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timer.h
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1 /*
2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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_AARCH64
42 # include "aarch64/timer.h"
43 #elif ARCH_ARM
44 # include "arm/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 #ifndef FF_TIMER_UNITS
60 # define FF_TIMER_UNITS "UNITS"
61 #endif
62 
63 #ifdef AV_READ_TIME
64 #define START_TIMER \
65  uint64_t tend; \
66  uint64_t tstart = AV_READ_TIME(); \
67 
68 #define STOP_TIMER(id) \
69  tend = AV_READ_TIME(); \
70  { \
71  static uint64_t tsum = 0; \
72  static int tcount = 0; \
73  static int tskip_count = 0; \
74  static int thistogram[32] = {0}; \
75  thistogram[av_log2(tend - tstart)]++; \
76  if (tcount < 2 || \
77  tend - tstart < 8 * tsum / tcount || \
78  tend - tstart < 2000) { \
79  tsum+= tend - tstart; \
80  tcount++; \
81  } else \
82  tskip_count++; \
83  if (((tcount + tskip_count) & (tcount + tskip_count - 1)) == 0) { \
84  int i; \
85  av_log(NULL, AV_LOG_ERROR, \
86  "%7"PRIu64" " FF_TIMER_UNITS " in %s,%8d runs,%7d skips", \
87  tsum * 10 / tcount, id, tcount, tskip_count); \
88  for (i = 0; i < 32; i++) \
89  av_log(NULL, AV_LOG_VERBOSE, " %2d", av_log2(2*thistogram[i]));\
90  av_log(NULL, AV_LOG_ERROR, "\n"); \
91  } \
92  }
93 #else
94 #define START_TIMER
95 #define STOP_TIMER(id) { }
96 #endif
97 
98 #endif /* AVUTIL_TIMER_H */