[pulseaudio-discuss] [PATCH v2] pipe-source: suspend source when no writers connected to fifo

Raman Shuishniou rommer at ibuffed.com
Sat Feb 10 21:25:34 UTC 2018

10.02.2018 23:59, Georg Chini пишет:
> On 08.02.2018 17:58, Raman Shyshniou wrote:
>>      Make pipe-source suspended if all writers closed fifo.
>>      Source will be automatically unsuspended if any data will
>>      be written to pipe and suspended again when last writer
>>      closed fifo.
>> ---
>>   src/modules/module-pipe-source.c | 114 
>> +++++++++++++++++++++++++++++++++++++--
>>   1 file changed, 109 insertions(+), 5 deletions(-)
> What is the motivation/use case for the patch? Normally, if there
> are no writers, the source should deliver silence like any other
> source without input signal.

pipe-source module can't generate silence if no writers connected
because it has no clock. Aactually incoming data has some clock, but
not pipe-source itself. Use the system clock to generate silence
is a bad idea because it may differ from incoming data clock.

For example the loopback module connected to pipe-source without
writers just spams messages like this:
[alsa-sink-USB Audio] module-loopback.c: Could not peek into queue

I can make autosuspend behaviour optional.

> Regards
>               Georg


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