.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later .. c:namespace:: DTV.dmx

.. _DMX_GET_STC:

=========== DMX_GET_STC

Name

DMX_GET_STC

Synopsis

.. c:macro:: DMX_GET_STC

int ioctl(int fd, DMX_GET_STC, struct dmx_stc *stc)

Arguments

fd File descriptor returned by :c:func:open().

stc Pointer to :c:type:dmx_stc where the stc data is to be stored.

Description

This ioctl call returns the current value of the system time counter (which is driven by a PES filter of type :c:type:DMX_PES_PCR <dmx_ts_pes>). Some hardware supports more than one STC, so you must specify which one by setting the :c:type:num <dmx_stc> field of stc before the ioctl (range 0...n). The result is returned in form of a ratio with a 64 bit numerator and a 32 bit denominator, so the real 90kHz STC value is stc->stc / stc->base.

Return Value

On success 0 is returned.

On error -1 is returned, and the errno variable is set appropriately.

.. tabularcolumns:: |p{2.5cm}|p{15.0cm}|

.. flat-table:: :header-rows: 0 :stub-columns: 0 :widths: 1 16

-  .. row 1

   -  ``EINVAL``

   -  Invalid stc number.

The generic error codes are described at the :ref:Generic Error Codes <gen-errors> chapter.