€•Œ(Œsphinx.addnodes”Œdocument”“”)”}”(Œ rawsource”Œ”Œchildren”]”(Œ translations”Œ LanguagesNode”“”)”}”(hhh]”(hŒ pending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ refdomain”Œstd”Œreftype”Œdoc”Œ reftarget”Œ4/translations/zh_CN/userspace-api/media/v4l/querycap”Œmodname”NŒ classname”NŒ refexplicit”ˆuŒtagname”hhh ubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ4/translations/zh_TW/userspace-api/media/v4l/querycap”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ4/translations/it_IT/userspace-api/media/v4l/querycap”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ4/translations/ja_JP/userspace-api/media/v4l/querycap”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ4/translations/ko_KR/userspace-api/media/v4l/querycap”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ4/translations/sp_SP/userspace-api/media/v4l/querycap”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h hhŒ _document”hŒsource”NŒline”NubhŒcomment”“”)”}”(hŒ8SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later”h]”hŒ8SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later”…””}”hh£sbah}”(h]”h ]”h"]”h$]”h&]”Œ xml:space”Œpreserve”uh1h¡hhhžhhŸŒN/var/lib/git/docbuild/linux/Documentation/userspace-api/media/v4l/querycap.rst”h KubhŒtarget”“”)”}”(hŒ .. _querycap:”h]”h}”(h]”h ]”h"]”h$]”h&]”Œrefid”Œquerycap”uh1h´h KhhhžhhŸh³ubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒQuerying Capabilities”h]”hŒQuerying Capabilities”…””}”(hhÉhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhhÄhžhhŸh³h KubhŒ paragraph”“”)”}”(hXBecause V4L2 covers a wide variety of devices not all aspects of the API are equally applicable to all types of devices. Furthermore devices of the same type have different capabilities and this specification permits the omission of a few complicated and less important parts of the API.”h]”hXBecause V4L2 covers a wide variety of devices not all aspects of the API are equally applicable to all types of devices. Furthermore devices of the same type have different capabilities and this specification permits the omission of a few complicated and less important parts of the API.”…””}”(hhÙhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh³h K hhÄhžhubhØ)”}”(hŒÓThe :ref:`VIDIOC_QUERYCAP` ioctl is available to check if the kernel device is compatible with this specification, and to query the :ref:`functions ` and :ref:`I/O methods ` supported by the device.”h]”(hŒThe ”…””}”(hhçhžhhŸNh Nubh)”}”(hŒ:ref:`VIDIOC_QUERYCAP`”h]”hŒinline”“”)”}”(hhñh]”hŒVIDIOC_QUERYCAP”…””}”(hhõhžhhŸNh Nubah}”(h]”h ]”(Œxref”Œstd”Œstd-ref”eh"]”h$]”h&]”uh1hóhhïubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”Œ userspace-api/media/v4l/querycap”Œ refdomain”jŒreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆŒ reftarget”Œvidioc_querycap”uh1hhŸh³h KhhçubhŒj ioctl is available to check if the kernel device is compatible with this specification, and to query the ”…””}”(hhçhžhhŸNh Nubh)”}”(hŒ:ref:`functions `”h]”hô)”}”(hjh]”hŒ functions”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”(hÿŒstd”Œstd-ref”eh"]”h$]”h&]”uh1hóhjubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”j&Œreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjŒdevices”uh1hhŸh³h KhhçubhŒ and ”…””}”(hhçhžhhŸNh Nubh)”}”(hŒ:ref:`I/O methods `”h]”hô)”}”(hj>h]”hŒ I/O methods”…””}”(hj@hžhhŸNh Nubah}”(h]”h ]”(hÿŒstd”Œstd-ref”eh"]”h$]”h&]”uh1hóhj<ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jJŒreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjŒio”uh1hhŸh³h KhhçubhŒ supported by the device.”…””}”(hhçhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh³h KhhÄhžhubhØ)”}”(hXJStarting with kernel version 3.1, :ref:`VIDIOC_QUERYCAP` will return the V4L2 API version used by the driver, with generally matches the Kernel version. 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There’s no need of using ”…””}”(hjfhžhhŸNh Nubh)”}”(hŒ:ref:`VIDIOC_QUERYCAP`”h]”hô)”}”(hj”h]”hŒVIDIOC_QUERYCAP”…””}”(hj–hžhhŸNh Nubah}”(h]”h ]”(hÿŒstd”Œstd-ref”eh"]”h$]”h&]”uh1hóhj’ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”j Œreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆjŒvidioc_querycap”uh1hhŸh³h KhjfubhŒF to check if a specific ioctl is supported, the V4L2 core now returns ”…””}”(hjfhžhhŸNh NubhŒliteral”“”)”}”(hŒ ``ENOTTY``”h]”hŒENOTTY”…””}”(hj¸hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j¶hjfubhŒ4 if a driver doesn’t provide support for an ioctl.”…””}”(hjfhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh³h KhhÄhžhubhØ)”}”(hXROther features can be queried by calling the respective ioctl, for example :ref:`VIDIOC_ENUMINPUT` to learn about the number, types and names of video connectors on the device. 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