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SubjectRe: [PATCH 01/36] drm/fourcc: Add 2 plane YCbCr 10bit format support
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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',


>
>> + */
>> +
>> +#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@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel


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