Hi Max,

I need your help on a design decision regarding filters and mixer.. 

Regarding filters.. 

Two ideas (maybe you have a third?):

1. Bypass the filters by modifying output_thread.c and implement a 'bypass 
filter' mode. This means that when pure DSD playback is requested 
output_thread.c will first do an ao_open in bypass filter mode (filter code 
will not be called..). When the output_plugin doesn't support native DSD it 
will automatically revert to the ao_reopen call which re-enabled the filters. 


2. Modifying filters individually. For this implementations should probably be 
discussed individually (for ex. how to deal with replay_gain_filter_plugin.c 
which seems to be most intrusive and is created on startup, etc..). 

What do you prefer and or propose?

As the dsd2pcm code needs to remain state I also propose to implement dsd2pcm 
into the convert_filter_plugin. Do you agree?


Mixers/Volume control.. I think we somehow need to be able to disable software 
(maybe also hardware) volume control. Would you agree? I currently have no 
proposal other than adding enable/disable state code to volume.c for a clean 
implementation. What are your thoughts on this?

Thanks!

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