questions about v4l2 spec #2

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Hi,

after reading the v4l2 specs there are some questions remaining.

mmap - map driver buffers to user space

After requesting buffer should I only mmap a single buffer per mmap() - 
call ? 

Or is it possible to map multiple buffers with one mmap ()- call ?

What if mmap () is called again for the same buffer ? 

TIA,

Franz





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