On 2020-06-17 14:07, Huang Jiachai wrote:
> Hi Jonas Karlman,
>
> Is there an another yuv 10bit format with 4:4:4 sub-simpling but
> has no padding?
>
> Maybe we can call it DRM_FORMAT_NV30:
>
> { .format = DRM_FORMAT_NV30, .depth = 0,
> .num_planes = 2, .char_per_block = { 5, 5, 0 },
> .block_w = { 4, 2, 0 }, .block_h = { 1, 1, 0 }, .hsub = 1,
> .vsub = 1, .is_yuv = true },
>
> this format can supported by rockchip rk3288/rk3399... platform, can you
> add this format at this series patches?
I will send a v2 including this 4:4:4 format later this weekend.
Is there any hw block on rk3288/rk3399 that can produce a buffer in such format?
If I am not mistaken rkvdec only support 10-bit h264 in 4:2:0/4:2:2 and
hevc 4:2:0 10-bit, those are the formats I have been able to test so far.
Regards,
Jonas
>
> 在 2020/6/8 4:25, Jonas Karlman 写道:
>> DRM_FORMAT_NV20 is a 2 plane format suitable for linear memory layout.
>> The format is similar to P210 with 4:2:2 sub-sampling but has no padding
>> between components. Instead, luminance and chrominance samples are grouped
>> into 4s so that each group is packed into an integer number of bytes:
>>
>> YYYY = UVUV = 4 * 10 bits = 40 bits = 5 bytes
>>
>> The '20' suffix refers to the optimum effective bits per pixel which is
>> achieved when the total number of luminance samples is a multiple of 4.
>>
>> Signed-off-by: Jonas Karlman <jonas@xxxxxxxxx>
>> ---
>> drivers/gpu/drm/drm_fourcc.c | 4 ++++
>> include/uapi/drm/drm_fourcc.h | 1 +
>> 2 files changed, 5 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
>> index 722c7ebe4e88..2a9c8ae719ed 100644
>> --- a/drivers/gpu/drm/drm_fourcc.c
>> +++ b/drivers/gpu/drm/drm_fourcc.c
>> @@ -278,6 +278,10 @@ const struct drm_format_info *__drm_format_info(u32 format)
>> .num_planes = 2, .char_per_block = { 5, 5, 0 },
>> .block_w = { 4, 2, 0 }, .block_h = { 1, 1, 0 }, .hsub = 2,
>> .vsub = 2, .is_yuv = true },
>> + { .format = DRM_FORMAT_NV20, .depth = 0,
>> + .num_planes = 2, .char_per_block = { 5, 5, 0 },
>> + .block_w = { 4, 2, 0 }, .block_h = { 1, 1, 0 }, .hsub = 2,
>> + .vsub = 1, .is_yuv = true },
>> { .format = DRM_FORMAT_Q410, .depth = 0,
>> .num_planes = 3, .char_per_block = { 2, 2, 2 },
>> .block_w = { 1, 1, 1 }, .block_h = { 1, 1, 1 }, .hsub = 0,
>> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
>> index b5bf1c0e630e..244d32433a67 100644
>> --- a/include/uapi/drm/drm_fourcc.h
>> +++ b/include/uapi/drm/drm_fourcc.h
>> @@ -242,6 +242,7 @@ extern "C" {
>> * index 1 = Cr:Cb plane, [39:0] Cr1:Cb1:Cr0:Cb0 little endian
>> */
>> #define DRM_FORMAT_NV15 fourcc_code('N', 'V', '1', '5') /* 2x2 subsampled Cr:Cb plane */
>> +#define DRM_FORMAT_NV20 fourcc_code('N', 'V', '2', '0') /* 2x1 subsampled Cr:Cb plane */
>>
>> /*
>> * 2 plane YCbCr MSB aligned
>
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