1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>Chapter 2. Image Formats</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="LINUX MEDIA INFRASTRUCTURE API"><link rel="up" href="v4l2spec.html" title="Part I. Video for Linux Two API Specification"><link rel="prev" href="streaming-par.html" title="Streaming Parameters"><link rel="next" href="ch02s02.html" title="Multi-planar format structures"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 2. Image Formats</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="streaming-par.html">Prev</a> </td><th width="60%" align="center">Part I. Video for Linux Two API Specification</th><td width="20%" align="right"> <a accesskey="n" href="ch02s02.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a name="pixfmt"></a>Chapter 2. Image Formats</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="section"><a href="pixfmt.html#idp1100345860">Single-planar format structure</a></span></dt><dt><span class="section"><a href="ch02s02.html">Multi-planar format structures</a></span></dt><dt><span class="section"><a href="ch02s03.html">Standard Image Formats</a></span></dt><dt><span class="section"><a href="colorspaces.html">Colorspaces</a></span></dt><dt><span class="section"><a href="ch02s05.html">Defining Colorspaces in V4L2</a></span></dt><dt><span class="section"><a href="ch02s06.html">Detailed Colorspace Descriptions</a></span></dt><dd><dl><dt><span class="section"><a href="ch02s06.html#col-smpte-170m">Colorspace SMPTE 170M (<code class="constant">V4L2_COLORSPACE_SMPTE170M</code>)</a></span></dt><dt><span class="section"><a href="ch02s06.html#col-rec709">Colorspace Rec. 709 (<code class="constant">V4L2_COLORSPACE_REC709</code>)</a></span></dt><dt><span class="section"><a href="ch02s06.html#col-srgb">Colorspace sRGB (<code class="constant">V4L2_COLORSPACE_SRGB</code>)</a></span></dt><dt><span class="section"><a href="ch02s06.html#col-adobergb">Colorspace Adobe RGB (<code class="constant">V4L2_COLORSPACE_ADOBERGB</code>)</a></span></dt><dt><span class="section"><a href="ch02s06.html#col-bt2020">Colorspace BT.2020 (<code class="constant">V4L2_COLORSPACE_BT2020</code>)</a></span></dt><dt><span class="section"><a href="ch02s06.html#col-smpte-240m">Colorspace SMPTE 240M (<code class="constant">V4L2_COLORSPACE_SMPTE240M</code>)</a></span></dt><dt><span class="section"><a href="ch02s06.html#col-sysm">Colorspace NTSC 1953 (<code class="constant">V4L2_COLORSPACE_470_SYSTEM_M</code>)</a></span></dt><dt><span class="section"><a href="ch02s06.html#col-sysbg">Colorspace EBU Tech. 3213 (<code class="constant">V4L2_COLORSPACE_470_SYSTEM_BG</code>)</a></span></dt><dt><span class="section"><a href="ch02s06.html#col-jpeg">Colorspace JPEG (<code class="constant">V4L2_COLORSPACE_JPEG</code>)</a></span></dt></dl></dd><dt><span class="section"><a href="pixfmt-indexed.html">Indexed Format</a></span></dt><dt><span class="section"><a href="pixfmt-rgb.html">RGB Formats</a></span></dt><dd><dl><dt><span class="refentrytitle"><a href="packed-rgb.html">Packed RGB formats</a></span><span class="refpurpose"> — Packed RGB formats</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-SBGGR8.html">V4L2_PIX_FMT_SBGGR8 ('BA81')</a></span><span class="refpurpose"> — Bayer RGB format</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-SGBRG8.html">V4L2_PIX_FMT_SGBRG8 ('GBRG')</a></span><span class="refpurpose"> — Bayer RGB format</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-SGRBG8.html">V4L2_PIX_FMT_SGRBG8 ('GRBG')</a></span><span class="refpurpose"> — Bayer RGB format</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-SRGGB8.html">V4L2_PIX_FMT_SRGGB8 ('RGGB')</a></span><span class="refpurpose"> — Bayer RGB format</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-SBGGR16.html">V4L2_PIX_FMT_SBGGR16 ('BYR2')</a></span><span class="refpurpose"> — Bayer RGB format</span></dt><dt><span class="refentrytitle"><a href="pixfmt-srggb10.html">V4L2_PIX_FMT_SRGGB10 ('RG10'), 2 V4L2_PIX_FMT_SGRBG10 ('BA10'), 3 V4L2_PIX_FMT_SGBRG10 ('GB10'), 4 V4L2_PIX_FMT_SBGGR10 ('BG10'), 5 </a></span><span class="refpurpose"> — 10-bit Bayer formats expanded to 16 bits</span></dt><dt><span class="refentrytitle"><a href="pixfmt-srggb10p.html">V4L2_PIX_FMT_SRGGB10P ('pRAA'), 6 V4L2_PIX_FMT_SGRBG10P ('pgAA'), 7 V4L2_PIX_FMT_SGBRG10P ('pGAA'), 8 V4L2_PIX_FMT_SBGGR10P ('pBAA'), 9 </a></span><span class="refpurpose"> — 10-bit packed Bayer formats</span></dt><dt><span class="refentrytitle"><a href="re09.html"> 10 V4L2_PIX_FMT_SBGGR10ALAW8 ('aBA8'), 11 V4L2_PIX_FMT_SGBRG10ALAW8 ('aGA8'), 12 V4L2_PIX_FMT_SGRBG10ALAW8 ('agA8'), 13 V4L2_PIX_FMT_SRGGB10ALAW8 ('aRA8'), 14 </a></span><span class="refpurpose"> — 10-bit Bayer formats compressed to 8 bits</span></dt><dt><span class="refentrytitle"><a href="pixfmt-srggb10dpcm8.html"> 15 V4L2_PIX_FMT_SBGGR10DPCM8 ('bBA8'), 16 V4L2_PIX_FMT_SGBRG10DPCM8 ('bGA8'), 17 V4L2_PIX_FMT_SGRBG10DPCM8 ('BD10'), 18 V4L2_PIX_FMT_SRGGB10DPCM8 ('bRA8'), 19 </a></span><span class="refpurpose"> — 10-bit Bayer formats compressed to 8 bits</span></dt><dt><span class="refentrytitle"><a href="re11.html">V4L2_PIX_FMT_SRGGB12 ('RG12'), 20 V4L2_PIX_FMT_SGRBG12 ('BA12'), 21 V4L2_PIX_FMT_SGBRG12 ('GB12'), 22 V4L2_PIX_FMT_SBGGR12 ('BG12'), 23 </a></span><span class="refpurpose"> — 12-bit Bayer formats expanded to 16 bits</span></dt></dl></dd><dt><span class="section"><a href="yuv-formats.html">YUV Formats</a></span></dt><dd><dl><dt><span class="refentrytitle"><a href="packed-yuv.html">Packed YUV formats</a></span><span class="refpurpose"> — Packed YUV formats</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-GREY.html">V4L2_PIX_FMT_GREY ('GREY')</a></span><span class="refpurpose"> — Grey-scale image</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-Y10.html">V4L2_PIX_FMT_Y10 ('Y10 ')</a></span><span class="refpurpose"> — Grey-scale image</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-Y12.html">V4L2_PIX_FMT_Y12 ('Y12 ')</a></span><span class="refpurpose"> — Grey-scale image</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-Y10BPACK.html">V4L2_PIX_FMT_Y10BPACK ('Y10B')</a></span><span class="refpurpose"> — Grey-scale image as a bit-packed array</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-Y16.html">V4L2_PIX_FMT_Y16 ('Y16 ')</a></span><span class="refpurpose"> — Grey-scale image</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-UV8.html">V4L2_PIX_FMT_UV8 ('UV8')</a></span><span class="refpurpose"> — UV plane interleaved</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-YUYV.html">V4L2_PIX_FMT_YUYV ('YUYV')</a></span><span class="refpurpose"> — Packed format with ½ horizontal chroma 24resolution, also known as YUV 4:2:2</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-UYVY.html">V4L2_PIX_FMT_UYVY ('UYVY')</a></span><span class="refpurpose"> — Variation of 25<code class="constant">V4L2_PIX_FMT_YUYV</code> with different order of samples 26in memory</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-YVYU.html">V4L2_PIX_FMT_YVYU ('YVYU')</a></span><span class="refpurpose"> — Variation of 27<code class="constant">V4L2_PIX_FMT_YUYV</code> with different order of samples 28in memory</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-VYUY.html">V4L2_PIX_FMT_VYUY ('VYUY')</a></span><span class="refpurpose"> — Variation of 29<code class="constant">V4L2_PIX_FMT_YUYV</code> with different order of samples 30in memory</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-Y41P.html">V4L2_PIX_FMT_Y41P ('Y41P')</a></span><span class="refpurpose"> — Format with ¼ horizontal chroma 31resolution, also known as YUV 4:1:1</span></dt><dt><span class="refentrytitle"><a href="re24.html">V4L2_PIX_FMT_YVU420 ('YV12'), V4L2_PIX_FMT_YUV420 ('YU12')</a></span><span class="refpurpose"> — Planar formats with ½ horizontal and 32vertical chroma resolution, also known as YUV 4:2:0</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-YUV420M.html">V4L2_PIX_FMT_YUV420M ('YM12')</a></span><span class="refpurpose"> — Variation of <code class="constant">V4L2_PIX_FMT_YUV420</code> 33 with planes non contiguous in memory. </span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-YVU420M.html">V4L2_PIX_FMT_YVU420M ('YM21')</a></span><span class="refpurpose"> — Variation of <code class="constant">V4L2_PIX_FMT_YVU420</code> 34 with planes non contiguous in memory. </span></dt><dt><span class="refentrytitle"><a href="re27.html">V4L2_PIX_FMT_YVU410 ('YVU9'), V4L2_PIX_FMT_YUV410 ('YUV9')</a></span><span class="refpurpose"> — Planar formats with ¼ horizontal and 35vertical chroma resolution, also known as YUV 4:1:0</span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-YUV422P.html">V4L2_PIX_FMT_YUV422P ('422P')</a></span><span class="refpurpose"> — Format with ½ horizontal chroma resolution, 36also known as YUV 4:2:2. Planar layout as opposed to 37<code class="constant">V4L2_PIX_FMT_YUYV</code></span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-YUV411P.html">V4L2_PIX_FMT_YUV411P ('411P')</a></span><span class="refpurpose"> — Format with ¼ horizontal chroma resolution, 38also known as YUV 4:1:1. Planar layout as opposed to 39<code class="constant">V4L2_PIX_FMT_Y41P</code></span></dt><dt><span class="refentrytitle"><a href="re30.html">V4L2_PIX_FMT_NV12 ('NV12'), V4L2_PIX_FMT_NV21 ('NV21')</a></span><span class="refpurpose"> — Formats with ½ horizontal and vertical 40chroma resolution, also known as YUV 4:2:0. One luminance and one 41chrominance plane with alternating chroma samples as opposed to 42<code class="constant">V4L2_PIX_FMT_YVU420</code></span></dt><dt><span class="refentrytitle"><a href="re31.html">V4L2_PIX_FMT_NV12M ('NM12'), V4L2_PIX_FMT_NV21M ('NM21'), V4L2_PIX_FMT_NV12MT_16X16</a></span><span class="refpurpose"> — Variation of <code class="constant">V4L2_PIX_FMT_NV12</code> and <code class="constant">V4L2_PIX_FMT_NV21</code> with planes 43 non contiguous in memory. </span></dt><dt><span class="refentrytitle"><a href="re32.html">V4L2_PIX_FMT_NV12MT ('TM12')</a></span><span class="refpurpose"> — Formats with ½ horizontal and vertical 44chroma resolution. This format has two planes - one for luminance and one for 45chrominance. Chroma samples are interleaved. The difference to 46<code class="constant">V4L2_PIX_FMT_NV12</code> is the memory layout. Pixels are 47grouped in macroblocks of 64x32 size. The order of macroblocks in memory is 48also not standard. 49 </span></dt><dt><span class="refentrytitle"><a href="re33.html">V4L2_PIX_FMT_NV16 ('NV16'), V4L2_PIX_FMT_NV61 ('NV61')</a></span><span class="refpurpose"> — Formats with ½ horizontal 50chroma resolution, also known as YUV 4:2:2. One luminance and one 51chrominance plane with alternating chroma samples as opposed to 52<code class="constant">V4L2_PIX_FMT_YVU420</code></span></dt><dt><span class="refentrytitle"><a href="re34.html">V4L2_PIX_FMT_NV16M ('NM16'), V4L2_PIX_FMT_NV61M ('NM61')</a></span><span class="refpurpose"> — Variation of <code class="constant">V4L2_PIX_FMT_NV16</code> and <code class="constant">V4L2_PIX_FMT_NV61</code> with planes 53 non contiguous in memory. </span></dt><dt><span class="refentrytitle"><a href="re35.html">V4L2_PIX_FMT_NV24 ('NV24'), V4L2_PIX_FMT_NV42 ('NV42')</a></span><span class="refpurpose"> — Formats with full horizontal and vertical 54chroma resolutions, also known as YUV 4:4:4. One luminance and one 55chrominance plane with alternating chroma samples as opposed to 56<code class="constant">V4L2_PIX_FMT_YVU420</code></span></dt><dt><span class="refentrytitle"><a href="V4L2-PIX-FMT-M420.html">V4L2_PIX_FMT_M420 ('M420')</a></span><span class="refpurpose"> — Format with ½ horizontal and vertical chroma 57 resolution, also known as YUV 4:2:0. Hybrid plane line-interleaved 58 layout.</span></dt></dl></dd><dt><span class="section"><a href="ch02s10.html">Compressed Formats</a></span></dt><dt><span class="section"><a href="sdr-formats.html">SDR Formats</a></span></dt><dd><dl><dt><span class="refentrytitle"><a href="V4L2-SDR-FMT-CU08.html">V4L2_SDR_FMT_CU8 ('CU08')</a></span><span class="refpurpose"> — Complex unsigned 8-bit IQ sample</span></dt><dt><span class="refentrytitle"><a href="V4L2-SDR-FMT-CU16LE.html">V4L2_SDR_FMT_CU16LE ('CU16')</a></span><span class="refpurpose"> — Complex unsigned 16-bit little endian IQ sample</span></dt><dt><span class="refentrytitle"><a href="V4L2-SDR-FMT-CS08.html">V4L2_SDR_FMT_CS8 ('CS08')</a></span><span class="refpurpose"> — Complex signed 8-bit IQ sample</span></dt><dt><span class="refentrytitle"><a href="V4L2-SDR-FMT-CS14LE.html">V4L2_SDR_FMT_CS14LE ('CS14')</a></span><span class="refpurpose"> — Complex signed 14-bit little endian IQ sample</span></dt><dt><span class="refentrytitle"><a href="V4L2-SDR-FMT-RU12LE.html">V4L2_SDR_FMT_RU12LE ('RU12')</a></span><span class="refpurpose"> — Real unsigned 12-bit little endian sample</span></dt></dl></dd><dt><span class="section"><a href="pixfmt-reserved.html">Reserved Format Identifiers</a></span></dt></dl></div><p>The V4L2 API was primarily designed for devices exchanging 59image data with applications. The 60<span class="structname">v4l2_pix_format</span> and <span class="structname">v4l2_pix_format_mplane 61</span> structures define the format and layout of an image in memory. 62The former is used with the single-planar API, while the latter is used with the 63multi-planar version (see <a class="xref" href="planar-apis.html" title="Single- and multi-planar APIs">the section called “Single- and multi-planar APIs”</a>). Image formats are 64negotiated with the <a class="link" href="vidioc-g-fmt.html" title="ioctl VIDIOC_G_FMT, VIDIOC_S_FMT, VIDIOC_TRY_FMT"><code class="constant">VIDIOC_S_FMT</code></a> ioctl. (The explanations here focus on video 65capturing and output, for overlay frame buffer formats see also 66<a class="link" href="vidioc-g-fbuf.html" title="ioctl VIDIOC_G_FBUF, VIDIOC_S_FBUF"><code class="constant">VIDIOC_G_FBUF</code></a>.)</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp1100345860"></a>Single-planar format structure</h2></div></div></div><div class="table"><a name="v4l2-pix-format"></a><p class="title"><b>Table 2.1. struct <span class="structname">v4l2_pix_format</span></b></p><div class="table-contents"><table summary="struct v4l2_pix_format" width="100%" border="0"><colgroup><col class="c1"><col class="c2"><col class="c3"></colgroup><tbody valign="top"><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>width</code></em></td><td valign="top">Image width in pixels.</td></tr><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>height</code></em></td><td valign="top">Image height in pixels. If <em class="structfield"><code>field</code></em> is 67 one of <code class="constant">V4L2_FIELD_TOP</code>, <code class="constant">V4L2_FIELD_BOTTOM</code> 68 or <code class="constant">V4L2_FIELD_ALTERNATE</code> then height refers to the 69 number of lines in the field, otherwise it refers to the number of 70 lines in the frame (which is twice the field height for interlaced 71 formats).</td></tr><tr><td colspan="3" valign="top">Applications set these fields to 72request an image size, drivers return the closest possible values. In 73case of planar formats the <em class="structfield"><code>width</code></em> and 74<em class="structfield"><code>height</code></em> applies to the largest plane. To 75avoid ambiguities drivers must return values rounded up to a multiple 76of the scale factor of any smaller planes. For example when the image 77format is YUV 4:2:0, <em class="structfield"><code>width</code></em> and 78<em class="structfield"><code>height</code></em> must be multiples of two.</td></tr><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>pixelformat</code></em></td><td valign="top">The pixel format or type of compression, set by the 79application. This is a little endian <a class="link" href="vidioc-enum-fmt.html#v4l2-fourcc">four character code</a>. V4L2 defines 80standard RGB formats in <a class="xref" href="packed-rgb.html#rgb-formats" title="Table 2.16. Packed RGB Image Formats">Table 2.16, “Packed RGB Image Formats”</a>, YUV formats in <a class="xref" href="yuv-formats.html" title="YUV Formats">the section called “YUV Formats”</a>, and reserved codes in <a class="xref" href="pixfmt-reserved.html#reserved-formats" title="Table 2.20. Reserved Image Formats">Table 2.20, “Reserved Image Formats”</a></td></tr><tr><td valign="top">enum <a class="link" href="field-order.html#v4l2-field" title="Table 3.9. enum v4l2_field">v4l2_field</a></td><td valign="top"><em class="structfield"><code>field</code></em></td><td valign="top">Video images are typically interlaced. Applications 81can request to capture or output only the top or bottom field, or both 82fields interlaced or sequentially stored in one buffer or alternating 83in separate buffers. Drivers return the actual field order selected. 84For more details on fields see <a class="xref" href="field-order.html" title="Field Order">the section called “Field Order”</a>.</td></tr><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>bytesperline</code></em></td><td valign="top">Distance in bytes between the leftmost pixels in two 85adjacent lines.</td></tr><tr><td colspan="3" valign="top"><p>Both applications and drivers 86can set this field to request padding bytes at the end of each line. 87Drivers however may ignore the value requested by the application, 88returning <em class="structfield"><code>width</code></em> times bytes per pixel or a 89larger value required by the hardware. That implies applications can 90just set this field to zero to get a reasonable 91default.</p><p>Video hardware may access padding bytes, 92therefore they must reside in accessible memory. Consider cases where 93padding bytes after the last line of an image cross a system page 94boundary. Input devices may write padding bytes, the value is 95undefined. Output devices ignore the contents of padding 96bytes.</p><p>When the image format is planar the 97<em class="structfield"><code>bytesperline</code></em> value applies to the first 98plane and is divided by the same factor as the 99<em class="structfield"><code>width</code></em> field for the other planes. For 100example the Cb and Cr planes of a YUV 4:2:0 image have half as many 101padding bytes following each line as the Y plane. To avoid ambiguities 102drivers must return a <em class="structfield"><code>bytesperline</code></em> value 103rounded up to a multiple of the scale factor.</p> 104<p>For compressed formats the <em class="structfield"><code>bytesperline</code></em> 105value makes no sense. Applications and drivers must set this to 0 in 106that case.</p></td></tr><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>sizeimage</code></em></td><td valign="top">Size in bytes of the buffer to hold a complete image, 107set by the driver. Usually this is 108<em class="structfield"><code>bytesperline</code></em> times 109<em class="structfield"><code>height</code></em>. When the image consists of variable 110length compressed data this is the maximum number of bytes required to 111hold an image.</td></tr><tr><td valign="top">enum <a class="link" href="ch02s05.html#v4l2-colorspace" title="Table 2.4. V4L2 Colorspaces">v4l2_colorspace</a></td><td valign="top"><em class="structfield"><code>colorspace</code></em></td><td valign="top">This information supplements the 112<em class="structfield"><code>pixelformat</code></em> and must be set by the driver for 113capture streams and by the application for output streams, 114see <a class="xref" href="colorspaces.html" title="Colorspaces">the section called “Colorspaces”</a>.</td></tr><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>priv</code></em></td><td valign="top"><p>This field indicates whether the remaining fields of the 115<span class="structname">v4l2_pix_format</span> structure, also called the extended 116fields, are valid. When set to <code class="constant">V4L2_PIX_FMT_PRIV_MAGIC</code>, it 117indicates that the extended fields have been correctly initialized. When set to 118any other value it indicates that the extended fields contain undefined values. 119</p> 120<p>Applications that wish to use the pixel format extended fields must first 121ensure that the feature is supported by querying the device for the 122<a class="link" href="querycap.html" title="Querying Capabilities"><code class="constant">V4L2_CAP_EXT_PIX_FORMAT</code></a> 123capability. If the capability isn't set the pixel format extended fields are not 124supported and using the extended fields will lead to undefined results.</p> 125<p>To use the extended fields, applications must set the 126<em class="structfield"><code>priv</code></em> field to 127<code class="constant">V4L2_PIX_FMT_PRIV_MAGIC</code>, initialize all the extended fields 128and zero the unused bytes of the <span class="structname">v4l2_format</span> 129<em class="structfield"><code>raw_data</code></em> field.</p> 130<p>When the <em class="structfield"><code>priv</code></em> field isn't set to 131<code class="constant">V4L2_PIX_FMT_PRIV_MAGIC</code> drivers must act as if all the 132extended fields were set to zero. On return drivers must set the 133<em class="structfield"><code>priv</code></em> field to 134<code class="constant">V4L2_PIX_FMT_PRIV_MAGIC</code> and all the extended fields to 135applicable values.</p></td></tr><tr><td valign="top">__u32</td><td valign="top"><em class="structfield"><code>flags</code></em></td><td valign="top">Flags set by the application or driver, see <a class="xref" href="pixfmt-reserved.html#format-flags" title="Table 2.21. Format Flags">Table 2.21, “Format Flags”</a>.</td></tr><tr><td valign="top">enum <a class="link" href="ch02s05.html#v4l2-ycbcr-encoding" title="Table 2.5. V4L2 Y'CbCr Encodings">v4l2_ycbcr_encoding</a></td><td valign="top"><em class="structfield"><code>ycbcr_enc</code></em></td><td valign="top">This information supplements the 136<em class="structfield"><code>colorspace</code></em> and must be set by the driver for 137capture streams and by the application for output streams, 138see <a class="xref" href="colorspaces.html" title="Colorspaces">the section called “Colorspaces”</a>.</td></tr><tr><td valign="top">enum <a class="link" href="ch02s05.html#v4l2-quantization" title="Table 2.6. V4L2 Quantization Methods">v4l2_quantization</a></td><td valign="top"><em class="structfield"><code>quantization</code></em></td><td valign="top">This information supplements the 139<em class="structfield"><code>colorspace</code></em> and must be set by the driver for 140capture streams and by the application for output streams, 141see <a class="xref" href="colorspaces.html" title="Colorspaces">the section called “Colorspaces”</a>.</td></tr></tbody></table></div></div><br class="table-break"></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="streaming-par.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="v4l2spec.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch02s02.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Streaming Parameters </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Multi-planar format structures</td></tr></table></div></body></html> 142