Re: How to express planar formats with mediabus format code?

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Jiaquan,

On Wednesday 21 August 2013 18:14:50 Su Jiaquan wrote:
> On Tue, Aug 20, 2013 at 8:53 PM, Laurent Pinchart wrote:
> > Hi Jiaquan,
> > 
> > I'm not sure if that's needed here. Vendor-specific formats still need to
> > be documented, so we could just create a custom YUV format for your case.
> > Let's start with the beginning, could you describe what gets transmitted
> > on the bus when that special format is selected ?
> 
> For YUV420P format, the data format sent from IPC is similar to
> V4L2_MBUS_FMT_YUYV8_1_5X8, but the content for each line is different:
> For odd line, it's YYU YYU YYU... For even line, it's YYV YYV YYV...
> then DMA engine send them to RAM in planar format.
> 
> For YUV420SP format, the data format sent from IPC is YYUV YYUV
> YYUV(maybe called V4L2_MBUS_FMT_YYUV8_2X8?), but DMA engine drop UV
> every other line, then send them to RAM as semi-planar.

V4L2_MBUS_FMT_YYUV8_2X8 looks good to me.

> Well, the first data format is too odd, I don't have a clue how to
> call it, do you have suggestion?

Maybe V4L2_MBUS_FMT_YU8_YV8_1_5X8 ? I've CC'ed Sakari Ailus, he's often pretty 
creative for these issues.

-- 
Regards,

Laurent Pinchart