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doc: Clarify size properties wrt DMA-BUFs

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columbarius 2022-03-08 23:45:26 +01:00
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doc/dma-buf.dox
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@ -138,6 +138,15 @@ because of the following issues:
using a proper graphics API (such as EGL, Vulkan or VA-API) to process the
DMA-BUFs.
# Size of DMA-BUFs
When importing a DMA-BUF with a proper graphics API the size of a single buffer plane
is no relevant property since it will be derived by the driver from the other properties.
Therefore consumers should ignore the field `maxsize` of a `spa_data` and the field
`size` of a `spa_chunk` struct. Producers are allowed to set both to 0.
In cases where mapping a single plane is required the size should be obtained locally
via the filedescriptor.
# v4l2
Another use case for streaming via DMA-BUFs are exporting a camera feed from v4l2