[pulseaudio-discuss] [RFC PATCH 0/6] LFE filter

Raymond Yau superquad.vortex2 at gmail.com
Wed Feb 4 18:49:00 PST 2015

>> Hui and I have been working on some LFE filter patches lately, and this
>> is our first draft for review/feedback.
>> First, I have greedily stolen the math from CRAS, because CRAS is BSD and
>> as I understand we don't have a problem with merging more liberal
>> The LFE filter is implemented in the resampler, which means it is done
>> every sink-input rather than every sink - this might mean some additional
>> CPU processing if many different streams play back at the same time, but
>> putting it on the sink side would disable the possibility to mix a 2.0
>> with a 2.1 stream.
>> The rewind part is very drafty and untested, and I'm not sure I choose
>> best design here. But at least this is something that could act as base
>> discussion.
> Sorry for a possibly-stupid question, but...
> Which part of PulseAudio is supposed to disable the effect if the user
plugs headphones in? Or is it yet to be written?

As plug of headphone won't change profile , the headphone just get signal
without any bass ,

this is similar to plug headphone when playing 5.1

did pulseaudio automatically downmix 5.1 to stereo ?
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