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lavu/channel_layout: document the semantic of layouts.
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@ -36,6 +36,14 @@
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/**
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* @defgroup channel_masks Audio channel masks
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*
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* A channel layout is a 64-bits integer with a bit set for every channel.
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* The number of bits set must be equal to the number of channels.
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* The value 0 means that the channel layout is not known.
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* @note this data structure is not powerful enough to handle channels
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* combinations that have the same channel multiple times, such as
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* dual-mono.
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*
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* @{
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*/
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#define AV_CH_FRONT_LEFT 0x00000001
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