Hi Rick, glad you got it to work, but really, your GNU Radio audio sink shouldn't use OSS (which only exists as emulation layer atop of ALSA since more than ten years, I think), when you don't put anything in the device field :)
Best regards, Marcus On 15.08.20 04:53, aardric wrote: > Wow. I didn't expect such a quick response; thank you all. > I noticed an option in the /etc/sysconfig/sound file: > # Load OSS-emulation modules at boot-up? (yes/no) > # OSS-emulation modules are needed if you use OSS applications > # with ALSA drivers. This option specifies whether these modules are > # loaded at boot-time. > # > LOAD_OSS_EMUL_MODULES="yes" > > For shits and giggles, I enabled it and found /dsp and /audio directories > appeared after I next restarted the system. > After this, /dsp, /audio and blank work in the device field of the audio > sink. The audio sink now works as well as > pulse audio (so system not broken for general use). The KDE pulse audio > controls work with the audio sink although > pavucontrol& does not (audio sink reports error: "audio_oss_sink: > /dev/audio: Device or resource busy"). I don't > require pavucontrol so long as the KDE audio controls work. > Running aplay -L shows no change from before. > So I am happy to consider this resolved and no long a diversion from other > aspects of gnuradio. > Perhaps in a couple of months I will be able to contribute something useful > to the project. > > cheers, > Rick > >>> Date: Fri, 14 Aug 2020 13:50:51 +0200 >>> From: Marcus Müller >>> [<[email protected]>](mailto:[email protected]) >>> To: >>> [<[email protected]>](mailto:[email protected]) >>> Subject: Re: audio sink RuntimeError: audio_oss_sink >>> Message-ID: >>> [<[email protected]>](mailto:[email protected]) >>> Content-Type: text/plain; charset="utf-8" >>> >>> Hi Rick, >>> >>> does it work when you put nothing in the device field? (because that >>> should select the default audio architecture, ALSA in your case, and use >>> the default device, which would be Pulse Audio sitting behind "default".) >>> Using "sysdefault" can normally fail, since that might not be a >>> shareable device. "default" is really what you'd normally be going for. >>> A program I like to use to see which programs use Pulseaudio, natively >>> or through the "default" ALSA device, by the way, is `pavucontrol`. >>> >>> Best regards, >>> Marcus >>> >>> On 14.08.20 00:27, aardric wrote: >>> >>>> Hail, >>>> >>>> I am introducing myself to SDR technology and gnuradio through >>>> whatever project documentation I find, dissecting the code and executing >>>> simple experimental flow graphs to test understanding of concepts, >>>> hoping to avoid forum queries (this is my first). Although the audio >>>> sink is not critical to my ultimate use of gnuradio and a bit of a >>>> diversion I will eventually start digging into it. However, I thought to >>>> submit a query on whether there is something obvious I should try in >>>> order to get it working. I am using gnu radio companion 3.8.1.0 (Python >>>> 3.6.10) and feeding the audio sink with a 1 kHz tone from the signal >>>> source block. >>>> >>>> (1) staring with: >>>> :~> aplay -L >>>> null >>>> Discard all samples (playback) or generate zero samples (capture) >>>> default >>>> Default ALSA Output (currently PulseAudio Sound Server) >>>> sysdefault:CARD=PCH >>>> HDA Intel PCH, ALC892 Analog >>>> Default Audio Device >>>> front:CARD=PCH,DEV=0 >>>> HDA Intel PCH, ALC892 Analog >>>> Front speakers >>>> surround21:CARD=PCH,DEV=0 >>>> HDA Intel PCH, ALC892 Analog >>>> 2.1 Surround output to Front and Subwoofer speakers >>>> (...) >>>> hdmi:CARD=PCH,DEV=0 >>>> HDA Intel PCH, HDMI 0 >>>> HDMI Audio Output >>>> hdmi:CARD=PCH,DEV=1 >>>> HDA Intel PCH, HDMI 1 >>>> HDMI Audio Output >>>> hdmi:CARD=PCH,DEV=2 >>>> HDA Intel PCH, HDMI 2 >>>> HDMI Audio Output >>>> hdmi:CARD=PCH,DEV=3 >>>> HDA Intel PCH, HDMI 3 >>>> HDMI Audio Output >>>> hdmi:CARD=PCH,DEV=4 >>>> HDA Intel PCH, HDMI 4 >>>> HDMI Audio Output >>>> >>>> (2) using sysdefault:CARD=PCH for the audio sink device name, >>>> both 44.1 kS/s and 48 kS/s the following runtime error results: >>>> >>>> (3) >>>> gr::log :INFO: audio source - Audio sink arch: oss >>>> audio_oss_sink: sysdefault:CARD=PCH: No such file or directory >>>> Traceback (most recent call last): >>>> File "/gnuradio/examples/audiotest.py", line 136, in <module> >>>> main() >>>> File "/gnuradio/examples/audiotest.py", line 112, in main >>>> tb = top_block_cls() >>>> File "/gnuradio/examples/audiotest.py", line 78, in __init__ >>>> self.audio_sink_0 = audio.sink(samp_rate, 'sysdefault:CARD=PCH', True) >>>> File >>>> "/usr/local/lib64/python3.6/site-packages/gnuradio/audio/audio_swig.py", >>>> line 220, in make >>>> return _audio_swig.sink_make(*args, **kwargs) >>>> RuntimeError: audio_oss_sink >>>> >>>> >>> Done (return code 1) >>>> >>>> (4) Fixing this isn't critical and in time I will get to the bottom of >>>> it; the forum query just removes the possibility of an obvious answer >>>> that most everyone else knows about. My guess is that I have to disable >>>> the Pulse audio server. >>>> >>>> Rick
