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