On Mon, Sep 23, 2019 at 06:05:22AM -0700, sandy.huang wrote:
>
> 在 2019/9/23 上午5:53, Ville Syrjälä 写道:
> > On Mon, Sep 23, 2019 at 08:38:50PM +0800, Sandy Huang wrote:
> >> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> >> index 3feeaa3..5fe89e9 100644
> >> --- a/include/uapi/drm/drm_fourcc.h
> >> +++ b/include/uapi/drm/drm_fourcc.h
> >> @@ -266,6 +266,21 @@ extern "C" {
> >> #define DRM_FORMAT_P016 fourcc_code('P', '0', '1', '6') /* 2x2 subsampled Cr:Cb plane 16 bits per channel */
> >>
> >> /*
> >> + * 2 plane YCbCr 10bit
> >> + * index 0 = Y plane, [9:0] Y
> >> + * index 1 = Cr:Cb plane, [19:0] Cr:Cb little endian
> >> + * or
> >> + * index 1 = Cb:Cr plane, [19:0] Cb:Cr little endian
> > What does "little endian" even mean for these?
>
> It's Inherited from the following define, the difference is 8bit and 10bit.
> /*
> * 2 plane YCbCr
> * index 0 = Y plane, [7:0] Y
> * index 1 = Cr:Cb plane, [15:0] Cr:Cb little endian
> * or
> * index 1 = Cb:Cr plane, [15:0] Cb:Cr little endian
> */
> #define DRM_FORMAT_NV12 fourcc_code('N', 'V', '1', '2') /* 2x2
> subsampled Cr:Cb plane */
> #define DRM_FORMAT_NV21 fourcc_code('N', 'V', '2', '1') /* 2x2
> subsampled Cb:Cr plane */
> #define DRM_FORMAT_NV16 fourcc_code('N', 'V', '1', '6') /* 2x1
> subsampled Cr:Cb plane */
> #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',
Something not aligned to bytes can't have its endianness defined the
same way as these. Just doesn't make sense.
>
>
>
> >
> >> + */
> >> +
> >> +#define DRM_FORMAT_NV12_10 fourcc_code('N', 'A', '1', '2') /* 2x2 subsampled Cr:Cb plane */
> >> +#define DRM_FORMAT_NV21_10 fourcc_code('N', 'A', '2', '1') /* 2x2 subsampled Cb:Cr plane */
> >> +#define DRM_FORMAT_NV16_10 fourcc_code('N', 'A', '1', '6') /* 2x1 subsampled Cr:Cb plane */
> >> +#define DRM_FORMAT_NV61_10 fourcc_code('N', 'A', '6', '1') /* 2x1 subsampled Cb:Cr plane */
> >> +#define DRM_FORMAT_NV24_10 fourcc_code('N', 'A', '2', '4') /* non-subsampled Cr:Cb plane */
> >> +#define DRM_FORMAT_NV42_10 fourcc_code('N', 'A', '4', '2') /* non-subsampled Cb:Cr plane */
> >> +
> >> +/*
> >> * 3 plane YCbCr
> >> * index 0: Y plane, [7:0] Y
> >> * index 1: Cb plane, [7:0] Cb
> >> --
> >> 2.7.4
> >>
> >>
> >>
> >> _______________________________________________
> >> dri-devel mailing list
> >> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> >> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
--
Ville Syrjälä
Intel
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel
