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VDOWNMIX PLUGIN
===============

The vdownmix plugin is a downmixer from 4-6 channels to 2-channel
stereo headphone output.  This plugin processes the input signals with
a simple spacialization, so the output sounds like a kind of "virtual
surround".

For example, define the below:

        pcm.!surround51 {
                type vdownmix
                slave.pcm "default"
        }
        pcm.!surround40 {
                type vdownmix
                slave.pcm "default"
        }

and the outputs from video player to these PCMs are converted to the
default 2.0 output with a proper downmix.

The accepted format is currently only S16.

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