| .. -*- coding: utf-8; mode: rst -*- |
| |
| .. _DMX_GET_STC: |
| |
| =========== |
| DMX_GET_STC |
| =========== |
| |
| NAME |
| ---- |
| |
| DMX_GET_STC |
| |
| SYNOPSIS |
| -------- |
| |
| .. c:function:: int ioctl( int fd, int request = DMX_GET_STC, struct dmx_stc *stc) |
| |
| |
| ARGUMENTS |
| --------- |
| |
| .. flat-table:: |
| :header-rows: 0 |
| :stub-columns: 0 |
| |
| |
| - .. row 1 |
| |
| - int fd |
| |
| - File descriptor returned by a previous call to open(). |
| |
| - .. row 2 |
| |
| - int request |
| |
| - Equals DMX_GET_STC for this command. |
| |
| - .. row 3 |
| |
| - struct dmx_stc \*stc |
| |
| - Pointer to the location where the stc 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 DMX_PES_PCR). Some hardware |
| supports more than one STC, so you must specify which one by setting the |
| num 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 and the ``errno`` variable is set |
| appropriately. The generic error codes are described at the |
| :ref:`Generic Error Codes <gen-errors>` chapter. |
| |
| |
| |
| .. flat-table:: |
| :header-rows: 0 |
| :stub-columns: 0 |
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| |
| - .. row 1 |
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| - ``EINVAL`` |
| |
| - Invalid stc number. |