[pulseaudio-discuss] Monitor devices and unconnected sources.

Knut-Håvard Aksnes kna at tirsdagsklubben.nu
Tue Oct 28 05:07:06 PDT 2008

Lennart Poettering wrote:
> On Fri, 24.10.08 12:39, Knut-Håvard Aksnes (kna at tirsdagsklubben.nu) wrote:
>> I am working on an application where I listen to monitor interfaces. The  
>> audio stream is intended to be merged with other AV streams later down  
>> the processing pipeline using third party code, (open source but quite  
>> complex to understand and modify). My problem is that the application  
>> connecting to the pulse audio monitor might or might not send audio,  
>> depending on user input, if it doesn't send audio it won't connect to  
>> the pulse audio source, the application might also disconnect the audio  
>> based on user input, before terminating itself. (Audio is handled by  
>> plugins that might get loaded and unloaded based on user input)
>> My problem is that I really need to receive silence (zero filled audio )  
>> instead of empty packages from the monitor interface when no sources is  
>> connected. Is it possible to configure pulse audio to give me this?
> A simple possibility is not to load module-suspend-on-idle. Only when
> an audio devcie is suspended you won't get any data from it.
At least on fedora 9 (running pulseaudio 0.9.10) this doesn't work.

An easy test is to unload the module-suspend-on-idle, then creating a 
null sink
then trying parec on this sinks monitor device without connecting a source.
The result is an empty file. What I need is a file growing with the same 
speed (pa_bytes_per_second per second) even when no applications are 
sending to the associated l sink.
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