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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_ARM
42 # include "arm/timer.h"
43 #elif ARCH_PPC
44 # include "ppc/timer.h"
45 #elif ARCH_X86
46 # include "x86/timer.h"
47 #endif
48 
49 #if !defined(AV_READ_TIME)
50 # if HAVE_GETHRTIME
51 # define AV_READ_TIME gethrtime
52 # elif HAVE_MACH_ABSOLUTE_TIME
53 # define AV_READ_TIME mach_absolute_time
54 # endif
55 #endif
56 
57 #ifndef FF_TIMER_UNITS
58 # define FF_TIMER_UNITS "UNITS"
59 #endif
60 
61 #ifdef AV_READ_TIME
62 #define START_TIMER \
63  uint64_t tend; \
64  uint64_t tstart = AV_READ_TIME(); \
65 
66 #define STOP_TIMER(id) \
67  tend = AV_READ_TIME(); \
68  { \
69  static uint64_t tsum = 0; \
70  static int tcount = 0; \
71  static int tskip_count = 0; \
72  static int thistogram[32] = {0}; \
73  thistogram[av_log2(tend - tstart)]++; \
74  if (tcount < 2 || \
75  tend - tstart < 8 * tsum / tcount || \
76  tend - tstart < 2000) { \
77  tsum+= tend - tstart; \
78  tcount++; \
79  } else \
80  tskip_count++; \
81  if (((tcount + tskip_count) & (tcount + tskip_count - 1)) == 0) { \
82  int i; \
83  av_log(NULL, AV_LOG_ERROR, \
84  "%7"PRIu64" " FF_TIMER_UNITS " in %s,%8d runs,%7d skips", \
85  tsum * 10 / tcount, id, tcount, tskip_count); \
86  for (i = 0; i < 32; i++) \
87  av_log(NULL, AV_LOG_VERBOSE, " %2d", av_log2(2*thistogram[i]));\
88  av_log(NULL, AV_LOG_ERROR, "\n"); \
89  } \
90  }
91 #else
92 #define START_TIMER
93 #define STOP_TIMER(id) { }
94 #endif
95 
96 #endif /* AVUTIL_TIMER_H */