UPMIX PLUGIN
============
The upmix plugin is an easy-to-use plugin for upmixing to 4 or
6-channel stream. The number of channels to be expanded is determined
by the slave PCM or explicitly via channel option. For example, the
following PCM defines upmixing to 5.1 from 1-6 channels input:
pcm.upmix51 {
type upmix
slave.pcm "surround51"
}
You can use this PCM as a default one by defining below:
pcm.!default "plug:upmix51"
The upmix plugin copies left and right channels to rear left and right
with a certain delay. The delay size can be specified by "delay" PCM
option in msec. For example, to set 10ms delay in the above case:
pcm.upmix51 {
type upmix
slave.pcm "surround51"
delay 10
}
As default, 15ms delay is used.
The channel option specifies the number of channels of output. Either
4 or 6 channels are supported. When 0 is passed, the plugin tries 4
or 6 channels appropriately suitable for the slave pcm. The channel
option is useful if the slave PCM has no strict input condition (like
plug or route plugin).
pcm.myupmix {
type upmix
slave.pcm "something"
channels 6
}
The center and LFE channels are the average of sum of left and right
signals.
The accepted format is currently only S16.
Generated by dwww version 1.14 on Sat Apr 19 01:35:07 CEST 2025.