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Diffstat (limited to 'doc/upmix.txt')
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diff --git a/doc/upmix.txt b/doc/upmix.txt new file mode 100644 index 0000000..b8a6da4 --- /dev/null +++ b/doc/upmix.txt @@ -0,0 +1,34 @@ +UPMIX PLUGIN +============ + +The upmix plugin is an easy-to-use plugin for upmixing from 1 or 2 +channel stream to 4 or 6-channel stream. The number of channels to be +expanded is determined by the slave PCM. For example, the following +PCM defines upmixing to 5.1 from 2-6 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" + channels 6 + delay 10 + } + +As default, 15ms delay is used. + +The center and LFE channels are the average of sum of left and right +signals. + +The accepted format is currently only S16. |