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Diffstat (limited to 'Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst | 50 |
1 files changed, 35 insertions, 15 deletions
diff --git a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst index 090c091affd2..3a09d93d405b 100644 --- a/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst +++ b/Documentation/userspace-api/media/v4l/pixfmt-yuv-planar.rst @@ -99,7 +99,7 @@ All components are stored with the same number of bits per component. - 4:2:0 - Cb, Cr - No - - 64x32 macroblocks + - 64x32 tiles Horizontal Z order * - V4L2_PIX_FMT_NV12MT_16X16 @@ -108,7 +108,7 @@ All components are stored with the same number of bits per component. - 4:2:2 - Cb, Cr - No - - 16x16 macroblocks + - 16x16 tiles * - V4L2_PIX_FMT_NV16 - 'NV16' - 8 @@ -254,27 +254,47 @@ of the luma plane. .. _V4L2-PIX-FMT-NV12MT: .. _V4L2-PIX-FMT-NV12MT-16X16: +.. _V4L2-PIX-FMT-NV12-4L4: +.. _V4L2-PIX-FMT-NV12-16L16: +.. _V4L2-PIX-FMT-NV12-32L32: -NV12MT and MV12MT_16X16 ------------------------ +Tiled NV12 +---------- Semi-planar YUV 4:2:0 formats, using macroblock tiling. The chroma plane is subsampled by 2 in each direction. Chroma lines contain half the number of pixels and the same number of bytes as luma lines, and the chroma plane -contains half the number of lines of the luma plane. +contains half the number of lines of the luma plane. Each tile follows the +previous one linearly in memory (from left to right, top to bottom). + +``V4L2_PIX_FMT_NV12MT_16X16`` is similar to ``V4L2_PIX_FMT_NV12M`` but stores +pixels in 2D 16x16 tiles, and stores tiles linearly in memory. +The line stride and image height must be aligned to a multiple of 16. +The layouts of the luma and chroma planes are identical. + +``V4L2_PIX_FMT_NV12MT`` is similar to ``V4L2_PIX_FMT_NV12M`` but stores +pixels in 2D 64x32 tiles, and stores 2x2 groups of tiles in +Z-order in memory, alternating Z and mirrored Z shapes horizontally. +The line stride must be a multiple of 128 pixels to ensure an +integer number of Z shapes. The image height must be a multiple of 32 pixels. +If the vertical resolution is an odd number of tiles, the last row of +tiles is stored in linear order. The layouts of the luma and chroma +planes are identical. + +``V4L2_PIX_FMT_NV12_4L4`` stores pixel in 4x4 tiles, and stores +tiles linearly in memory. The line stride and image height must be +aligned to a multiple of 4. The layouts of the luma and chroma planes are +identical. -``V4L2_PIX_FMT_NV12MT_16X16`` stores pixel in 2D 16x16 macroblocks, and stores -macroblocks linearly in memory. The line stride and image height must be +``V4L2_PIX_FMT_NV12_16L16`` stores pixel in 16x16 tiles, and stores +tiles linearly in memory. The line stride and image height must be aligned to a multiple of 16. The layouts of the luma and chroma planes are identical. -``V4L2_PIX_FMT_NV12MT`` stores pixels in 2D 64x32 macroblocks, and stores 2x2 -groups of macroblocks in Z-order in memory, alternating Z and mirrored Z shapes -horizontally. The line stride must be a multiple of 128 pixels to ensure an -integer number of Z shapes. The image height must be a multiple of 32 pixels. -If the vertical resolution is an odd number of macroblocks, the last row of -macroblocks is stored in linear order. The layouts of the luma and chroma -planes are identical. +``V4L2_PIX_FMT_NV12_32L32`` stores pixel in 32x32 tiles, and stores +tiles linearly in memory. The line stride and image height must be +aligned to a multiple of 32. The layouts of the luma and chroma planes are +identical. .. _nv12mt: @@ -290,7 +310,7 @@ planes are identical. :alt: nv12mt_example.svg :align: center - Example V4L2_PIX_FMT_NV12MT memory layout of macroblocks + Example V4L2_PIX_FMT_NV12MT memory layout of tiles .. _V4L2-PIX-FMT-NV16: |