ffmpeg/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_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         if (tcount < 2                        ||                          \
  73             tend - tstart < 8 * tsum / tcount ||                          \
  74             tend - tstart < 2000) {                                       \
  75             tsum+= tend - tstart;                                         \
  76             tcount++;                                                     \
  77         } else                                                            \
  78             tskip_count++;                                                \
  79         if (((tcount + tskip_count) & (tcount + tskip_count - 1)) == 0) { \
  80             av_log(NULL, AV_LOG_ERROR,                                    \
  81                    "%"PRIu64" " FF_TIMER_UNITS " in %s, %d runs, %d skips\n",          \
  82                    tsum * 10 / tcount, id, tcount, tskip_count);          \
  83         }                                                                 \
  84     }
  85 #else
  86 #define START_TIMER
  87 #define STOP_TIMER(id) { }
  88 #endif
  89
  90 #endif /* AVUTIL_TIMER_H */