@hidden:~> cat top_block.py
#!/usr/bin/env python
##################################################
# Gnuradio Python Flow Graph
# Title: Top Block
# Generated: Fri Apr 29 12:56:39 2011
##################################################

from gnuradio import audio
from gnuradio import eng_notation
from gnuradio import gr
from gnuradio import window
from gnuradio.eng_option import eng_option
from gnuradio.gr import firdes
from gnuradio.wxgui import fftsink2
from grc_gnuradio import wxgui as grc_wxgui
from optparse import OptionParser
import wx

class top_block(grc_wxgui.top_block_gui):

        def __init__(self):
                grc_wxgui.top_block_gui.__init__(self, title="Top Block")

                ##################################################
                # Variables
                ##################################################
                self.samp_rate = samp_rate = 44100

                ##################################################
                # Blocks
                ##################################################
                self.wxgui_fftsink2_0 = fftsink2.fft_sink_f(
                        self.GetWin(),
                        baseband_freq=0,
                        y_per_div=10,
                        y_divs=10,
                        ref_level=50,
                        ref_scale=2.0,
                        sample_rate=samp_rate,
                        fft_size=1024,
                        fft_rate=30,
                        average=False,
                        avg_alpha=None,
                        title="FFT Plot",
                        peak_hold=False,
                )
                self.Add(self.wxgui_fftsink2_0.win)
                self.audio_source_0 = audio.source(samp_rate, "", True)

                ##################################################
                # Connections
                ##################################################
                self.connect((self.audio_source_0, 0),
(self.wxgui_fftsink2_0, 0))

        def get_samp_rate(self):
                return self.samp_rate

        def set_samp_rate(self, samp_rate):
                self.samp_rate = samp_rate
                self.wxgui_fftsink2_0.set_sample_rate(self.samp_rate)

if __name__ == '__main__':
        parser = OptionParser(option_class=eng_option, usage="%prog:
[options]")
        (options, args) = parser.parse_args()
        tb = top_block()
        tb.Run(True)


i remember doing this like 2y ago when I first started experimenting
with gnuradio and then it worked.

- -S


- -- 
 (o_   Stefan Gofferje            | SCLT, MCP, CCSA
 //\   Reg'd Linux User #247167   | VCP #2263
 V_/_  Heckler & Koch - the original point and click interface
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