vpx_ports/vpx_timer.h

   1 /*
   2  *  Copyright (c) 2010 The WebM 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 CONFIG_OS_SUPPORT
  16
  17 #if defined(_WIN32)
  18 /*
  19  * Win32 specific includes
  20  */
  21 #ifndef WIN32_LEAN_AND_MEAN
  22 #define WIN32_LEAN_AND_MEAN
  23 #endif
  24 #include <windows.h>
  25 #else
  26 /*
  27  * POSIX specific includes
  28  */
  29 #include <sys/time.h>
  30
  31 /* timersub is not provided by msys at this time. */
  32 #ifndef timersub
  33 #define timersub(a, b, result) \
  34     do { \
  35         (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
  36         (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
  37         if ((result)->tv_usec < 0) { \
  38             --(result)->tv_sec; \
  39             (result)->tv_usec += 1000000; \
  40         } \
  41     } while (0)
  42 #endif
  43 #endif
  44
  45
  46 struct vpx_usec_timer
  47 {
  48 #if defined(_WIN32)
  49     LARGE_INTEGER  begin, end;
  50 #else
  51     struct timeval begin, end;
  52 #endif
  53 };
  54
  55
  56 static void
  57 vpx_usec_timer_start(struct vpx_usec_timer *t)
  58 {
  59 #if defined(_WIN32)
  60     QueryPerformanceCounter(&t->begin);
  61 #else
  62     gettimeofday(&t->begin, NULL);
  63 #endif
  64 }
  65
  66
  67 static void
  68 vpx_usec_timer_mark(struct vpx_usec_timer *t)
  69 {
  70 #if defined(_WIN32)
  71     QueryPerformanceCounter(&t->end);
  72 #else
  73     gettimeofday(&t->end, NULL);
  74 #endif
  75 }
  76
  77
  78 static long
  79 vpx_usec_timer_elapsed(struct vpx_usec_timer *t)
  80 {
  81 #if defined(_WIN32)
  82     LARGE_INTEGER freq, diff;
  83
  84     diff.QuadPart = t->end.QuadPart - t->begin.QuadPart;
  85
  86     if (QueryPerformanceFrequency(&freq) && diff.QuadPart < freq.QuadPart)
  87         return (long)(diff.QuadPart * 1000000 / freq.QuadPart);
  88
  89     return 1000000;
  90 #else
  91     struct timeval diff;
  92
  93     timersub(&t->end, &t->begin, &diff);
  94     return diff.tv_sec ? 1000000 : diff.tv_usec;
  95 #endif
  96 }
  97
  98 #else /* CONFIG_OS_SUPPORT = 0*/
  99
 100 /* Empty timer functions if CONFIG_OS_SUPPORT = 0 */
 101 #ifndef timersub
 102 #define timersub(a, b, result)
 103 #endif
 104
 105 struct vpx_usec_timer
 106 {
 107     void *dummy;
 108 };
 109
 110 static void
 111 vpx_usec_timer_start(struct vpx_usec_timer *t) { }
 112
 113 static void
 114 vpx_usec_timer_mark(struct vpx_usec_timer *t) { }
 115
 116 static long
 117 vpx_usec_timer_elapsed(struct vpx_usec_timer *t) { return 0; }
 118
 119 #endif /* CONFIG_OS_SUPPORT */
 120
 121 #endif