[pulseaudio-tickets] [Bug 39360] Stereo/surround detection

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=39360

Colin Guthrie <fdo at colin.guthr.ie> changed:

           What    |Removed                     |Added
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                 CC|                            |fdo at colin.guthr.ie

--- Comment #1 from Colin Guthrie <fdo at colin.guthr.ie> 2011-07-19 12:05:28 PDT ---
Technically 'passthrough' modes are quite different from this and will be
supported in the 1.0 version of PA. This means that you can keep your receiver
set in a stereo mode, but when you have content that the receiver can decode
natively (e.g. ac3) then it will be passed verbatim to the receiver. This will
sadly mean that only that single stream can be played, but that's the trade-off
for passthrough!

However, when dealing with analog content, it may make sense to automatically
pick the right profile. However, this is a very complicated thing. e.g. on some
h/w enabling 5.1 output will disable input. There also is simply not the
metadata available to do this just now. We do not know from looking at profiles
how many channels there are on the sink or sinks created by activating that
profile.

So there are both conceptual and logistical problems with this approach. I
think it might make more sense to simply allow disabling of upmixing when
attaching at 2ch stream to a 6ch sink. That way you'd keep things in 6ch
profile all the time but let the receiver do the upmixing itself. WDYT?

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