V4L2 Framework

[Kaushal Billore]

I have some doubt regarding Linux kernel V4l2 API's.
When
 capture application calls Reqbuff ioctl to allocate n no of buffer 
which would belongs to v4l2 layer and display application calls the 
Reqbuff ioctl to allocate N no of buffer which would also belongs to 
device memory.

Question:
1. V4l2 maintains the generic layer 
for all devices in which buffers can be allocated by any device and can 
be handle by any device?

2. If not then while capturing the data 
from capture device can capture device allocated buffer gets filled and 
while displaying the same data  there memory copy happens between 
capture buffer and output buffers?

3. If not then I want to capture data from capture device and display onto display device through the v4l2 framework layer. 
   
Awaiting for responce!

Thanks in advance 
Kaushal 
 		 	   		  
 		 	   		  
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