€•UNŒsphinx.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]”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$]”h&]”Œ xml:space”Œpreserve”uh1h¡hhhžhhŸŒK/var/lib/git/docbuild/linux/Documentation/userspace-api/media/v4l/audio.rst”h KubhŒtarget”“”)”}”(hŒ .. _audio:”h]”h}”(h]”h ]”h"]”h$]”h&]”Œrefid”Œaudio”uh1h´h KhhhžhhŸh³ubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒAudio Inputs and Outputs”h]”hŒAudio Inputs and Outputs”…””}”(hhÉhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhhÄhžhhŸh³h KubhŒ paragraph”“”)”}”(hXáAudio inputs and outputs are physical connectors of a device. Video capture devices have inputs, output devices have outputs, zero or more each. Radio devices have no audio inputs or outputs. They have exactly one tuner which in fact *is* an audio source, but this API associates tuners with video inputs or outputs only, and radio devices have none of these. [#f1]_ A connector on a TV card to loop back the received audio signal to a sound card is not considered an audio output.”h]”(hŒêAudio inputs and outputs are physical connectors of a device. Video capture devices have inputs, output devices have outputs, zero or more each. Radio devices have no audio inputs or outputs. They have exactly one tuner which in fact ”…””}”(hhÙhžhhŸNh NubhŒemphasis”“”)”}”(hŒ*is*”h]”hŒis”…””}”(hhãhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1háhhÙubhŒz an audio source, but this API associates tuners with video inputs or outputs only, and radio devices have none of these. ”…””}”(hhÙhžhhŸNh NubhŒfootnote_reference”“”)”}”(hŒ[#f1]_”h]”hŒ1”…””}”(hh÷hžhhŸNh Nubah}”(h]”Œid1”ah ]”h"]”h$]”h&]”Œauto”KhÀŒf1”Œdocname”Œuserspace-api/media/v4l/audio”uh1hõhhÙŒresolved”KubhŒs A connector on a TV card to loop back the received audio signal to a sound card is not considered an audio output.”…””}”(hhÙhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh³h K hhÄhžhubhØ)”}”(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 ”…””}”(hjhžhhŸNh NubhŒliteral”“”)”}”(hŒ ``audioset``”h]”hŒaudioset”…””}”(hjhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjubhŒ field of the respective struct ”…””}”(hjhžhhŸNh Nubh)”}”(hŒ:c:type:`v4l2_input`”h]”j)”}”(hj3h]”hŒ v4l2_input”…””}”(hj5hžhhŸNh Nubah}”(h]”h ]”(Œxref”Œc”Œc-type”eh"]”h$]”h&]”uh1jhj1ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”j@Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰Œ reftarget”Œ v4l2_input”uh1hhŸh³h KhjubhŒ or struct ”…””}”(hjhžhhŸNh Nubh)”}”(hŒ:c:type:`v4l2_output`”h]”j)”}”(hjYh]”hŒ v4l2_output”…””}”(hj[hžhhŸNh Nubah}”(h]”h ]”(j?j@Œc-type”eh"]”h$]”h&]”uh1jhjWubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”j@Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jQŒ v4l2_output”uh1hhŸh³h KhjubhŒ], where each bit represents the index number, starting at zero, of one audio input or output.”…””}”(hjhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh³h KhhÄhžhubhØ)”}”(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€hžhhŸNh Nubh)”}”(hŒ:ref:`VIDIOC_ENUMAUDIO`”h]”hŒinline”“”)”}”(hjŠh]”hŒVIDIOC_ENUMAUDIO”…””}”(hjŽhžhhŸNh Nubah}”(h]”h ]”(j?Œstd”Œstd-ref”eh"]”h$]”h&]”uh1jŒhjˆubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”j˜Œreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆjQŒvidioc_enumaudio”uh1hhŸh³h Khj€ubhŒ and ”…””}”(hj€hžhhŸNh Nubh)”}”(hŒ,:ref:`VIDIOC_ENUMAUDOUT `”h]”j)”}”(hj°h]”hŒVIDIOC_ENUMAUDOUT”…””}”(hj²hžhhŸNh Nubah}”(h]”h ]”(j?Œstd”Œstd-ref”eh"]”h$]”h&]”uh1jŒhj®ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”j¼Œreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjQŒvidioc_enumaudout”uh1hhŸh³h Khj€ubhŒ! ioctl, respectively. The struct ”…””}”(hj€hžhhŸNh Nubh)”}”(hŒ:c:type:`v4l2_audio`”h]”j)”}”(hjÔh]”hŒ v4l2_audio”…””}”(hjÖhžhhŸNh Nubah}”(h]”h ]”(j?j@Œc-type”eh"]”h$]”h&]”uh1jhjÒubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”j@Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jQŒ v4l2_audio”uh1hhŸh³h Khj€ubhŒ returned by the ”…””}”(hj€hžhhŸNh Nubh)”}”(hŒ:ref:`VIDIOC_ENUMAUDIO`”h]”j)”}”(hj÷h]”hŒVIDIOC_ENUMAUDIO”…””}”(hjùhžhhŸNh Nubah}”(h]”h ]”(j?Œstd”Œstd-ref”eh"]”h$]”h&]”uh1jŒhjõubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jŒreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆjQŒvidioc_enumaudio”uh1hhŸh³h Khj€ubhŒb ioctl also contains signal status information applicable when the current audio input is queried.”…””}”(hj€hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh³h KhhÄhžhubhØ)”}”(hŒ—The :ref:`VIDIOC_G_AUDIO ` and :ref:`VIDIOC_G_AUDOUT ` ioctls report the current audio input and output, respectively.”h]”(hŒThe ”…””}”(hjhžhhŸNh Nubh)”}”(hŒ&:ref:`VIDIOC_G_AUDIO `”h]”j)”}”(hj)h]”hŒVIDIOC_G_AUDIO”…””}”(hj+hžhhŸNh Nubah}”(h]”h ]”(j?Œstd”Œstd-ref”eh"]”h$]”h&]”uh1jŒhj'ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”j5Œreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjQŒvidioc_g_audio”uh1hhŸh³h K$hjubhŒ and ”…””}”(hjhžhhŸNh Nubh)”}”(hŒ(:ref:`VIDIOC_G_AUDOUT `”h]”j)”}”(hjMh]”hŒVIDIOC_G_AUDOUT”…””}”(hjOhžhhŸNh Nubah}”(h]”h ]”(j?Œstd”Œstd-ref”eh"]”h$]”h&]”uh1jŒhjKubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jYŒreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjQŒvidioc_g_audout”uh1hhŸh³h K$hjubhŒ@ ioctls report the current audio input and output, respectively.”…””}”(hjhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh³h K$hhÄhžhubhŒnote”“”)”}”(hŒèNote that, unlike :ref:`VIDIOC_G_INPUT ` and :ref:`VIDIOC_G_OUTPUT ` these ioctls return a structure as :ref:`VIDIOC_ENUMAUDIO` and :ref:`VIDIOC_ENUMAUDOUT ` do, not just an index.”h]”hØ)”}”(hŒèNote that, unlike :ref:`VIDIOC_G_INPUT ` and :ref:`VIDIOC_G_OUTPUT ` these ioctls return a structure as :ref:`VIDIOC_ENUMAUDIO` and :ref:`VIDIOC_ENUMAUDOUT ` do, not just an index.”h]”(hŒNote that, unlike ”…””}”(hj{hžhhŸNh Nubh)”}”(hŒ&:ref:`VIDIOC_G_INPUT `”h]”j)”}”(hj…h]”hŒVIDIOC_G_INPUT”…””}”(hj‡hžhhŸNh Nubah}”(h]”h ]”(j?Œstd”Œstd-ref”eh"]”h$]”h&]”uh1jŒhjƒubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”j‘Œreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjQŒvidioc_g_input”uh1hhŸh³h K*hj{ubhŒ and ”…””}”(hj{hžhhŸNh Nubh)”}”(hŒ(:ref:`VIDIOC_G_OUTPUT `”h]”j)”}”(hj©h]”hŒVIDIOC_G_OUTPUT”…””}”(hj«hžhhŸNh Nubah}”(h]”h ]”(j?Œstd”Œstd-ref”eh"]”h$]”h&]”uh1jŒhj§ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jµŒreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjQŒvidioc_g_output”uh1hhŸh³h K*hj{ubhŒ$ these ioctls return a structure as ”…””}”(hj{hžhhŸNh Nubh)”}”(hŒ:ref:`VIDIOC_ENUMAUDIO`”h]”j)”}”(hjÍh]”hŒVIDIOC_ENUMAUDIO”…””}”(hjÏhžhhŸNh Nubah}”(h]”h ]”(j?Œstd”Œstd-ref”eh"]”h$]”h&]”uh1jŒhjËubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jÙŒreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆjQŒvidioc_enumaudio”uh1hhŸh³h K*hj{ubhŒ and ”…””}”hj{sbh)”}”(hŒ,:ref:`VIDIOC_ENUMAUDOUT `”h]”j)”}”(hjñh]”hŒVIDIOC_ENUMAUDOUT”…””}”(hjóhžhhŸNh Nubah}”(h]”h ]”(j?Œstd”Œstd-ref”eh"]”h$]”h&]”uh1jŒhjïubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jýŒreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjQŒvidioc_enumaudout”uh1hhŸh³h K*hj{ubhŒ do, not just an index.”…””}”(hj{hžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh³h K*hjwubah}”(h]”h ]”h"]”h$]”h&]”uh1juhhÄhžhhŸh³h NubhØ)”}”(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 ”…””}”(hjhžhhŸNh Nubh)”}”(hŒ&:ref:`VIDIOC_S_AUDIO `”h]”j)”}”(hj)h]”hŒVIDIOC_S_AUDIO”…””}”(hj+hžhhŸNh Nubah}”(h]”h ]”(j?Œstd”Œstd-ref”eh"]”h$]”h&]”uh1jŒhj'ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”j5Œreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjQŒvidioc_g_audio”uh1hhŸh³h K/hjubhŒg ioctl. To select an audio output (which presently has no changeable properties) applications call the ”…””}”(hjhžhhŸNh Nubh)”}”(hŒ(:ref:`VIDIOC_S_AUDOUT `”h]”j)”}”(hjMh]”hŒVIDIOC_S_AUDOUT”…””}”(hjOhžhhŸNh Nubah}”(h]”h ]”(j?Œstd”Œstd-ref”eh"]”h$]”h&]”uh1jŒhjKubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jYŒreftype”Œref”Œ refexplicit”ˆŒrefwarn”ˆjQŒvidioc_g_audout”uh1hhŸh³h K/hjubhŒ ioctl.”…””}”(hjhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh³h K/hhÄhžhubhØ)”}”(hXhDrivers must implement all audio input ioctls when the device has multiple selectable audio inputs, all audio output ioctls when the device has multiple selectable audio outputs. When the device has any audio inputs or outputs the driver must set the ``V4L2_CAP_AUDIO`` flag in the struct :c:type:`v4l2_capability` returned by the :ref:`VIDIOC_QUERYCAP` ioctl.”h]”(hŒûDrivers must implement all audio input ioctls when the device has multiple selectable audio inputs, all audio output ioctls when the device has multiple selectable audio outputs. When the device has any audio inputs or outputs the driver must set the ”…””}”(hjuhžhhŸNh Nubj)”}”(hŒ``V4L2_CAP_AUDIO``”h]”hŒV4L2_CAP_AUDIO”…””}”(hj}hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jhjuubhŒ flag in the struct ”…””}”(hjuhžhhŸNh Nubh)”}”(hŒ:c:type:`v4l2_capability`”h]”j)”}”(hj‘h]”hŒv4l2_capability”…””}”(hj“hžhhŸNh Nubah}”(h]”h ]”(j?j@Œc-type”eh"]”h$]”h&]”uh1jhjubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”j@Œreftype”Œtype”Œ refexplicit”‰Œrefwarn”‰jQŒv4l2_capability”uh1hhŸh³h K4hjuubhŒ returned by the ”…””}”(hjuhžhhŸNh Nubh)”}”(hŒ:ref:`VIDIOC_QUERYCAP`”h]”j)”}”(hj´h]”hŒVIDIOC_QUERYCAP”…””}”(hj¶hžhhŸNh Nubah}”(h]”h ]”(j?Œstd”Œstd-ref”eh"]”h$]”h&]”uh1jŒhj²ubah}”(h]”h ]”h"]”h$]”h&]”Œrefdoc”j Œ refdomain”jÀŒreftype”Œref”Œ refexplicit”‰Œrefwarn”ˆjQŒvidioc_querycap”uh1hhŸh³h K4hjuubhŒ ioctl.”…””}”(hjuhžhhŸNh Nubeh}”(h]”h ]”h"]”h$]”h&]”uh1h×hŸh³h K4hhÄhžhubhÃ)”}”(hhh]”(hÈ)”}”(hŒ2Example: Information about the current audio input”h]”hŒ2Example: Information about the current audio input”…””}”(hjßhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhjÜhžhhŸh³h 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);”…””}”hjïsbah}”(h]”h ]”h"]”h$]”h&]”h±h²Œforce”‰Œlanguage”j@Œhighlight_args”}”uh1jíhŸh³h K?hjÜhžhubeh}”(h]”Œ1example-information-about-the-current-audio-input”ah ]”h"]”Œ2example: information about the current audio input”ah$]”h&]”uh1hÂhhÄhžhhŸh³h K=ubhÃ)”}”(hhh]”(hÈ)”}”(hŒ+Example: Switching to the first audio input”h]”hŒ+Example: Switching to the first audio input”…””}”(hj hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÇhj hžhhŸh³h KNubjî)”}”(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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