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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 #include "log.h"
36 
37 #if ARCH_ARM
38 # include "arm/timer.h"
39 #elif ARCH_BFIN
40 # include "bfin/timer.h"
41 #elif ARCH_PPC
42 # include "ppc/timer.h"
43 #elif ARCH_X86
44 # include "x86/timer.h"
45 #endif
46 
47 #if !defined(AV_READ_TIME) && HAVE_GETHRTIME
48 # define AV_READ_TIME gethrtime
49 #endif
50 
51 #ifdef AV_READ_TIME
52 #define START_TIMER \
53  uint64_t tend; \
54  uint64_t tstart = AV_READ_TIME(); \
55 
56 #define STOP_TIMER(id) \
57  tend = AV_READ_TIME(); \
58  { \
59  static uint64_t tsum = 0; \
60  static int tcount = 0; \
61  static int tskip_count = 0; \
62  if (tcount < 2 || \
63  tend - tstart < 8 * tsum / tcount || \
64  tend - tstart < 2000) { \
65  tsum+= tend - tstart; \
66  tcount++; \
67  } else \
68  tskip_count++; \
69  if (((tcount + tskip_count) & (tcount + tskip_count - 1)) == 0) { \
70  av_log(NULL, AV_LOG_ERROR, \
71  "%"PRIu64" decicycles in %s, %d runs, %d skips\n", \
72  tsum * 10 / tcount, id, tcount, tskip_count); \
73  } \
74  }
75 #else
76 #define START_TIMER
77 #define STOP_TIMER(id) { }
78 #endif
79 
80 #endif /* AVUTIL_TIMER_H */