mirror of https://gitee.com/openkylin/linux.git
683 lines
19 KiB
XML
683 lines
19 KiB
XML
<partinfo>
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<authorgroup>
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<author>
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<firstname>Michael</firstname>
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<surname>Schimek</surname>
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<othername role="mi">H</othername>
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<affiliation>
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<address>
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<email>mschimek@gmx.at</email>
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</address>
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</affiliation>
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</author>
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<author>
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<firstname>Bill</firstname>
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<surname>Dirks</surname>
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<!-- Commented until Bill opts in to be spammed.
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<affiliation>
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<address>
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<email>bill@thedirks.org</email>
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</address>
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</affiliation> -->
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<contrib>Original author of the V4L2 API and
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documentation.</contrib>
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</author>
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<author>
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<firstname>Hans</firstname>
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<surname>Verkuil</surname>
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<contrib>Designed and documented the VIDIOC_LOG_STATUS ioctl,
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the extended control ioctls, major parts of the sliced VBI API, the
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MPEG encoder and decoder APIs and the DV Timings API.</contrib>
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<affiliation>
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<address>
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<email>hverkuil@xs4all.nl</email>
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</address>
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</affiliation>
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</author>
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<author>
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<firstname>Martin</firstname>
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<surname>Rubli</surname>
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<!--
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<affiliation>
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<address>
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<email>martin_rubli@logitech.com</email>
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</address>
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</affiliation> -->
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<contrib>Designed and documented the VIDIOC_ENUM_FRAMESIZES
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and VIDIOC_ENUM_FRAMEINTERVALS ioctls.</contrib>
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</author>
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<author>
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<firstname>Andy</firstname>
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<surname>Walls</surname>
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<contrib>Documented the fielded V4L2_MPEG_STREAM_VBI_FMT_IVTV
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MPEG stream embedded, sliced VBI data format in this specification.
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</contrib>
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<affiliation>
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<address>
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<email>awalls@md.metrocast.net</email>
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</address>
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</affiliation>
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</author>
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<author>
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<firstname>Mauro</firstname>
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<surname>Carvalho Chehab</surname>
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<contrib>Documented libv4l, designed and added v4l2grab example,
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Remote Controller chapter.</contrib>
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<affiliation>
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<address>
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<email>m.chehab@samsung.com</email>
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</address>
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</affiliation>
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</author>
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<author>
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<firstname>Muralidharan</firstname>
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<surname>Karicheri</surname>
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<contrib>Documented the Digital Video timings API.</contrib>
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<affiliation>
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<address>
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<email>m-karicheri2@ti.com</email>
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</address>
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</affiliation>
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</author>
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<author>
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<firstname>Pawel</firstname>
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<surname>Osciak</surname>
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<contrib>Designed and documented the multi-planar API.</contrib>
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<affiliation>
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<address>
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<email>pawel AT osciak.com</email>
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</address>
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</affiliation>
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</author>
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<author>
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<firstname>Sakari</firstname>
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<surname>Ailus</surname>
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<contrib>Subdev selections API.</contrib>
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<affiliation>
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<address>
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<email>sakari.ailus@iki.fi</email>
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</address>
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</affiliation>
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</author>
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<author>
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<firstname>Antti</firstname>
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<surname>Palosaari</surname>
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<contrib>SDR API.</contrib>
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<affiliation>
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<address>
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<email>crope@iki.fi</email>
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</address>
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</affiliation>
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</author>
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</authorgroup>
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<copyright>
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<year>1999</year>
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<year>2000</year>
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<year>2001</year>
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<year>2002</year>
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<year>2003</year>
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<year>2004</year>
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<year>2005</year>
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<year>2006</year>
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<year>2007</year>
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<year>2008</year>
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<year>2009</year>
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<year>2010</year>
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<year>2011</year>
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<year>2012</year>
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<year>2013</year>
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<year>2014</year>
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<holder>Bill Dirks, Michael H. Schimek, Hans Verkuil, Martin
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Rubli, Andy Walls, Muralidharan Karicheri, Mauro Carvalho Chehab,
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Pawel Osciak</holder>
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</copyright>
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<legalnotice>
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<para>Except when explicitly stated as GPL, programming examples within
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this part can be used and distributed without restrictions.</para>
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</legalnotice>
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<revhistory>
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<!-- Put document revisions here, newest first. -->
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<!-- API revisions (changes and additions of defines, enums,
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structs, ioctls) must be noted in more detail in the history chapter
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(compat.xml), along with the possible impact on existing drivers and
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applications. -->
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<revision>
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<revnumber>3.15</revnumber>
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<date>2014-02-03</date>
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<authorinitials>hv, ap</authorinitials>
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<revremark>Update several sections of "Common API Elements": "Opening and Closing Devices"
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"Querying Capabilities", "Application Priority", "Video Inputs and Outputs", "Audio Inputs and Outputs"
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"Tuners and Modulators", "Video Standards" and "Digital Video (DV) Timings". Added SDR API.
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</revremark>
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</revision>
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<revision>
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<revnumber>3.14</revnumber>
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<date>2013-11-25</date>
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<authorinitials>rr</authorinitials>
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<revremark>Set width and height as unsigned on v4l2_rect.
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</revremark>
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</revision>
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<revision>
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<revnumber>3.11</revnumber>
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<date>2013-05-26</date>
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<authorinitials>hv</authorinitials>
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<revremark>Remove obsolete VIDIOC_DBG_G_CHIP_IDENT ioctl.
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</revremark>
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</revision>
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<revision>
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<revnumber>3.10</revnumber>
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<date>2013-03-25</date>
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<authorinitials>hv</authorinitials>
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<revremark>Remove obsolete and unused DV_PRESET ioctls:
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VIDIOC_G_DV_PRESET, VIDIOC_S_DV_PRESET, VIDIOC_QUERY_DV_PRESET and
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VIDIOC_ENUM_DV_PRESET. Remove the related v4l2_input/output capability
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flags V4L2_IN_CAP_PRESETS and V4L2_OUT_CAP_PRESETS. Added VIDIOC_DBG_G_CHIP_INFO.
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</revremark>
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</revision>
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<revision>
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<revnumber>3.9</revnumber>
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<date>2012-12-03</date>
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<authorinitials>sa, sn</authorinitials>
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<revremark>Added timestamp types to v4l2_buffer.
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Added V4L2_EVENT_CTRL_CH_RANGE control event changes flag.
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</revremark>
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</revision>
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<revision>
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<revnumber>3.6</revnumber>
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<date>2012-07-02</date>
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<authorinitials>hv</authorinitials>
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<revremark>Added VIDIOC_ENUM_FREQ_BANDS.
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</revremark>
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</revision>
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<revision>
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<revnumber>3.5</revnumber>
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<date>2012-05-07</date>
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<authorinitials>sa, sn, hv</authorinitials>
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<revremark>Added V4L2_CTRL_TYPE_INTEGER_MENU and V4L2 subdev
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selections API. Improved the description of V4L2_CID_COLORFX
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control, added V4L2_CID_COLORFX_CBCR control.
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Added camera controls V4L2_CID_AUTO_EXPOSURE_BIAS,
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V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE, V4L2_CID_IMAGE_STABILIZATION,
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V4L2_CID_ISO_SENSITIVITY, V4L2_CID_ISO_SENSITIVITY_AUTO,
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V4L2_CID_EXPOSURE_METERING, V4L2_CID_SCENE_MODE,
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V4L2_CID_3A_LOCK, V4L2_CID_AUTO_FOCUS_START,
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V4L2_CID_AUTO_FOCUS_STOP, V4L2_CID_AUTO_FOCUS_STATUS
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and V4L2_CID_AUTO_FOCUS_RANGE.
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Added VIDIOC_ENUM_DV_TIMINGS, VIDIOC_QUERY_DV_TIMINGS and
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VIDIOC_DV_TIMINGS_CAP.
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</revremark>
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</revision>
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<revision>
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<revnumber>3.4</revnumber>
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<date>2012-01-25</date>
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<authorinitials>sn</authorinitials>
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<revremark>Added <link linkend="jpeg-controls">JPEG compression
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control class.</link>
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</revremark>
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</revision>
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<revision>
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<revnumber>3.3</revnumber>
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<date>2012-01-11</date>
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<authorinitials>hv</authorinitials>
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<revremark>Added device_caps field to struct v4l2_capabilities.</revremark>
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</revision>
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<revision>
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<revnumber>3.2</revnumber>
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<date>2011-08-26</date>
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<authorinitials>hv</authorinitials>
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<revremark>Added V4L2_CTRL_FLAG_VOLATILE.</revremark>
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</revision>
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<revision>
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<revnumber>3.1</revnumber>
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<date>2011-06-27</date>
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<authorinitials>mcc, po, hv</authorinitials>
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<revremark>Documented that VIDIOC_QUERYCAP now returns a per-subsystem version instead of a per-driver one.
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Standardize an error code for invalid ioctl.
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Added V4L2_CTRL_TYPE_BITMASK.</revremark>
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</revision>
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<revision>
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<revnumber>2.6.39</revnumber>
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<date>2011-03-01</date>
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<authorinitials>mcc, po</authorinitials>
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<revremark>Removed VIDIOC_*_OLD from videodev2.h header and update it to reflect latest changes. Added the <link linkend="planar-apis">multi-planar API</link>.</revremark>
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</revision>
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<revision>
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<revnumber>2.6.37</revnumber>
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<date>2010-08-06</date>
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<authorinitials>hv</authorinitials>
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<revremark>Removed obsolete vtx (videotext) API.</revremark>
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</revision>
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<revision>
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<revnumber>2.6.33</revnumber>
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<date>2009-12-03</date>
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<authorinitials>mk</authorinitials>
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<revremark>Added documentation for the Digital Video timings API.</revremark>
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</revision>
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<revision>
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<revnumber>2.6.32</revnumber>
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<date>2009-08-31</date>
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<authorinitials>mcc</authorinitials>
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<revremark>Now, revisions will match the kernel version where
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the V4L2 API changes will be used by the Linux Kernel.
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Also added Remote Controller chapter.</revremark>
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</revision>
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<revision>
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<revnumber>0.29</revnumber>
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<date>2009-08-26</date>
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<authorinitials>ev</authorinitials>
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<revremark>Added documentation for string controls and for FM Transmitter controls.</revremark>
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</revision>
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<revision>
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<revnumber>0.28</revnumber>
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<date>2009-08-26</date>
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<authorinitials>gl</authorinitials>
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<revremark>Added V4L2_CID_BAND_STOP_FILTER documentation.</revremark>
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</revision>
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<revision>
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<revnumber>0.27</revnumber>
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<date>2009-08-15</date>
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<authorinitials>mcc</authorinitials>
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<revremark>Added libv4l and Remote Controller documentation;
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added v4l2grab and keytable application examples.</revremark>
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</revision>
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<revision>
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<revnumber>0.26</revnumber>
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<date>2009-07-23</date>
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<authorinitials>hv</authorinitials>
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<revremark>Finalized the RDS capture API. Added modulator and RDS encoder
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capabilities. Added support for string controls.</revremark>
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</revision>
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<revision>
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<revnumber>0.25</revnumber>
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<date>2009-01-18</date>
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<authorinitials>hv</authorinitials>
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<revremark>Added pixel formats VYUY, NV16 and NV61, and changed
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the debug ioctls VIDIOC_DBG_G/S_REGISTER and VIDIOC_DBG_G_CHIP_IDENT.
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Added camera controls V4L2_CID_ZOOM_ABSOLUTE, V4L2_CID_ZOOM_RELATIVE,
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V4L2_CID_ZOOM_CONTINUOUS and V4L2_CID_PRIVACY.</revremark>
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</revision>
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<revision>
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<revnumber>0.24</revnumber>
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<date>2008-03-04</date>
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<authorinitials>mhs</authorinitials>
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<revremark>Added pixel formats Y16 and SBGGR16, new controls
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and a camera controls class. Removed VIDIOC_G/S_MPEGCOMP.</revremark>
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</revision>
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<revision>
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<revnumber>0.23</revnumber>
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<date>2007-08-30</date>
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<authorinitials>mhs</authorinitials>
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<revremark>Fixed a typo in VIDIOC_DBG_G/S_REGISTER.
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Clarified the byte order of packed pixel formats.</revremark>
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</revision>
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<revision>
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<revnumber>0.22</revnumber>
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<date>2007-08-29</date>
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<authorinitials>mhs</authorinitials>
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<revremark>Added the Video Output Overlay interface, new MPEG
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controls, V4L2_FIELD_INTERLACED_TB and V4L2_FIELD_INTERLACED_BT,
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VIDIOC_DBG_G/S_REGISTER, VIDIOC_(TRY_)ENCODER_CMD,
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VIDIOC_G_CHIP_IDENT, VIDIOC_G_ENC_INDEX, new pixel formats.
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Clarifications in the cropping chapter, about RGB pixel formats, the
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mmap(), poll(), select(), read() and write() functions. Typographical
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fixes.</revremark>
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</revision>
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<revision>
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<revnumber>0.21</revnumber>
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<date>2006-12-19</date>
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<authorinitials>mhs</authorinitials>
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<revremark>Fixed a link in the VIDIOC_G_EXT_CTRLS section.</revremark>
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</revision>
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<revision>
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<revnumber>0.20</revnumber>
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<date>2006-11-24</date>
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<authorinitials>mhs</authorinitials>
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<revremark>Clarified the purpose of the audioset field in
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struct v4l2_input and v4l2_output.</revremark>
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</revision>
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<revision>
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<revnumber>0.19</revnumber>
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<date>2006-10-19</date>
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<authorinitials>mhs</authorinitials>
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<revremark>Documented V4L2_PIX_FMT_RGB444.</revremark>
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</revision>
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<revision>
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<revnumber>0.18</revnumber>
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<date>2006-10-18</date>
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<authorinitials>mhs</authorinitials>
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<revremark>Added the description of extended controls by Hans
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Verkuil. Linked V4L2_PIX_FMT_MPEG to V4L2_CID_MPEG_STREAM_TYPE.</revremark>
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</revision>
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<revision>
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<revnumber>0.17</revnumber>
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<date>2006-10-12</date>
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<authorinitials>mhs</authorinitials>
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<revremark>Corrected V4L2_PIX_FMT_HM12 description.</revremark>
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</revision>
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<revision>
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<revnumber>0.16</revnumber>
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<date>2006-10-08</date>
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<authorinitials>mhs</authorinitials>
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<revremark>VIDIOC_ENUM_FRAMESIZES and
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VIDIOC_ENUM_FRAMEINTERVALS are now part of the API.</revremark>
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</revision>
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<revision>
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<revnumber>0.15</revnumber>
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<date>2006-09-23</date>
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<authorinitials>mhs</authorinitials>
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<revremark>Cleaned up the bibliography, added BT.653 and
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BT.1119. capture.c/start_capturing() for user pointer I/O did not
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initialize the buffer index. Documented the V4L MPEG and MJPEG
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VID_TYPEs and V4L2_PIX_FMT_SBGGR8. Updated the list of reserved pixel
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formats. See the history chapter for API changes.</revremark>
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</revision>
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<revision>
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<revnumber>0.14</revnumber>
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<date>2006-09-14</date>
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<authorinitials>mr</authorinitials>
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<revremark>Added VIDIOC_ENUM_FRAMESIZES and
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VIDIOC_ENUM_FRAMEINTERVALS proposal for frame format enumeration of
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digital devices.</revremark>
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</revision>
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<revision>
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<revnumber>0.13</revnumber>
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<date>2006-04-07</date>
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<authorinitials>mhs</authorinitials>
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<revremark>Corrected the description of struct v4l2_window
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clips. New V4L2_STD_ and V4L2_TUNER_MODE_LANG1_LANG2
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defines.</revremark>
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</revision>
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<revision>
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<revnumber>0.12</revnumber>
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<date>2006-02-03</date>
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<authorinitials>mhs</authorinitials>
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<revremark>Corrected the description of struct
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v4l2_captureparm and v4l2_outputparm.</revremark>
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</revision>
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<revision>
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<revnumber>0.11</revnumber>
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<date>2006-01-27</date>
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<authorinitials>mhs</authorinitials>
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<revremark>Improved the description of struct
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v4l2_tuner.</revremark>
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</revision>
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<revision>
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<revnumber>0.10</revnumber>
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<date>2006-01-10</date>
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<authorinitials>mhs</authorinitials>
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<revremark>VIDIOC_G_INPUT and VIDIOC_S_PARM
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clarifications.</revremark>
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</revision>
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<revision>
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<revnumber>0.9</revnumber>
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<date>2005-11-27</date>
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<authorinitials>mhs</authorinitials>
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<revremark>Improved the 525 line numbering diagram. Hans
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Verkuil and I rewrote the sliced VBI section. He also contributed a
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VIDIOC_LOG_STATUS page. Fixed VIDIOC_S_STD call in the video standard
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selection example. Various updates.</revremark>
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</revision>
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<revision>
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<revnumber>0.8</revnumber>
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<date>2004-10-04</date>
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<authorinitials>mhs</authorinitials>
|
|
<revremark>Somehow a piece of junk slipped into the capture
|
|
example, removed.</revremark>
|
|
</revision>
|
|
|
|
<revision>
|
|
<revnumber>0.7</revnumber>
|
|
<date>2004-09-19</date>
|
|
<authorinitials>mhs</authorinitials>
|
|
<revremark>Fixed video standard selection, control
|
|
enumeration, downscaling and aspect example. Added read and user
|
|
pointer i/o to video capture example.</revremark>
|
|
</revision>
|
|
|
|
<revision>
|
|
<revnumber>0.6</revnumber>
|
|
<date>2004-08-01</date>
|
|
<authorinitials>mhs</authorinitials>
|
|
<revremark>v4l2_buffer changes, added video capture example,
|
|
various corrections.</revremark>
|
|
</revision>
|
|
|
|
<revision>
|
|
<revnumber>0.5</revnumber>
|
|
<date>2003-11-05</date>
|
|
<authorinitials>mhs</authorinitials>
|
|
<revremark>Pixel format erratum.</revremark>
|
|
</revision>
|
|
|
|
<revision>
|
|
<revnumber>0.4</revnumber>
|
|
<date>2003-09-17</date>
|
|
<authorinitials>mhs</authorinitials>
|
|
<revremark>Corrected source and Makefile to generate a PDF.
|
|
SGML fixes. Added latest API changes. Closed gaps in the history
|
|
chapter.</revremark>
|
|
</revision>
|
|
|
|
<revision>
|
|
<revnumber>0.3</revnumber>
|
|
<date>2003-02-05</date>
|
|
<authorinitials>mhs</authorinitials>
|
|
<revremark>Another draft, more corrections.</revremark>
|
|
</revision>
|
|
|
|
<revision>
|
|
<revnumber>0.2</revnumber>
|
|
<date>2003-01-15</date>
|
|
<authorinitials>mhs</authorinitials>
|
|
<revremark>Second draft, with corrections pointed out by Gerd
|
|
Knorr.</revremark>
|
|
</revision>
|
|
|
|
<revision>
|
|
<revnumber>0.1</revnumber>
|
|
<date>2002-12-01</date>
|
|
<authorinitials>mhs</authorinitials>
|
|
<revremark>First draft, based on documentation by Bill Dirks
|
|
and discussions on the V4L mailing list.</revremark>
|
|
</revision>
|
|
</revhistory>
|
|
</partinfo>
|
|
|
|
<title>Video for Linux Two API Specification</title>
|
|
<subtitle>Revision 3.14</subtitle>
|
|
|
|
<chapter id="common">
|
|
&sub-common;
|
|
</chapter>
|
|
|
|
<chapter id="pixfmt">
|
|
&sub-pixfmt;
|
|
</chapter>
|
|
|
|
<chapter id="io">
|
|
&sub-io;
|
|
</chapter>
|
|
|
|
<chapter id="devices">
|
|
<title>Interfaces</title>
|
|
|
|
<section id="capture"> &sub-dev-capture; </section>
|
|
<section id="overlay"> &sub-dev-overlay; </section>
|
|
<section id="output"> &sub-dev-output; </section>
|
|
<section id="osd"> &sub-dev-osd; </section>
|
|
<section id="codec"> &sub-dev-codec; </section>
|
|
<section id="effect"> &sub-dev-effect; </section>
|
|
<section id="raw-vbi"> &sub-dev-raw-vbi; </section>
|
|
<section id="sliced"> &sub-dev-sliced-vbi; </section>
|
|
<section id="ttx"> &sub-dev-teletext; </section>
|
|
<section id="radio"> &sub-dev-radio; </section>
|
|
<section id="rds"> &sub-dev-rds; </section>
|
|
<section id="sdr"> &sub-dev-sdr; </section>
|
|
<section id="event"> &sub-dev-event; </section>
|
|
<section id="subdev"> &sub-dev-subdev; </section>
|
|
</chapter>
|
|
|
|
<chapter id="driver">
|
|
&sub-driver;
|
|
</chapter>
|
|
|
|
<chapter id="libv4l">
|
|
&sub-libv4l;
|
|
</chapter>
|
|
|
|
<chapter id="compat">
|
|
&sub-compat;
|
|
</chapter>
|
|
|
|
<appendix id="user-func">
|
|
<title>Function Reference</title>
|
|
|
|
<!-- Keep this alphabetically sorted. -->
|
|
|
|
&sub-close;
|
|
&sub-ioctl;
|
|
<!-- All ioctls go here. -->
|
|
&sub-create-bufs;
|
|
&sub-cropcap;
|
|
&sub-dbg-g-chip-info;
|
|
&sub-dbg-g-register;
|
|
&sub-decoder-cmd;
|
|
&sub-dqevent;
|
|
&sub-dv-timings-cap;
|
|
&sub-encoder-cmd;
|
|
&sub-enumaudio;
|
|
&sub-enumaudioout;
|
|
&sub-enum-dv-timings;
|
|
&sub-enum-fmt;
|
|
&sub-enum-framesizes;
|
|
&sub-enum-frameintervals;
|
|
&sub-enum-freq-bands;
|
|
&sub-enuminput;
|
|
&sub-enumoutput;
|
|
&sub-enumstd;
|
|
&sub-expbuf;
|
|
&sub-g-audio;
|
|
&sub-g-audioout;
|
|
&sub-g-crop;
|
|
&sub-g-ctrl;
|
|
&sub-g-dv-timings;
|
|
&sub-g-enc-index;
|
|
&sub-g-ext-ctrls;
|
|
&sub-g-fbuf;
|
|
&sub-g-fmt;
|
|
&sub-g-frequency;
|
|
&sub-g-input;
|
|
&sub-g-jpegcomp;
|
|
&sub-g-modulator;
|
|
&sub-g-output;
|
|
&sub-g-parm;
|
|
&sub-g-priority;
|
|
&sub-g-selection;
|
|
&sub-g-sliced-vbi-cap;
|
|
&sub-g-std;
|
|
&sub-g-tuner;
|
|
&sub-log-status;
|
|
&sub-overlay;
|
|
&sub-prepare-buf;
|
|
&sub-qbuf;
|
|
&sub-querybuf;
|
|
&sub-querycap;
|
|
&sub-queryctrl;
|
|
&sub-query-dv-timings;
|
|
&sub-querystd;
|
|
&sub-reqbufs;
|
|
&sub-s-hw-freq-seek;
|
|
&sub-streamon;
|
|
&sub-subdev-enum-frame-interval;
|
|
&sub-subdev-enum-frame-size;
|
|
&sub-subdev-enum-mbus-code;
|
|
&sub-subdev-g-crop;
|
|
&sub-subdev-g-edid;
|
|
&sub-subdev-g-fmt;
|
|
&sub-subdev-g-frame-interval;
|
|
&sub-subdev-g-selection;
|
|
&sub-subscribe-event;
|
|
<!-- End of ioctls. -->
|
|
&sub-mmap;
|
|
&sub-munmap;
|
|
&sub-open;
|
|
&sub-poll;
|
|
&sub-read;
|
|
&sub-select;
|
|
&sub-write;
|
|
</appendix>
|
|
|
|
<appendix>
|
|
<title>Common definitions for V4L2 and V4L2 subdev interfaces</title>
|
|
&sub-selections-common;
|
|
</appendix>
|
|
|
|
<appendix id="videodev">
|
|
<title>Video For Linux Two Header File</title>
|
|
&sub-videodev2-h;
|
|
</appendix>
|
|
|
|
<appendix id="capture-example">
|
|
<title>Video Capture Example</title>
|
|
&sub-capture-c;
|
|
</appendix>
|
|
|
|
<appendix id="v4l2grab-example">
|
|
<title>Video Grabber example using libv4l</title>
|
|
<para>This program demonstrates how to grab V4L2 images in ppm format by
|
|
using libv4l handlers. The advantage is that this grabber can potentially work
|
|
with any V4L2 driver.</para>
|
|
&sub-v4l2grab-c;
|
|
</appendix>
|
|
|
|
&sub-media-indices;
|
|
|
|
&sub-biblio;
|
|
|