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54f38fcae5
Since 2017, there is an space reserved for userspace API,
created by changeset 1d596dee38 ("docs: Create a user-space API guide").
As the media subsystem was one of the first subsystems to use
Sphinx, until this patch, we were keeping things on a separate
place.
Let's just use the new location, as having all uAPI altogether
will likely make things easier for developers.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
68 lines
1.5 KiB
ReStructuredText
68 lines
1.5 KiB
ReStructuredText
.. Permission is granted to copy, distribute and/or modify this
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.. document under the terms of the GNU Free Documentation License,
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.. Version 1.1 or any later version published by the Free Software
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.. Foundation, with no Invariant Sections, no Front-Cover Texts
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.. and no Back-Cover Texts. A copy of the license is included at
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.. Documentation/userspace-api/media/fdl-appendix.rst.
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..
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.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
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.. _AUDIO_SET_ID:
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============
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AUDIO_SET_ID
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============
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Name
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----
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AUDIO_SET_ID
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.. attention:: This ioctl is deprecated
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Synopsis
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--------
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.. c:function:: int ioctl(int fd, AUDIO_SET_ID, int id)
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:name: AUDIO_SET_ID
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Arguments
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---------
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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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-
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- int fd
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- File descriptor returned by a previous call to open().
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-
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- int id
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- audio sub-stream id
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Description
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-----------
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This ioctl selects which sub-stream is to be decoded if a program or
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system stream is sent to the video device. If no audio stream type is
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set the id has to be in [0xC0,0xDF] for MPEG sound, in [0x80,0x87] for
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AC3 and in [0xA0,0xA7] for LPCM. More specifications may follow for
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other stream types. If the stream type is set the id just specifies the
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substream id of the audio stream and only the first 5 bits are
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recognized.
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Return Value
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------------
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On success 0 is returned, on error -1 and the ``errno`` variable is set
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appropriately. The generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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