libavutil/timer.h

   1 /**
   2  * @file libavutil/timer.h
   3  * high precision timer, useful to profile code
   4  *
   5  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
   6  *
   7  * This file is part of FFmpeg.
   8  *
   9  * FFmpeg is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * FFmpeg is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with FFmpeg; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #ifndef AVUTIL_TIMER_H
  25 #define AVUTIL_TIMER_H
  26
  27 #include <stdlib.h>
  28 #include <stdint.h>
  29 #include "config.h"
  30
  31 #if   ARCH_ARM
  32 #   include "arm/timer.h"
  33 #elif ARCH_BFIN
  34 #   include "bfin/timer.h"
  35 #elif ARCH_PPC
  36 #   include "ppc/timer.h"
  37 #elif ARCH_X86
  38 #   include "x86/timer.h"
  39 #endif
  40
  41 #if !defined(AV_READ_TIME) && HAVE_GETHRTIME
  42 #   define AV_READ_TIME gethrtime
  43 #endif
  44
  45 #ifdef AV_READ_TIME
  46 #define START_TIMER \
  47 uint64_t tend;\
  48 uint64_t tstart= AV_READ_TIME();\
  49
  50 #define STOP_TIMER(id) \
  51 tend= AV_READ_TIME();\
  52 {\
  53     static uint64_t tsum=0;\
  54     static int tcount=0;\
  55     static int tskip_count=0;\
  56     if(tcount<2 || tend - tstart < 8*tsum/tcount || tend - tstart < 2000){\
  57         tsum+= tend - tstart;\
  58         tcount++;\
  59     }else\
  60         tskip_count++;\
  61     if(((tcount+tskip_count)&(tcount+tskip_count-1))==0){\
  62         av_log(NULL, AV_LOG_ERROR, "%"PRIu64" dezicycles in %s, %d runs, %d skips\n",\
  63                tsum*10/tcount, id, tcount, tskip_count);\
  64     }\
  65 }
  66 #else
  67 #define START_TIMER
  68 #define STOP_TIMER(id) {}
  69 #endif
  70
  71 #endif /* AVUTIL_TIMER_H */