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