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 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 98