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   1 /*
   2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; 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
  32 #include "config.h"
  33
  34 #if   ARCH_ARM
  35 #   include "arm/timer.h"
  36 #elif ARCH_BFIN
  37 #   include "bfin/timer.h"
  38 #elif ARCH_PPC
  39 #   include "ppc/timer.h"
  40 #elif ARCH_X86
  41 #   include "x86/timer.h"
  42 #endif
  43
  44 #if !defined(AV_READ_TIME) && HAVE_GETHRTIME
  45 #   define AV_READ_TIME gethrtime
  46 #endif
  47
  48 #ifdef AV_READ_TIME
  49 #define START_TIMER                             \
  50     uint64_t tend;                              \
  51     uint64_t tstart = AV_READ_TIME();           \
  52
  53 #define STOP_TIMER(id)                                                    \
  54     tend = AV_READ_TIME();                                                \
  55     {                                                                     \
  56         static uint64_t tsum   = 0;                                       \
  57         static int tcount      = 0;                                       \
  58         static int tskip_count = 0;                                       \
  59         if (tcount < 2                        ||                          \
  60             tend - tstart < 8 * tsum / tcount ||                          \
  61             tend - tstart < 2000) {                                       \
  62             tsum+= tend - tstart;                                         \
  63             tcount++;                                                     \
  64         } else                                                            \
  65             tskip_count++;                                                \
  66         if (((tcount + tskip_count) & (tcount + tskip_count - 1)) == 0) { \
  67             av_log(NULL, AV_LOG_ERROR,                                    \
  68                    "%"PRIu64" decicycles in %s, %d runs, %d skips\n",     \
  69                    tsum * 10 / tcount, id, tcount, tskip_count);          \
  70         }                                                                 \
  71     }
  72 #else
  73 #define START_TIMER
  74 #define STOP_TIMER(id) { }
  75 #endif
  76
  77 #endif /* AVUTIL_TIMER_H */