1 /*****************************************************************************
2 * chrono.h: vout chrono
3 *****************************************************************************
4 * Copyright (C) 2009-2010 Laurent Aimar
7 * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
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.
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.
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 *****************************************************************************/
24 #ifndef LIBVLC_VOUT_CHRONO_H
25 #define LIBVLC_VOUT_CHRONO_H
32 vlc_tick_t avg_initial
;
40 static inline void vout_chrono_Init(vout_chrono_t
*chrono
, int shift
, vlc_tick_t avg_initial
)
42 chrono
->shift
= shift
;
44 chrono
->avg
= avg_initial
;
46 chrono
->shift_var
= shift
+1;
47 chrono
->var
= avg_initial
/ 2;
49 chrono
->start
= VLC_TICK_INVALID
;
51 static inline void vout_chrono_Clean(vout_chrono_t
*chrono
)
55 static inline void vout_chrono_Start(vout_chrono_t
*chrono
)
57 chrono
->start
= vlc_tick_now();
59 static inline vlc_tick_t
vout_chrono_GetHigh(vout_chrono_t
*chrono
)
61 return chrono
->avg
+ 2 * chrono
->var
;
63 static inline vlc_tick_t
vout_chrono_GetLow(vout_chrono_t
*chrono
)
65 return __MAX(chrono
->avg
- 2 * chrono
->var
, 0);
68 static inline void vout_chrono_Stop(vout_chrono_t
*chrono
)
70 assert(chrono
->start
!= VLC_TICK_INVALID
);
73 const vlc_tick_t duration
= vlc_tick_now() - chrono
->start
;
74 const vlc_tick_t var
= llabs( duration
- chrono
->avg
);
76 /* Update average only if the current point is 'valid' */
77 if( duration
< vout_chrono_GetHigh( chrono
) )
78 chrono
->avg
= (((1 << chrono
->shift
) - 1) * chrono
->avg
+ duration
) >> chrono
->shift
;
79 /* Always update the variance */
80 chrono
->var
= (((1 << chrono
->shift_var
) - 1) * chrono
->var
+ var
) >> chrono
->shift_var
;
83 chrono
->start
= VLC_TICK_INVALID
;
85 static inline void vout_chrono_Reset(vout_chrono_t
*chrono
)
87 vout_chrono_t ch
= *chrono
;
88 vout_chrono_Clean(chrono
);
89 vout_chrono_Init(chrono
, ch
.shift
, ch
.avg_initial
);