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Linux kernel mirror (for testing)
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kernel
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linux
media: dmx-get-pes-pids.rst: document the ioctl
This ioctl is supported by the DVB core, but was never
documented.
Add a documentation for it.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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Documentation/media/uapi/dvb/dmx-get-pes-pids.rst
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Documentation/media/uapi/dvb/dmx-get-pes-pids.rst
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File descriptor returned by :c:func:`open() <dvb-dmx-open>`.
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``pids``
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Undocumented.
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Array used to store 5 Program IDs.
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Description
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-----------
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.. note:: This ioctl is undocumented. Documentation is welcome.
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This ioctl allows to query a DVB device to return the first PID used
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by audio, video, textext, subtitle and PCR programs on a given service.
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They're stored as:
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======================= ======== =======================================
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PID element position content
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======================= ======== =======================================
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pids[DMX_PES_AUDIO] 0 first audio PID
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pids[DMX_PES_VIDEO] 1 first video PID
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pids[DMX_PES_TELETEXT] 2 first teletext PID
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pids[DMX_PES_SUBTITLE] 3 first subtitle PID
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pids[DMX_PES_PCR] 4 first Program Clock Reference PID
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======================= ======== =======================================
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.. note::
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A value equal to 0xffff means that the PID was not filled by the
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Kernel.
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Return Value