libavutil/timer.h

   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 */