src/clock/clock_internal.h

   1 /*****************************************************************************
   2  * clock_internal.h: Clock internal functions
   3  *****************************************************************************
   4  * Copyright (C) 2018 VLC authors and VideoLAN
   5  *
   6  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   7  *          Laurent Aimar < fenrir _AT_ videolan _DOT_ org >
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #include <vlc_common.h>
  25
  26 /*****************************************************************************
  27  * Structures
  28  *****************************************************************************/
  29
  30  /**
  31  * This structure holds long term average
  32  */
  33 typedef struct
  34 {
  35     vlc_tick_t i_value;
  36     int     i_residue;
  37
  38     int     i_count;
  39     int     i_divider;
  40 } average_t;
  41
  42 void    AvgInit( average_t *, int i_divider );
  43 void    AvgClean( average_t * );
  44
  45 void    AvgReset( average_t * );
  46 void    AvgUpdate( average_t *, vlc_tick_t i_value );
  47 vlc_tick_t AvgGet( average_t * );
  48 void    AvgRescale( average_t *, int i_divider );
  49
  50 /* */
  51 typedef struct
  52 {
  53     vlc_tick_t i_stream;
  54     vlc_tick_t i_system;
  55 } clock_point_t;
  56
  57 static inline clock_point_t clock_point_Create( vlc_tick_t i_stream, vlc_tick_t i_system )
  58 {
  59     clock_point_t p = { .i_stream = i_stream, .i_system = i_system };
  60     return p;
  61 }
  62