€•¼.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”Œ1/translations/zh_CN/userspace-api/media/v4l/video”Œmodname”NŒ classname”NŒ refexplicit”ˆuŒtagname”hhh ubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ1/translations/zh_TW/userspace-api/media/v4l/video”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ1/translations/it_IT/userspace-api/media/v4l/video”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ1/translations/ja_JP/userspace-api/media/v4l/video”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ1/translations/ko_KR/userspace-api/media/v4l/video”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ1/translations/sp_SP/userspace-api/media/v4l/video”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubeh}”(h]”h ]”h"]”h$]”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$]”h&]”Œ xml:space”Œpreserve”uh1h¡hhhžhhŸŒK/var/lib/git/docbuild/linux/Documentation/userspace-api/media/v4l/video.rst”h KubhŒtarget”“”)”}”(hŒ .. _video:”h]”h}”(h]”h ]”h"]”h$]”h&]”Œrefid”Œvideo”uh1h´h KhhhžhhŸh³ubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒVideo Inputs and Outputs”h]”hŒVideo Inputs and Outputs”…””}”(hhÉhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhhÄhžhhŸh³h KubhŒ paragraph”“”)”}”(hXVideo inputs and outputs are physical connectors of a device. These can be for example: RF connectors (antenna/cable), CVBS a.k.a. Composite Video, S-Video and RGB connectors. Camera sensors are also considered to be a video input. Video and VBI capture devices have inputs. Video and VBI output devices have outputs, at least one each. Radio devices have no video inputs or outputs.”h]”hXVideo inputs and outputs are physical connectors of a device. These can be for example: RF connectors (antenna/cable), CVBS a.k.a. Composite Video, S-Video and RGB connectors. Camera sensors are also considered to be a video input. Video and VBI capture devices have inputs. Video and VBI output devices have outputs, at least one each. Radio devices have no video inputs or outputs.”…””}”(hhÙhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh³h K hhÄhžhubhØ)”}”(hXiTo learn about the number and attributes of the available inputs and outputs applications can enumerate them with the :ref:`VIDIOC_ENUMINPUT` and :ref:`VIDIOC_ENUMOUTPUT` ioctl, respectively. The struct :c:type:`v4l2_input` returned by the :ref:`VIDIOC_ENUMINPUT` ioctl also contains signal status information applicable when the current video input is queried.”h]”(hŒvTo learn about the number and attributes of the available inputs and outputs applications can enumerate them with the ”…””}”(hhçhžhhŸNh Nubh)”}”(hŒ:ref:`VIDIOC_ENUMINPUT`”h]”hŒinline”“”)”}”(hhñh]”hŒVIDIOC_ENUMINPUT”…””}”(hhõhžhhŸNh Nubah}”(h]”h ]”(Œxref”Œstd”Œstd-ref”eh"]”h$]”h&]”uh1hóhhïubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”Œuserspace-api/media/v4l/video”Œ refdomain”jŒreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆŒ reftarget”Œvidioc_enuminput”uh1hhŸh³h KhhçubhŒ and ”…””}”(hhçhžhhŸNh Nubh)”}”(hŒ:ref:`VIDIOC_ENUMOUTPUT`”h]”hô)”}”(hjh]”hŒVIDIOC_ENUMOUTPUT”…””}”(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”‰Œrefwarn”ˆjŒvidioc_enumoutput”uh1hhŸh³h KhhçubhŒ! ioctl, respectively. The struct ”…””}”(hhçhžhhŸNh Nubh)”}”(hŒ:c:type:`v4l2_input`”h]”hŒliteral”“”)”}”(hj>h]”hŒ v4l2_input”…””}”(hjBhžhhŸNh Nubah}”(h]”h ]”(hÿŒc”Œc-type”eh"]”h$]”h&]”uh1j@hj<ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jLŒreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰Œ c:parent_key”Œsphinx.domains.c”Œ LookupKey”“”)”}”Œdata”]”j^Œ ASTIdentifier”“”)”}”Œ identifier”ŒV4L”sbN†”asbjŒ v4l2_input”uh1hhŸh³h KhhçubhŒ returned by the ”…””}”(hhçhžhhŸNh Nubh)”}”(hŒ:ref:`VIDIOC_ENUMINPUT`”h]”hô)”}”(hjsh]”hŒVIDIOC_ENUMINPUT”…””}”(hjuhžhhŸNh Nubah}”(h]”h ]”(hÿŒstd”Œstd-ref”eh"]”h$]”h&]”uh1hóhjqubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jŒreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆjŒvidioc_enuminput”uh1hhŸh³h KhhçubhŒb ioctl also contains signal status information applicable when the current video input is queried.”…””}”(hhçhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh³h KhhÄhžhubhØ)”}”(hXÀThe :ref:`VIDIOC_G_INPUT ` and :ref:`VIDIOC_G_OUTPUT ` ioctls return the index of the current video input or output. To select a different input or output applications call the :ref:`VIDIOC_S_INPUT ` and :ref:`VIDIOC_S_OUTPUT ` ioctls. Drivers must implement all the input ioctls when the device has one or more inputs, all the output ioctls when the device has one or more outputs.”h]”(hŒThe ”…””}”(hj›hžhhŸNh Nubh)”}”(hŒ&:ref:`VIDIOC_G_INPUT `”h]”hô)”}”(hj¥h]”hŒVIDIOC_G_INPUT”…””}”(hj§hžhhŸNh Nubah}”(h]”h ]”(hÿŒstd”Œstd-ref”eh"]”h$]”h&]”uh1hóhj£ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”j±Œreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjŒvidioc_g_input”uh1hhŸh³h Khj›ubhŒ and ”…””}”(hj›hžhhŸNh Nubh)”}”(hŒ(:ref:`VIDIOC_G_OUTPUT `”h]”hô)”}”(hjÉh]”hŒVIDIOC_G_OUTPUT”…””}”(hjËhžhhŸNh Nubah}”(h]”h ]”(hÿŒstd”Œstd-ref”eh"]”h$]”h&]”uh1hóhjÇubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jÕŒreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjŒvidioc_g_output”uh1hhŸh³h Khj›ubhŒ{ ioctls return the index of the current video input or output. To select a different input or output applications call the ”…””}”(hj›hžhhŸNh Nubh)”}”(hŒ&:ref:`VIDIOC_S_INPUT `”h]”hô)”}”(hjíh]”hŒVIDIOC_S_INPUT”…””}”(hjïhžhhŸNh Nubah}”(h]”h ]”(hÿŒstd”Œstd-ref”eh"]”h$]”h&]”uh1hóhjëubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jùŒreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjŒvidioc_g_input”uh1hhŸh³h Khj›ubhŒ and ”…””}”hj›sbh)”}”(hŒ(:ref:`VIDIOC_S_OUTPUT `”h]”hô)”}”(hjh]”hŒVIDIOC_S_OUTPUT”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”(hÿŒstd”Œstd-ref”eh"]”h$]”h&]”uh1hóhjubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jŒreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjŒvidioc_g_output”uh1hhŸh³h Khj›ubhŒ› ioctls. Drivers must implement all the input ioctls when the device has one or more inputs, all the output ioctls when the device has one or more outputs.”…””}”(hj›hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh³h KhhÄhžhubhÃ)”}”(hhh]”(hÈ)”}”(hŒ2Example: Information about the current video input”h]”hŒ2Example: Information about the current video input”…””}”(hj<hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhj9hžhhŸh³h K"ubhŒ literal_block”“”)”}”(hX\struct v4l2_input input; int index; if (-1 == ioctl(fd, VIDIOC_G_INPUT, &index)) { perror("VIDIOC_G_INPUT"); exit(EXIT_FAILURE); } memset(&input, 0, sizeof(input)); input.index = index; if (-1 == ioctl(fd, VIDIOC_ENUMINPUT, &input)) { perror("VIDIOC_ENUMINPUT"); exit(EXIT_FAILURE); } printf("Current input: %s\\n", input.name);”h]”hX\struct v4l2_input input; int index; if (-1 == ioctl(fd, VIDIOC_G_INPUT, &index)) { perror("VIDIOC_G_INPUT"); exit(EXIT_FAILURE); } memset(&input, 0, sizeof(input)); input.index = index; if (-1 == ioctl(fd, VIDIOC_ENUMINPUT, &input)) { perror("VIDIOC_ENUMINPUT"); exit(EXIT_FAILURE); } printf("Current input: %s\\n", input.name);”…””}”hjLsbah}”(h]”h ]”h"]”h$]”h&]”h±h²Œforce”‰Œlanguage”jLŒhighlight_args”}”uh1jJhŸh³h K$hj9hžhubeh}”(h]”Œ1example-information-about-the-current-video-input”ah ]”h"]”Œ2example: information about the current video input”ah$]”h&]”uh1hÂhhÄhžhhŸh³h K"ubhÃ)”}”(hhh]”(hÈ)”}”(hŒ+Example: Switching to the first video input”h]”hŒ+Example: Switching to the first video input”…””}”(hjihžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhjfhžhhŸh³h K:ubjK)”}”(hŒ~int index; index = 0; if (-1 == ioctl(fd, VIDIOC_S_INPUT, &index)) { perror("VIDIOC_S_INPUT"); exit(EXIT_FAILURE); }”h]”hŒ~int index; index = 0; if (-1 == ioctl(fd, VIDIOC_S_INPUT, &index)) { perror("VIDIOC_S_INPUT"); exit(EXIT_FAILURE); }”…””}”hjwsbah}”(h]”h ]”h"]”h$]”h&]”h±h²jZ‰j[jLj\}”uh1jJhŸh³h K