linux-kernel - Re: [PATCH 1/2] drm_fourcc: Add new P010 video format

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Date:   Thu, 5 Jan 2017 00:31:27 +0800
From:   ayaka <ayaka@...lik.info>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:     dri-devel@...ts.freedesktop.org, randy.li@...k-chips.com,
        linux-kernel@...r.kernel.org, daniel.vetter@...el.com,
        mchehab@...nel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH 1/2] drm_fourcc: Add new P010 video format


On 01/04/2017 11:56 PM, Ville Syrjälä wrote:
> On Mon, Jan 02, 2017 at 04:50:03PM +0800, Randy Li wrote:
>> P010 is a planar 4:2:0 YUV with interleaved UV plane, 10 bits
>> per channel video format. Rockchip's vop support this
>> video format(little endian only) as the input video format.
>>
>> Signed-off-by: Randy Li <ayaka@...lik.info>
>> ---
>>   include/uapi/drm/drm_fourcc.h | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
>> index 9e1bb7f..d2721da 100644
>> --- a/include/uapi/drm/drm_fourcc.h
>> +++ b/include/uapi/drm/drm_fourcc.h
>> @@ -119,6 +119,7 @@ extern "C" {
>>   #define DRM_FORMAT_NV61		fourcc_code('N', 'V', '6', '1') /* 2x1 subsampled Cb:Cr plane */
>>   #define DRM_FORMAT_NV24		fourcc_code('N', 'V', '2', '4') /* non-subsampled Cr:Cb plane */
>>   #define DRM_FORMAT_NV42		fourcc_code('N', 'V', '4', '2') /* non-subsampled Cb:Cr plane */
>> +#define DRM_FORMAT_P010		fourcc_code('P', '0', '1', '0') /* 2x2 subsampled Cr:Cb plane 10 bits per channel */
> We could use a better description of the format here. IIRC there is
> 10bits of actual data contained in each 16bits. So there should be a
> proper comment explaning in which way the bits are stored.
It is a little hard to describe P010, which leaves a problem cpp 
information in the new patches.
Also I have no idea how to draw the byte-order table the rst document 
for v4l2.
>
>>   
>>   /*
>>    * 3 plane YCbCr
>> -- 
>> 2.7.4
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@...ts.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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