On Fri, Oct 16, 2015 at 9:08 AM, Max Kellermann <[email protected]> wrote:

>> 1. there is a room and willingness to accept such proposal
>
> It is impossible to judge your future proposal until one knows the
> proposal.  I, for one, have no idea what this is about.

You meant digital filters per se? They're fundamental to sound
reproduction, especially during D/A conversion. Most commercially
available DAC products employ them, although hide deep in ICs or
discrete ones. Even entry level chips like PCM512x/PCM5102 [1] offer
selection between two filters plus de-emphasis. In fact you can create
one on PC using SoX or similar, apply to data stream and then push to
ALSA for example. Another typical use case that you might find
relevant is digital room correction.

My aim is to create facilities for a basic filter management: list all
available filters (or filter sets) and select the current one. I think
it makes sense to include these to MPD protocol as digital filters
affect how sound is perceived by users no less than volume levels
(which are handled by MPD protocol already). And such extensions will
enable music players to simplify user experience.

[1] http://www.ti.com/lit/ds/symlink/pcm5102a-q1.pdf
-- 
Thanks,
Aleksander Trofimowicz
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