€•îOŒsphinx.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/audio”Œmodname”NŒ classname”NŒ refexplicit”ˆuŒtagname”hhh ubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ1/translations/zh_TW/userspace-api/media/v4l/audio”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ1/translations/it_IT/userspace-api/media/v4l/audio”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ1/translations/ja_JP/userspace-api/media/v4l/audio”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ1/translations/ko_KR/userspace-api/media/v4l/audio”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒPortuguese (Brazilian)”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ1/translations/pt_BR/userspace-api/media/v4l/audio”Œmodname”NŒ classname”NŒ refexplicit”ˆuh1hhh ubh)”}”(hhh]”hŒSpanish”…””}”hh–sbah}”(h]”h ]”h"]”h$]”h&]”Œ refdomain”h)Œreftype”h+Œ reftarget”Œ1/translations/sp_SP/userspace-api/media/v4l/audio”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”uh1hµhhh²hh³ŒK/var/lib/git/docbuild/linux/Documentation/userspace-api/media/v4l/audio.rst”h´KubhŒtarget”“”)”}”(hŒ .. _audio:”h]”h}”(h]”h ]”h"]”h$]”h&]”Œrefid”Œaudio”uh1hÈh´Khhh²hh³hÇubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒAudio Inputs and Outputs”h]”hŒAudio Inputs and Outputs”…””}”(hhÝh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhhØh²hh³hÇh´KubhŒ paragraph”“”)”}”(hXáAudio inputs and outputs are physical connectors of a device. Video capture devices have inputs, output devices have outputs, zero or more each. Radio devices have no audio inputs or outputs. They have exactly one tuner which in fact *is* an audio source, but this API associates tuners with video inputs or outputs only, and radio devices have none of these. [#f1]_ A connector on a TV card to loop back the received audio signal to a sound card is not considered an audio output.”h]”(hŒêAudio inputs and outputs are physical connectors of a device. Video capture devices have inputs, output devices have outputs, zero or more each. Radio devices have no audio inputs or outputs. They have exactly one tuner which in fact ”…””}”(hhíh²hh³Nh´NubhŒemphasis”“”)”}”(hŒ*is*”h]”hŒis”…””}”(hh÷h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hõhhíubhŒz an audio source, but this API associates tuners with video inputs or outputs only, and radio devices have none of these. ”…””}”(hhíh²hh³Nh´NubhŒfootnote_reference”“”)”}”(hŒ[#f1]_”h]”hŒ1”…””}”(hj h²hh³Nh´Nubah}”(h]”Œid1”ah ]”h"]”h$]”h&]”Œauto”KhÔŒf1”Œdocname”Œuserspace-api/media/v4l/audio”uh1j hhíŒresolved”KubhŒs A connector on a TV card to loop back the received audio signal to a sound card is not considered an audio output.”…””}”(hhíh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÇh´K hhØh²hubhì)”}”(hX_Audio and video inputs and outputs are associated. Selecting a video source also selects an audio source. This is most evident when the video and audio source is a tuner. Further audio connectors can combine with more than one video input or output. Assumed two composite video inputs and two audio inputs exist, there may be up to four valid combinations. The relation of video and audio connectors is defined in the ``audioset`` field of the respective struct :c:type:`v4l2_input` or struct :c:type:`v4l2_output`, where each bit represents the index number, starting at zero, of one audio input or output.”h]”(hX¢Audio and video inputs and outputs are associated. Selecting a video source also selects an audio source. This is most evident when the video and audio source is a tuner. Further audio connectors can combine with more than one video input or output. Assumed two composite video inputs and two audio inputs exist, there may be up to four valid combinations. The relation of video and audio connectors is defined in the ”…””}”(hj)h²hh³Nh´NubhŒliteral”“”)”}”(hŒ ``audioset``”h]”hŒaudioset”…””}”(hj3h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j1hj)ubhŒ field of the respective struct ”…””}”(hj)h²hh³Nh´Nubh)”}”(hŒ:c:type:`v4l2_input`”h]”j2)”}”(hjGh]”hŒ v4l2_input”…””}”(hjIh²hh³Nh´Nubah}”(h]”h ]”(Œxref”Œc”Œc-type”eh"]”h$]”h&]”uh1j1hjEubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jTŒreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰Œ c:parent_key”Œsphinx.domains.c”Œ LookupKey”“”)”}”Œdata”]”jfŒ ASTIdentifier”“”)”}”Œ identifier”ŒV4L”sbN†”asbŒ reftarget”Œ v4l2_input”uh1hh³hÇh´Khj)ubhŒ or struct ”…””}”(hj)h²hh³Nh´Nubh)”}”(hŒ:c:type:`v4l2_output`”h]”j2)”}”(hj|h]”hŒ v4l2_output”…””}”(hj~h²hh³Nh´Nubah}”(h]”h ]”(jSjTŒc-type”eh"]”h$]”h&]”uh1j1hjzubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jTŒreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jejijtŒ v4l2_output”uh1hh³hÇh´Khj)ubhŒ], where each bit represents the index number, starting at zero, of one audio input or output.”…””}”(hj)h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÇh´KhhØh²hubhì)”}”(hX}To learn about the number and attributes of the available inputs and outputs applications can enumerate them with the :ref:`VIDIOC_ENUMAUDIO` and :ref:`VIDIOC_ENUMAUDOUT ` ioctl, respectively. The struct :c:type:`v4l2_audio` returned by the :ref:`VIDIOC_ENUMAUDIO` ioctl also contains signal status information applicable when the current audio input is queried.”h]”(hŒvTo learn about the number and attributes of the available inputs and outputs applications can enumerate them with the ”…””}”(hj£h²hh³Nh´Nubh)”}”(hŒ:ref:`VIDIOC_ENUMAUDIO`”h]”hŒinline”“”)”}”(hj­h]”hŒVIDIOC_ENUMAUDIO”…””}”(hj±h²hh³Nh´Nubah}”(h]”h ]”(jSŒstd”Œstd-ref”eh"]”h$]”h&]”uh1j¯hj«ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”j»Œreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆjtŒvidioc_enumaudio”uh1hh³hÇh´Khj£ubhŒ and ”…””}”(hj£h²hh³Nh´Nubh)”}”(hŒ,:ref:`VIDIOC_ENUMAUDOUT `”h]”j°)”}”(hjÓh]”hŒVIDIOC_ENUMAUDOUT”…””}”(hjÕh²hh³Nh´Nubah}”(h]”h ]”(jSŒstd”Œstd-ref”eh"]”h$]”h&]”uh1j¯hjÑubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jߌreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjtŒvidioc_enumaudout”uh1hh³hÇh´Khj£ubhŒ! ioctl, respectively. The struct ”…””}”(hj£h²hh³Nh´Nubh)”}”(hŒ:c:type:`v4l2_audio`”h]”j2)”}”(hj÷h]”hŒ v4l2_audio”…””}”(hjùh²hh³Nh´Nubah}”(h]”h ]”(jSjTŒc-type”eh"]”h$]”h&]”uh1j1hjõubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jTŒreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jejijtŒ v4l2_audio”uh1hh³hÇh´Khj£ubhŒ returned by the ”…””}”(hj£h²hh³Nh´Nubh)”}”(hŒ:ref:`VIDIOC_ENUMAUDIO`”h]”j°)”}”(hjh]”hŒVIDIOC_ENUMAUDIO”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”(jSŒstd”Œstd-ref”eh"]”h$]”h&]”uh1j¯hjubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”j&Œreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆjtŒvidioc_enumaudio”uh1hh³hÇh´Khj£ubhŒb ioctl also contains signal status information applicable when the current audio input is queried.”…””}”(hj£h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÇh´KhhØh²hubhì)”}”(hŒ—The :ref:`VIDIOC_G_AUDIO ` and :ref:`VIDIOC_G_AUDOUT ` ioctls report the current audio input and output, respectively.”h]”(hŒThe ”…””}”(hjBh²hh³Nh´Nubh)”}”(hŒ&:ref:`VIDIOC_G_AUDIO `”h]”j°)”}”(hjLh]”hŒVIDIOC_G_AUDIO”…””}”(hjNh²hh³Nh´Nubah}”(h]”h ]”(jSŒstd”Œstd-ref”eh"]”h$]”h&]”uh1j¯hjJubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jXŒreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjtŒvidioc_g_audio”uh1hh³hÇh´K%hjBubhŒ and ”…””}”(hjBh²hh³Nh´Nubh)”}”(hŒ(:ref:`VIDIOC_G_AUDOUT `”h]”j°)”}”(hjph]”hŒVIDIOC_G_AUDOUT”…””}”(hjrh²hh³Nh´Nubah}”(h]”h ]”(jSŒstd”Œstd-ref”eh"]”h$]”h&]”uh1j¯hjnubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”j|Œreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjtŒvidioc_g_audout”uh1hh³hÇh´K%hjBubhŒ@ ioctls report the current audio input and output, respectively.”…””}”(hjBh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÇh´K%hhØh²hubhŒnote”“”)”}”(hŒèNote that, unlike :ref:`VIDIOC_G_INPUT ` and :ref:`VIDIOC_G_OUTPUT ` these ioctls return a structure as :ref:`VIDIOC_ENUMAUDIO` and :ref:`VIDIOC_ENUMAUDOUT ` do, not just an index.”h]”hì)”}”(hŒèNote that, unlike :ref:`VIDIOC_G_INPUT ` and :ref:`VIDIOC_G_OUTPUT ` these ioctls return a structure as :ref:`VIDIOC_ENUMAUDIO` and :ref:`VIDIOC_ENUMAUDOUT ` do, not just an index.”h]”(hŒNote that, unlike ”…””}”(hjžh²hh³Nh´Nubh)”}”(hŒ&:ref:`VIDIOC_G_INPUT `”h]”j°)”}”(hj¨h]”hŒVIDIOC_G_INPUT”…””}”(hjªh²hh³Nh´Nubah}”(h]”h ]”(jSŒstd”Œstd-ref”eh"]”h$]”h&]”uh1j¯hj¦ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”j´Œreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjtŒvidioc_g_input”uh1hh³hÇh´K+hjžubhŒ and ”…””}”(hjžh²hh³Nh´Nubh)”}”(hŒ(:ref:`VIDIOC_G_OUTPUT `”h]”j°)”}”(hjÌh]”hŒVIDIOC_G_OUTPUT”…””}”(hjÎh²hh³Nh´Nubah}”(h]”h ]”(jSŒstd”Œstd-ref”eh"]”h$]”h&]”uh1j¯hjÊubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jØŒreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjtŒvidioc_g_output”uh1hh³hÇh´K+hjžubhŒ$ these ioctls return a structure as ”…””}”(hjžh²hh³Nh´Nubh)”}”(hŒ:ref:`VIDIOC_ENUMAUDIO`”h]”j°)”}”(hjðh]”hŒVIDIOC_ENUMAUDIO”…””}”(hjòh²hh³Nh´Nubah}”(h]”h ]”(jSŒstd”Œstd-ref”eh"]”h$]”h&]”uh1j¯hjîubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jüŒreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆjtŒvidioc_enumaudio”uh1hh³hÇh´K+hjžubhŒ and ”…””}”hjžsbh)”}”(hŒ,:ref:`VIDIOC_ENUMAUDOUT `”h]”j°)”}”(hjh]”hŒVIDIOC_ENUMAUDOUT”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”(jSŒstd”Œstd-ref”eh"]”h$]”h&]”uh1j¯hjubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”j Œreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjtŒvidioc_enumaudout”uh1hh³hÇh´K+hjžubhŒ do, not just an index.”…””}”(hjžh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÇh´K+hjšubah}”(h]”h ]”h"]”h$]”h&]”uh1j˜hhØh²hh³hÇh´Nubhì)”}”(hXTo select an audio input and change its properties applications call the :ref:`VIDIOC_S_AUDIO ` ioctl. To select an audio output (which presently has no changeable properties) applications call the :ref:`VIDIOC_S_AUDOUT ` ioctl.”h]”(hŒITo select an audio input and change its properties applications call the ”…””}”(hjBh²hh³Nh´Nubh)”}”(hŒ&:ref:`VIDIOC_S_AUDIO `”h]”j°)”}”(hjLh]”hŒVIDIOC_S_AUDIO”…””}”(hjNh²hh³Nh´Nubah}”(h]”h ]”(jSŒstd”Œstd-ref”eh"]”h$]”h&]”uh1j¯hjJubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jXŒreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjtŒvidioc_g_audio”uh1hh³hÇh´K0hjBubhŒg ioctl. To select an audio output (which presently has no changeable properties) applications call the ”…””}”(hjBh²hh³Nh´Nubh)”}”(hŒ(:ref:`VIDIOC_S_AUDOUT `”h]”j°)”}”(hjph]”hŒVIDIOC_S_AUDOUT”…””}”(hjrh²hh³Nh´Nubah}”(h]”h ]”(jSŒstd”Œstd-ref”eh"]”h$]”h&]”uh1j¯hjnubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”j|Œreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjtŒvidioc_g_audout”uh1hh³hÇh´K0hjBubhŒ ioctl.”…””}”(hjBh²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÇh´K0hhØh²hubhì)”}”(hXhDrivers must implement all audio input ioctls when the device has multiple selectable audio inputs, all audio output ioctls when the device has multiple selectable audio outputs. When the device has any audio inputs or outputs the driver must set the ``V4L2_CAP_AUDIO`` flag in the struct :c:type:`v4l2_capability` returned by the :ref:`VIDIOC_QUERYCAP` ioctl.”h]”(hŒûDrivers must implement all audio input ioctls when the device has multiple selectable audio inputs, all audio output ioctls when the device has multiple selectable audio outputs. When the device has any audio inputs or outputs the driver must set the ”…””}”(hj˜h²hh³Nh´Nubj2)”}”(hŒ``V4L2_CAP_AUDIO``”h]”hŒV4L2_CAP_AUDIO”…””}”(hj h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1j1hj˜ubhŒ flag in the struct ”…””}”(hj˜h²hh³Nh´Nubh)”}”(hŒ:c:type:`v4l2_capability`”h]”j2)”}”(hj´h]”hŒv4l2_capability”…””}”(hj¶h²hh³Nh´Nubah}”(h]”h ]”(jSjTŒc-type”eh"]”h$]”h&]”uh1j1hj²ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jTŒreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jejijtŒv4l2_capability”uh1hh³hÇh´K5hj˜ubhŒ returned by the ”…””}”(hj˜h²hh³Nh´Nubh)”}”(hŒ:ref:`VIDIOC_QUERYCAP`”h]”j°)”}”(hj×h]”hŒVIDIOC_QUERYCAP”…””}”(hjÙh²hh³Nh´Nubah}”(h]”h ]”(jSŒstd”Œstd-ref”eh"]”h$]”h&]”uh1j¯hjÕubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”jŒ refdomain”jãŒreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆjtŒvidioc_querycap”uh1hh³hÇh´K5hj˜ubhŒ ioctl.”…””}”(hj˜h²hh³Nh´Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÇh´K5hhØh²hubh×)”}”(hhh]”(hÜ)”}”(hŒ2Example: Information about the current audio input”h]”hŒ2Example: Information about the current audio input”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhjÿh²hh³hÇh´K>ubhŒ literal_block”“”)”}”(hŒÐstruct v4l2_audio audio; memset(&audio, 0, sizeof(audio)); if (-1 == ioctl(fd, VIDIOC_G_AUDIO, &audio)) { perror("VIDIOC_G_AUDIO"); exit(EXIT_FAILURE); } printf("Current input: %s\\n", audio.name);”h]”hŒÐstruct v4l2_audio audio; memset(&audio, 0, sizeof(audio)); if (-1 == ioctl(fd, VIDIOC_G_AUDIO, &audio)) { perror("VIDIOC_G_AUDIO"); exit(EXIT_FAILURE); } printf("Current input: %s\\n", audio.name);”…””}”hjsbah}”(h]”h ]”h"]”h$]”h&]”hÅhÆŒforce”‰Œlanguage”jTŒhighlight_args”}”uh1jh³hÇh´K@hjÿh²hubeh}”(h]”Œ1example-information-about-the-current-audio-input”ah ]”h"]”Œ2example: information about the current audio input”ah$]”h&]”uh1hÖhhØh²hh³hÇh´K>ubh×)”}”(hhh]”(hÜ)”}”(hŒ+Example: Switching to the first audio input”h]”hŒ+Example: Switching to the first audio input”…””}”(hj/h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÛhj,h²hh³hÇh´KOubj)”}”(hŒÜstruct v4l2_audio audio; memset(&audio, 0, sizeof(audio)); /* clear audio.mode, audio.reserved */ audio.index = 0; if (-1 == ioctl(fd, VIDIOC_S_AUDIO, &audio)) { perror("VIDIOC_S_AUDIO"); 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