Software: Apache/2.4.41 (Ubuntu). PHP/8.0.30 

uname -a: Linux apirnd 5.4.0-204-generic #224-Ubuntu SMP Thu Dec 5 13:38:28 UTC 2024 x86_64 

uid=33(www-data) gid=33(www-data) groups=33(www-data) 

Safe-mode: OFF (not secure)

/usr/share/doc/libasound2-plugins/   drwxr-xr-x
Free 12.99 GB of 57.97 GB (22.4%)
                            Encoder    Tools    Proc.    FTP brute    Sec.    SQL    PHP-code    Update    Self remove    Logout    

Viewing file:     upmix.txt (1.21 KB)      -rw-r--r--

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.