1 /**

2 * @file

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_PPC

34 # include "ppc/timer.h"

35 #elif ARCH_X86

36 # include "x86/timer.h"

37 #endif

38

39 #if !defined(AV_READ_TIME) && HAVE_GETHRTIME

40 # define AV_READ_TIME gethrtime

41 #endif

42

43 #ifdef AV_READ_TIME

44 #define START_TIMER \

45 uint64_t tend;\

46 uint64_t tstart= AV_READ_TIME();\

47

48 #define STOP_TIMER(id) \

49 tend= AV_READ_TIME();\

50 {\

51 static uint64_t tsum=0;\

52 static int tcount=0;\

53 static int tskip_count=0;\

54 if(tcount<2 || tend - tstart < 8*tsum/tcount || tend - tstart < 2000){\

55 tsum+= tend - tstart;\

56 tcount++;\

57 }else\

58 tskip_count++;\

59 if(((tcount+tskip_count)&(tcount+tskip_count-1))==0){\

60 av_log(NULL, AV_LOG_ERROR, "%"PRIu64" dezicycles in %s, %d runs, %d skips\n",\

61 tsum*10/tcount, id, tcount, tskip_count);\

62 }\

63 }

64 #else

65 #define START_TIMER

66 #define STOP_TIMER(id) {}

67 #endif

68

69 #endif /* AVUTIL_TIMER_H */