€•ºWŒsphinx.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”Œ;/translations/zh_CN/userspace-api/media/v4l/vidioc-querybuf”Œmodname”NŒ classname”NŒ refexplicit”ˆuŒtagname”hhh ubh)�”}”(hhh]”hŒChinese (Traditional)”…”�”}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ;/translations/zh_TW/userspace-api/media/v4l/vidioc-querybuf”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)�”}”(hhh]”hŒItalian”…”�”}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ;/translations/it_IT/userspace-api/media/v4l/vidioc-querybuf”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)�”}”(hhh]”hŒJapanese”…”�”}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ;/translations/ja_JP/userspace-api/media/v4l/vidioc-querybuf”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)�”}”(hhh]”hŒKorean”…”�”}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ;/translations/ko_KR/userspace-api/media/v4l/vidioc-querybuf”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)�”}”(hhh]”hŒPortuguese (Brazilian)”…”�”}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ;/translations/pt_BR/userspace-api/media/v4l/vidioc-querybuf”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)�”}”(hhh]”hŒSpanish”…”�”}”hh–sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ;/translations/sp_SP/userspace-api/media/v4l/vidioc-querybuf”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”uh1hµhhh²hh³ŒU/var/lib/git/docbuild/linux/Documentation/userspace-api/media/v4l/vidioc-querybuf.rst”h´KubhŒtarget”“”)�”}”(hŒ.. _VIDIOC_QUERYBUF:”h]”h}”(h]”h ]”h"]”h$]”h&]”Œrefid”Œvidioc-querybuf”uh1hÈh´Khhh²hh³hÇubhŒsection”“”)�”}”(hhh]”(hŒtitle”“”)�”}”(hŒioctl VIDIOC_QUERYBUF”h]”hŒioctl VIDIOC_QUERYBUF”…”�”}”(hhÝh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhhØh²hh³hÇh´Kubh×)�”}”(hhh]”(hÜ)�”}”(hŒName”h]”hŒName”…”�”}”(hhîh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhhëh²hh³hÇh´K ubhŒ paragraph”“”)�”}”(hŒ.VIDIOC_QUERYBUF - Query the status of a buffer”h]”hŒ.VIDIOC_QUERYBUF - Query the status of a buffer”…”�”}”(hhþh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´K hhëh²hubeh}”(h]”Œname”ah ]”h"]”Œname”ah$]”h&]”uh1hÖhhØh²hh³hÇh´K ubh×)�”}”(hhh]”(hÜ)�”}”(hŒSynopsis”h]”hŒSynopsis”…”�”}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhjh²hh³hÇh´KubhŒindex”“”)�”}”(hhh]”h}”(h]”h ]”h"]”h$]”h&]”Œentries”]”(Œsingle”ŒV4L.VIDIOC_QUERYBUF (C macro)”Œc.V4L.VIDIOC_QUERYBUF”hNt”auh1j%hjh²hh³Nh´NubhŒdesc”“”)�”}”(hhh]”(hŒdesc_signature”“”)�”}”(hŒVIDIOC_QUERYBUF”h]”hŒdesc_signature_line”“”)�”}”(hŒVIDIOC_QUERYBUF”h]”hŒ desc_name”“”)�”}”(hŒVIDIOC_QUERYBUF”h]”hŒ desc_sig_name”“”)�”}”(hj?h]”hŒVIDIOC_QUERYBUF”…”�”}”(hjOh²hh³Nh´Nubah}”(h]”h ]”Œn”ah"]”h$]”h&]”uh1jMhjIubah}”(h]”h ]”(Œsig-name”Œdescname”eh"]”h$]”h&]”hÅhÆuh1jGhjCh²hh³hÇh´Kubah}”(h]”h ]”h"]”h$]”h&]”hÅhÆŒ add_permalink”ˆuh1jAŒsphinx_line_type”Œ declarator”hj=h²hh³hÇh´Kubah}”(h]”j4ah ]”(Œsig”Œ sig-object”eh"]”h$]”h&]”Œ is_multiline”ˆŒ _toc_parts”)Œ _toc_name”huh1j;h³hÇh´Khj8h²hubhŒ desc_content”“”)�”}”(hhh]”h}”(h]”h ]”h"]”h$]”h&]”uh1jyhj8h²hh³hÇh´Kubeh}”(h]”h ]”(Œc”Œmacro”eh"]”h$]”h&]”Œdomain”j‡Œobjtype”jˆŒdesctype”jˆŒnoindex”‰Œ noindexentry”‰Œnocontentsentry”‰uh1j6h²hhjh³Nh´Nubhý)�”}”(hŒ@``int ioctl(int fd, VIDIOC_QUERYBUF, struct v4l2_buffer *argp)``”h]”hŒliteral”“”)�”}”(hj”h]”hŒ` I/O method. It can be used to query the status of a buffer at any time after buffers have been allocated with the :ref:`VIDIOC_REQBUFS` ioctl.”h]”(hŒThis ioctl is part of the ”…”�”}”(hj¶h²hh³Nh´Nubh)�”}”(hŒ:ref:`streaming `”h]”hŒinline”“”)�”}”(hjÀh]”hŒ streaming”…”�”}”(hjÄh²hh³Nh´Nubah}”(h]”h ]”(jŒstd”Œstd-ref”eh"]”h$]”h&]”uh1jÂhj¾ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jÎŒreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆj$Œmmap”uh1hh³hÇh´K"hj¶ubhŒs I/O method. It can be used to query the status of a buffer at any time after buffers have been allocated with the ”…”�”}”(hj¶h²hh³Nh´Nubh)�”}”(hŒ:ref:`VIDIOC_REQBUFS`”h]”jÃ)�”}”(hjæh]”hŒVIDIOC_REQBUFS”…”�”}”(hjèh²hh³Nh´Nubah}”(h]”h ]”(jŒstd”Œstd-ref”eh"]”h$]”h&]”uh1jÂhjäubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jòŒreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆj$Œvidioc_reqbufs”uh1hh³hÇh´K"hj¶ubhŒ ioctl.”…”�”}”(hj¶h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´K"hj¥h²hubhý)�”}”(hX4Applications set the ``type`` field of a struct :c:type:`v4l2_buffer` to the same buffer type as was previously used with struct :c:type:`v4l2_format` ``type`` and struct :c:type:`v4l2_requestbuffers` ``type``, and the ``index`` field. Valid index numbers range from zero to the number of buffers allocated with :ref:`VIDIOC_REQBUFS` (struct :c:type:`v4l2_requestbuffers` ``count``) minus one. The ``reserved`` and ``reserved2`` fields must be set to 0. When using the :ref:`multi-planar API `, the ``m.planes`` field must contain a userspace pointer to an array of struct :c:type:`v4l2_plane` and the ``length`` field has to be set to the number of elements in that array. After calling :ref:`VIDIOC_QUERYBUF` with a pointer to this structure drivers return an error code or fill the rest of the structure.”h]”(hŒApplications set the ”…”�”}”(hjh²hh³Nh´Nubj—)�”}”(hŒ``type``”h]”hŒtype”…”�”}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjubhŒ field of a struct ”…”�”}”(hjh²hh³Nh´Nubh)�”}”(hŒ:c:type:`v4l2_buffer`”h]”j—)�”}”(hj*h]”hŒ v4l2_buffer”…”�”}”(hj,h²hh³Nh´Nubah}”(h]”h ]”(jj‡Œc-type”eh"]”h$]”h&]”uh1j–hj(ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”j‡Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jjj$Œ v4l2_buffer”uh1hh³hÇh´K&hjubhŒ< to the same buffer type as was previously used with struct ”…”�”}”(hjh²hh³Nh´Nubh)�”}”(hŒ:c:type:`v4l2_format`”h]”j—)�”}”(hjMh]”hŒ v4l2_format”…”�”}”(hjOh²hh³Nh´Nubah}”(h]”h ]”(jj‡Œc-type”eh"]”h$]”h&]”uh1j–hjKubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”j‡Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jjj$Œ v4l2_format”uh1hh³hÇh´K&hjubhŒ ”…”�”}”(hjh²hh³Nh´Nubj—)�”}”(hŒ``type``”h]”hŒtype”…”�”}”(hjnh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjubhŒ and struct ”…”�”}”(hjh²hh³Nh´Nubh)�”}”(hŒ:c:type:`v4l2_requestbuffers`”h]”j—)�”}”(hj‚h]”hŒv4l2_requestbuffers”…”�”}”(hj„h²hh³Nh´Nubah}”(h]”h ]”(jj‡Œc-type”eh"]”h$]”h&]”uh1j–hj€ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”j‡Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jjj$Œv4l2_requestbuffers”uh1hh³hÇh´K&hjubhŒ ”…”�”}”hjsbj—)�”}”(hŒ``type``”h]”hŒtype”…”�”}”(hj£h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjubhŒ , and the ”…”�”}”(hjh²hh³Nh´Nubj—)�”}”(hŒ ``index``”h]”hŒindex”…”�”}”(hjµh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjubhŒT field. Valid index numbers range from zero to the number of buffers allocated with ”…”�”}”(hjh²hh³Nh´Nubh)�”}”(hŒ:ref:`VIDIOC_REQBUFS`”h]”jÃ)�”}”(hjÉh]”hŒVIDIOC_REQBUFS”…”�”}”(hjËh²hh³Nh´Nubah}”(h]”h ]”(jŒstd”Œstd-ref”eh"]”h$]”h&]”uh1jÂhjÇubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jÕŒreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆj$Œvidioc_reqbufs”uh1hh³hÇh´K&hjubhŒ (struct ”…”�”}”(hjh²hh³Nh´Nubh)�”}”(hŒ:c:type:`v4l2_requestbuffers`”h]”j—)�”}”(hjíh]”hŒv4l2_requestbuffers”…”�”}”(hjïh²hh³Nh´Nubah}”(h]”h ]”(jj‡Œc-type”eh"]”h$]”h&]”uh1j–hjëubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”j‡Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jjj$Œv4l2_requestbuffers”uh1hh³hÇh´K&hjubhŒ ”…”�”}”hjsbj—)�”}”(hŒ ``count``”h]”hŒcount”…”�”}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjubhŒ) minus one. The ”…”�”}”(hjh²hh³Nh´Nubj—)�”}”(hŒ ``reserved``”h]”hŒreserved”…”�”}”(hj h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjubhŒ and ”…”�”}”(hjh²hh³Nh´Nubj—)�”}”(hŒ ``reserved2``”h]”hŒ reserved2”…”�”}”(hj2h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjubhŒ) fields must be set to 0. When using the ”…”�”}”(hjh²hh³Nh´Nubh)�”}”(hŒ%:ref:`multi-planar API `”h]”jÃ)�”}”(hjFh]”hŒmulti-planar API”…”�”}”(hjHh²hh³Nh´Nubah}”(h]”h ]”(jŒstd”Œstd-ref”eh"]”h$]”h&]”uh1jÂhjDubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jRŒreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆj$Œ planar-apis”uh1hh³hÇh´K&hjubhŒ, the ”…”�”}”(hjh²hh³Nh´Nubj—)�”}”(hŒ ``m.planes``”h]”hŒm.planes”…”�”}”(hjhh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjubhŒ> field must contain a userspace pointer to an array of struct ”…”�”}”(hjh²hh³Nh´Nubh)�”}”(hŒ:c:type:`v4l2_plane`”h]”j—)�”}”(hj|h]”hŒ v4l2_plane”…”�”}”(hj~h²hh³Nh´Nubah}”(h]”h ]”(jj‡Œc-type”eh"]”h$]”h&]”uh1j–hjzubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”j‡Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jjj$Œ v4l2_plane”uh1hh³hÇh´K&hjubhŒ and the ”…”�”}”(hjh²hh³Nh´Nubj—)�”}”(hŒ ``length``”h]”hŒlength”…”�”}”(hj�h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjubhŒL field has to be set to the number of elements in that array. After calling ”…”�”}”(hjh²hh³Nh´Nubh)�”}”(hŒ:ref:`VIDIOC_QUERYBUF`”h]”jÃ)�”}”(hj±h]”hŒVIDIOC_QUERYBUF”…”�”}”(hj³h²hh³Nh´Nubah}”(h]”h ]”(jŒstd”Œstd-ref”eh"]”h$]”h&]”uh1jÂhj¯ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”j½Œreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆj$Œvidioc_querybuf”uh1hh³hÇh´K&hjubhŒa with a pointer to this structure drivers return an error code or fill the rest of the structure.”…”�”}”(hjh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hüh³hÇh´K&hj¥h²hubhý)�”}”(hX¯In the ``flags`` field the ``V4L2_BUF_FLAG_MAPPED``, ``V4L2_BUF_FLAG_PREPARED``, ``V4L2_BUF_FLAG_QUEUED`` and ``V4L2_BUF_FLAG_DONE`` flags will be valid. The ``memory`` field will be set to the current I/O method. For the single-planar API, the ``m.offset`` contains the offset of the buffer from the start of the device memory, the ``length`` field its size. For the multi-planar API, fields ``m.mem_offset`` and ``length`` in the ``m.planes`` array elements will be used instead and the ``length`` field of struct :c:type:`v4l2_buffer` is set to the number of filled-in array elements. The driver may or may not set the remaining fields and flags, they are meaningless in this context.”h]”(hŒIn the ”…”�”}”(hjÙh²hh³Nh´Nubj—)�”}”(hŒ ``flags``”h]”hŒflags”…”�”}”(hjáh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjÙubhŒ field the ”…”�”}”(hjÙh²hh³Nh´Nubj—)�”}”(hŒ``V4L2_BUF_FLAG_MAPPED``”h]”hŒV4L2_BUF_FLAG_MAPPED”…”�”}”(hjóh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjÙubhŒ, ”…”�”}”(hjÙh²hh³Nh´Nubj—)�”}”(hŒ``V4L2_BUF_FLAG_PREPARED``”h]”hŒV4L2_BUF_FLAG_PREPARED”…”�”}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjÙubhŒ, ”…”�”}”(hjÙh²hh³Nh´Nubj—)�”}”(hŒ``V4L2_BUF_FLAG_QUEUED``”h]”hŒV4L2_BUF_FLAG_QUEUED”…”�”}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjÙubhŒ and ”…”�”}”(hjÙh²hh³Nh´Nubj—)�”}”(hŒ``V4L2_BUF_FLAG_DONE``”h]”hŒV4L2_BUF_FLAG_DONE”…”�”}”(hj)h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjÙubhŒ flags will be valid. The ”…”�”}”(hjÙh²hh³Nh´Nubj—)�”}”(hŒ ``memory``”h]”hŒmemory”…”�”}”(hj;h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjÙubhŒM field will be set to the current I/O method. For the single-planar API, the ”…”�”}”(hjÙh²hh³Nh´Nubj—)�”}”(hŒ ``m.offset``”h]”hŒm.offset”…”�”}”(hjMh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjÙubhŒL contains the offset of the buffer from the start of the device memory, the ”…”�”}”(hjÙh²hh³Nh´Nubj—)�”}”(hŒ ``length``”h]”hŒlength”…”�”}”(hj_h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjÙubhŒ2 field its size. For the multi-planar API, fields ”…”�”}”(hjÙh²hh³Nh´Nubj—)�”}”(hŒ``m.mem_offset``”h]”hŒ m.mem_offset”…”�”}”(hjqh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjÙubhŒ and ”…”�”}”(hjÙh²hh³Nh´Nubj—)�”}”(hŒ ``length``”h]”hŒlength”…”�”}”(hjƒh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjÙubhŒ in the ”…”�”}”(hjÙh²hh³Nh´Nubj—)�”}”(hŒ ``m.planes``”h]”hŒm.planes”…”�”}”(hj•h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjÙubhŒ- array elements will be used instead and the ”…”�”}”(hjÙh²hh³Nh´Nubj—)�”}”(hŒ ``length``”h]”hŒlength”…”�”}”(hj§h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j–hjÙubhŒ field of struct ”…”�”}”(hjÙh²hh³Nh´Nubh)�”}”(hŒ:c:type:`v4l2_buffer`”h]”j—)�”}”(hj»h]”hŒ v4l2_buffer”…”�”}”(hj½h²hh³Nh´Nubah}”(h]”h ]”(jj‡Œc-type”eh"]”h$]”h&]”uh1j–hj¹ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”j‡Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jjj$Œ v4l2_buffer”uh1hh³hÇh´K6hjÙubhŒ– is set to the number of filled-in array elements. 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