src/video_output/statistic.h

   1 /*****************************************************************************
   2  * statistic.h : vout statistic
   3  *****************************************************************************
   4  * Copyright (C) 2009 Laurent Aimar
   5  * $Id$
   6  *
   7  * Authors: 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 #ifndef LIBVLC_VOUT_STATISTIC_H
  25 # define LIBVLC_VOUT_STATISTIC_H
  26 # include <vlc_atomic.h>
  27
  28 /* NOTE: Both statistics are atomic on their own, so one might be older than
  29  * the other one. Currently, only one of them is updated at a time, so this
  30  * is a non-issue. */
  31 typedef struct {
  32     atomic_uint displayed;
  33     atomic_uint lost;
  34 } vout_statistic_t;
  35
  36 static inline void vout_statistic_Init(vout_statistic_t *stat)
  37 {
  38     atomic_init(&stat->displayed, 0);
  39     atomic_init(&stat->lost, 0);
  40 }
  41
  42 static inline void vout_statistic_Clean(vout_statistic_t *stat)
  43 {
  44     (void) stat;
  45 }
  46
  47 static inline void vout_statistic_GetReset(vout_statistic_t *stat, int *displayed, int *lost)
  48 {
  49     *displayed = atomic_exchange(&stat->displayed, 0);
  50     *lost      = atomic_exchange(&stat->lost, 0);
  51 }
  52
  53 static inline void vout_statistic_AddDisplayed(vout_statistic_t *stat,
  54                                                int displayed)
  55 {
  56     atomic_fetch_add(&stat->displayed, displayed);
  57 }
  58
  59 static inline void vout_statistic_AddLost(vout_statistic_t *stat, int lost)
  60 {
  61     atomic_fetch_add(&stat->lost, lost);
  62 }
  63
  64 #endif