timer: use mach_absolute_time as high resolution clock on darwin
[libav.git] / libavutil / timer.h
1 /*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of Libav.
5 *
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * high precision timer, useful to profile code
24 */
25
26 #ifndef AVUTIL_TIMER_H
27 #define AVUTIL_TIMER_H
28
29 #include <stdlib.h>
30 #include <stdint.h>
31 #include <inttypes.h>
32
33 #include "config.h"
34
35 #if HAVE_MACH_MACH_TIME_H
36 #include <mach/mach_time.h>
37 #endif
38
39 #include "log.h"
40
41 #if ARCH_ARM
42 # include "arm/timer.h"
43 #elif ARCH_BFIN
44 # include "bfin/timer.h"
45 #elif ARCH_PPC
46 # include "ppc/timer.h"
47 #elif ARCH_X86
48 # include "x86/timer.h"
49 #endif
50
51 #if !defined(AV_READ_TIME)
52 # if HAVE_GETHRTIME
53 # define AV_READ_TIME gethrtime
54 # elif HAVE_MACH_ABSOLUTE_TIME
55 # define AV_READ_TIME mach_absolute_time
56 # endif
57 #endif
58
59 #ifdef AV_READ_TIME
60 #define START_TIMER \
61 uint64_t tend; \
62 uint64_t tstart = AV_READ_TIME(); \
63
64 #define STOP_TIMER(id) \
65 tend = AV_READ_TIME(); \
66 { \
67 static uint64_t tsum = 0; \
68 static int tcount = 0; \
69 static int tskip_count = 0; \
70 if (tcount < 2 || \
71 tend - tstart < 8 * tsum / tcount || \
72 tend - tstart < 2000) { \
73 tsum+= tend - tstart; \
74 tcount++; \
75 } else \
76 tskip_count++; \
77 if (((tcount + tskip_count) & (tcount + tskip_count - 1)) == 0) { \
78 av_log(NULL, AV_LOG_ERROR, \
79 "%"PRIu64" UNITS in %s, %d runs, %d skips\n", \
80 tsum * 10 / tcount, id, tcount, tskip_count); \
81 } \
82 }
83 #else
84 #define START_TIMER
85 #define STOP_TIMER(id) { }
86 #endif
87
88 #endif /* AVUTIL_TIMER_H */