RE: mediabus enums

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On Fri, 12 Nov 2010, Hadli, Manjunath wrote:

> On Thu, Nov 11, 2010 at 22:17:23, Laurent Pinchart wrote:
> > Hi Guennadi,
> > 
> > On Thursday 11 November 2010 16:32:02 Guennadi Liakhovetski wrote:
> > > On Wed, 10 Nov 2010, Hadli, Manjunath wrote:
> > > > Hello Guennadi,
> > > > 
> > > >    Your media-bus enumerations capture the formats quite well. I 
> > > > needed
> > > > 
> > > > the following for support on Davinci SOCs and liked to check with 
> > > > you if these are covered in some format in the list.
> > > > 1. Parallel RGB 666 (18 data lines+ 5 sync lines) 2. YUYV16 (16 
> > > > lines) (16 data lines + 4 or 5 sync lines)
> > > 
> > > According to the subdev-formats.xml
> > > 
> > > http://git.linuxtv.org/pinchartl/media.git?a=blob;f=Documentation/DocB
> > > ook/v 
> > > 4l/subdev-formats.xml;h=3688f27185f72ab109e3094c268e04f67cb8643e;hb=re
> > > fs/he
> > > ads/media-0003-subdev-pad
> > > 
> > > they should be called V4L2_MBUS_FMT_RGB666_1X18 (or BGR666...)
> > 
> > Agreed.
> > 
> > > and V4L2_MBUS_FMT_YUYV16_1X16.
> > 
> > Depending on what Manjunath meant, this should be either YUYV16_2X16 or 
> > YUYV8_1X16. 16 bits per sample seems quite high to me, I suppose it should 
> > then be YUYV8_1X16.
> 
> Actually, the interface transfers 16 bits per sample (Y=8bits and C=8bits)
> For the YC16 and 18 data lines (parallel) for RGB666. probably 
> V4L2_MBUS_FMT_RGB666_1X18 and V4L2_MBUS_FMT_YUYV16_1X16 fit the bill.

No, I think, Laurent was right. If that your 1 16-bit sample also 
corresponds to one pixel, then it's a normal 16-bit YUYV, i.e., 
V4L2_MBUS_FMT_YUYV8_1X16. In the aforementioned document the number after 
"YUYV" is "The number of bits per pixel component," where the "component" 
is either the luminance, or the chrominance, both of which are 8 bit wide.

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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