1*4882a593Smuzhiyun.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2*4882a593Smuzhiyun 3*4882a593Smuzhiyun.. _V4L2-PIX-FMT-YUV420M: 4*4882a593Smuzhiyun.. _v4l2-pix-fmt-yvu420m: 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun************************************************************ 7*4882a593SmuzhiyunV4L2_PIX_FMT_YUV420M ('YM12'), V4L2_PIX_FMT_YVU420M ('YM21') 8*4882a593Smuzhiyun************************************************************ 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun 11*4882a593SmuzhiyunV4L2_PIX_FMT_YVU420M 12*4882a593SmuzhiyunVariation of ``V4L2_PIX_FMT_YUV420`` and ``V4L2_PIX_FMT_YVU420`` with 13*4882a593Smuzhiyunplanes non contiguous in memory. 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun 16*4882a593SmuzhiyunDescription 17*4882a593Smuzhiyun=========== 18*4882a593Smuzhiyun 19*4882a593SmuzhiyunThis is a multi-planar format, as opposed to a packed format. The three 20*4882a593Smuzhiyuncomponents are separated into three sub-images or planes. 21*4882a593Smuzhiyun 22*4882a593SmuzhiyunThe Y plane is first. The Y plane has one byte per pixel. For 23*4882a593Smuzhiyun``V4L2_PIX_FMT_YUV420M`` the Cb data constitutes the second plane which 24*4882a593Smuzhiyunis half the width and half the height of the Y plane (and of the image). 25*4882a593SmuzhiyunEach Cb belongs to four pixels, a two-by-two square of the image. For 26*4882a593Smuzhiyunexample, Cb\ :sub:`0` belongs to Y'\ :sub:`00`, Y'\ :sub:`01`, 27*4882a593SmuzhiyunY'\ :sub:`10`, and Y'\ :sub:`11`. The Cr data, just like the Cb plane, 28*4882a593Smuzhiyunis in the third plane. 29*4882a593Smuzhiyun 30*4882a593Smuzhiyun``V4L2_PIX_FMT_YVU420M`` is the same except the Cr data is stored in the 31*4882a593Smuzhiyunsecond plane and the Cb data in the third plane. 32*4882a593Smuzhiyun 33*4882a593SmuzhiyunIf the Y plane has pad bytes after each row, then the Cb and Cr planes 34*4882a593Smuzhiyunhave half as many pad bytes after their rows. In other words, two Cx 35*4882a593Smuzhiyunrows (including padding) is exactly as long as one Y row (including 36*4882a593Smuzhiyunpadding). 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun``V4L2_PIX_FMT_YUV420M`` and ``V4L2_PIX_FMT_YVU420M`` are intended to be 39*4882a593Smuzhiyunused only in drivers and applications that support the multi-planar API, 40*4882a593Smuzhiyundescribed in :ref:`planar-apis`. 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun**Byte Order.** 43*4882a593SmuzhiyunEach cell is one byte. 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun 48*4882a593Smuzhiyun.. flat-table:: 49*4882a593Smuzhiyun :header-rows: 0 50*4882a593Smuzhiyun :stub-columns: 0 51*4882a593Smuzhiyun 52*4882a593Smuzhiyun * - start0 + 0: 53*4882a593Smuzhiyun - Y'\ :sub:`00` 54*4882a593Smuzhiyun - Y'\ :sub:`01` 55*4882a593Smuzhiyun - Y'\ :sub:`02` 56*4882a593Smuzhiyun - Y'\ :sub:`03` 57*4882a593Smuzhiyun * - start0 + 4: 58*4882a593Smuzhiyun - Y'\ :sub:`10` 59*4882a593Smuzhiyun - Y'\ :sub:`11` 60*4882a593Smuzhiyun - Y'\ :sub:`12` 61*4882a593Smuzhiyun - Y'\ :sub:`13` 62*4882a593Smuzhiyun * - start0 + 8: 63*4882a593Smuzhiyun - Y'\ :sub:`20` 64*4882a593Smuzhiyun - Y'\ :sub:`21` 65*4882a593Smuzhiyun - Y'\ :sub:`22` 66*4882a593Smuzhiyun - Y'\ :sub:`23` 67*4882a593Smuzhiyun * - start0 + 12: 68*4882a593Smuzhiyun - Y'\ :sub:`30` 69*4882a593Smuzhiyun - Y'\ :sub:`31` 70*4882a593Smuzhiyun - Y'\ :sub:`32` 71*4882a593Smuzhiyun - Y'\ :sub:`33` 72*4882a593Smuzhiyun * - 73*4882a593Smuzhiyun * - start1 + 0: 74*4882a593Smuzhiyun - Cb\ :sub:`00` 75*4882a593Smuzhiyun - Cb\ :sub:`01` 76*4882a593Smuzhiyun * - start1 + 2: 77*4882a593Smuzhiyun - Cb\ :sub:`10` 78*4882a593Smuzhiyun - Cb\ :sub:`11` 79*4882a593Smuzhiyun * - 80*4882a593Smuzhiyun * - start2 + 0: 81*4882a593Smuzhiyun - Cr\ :sub:`00` 82*4882a593Smuzhiyun - Cr\ :sub:`01` 83*4882a593Smuzhiyun * - start2 + 2: 84*4882a593Smuzhiyun - Cr\ :sub:`10` 85*4882a593Smuzhiyun - Cr\ :sub:`11` 86*4882a593Smuzhiyun 87*4882a593Smuzhiyun 88*4882a593Smuzhiyun**Color Sample Location:** 89*4882a593Smuzhiyun 90*4882a593Smuzhiyun 91*4882a593Smuzhiyun 92*4882a593Smuzhiyun.. flat-table:: 93*4882a593Smuzhiyun :header-rows: 0 94*4882a593Smuzhiyun :stub-columns: 0 95*4882a593Smuzhiyun 96*4882a593Smuzhiyun * - 97*4882a593Smuzhiyun - 0 98*4882a593Smuzhiyun - 99*4882a593Smuzhiyun - 1 100*4882a593Smuzhiyun - 101*4882a593Smuzhiyun - 2 102*4882a593Smuzhiyun - 103*4882a593Smuzhiyun - 3 104*4882a593Smuzhiyun * - 0 105*4882a593Smuzhiyun - Y 106*4882a593Smuzhiyun - 107*4882a593Smuzhiyun - Y 108*4882a593Smuzhiyun - 109*4882a593Smuzhiyun - Y 110*4882a593Smuzhiyun - 111*4882a593Smuzhiyun - Y 112*4882a593Smuzhiyun * - 113*4882a593Smuzhiyun - 114*4882a593Smuzhiyun - C 115*4882a593Smuzhiyun - 116*4882a593Smuzhiyun - 117*4882a593Smuzhiyun - 118*4882a593Smuzhiyun - C 119*4882a593Smuzhiyun - 120*4882a593Smuzhiyun * - 1 121*4882a593Smuzhiyun - Y 122*4882a593Smuzhiyun - 123*4882a593Smuzhiyun - Y 124*4882a593Smuzhiyun - 125*4882a593Smuzhiyun - Y 126*4882a593Smuzhiyun - 127*4882a593Smuzhiyun - Y 128*4882a593Smuzhiyun * - 129*4882a593Smuzhiyun * - 2 130*4882a593Smuzhiyun - Y 131*4882a593Smuzhiyun - 132*4882a593Smuzhiyun - Y 133*4882a593Smuzhiyun - 134*4882a593Smuzhiyun - Y 135*4882a593Smuzhiyun - 136*4882a593Smuzhiyun - Y 137*4882a593Smuzhiyun * - 138*4882a593Smuzhiyun - 139*4882a593Smuzhiyun - C 140*4882a593Smuzhiyun - 141*4882a593Smuzhiyun - 142*4882a593Smuzhiyun - 143*4882a593Smuzhiyun - C 144*4882a593Smuzhiyun - 145*4882a593Smuzhiyun * - 3 146*4882a593Smuzhiyun - Y 147*4882a593Smuzhiyun - 148*4882a593Smuzhiyun - Y 149*4882a593Smuzhiyun - 150*4882a593Smuzhiyun - Y 151*4882a593Smuzhiyun - 152*4882a593Smuzhiyun - Y 153