[MPlayer-dev-eng] Audio question: stereo sound to 6 channel sound plugin
Stephen Davies
steve at daviesfam.org
Thu Mar 14 13:24:24 CET 2002
On Thu, 14 Mar 2002, Kis Gergely wrote:
> Hello,
> I would like to ask, whether it would be possible to extend the surround
> plugin to generate 6 channel sound instead of 4 channel. I have an SBLive
> 5.1 with six speakers, and would like to use the center/subwoofer even if
> the audio stream is only stereo. I think it could be done this way:
>
> -mix the stereo sound together to get mono sound.
> -use a lowpass filter on the mono sound, and send it to the subwoofer.
> -use a highpass filter on the mono sound, and send it to the center.
> -the other 4 speakers would get the original stereo (or surround) data, as
> it works now.
>
> This is not an official feature request, I only would like to know if my
> idea is feasible.
Hi Kis,
Its surely feasible.
The references I read don't generally recommend to send a mono mix to the
centre speaker due to the fact that it narrows the sound stage.
Its quite CPU intensive to do a tight low-pass filter at subwoofer type
frequencies. The surround decoder uses a C based filter which probably
isn't fast enough to run a lot of taps - but there is MMX code also in
mplayer that may allow it.
I'll have a look at it.
Steve
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