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upmix.txt
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.