RE: Memory allocation in Video4Linux

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Curious for the below, why it is a sum? Will you use all of format at the same time? 

> 	1 RAW16: 2*14 = 28MB
> 	1 qplane6: 6/4 * 14 = 21MB
> 	1 yuv420_16: 2 * 1.5 * 14 = 42MB
> 	1 yuv420: 1.5 * 14 = 21MB
> 	1 yuv444: 3 * 14 = 42MB
> 	total: 154MB.

> -----Original Message-----
> From: umg-meego-handset-kernel-bounces@xxxxxxxxxxxxxxxxxxxxxxx
> [mailto:umg-meego-handset-kernel-bounces@xxxxxxxxxxxxxxxxxxxxxxx] On
> Behalf Of Wang, Wen W
> Sent: Wednesday, February 09, 2011 2:23 PM
> To: linux-media@xxxxxxxxxxxxxxx; umg-meego-handset-
> kernel@xxxxxxxxxxxxxxxxxxxxxxx
> Cc: Jozef Kruger
> Subject: [Umg-meego-handset-kernel] Memory allocation in Video4Linux
> 
> Hi,
> 
> We are developing the image processor driver for Intel Medfield platform.
> 
> We have received some comments on memory management that we should use
> standard Linux kernel interfaces for this, since we are doing everything
> by ourselves including memory allocation (based on pages), page table
> management, virtual address management and etc.
> 
> So can you please help give some advice or suggestion on using standard
> kernel interface for memory management?
> 
> The processor has a MMU on-chip with same virtual address range as IA. The
> processor will access system memory (read and write) through MMU and page
> table. The memory consumption of the driver could be quite big especially
> for high resolution (14MP) with certain features turned on.
> For example: advanced ISP with XNR and yuv444 output, at 14MP this uses:
> 	1 RAW16: 2*14 = 28MB
> 	1 qplane6: 6/4 * 14 = 21MB
> 	1 yuv420_16: 2 * 1.5 * 14 = 42MB
> 	1 yuv420: 1.5 * 14 = 21MB
> 	1 yuv444: 3 * 14 = 42MB
> 	total: 154MB.
> 
> Thanks
> Wen
> _______________________________________________
> Umg-meego-handset-kernel mailing list
> Umg-meego-handset-kernel@xxxxxxxxxxxxxxxxxxxxxxx
> http://umglistsvr.jf.intel.com/mailman/listinfo/umg-meego-handset-kernel
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