[pulseaudio-discuss] Detecting when data source disappears?

Georg Chini georg at chini.tk
Sun May 28 09:29:08 UTC 2017

On 23.05.2017 03:44, Steven Wawryk wrote:
> Sorry about reposting.  I botched up the subject line, messing up the 
> threading.
>>>>> I've been reading up and experimenting on both the simple and async
>>>>> APIs.  In one experiment, I used a CLI file that sets up a set of
>>>>> module-sine modules with output remapped by module-remap-sink modules
>>>>> to a stream fed to a module-null-sink module.
>> Could you please include the command sequence you are using? Maybe I can
>> reproduce the problem here.
> I've attached the CLI file and the shell script I use to run it. The 
> sequence is:
> ./restart-pulse.sh dist/data/sine-2x6.pa
> parec --device="test_sink0.monitor" --format=ulaw --rate=8000 
> --channels=6 --channel-map="aux0,aux1,aux2,aux3,aux4,aux5" parec0.raw
> Wait 10 seconds, then in another terminal:
> pactl unload-module module-remap-sink # or pactl unload-module 
> module-sine
> Wait another 10 seconds, then kill parec with ctrl-c.  I then look at 
> parec0.raw by importing it in audacity (u-law, 6channels, 8000 smp/sec).

I tested it here. To me it looks like a bug that occurs because of 
re-winding and using
a monitor source, but I can't put my finger on it yet.
With your setup, you are running with 2 seconds latency, which is 
probably not what
you intend. Add --latency-msec=10 or similar to your parec command. This 
mostly hide the bug.

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