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

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Message-ID: <20170104164649.GL31595@intel.com>
Date:   Wed, 4 Jan 2017 18:46:49 +0200
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     ayaka <ayaka@...lik.info>
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 Thu, Jan 05, 2017 at 12:31:27AM +0800, ayaka wrote:
>
>
> 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,

/*
 * 2 plane YCbCr
 * index 0 = Y plane, [15:0] Y:X 10:6 little-endian
 * index 1 = Cr:Cb plane, [31:0] Cr:X:Cb:X 10:6:10:6 little-endian
 */

/*
 * 2 plane YCbCr
 * index 0 = Y plane, [15:0] Y 16 little-endian
 * index 1 = Cr:Cb plane, [31:0] Cr:Cb 16:16 little-endian
 */

or something like that (not 100% sure I got the order of bits and
whatnot correct).

-- 
Ville Syrjälä
Intel OTC