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60c2820d0f
The name of the subsystem is "media", and not "linux_tv". Also, as we plan to add other stuff there in the future, let's rename also the media uAPI book to media_uapi, to make it clearer. No functional changes. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
77 lines
1.3 KiB
ReStructuredText
77 lines
1.3 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _DMX_GET_STC:
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===========
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DMX_GET_STC
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===========
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Name
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----
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DMX_GET_STC
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Synopsis
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--------
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.. cpp:function:: int ioctl( int fd, int request = DMX_GET_STC, struct dmx_stc *stc)
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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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- .. row 1
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- int fd
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- File descriptor returned by a previous call to open().
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- .. row 2
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- int request
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- Equals DMX_GET_STC for this command.
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- .. row 3
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- struct dmx_stc \*stc
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- Pointer to the location where the stc is to be stored.
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Description
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-----------
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This ioctl call returns the current value of the system time counter
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(which is driven by a PES filter of type DMX_PES_PCR). Some hardware
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supports more than one STC, so you must specify which one by setting the
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num field of stc before the ioctl (range 0...n). The result is returned
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in form of a ratio with a 64 bit numerator and a 32 bit denominator, so
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the real 90kHz STC value is stc->stc / stc->base .
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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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.. flat-table::
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:header-rows: 0
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- .. row 1
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- ``EINVAL``
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- Invalid stc number.
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