vpx_ports/vpx_timer.h

   1 /*
   2  *  Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10
  11
  12 #ifndef VPX_TIMER_H
  13 #define VPX_TIMER_H
  14
  15 #if defined(_WIN32)
  16 /*
  17  * Win32 specific includes
  18  */
  19 #ifndef WIN32_LEAN_AND_MEAN
  20 #define WIN32_LEAN_AND_MEAN
  21 #endif
  22 #include <windows.h>
  23 #else
  24 /*
  25  * POSIX specific includes
  26  */
  27 #include <sys/time.h>
  28
  29 /* timersub is not provided by msys at this time. */
  30 #ifndef timersub
  31 #define timersub(a, b, result) \
  32     do { \
  33         (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
  34         (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
  35         if ((result)->tv_usec < 0) { \
  36             --(result)->tv_sec; \
  37             (result)->tv_usec += 1000000; \
  38         } \
  39     } while (0)
  40 #endif
  41 #endif
  42
  43
  44 struct vpx_usec_timer
  45 {
  46 #if defined(_WIN32)
  47     LARGE_INTEGER  begin, end;
  48 #else
  49     struct timeval begin, end;
  50 #endif
  51 };
  52
  53
  54 static void
  55 vpx_usec_timer_start(struct vpx_usec_timer *t)
  56 {
  57 #if defined(_WIN32)
  58     QueryPerformanceCounter(&t->begin);
  59 #else
  60     gettimeofday(&t->begin, NULL);
  61 #endif
  62 }
  63
  64
  65 static void
  66 vpx_usec_timer_mark(struct vpx_usec_timer *t)
  67 {
  68 #if defined(_WIN32)
  69     QueryPerformanceCounter(&t->end);
  70 #else
  71     gettimeofday(&t->end, NULL);
  72 #endif
  73 }
  74
  75
  76 static long
  77 vpx_usec_timer_elapsed(struct vpx_usec_timer *t)
  78 {
  79 #if defined(_WIN32)
  80     LARGE_INTEGER freq, diff;
  81
  82     diff.QuadPart = t->end.QuadPart - t->begin.QuadPart;
  83
  84     if (QueryPerformanceFrequency(&freq) && diff.QuadPart < freq.QuadPart)
  85         return (long)(diff.QuadPart * 1000000 / freq.QuadPart);
  86
  87     return 1000000;
  88 #else
  89     struct timeval diff;
  90
  91     timersub(&t->end, &t->begin, &diff);
  92     return diff.tv_sec ? 1000000 : diff.tv_usec;
  93 #endif
  94 }
  95
  96
  97 #endif