From bd08a0cd5f546916a9454ae2c35756ed77957458 Mon Sep 17 00:00:00 2001 From: Kamil Debski Date: Fri, 11 Mar 2011 06:16:22 -0300 Subject: [PATCH] [media] v4l: Documentation for the NV12MT format Added documentation for V4L2_PIX_FMT_NV12MT format. This is a YUV 4:2:0 format with macro block size of 64x32 and specific order of macro blocks in the memory. Signed-off-by: Kamil Debski Signed-off-by: Kyungmin Park Signed-off-by: Mauro Carvalho Chehab --- Documentation/DocBook/media-entities.tmpl | 1 + Documentation/DocBook/v4l/nv12mt.gif | Bin 0 -> 2108 bytes Documentation/DocBook/v4l/nv12mt_example.gif | Bin 0 -> 6858 bytes Documentation/DocBook/v4l/pixfmt-nv12mt.xml | 74 +++++++++++++++++++++++++++ Documentation/DocBook/v4l/pixfmt.xml | 1 + 5 files changed, 76 insertions(+) create mode 100644 Documentation/DocBook/v4l/nv12mt.gif create mode 100644 Documentation/DocBook/v4l/nv12mt_example.gif create mode 100644 Documentation/DocBook/v4l/pixfmt-nv12mt.xml diff --git a/Documentation/DocBook/media-entities.tmpl b/Documentation/DocBook/media-entities.tmpl index 40158ee..5d259c6 100644 --- a/Documentation/DocBook/media-entities.tmpl +++ b/Documentation/DocBook/media-entities.tmpl @@ -272,6 +272,7 @@ + diff --git a/Documentation/DocBook/v4l/nv12mt.gif b/Documentation/DocBook/v4l/nv12mt.gif new file mode 100644 index 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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 adjactent 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. +
+ <constant>V4L2_PIX_FMT_NV12MT</constant> 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. + + + Memory layout of macroblocks in <constant>V4L2_PIX_FMT_NV12 +</constant> format pixel image - extreme case + +
+ Example <constant>V4L2_PIX_FMT_NV12MT</constant> memory +layout of macroblocks + + + + + +
+ Memory layout of macroblocks of V4L2_PIX_FMT_NV12MT + format in most extreme case. + + + + + + diff --git a/Documentation/DocBook/v4l/pixfmt.xml b/Documentation/DocBook/v4l/pixfmt.xml index f8436dc..c6fdcbb 100644 --- a/Documentation/DocBook/v4l/pixfmt.xml +++ b/Documentation/DocBook/v4l/pixfmt.xml @@ -709,6 +709,7 @@ information. &sub-yuv411p; &sub-nv12; &sub-nv12m; + &sub-nv12mt; &sub-nv16; -- 2.7.4