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64 lines
1.3 KiB
64 lines
1.3 KiB
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later |
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.. c:namespace:: DTV.dmx |
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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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.. c:macro:: DMX_GET_STC |
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``int ioctl(int fd, DMX_GET_STC, struct dmx_stc *stc)`` |
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Arguments |
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--------- |
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``fd`` |
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File descriptor returned by :c:func:`open()`. |
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``stc`` |
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Pointer to :c:type:`dmx_stc` where the stc data 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 :c:type:`DMX_PES_PCR <dmx_ts_pes>`). |
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Some hardware supports more than one STC, so you must specify which one by |
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setting the :c:type:`num <dmx_stc>` field of stc before the ioctl (range 0...n). |
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The result is returned in form of a ratio with a 64 bit numerator |
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and a 32 bit denominator, so the real 90kHz STC value is |
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``stc->stc / stc->base``. |
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Return Value |
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------------ |
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On success 0 is returned. |
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On error -1 is returned, and the ``errno`` variable is set |
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appropriately. |
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.. tabularcolumns:: |p{2.5cm}|p{15.0cm}| |
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.. flat-table:: |
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:header-rows: 0 |
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:stub-columns: 0 |
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:widths: 1 16 |
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- .. row 1 |
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- ``EINVAL`` |
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- Invalid stc number. |
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The generic error codes are described at the |
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:ref:`Generic Error Codes <gen-errors>` chapter.
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