[pulseaudio-discuss] module-null-sink in master branch of git

[Nick Thompson]

Hiya,

I've been playing with modern releases of pulseaudio.

In release 0.9.12 on an arm embedded system, the cpu load went from  
around 12-16% to under 4%.

AWESOME!

But something seems broken with module-null-sink.

I looked at git and Lennert had a comment about teaching module-null- 
sink about rewinds.

Debugging is always easier on x86 so I tried a simple null sink there.

Logs of output are below.

Where should I start looking to address this?

Any clues or breadcrumbs gratefully received :)

Thanks

Nick






I checked out the "master" branch from git, built it and got the  
following message:

> nick at nick-desktop:~$ paplay --device=test_null_sink ~/Sony\ CD-ROM\  
> Test\ Disk\ Type\ 3.0/Cantibile-Op-17.wav
> Connection failure: Connection terminated
> Stream errror: Connection terminated

Looking at the output of pulseaudio's log I see the following...

> D: module-suspend-on-idle.c: Sink test_null_sink becomes busy.
> D: memblockq.c: memblockq requested: maxlength=33554432, tlength=0,  
> base=4, prebuf=0, minreq=1 maxrewind=0
> D: memblockq.c: memblockq sanitized: maxlength=33554432,  
> tlength=33554432, base=4, prebuf=0, minreq=4 maxrewind=0
> I: sink-input.c: Created input 0 "/home/nick/Sony CD-ROM Test Disk  
> Type 3.0/Cantibile-Op-17.wav" on test_null_sink with sample spec  
> s16le 2ch 44100Hz and channel map front-left,front-right
>
> I: protocol-native.c: Requested tlength=250.00 ms, minreq=20.00 ms
> D: protocol-native.c: Traditional mode enabled, modifying sink usec  
> only for compat with minreq.
> D: memblockq.c: memblockq requested: maxlength=4194304,  
> tlength=44100, base=4, prebuf=44100, minreq=3528 maxrewind=0
> D: memblockq.c: memblockq sanitized: maxlength=4194304,  
> tlength=44100, base=4, prebuf=44100, minreq=3528 maxrewind=0
> I: protocol-native.c: Final latency 460.00 ms = 210.00 ms + 2*20.00  
> ms + 210.00 ms
> D: protocol-native.c: Requesting rewind due to end of underrun.
> D: module-null-sink.c: Requested to rewind 352800 bytes.
> D: sink.c: Processing rewind...
> D: sink-input.c: Have to rewind 352800 bytes on render memblockq.
> D: module-null-sink.c: Rewound 352800 bytes.
> D: protocol-native.c: Requesting rewind due to end of underrun.
> D: module-null-sink.c: Requested to rewind 352800 bytes.
> D: sink.c: Processing rewind...
> D: sink-input.c: Have to rewind 40012 bytes on render memblockq.
> D: module-null-sink.c: Rewound 40012 bytes.
> D: protocol-native.c: Requesting rewind due to end of underrun.
> D: module-null-sink.c: Requested to rewind 352800 bytes.
> E: sink.c: Assertion '!s->thread_info.rewind_requested' failed at  
> pulsecore/sink.c:632, function pa_sink_render(). Aborting.
>
> Aborted
> nick at nick-desktop:~$

The pulseconfig is very simple for this test:

> load-module module-native-protocol-unix
>
> load-module module-null-sink sink_name=test_null_sink
>
>
> load-module module-alsa-sink device=usbLexiconAlpha sink_name=usbAudio
> load-module module-alsa-sink device=intelHDA sink_name=hdaAudio
> load-module module-alsa-source device=usbLexiconAlpha  
> source_name=usbAudioInput
> load-module module-alsa-source device=intelHDA  
> source_name=hdaAudioInput
>
> # default sinks/sources
> set-default-sink usbAudio
> set-default-source usbAudioInput
>
> load-module module-suspend-on-idle
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