diff options
Diffstat (limited to 'Documentation/media/uapi/v4l/pixfmt-nv12mt.rst')
| -rw-r--r-- | Documentation/media/uapi/v4l/pixfmt-nv12mt.rst | 67 |
1 files changed, 0 insertions, 67 deletions
diff --git a/Documentation/media/uapi/v4l/pixfmt-nv12mt.rst b/Documentation/media/uapi/v4l/pixfmt-nv12mt.rst deleted file mode 100644 index 2092725de33c..000000000000 --- a/Documentation/media/uapi/v4l/pixfmt-nv12mt.rst +++ /dev/null @@ -1,67 +0,0 @@ -.. Permission is granted to copy, distribute and/or modify this -.. document under the terms of the GNU Free Documentation License, -.. Version 1.1 or any later version published by the Free Software -.. Foundation, with no Invariant Sections, no Front-Cover Texts -.. and no Back-Cover Texts. A copy of the license is included at -.. Documentation/media/uapi/fdl-appendix.rst. -.. -.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections - -.. _V4L2-PIX-FMT-NV12MT: - -**************************** -V4L2_PIX_FMT_NV12MT ('TM12') -**************************** - -Formats with ½ horizontal and vertical chroma resolution. This format -has two planes - one for luminance and one for chrominance. Chroma -samples are interleaved. The difference to ``V4L2_PIX_FMT_NV12`` is the -memory layout. Pixels are grouped in macroblocks of 64x32 size. The -order of macroblocks in memory is also not standard. - - -Description -=========== - -This is the two-plane versions of the YUV 4:2:0 format where data is -grouped into 64x32 macroblocks. The three components are separated into -two sub-images or planes. The Y plane has one byte per pixel and pixels -are grouped into 64x32 macroblocks. The CbCr plane has the same width, -in bytes, as the Y plane (and the image), but is half as tall in pixels. -The chroma plane is also grouped into 64x32 macroblocks. - -Width of the buffer has to be aligned to the multiple of 128, and height -alignment is 32. Every four adjacent buffers - two horizontally and two -vertically are grouped together and are located in memory in Z or -flipped Z order. - -Layout of macroblocks in memory is presented in the following figure. - - -.. _nv12mt: - -.. kernel-figure:: nv12mt.svg - :alt: nv12mt.svg - :align: center - - V4L2_PIX_FMT_NV12MT macroblock Z shape memory layout - -The requirement that width is multiple of 128 is implemented because, -the Z shape cannot be cut in half horizontally. In case the vertical -resolution of macroblocks is odd then the last row of macroblocks is -arranged in a linear order. - -In case of chroma the layout is identical. Cb and Cr samples are -interleaved. Height of the buffer is aligned to 32. - - -.. _nv12mt_ex: - -.. kernel-figure:: nv12mt_example.svg - :alt: nv12mt_example.svg - :align: center - - Example V4L2_PIX_FMT_NV12MT memory layout of macroblocks - -Memory layout of macroblocks of ``V4L2_PIX_FMT_NV12MT`` format in most -extreme case. |