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* Add upmix and vdownmix pluginsTakashi Iwai2006-03-211-0/+23
Added PCM upmix and vdownmix plugins. The upmix plugin is for upmixing to 4.0 or 5.1 surrounds by simple copying (and delay line for rear). The vdownmix plugin is a kind of "virtual surround", which downmixes 4.0 or 5.1 input to 2.0 output with some effect.